US20050241311A1 - Zero emissions closed rankine cycle power system - Google Patents
Zero emissions closed rankine cycle power system Download PDFInfo
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- US20050241311A1 US20050241311A1 US11/109,237 US10923705A US2005241311A1 US 20050241311 A1 US20050241311 A1 US 20050241311A1 US 10923705 A US10923705 A US 10923705A US 2005241311 A1 US2005241311 A1 US 2005241311A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/188—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using heat from a specified chemical reaction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04012—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling
- F25J3/04018—Providing pressurised feed air or process streams within or from the air fractionation unit by compression of warm gaseous streams; details of intake or interstage cooling of main feed air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04109—Arrangements of compressors and /or their drivers
- F25J3/04115—Arrangements of compressors and /or their drivers characterised by the type of prime driver, e.g. hot gas expander
- F25J3/04127—Gas turbine as the prime mechanical driver
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
- F25J3/04533—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the direct combustion of fuels in a power plant, so-called "oxyfuel combustion"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
- F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
- F25J3/04545—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
- F25J3/04612—Heat exchange integration with process streams, e.g. from the air gas consuming unit
- F25J3/04618—Heat exchange integration with process streams, e.g. from the air gas consuming unit for cooling an air stream fed to the air fractionation unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/06—Adiabatic compressor, i.e. without interstage cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/70—Steam turbine, e.g. used in a Rankine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/80—Hot exhaust gas turbine combustion engine
- F25J2240/82—Hot exhaust gas turbine combustion engine with waste heat recovery, e.g. in a combined cycle, i.e. for generating steam used in a Rankine cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
- F25J2250/40—One fluid being air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2250/00—Details related to the use of reboiler-condensers
- F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
- F25J2250/50—One fluid being oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
- F25J2260/80—Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A fuel combustion power generation system is provided operating as a closed loop Rankine cycle and with zero atmospheric emissions. The fuel is combusted with oxygen in a combustor to generate high temperature products of combustion. The products of combustion are routed to a first side of a heat exchanger. A second side of the heat exchanger has a working fluid of the closed loop Rankine cycle passed therethrough to boil the working fluid into a gas. The working fluid is then expanded, condensed back to a liquid and pumped back to high pressure for return to the heat exchanger. the products of combustion enter a condenser, where gases are collected and liquids recirculated or released. The products of combustion can be expanded upstream of the heat exchanger. The fuel can be a gaseous fuel or a solid or liquid fuel, such as coal or biomass, with gasification before combustion.
Description
- This application claims benefit under Title 35, United States Code §119(e) of U.S. Provisional Application Nos. 60/562,775, 60/562,792 and 60/562,776 filed on Apr. 16, 2004. This application also incorporates by reference the entire contents of U.S. Pat. Nos. 5,447,555; 5,611,219; 6,598,398; 5,956,937; 6,206,684; 6,637,183; and 6,868,677.
- The following invention relates to power generation systems which generate power by combustion of a fuel with an oxidizer, and expanding the products of combustion to output power. More particularly, this invention relates to power systems which utilize a majority oxygen oxidizer to combust the fuel, so that little or no pollutants are generated, and which transfer heat externally though a heat exchanger from the products of combustion to a working fluid within a closed loop Rankine cycle.
- One of the most common fuel combustion power generation systems is the closed Rankine cycle, employed in various forms is steam power plants around the world. In the closed Rankine cycle, a working fluid, most often water, is first pumped to a high pressure. The water is then heated in a boiler, where the water boils into high temperature high pressure steam. This steam is then expanded, typically in multiple stages of turbines. The turbines output power from the system. The steam is discharged from the turbine, and enters a condenser, where it is cooled back into a liquid and delivered back to the pump to repeat the cycle.
- Heretofore, fuel combustion based steam power plants have emitted pollution due to the products of combustion of the fuel being too difficult to capture or neutralize entirely, in an economic fashion, and so requiring release. Theorists have proposed that emission of pollutants could be reduced or eliminated by combusting the fuel with oxygen, rather than air (including nitrogen), and then capturing the gaseous combustion products (primarily CO2). Recently one company, Clean Energy Systems of Rancho Cordova, Calif., has demonstrated such a steam power plant.
- One common attribute of such proposed and demonstrated power plants is that the working fluid is not externally heated as with a conventional closed Rankine cycle power plant. Rather, the working fluid driving the turbine or other expander has been the actual products of combustion, with possibly water or CO2 added to the products of combustion. In gas turbine power plants operating on the Brayton cycle, such “internal” rather than “external” heating has been effective, partly due to the Brayton cycle power plants typically being configured as open cycles rather than closed cycles.
- One consideration in the configuration of a power plant is the minimization of wear on the equipment, so that maintenance can be minimized and useful life of the equipment can be maximized. One source of equipment wear is corrosion. In a conventional steam power plant, the working fluid is typically carefully filtered pure deionized water. Such water exhibits very low corrosive effects on the boiler, turbine, condenser and other parts of the steam power plant. It is desirable to maintain such a low corrosivity advantage when designing or converting a Rankine cycle power plant to operate with zero emissions, as explained above. However, the working fluid of such prior art zero emissions power plants has been a combination of CO2 and water. Such a combination readily forms carbonic acid, having a moderate level of corrosivity with most commonly employed equipment materials. Also, because the heating is “internal,” any other pollutants in the products of combustion pass through the turbine, and other equipment in the plant, enhancing the potential for increased maintenance and decreased useful life.
- Accordingly, a need exists for a zero emissions power generation system which employs the closed Rankine cycle, and yet maintains the benefits associated with external heating and keeping the working fluid pure water.
- With this invention, a zero emissions fuel combustion power plant is provided which employs the closed Rankine cycle with a working fluid that is externally heated and kept separate from the products of combustion. The power generation system includes a source of oxygen and a source of fuel, both located upstream from a combustor. The combustor receives the oxygen and fuel and combusts them into products of combustion, typically including steam and CO2. These products of combustion are not routed through the steam turbine of the closed Rankine cycle. Rather, they are passed through a high temperature side of a heat exchanger. A low temperature side of the heat exchanger has the working fluid of the closed Rankine cycle passing therethrough. The working fluid is thus kept separate from the products of combustion and is externally heated. This working fluid (typically deionized water) can remain pure, and pass on to the turbine or other expander for power generation, before condensation and pumping back to the heat exchanger. In essence, the heat exchanger takes the place of a boiler in a conventional closed Rankine cycle power generation system.
- The products of combustion can be discharged to the atmosphere, if environmental conditions allow, with substantially only steam and CO2 being released. Most preferably, however, the products of combustion are routed to a condenser where the steam condenses to water and the CO2 remains a gas. A gas outlet removes primarily CO2 from the condenser. A liquid outlet removes primarily liquid water from the condenser. The CO2 has now been captured and can be sold as an industrial gas or sequestered away from the atmosphere, such as in a terrestrial formation.
- The water can be discharged, or beneficially used outside the power generation system. Most preferably, however, a portion of the water is routed back to the combustor to regulate a temperature of the products of combustion. This water can be preheated with heat from the products of combustion, to boil the water into steam prior to injection into the combustor.
- In enhanced embodiments of the invention, a gas turbine can be provided to expand the products of combustion before passing into the heat exchanger, such that additional power is generated, or power is provided to help power an air separation unit to generate oxygen for the system. Also, the system can flexibly be designed to utilize solid fuels, such as coal or biomass, by the addition of a gasifier upstream of the combustor. In one form of the invention, the CO2 is pressurized and delivered into a natural gas fissure. A natural gas supply well tapping into the same fissure can then draw out natural gas (and some CO2) and utilize this natural gas as the fuel for the combustor of this system, with the CO2 remaining in the system or in the fissure throughout.
- Accordingly, a primary object of the present invention is to provide power from combustion with little or no emission of pollutants, including CO2.
- Another object of the present invention is to provide a zero emissions power generation system which uses the well known closed Rankine cycle, for reliability and ease of construction and operation.
- Another object of the present invention is to provide a zero emissions power generation system which heats a working fluid “externally” without contact with the products of combustion.
- Another object of the present invention is to provide a zero emissions power generation system which can be used to retrofit an existing steam power plant with minimal modification of the power plant required.
- These and other objects will be made more evident by a careful reading of the preferred embodiments described below, as well as the related drawings and the claims.
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FIG. 1 is a schematic illustrating the flow of reactants and products flowing through the system and the various components which function together to form one system according to a first illustrated embodiment of this invention, with the system particularly configured in the form of a zero emissions coal or biomass fueled power plant with external heating of a working fluid contained within a closed Rankine cycle. -
FIG. 2 is a schematic illustrating the flow of reactants and products flowing through the system and the various components which function together to form one system according to a second illustrated embodiment of this invention, with the system particularly configured as a zero emissions high efficiency power plant with external heating of a working fluid contained within a closed Rankine cycle and a gas turbine for expanding the products of combustion in a second at least partially open Rankine cycle utilizing internal heating. -
FIG. 3 is a schematic illustrating the flow of reactants and products flowing through the system and the various components which function together to form one system according to a third illustrated embodiment of this invention, with the system particularly configured as a zero emissions power plant with CO2 in the products of combustion used for enhanced natural gas recovery and sequestered away from the atmosphere. - Referring to the drawings, wherein like reference numerals represent like parts throughout the various drawing figures,
reference numerals 10, 210 and 410 (FIGS. 1, 2 and 3, respectively) are directed to variations on a zero emissions power generation system according to this invention. The fuel is combusted with a majority oxygen oxidizer, so that products of combustion, typically steam and CO2, result in volumes that can be readily separated and handled without atmospheric release. - In essence, and with particular reference to
FIG. 1 , a basic form of this invention is described. WhileFIG. 1 particularly discloses a coal fueled power plant, a most basic form of this invention would operate on a fuel that is ready to combust without requiring gasification. Thus in such a most basic system thegasifier 30 andgas cleanup 36 ofFIG. 1 would be replaced with a source of fuel, such as gaseous methane (“natural gas”). Also, a most basic form of this invention could receive oxygen from a source other than the air separation unit (ASU) 20. - In such a most basic form of the invention, the fuel and oxygen are entered into a combustor, such as the
gas generator 40, where they are combusted into products of combustion (typically steam and CO2 where the fuel is natural gas). Preferably, water is also entered into the combustor, such as in the form of at least one of thewater inlets 46. A mixture of steam and CO2 is discharged from the combustor, and passes into a heat exchanger. The heat exchanger 50 (also called a “heat recovery steam generator” or “HRSG”) transfers heat from the products of combustion to a working fluid (typically water) within a closed loop Rankine cycle. The products of combustion can then be further handled in various different ways, according to various alternative embodiments of this invention. Theheat exchanger 50 causes the working fluid to be heated into a gaseous phase. The working fluid then passes through at least one expander, and preferably a series ofturbines generator 90. The working fluid is then condensed within acondenser 100 and returned to the heat exchanger by way of apump 108 to repeat the Rankine cycle. - More specifically, and with particular reference to
FIG. 1 , details of a first specific embodiment of the power generation system of this invention are described. This embodiment is unique from the other embodiments in that it is customized to utilize coal, biomass or other carbon containing fuel which is first gasified into a syngas before combustion occurs. - One basic principle on which this power generation system is based, is that the fuel is combusted with oxygen, or at a minimum, an oxygen enriched oxidizer having a greater amount of oxygen than an amount of oxygen present in the air. With oxygen as the oxidizer, NOx formation is precluded. The power generation system 10 is depicted in
FIG. 1 in schematic form. Anair separation unit 20 is provided to separate oxygen from the air. Air enters theair separation unit 20 alongair inlet 22. Oxygen exits theair separation unit 20 throughoxygen outlet 24. - The
air separation unit 20 can be any suitable device for separation of oxygen from the air. For instance, theair separation unit 20 could be based on air liquefaction technology or based on membrane separation technology. Particular details of such air separation technology is described in U.S. Pat. No. 6,598,398, incorporated herein by reference. - The
oxygen outlet 24 preferably discharges gaseous oxygen, but could optionally discharge liquid oxygen. For this coal fired power generation system, theoxygen outlet 24 feeds two separate lines including agasifier line 26 and agas generator line 28. Thegas fire line 26 leads to agasifier 30. Thegasifier 30 is provided to convert coal into syngas (i.e. carbon monoxide and hydrogen, or other syngas compositions). Thegasifier 30 utilizes known gasifier technology to convert the coal into the syngas. The gasifier thus includes acoal inlet 32 and asyngas outlet 34. If required, thegasifier 30 can additionally include a water inlet or water can enter the gasifier along with the coal. One source of such water would be theexcess water 130 which would otherwise be discharged from the power generation system 10. - The
syngas outlet 34 of thegasifier 30 leads to agas cleanup station 36 where any impurities contained within the coal (i.e. sulfur) would be removed from the syngas. Clean syngas would then be discharged through theclean syngas line 38 to be passed on to thegas generator 40. - The
gas generator 40 has anoxygen inlet 42 for the oxygen from theair separation unit 20 and asyngas inlet 44 for the syngas fromgasifier 30. Thegas generator 40 also preferably includeswater inlets 46. The oxygen and syngas are combusted together within thegas generator 40 to produce high temperature high pressure combustion products including steam and carbon dioxide. Water from thewater inlets 46 regulates the temperature of this combustion reaction and adds additional water/steam to the combustion products exiting thegas generator 40 at thedischarge 48. Particular details of thegas generator 40 are described further in U.S. Pat. Nos. 5,956,937 and 6,206,6874, each incorporated herein by reference. - The combustion products, including steam and carbon dioxide, exit the
gas generator 40 through thedischarge 48 and then enter the heatrecovery steam generator 50 at thecombustion products inlet 52. The heatrecovery steam generator 50 is a two path heat exchanger to transfer heat from the hot combustion products to water/steam in a separate line passing through the heatrecovery steam generator 50. While the combustion products could be directly passed through a turbine or other expander for power generation, in the preferred embodiment depicted herein the water/steam that drives turbines in this power generation system 10 is isolated within the heatrecovery steam generator 50, so that purified water is recirculated through theturbines - The heat
recovery steam generator 50 includes acombustion products outlet 54 in communication with thecombustion products inlet 52. The heatrecovery steam generator 50 also includes awater inlet 56 coupled to asteam outlet 58. A water/steam pathway between thewater inlet 56 and thesteam outlet 58 is in heat transfer relationship with a combustion products pathway between thecombustion products inlet 52 and thecombustion products outlet 54. In many ways the heatrecovery steam generator 50 can be analogized to a boiler within a typical prior art steam power plant. Further portions of this power generation system 10 downstream from thecombustion products outlet 54 are described below. - The water entering the
water inlet 56 of the heatrecovery steam generator 50 is turned into steam before it reaches thesteam outlet 58 of the heatrecovery steam generator 50. This steam is then passed to thesteam feed line 62 of the high pressure turbine 60. The high pressure turbine 60 provides a preferred form of expander for the steam generated within the heatrecovery steam generator 50. The high pressure turbine 60 is coupled to a shaft 64 which is preferably also coupled to anintermediate pressure turbine 70, alow pressure turbine 80 and anelectric generator 90. - The steam in the
steam feed line 62 passes through the high pressure turbine 60, then through thehigh pressure discharge 66 to theintermediate pressure turbine 70. The steam then passes along theintermediate pressure discharge 72 to thelow pressure turbine 80 and on to thelow pressure discharge 82. While threeturbines generator 90. - The
multiple turbines - The steam exiting the
low pressure turbine 80 through thelow pressure discharge 82 is passed to thecondenser 100. Thecondenser 100 converts the low pressure and low temperature steam from a gaseous phase to a liquid phase. Thecondenser 100 would be similar to any typical prior art condenser for a steam power plant. For instance, a lowpressure steam inlet 102 would direct the steam into thecondenser 100. A coolingwater circuit 104 would pass through thecondenser 100 to cool the steam therein. Awater outlet 106 would be provided at the bottom of thecondenser 100 for pure liquid water working fluid to be discharged from thecondenser 100. Afeed water pump 108 is provided downstream from thewater outlet 106 to repressurize the water before the water passes back to thewater inlet 56 of the heatrecovery steam generator 50 and on to theturbines - While this steam power generation loop including the heat
recovery steam generator 50,turbines condenser 100 and pump 108 is preferably in the form depicted herein, any Rankine cycle steam power generation system (or other working fluid Rankine cycle) could alternatively be utilized. Particularly, any suitable Rankine power generation system could initially be selected and then the boiler from that system replaced with the heatrecovery steam generator 50 of the power generation system 10 of this invention. The Rankine cycle power generation system would then operate according to its design. - With further reference to
FIG. 1 , particular details of the handling of the combustion products after they are discharged from thecombustion products outlet 54 of the heatrecovery steam generator 50 are described in detail. While these combustion products, including steam and carbon dioxide, could be exhausted directly to the atmosphere, multiple benefits are provided by further processing these combustion products. Particularly, the carbon dioxide within the combustion products can be separated from the steam within the combustion products. The steam can then be recirculated to the gas generator or otherwise be beneficially utilized. The carbon dioxide which has then been isolated can similarly be utilized in a productive fashion, such as selling the carbon dioxide as an industrial gas or utilizing the carbon dioxide for enhanced oil recovery, enhanced gas recovery, or merely for sequestration in a location other than the atmosphere. - In the preferred embodiment of this power system 10, the combustion products exiting the heat
recovery steam generator 54 are passed to afeed water heater 110 before being delivered to a separator 120. Thefeed water heater 110 includes acombustion products entrance 112 which receives the combustion products from the heatrecovery steam generator 50. A combustion products exit 114 removes the combustion products out of thefeed water heater 110. Thefeed water heater 110 also includes awater entrance 116 and awater exit 118. - Water passing between the
water entrance 116 andwater exit 118 would be heated by excess heat within the combustion products exiting the heatrecovery steam generator 50. This heated water can then beneficially be delivered to the gas generator through thewater inlet 46. The combustion products leaving thefeed water heater 110 through the combustion products exit 114 are further cooled by theheater 110, preferably to a temperature near where the water within the combustion products is ready to condense into a liquid. - The separator 120 includes a
combustion products entry 122 which receives the combustion products from thefeed water heater 110. A coolingwater circuit 124 provides cooling within the separator 120 in a fashion similar to that of a typical condenser within a steam power plant. While the coolant is preferably water, other coolants could be utilized for the separator 120 (as well as for the condenser 100). - The separator 120 includes a
carbon dioxide discharge 126 which removes gaseous portions of the combustion products from the separator 120. Awater discharge 128 removes liquid portions of the combustion products, including substantially entirely water. This water exiting the separator 120 of thewater discharge 128 is beneficially fed to thefeed water heater 110 at thewater entrance 116 for recirculation to thegas generator 40. Afeed water pump 126 would typically be provided to repressurize the water exiting the separator 120 if necessary. Anexcess water outlet 130 is also located adjacent thewater discharge 128. - This system does not particularly show any expander for the combustion products between the
gas generator 40 and thefeed water pump 129. At a minimum, pressure losses within the pipes between thegas generator 40 and thefeed water pump 129 could be made up by thefeed water pump 129 itself to maintain flow rates desired for the system. If thefeed water heater 110 and/or separator 120 would benefit from handling lower pressure combustion products passing therethrough, some form of expansion valve could be provided. Such expansion would also decrease a temperature of the combustion products, and so would beneficially be located between thefeed water heater 110 and the separator 120. However, such a valve could be conceivably located anywhere between thegas generator 40 and thefeed water pump 129. Rather than merely providing an expansion valve, a turbine or other expander could be provided coupled to a generator or otherwise delivering useful power. As a primary purpose of this invention is to demonstrate the feasibility of generating electric power from combustion of coal in a zero emissions fashion, the inclusion of any such additional turbines would be optional. - While the power generation system 10 is particularly shown with the fuel being coal, other carbon containing fuel sources could similarly be utilized. For instance, biomass fuel sources could be utilized, petcoke, landfill gas, and various different carbon containing waste streams could be utilized. If a more pure fuel such as natural gas or hydrogen were to be utilized, the
gasifier 30 andgas cleanup 36 portions of this system 10 would be eliminated. Also, in the case of hydrogen, no carbon dioxide would be generated within the system. - With particular reference to
FIG. 2 , details of thepower generation system 210 of this invention are described. This embodiment is unique from the other disclosed embodiments in that it burns some form of hydrocarbon fuel, including optionally syngas, and utilizes both a gas turbine and a steam turbine with the working fluids kept separate, to generate power while exhibiting zero emissions. - One basic principle on which this
power generation system 210 is based, is that the fuel is combusted with oxygen, or at a minimum, an oxygen enriched oxidizer having a greater amount of oxygen than an amount of oxygen present in the air. With oxygen as the oxidizer, NOx formation is precluded. - Air initially enters the
system 210 through anair inlet 212. Theair inlet 212 leads to anair compressor 214 which is driven by a highpressure gas turbine 240 described in detail below. Theair compressor 214 discharges the compressed air at a high temperature and high pressure. Heat of compression is preferably removed first through a second feed water heater 2140, and second through aprecooler 216, where the air is cooled by giving heat to liquid oxygen from aliquid oxygen reservoir 227 described in detail below. Such cooling of the air before entry into theair separation unit 220 is preferred, especially when theair separation unit 220 utilizes liquefaction technology to separate oxygen from other constituents within the air. Theair separation unit 220 can be any suitable device for separation of oxygen from the air. For instance, theair separation unit 220 could be based on air liquefaction technology or based on membrane separation technology. Particular details of such air separation technology is described in U.S. Pat. No. 6,598,398, incorporated herein by reference. - The
air separation unit 220 includes anair entrance 222 receiving the air which originated at theair inlet 212. Theair separation unit 220 also includes anitrogen outlet 224 for gaseous nitrogen removed from the oxygen within the air by the air separation unit. If any residual energy exists within this stream of nitrogen at thenitrogen outlet 224, an appropriate expander can be utilized to generate additional power off of the nitrogen exiting theair separation unit 220 through thenitrogen outlet 224. Agaseous oxygen outlet 225 is preferably also provided for discharge of oxygen, or an oxygen enriched air stream from theair separation unit 220. - Alternatively, or in addition to the
gaseous oxygen outlet 225, aliquid oxygen outlet 226 can also be provided for removal of liquid oxygen from theair separation unit 220. Such aliquid oxygen outlet 226 would typically lead to aliquid oxygen reservoir 227 where oxygen could be conveniently stored, such as for start up of thepower generation system 210, or to allow thesystem 210 to be operated either with theair separation unit 220, or operated off of liquid oxygen supplied in batches, such as by tanker truck or tanker rail car delivery. Apump 228 is provided between theliquid oxygen reservoir 227 and thegas generator 230 where the oxygen is utilized. Preferably, the liquid oxygen exitingliquid oxygen reservoir 227 is passed through theprecooler 216 to precool the air before it enters theair separation unit 220 within theprecooler 216. - The
gas generator 230 has anoxygen inlet 234 for the oxygen from theair separation unit 220 or theliquid oxygen reservoir 227, and thefuel inlet 232 for the fuel. Thegas generator 230 also preferably includes at least onewater inlet 236. The oxygen and fuel are combusted together within thegas generator 230 to produce high temperature high pressure combustion products including steam and carbon dioxide. Water from thewater inlet 236 regulates the temperature of this combustion reaction and adds additional water/steam to the combustion products exiting thegas generator 230 at thedischarge 238. Particular details of one form of thegas generator 230 are described further in U.S. Pat. Nos. 5,956,937 and 6,206,684, each incorporated herein by reference. - The combustion products including steam and carbon dioxide exit the
gas generator 230 through thedischarge 238 and then are passed to one ormore gas turbines pressure gas turbine 240 is provided downstream from thedischarge 238 of thegas generator 230. Aninlet 242 receives the combustion products into the highpressure gas turbine 240. Anoutlet 244 discharges the combustion products out of the highpressure gas turbine 240. Ashaft 245 preferably couples the highpressure gas turbine 240 to theair compressor 214. With this embodiment, the highpressure gas turbine 240 provides mechanical power to directly drive theair compressor 214. Alternatively, the highpressure gas turbine 240 could be coupled to an electric power generator and theair compressor 214 could be separately powered. - The
outlet 244 transports the combustion products including steam and carbon dioxide to a lowpressure gas turbine 246 for further expanding of the steam and carbon dioxide combustion products. This lowpressure gas turbine 246 is preferably a commercially available aeroderivative gas turbine with the inlet pressure, outlet pressure, inlet temperature and outlet temperature appropriately matched for such a previously existing aeroderivative gas turbine. Thelow pressure turbine 246 is preferably coupled to agas turbine generator 247 for production of additional power. The combustion products are discharged from the lowpressure gas turbine 246 through theoutlet 248. The lowpressure gas turbine 246 could additionally be coupled by a shaft to the highpressure gas turbine 240 and/or to theair compressor 214. While a highpressure gas turbine 240 and lowpressure gas turbine 246 are shown, more than two or less than two such turbines could be utilized to expand the combustion products exiting thegas generator 230. - Preferably, the combustion products at the
outlet 248 still have sufficient temperature so that waste heat is available for producing steam within the heatrecovery steam generator 250. Theoutlet 248 is thus coupled to thecombustion products inlet 252 of the heatrecovery steam generator 250. The heatrecovery steam generator 250 is a two path heat exchanger to transfer heat from the hot combustion products to water/steam in a separate line passing through the heatrecovery steam generator 250. While the combustion products could be directly passed through a turbine or other expander for power generation, in the preferred embodiment depicted herein the water/steam that drives turbines in thispower generation system 210 is isolated within the heatrecovery steam generator 250, so that purified water is recirculated through theturbine system 210. Thissystem 210 thus simplifies the construction of this power plant and still exhibits zero emissions. - The heat
recovery steam generator 250 includes acombustion products outlet 254 in communication with thecombustion products inlet 252. The heatrecovery steam generator 250 also includes awater inlet 256 coupled to asteam outlet 258. A water/steam pathway between thewater inlet 256 and thesteam outlet 258 is in heat transfer relationship with a combustion products pathway between thecombustion products inlet 252 and thecombustion products outlet 254. In many ways, the heatrecovery steam generator 250 can be analogized to a boiler within a typical prior art steam power plant. Further portions of thispower generation system 210 downstream from thecombustion products outlet 254 are described below. - The water entering the
water inlet 256 of the heatrecovery steam generator 250 is turned into steam before it reaches thesteam outlet 258 of the heatrecovery steam generator 250. This steam is then passed to thesteam feed line 262 of thehigh pressure turbine 260. Thehigh pressure turbine 260 provides a preferred form of expander for the steam generated within the heatrecovery steam generator 250. Thehigh pressure turbine 260 is coupled to ashaft 264 which is preferably also coupled to anintermediate pressure turbine 270, alow pressure turbine 280 and anelectric generator 290. - The steam in the
steam feed line 262 passes through thehigh pressure turbine 260, then through thehigh pressure discharge 266 to theintermediate pressure turbine 270. The steam then passes along theintermediate pressure discharge 272 to thelow pressure turbine 280 and on to thelow pressure discharge 282. While threeturbines generator 290. - The
multiple turbines power generation system 210, or drive other equipment. - The steam exiting the
low pressure turbine 280 through thelow pressure discharge 282 is passed to thecondenser 300. Thecondenser 300 converts the low pressure and low temperature steam from a gaseous phase to a liquid phase. Thecondenser 300 would be similar to any typical prior art condenser for a steam power plant. For instance, a lowpressure steam inlet 302 would direct the steam into thecondenser 300. A coolingwater circuit 304 would pass through thecondenser 300 to cool the steam therein. Awater outlet 306 would be provided at the bottom of thecondenser 300 for pure liquid water working fluid to be discharged from thecondenser 300. Afeed water pump 308 is provided downstream from thewater outlet 306 to repressurize the water before the water passes back to thewater inlet 256 of the heatrecovery steam generator 250 and on to theturbines - While this steam power generation loop including the heat
recovery steam generator 250,turbines condenser 300 and pump 308 is preferably in the form depicted herein, any Rankine cycle steam power generation system (or other working fluid Rankine cycle) could alternatively be utilized. Particularly, any suitable Rankine power generation system could initially be selected and then the boiler from that system replaced with the heatrecovery steam generator 250 of thepower generation system 210 of this invention. The Rankine cycle power generation system would then operate according to its design. - With further reference to
FIG. 2 , particular details of the handling of the combustion products after they are discharged from thecombustion products outlet 254 of the heatrecovery steam generator 250 are described in detail. While these combustion products, including steam and carbon dioxide, could be exhausted directly to the atmosphere, multiple benefits are provided by further processing these combustion products. Particularly, the carbon dioxide within the combustion products can be separated from the steam within the combustion products. The steam can then be recirculated to the gas generator or otherwise be beneficially utilized. The carbon dioxide which has then been isolated can similarly be utilized in a productive fashion, such as selling the carbon dioxide as an industrial gas or utilizing the carbon dioxide for enhanced oil recovery, enhanced gas recovery, or merely for sequestration in a location other than the atmosphere. - In the preferred embodiment of this
power system 210, the combustion products exiting the heatrecovery steam generator 254 are passed to afeed water heater 310 before being delivered to aseparator 320. Thefeed water heater 310 includes acombustion products entrance 312 which receives the combustion products from the heatrecovery steam generator 250. A combustion products exit 314 removes the combustion products out of thefeed water heater 310. Thefeed water heater 310 also includes awater entrance 316 and awater exit 318. - Water passing between the
water entrance 316 andwater exit 318 would be heated by excess heat within the combustion products exiting the heatrecovery steam generator 250. This heated water can then beneficially be delivered to the gas generator through thewater inlet 246. The combustion products leaving thefeed water heater 310 through the combustion products exit 314 are further cooled by theheater 310, preferably to a temperature near where the water within the combustion products is ready to condense into a liquid. - The
separator 320 includes acombustion products entry 322 which receives the combustion products from thefeed water heater 310. A coolingwater circuit 324 provides cooling within theseparator 320 in a fashion similar to that of a typical condenser within a steam power plant. While the coolant is preferably water, other coolants could be utilized for the separator 320 (as well as for the condenser 300). - The
separator 320 includes acarbon dioxide discharge 326 which removes gaseous portions of the combustion products from theseparator 320. A water discharge 328 removes liquid portions of the combustion products, including substantially entirely water. This water exiting theseparator 320 of the water discharge 328 is beneficially fed to thefeed water heater 310 at thewater entrance 316 for recirculation to thegas generator 230. Afeed water pump 326 would typically be provided to repressurize the water exiting theseparator 320 if necessary. Anexcess water outlet 330 is also located adjacent the water discharge 328. - While the water could be recirculated directly to the
gas generator 230, most preferably the water is first routed to a second feed water heater 340. The water can thus be additionally preheated with heat of compression in the air discharged from theair compressor 214, before the preheated water is passed on to thewater inlet 236 of thegas generator 230. - With particular reference to
FIG. 3 , details of thepower generation system 410 of this invention are described. This embodiment is unique from the other embodiments of this invention in that it contemplates utilizing excess CO2 to enhance recovery of natural gas, and then potentially using the natural gas recovered to power the system. As with the previous embodiments, a basic principle on which thispower generation system 410 is based, is that the fuel is combusted with oxygen, or at a minimum, an oxygen enriched oxidizer having a greater amount of oxygen than an amount of oxygen present in the air. With oxygen as the oxidizer, NOx formation is precluded. - Air initially enters the
system 410 through anair inlet 412. Aprecooler 416 is optionally provided where the air is cooled by giving heat to liquid oxygen from aliquid oxygen reservoir 427 described in detail below. Such cooling of the air before entry into theair separation unit 420 is preferred, especially when theair separation unit 420 utilizes liquefaction technology to separate oxygen from other constituents within the air. Theair separation unit 420 can be any suitable device for separation of oxygen from the air. For instance, theair separation unit 420 could be based on air liquefaction technology or based on membrane separation technology. Particularly details of such air separation technology is described in U.S. Pat. No. 6,598,398, incorporated herein by reference. - The
air separation unit 420 includes anair entrance 422 receiving the air which originated at theair inlet 412. Theair separation unit 420 also includes anitrogen outlet 424 for gaseous nitrogen removed from the oxygen within the air by the air separation unit. If any residual energy exists within this stream of nitrogen at thenitrogen outlet 424, an appropriate expander can be utilized to generate additional power off of the nitrogen exiting theair separation unit 420 through thenitrogen outlet 424. Agaseous oxygen outlet 425 is preferably also provided for discharge of oxygen, or an oxygen enriched air stream from the air separation unit. - Alternatively, or in addition to the
gaseous oxygen outlet 425, aliquid oxygen outlet 426 can also be provided for removal of liquid oxygen from theair separation unit 420. Such aliquid oxygen outlet 426 would typically lead to aliquid oxygen reservoir 427 where oxygen could be conveniently stored, such as for start up of thepower generation system 410, or to allow the system to be operated either with theair separation unit 420, or operated off of liquid oxygen supplied, such as by tanker truck or tanker rail car delivery. Apump 428 is provided between theliquid oxygen reservoir 427 and thegas generator 430 where the oxygen is utilized. Preferably, the liquid oxygen exitingliquid oxygen reservoir 427 is passed through theprecooler 416 to precool the air before it enters theair separation unit 420. - The
gas generator 430 has anoxygen inlet 434 for the oxygen from theair separation unit 420 or theliquid oxygen reservoir 427, and afuel inlet 432 for the fuel. Thegas generator 430 also preferably includes at least onewater inlet 436. The oxygen and fuel are combusted together within thegas generator 430 to produce high temperature high pressure combustion products including steam and carbon dioxide. Water from thewater inlet 436 regulates the temperature of this combustion reaction and adds additional water/steam to the combustion products exiting thegas generator 430 at thedischarge 438. Particular details of thegas generator 430 are described further in U.S. Pat. Nos. 5,956,937 and 6,206,684, each incorporated herein by reference. - The combustion products including steam and carbon dioxide exit the
gas generator 430 through thedischarge 438. Optionally, the products of combustion can then be passed to one or more gas turbines for expansion of the high temperature high pressure combustion products including steam and carbon dioxide. - The combustion products have sufficient temperature so that heat is available for producing steam within the heat
recovery steam generator 450. Thedischarge 438 is thus upstream from acombustion products inlet 452 of the heatrecovery steam generator 450. - The heat
recovery steam generator 450 is a two path heat exchanger to transfer heat from the hot combustion products to water/steam in a separate line passing through the heatrecovery steam generator 450. While the combustion products could be directly passed through a turbine or other expander for power generation, in the preferred embodiment depicted herein the water/steam that drives turbines in thispower generation system 410 is isolated within the heatrecovery steam generator 450, so that purified water is recirculated through theturbine system 410. Thissystem 410 thus simplifies the construction of this power plant and still exhibits zero emissions. - The heat
recovery steam generator 450 includes acombustion products outlet 454 in communication with thecombustion products inlet 452. The heatrecovery steam generator 450 also includes awater inlet 456 coupled to asteam outlet 458. A water/steam pathway between thewater inlet 456 and thesteam outlet 458 is in heat transfer relationship with a combustion products pathway between thecombustion products inlet 452 and thecombustion products outlet 454. In many ways, the heatrecovery steam generator 450 can be analogized to a boiler within a typical prior art steam power plant. Further portions of thispower generation system 410 downstream from thecombustion products outlet 454 are described below. - The water entering the
water inlet 456 of the heatrecovery steam generator 450 is turned into steam before it reaches thesteam outlet 458 of the heatrecovery steam generator 450. This steam is then passed to thesteam feed line 462 of thehigh pressure turbine 460. Thehigh pressure turbine 460 provides a preferred form of expander for the steam generated within the heatrecovery steam generator 450. Thehigh pressure turbine 460 is coupled to ashaft 464 which is preferably also coupled to anintermediate pressure turbine 470, alow pressure turbine 480 and anelectric generator 490. - The steam in the
steam feed line 462 passes through thehigh pressure turbine 460, then through thehigh pressure discharge 466 to theintermediate pressure turbine 470. The steam then passes along theintermediate pressure discharge 472 to thelow pressure turbine 480 and on to thelow pressure discharge 482. While threeturbines generator 490. - The
multiple turbines power generation system 410, or drive other equipment. - The steam exiting the
low pressure turbine 480 through thelow pressure discharge 482 is passed to thecondenser 500. Thecondenser 500 converts the low pressure and low temperature steam from a gaseous phase to a liquid phase. Thecondenser 500 would be similar to any typical prior art condenser for a steam power plant. For instance, a lowpressure steam inlet 502 would direct the steam into thecondenser 500. A coolingwater circuit 504 would pass through thecondenser 500 to cool the steam therein. Awater outlet 506 would be provided at the bottom of thecondenser 500 for pure liquid water working fluid to be discharged from thecondenser 500. Afeed water pump 508 is provided downstream from thewater outlet 506 to repressurize the water before the water passes back to thewater inlet 456 of the heatrecovery steam generator 450 and on to theturbines - While this steam power generation loop including the heat
recovery steam generator 450,turbines condenser 500 and pump 508 is preferably in the form depicted herein, any Rankine cycle steam power generation system (or other working fluid Rankine cycle) could alternatively be utilized. Particularly, any suitable Rankine power generation system could initially be selected and then the boiler from that system replaced with the heatrecovery steam generator 450 of thepower generation system 410 of this invention. The Rankine cycle power generation system would then operate according to its design. - With further reference to
FIG. 1 , particular details of the handling of the combustion products after they are discharged from thecombustion products outlet 454 of the heatrecovery steam generator 450 are described in detail. While these combustion products, including steam and carbon dioxide, could be exhausted directly to the atmosphere, multiple benefits are provided by further processing these combustion products. Particularly, the carbon dioxide within the combustion products can be separated from the steam within the combustion products. The steam can then be recirculated to thegas generator 430 or otherwise be beneficially utilized. The carbon dioxide which has then been isolated can similarly be utilized in a productive fashion, such as selling the carbon dioxide as an industrial gas or utilizing the carbon dioxide for enhanced oil recovery, enhanced gas recovery, or merely for sequestration in a location other than the atmosphere. - In the preferred embodiment of this
power system 410, the combustion products exiting the heatrecovery steam generator 454 are passed to afeed water heater 510 before being delivered to aseparator 520. Thefeed water heater 510 includes acombustion products entrance 512 which receives the combustion products from the heatrecovery steam generator 450. A combustion products exit 514 removes the combustion products out of thefeed water heater 510. Thefeed water heater 510 also includes awater entrance 516 and awater exit 518. - Water passing between the
water entrance 516 andwater exit 518 would be heated by excess heat within the combustion products exiting the heatrecovery steam generator 450. This heated water can then beneficially be delivered to thegas generator 430 through thewater inlet 436. The combustion products leaving thefeed water heater 510 through the combustion products exit 514 are further cooled by theheater 510, preferably to a temperature near where the water within the combustion products is ready to condense into a liquid. - The
separator 520 includes acombustion products entry 522 which receives the combustion products from thefeed water heater 510. A coolingwater circuit 524 provides cooling within theseparator 520 in a fashion similar to that of a typical condenser within a steam power plant. While the coolant is preferably water, other coolants could be utilized for the separator 520 (as well as for the condenser 500). - The
separator 520 includes acarbon dioxide discharge 526 which removes gaseous portions of the combustion products from theseparator 520. Awater discharge 528 removes liquid portions of the combustion products, including substantially entirely water. This water exiting theseparator 520 of thewater discharge 528 is beneficially fed to thefeed water heater 510 at thewater entrance 516 for recirculation to thegas generator 430. Afeed water pump 529 would typically be provided to repressurize the water exiting theseparator 520 if necessary. An excess water outlet 530 is also located adjacent thewater discharge 528. The excess water can also feed a make-upwaterline 532 for the closed loop Rankine cycle. - With the
system 410 of this invention the carbon dioxide discharged from theseparator 520 alongCO2 discharge 526 is beneficially utilized to enhance recovery of gas from anatural gas reservoir 550. In a most preferred form of this invention, this extra natural gas produced is then used within thegas generator 430 as the fuel combusted therein, so that the discharged carbon dioxide and the inputted fuel into the system form their own closed loop. - Specifically, the CO2 from the
CO2 discharge 526 is directed to a CO2 injection well 540. The CO2 would typically require pressurization before injection into the CO2 injection well 540. Such pressurization would typically involve multiple stages of compression and intercooling, with the intercooling stages typically drying the CO2 and removing any water vapor which might have left theseparator 520 along with the carbon dioxide. In this way, most beneficially substantially pure CO2 is directed into the CO2 injection well 540. However, any impurities would beneficially be sequestered along with the CO2. - The CO2 is sufficiently pressurized so that the CO2 can be placed entirely down into the
natural gas reservoir 550 through the CO2 injection well 540. While thereservoir 550 is preferably a reservoir of natural gas, the reservoir could be a reservoir of other gases which are suitable as fuels, including enhanced oil recovery, or could be utilized to remove other gases or liquids which are contained within subterranean reservoirs. The high pressure CO2 both repressurizes thenatural gas reservoir 550 and also can have an affect on the ability of the natural gas or other compounds within the reservoir to separate from other structures within the reservoir so that the natural gas or other compounds within the reservoir are more easily removed from thereservoir 550. - Particularly, a natural
gas production well 560 is utilized to pump natural gas out of thenatural gas reservoir 550. The natural gas production well 560 would typically initially receive an enhanced amount of natural gas therefrom, due to repressurizing the natural gas reservoir with the carbon dioxide. Note that because carbon dioxide is a heavier compound than methane, which makes up the primary component of natural gas, the methane would tend to rise within thenatural gas reservoir 550 with the carbon dioxide tending to pool within thereservoir 550, so that enhanced production of natural gas out of the natural gas production well 560 would result. - Over time, typically a greater and greater percentage of carbon dioxide would be included in the natural gas removed from the natural
gas production well 560. If needed, such carbon dioxide could be removed from the natural gas for beneficial industrial use, or for resequestration. Most preferably, however, the combined natural gas and carbon dioxide from the natural gas production well 560 would be directed back to thefuel inlet 432 of thegas generator 430, typically through some intermediate fuel storage tank. - When the
system 410 of this invention initially commences operation, the fuel would be primarily the methane within the natural gas. Over time, an amount of carbon dioxide within the natural gas would increase. The percentage of carbon dioxide within the fuel entering thegas generator 430 through thefuel inlet 432 could be monitored, such that the appropriate amount of oxygen is adjusted to maintain substantially stoichiometric combustion within thegas generator 430. - The carbon dioxide entering the
gas generator 430 along with the methane would pass through thegas generator 430 and mix with the products of combustion within thegas generator 430 and released from thegas generator 430 at thedischarge 438. Because the products of combustion within thegas generator 430 are steam and carbon dioxide, having additional carbon dioxide within the fuel would not add an additional constituent to the products of combustion within thegas generator 430. Rather, the only effect would be that a ratio of steam to carbon dioxide would be slightly altered as the amount of carbon dioxide within the fuel increases. - At some point, the amount of carbon dioxide within the natural gas produced from the natural gas production well 560 would be sufficiently high that no further practical energy can be removed from the
natural gas reservoir 550. The natural gas production well 560 would then typically be capped, with the carbon dioxide remaining within thenatural gas reservoir 550 for effective sequestration out of the atmosphere. The power generation system would be configured to be mobile in one embodiment, such asystem 410 could move betweennatural gas reservoirs 550 after depletion of thenatural gas reservoir 550 so that operation of thesystem 410 could be repeated at separate locations. - This disclosure is provided to reveal a preferred embodiment of the invention and a best mode for practicing the invention. Having thus described the invention in this way, it should be apparent that various different modifications can be made to the preferred embodiment without departing from the scope and spirit of this invention disclosure. When structures are identified as a means to perform a function, the identification is intended to include all structures which can perform the function specified. When structures of this invention are identified as being coupled together, such language should be interpreted broadly to include the structures being coupled directly together or coupled together through intervening structures. Such coupling could be permanent or temporary and either in a rigid fashion or in a fashion which allows pivoting, sliding or other relative motion while still providing some form of attachment, unless specifically restricted.
Claims (56)
1- A zero emissions closed Rankine cycle power generation system, comprising in combination:
a closed Rankine cycle working fluid recirculation loop including a working fluid heater, a working fluid expander, a working fluid condenser and a working fluid pump;
a source of oxidizer, the oxidizer being a majority oxygen;
a source of fuel, the fuel being capable of combustion with oxygen to produce elevated temperature products of combustion;
a combustor having an oxidizer inlet downstream from said source of oxidizer, a fuel inlet downstream from said source of fuel, said combustor adapted to combust the fuel with the oxygen to produce elevated temperature products of combustion, and an outlet adapted to discharge the elevated temperature products of combustion from the combustor; and
a heat exchanger downstream from said combustor outlet, said heat exchanger adapted to transfer heat from said elevated temperature products of combustion to the working fluid of said closed Rankine cycle as at least a portion of said working fluid heater.
2- The system of claim 1 wherein said source of fuel includes the element hydrogen.
3- The system of claim 1 wherein said source of fuel includes the element carbon.
4- The system of claim 3 wherein said source of fuel includes the element hydrogen, such that said source of fuel is a source of hydrocarbon fuel.
5- The system of claim 4 wherein said source of fuel includes methane.
6- The system of claim 4 wherein said source of fuel includes syngas comprising hydrogen gas and carbon monoxide gas.
7- The system of claim 6 wherein said source of fuel includes a gasifier, said gasifier including an inlet for a carbon containing feedstock, and an inlet for oxygen from said source of oxidizer, said gasifier adapted to convert the carbon containing feedstock into syngas, said oxidizer including an outlet for syngas, said outlet upstream of said combustor fuel inlet.
8- The system of claim 7 wherein said carbon containing feedstock includes coal.
9- The system of claim 7 wherein said carbon containing feedstock includes biomass.
10- The system of claim 1 wherein said combustor includes a water inlet, said combustor adapted to combine water from said water inlet with the elevated temperature products of combustion before discharge from said combustor from said outlet.
11- The system of claim 10 wherein said source of fuel includes hydrogen, such that at least one of the elevated temperature products of combustion is water, and wherein the water produced within said combustor is at least partially routed to said water inlet, such that the water entering said combustor at said water inlet is at least partially water produced within said combustor previously.
12- The system of claim 11 wherein a condenser is located downstream of said outlet of said combustor, said condenser adapted to condense water within the products of combustion from steam to liquid water, said condenser including a liquid water outlet oriented upstream from said water inlet of said combustor; and a water preheater located between said liquid water outlet of said condenser and said water inlet of said combustor, said water preheater adapted to transfer heat from the products of combustion between said outlet of said combustor and said condenser to the water passing from said condenser to said combustor.
13- The system of claim 12 wherein said water preheater is adapted to heat the water therein sufficiently to boil the water from liquid water into steam, and wherein the water at said water inlet is steam.
14- The system of claim 13 wherein said oxygen from said source of oxidizer is in a gaseous phase.
15- The system of claim 14 wherein said oxygen from said source of oxidizer is substantially free of water until said oxygen enters said combustor.
16- The system of claim 1 wherein said source of oxidizer includes an air separator, said air separator including an inlet for air and an outlet for oxidizer which is a majority oxygen, said air separator adapted to separate at least a portion of oxygen in the air from nitrogen in the air.
17- The system of claim 16 wherein said air separator is adapted to cool the air to a temperature at which at least the nitrogen condenses into a liquid, to facilitate separation of the oxygen from the nitrogen.
18- The system of claim 16 wherein said air separator includes at least one ion transfer membrane adapted to separate oxygen from nitrogen in the air.
19- The system of claim 1 wherein an expander is located downstream of said outlet of said combustor, said expander adapted to expand flow discharged from said combustor, said expander including a discharge.
20- The system of claim 19 wherein said expander is adapted to output power from the system.
21- The system of claim 20 wherein said expander includes at least one turbine.
22- The system of claim 21 wherein said expander includes a non-condensing gas turbine.
23- The system of claim 21 wherein said turbine is integrated with said air separator by providing an air compressor downstream of said air inlet of said air separator and driving said air compressor with said turbine, such that an efficiency with which oxygen is separated from nitrogen in the air is enhanced.
24- The system of claim 19 wherein said expander is located upstream of said heat exchanger.
25- The system of claim 1 wherein the working fluid of said closed Rankine cycle recirculating loop is water.
26- The system of claim 1 wherein the fuel from said source of fuel at least partially includes the element carbon, the combustor adapted to combust the carbon containing fuel into products of combustion including CO2, the system including a separator for the products of combustion, said separator including an outlet for primarily CO2.
27- The system of claim 26 wherein said products of combustion include both CO2 and water, said separator including a condenser for the water, and said outlet for primarily CO2 being an outlet for gases not condensing within the condenser.
28- The system of claim 26 wherein said outlet for primarily CO2 includes at least one pump to pressurize the CO2 to a pressure at least as great as a pressure within a terrestrial formation, and wherein said outlet for primarily CO2 is coupled to a feed well adapted to deliver the CO2 into the terrestrial formation.
29- The system of claim 27 wherein said terrestrial formation includes a natural gas pocket.
30- The system of claim 29 wherein said source of fuel includes natural gas from said natural gas pocket to which said outlet for primarily CO2 is coupled.
31- The system of claim 1 wherein said source of fuel includes both natural gas and CO2, at least a portion of the CO2 in said source of fuel being CO2 formed as a product of combustion of the natural gas with oxygen within said combustor.
32- A zero emissions coal or biomass power generation system with external heating of a working fluid, comprising in combination:
an air separation unit including an air inlet and an outlet for oxygen enriched air;
a gasifier including an oxygen inlet coupled to said oxygen enriched air outlet of said air separation unit, a carbon containing feedstock inlet and a syngas outlet;
a gas generator including an oxygen inlet downstream from said oxygen enriched air outlet of said air separation unit, a syngas inlet downstream from said syngas outlet of said gasifier, and a water inlet, said gas generator adapted to combust the oxygen from the oxygen inlet with syngas from the syngas inlet to produce products of combustion including steam and carbon dioxide, said gas generator adapted to mix water from the water inlet with the combustion products to produce a combined stream of carbon dioxide and steam; and
a closed loop Rankine cycle steam power generation system including a boiler and an expander, said boiler adapted to boil water into high pressure high temperature steam utilizing heat from the products of combustion discharged from said gas generator, and said expander adapted to output power from the system.
33- The system of claim 32 wherein said carbon containing feedstock includes coal.
34- The system of claim 32 wherein said carbon containing feedstock includes biomass material.
35- The system of claim 32 wherein at least one of the elevated temperature products of combustion is water, and wherein the water produced within said gas generator is at least partially routed to said water inlet, such that the water entering said gas generator at said water inlet is at least partially water produced within said gas generator previously.
36- The system of claim 35 wherein a condenser is located downstream of said outlet of said gas generator, said condenser adapted to condense water within the products of combustion from steam to liquid water, said condenser including a liquid water outlet oriented upstream from said water inlet of said gas generator; and a water preheater located between said liquid water outlet of said condenser and said water inlet of said gas generator, said water preheater adapted to transfer heat from the products of combustion between said outlet of said gas generator and said condenser to the water passing from said condenser to said gas generator.
37- The system of claim 36 wherein said water preheater is adapted to heat the water therein sufficiently to boil the water from liquid water into steam, and wherein the water at said water inlet is steam.
38- The system of claim 37 wherein said oxygen from said source of oxidizer is in a gaseous phase.
39- The system of claim 32 wherein an expander is located downstream of an outlet of said gas generator, said expander adapted to expand flow discharged from said gas generator, said expander including a discharge.
40- The system of claim 39 wherein said expander is adapted to output power from the system.
41- The system of claim 40 wherein said expander includes at least one turbine.
42- The system of claim 41 wherein said expander includes a non-condensing gas turbine.
43- The system of claim 39 wherein said expander is located upstream of said heat exchanger.
44- The system of claim 32 wherein a condenser is located downstream of said gas generator, said condenser adapted to cool the products of combustion sufficiently to condense the steam in the products of combustion into liquid water, said condense including a gas outlet, said gas outlet discharging primarily CO2 and other gases not condensing within said condenser.
45- The system of claim 44 wherein said gas outlet includes at least one pump to pressurize the CO2 to a pressure at least as great as a pressure within a terrestrial formation, and wherein said gas outlet is coupled to a feed well adapted to deliver the CO2 into the terrestrial formation.
46- A zero emissions power generation system featuring both a closed Rankine cycle and an at least partially open direct heating Rankine cycle, comprising in combination:
a closed Rankine cycle working fluid recirculation loop including a working fluid heater, a working fluid expander, a working fluid condenser and a working fluid pump;
a source of oxidizer, the oxidizer being a majority oxygen;
a source of fuel, the fuel being capable of combustion with oxygen to produce elevated temperature products of combustion;
a combustor having an oxidizer inlet downstream from said source of oxidizer, a fuel inlet downstream from said source of fuel, said combustor adapted to combust the fuel with the oxygen to produce elevated temperature products of combustion, and an outlet adapted to release the elevated temperature products of combustion from the combustor;
an expander located downstream from said combustor outlet, said expander adapted to expand the products of combustion, and having a discharge; and
a heat exchanger downstream from said discharge, said heat exchanger adapted to transfer heat from said products of combustion to the working fluid of said closed Rankine cycle as at least a portion of said working fluid heater.
47- The system of claim 46 wherein said source of fuel includes the element hydrogen and the element carbon, such that said source of fuel is a source of hydrocarbon fuel.
48- The system of claim 47 wherein said source of fuel includes methane.
49- The system of claim 47 wherein said source of fuel includes syngas comprising hydrogen gas and carbon monoxide gas.
50- The system of claim 49 wherein said source of fuel includes a gasifier, said gasifier including an inlet for a carbon containing feedstock, and an inlet for oxygen from said source of oxidizer, said gasifier adapted to convert the carbon containing feedstock into syngas, said oxidizer including an outlet for syngas, said outlet upstream of said combustor fuel inlet.
51- The system of claim 46 wherein said combustor includes a water inlet, said combustor adapted to combine water from said water inlet with the elevated temperature products of combustion before discharge from said combustor from said outlet.
52- The system of claim 511 wherein at least one of the elevated temperature products of combustion is water, and wherein the water produced within said combustor is at least partially routed to said water inlet, such that the water entering said combustor at said water inlet is at least partially water produced within said combustor previously and said water acts as at least a portion of an at least partially open direct heating Rankine cycle.
53- The system of claim 52 wherein a condenser is located downstream of said outlet of said combustor, said condenser adapted to condense water within the products of combustion from steam to liquid water, said condenser including a liquid water outlet oriented upstream from said water inlet of said combustor; and a water preheater located between said liquid water outlet of said condenser and said water inlet of said combustor, said water preheater adapted to transfer heat from the products of combustion between said outlet of said combustor and said condenser to the water passing from said condenser to said combustor.
54- The system of claim 46 wherein said source of oxidizer includes an air separator, said air separator including an inlet for air and an outlet for oxidizer which is a majority oxygen, said air separator adapted to separate at least a portion of oxygen in the air from nitrogen in the air; wherein said air separator is adapted to cool the air to a temperature at which at least the nitrogen condenses into a liquid, to facilitate separation of the oxygen from the nitrogen; and wherein said expander is integrated with said air separator by providing an air compressor downstream of said air inlet of said air separator and driving said air compressor with said expander, such that an efficiency with which oxygen is separated from nitrogen in the air is enhanced.
55- The system of claim 46 wherein said expander includes a non-condensing gas turbine.
56- The system of claim 46 wherein the fuel from said source of fuel at least partially includes the element carbon, the combustor adapted to combust the carbon containing fuel into products of combustion including CO2, the system including a separator for the products of combustion, said separator including an outlet for primarily CO2; wherein said products of combustion include both CO2 and water, said separator including a condenser for the water, and said outlet for primarily CO2 being an outlet for gases not condensing within the condenser; and wherein said outlet for primarily CO2 includes at least one pump to pressurize the CO2 to a pressure at least as great as a pressure within a terrestrial formation, and wherein said outlet for primarily CO2 is coupled to a feed well adapted to deliver the CO2 into the terrestrial formation.
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US11/799,125 US7882692B2 (en) | 2004-04-16 | 2007-04-30 | Zero emissions closed rankine cycle power system |
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WO2005100754A3 (en) | 2006-04-27 |
US20070204620A1 (en) | 2007-09-06 |
WO2005100754A2 (en) | 2005-10-27 |
US7882692B2 (en) | 2011-02-08 |
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