WO2014146860A1 - Power generation system and method to operate - Google Patents

Power generation system and method to operate Download PDF

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Publication number
WO2014146860A1
WO2014146860A1 PCT/EP2014/053443 EP2014053443W WO2014146860A1 WO 2014146860 A1 WO2014146860 A1 WO 2014146860A1 EP 2014053443 W EP2014053443 W EP 2014053443W WO 2014146860 A1 WO2014146860 A1 WO 2014146860A1
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WO
WIPO (PCT)
Prior art keywords
downstream
process fluid
feed water
fluid
rankine
Prior art date
Application number
PCT/EP2014/053443
Other languages
French (fr)
Inventor
Anders STUXBERG
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2014146860A1 publication Critical patent/WO2014146860A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • 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
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • 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
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/02—Arrangements or modifications of condensate or air pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
    • 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
    • Y02E20/32—Direct CO2 mitigation
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention relates to a method to operate a power generation system (PGS) and the device itself comprising: - an oxy-fuel-burner (OXB), - a first heat exchanger assembly (HEA1), - a rankine-cycle (RC), - wherein said rankine-cycle (RC). To improve the efficiency further features are proposed. Said oxy-fuel burner (OXB) generates an exhaust fluid (EXH) submitted to an exhaust fluid line (EXL) and said rankine-cycle (RC) is operated with said process fluid (PF) which is circulating separately from said exhaust fluid (EXH). Said exhaust fluid line (EXL) is provided with a recirculation line (RCL) downstream said first heat exchanger assembly (HEA1) and upstream said feed water heat exchanger (FWE) extracting exhaust fluid (EXH) from said exhaust fluid line (EXL), conducting extracted exhaust fluid (EXE) to a pump (PU) to increase pressure and injecting downstream said extracted exhaust fluid (EXE) into said oxy-fuel burner (OXB).

Description

Description
Power generation system and method to operate
The invention relates to a power generation system comprising
- an oxy-fuel-burner,
- a first heat exchanger assembly,
- a rankine-cycle, wherein said rankine-cycle comprises at least one turbine expanding a process fluid, downstream said turbine at least one condenser condensing said process fluid, downstream said condenser at least one first feed water pump delivering said process fluid to a higher pressure level, downstream said feed water pump at least one first feed water pre-heater heating said process fluid by extracted process fluid from said turbine, downstream said feed water pre- heater said process fluid passes said first heat exchanger assembly to be boiled and superheated. Power generation systems and respective methods to operate such systems are known for a long time since mechanical power or electrical power is generated especially by burning a fuel with an oxygen containing gas. Recently concerns came up about carbon-dioxide content in air increasing up to an amount where a so called green-house effect might occur.
Since such awareness is rising several projects are initiated to reduce the emission of carbon-dioxide. One of those pro¬ jects is burning a fuel with an oxygen containing gas other than air to a avoid the generation of NOx [nitrogen oxides] and to avoid the mixing of essential inert components with the carbon-dioxide generated during combustion to more easily enable the separation of carbon-dioxide from the exhaust gas generated. This easy separation simplifies storage of pure carbon-dioxide in a final storage capacity. Essentially pure carbon-dioxide can further better be used for subsequent chemical processes. The oxygen containing gas is basically pure oxygen with minor impurities generated by for example an air separation unit, which can be of conventional membrane type. In the context of this invention an oxy-fuel-burner is characterized by burning basically a fuel with an oxygen containing gas wherein said oxygen containing gas has significant higher oxygen content than ambient air and wherein oxygen is its main component and wherein said oxygen containing gas is preferably pure oxygen with some impurities. This oxygen containing gas may contain some further additives but its main component is preferably oxygen .
One known power generation system is disclosed in
US 7,021,063 B2, which deals with an oxy-fuel-burner respec- tively gas generator comprising a recuperative heat exchanger for reheating of steam that has passed a first expansion machine stage, which heat exchanger is heated by outlet steam respectively exhaust from said gas generator. The total efficiency of a conventional power generation sys¬ tem with an oxy-fuel-burner is significantly below the efficiency of an ordinary power generation system if the energy consumption of the air separation unit is considered. The ef¬ ficiency is therefore to be improved to make this technology economically feasible and to have a positive effect on the environment .
It is one object of the invention to improve the efficiency of the known power generation system comprising an oxy-fuel- burner.
The object of enhancing the efficiency of the incipiently de¬ fined power generation system is achieved by a power generation system according to the incipiently mentioned type with the further features of the characterizing portion of claim 1. Further the object is achieved by a method of the incipi¬ ently mentioned type with the further features of the charac¬ terizing portion of the independent method claim. One essential aspect of the proposed improvement of the power generation system respectively the method according to the invention is the
Combination of oxy-fuel combustion principle with a boiler design separating the carbon dioxide - steam cycle from the steam - water cycle. This unique feature enables the opera¬ tion of the exhaust fluid at elevated pressure above atmos- pheric pressure. Further high efficiency is achieved by tak¬ ing the recirculation of exhaust fluid from upstream economizers in the boiler such that as little heat as possible is moved from high temperature to a low temperature parts of the cycle .
Said oxy-fuel-burner according to the invention is basically a gas generator generating an exhaust gas respectively ex¬ haust fluid from a fuel burned with essentially pure oxygen. This exhaust gas is referred to as exhaust-fluid since it might contain liquid components or parts of the fluid might condense to a liquid.
A further beneficial efficiency improvement of the process according to the invention is obtained by providing said tur- bine as a combination of at least a high pressure turbine and a low pressure turbine, wherein between these two turbines the process fluid is led through a reheater, wherein said reheater is part of said first heat exchanger assembly, so that said process fluid is reheated by said exhaust fluid downstream said high pressure turbine and upstream said low pressure turbine.
Another beneficial improvement of the invention is given by providing at least one adjustable valve and/or one adjustable pump - which can be a multiphase pump or might as well be a compressor - to control the flow through said recirculation line. This control feature allows maintaining the desired ex¬ haust-fluid temperature downstream said oxy-fuel-burner re- spectively before said heat exchanger assembly. Preferably a control unit controls the position of said adjustable valve or pump in the recirculation line according to a temperature measurement located preferably upstream said heat exchanger assembly. This control unit is designed such that it receives the measurement results from temperature measurement and sub¬ mits control signals to said control valve. The control meth¬ od preferably is designed such that the valve opens further when exceeding a temperature limit is recognized. Further the valve control can be designed such that upper limits of tem¬ perature increases respectively steep temperature transients in a turbine of the power generation system are avoided.
Another preferred embodiment is given by a mixing pre-heater is provided upstream of said at least one first feed water pre-heater. Said mixing pre-heater mixes a third extracted process fluid from said turbine with said process fluid down¬ stream said condenser. Another preferred embodiment of the invention provides an air separation unit upstream of said oxy-fuel-burner to preferably separate oxygen from ambient air to be burned with a fuel in said oxy-fuel-burner . This air separation unit can be of a membrane type.
The above mentioned attributes and other features and advan¬ tageous of this invention and the manner of attaining them will become more apparent and the invention itself will be understood by reference to the following description of the currently known best mode of carrying out the invention taken in conjunction with the accompanying drawings, wherein figure 1 shows a schematic flow diagram of an oxy fuel power plant comprising the arrangement accord- ing to the invention and depicting the method according to the invention. Figure 1 is a schematic depiction of a simplified flow dia¬ gram showing a power generation system and illustrating a method according to the invention. Fuel F and oxygen O2 from an air separation unit ASU are both elevated to a higher pressure level by compressors CI, C2, which compressors CI, C2 might be provided with not shown in- tercoolers before both fluids are injected in an oxy-fuel- burner OXB at a pressure of around 20bar. In said oxy-fuel- burner OXB - which can also be considered as a gas generator - combustion takes place of said fuel F with said oxygen O2 generating exhaust gas hereinafter referred to as exhaust- fluid EXH. The exhaust fluid EXH exits said oxy-fuel-burner OXB and en¬ ters a first heat exchanger assembly HEA1.
Downstream said first exchanger assembly HEA1 said exhaust fluid EXH is divided at a division point DP into recirculated exhaust fluid EXE stream and the remaining exhaust flu¬ id (referred to as EXH even it is diminished by recirculated exhaust fluid stream EXE) being conducted through the continued exhaust fluid line. The temperature of said exhaust fluid stream EXH is adjusted by controlling said flow of recirculated exhaust fluid EXE to the oxy-fuel-burner OXB to be mixed with the fuel F and oxy¬ gen containing gas OCG and thus cool the exhaust-fluid EXH to the right temperature to subsequently enter said heat first exchanger assembly HEA1. This control is done by a control unit CU controlling a pump PU and/or a control valve CV. Op¬ tionally only one of the pump PU or the valve CV can be pro¬ vided. The pump can as well be a multiphase pump or a com¬ pressor depending on the phase of the recirculated exhaust fluid EXE.
Downstream said division point DP said exhaust fluid EXH passes a first cooler COL1 before it enters a feed water heat exchanger FWE transferring thermal energy to said process fluid PF of said rankine cycle. This additional sub-cooling effect further separates carbon dioxide CO2 from water ¾0 of the exhaust fluid EXH. Said feed water heat exchanger FEW provides further the feature of separating the gaseous phase from the liquid phase so that said carbon dioxide C02 is di¬ vided from the water H20 to be stored or to be recycled sepa¬ rately. The stream of carbon dioxide C02 and water H20 are respec¬ tively compressed and cooled by a respective intercooled com¬ pressor assembly CCC02, CCH20.
Said first exchanger assembly HEA1 comprises several single heat exchangers designed for different temperature levels of heat exchange. Figure 1 shows three of these heat exchangers a first assembly heat exchanger AHl, a second assembly heat exchanger AH2 and a third assembly heat exchanger AH3. Said rankine cycle RC comprises a high pressure turbine HPST and a low pressure turbine LPST, which are basically designed as steam turbines, wherein said turbines respectively said rankine cycle are/is operated using preferably water as a process fluid PF.
Said first exchanger assembly HEA1 works as the boiler of said rankine cycle RC boiling the water and superheating the steam generated to be expanded first in said high pressure turbine HPST starting from an entrance pressure level of around 150bar.
Upstream of said high pressure turbine HPST a full capacity first bypass station BST1 is provided to allow full operation flexibility especially during start-up and shut-down. Said high pressure turbine receives its steam respectively process fluid PF not from the most upstream first assembly heat ex¬ changer AHl but from said second assembly heat exchanger AH2 and is therefore not using the highest temperature level available from the exhaust fluid line EXL . After said process fluid PF as passed the high pressure turbine HPST it is con¬ ducted to the first assembly heat exchanger AH1 for being re¬ heated to further downstream pass a second full capacity by- pass station BST2 and to further downstream enter a low pressure turbine LPST to be expanded from 40bar down to around 0.045bar .
Both turbines HPST, LPST are driving a generator GEN but can as well be used to drive a different consumer.
During this expansion a first extracted process fluid stream XPF1, a second extracted process fluid stream XPF2, a third extracted process fluid stream XPF3 and a fourth extracted process fluid stream XPF4 are separated from the process flu¬ id PF to provide thermal energy to downstream process steps of the rankine cycle RC . The process fluid exiting said low pressure turbine LPST enters a condenser CON, where it is condensed to liquid together with said fourth extracted pro- cess fluid stream XPF4, which is recycled into the main pro¬ cess fluid PF.
Downstream said condenser CON said process fluid PF enters a first feed water pump FWP1 before receiving thermal energy from said fourth extracted process fluid stream XPF4 in an intermediated heat exchanger IHE. Further downstream said process fluid PF enters a mixing pre-heater MP and is mixed with said third extracted process fluid stream XPF3 directly coming from the extraction point of said low pressure turbine LPST. Said first and second extracted process fluid streams
XPF1, XPF2 and said fifth extracted process fluid stream XPF5 are injected into said mixing pre-heater MP, too, after they respectively were used to preheat said process fluid PF.
Downstream said mixing pre-heater MP said process fluid PF enters a second feed water pump FWP2 increasing the pressure well above 150bar before said process fluid enters downstream said feed water heat exchanger FWE . Subsequently said process fluid PF enters a preheating assembly PAS comprising a se- quence of three feed water pre-heaters, a first feed water pre-heater PHI, asecond feed water pre-heater PH2, a third feed water pre-heater PH3. Said first feed water pre-heater PHI consists of a first sub- cooler SCI and a first main heat exchanger MH1.
Said second feed water pre-heater PH2 consists of a second sub-cooler SC2 and a second main heat exchanger MH2, wherein said first feed water pre-heater PHI receives said second ex¬ tracted process fluid stream XPF2 and said second feed water pre-heater PH2 receives said first extracted process fluid stream XPFl.The respective sub-coolers are located upstream of the main heat exchangers with regard to said process fluid PF stream.
Said third feed water pre-heater PH3 is heated by a fifth ex¬ tracted process fluid stream XPF5 extracted from said high pressure turbine HPST, wherein said process fluid PF first passes a third heat exchanger HEX3 of said third feed water pre-heater PH3 before it enters said third feed water pre- heater PH3 and downstream enters said second heat exchanger HEX2 also heated by said fifth extracted process fluid stream XPF5. Downstream said second heat exchanger HEX2 said process fluid PF enters said third assembly heat exchanger AH3. Down¬ stream said second assembly heat exchanger AH2 said process fluid PF passes said first bypass station BST1 and further downstream enters said high pressure turbine HPST.

Claims

Patent claims
Power generation system (PGS) comprising
- an oxy-fuel-burner (OXB) ,
- a first heat exchanger assembly (HEA1),
- a rankine-cycle (RC) ,
- wherein said rankine-cycle (RC) comprises at least one turbine (ST) expanding a process fluid (PF) , downstream said turbine (ST) at least one condenser (CON) condens¬ ing said process fluid (PF) ,
- wherein said rankine-cycle (RC) comprises downstream said condenser (CON) at least one first feed water pump (FWP) delivering said process fluid (PF) to a high¬ er pressure level,
- wherein said rankine-cycle (RC) comprises downstream said feed water pump (FWP) at least one first feed water pre-heater (PH) heating said process fluid (PF) by extracted process fluid (XPF1, XPF2) from said tur¬ bine (ST),
- wherein downstream said feed water pre-heater (PHI, PH2, PH3) said process fluid (PF) passes said first heat exchanger assembly (HEA1) to be boiled and superheated, characterized in that,
- said oxy-fuel burner (OXB) generates an exhaust flu¬ id (EXH) submitted to an exhaust fluid line (EXL) ,
- said rankine-cycle (RC) is operated with said process fluid (PF) which is circulating separately from said ex¬ haust fluid (EXH) ,
- wherein downstream said first heat exchanger assembly (HEA1) at least one feed water heat exchanger (FWE) is provided to heat up said process fluid (PF) of said rankine-cycle (RC) downstream said feed water pump (FWP) and upstream said feed water preheater (PH) by said exhaust fluid (EXH) ,
- wherein said exhaust fluid line (EXL) is provided with a recirculation line (RCL) downstream said first heat exchanger assembly (HEA1) and upstream said feed water heat exchanger (FWE) extracting exhaust fluid (EXH) from said exhaust fluid line (EXL) , conducting extracted ex¬ haust fluid (EXE) to a pump (PU) to increase pressure and injecting downstream said extracted exhaust flu- id (EXE) into said oxy-fuel burner (OXB) .
2. Power generation system (PGS) according to claim 1, wherein said turbine (ST) is a combination of at least a high pressure turbine (HPST) and a low pressure turbine (LPST) , wherein between these two turbines said process fluid (PF) is led through a reheater (RH) ,
wherein said reheater (RH) is part of said first heat ex¬ changer assembly (HEA1), so that said process fluid (PF) is reheated by said exhaust fluid (EXH) downstream said high pressure turbine (HPST) and upstream said low pressure tur¬ bine (LPST) .
3. Power generation system (PGS) according to at least one of the preceding claims 1 to 2,
wherein said recirculation line (RCL) comprises at least one adjustable valve (CV) and/or pump (PU) or compressor to control the flow through said recirculation line (RCL) .
4. Power generation system (PGS) according to at least one of the preceding claims 1 to 3,
wherein upstream of said at least one first feed water pre- heater (PHI) a mixing pre-heater (MP) is provided mixing a third extracted process fluid (XPF3) from said turbine (ST) with said process fluid (PF) downstream said condenser (CON) .
5. Power generation system (PGS) according to at least one of the preceding claims,
wherein upstream said oxy-fuel-burner (OXB) is provided an air separation unit (ASU) as part of said power generation system (PGS) to provide pure oxygen (02) from ambient air.
6. Method to operate a power generation system (PGS) comprising the following steps: - providing an oxy-fuel-burner (OXB) , a first heat exchanger assembly (HEA1), a rankine-cycle (RC) ,
- generating an exhaust fluid (EXH) by said oxy-fuel burn¬ er (OXB) submitted to an exhaust fluid line (EXL) by burning oxygen 02 and fuel F,
- expanding a process fluid (PF) in said rankine-cycle (RC) comprising at least one turbine (ST) of said rankine- cycle (RC) ,
- condensing said process fluid (PF) downstream said tur- bine (ST) by at least one condenser (CON) of said rankine- cycle (RC) ,
- delivering said process fluid (PF) to a higher pressure level downstream said condenser (CON) by least one first feed water pump (FWP) of said rankine-cycle (RC) ,
- heating said process fluid (PF) by extracted process flu¬ id (XPF1, XPF2) from said turbine (ST) downstream said feed water pump (FWP) by at least one first feed water pre- heater (PH) of said rankine-cycle (RC) ,
- boiling and superheating said process fluid (PF) downstream said feed water pre-heater (PHI, PH2, PH3) by said first heat exchanger assembly (HEA1) of said rankine-cycle (RC) ,
characterized in the further steps:
- operating said rankine-cycle (RC) with said process flu¬ id (PF) which is circulating separately from said exhaust fluid (EXH) ,
- providing at least one feed water heat exchanger (FWE) downstream said first heat exchanger assembly (HEA1) and heating up said process fluid (PF) of said rankine-cycle (RC) downstream said feed water pump (FWP) and upstream said feed water preheater (PH) by said exhaust fluid (EXH) ,
- providing said exhaust fluid line (EXL) comprising a recirculation line (RCL) downstream said first heat exchanger assembly (HEA1) and upstream said feed water heat exchanger (FWE) extracting exhaust fluid (EXH) from said exhaust fluid line (EXL) ,
- conducting said extracted exhaust fluid (EXE) to a
pump (PU) to increase pressure and - injecting downstream said extracted exhaust fluid (EXE) into said oxy-fuel burner (OXB) .
7. Method according to claim 6, characterized by the fur- ther steps:
providing said turbine (ST) as a combination of at least a high pressure turbine (HPST) and a low pressure tur¬ bine (LPST),
- conducting said process fluid (PF) is through a
reheater (RH) located downstream of said high pressure turbine (HPST) and upstream of said low pressure turbine (LPST) , wherein said reheater (RH) is part of said first heat ex¬ changer assembly (HEA1), so that said process fluid (PF) is reheated by said exhaust fluid (EXH) downstream said high pressure turbine (HPST) and upstream said low pressure tur¬ bine (LPST) .
8. Method according to claim 7, characterized by the fur¬ ther steps:
- controlling the flow through said recirculation line (RCL) by at least one adjustable valve (CV) and/or pump (PU) or compressor .
9. Method according to claim 6, 7 or 8, characterized by the further steps:
mixing a third extracted process fluid (XPF3) from said tur¬ bine (ST) with said process fluid (PF) downstream said condenser (CON) upstream of said at least one first feed water pre-heater (PHI) by a mixing pre-heater (MP) .
10. Method according to claim 6, 7, 8 or 9, characterized by the further steps:
providing an air separation unit (ASU) as part of said power generation system (PGS) to generate pure oxygen (02) from am- bient air upstream said oxy-fuel-burner (OXB) .
PCT/EP2014/053443 2013-03-21 2014-02-21 Power generation system and method to operate WO2014146860A1 (en)

Applications Claiming Priority (2)

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EP13160405 2013-03-21

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