US3914091A - Combustion method for hydrocarbonic fuels with low emission of nitrogen oxides - Google Patents
Combustion method for hydrocarbonic fuels with low emission of nitrogen oxides Download PDFInfo
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- US3914091A US3914091A US447035A US44703574A US3914091A US 3914091 A US3914091 A US 3914091A US 447035 A US447035 A US 447035A US 44703574 A US44703574 A US 44703574A US 3914091 A US3914091 A US 3914091A
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- 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
- F23C13/00—Apparatus in which combustion takes place in the presence of catalytic material
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- 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
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/40—Continuous combustion chambers using liquid or gaseous fuel characterised by the use of catalytic means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
A combustion method for hydrocarbonic fuels with low emission of nitrogen oxides comprising a step of primary combustion where a hydrocarbonic fuel mixed with air in an amount less than 70 percent of the theoretically required amount for completion of combustion of the fuel is subjected to a primary combustion and then allowed to pass through a process of accelerating the partial combustion to decompose into simple inorganic gases consisting mainly of H2 and CO as combustible components, and a step of secondary combustion where the simple inorganic gases are led to a secondary combustion chamber independent from the foregoing steps to have the combustion completed with feed of air for combustion. A combustion method for hydrocarbonic fuels with low emission of nitrogen oxides comprising a step of primary combustion where a hydrocarbonic fuel mixed with air in an amount less than 70 percent of the theoretically required amount for completion of combustion of the fuel is subjected to a primary combustion and then allowed to pass through a process of accelerating the partial combustion to decompose into simple inorganic gases consisting mainly of H2 and CO as combustible components, and a step of final combustion where the simple inorganic gases are led across heat absorbing processes to a combustion chamber independent from the foregoing steps for completion of the combustion with feed of air for combustion.
Description
United States Patent 1 Yamagishi et a1.
[ COMBUSTION METHOD FOR HYDROCARBONIC FUELS WITH LOW EMISSION OF NITROGEN OXIDES [75] Inventors: Kazuo Yamagishi, Urawa; Masaaki Nozawa, Yokohama; Tsunenori Tokumoto, Yokosuka, all of Japan [73] Assignee: Tokyo Gas Company Limited,
Tokyo, Japan 221 Filed: Feb. 23, 1974 [21] Appl. No.: 447,035
Primary Examiner-Edward G. Favors Attorney, Agent, or FirmWenderoth, Lind 8!. Ponack [57] ABSTRACT A combustion method for hydrocarbonic fuels with 1 Oct. 21, 1975 low emission of nitrogen oxides comprising a step of primary combustion where a hydrocarbonic fuel mixed with air in an amount less than 70 percent of the theoretically required amount for completion of combustion of the fuel is subjected to a primary combustion and then allowed to pass through a process of accelerating the partial combustion to decompose into simple inorganic gases consisting mainly of H, and CO as combustible components, and a step of secondary combustion where the simple inorganic gases are led to a secondary combustion chamber independent from the foregoing steps to have the combustion completed with feed of air for combustion.
A combustion method for hydrocarbonic fuels with low emission of nitrogen oxides comprising a step of primary combustion where a hydrocarbonic fuel mixed with air in an amount less than 70 percent of the theoretically required amount for completion of combustion of the fuel is subjected to a primary combustion and then allowed to pass through a process of accelerating the partial combustion to decompose into simple inorganic gases consisting mainly of 1-1 and CO as combustible components, and a step of final combustion where the simple inorganic gases are led across heat absorbing processes to a combustion chamber independent from the foregoing steps for completion of the combustion with feed of air for combustion.
2 Claims, 1 Drawing Figure Heat. absorbing process COMBUSTION METHOD FOR I-IYDROCARBONIC FUELS WI'I'I'I LOW EMISSION OF NITROGEN OXIDES DESCRIPTION OF THE INVENTION This invention is concerned with a method of combustion of hydrocarbonic fuels with low emission of nitrogen oxides. It is known theoretically as well as experimentally that nitrogen oxides (N are less produced in combustion at an air ratio less than the theoretical requirement. Further, in the secondary combustion and thereafter, the combustion temperature generally tends to decline so that the amount of nitrogen oxides to be produced tends to decrease. But, when the conventional staged combustion method is used in which diffusion flames are preferred, the following difficulties are involved, viz. (1) although the primary combustion may be of combustion under the air ratio below the theoretical requirement as a whole, there may be locally created an oxygen rich region where NO are likely to be produced; (2) the partial combustion may not be completed in the primary combustion resulting to the production of the hydrocarbonic gas components which tend to produce soot, leading to troubles of soot formation in the heat absorbing processes after the primary combustion or in the stage of secondary combustion; and (3) the stage of secondary combustion has a large amount of hydrocarbon left so that there is much formation of the so-called prompt NO probably due to the C-l-I radicals. With such difficulties, there is a limit in the final reduction of N0 and the reduction rate is 50 to 60 percent at best.
The combustion method of the present invention eliminates the difficulties of the conventional staged combustion method entirely. According to the combustion method of the invention, a hydrocarbonic fuel is mixed with air in an amount less than 70 percent of the theoretically required amount, and is subjected to a primary combustion and then allowed to pass through a process of accelerating the partial combustion to decompose into simple inorganic gases consisting mainly of H, and CO as combustible components, then the simple inorganic gases are led to an independent secondary combustion chamber from the foregoing stages for completion of the combustion with feed of air for combustion. Any hydrocarbonic fuels are applicable, and as a partial combustion accelerating process, a combustion chamber having a sufficient geometric volume or some catalytic layer kept at an appropriate temperature may be used. As a catalyst, any of the nickel catalysts usually used as a catalyst for partial combustion of hydrocarbons can be used.
Now the low NO, emission characteristics of a staged combustion method having such a partial combustion accelerating process incorporated will be described. In the primary combustion, a fuel is burned at a ratio of air sufficiently lower than 70 percent of the theoretical requirement. For such combustion, a premix flame is preferable in that it produces only a small amount of NO in the primary combustion, but from the aspect of stability of combustion, the diffusion flame is advantageous. However, when the diffusion flame is used, the amount of NO, produced in the primary combustion tends to increase, as mentioned in the foregoing. In this stage, the partial combustion is not complete, and a large amount of undecomposed hydrocarbon or Cl-l compounds are present. The gas is then led to a promising partial combustion accelerating process which consists of some catalytic layer or a combustion chamber having sufficient geometric volume and the following reactions proceed:
and the gas is decomposed into simple inorganic gases comprising mainly CO and H, as combustible components. It must be noted here that the NO produced in the primary combustion are reduced in the partial combustion accelerating process by H, and CO produced by the partial combustion. Thus, there is obtained a high temperature partial combustion gas containing mainly C0 and H as combustible components with little NO This gas is then subjected to a secondary combustion together with air for secondary combustion. But, in order to reduce the generation of NO, in the secondary combustion to a low level, it is preferable to pass the gas through a heat absorbing process as is generally practiced in the conventional stage combustion. In this case, the gas contains no unstable intermediate products of combustion as a substance producing soot but consists mainly of relatively stable CO and H, so that formation of soot can be suppressed to a minimum. Since the combustible gases in the secondary combustion are for the most part H and CO, a low temperature combustion enabling to suppress the generation of NO to a sufficiently low level is practicable, and if required, an oxidation catalyst for low temperature combustion can be used. Where the cooling process after the partial combustion has to be omitted from the restriction in the configuration of combustion equipment and thus the partial combustion gas of high temperature is immediately brought to the secondary combustion, the unburned portion according to the present method consists of H and CO so that the final emission of NO can be reduced to a far lower level than that in the conventional combustion of hydrocarbons.
As an example, experimental data are shown in the following. With the primary and secondary air ratios taken as percent and 50 percent of the theoretical amount respectively (viz. percent in total) and a Ni catalyst is used as the partial combustion accelerating process, the combustion is carried out at a temperature of about l,l00C. The values of measurement of NO, are l to 2 ppm at the exit of the catalytic layer and less than 10 ppm at the point of termination of the secondary combustion, indicating that the NO, content is suppressed to a low level not attainable by the conventional staged combustion method. In the foregoing example, a Ni catalyst is used for the process of accelerating the partial combustion, but the method of the invention is not limited thereto. In the combustion method of the present invention, anything can be used for such purpose if it will decompose the unburned hydrocarbon component in the primary combustion gas burned in air less than 70 percent of that theoretically required to simple inorganic gases comprising CO and H, and preferably to accelerate the reduction of NO by hydrogen or CO. For example, the acceleration of partial combustion may be accomplished not by a catalyst but by a combustion chamber having a sufficiently large geometric volume as described in the foregoing. As an example, there are obtained, under the conditions of combustion of the primary and secondary air ratios at 55 percent and 65 percent respectively (viz. I20 percent in total), SV at 1,000 hrs and temperature at l,050C., the values of measurement are l to 2 ppm at the exit of the primary combustion chamber and ppm at the point of termination of the secondary combustion chamber. Now referring to the secondary combustion chamber, the combustion method of the present invention has the secondary combustion and subsequent processes isolated from the processes of the prior stages. Thus, the method of the invention has an advantage in that for various configurations of the secondary combustion chamber, any advantageous pattern of secondary combustion for NO, combustion can be determined freely without any adverse effect upon the processes of the prior stages. Further, in the combustion method of the invention having the partial combustion accelerating process incorporated, the secondary combustion is mainly of H and CO which are readily combustible gases so that the combustion is completed with ease and that it is possible to reduce the emission of CO to a minimum even under a low excess air ratio. As described in the foregoing, the combustion method of the present invention is a unique method which reduces the emission of hazardous substances such as NO, and CO and that of unburned gases to a minimum.
DRAWING The drawing represents a block diagram of the method of the present invention wherein numeral 1 indicates a fuel system and numeral 2 indicates an air systern.
1. A combustion method for hydrocarbonic fuel which results in low emission of nitrogen oxides comprising a primary combustion step of mixing a hydrocarbonic fuel with air in the amount of less than per cent of the theoretically required amount for complete combustion of the fuel and then accelerating the partial combustion in the presence of a nickel catalyst to decompose the fuel into simple inorganic gases consisting mainly of H and CO as combustible components, and a secondary combustion step of transferring the simply inorganic gases to a secondary combustion chamber for completing combustion, further air being provided in said secondary combustion chamber.
2. A combustion method for hydrocarbonic fuel which results in low emission of nitrogen oxides comprising a primary combustion step of mixing a hydrocarbonic fuel with air in the amount of less than 70 per cent of the theoretically required amount for complete combustion of the fuel and then accelerating the partial combustion in the presence of a nickel catalyst to decompose the fuel into simple inorganic gases consisting mainly of H, and CO as combustible components, and a secondary combustion step of transferring the simple inorganic gases through a heat absorbing means and thence to a combustion chamber for completing combustion, further air being provided in said combustion chamber.
I! it
Claims (2)
1. A COMBUSTION METHOD FOR HYDROCARBONIC FUEL WHICH RESULTS IN LOW EMISSION OF NITROGEN OXIDE COMPRISING A PRIMARY COMBUSTION STEP OF MIXING A HYDROCARBONIC FUEL WITH AIR IN THE AMOUNT OF LESS THAN 70 PER CENT OF THE THEORETICALLY REQUIRED AMOUNT FOR COMPLETE COMBUSTION OF THE FUEL AND THEN ACCELERATING THE PARTIAL COMBUSTION IN THE PRESENCE OF A NICKEL CATALYST TO DECOMPOSE THE FUEL INTO SIMPLE INORGANIC GASES CONSISTING MAINLY OF H2 AND CO AS COMBUSTIBLE COMPONENTS. AND A SECONDARY COMBUSTION STEP OF TRANSFERRING THE SIMPLY INORGANIC GASES TO A SECONDARY COMBUSTION CHAMBER FOR COMPLETING COMBUSTION FURTHER AIR BEING PROVIDED IN SAID SECONDARY COMBUSTION CHAMBER.
2. A combustion method for hydrocarbonic fuel which results in low emission of nitrogen oxides comprising a primary combustion step of mixing a hydrocarbonic fuel with air in the amount of less than 70 per cent of the theoretically required amount for complete combustion of the fuel and then accelerating the partial combustion in the presence of a nickel catalyst to decompose the fuel into simple inorganic gases consisting mainly of H2 and CO as combustible components, and a secondary combustion step of transferring thE simple inorganic gases through a heat absorbing means and thence to a combustion chamber for completing combustion, further air being provided in said combustion chamber.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48024697A JPS5237611B2 (en) | 1973-03-01 | 1973-03-01 |
Publications (1)
Publication Number | Publication Date |
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US3914091A true US3914091A (en) | 1975-10-21 |
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US447035A Expired - Lifetime US3914091A (en) | 1973-03-01 | 1974-02-28 | Combustion method for hydrocarbonic fuels with low emission of nitrogen oxides |
Country Status (4)
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US (1) | US3914091A (en) |
JP (1) | JPS5237611B2 (en) |
DE (1) | DE2409950B2 (en) |
FR (1) | FR2220043B1 (en) |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2337305A1 (en) * | 1975-12-29 | 1977-07-29 | Engelhard Min & Chem | PROCESS FOR BURNING FUELS CONTAINING NITROGEN |
US4047877A (en) * | 1976-07-26 | 1977-09-13 | Engelhard Minerals & Chemicals Corporation | Combustion method and apparatus |
US4054028A (en) * | 1974-09-06 | 1977-10-18 | Mitsubishi Jukogyo Kabushiki Kaisha | Fuel combustion apparatus |
US4067299A (en) * | 1975-09-25 | 1978-01-10 | Daimler-Benz Aktiengesellschaft | Split-gas production for internal combustion engine |
US4090362A (en) * | 1976-08-23 | 1978-05-23 | Bourque Robert F | External combustion power cycle and engine with combustion air preheating |
US4095928A (en) * | 1977-02-14 | 1978-06-20 | Southern California Edison Company | Method of reducing nitrogen oxide emissions in flue gas |
US4113417A (en) * | 1974-11-06 | 1978-09-12 | Stein Industrie | Combustion of hot gases of low calorific power |
US4231302A (en) * | 1979-05-14 | 1980-11-04 | Albert Neuhaus-Schwermann | Apparatus and process for burning of fuels of relatively young geological age and of any resulting gases |
US4422391A (en) * | 1981-03-12 | 1983-12-27 | Kawasaki Jukogyo Kabushiki Kaisha | Method of combustion of pulverized coal by pulverized coal burner |
US4562795A (en) * | 1983-07-20 | 1986-01-07 | Firma Ferdinand Lentjes Dampfkessel- Und Maschinenbau | Process and equipment for reducing the emission of pollutants in flue gases from furnace installations |
US4761132A (en) * | 1987-03-04 | 1988-08-02 | Combustion Tec, Inc. | Oxygen enriched combustion |
US4842509A (en) * | 1983-03-30 | 1989-06-27 | Shell Oil Company | Process for fuel combustion with low NOx soot and particulates emission |
WO1989006334A1 (en) * | 1988-01-04 | 1989-07-13 | Oy Tampella Ab | A method of comubustion for the reduction of the formation of nitrogen oxides in a combustion process, and an apparatus for applying the method |
US4878830A (en) * | 1988-06-20 | 1989-11-07 | Exxon Research And Engineering Company | Substoichiometric fuel firing for minimum NOx emissions |
US4909727A (en) * | 1987-03-04 | 1990-03-20 | Combustion Tec, Inc. | Oxygen enriched continuous combustion in a regenerative furance |
US5316750A (en) * | 1990-07-05 | 1994-05-31 | Eduardo Szegu | Hydrocarbon combustion process in which the carbon dioxide produced is prevented from dispersing onto the atmosphere, and a plant for its implementation |
US5683238A (en) * | 1994-05-18 | 1997-11-04 | Praxair Technology, Inc. | Method for operating a furnace |
US5895211A (en) * | 1994-12-27 | 1999-04-20 | Asea Brown Boveri Ag | Method and device for supplying a gaseous fuel to a premixing burner |
WO2004020901A1 (en) * | 2002-08-30 | 2004-03-11 | Alstom Technology Ltd | Hybrid burner and corresponding operating method |
US20060080967A1 (en) * | 2004-10-20 | 2006-04-20 | Colket Meredith B Iii | Method and system for rich-lean catalytic combustion |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5225479A (en) * | 1975-08-21 | 1977-02-25 | Asahi Chem Ind Co Ltd | Exhaust gas purifying method |
US4144017A (en) * | 1976-11-15 | 1979-03-13 | The Babcock & Wilcox Company | Pulverized coal combustor |
DE2850551A1 (en) * | 1977-11-29 | 1979-06-07 | Exxon Research Engineering Co | MULTISTAGE PROCESS FOR COMBUSTION OF COMBINED NITROGEN CONTAINING FUELS |
JPS5596811A (en) * | 1979-01-19 | 1980-07-23 | Masaki Sadakata | Method for low nox combustion utilizing reduction by soot |
AT391195B (en) * | 1987-09-21 | 1990-08-27 | Vaillant Gmbh | METHOD FOR BURNING LIQUID OR GASEOUS FUELS AND DEVICE FOR CARRYING OUT THE METHOD |
AT391185B (en) * | 1988-02-08 | 1990-08-27 | Vaillant Gmbh | DEVICE FOR STAGE COMBUSTION OF A FUEL-AIR MIXTURE |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3228451A (en) * | 1957-06-25 | 1966-01-11 | Urquhart S 1926 Ltd | Method of burning fuels |
US3730668A (en) * | 1971-03-03 | 1973-05-01 | Tokyo Gas Co Ltd | Combustion method of gas burners for suppressing the formation of nitrogen oxides and burner apparatus for practicing said method |
US3746498A (en) * | 1972-01-24 | 1973-07-17 | Combustion Eng | Reducing no{11 {11 emissions by additive injection |
US3770369A (en) * | 1971-03-31 | 1973-11-06 | Mitsui Shipbuilding Eng | Method of burning liquid fuel in fluid bed apparatus |
US3832122A (en) * | 1971-11-15 | 1974-08-27 | Aqua Chem Inc | Reduction of nitrogen oxides from products of hydrocarbon combustion with air |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE361276A (en) * | ||||
FR648844A (en) * | 1926-06-24 | 1928-12-14 | Process for the preparation of mixtures of hydrogen and nitrogen | |
DE1135430B (en) * | 1969-06-16 | 1962-08-30 | Engelhard Ind Inc | Process for the selective reduction of oxides of nitrogen in exhaust gas mixtures that arise during the production of nitric acid from ammonia |
-
1973
- 1973-03-01 JP JP48024697A patent/JPS5237611B2/ja not_active Expired
-
1974
- 1974-02-28 FR FR7406845A patent/FR2220043B1/fr not_active Expired
- 1974-02-28 US US447035A patent/US3914091A/en not_active Expired - Lifetime
- 1974-03-01 DE DE2409950A patent/DE2409950B2/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3228451A (en) * | 1957-06-25 | 1966-01-11 | Urquhart S 1926 Ltd | Method of burning fuels |
US3730668A (en) * | 1971-03-03 | 1973-05-01 | Tokyo Gas Co Ltd | Combustion method of gas burners for suppressing the formation of nitrogen oxides and burner apparatus for practicing said method |
US3770369A (en) * | 1971-03-31 | 1973-11-06 | Mitsui Shipbuilding Eng | Method of burning liquid fuel in fluid bed apparatus |
US3832122A (en) * | 1971-11-15 | 1974-08-27 | Aqua Chem Inc | Reduction of nitrogen oxides from products of hydrocarbon combustion with air |
US3746498A (en) * | 1972-01-24 | 1973-07-17 | Combustion Eng | Reducing no{11 {11 emissions by additive injection |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4054028A (en) * | 1974-09-06 | 1977-10-18 | Mitsubishi Jukogyo Kabushiki Kaisha | Fuel combustion apparatus |
US4113417A (en) * | 1974-11-06 | 1978-09-12 | Stein Industrie | Combustion of hot gases of low calorific power |
US4067299A (en) * | 1975-09-25 | 1978-01-10 | Daimler-Benz Aktiengesellschaft | Split-gas production for internal combustion engine |
FR2337305A1 (en) * | 1975-12-29 | 1977-07-29 | Engelhard Min & Chem | PROCESS FOR BURNING FUELS CONTAINING NITROGEN |
US4054407A (en) * | 1975-12-29 | 1977-10-18 | Engelhard Minerals & Chemicals Corporation | Method of combusting nitrogen-containing fuels |
US4047877A (en) * | 1976-07-26 | 1977-09-13 | Engelhard Minerals & Chemicals Corporation | Combustion method and apparatus |
US4090362A (en) * | 1976-08-23 | 1978-05-23 | Bourque Robert F | External combustion power cycle and engine with combustion air preheating |
US4095928A (en) * | 1977-02-14 | 1978-06-20 | Southern California Edison Company | Method of reducing nitrogen oxide emissions in flue gas |
US4231302A (en) * | 1979-05-14 | 1980-11-04 | Albert Neuhaus-Schwermann | Apparatus and process for burning of fuels of relatively young geological age and of any resulting gases |
US4422391A (en) * | 1981-03-12 | 1983-12-27 | Kawasaki Jukogyo Kabushiki Kaisha | Method of combustion of pulverized coal by pulverized coal burner |
US4842509A (en) * | 1983-03-30 | 1989-06-27 | Shell Oil Company | Process for fuel combustion with low NOx soot and particulates emission |
US4562795A (en) * | 1983-07-20 | 1986-01-07 | Firma Ferdinand Lentjes Dampfkessel- Und Maschinenbau | Process and equipment for reducing the emission of pollutants in flue gases from furnace installations |
EP0281144A2 (en) * | 1987-03-04 | 1988-09-07 | Combustion Tec. Inc. | Oxygen enriched combustion |
US4761132A (en) * | 1987-03-04 | 1988-08-02 | Combustion Tec, Inc. | Oxygen enriched combustion |
US4909727A (en) * | 1987-03-04 | 1990-03-20 | Combustion Tec, Inc. | Oxygen enriched continuous combustion in a regenerative furance |
EP0281144A3 (en) * | 1987-03-04 | 1990-04-04 | Combustion Tec. Inc. | Oxygen enriched combustion |
WO1989006334A1 (en) * | 1988-01-04 | 1989-07-13 | Oy Tampella Ab | A method of comubustion for the reduction of the formation of nitrogen oxides in a combustion process, and an apparatus for applying the method |
US4878830A (en) * | 1988-06-20 | 1989-11-07 | Exxon Research And Engineering Company | Substoichiometric fuel firing for minimum NOx emissions |
US5316750A (en) * | 1990-07-05 | 1994-05-31 | Eduardo Szegu | Hydrocarbon combustion process in which the carbon dioxide produced is prevented from dispersing onto the atmosphere, and a plant for its implementation |
US5683238A (en) * | 1994-05-18 | 1997-11-04 | Praxair Technology, Inc. | Method for operating a furnace |
US5895211A (en) * | 1994-12-27 | 1999-04-20 | Asea Brown Boveri Ag | Method and device for supplying a gaseous fuel to a premixing burner |
WO2004020901A1 (en) * | 2002-08-30 | 2004-03-11 | Alstom Technology Ltd | Hybrid burner and corresponding operating method |
US20050196714A1 (en) * | 2002-08-30 | 2005-09-08 | Alstom Technology, Ltd. | Hybrid burner and associated operating method |
US7717700B2 (en) | 2002-08-30 | 2010-05-18 | Alstom Technology Ltd. | Hybrid burner and associated operating method |
US20060080967A1 (en) * | 2004-10-20 | 2006-04-20 | Colket Meredith B Iii | Method and system for rich-lean catalytic combustion |
US7444820B2 (en) * | 2004-10-20 | 2008-11-04 | United Technologies Corporation | Method and system for rich-lean catalytic combustion |
Also Published As
Publication number | Publication date |
---|---|
DE2409950B2 (en) | 1978-09-28 |
JPS49124625A (en) | 1974-11-28 |
JPS5237611B2 (en) | 1977-09-24 |
FR2220043A1 (en) | 1974-09-27 |
DE2409950A1 (en) | 1974-09-05 |
FR2220043B1 (en) | 1977-09-16 |
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