[특허]Fuel combusting method

ExxonMobil Upstream Research Company

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특허 상세정보

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Fuel combusting method

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01K-023/10 F02C-003/34 F02C-009/28 F02D-041/14
출원번호	US-0175715 (2014-02-07)
등록번호	US-9938861 (2018-04-10)
발명자 / 주소	Huntington, Richard A.
출원인 / 주소	ExxonMobil Upstream Research Company
대리인 / 주소	ExxonMobil Upstream Research Company Law Department
인용정보	피인용 횟수 : 0 인용 특허 : 537

초록

The present techniques are directed to systems and a method for combusting a fuel in a gas turbine. An exemplary method includes providing a fuel to a combustor on a gas turbine, providing an oxidant to the combustor, and combusting the fuel and the oxidant in the combustor to produce an exhaust gas. At least a portion of the exhaust gas is passed through a water-gas shifting catalyst to form a low CO content product gas.

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1. A method for combusting a fuel in a gas turbine, comprising: providing a fuel to a combustor on a gas turbine;providing an oxidant to the combustor;combusting the fuel and the oxidant in the combustor to produce a combustor exhaust gas;expanding the combustor exhaust gas in a turbine expander to produce an exhaust gas that comprises water vapor, carbon dioxide, and between 1,000 and 5,000 ppmv of each carbon monoxide and hydrogen;passing at least a portion of the exhaust gas to a heat recovery unit that comprises a water-gas shifting catalyst; andconverting a portion of the carbon monoxide and water vapor within the exhaust gas passed through the heat recovery unit into carbon dioxide and hydrogen via a water gas shift reaction to form a low CO content product gas. 2. The method of claim 1, comprising providing a diluent to the gas turbine and gas turbine combustor; and mixing a first portion of the diluent with at least one of the fuel, the oxidant, and the exhaust gas to cool the combustor, exhaust gas, or both. 3. The method of claim 2, comprising: extracting a second portion of diluent from the gas turbine or gas turbine combustor; anddelivering the said second portion of diluent to an oxidation catalyst unit configured to oxidize carbon monoxide, hydrogen and unburned hydrocarbons to carbon dioxide and water vapor and to produce a low oxygen content product gas. 4. The method of claim 1, comprising: compressing an oxidizing stream; andproviding a first portion of the oxidizing stream as the oxidant to the combustor. 5. The method of claim 1, comprising: compressing a fuel stream; andproviding a first portion of the fuel stream as the fuel to the combustor. 6. The method of claim 2, comprising compressing the diluent prior to delivering the first portion of diluent to the combustor and extracting a second portion of the diluent. 7. The method of claim 5, comprising providing a second portion of the fuel stream as a deoxidation fuel to an oxidation catalyst unit. 8. The method of claim 3, comprising providing a second portion of the oxidant as an oxidizer to the catalyst unit. 9. The method of claim 4 comprising providing essentially ambient air as the oxidizing stream. 10. The method of claim 1, comprising: measuring a parameter of the exhaust gas; andadjusting a fuel flow rate, an oxidant flow rate, or both to adjust the parameter to within a target set-point range. 11. The method of claim 1, comprising: measuring a parameter of the low CO content product gas; andadjusting a fuel flow rate, an oxidant flow rate, or both to adjust the parameter to within a target set-point range. 12. The method of claim 1, comprising measuring a parameter comprising oxygen concentration, carbon monoxide concentration, hydrogen concentration, unburned hydrocarbon concentration, nitrogen oxides or any combinations thereof in the exhaust gas, the low CO content product gas, or both. 13. The method of claim 12, comprising determining an equivalence ratio from the parameter. 14. The method of claim 1, comprising adjusting the ratio of the fuel to the oxidant to form a substantially stoichiometric mixture. 15. The method of claim 1, comprising adjusting the ratio of the fuel to the oxidant to obtain an exhaust gas comprising between about 100 parts-per-million (ppm) of carbon monoxide (CO) and about 5000 ppm of CO. 16. The method of claim 1, comprising: cooling the low CO content product gas to remove water;compressing the low CO content product gas;recirculating the low CO content product gas to the combustor as a diluent; andproviding the diluent to the combustor separately from the oxidant and the fuel. 17. The method of claim 1, comprising: driving an expander turbine with the exhaust gas; andgenerating mechanical power from the turbine expander. 18. The method of claim 1, comprising passing the at least a portion of the exhaust gas through an oxidation catalyst bed configured to oxidize carbon monoxide, hydrogen and unburned hydrocarbons to carbon dioxide and water vapor. 19. The method of claim 1, comprising injecting at least a portion of at least one of the low CO content product gas and low oxygen content product gas into a subterranean reservoir. 20. The method of claim 19, comprising compressing the portion of the at least one of the low CO content product gas and low oxygen content product gas with a compressor prior to injecting the portion of the at least one of the low CO content product gas and low oxygen content product gas into the subterranean reservoir. 21. The method of claim 3, comprising processing at least a portion of at least one of the low CO content product gas and low oxygen content product gas in a gas dehydration unit. 22. The method of claim 3, comprising processing at least a portion of at least one of the low CO content product gas and low oxygen content product gas in a carbon dioxide separation unit to produce a lean carbon dioxide stream and a rich carbon dioxide stream. 23. The method of claim 22, comprising injecting at least a portion of the lean carbon dioxide stream into a subterranean reservoir. 24. The method of claim 22, comprising injecting at least a portion of the rich carbon dioxide stream into a subterranean reservoir. 25. The method of claim 22, comprising providing at least a portion of the rich carbon dioxide stream to a carbon sequestration unit. 26. The method of claim 23, comprising compressing at least a portion of the lean carbon dioxide stream prior to injecting the lean carbon dioxide stream into the subterranean reservoir. 27. The method of claim 24, further compressing the at least a portion of the rich carbon dioxide stream to at least one rich product compressor prior to delivering the rich carbon dioxide stream to a subterranean reservoir for enhanced hydrocarbon recovery. 28. The method of claim 25, comprising compressing at least a portion of the rich carbon dioxide stream prior to providing the rich carbon dioxide stream to a carbon sequestration unit. 29. The method of claim 22, comprising processing at least a portion of the lean carbon dioxide stream in a gas dehydration unit. 30. The method of claim 22, comprising processing at least a portion of the rich carbon dioxide stream in a gas dehydration unit. 31. The method of claim 1, comprising cooling the exhaust gas in a heat recovery steam generator to produce steam. 32. The method of claim 31, comprising: driving a steam turbine with the steam; andgenerating mechanical power. 33. The method of claim 31, comprising heating process fluids with the steam. 34. The method of claim 1, comprising: cooling the exhaust gas in a heat recovery unit; andheating process fluids. 35. The method of claim 3, comprising measuring a parameter comprising oxygen concentration, carbon monoxide concentration, hydrogen concentration, unburned hydrocarbon concentration, nitrogen oxides or any combinations thereof in the low oxygen content product gas. 36. The method of claim 35, comprising adjusting the flow rate of the deoxidation fuel to cause the parameter to reach a target range. 37. The method of claim 35, comprising adjusting the flow rate of the oxidant to cause the parameter to reach a target range. 38. A gas turbine system, comprising: an oxidant system;a fuel system;a control system;a combustor adapted to receive and combust an oxidant from the oxidant system and a fuel from the fuel system to produce a combustor exhaust gas;a turbine expander fluidly coupled to the combustor to receive the combustor exhaust gas and produce an exhaust gas comprising water vapor, carbon dioxide, and between 1,000 and 5,000 ppmv of each carbon monoxide and hydrogen; anda heat recovery unit fluidly coupled to the expander that comprises a catalyst unit, the catalyst unit comprising a water gas shifting (WGS) catalyst configured to reduce the concentration of carbon monoxide in the exhaust gas to form a low CO content product gas. 39. The gas turbine system of claim 38, comprising a sensor in communication with the control system, wherein the sensor is adapted to measure at least one parameter of the exhaust gas, the low CO content product gas, or both, and wherein the control system is configured to adjust the oxidant, the fuel, or both, based, at least in part, on the parameter measured by the sensor. 40. The gas turbine system of claim 38, comprising a recirculation loop between an outlet of an expander section of a gas turbine engine and an inlet to a compressor section of the gas turbine engine. 41. The gas turbine system of claim 40 comprising a heat-recovery steam generator (HRSG) configured to receive the exhaust gas from the gas turbine engine and to generate steam from the residual heat of the exhaust gas. 42. The gas turbine system of claim 40, comprising a booster blower in the recirculation loop, wherein the booster blower is disposed downstream of the HRSG. 43. The gas turbine system of claim 40, comprising a heat exchanger within the recirculation loop upstream of the compressor section of the gas turbine engine cooling the product stream. 44. A heat recovery unit, comprising: a heat exchanger configured to remove heat energy from an exhaust gas; anda water gas shifting (WGS) catalyst bed configured to reduce a concentration of a target gas in the exhaust gas. 45. The heat recovery unit of claim 44, wherein the WGS catalyst bed is located in a temperature region selected for operation of the WSG catalyst.

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Fuel combusting method

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Fuel combusting method

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