[특허]Multi-stage combustion using nitrogen-enriched air

[미국특허] Multi-stage combustion using nitrogen-enriched air 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F23C-005/00
출원번호	US-0295501 (2002-11-14)
발명자 / 주소	Fischer, Larry E. Anderson, Brian L.
출원인 / 주소	The Regents of the University of California
대리인 / 주소	Scott Eddie E.
인용정보	피인용 횟수 : 67 인용 특허 : 11

초록 ▼

Multi-stage combustion technology combined with nitrogen-enriched air technology for controlling the combustion temperature and products to extend the maintenance and lifetime cycles of materials in contact with combustion products and to reduce pollutants while maintaining relatively high combustion and thermal cycle efficiencies. The first stage of combustion operates fuel rich where most of the heat of combustion is released by burning it with nitrogen-enriched air. Part of the energy in the combustion gases is used to perform work or to provide heat. The cooled combustion gases are reheated by additional stages of combustion until the last stage is at or near stoichiometric conditions. Additional energy is extracted from each stage to result in relatively high thermal cycle efficiency. The air is enriched with nitrogen using air separation technologies such as diffusion, permeable membrane, absorption, and cryogenics. The combustion method is applicable to many types of combustion equipment, including: boilers, burners, turbines, internal combustion engines, and many types of fuel including hydrogen and carbon-based fuels including methane and coal.

대표청구항 ▼

1. In a combustion system, the improvement comprising:multi-stages of combustion including at least a first stage of combustion and a second stage of combustion,means for nitrogen-enriched air injection into said first stage of said multi-stages of combustion,means for fuel rich injection into said first stage of said multi-stages of combustion,said first stage of combustion producing first stage energy of combustion gases,means for work, heat, or work and heat extraction from at least a portion of said first stage energy of combustion gases, andmeans for injecting at least a portion of said first stage energy of combustion gases into said second stage of said multi-stages of combustion. 2. The improvement of claim 1, including means for reheating at least a portion of said first stage energy of combustion gases in said second stage of said multi-stages of combustion and wherein said multi-stages of combustion comprises at least two combustion stages. 3. The improvement of claim 1, wherein said multi-stage of combustion includes a final stage of combustion and including means for reheating at least a portion of said first stage energy of combustion gases in said second stage of said multi-stages of combustion such that said final stage of the combustion is at or near stoichiometric conditions. 4. The improvement of claim 1, including means for nitrogen-enriched air injection into said second stage of said multi-stage of combustion. 5. A combustion method, comprising,providing at least two combustion stages,directing an amount of nitrogen-enriched air into at least a first of the combustion stages,directing fuel in the first of the combustion stages,operating the first of the combustion stages under a fuel rich condition,using a portion of energy of combustion gases in the first of the combustion stages to perform work or to provide heat,reheating cooled combustion gases from the first of the combustion stages in at least another of the combustion stages such that in a final stage of the combustion stages such is at or near stoichiometric conditions. 6. The combustion method of claim 5, additionally including using a portion of energy of the combustion gases in each of the combustion stages to perform work or to provide heat. 7. The combustion method of claim 5, additionally including directing an amount of nitrogen-enriched air into each combustion stage subsequent to the first of the combustion stages. 8. The combustion method of claim 5, additionally controlling direction of the nitrogen-enriched air into each combustion stage subsequent to the first of the combustion stages such that there is a slightly rich fuel/oxidant mixture in each combustion stages except for the last combustion stage which is controlled to have a stoichiometric or near stoichiometric fuel/oxidant mixture. 9. The combustion method of claim 5, additionally controlling the burning of the fuel such that a larger portion is burned in the first of the combustion stages and smaller portions are burned in each subsequent combustion stage. 10. The combustion method of claim 5, additionally including controlling the temperature in each combustion stage such that the temperature decreases in each subsequent combustion stage.

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[미국특허] Multi-stage combustion using nitrogen-enriched air 원문보기

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[미국특허] Multi-stage combustion using nitrogen-enriched air 원문보기

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