[특허]Catalytic combustor with lean direct injection of gas fuel for low emissions combustion and methods of operation

Catalytic combustor with lean direct injection of gas fuel for low emissions combustion and methods of operation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02C-001/00 F02G-003/00
출원번호	US-0575809 (1995-12-22)
발명자 / 주소	Beebe Kenneth W. Hung Stephen L. Cutrone Martin B.
출원인 / 주소	General Electric Co.
대리인 / 주소	Nixon & Vanderhye
인용정보	피인용 횟수 : 56 인용 특허 : 0

초록 ▼

A combustor for a gas turbine includes a diffusion flame combustion zone, a catalytic combustion zone and a post-catalytic combustion zone. At start-up or low-load levels, fuel and compressor discharge air are supplied to the diffusion flame combustion zone to provide combustion products for the turbine. At mid-range operating conditions, the products of combustion from the diffusion flame combustion zone are mixed with additional hydrocarbon fuel for combustion in the presence of a catalyst in the catalytic combustion zone. Because the fuel/air mixture in the catalytic reactor bed is lean, the combustion reaction temperature is too low to produce thermal NO.sub.x. Under high-load conditions, a lean direct injection of fuel/air is provided in a post-catalytic combustion zone where auto ignition occurs with the reactions going to completion in the transition between the combustor and turbine section. In the post-catalytic combustion zone, the combustion temperature is low and the residence time in the transition piece is short, hence minimizing thermal NO.sub.x.

대표청구항 ▼

[ What is claimed is:] [1.] A combustor for an industrial gas turbine, comprising:a combustor housing for combusting fuel and confining a stream of combustion products for flow in a downstream direction, said combustion housing having (i) a diffusion flame combustion zone including a fuel nozzle for introducing fuel into said zone and air admission openings for introducing air into the zone; (ii) a catalytic combustion zone downstream of the diffusion flame combustion zone and including a catalytic reactor bed and a fuel inlet for supplying fuel thereto; (iii) a post-catalytic combustion zone downstream of said catalytic combustion zone including in said post-catalytic combustion zone a nozzle for flowing a fuel/air mixture into said post-catalytic combustion zone; and (iv) a transition piece downstream of said post-catalytic combustion zone between said post-catalytic combustion zone and a first stage of the gas turbine and in which transition piece secondary fuel oxidation reactions go to completion without substantial formation of NO.sub.x due to short residence time in said transition piece.

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Catalytic combustor with lean direct injection of gas fuel for low emissions combustion and methods of operation 원문보기

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