[특허]Combustion control system

General Electric Company (Schenectady NY 02)

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Combustion control system

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02C-009/14
미국특허분류(USC)	60/3923 ; 60/3929 ; 60/3937
출원번호	US-0920191 (1978-06-29)
발명자 / 주소	Johnson Robert H. (Bolton Landing NY) Wilkes Colin (Scotia NY)
출원인 / 주소	General Electric Company (Schenectady NY 02)
인용정보	피인용 횟수 : 33 인용 특허 : 6

초록
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A combustion system for gas turbines is disclosed which is capable of burning gaseous and liquid fuels. Excess air injected into the reaction zone of the combustor produces either a fuel-lean or fuel-rich mixture which lowers the temperature at which combustion occurs and thereby reduces the amount of nitrogen oxides in the turbine exhaust. Efficient combustion is maintained across a wide range of turbine loads by means of a control mechanism disposed externally of the combustor, which directs the airflow from the compressor to the reaction zone and to the downstream dilution zone respectively in a manner which permits variable, inverse proportioning of the air supplied to these zones. The variation in the pressure drop across the combustor is maintained within acceptable limits throughout the full load range.

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In a gas turbine of the type wherein at least one combustor is coupled to the discharge of the compressor and the fuel is burned with excess air or excess fuel to maintain a low temperature of combustion, said combustor having a substantially tubular configuration and including a combustion liner configured to define an elongate combustion chamber substantially centered about an axis, said combustion chamber terminating in a chamber end wall at one end thereof and including a reaction zone near said chamber end wall and a dilution zone axially spaced from said reaction zone, fuel supply means extending into said reaction zone, and a hollow casing surrounding said combustor, said casing coaxially surrounding said combustor such that said space forms an annular configuration; a combustion control system comprising: means for dividing the space within said casing at least into first and second space portions isolated from each other and in substantial alignment with each other in an axial direction, said dividing means comprising a plenum chamber positioned in said annular space between said first and second space portions; means for coupling said first space portion to said compressor discharge in a reverse flow configuration; first and second air paths extending from said first space portion to said reaction zone and said dilution zone respectively, said paths comprising conduit means positioned externally of said casing, said conduit means including first, second and third conduit legs communicating respectively with said first space portion, said reaction zone and said dilution zone, said first and second conduit legs being coupled through said casing to said first and second space portions respectively, said first leg being shared by said first and second paths and said first path further including said second leg, and a first plurality of passages communicating between said second space portion and said combustion chamber in the vicinity of said reaction zone, said second path further including said third leg coupled through said casing to said plenum chamber, and a second plurality of passages communicating between said plenum chamber and said combustion chamber in the vicinity of said dilution zone; means external to said casing and upstream of said combustion chamber for varying the airflow in respective ones of said paths inversely with respect to each other, said means for varying said airflow comprising valve means adapted to admit air from said first leg in variable proportions to said second and third legs respectively; control means connected to said airflow varying means adapted to control the setting of the latter such that airflow from said first space portion into said first and second paths varies as a direct and inverse function respectively of at least one operating condition of said apparatus; and means controlled in accordance with at lest one load-responsive operating condition for energizing said control means to determine the setting of said valve means; whereby said turbine is enabled to operate efficiently with a fuel-lean or fuel-rich mixture across a wide load range and with minimum emission of exhaust pollutants.

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Combustion control system

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이 특허에 인용된 특허 (6)

이 특허를 인용한 특허 피인용횟수: 33

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이 특허에 인용된 특허 (6)

이 특허를 인용한 특허 피인용횟수: 33

IPC 상위 출원인

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