[특허]Staged air, low NOX burner with internal recuperative flue gas recirculation

Staged air, low NOX burner with internal recuperative flue gas recirculation 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F23M-003/00
출원번호	US-0166449 (1993-12-13)
발명자 / 주소	Moreland Donald P. (Hershey PA)
출원인 / 주소	Gas Research Institute (Chicago IL 02)
인용정보	피인용 횟수 : 44 인용 특허 : 0

초록 ▼

A gas-fired burner incorporating an air driven jet pump for mixing air, fuel, and recirculated flue gas with reduced heat loss from the recirculated flue gas is disclosed. The burner is configured for the staged introduction of combustion air to provide a fuel-rich combustion zone and a fuel-lean combustion zone. Internal flue gas channels deliver cooled flue gas to the primary fuel-rich combustion zone. A valve assembly may be provided to control the flow of flue gas. Secondary air channels concentrically arranged within the flue gas channels deliver superheated, staged air to the secondary fuel-lean combustion zone. Heat is transferred from the hot flue gas to the counterflowing cooler secondary air. The burner achieves reduced NOx emission levels in high temperature applications which use preheated combustion air with no or minimal loss in thermal efficiency from flue gas recirculation.

대표청구항 ▼

A gas-fired burner comprising: a housing adapted to be mounted to an opening in a furnace; a jet pump body within said housing, said jet pump body including a jet pump defining a suction chamber, a mixing chamber, and a diffuser formed in said body, said mixing chamber being formed downstream from said suction chamber, said diffuser being formed downstream from said mixing chamber, said diffuser further having an exit for communication with the furnace, said diffuser further comprising a combustion chamber for primary zone partial combustion; an air inlet port on said housing for supplying air under pressure to said housing; said jet pump including a jet pump primary air nozzle within said housing interconnecting said air inlet port and said suction chamber for forcing air into said suction chamber; a fuel inlet port on said housing and terminating in a fuel nozzle for directing fuel into said jet pump; means forming a plurality of recirculating flue gas channels for directing flue gases from the furnace into said suction chamber, said jet body channels being spaced circumferentially about said jet pump, said flue gas channels having an entrance for communication with the furnace and an exit in communication with said suction chamber; means forming a plurality of secondary air passages, each of said plurality of passages being disposed within a respective one of said recirculating flue gas channels, each of said secondary air passages being further connected to said air inlet port, each of said plurality of secondary air passages having an exit for communication with the furnace; whereby air under pressure passing through said primary air passage and, in turn, through said jet pump means air nozzle and fuel gas under pressure passing through said fuel nozzle create a suction for drawing recirculating flue gas through said plurality of recirculating flue gas channels and said suction chamber and into said mixing chamber for mixing with the air and fuel to provide a fuel-rich combustion zone in said diffuser, whereby air under pressure passing through said plurality of secondary air passages mixes with the primary flame extending from said diffuser to produce a fuel-lean combustion zone in the furnace, thereby reducing NOx content, and whereby the air passing through said secondary air passages is heated by the recirculating flue gas passing through said recirculating flue gas channels.

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Staged air, low NOX burner with internal recuperative flue gas recirculation 원문보기

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Staged air, low NOX burner with internal recuperative flue gas recirculation 원문보기

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