초록 ▼

A gas-fired burner incorporating an air driven jet pump for mixing air, fuel, and 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. The burner achieves reduced NOx emissio

A gas-fired burner incorporating an air driven jet pump for mixing air, fuel, and 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. The burner achieves reduced NOx emission levels in high temperature applications which use preheated combustion air.

대표청구항 ▼

A gas-fired burner comprising: a housing adapted to be mounted to an opening in a furnace; a jet pump within said housing, comprising: means forming a suction chamber; means forming a mixing chamber downstream from said suction chamber; and means forming a diffuser downstream from said mixing chambe

A gas-fired burner comprising: a housing adapted to be mounted to an opening in a furnace; a jet pump within said housing, comprising: means forming a suction chamber; means forming a mixing chamber downstream from said suction chamber; and means forming a diffuser downstream from said mixing chamber, said diffuser 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; means forming a primary air passage within said housing interconnecting said air inlet port and said suction chamber, said primary air passage terminating in a jet pump air nozzle for forcing air into said suction chamber; means forming a plurality of secondary air passages within said housing connected to said air inlet port, each secondary air passage having an exit for communication with the furnace, said exits being spaced in a circumferential pattern about the diffuser exit; means forming a fuel inlet port on said housing and terminating in a fuel nozzle for directing fuel into said jet pump; and means forming a recirculating flue gas inlet port on said housing for directing flue gases from the furnace into said suction chamber; whereby air under pressure passing through said primary air passage and said air nozzle and fuel gas under pressure passing through said fuel nozzle create a suction for drawing recirculating flue gas through 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, and whereby air under pressure passing through said secondary air passages mixes at high velocity with the primary flame extending from said diffuser to produce a fuel-lean combustion zone in the furnace, thereby reducing NOx content.