초록 ▼

A method and apparatus for reducing NO.sub.x emissions in a gas burner in which the burner includes a burner supply for supplying fuel gas and primary air to the furnace and projecting the fuel gas into the furnace, a secondary air supply for supplying secondary air to the burner, and a recirculatin

A method and apparatus for reducing NO.sub.x emissions in a gas burner in which the burner includes a burner supply for supplying fuel gas and primary air to the furnace and projecting the fuel gas into the furnace, a secondary air supply for supplying secondary air to the burner, and a recirculating device for mixing the secondary air with the spent gases inside the furnace, which is then recirculated and combusted to reduce NO.sub.x gases. The method of the invention includes the steps of supplying fuel gas and primary air to the furnace, projecting the fuel gas into the furnace, combusting the fuel gas and primary gas to produce spent gases, supplying secondary air to the furnace, mixing the secondary air with the spent gases inside the furnace to produce diluted air, and recirculating and combusting the diluted air with the fuel gas and primary air to reduce NO.sub.x emissions.

대표청구항 ▼

[ What is claimed is:] [1.] The low NO.sub.x gaseous fuel burner to be used in a furnace comprising:a burner supply means arranged substantially axially for supplying primary fuel and primary air to said furnace, secondary fuel supply means having a combustion end extending and directed substantiall

[ What is claimed is:] [1.] The low NO.sub.x gaseous fuel burner to be used in a furnace comprising:a burner supply means arranged substantially axially for supplying primary fuel and primary air to said furnace, secondary fuel supply means having a combustion end extending and directed substantially axially into said furnace, a secondary air supply means arranged to direct a supply of secondary air into said furnace adjacent said secondary fuel supply means, said combustion end of said secondary fuel supply means being directed for projecting said secondary fuel substantially axially into said furnace for combustion with said secondary air, said combustion thereby producing spent gases,a recirculating means positioned relative to said combustion end of said secondary fuel supply means to effect mixing of said secondary air with said secondary fuel and with said spent gases inside said furnace to produce diluted air, said diluted air being recirculated and combusted with said primary air and fuel to reduce NO.sub.x content in the resulting combustion gases.