초록 ▼

A burner apparatus and method for reducing nitrogen oxides that are formed during combustion of gaseous fuel. Primary gaseous fuel and excess oxidant are premixed to form a fuel/oxidant mixture which is introduced into and combusted within a primary combustion zone. Primary combustion products are i

A burner apparatus and method for reducing nitrogen oxides that are formed during combustion of gaseous fuel. Primary gaseous fuel and excess oxidant are premixed to form a fuel/oxidant mixture which is introduced into and combusted within a primary combustion zone. Primary combustion products are introduced into a secondary combustion zone. Secondary gaseous fuel is also introduced into the secondary combustion zone and is preferably mixed with the primary combustion products. The mixture of secondary gaseous fuel and primary combustion products is combusted in a secondary combustion zone. A portion of the secondary combustion products are internally recirculated into the secondary combustion zone. The overall combustion products can be externally recirculated and introduced into the primary combustion zone. A portion of the fuel/oxidant mixture, with or without the recirculated overall combustion products, can be bypassed around the primary combustion zone and introduced into the secondary combustion zone.

대표청구항 ▼

A burner apparatus comprising: primary feed means for mixing primary gaseous fuel with excess oxidant and introducing a fuel/oxidant mixture into a primary combustion zone; secondary feed means for introducing secondary gaseous fuel into a secondary combustion zone downstream with respect to said pr

A burner apparatus comprising: primary feed means for mixing primary gaseous fuel with excess oxidant and introducing a fuel/oxidant mixture into a primary combustion zone; secondary feed means for introducing secondary gaseous fuel into a secondary combustion zone downstream with respect to said primary combustion zone; recirculation means for internally recirculating into said secondary combustion zone a portion of secondary combustion products; and bypass means for bypassing at least a portion of said fuel/oxidant mixture and flue gas recirculated from said secondary combustion zone to said secondary feed means.