Air staged low-NOx burner

摘要

An apparatus and method for using staged air combustion. The apparatus includes a burner body ( 10 ) secured to a port block ( 42 ), and a fuel passageway ( 12 ) extending through the burner body ( 10 ), terminating in a fuel nozzle ( 22 ), which injects fuel into the burner throat ( 40 ). Primary air jets ( 20 ) are configured to inject primary air into a primary combustion region ( 24 ), which is normally in the burner throat ( 40 ). A dish with a dish surface ( 28 ) is connected to the burner throat ( 40 ); the dish surface ( 28 ) extending in a divergent angle with respect to a burner centerline ( 35 ). Secondary air jets ( 34 ) are connected to the air passageway ( 14 ) and extend through the port block ( 42 ). The secondary air jets ( 34 ) inject secondary air into a secondary combustion region ( 38 ), which may be at the dish surface ( 28 ) or the hot face ( 30 ) of the burner.