Patent ID: 7198482

Claim:
A compact gas burner apparatus having a short flame length and a high turndown ratio for discharging a mixture of fuel gas and air into a furnace space wherein the mixture is burned and flue gases having low NO x content are formed therefrom comprising: a housing having an open end attached to said furnace space; means for introducing a controlled flow rate of said air into said housing attached thereto; a burner tile attached to the open end of said housing having an opening formed therein for allowing said air to flow therethrough and having a wall surrounding said opening which extends into said furnace space, the exterior sides of said wall being divided into sections by a plurality of radially positioned baffles attached thereto with alternate sections having different heights and slanting towards said opening at different angles and one or more of the alternating sections having primary fuel gas passageways formed therein for conducting primary fuel gas from outside said section to within said wall; a plurality of fuel gas nozzles connected to a source of fuel gas and positioned outside said wall of said burner tile for discharging secondary fuel gas adjacent to said external slanted wall sections with one or more of said fuel gas nozzles also discharging primary fuel gas mixed with flue gases into and through said primary fuel gas passageways whereby said secondary fuel gas mixes with flue gases in said furnace space, the mixture of secondary fuel gas and flue gases mixes with unburned air, primary fuel gas and flue gases flowing through said opening and wall of said burner tile, and the resultant mixture is burned in said furnace space; and said one or more of said alternating sections with primary fuel gas passageways formed therein having one or more deflectors attached thereto for deflecting the secondary fuel gas into separate streams that do not interact with each other.