Patent ID: 6877980

Claim:
A burner for the combustion of fuel in a furnace, said burner comprising: (a) a primary air chamber; (b) a burner tube having an upstream end, a downstream end and a venturi intermediate said upstream and downstream ends, said venturi including a throat portion having substantially constant internal cross-sectional dimension such that the ratio of the length to maximum internal cross-sectional dimension of said throat portion is at least 3; (c) a burner tip mounted on the downstream end of said burner tube adjacent a first opening in the furnace, so that combustion of the fuel takes place downstream of said burner tip; and (d) a fuel orifice located adjacent the upstream end of said burner tube, for introducing fuel into said burner tube; wherein said burner tip comprises a plurality of main ports in an external surface thereof so that combustion of the fuel takes place downstream of said external surface of said burner tip, the number and dimensions of said main ports in said external surface being such that the total area of the main ports in said external surface is at least 1 square inch per MMBtu/hr burner capacity.