Patent ID: 6082993
Filing Date: 2000-07-04
Classification: B01F,F23D,F23L,F23N

Abstract:
A fuel/air mixture control system for a draft induction furnace having a burner conduit equipped with a plurality of outlet apertures for emitting a mixture of fuel and air to be burned and an inlet aperture for admitting air, comprising:a fuel nozzle for injecting fuel into the burner conduit, said fuel nozzle having an elongated portion with a substantially cylindrical shape and a fuel inlet at one end, said fuel inlet communicating with an internal lumen in said elongated portion, said lumen being blind at an end of said nozzle distal to said fuel inlet, said elongated portion having a peripheral land disposed thereabout proximate said blind end, said land having an outer surface which is substantially cylindrical and which is positioned substantially coaxially relative to said elongated portion, said outer surface of said land having a diameter which is larger than that of said elongated portion and having at least one fuel outlet orifice therein communicating with said lumen and positioned to discharge fuel at an angle having a component perpendicular to a longitudinal axis of said nozzle;a blower for drawing air into the inlet aperture of the burner conduit; andan air flow constrictor proximate the inlet aperture of the burner conduit, said constrictor increasing the velocity of said inlet air proximate said outlet orifice of said fuel nozzle and increasing the volume of fuel injected into the burner conduit.