초록

A burner and combustion method employing oxygen or oxygen-enriched air as the oxidant comprising a low velocity fuel stream in proximity to high velocity main fuel within a combustion zone enabling efficient combustion with a stable flame at very high fuel velocities.

대표청구항 ▼

A method for combusting gaseous fuel and oxidant comprising: (A) injecting into a combustion zone the major portion of the gaseous fuel required for the combustion as at least one stream at a high velocity V which is greater than 5P where P is the volume percent oxygen in the oxidant and V is in fee

A method for combusting gaseous fuel and oxidant comprising: (A) injecting into a combustion zone the major portion of the gaseous fuel required for the combustion as at least one stream at a high velocity V which is greater than 5P where P is the volume percent oxygen in the oxidant and V is in feet per second; (B) injecting into said combustion zone in proximity to the major fuel, a minor portion of the gaseous fuel required for the combustion, said minor portion comprising at least 1 percent of the total gaseous fuel injected into the combustion zone, at a low velocity less than 0.5 V; (C) injecting oxidant, comprising at least 30 percent oxygen, into the combustion zone in proximity to the minor fuel to form an interface between said oxidant and said minor fuel, at a velocity such that the low velocity of the minor fuel is within 200 feet per second of the velocity of the oxidant at the interface; (D) combusting minor fuel with oxidant at the interface; (E) entraining minor fuel into the high velocity major fuel immediately after injection of the major fuel into the combustion zone and thereafter entraining oxidant into the high velocity major fuel; and (F) drawing hot combustion products from the interface into the high velocity major fuel, said hot combustion products serving as a continuous source of ignition for the oxidant and major fuel, and combusting oxidant and high velocity major fuel in a stable flame. Burner apparatus for use with pure oxygen or oxygen-enriched air as the oxidant comprising: (A) means for providing major fuel for injection into a combustion zone said major fuel provision means comprising a central fuel supply tube and a nozzle at the injection end of the supply tube, said nozzle having at least one orifice therethrough for passage of gaseous fuel from the supply tube into the combustion zone; (B) an annular opening around the nozzle for providing minor fuel to the combustion zone in proximity to the major fuel injection so that minor fuel is entrained into major fuel immediately after injection of major fuel into the combustion zone, said annular opening connected by conduit means to a source of gaseous fuel; and (C) means for providing oxidant to said combustion zone in proximity to the minor fuel provision means, said oxidant provision means connected by conduit means to a source of oxidant comprising at least 30 volume percent oxygen, so that said oxidant and minor fuel form an interface within the combustion zone prior to contact between oxidant and major fuel.