Low NOX burner
AssigneeSelas Corporation of America
InventorsHoward Seemann, Chad F. Gottschlich
Life of this patent
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Abstract
A controlled primary air inspirating gas burner is provided with a fuel inspirating jet and an induced primary air passageway, with a means forming a separate control primary air passageway, together with means for controlling the introduction of control primary air. The content of nitrogen oxides in the flue gas is substantially reduced by introduction of regulated amounts of control primary air into the burner.
Claims19
A controlled primary air inspirating gas burner comprising:
- a burner body having a burner tip adapted to be installed in a furnace or the like for combustion of gaseous fuel therein,
- a fuel inspirating jet positioned in said body upstream of said tip and having an open gaseous fuel orifice for introduction of gaseous fuel into said burner body,
- means for supplying gaseous fuel under pressure to said inspirating jet,
- means forming an induced primary air passageway upstream of said burner tip for flow of induced primary air into said body for mixing with said gaseous fuel prior to exiting said burner tip,
- means forming a separate control primary air passageway located upstream of said induced primary air passageway and extending into said burner body adjacent said inspirating jet for separately introducing control primary air into said body,
- pressure means connected to introduce said control primary air into said fuel inspirating jet, and
- separate control means for controlling the rate of introduction of said control primary air into said burner body, whereby the NOx content of the resulting flue gas can be reduced in the absence of secondary air.
In a method of reducing the NOx content of flue gas in a furnace fired by a burner extending through a furnace wall, said burner introducing gaseous fuel at an upstream location and induced primary air at a downstream location for combustion within said furnace, the steps which comprise:
- (a) separately introducing into said burner under pressure a separate stream of control primary air upstream of said downstream location for admixture with said gaseous fuel, and
- (b) controlling the rate of introduction of said separate stream of control primary air.
Dependencies are inferred from the claim text.