Low NOx premix burner apparatus and methods
AssigneeJohn Zink Company
InventorsDemetris Venizelos, R. Robert Hayes, Richard T. Waibel, Wesley R. Bussman
Life of this patent
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Abstract
Low NOx axial premix burner apparatus and methods for burning fuel gas are provided by the present invention. The methods of the invention are basically comprised of the steps of mixing a first portion of the fuel gas and all of the air to form a lean primary fuel gas-air mixture, discharging the lean primary fuel gas-air mixture into the furnace space whereby the mixture is burned in a primary combustion zone therein, discharging a second portion of the fuel gas into the primary combustion zone to stabilize the flame produced therein and discharging the remaining portion of the fuel gas into a secondary combustion zone in the furnace space.
Claims8
A method of discharging an at least substantially stoichiometric mixture of fuel gas and air into a furnace space wherein said mixture is burned and flue gases having low NOx content are formed therefrom comprising the steps of:
- (a) mixing a first portion of said fuel gas and all of said air to form a lean primary fuel gas-air mixture;
- (b) discharging said lean primary fuel gas-air mixture into said furnace space whereby said mixture is burned in a primary combustion zone therein and flue gases having low NOx content are formed therefrom, whereby said furnace space substantially encompasses said primary combustion zone;
- (c) providing a flame stabilizing block in said furnace space positioned so that the flame produced by the burning of said lean primary fuel gas-air mixture therein impinges on said flame stabilizing block and is stabilized thereby:
- (d) discharging a second portion of said fuel gas into said primary combustion zone whereby said second portion of said fuel gas is mixed with a portion of said air and is burned to stabilize said flame produced therein;
- and
- (e) discharging the remaining portion of said fuel gas into a secondary combustion zone in said furnace space, whereby said furnace space encompasses said secondary combustion zone, wherein said remaining portion of said fuel gas mixes with air remaining in said furnace space and with flue gases contained therein to form a second fuel gas-air mixture diluted with flue gases whereby said mixture is burned in said secondary combustion zone and additional flue gases having low NOx content are formed therefrom.
Dependencies are inferred from the claim text.