Method and apparatus for reducing nox emissions in a gas burner

F - Mech Eng,Light,Heat,Weapons – 23 – D

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F23D 14/62 (2006.01) F23C 9/00 (2006.01)

Patent

CA 2632012

A method and apparatus for reducing NO x emissions in a gas burner in which the burner includes a burner supply for supplying fuel gas and primary air to the furnace and projecting the fuel gas into the furnace, a secondary air supply for supplying secondary air to the burner, and a recirculating device for mixing the secondary air with the spent gases inside the furnace, which is then recirculated and combusted to reduce NO x gases. The method of the invention includes the steps of supplying fuel gas and primary air to the furnace, projecting the fuel gas into the furnace, combusting the fuel gas and primary gas to produce spent gases, supplying secondary air to the furnace, mixing the secondary air with the spent gases inside the furnace to produce diluted air, and recirculating and combusting the diluted air with the fuel gas and primary air to reduce NO x emissions.

Divulgation d'une méthode et d'un appareil pour réduire les émissions de NOx d'un brûleur à gaz. Le brûleur est muni d'un dispositif d'alimentation pour amener et projeter le combustible et l'air primaire dans l 'appareil de combustion, d'un dispositif d'alimentation en air secondaire du brûleur et d'un dispositif de recirculation pour mélanger l'air secondaire aux émissions de combustion à l'intérieur de l'appareil de combustion, qui sont ensuite recirculés et brûlés de pour réduire la concentration des NOx. La méthode divulguée comprend des étapes suivantes : alimentation de l'appareil de combustion en gaz et en air primaire de combustion, projection du gaz de combustion dans l'appareil, combustion du gaz de combustion et du gaz primaire pour produire des émissions, introduction de l'air secondaire dans l'appareil de combustion, mélange de l'air secondaire et des émissions dans l'appareil de combustion pour produire de l'air dilué, recirculation et combustion de l'air dilué avec le gaz de combustion et l'air primaire afin de réduire les émissions de NOx.

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