After-air nozzle for two-stage combustion boiler, and a...

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

Patent

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F23L 9/00 (2006.01) F23L 3/00 (2006.01) F23N 3/00 (2006.01)

Patent

CA 2524760

Object: This invention provides an after-air nozzle and a boiler having thereof capable of reducing NOx and CO at the same time. Means for achieving the object: This invention is characterized in that it has a vena contracta such that an outside diameter of a flow passage diminishes towards the air-jetting port which supplies air to a boiler, and a changing apparatus of a flow passage cross-sectional area to change a flow passage cross-sectional area of the vena contracta. Advantageous effect: Using the after-air nozzle of this invention makes it possible to reduce NOx and CO concentrations at the same time.

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