Re-oriented over fire air ports for reduction of nox...

Details Re-oriented over fire air ports for reduction of nox... Re-oriented over fire air ports for reduction of nox...

F - Mech Eng,Light,Heat,Weapons

23

L

F23L 9/02 (2006.01) F23M 9/00 (2006.01)

Patent

CA 2508380

An over fire air (OFA) port arrangement for a pulverized coal-fired boiler or furnace has at least one OFA port through each of the sidewalls for injecting OFA to increase residence time for each burner level. Plural OFA ports may be employed, staggered both vertically and horizontally to effectively deliver over fire air to the burner flames at the appropriate time and location to most efficiently reduce the formation of fuel NO x. OFA port configurations for both single-wall and opposed- wall fired furnaces and boilers are provided.

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