Furnaces – Utilizing powdered fuel – Having rotary flow means
Patent
1996-06-17
1997-11-25
Bennett, Henry A.
Furnaces
Utilizing powdered fuel
Having rotary flow means
110345, 431 5, 431 8, F23D 102, F23J 1502
Patent
active
056900392
ABSTRACT:
A method and apparatus are described for reducing NO.sub.x in a combustion zone such as a boiler by spatially selectively injecting a cooling fluid into the combustion zone so that the fluid is entrained to intersect an identifiable NO.sub.x producing zone. The cooling fluid can be water or a gas or mixture of them and whose temperature is sufficiently low or whose combined mass flow and temperature are sufficiently low so that the cooling fluid can reach the NO.sub.x producing zone and cool it to a temperature where the NO.sub.x production is significantly reduced. In one embodiment of the invention a cyclone boiler has a number of identifiable NO.sub.x producing zones. Several of these are targeted by spatially distinct cooling fluid streams placed at strategic locations. At one location the cooling fluid such as a water spray is placed in a duct in the path of the secondary air to deliver a cooling secondary air stream or a combination thereof with a hot flue gas and which is shaped to correspond in cross-section to that of the NO.sub.x producing zone targeted by the cooling fluid. Significant NO.sub.x reduction is achieved.
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Marx Peter D.
Monro Richard J.
Bennett Henry A.
RJM Corporation
Wilson Gregory
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