Furnaces – Utilizing powdered fuel – Having rotary flow means
Patent
1993-08-18
1994-09-06
Yuen, Henry C.
Furnaces
Utilizing powdered fuel
Having rotary flow means
110347, 122 4D, F23D 102
Patent
active
053438205
ABSTRACT:
An advanced overfire air system for NO.sub.x control designed for use in a firing system of the type that is particularly suited for use in fossil fuel-fired furnaces and a method of operating such a furnace which embodies an advanced overfire air system. The advanced overfire air system for NO.sub.x control includes multi-elevations of overfire air compartments consisting of a plurality of close coupled overfire air compartments and a plurality of separated overfire air compartments. The close coupled overfire air compartments are supported at a first elevation in the furnace and the separated overfire air compartments are supported at a second elevation in the furnace so as to be spaced from but aligned with the close coupled overfire air compartments. Overfire air is supplied to both the close coupled overfire air compartments and the separated overfire air compartments such that there is a predetermined most favorable distribution of overfire air therebetween, such that the overfire air exiting from the separated overfire air compartments establishes a horizontal "spray" or "fan" distribution of overfire air over the plan area of the furnace, and such that the overfire air exits from the separated overfire air compartments at velocities significantly higher than the velocities employed heretofore.
REFERENCES:
patent: 4715301 (1987-12-01), Bianca et al.
patent: 4962711 (1990-10-01), Yamauchi et al.
patent: 5020454 (1991-06-01), Hallewell
Combustion Engineering Inc.
Fournier, Jr. Arthur E.
Yuen Henry C.
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