Apparatus and method for reduction of NOx emissions from a fluid

Details Apparatus and method for reduction of NOx emissions from a fluid Apparatus and method for reduction of NOx emissions from a fluid

1980-04-09

1982-01-05

Yuen, Henry C.

Furnaces

Process

Burning pulverized fuel

431 10, 122 4D, F23M 304, F23K 100

Patent

active

043088104

ABSTRACT:
Apparatus and method for the reduction of nitrogen oxides (NOx) in the emissions of a fuel burning fluidized bed combustion system. Using a staged combustion technique, an overfire air inlet is provided in the freeboard zone above the bed. In the first stage, residual oxygen (O.sub.2) in the off-gas just above the bed is held in the 0.4 to 0.8% range by the actual coal and air rates. In the second stage, carbon monoxide (CO) and unburned hydrocarbons, both present in the first stage off-gas, are combined with additional air using the overfire air inlet. CO levels in the final effluent are reduced with little or no increase in NOx emissions.

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patent: 3119378 (1964-01-01), Marshall
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patent: 4021186 (1977-05-01), Tennev
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patent: 4054407 (1977-10-01), Carrubba et al.
patent: 4116005 (1978-09-01), Willyoung
patent: 4246853 (1981-01-01), Mehta

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