Methods for enlarging the useful temperature window for NO.sub.x

Details Methods for enlarging the useful temperature window for NO.sub.x Methods for enlarging the useful temperature window for NO.sub.x

1991-04-05

1992-05-26

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C01B 2100

Patent

active

051165848

ABSTRACT:
Methods for reducing NO.sub.x emissions from stationary combustion systems having variable flue gas temperatures are disclosed. Use of an annonium salt of an organic acid enlarges the temperature window for effective selective noncatalytic NO.sub.x reduction thereby accounting for variable flue gas temperatures. Currently preferred ammonium salts of organic acids include ammonium formate, ammonium acetate, and ammonium oxalate. Mixtures of urea and either an ammonium salt of an organic acid or a metallic salt of an organic acid provide an even greater temperature window for NO.sub.x reduction. Currently preferred metallic salts of organic acids include Ca(COOH).sub.2, Ca(CH.sub.3 COO).sub.2, Ca(C.sub.2 H.sub.5 COO).sub.2, Mg(COOH).sub.2, Mg(CH.sub.3 COO).sub.2, and Mg(C.sub.2 H.sub.5 COO).sub.2.

REFERENCES:
patent: 3900554 (1975-08-01), Lyon
patent: 4208386 (1980-06-01), Arand et al.
patent: 4863704 (1989-09-01), Epperly et al.
patent: 4863705 (1989-09-01), Epperly et al.
patent: 5047219 (1991-09-01), Epperly et al.
Optimization of Reburning for Advanced NO.sub.x Control on Coil-Fired Boilers, Chen et al., Journal of the Air & Waste Management Association, vol. 39, No. 10, pp. 1375-1379, Oct. 1989.

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