Removal of nitrogen oxides and sulfur oxides by ammonia

Details Removal of nitrogen oxides and sulfur oxides by ammonia Removal of nitrogen oxides and sulfur oxides by ammonia

1980-08-29

1981-09-08

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423244, B01D 5336

Patent

active

042884209

ABSTRACT:
When exhaust gas from a coal-burning boiler containing NO.sub.x as well as SO.sub.x is subjected to NO.sub.x removal by catalytic reduction of the NO.sub.x with ammonia and the coal ashes contained in the gas are separated, the coal ashes are contaminated by a certain quantity of ammonium compounds produced from the SO.sub.x and the ammonia excessively used. The ammonium compounds in the coal ashes are decomposed into ammonia and a sulfur compound by heating by the hot gas at a temperature in the restricted range, viz. 350.degree. to 700.degree. C., thereby to release ammonia into the gas preferentially to the sulfur compound. The ammonia thus released is recycled to the NO.sub.x removal step.

REFERENCES:
patent: 4141959 (1979-02-01), Kato et al.

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