Process of decreasing NO.sub.x content of exhaust gases

Details Process of decreasing NO.sub.x content of exhaust gases Process of decreasing NO.sub.x content of exhaust gases

1990-12-18

1992-08-11

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423244, C01B 2100, C01B 1700, B01J 800

Patent

active

051377047

ABSTRACT:
For a decrease of NO.sub.x content in the exhaust gases from cement-burning kilns by an addition of ammonia and/or ammonia-containing substances to hot exhaust gases, the exhaust gases are desulfurized at a temperature from 50.degree. to 100.degree. C. in a dry or semidry process by a mixture of raw cement powder and calcium hydroxide, and the mixed solids which have been removed the exhaust gas in a dry state in the desulfurizing stage are returned to the exhaust gas stream when it is at a temperature from 850.degree. to 1,000.degree. C.

REFERENCES:
patent: 4469664 (1984-09-01), Abelitis et al.
patent: 4634583 (1987-01-01), Wolter et al.

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