Apparatus for removing NO.sub.x from a gas

Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element responds proportionally to a variable signal...

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422168, 364500, G05D 700, B01D 5334

Patent

active

047510544

ABSTRACT:
An ammonia injection rate to an apparatus for catalytically removing nitrogen oxides from a combustion flue gas in the presence of ammonia, provided in a flue gas passage, is controlled in accordance with changes in load by a system comprising a mole ratio computing unit for computing a mole ratio signal from a gas temperature signal from a gas temperature dector, an inlet NO.sub.x detection signal from an inlet NO.sub.x detector, a gas flow rate detection signal from a gas flow rate detector, and a leaked NH.sub.3 setting signal from a leaked NH.sub.3 setting unit; a leaked NH.sub.3 computing unit for computing a leaked NH.sub.3 computing signal from the inlet NO.sub.x detection signal from the inlet NO.sub.x detector, an outlet NO.sub.x detection signal from an outlet NO.sub.x detector, and the mole ratio signal from the mole ratio computing unit; and a comparator for computing a leaked NH.sub.3 deviation signal from the leaked NH.sub.3 setting signal and the leaked NH.sub.3 computing signal, the leaked NH.sub.3 deviation signal being added to the mole ratio signal, thereby obtaining a mole ratio-correcting signal, and an ammonia injection rate being controlled by the mole ratio correcting signal.

REFERENCES:
patent: 3977836 (1976-08-01), Matsuda et al.
patent: 4302205 (1981-11-01), Muraki et al.
patent: 4302419 (1981-11-01), Abrams et al.
patent: 4473536 (1984-09-01), Carberg et al.
patent: 4473537 (1984-09-01), Ford, Jr. et al.
patent: 4565679 (1986-01-01), Michalak et al.

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