System for controlling ammonia injection rate

Details System for controlling ammonia injection rate System for controlling ammonia injection rate

B - Operations, Transporting

01

D

23/429

B01D 53/34 (2006.01) B01D 53/86 (2006.01) G05D 11/13 (2006.01)

Patent

CA 1251320

ABSTRACT OF THE DISCLOSURE 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 NOx detection signal from an inlet NOx detector, a gas flow rate detection signal from a gas flow rate detector, and a leaked NH3 setting signal from a leaked NH3 setting unit; a leaked NH3 computing unit for computing a leaked NH3 computing signal from the inlet NOx detection signal from the inlet NOx detector, an outlet NOx detection signal from an outlet NOx detector, and the mole ratio signal from the mole ratio computing unit; and a com- parator for computing a leaked NH3 deviation signal from the leaked NH3 setting signal and the leaked NH3 computing signal, the leaked NH3 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.

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