Catalytic denitrification control process and system for combust

Details Catalytic denitrification control process and system for combust Catalytic denitrification control process and system for combust

1989-03-27

1991-09-10

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423235, 422 62, B01J 800, C01B 2100, G01N 2100

Patent

active

050472208

ABSTRACT:
A control process and system for catalytic denitrification of NO.sub.x containing flue gases derived from a fuel combustion unit such as a gas turbine by ammonia addition to the flue gas upstream of a catalytic denitrification unit. The ammonia addition rate is controlled based on a basic signal which is generated based on functional parameters including the fuel being burned, its combustion temperature, flue gas flow rate, ammonia flow rate and the catalytic activity, so as to inject initially into the flue gas stream less ammonia than is theoretically required. Then the NO.sub.x concentration in the exhaust gas downstream of the catalytic unit is compared with the appropriate standard, the ammonia quantity initially being added is further adjusted until the NO.sub.x concentration is gas emitted to the atmopshere is reduced sufficiently to meet local clean air standards while avoiding unsatisfactory excess ammonia injection and system oscillation.

REFERENCES:
patent: 4473536 (1984-09-01), Carberg et al.
patent: 4473537 (1984-09-01), Ford et al.
patent: 4565679 (1986-01-01), Michalak et al.

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