Control of nox reduction in flue gas flows

Details Control of nox reduction in flue gas flows Control of nox reduction in flue gas flows

B - Operations, Transporting

01

D

B01D 53/34 (2006.01) B01D 53/56 (2006.01) B01D 53/86 (2006.01) F23J 15/00 (2006.01) B01D 53/36 (1990.01)

Patent

CA 2104320

CONTROL OF NOx REDUCTION IN FLUE GAS FLOWS ABSTRACT OF THE DISCLOSURE The NOx content in a flow of flue gas is reduced by passing the flue gas through a first treatment zone and a second treatment zone. A nitrogeneous treatment agent is introduced into the first treatment zone for the selective non-catalytic reduction of part of the NOx, and the flue gas is thereafter passed through the second treatment zone which includes a catalyst for further selective catalytic reduction of the NOx. Optionally, a second nitrogeneous treatment agent is added to the flue gas in the second treatment zone. The quantity of NOx in the flue gas is detected intermediate the first and second treatment zones and, optionally, after the flue gas has left the second treatment zone. The quantity of ammonia in the flue gas exiting from the second treatment zone is also detected. The amounts of the treatment agents added to the flue gas are controlled responsive to the variations and absolute levels determined by these measurements.

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