COMBINED NON-CATALYTIC REDUCTION OF NO_X AND SO_2 BY AMMONIA LIQUOR DURING STAGED FLUIDIZED-BED

摘要

Emissions of NO_X and SO_2 were monitored inthe presence of ammonia liquor in a 0.09 m~2 and 2 m high stainless-steel fluidized-bed combustor. Experiments were carried out at 2 m/s fluidizing velocity, 40/100 excess air, and 870 deg C bed temeprature. Ammonia liquor with 7/100 ammonia by weight was injected into the freeboard of the combustor 52 cm above the distributor through a water-cooled injector. A 65:34 primary/secondary air ratio was maintained throughout the investigation. Approximately 70/100 of NO and 20/100 of SO_2 was reduced at an NH_3/NO molar ratio of 2:1, respectively.