METHOD FOR REDUCING NOx IN A COMBUSTION PROCESS

摘要

The invention relates to a method for reducing emission of NOx in a combustion process in pressurized fluidized bed (11) with added absorbent, for example limestone or dolomite. Ammonia or another substance containing nitrogen or a substance producing ammonia or nitrogen is injected into the flue gas in order to react with the flue gas components in an initial zone (23) comprising a free space in which the flue gas and dust particles suspended therein are maintaining, and then in a second zone (20) in which the ammonia is brought in contact with a solid surface achieved by concentration of the dust particles.