Patent ID: 8765089
Filing Date: 2014-07-01
Classification: B01D,F23J,Y02A

Abstract:
1. Process for reducing nitrogen oxides and halogenated organic compounds in an incineration plant having at least one combustion chamber, the process comprising: separating out fly ash using a dust collector; adding water to a first acid-operated scrubber and separating out hydrochloric acid; adding water and ammonia to a second neutral or slightly acid-operated scrubber so as to separate out sulphur dioxide and to form ammonium sulphite, a part of the ammonium sulphite being oxidized so as to form an aqueous ammonium sulphate and ammonium sulphite solution; and introducing the aqueous ammonium sulphate and ammonium sulphite solution into an oxygen-containing smoke gas at a temperature range from about 850° C. to about 1050° C. downstream of a secondary gas introduction area so as to decompose the ammonium sulphate and ammonium sulphite to form ammonia and sulphur dioxide which in turn reduce nitrogen oxides in the smoke gas with the ammonia and oxygen by selective non-catalytic reduction so as to produce nitrogen and water, a chloride-containing fly ash in the smoke gas thereby reacting with sulphur dioxide, water and oxygen so as to produce sulphates and hydrochloric acid.