METHOD AND PLANT FOR FLUE GAS DE-NOXING

摘要

The invention relates to a method for depleting nitrogen oxides from an oxygen-containing gas stream. The gas stream is brought into contact with a scrubbing solution containing ammonia and ammonium sulphite in a NO2 reduction, whereby NO2 is reduced to N2. NO is reacted with ammonia and oxygen to form ammonium nitrite in an NO elimination step which proceeds at elevated pressure. Likewise, the invention also relates a plant for operating the method according to the invention.