| 摘要 |
In a method for catalytic removal of nitrogen oxides from the flue gases of a heating system the nitrogen oxides are reduced to molecular nitrogen and water by the addition of ammonia to the flue gases and speeding up the reaction by means of a catalyst. With regard to this, the flue gases flow through one zone of the catalyst and the fresh air that is to be fed to the heating system as combustion air through a second zone separated from the first zone, the location of the respective zones through which the flue gases and the fresh air pass being continuously or gradually altered, so that the first zone through which the flue gases flow subsequently has fresh air flowing through it and vice-versa. The ammonia is added to the fresh air before it flows into the catalyst, is bonded to the surface of the catalytically active material and is entrained into the zone though which the flue gases flow, where reduction of the nitrogen oxides then takes place. <IMAGE>
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