PROCESS FOR REMOVING SULPHUR DIOXIDE FROM FLUE GASES , IN PARTICULAR FROM POWER STATION EXHAUST GASES AND EXHAUST GASES FROM WASTE INCINERATING PLANTS

摘要

The invention relates to a process for removing SO2 from flue gas, wherein the flue gas is treated with an absorption fluid in the washing zone of a washer-scrubber in the countercurrent. In accordance with the invention, the absorption fluid consists of a mixture of ammonia water, a ammonium sulphite-containing fluid which is drawn off from the washer-scrubber below the washing zone and returned without intermediate treatment, and an ammonium sulphate solution which is returned from an oxidation device. The mixture ratio between the ammonium sulphite and the ammonium sulphate is in the range between 15 : 1 and 3:1.