Sulphur di:oxide and nitrogen oxide absorption from power station gas - by forced contact with alkaline dust present and added absorbent

摘要

In the absorption of SO2 and NOx from pref. coal-fired power station waste gases, the absorption section is between the boiler and the electrofilter and is provided with wall scraper rings, Venturi inserts and/or displacers, which have raised areas or recesses splitting up the contact. These forcibly contact the alkaline dust, present naturally in the waste gas with the gas and absorb the SO2 and NOx. At the same time, according to the loading in the gas, more absorbent, e.g. Ca hydroxide is added to increase the absorption capacity and is sepd. with the natural dust in the electrofilter. The consumption of absorbent is reduced by a very simple technique, so that costs are ca 30% of the usual level.