ANLAGE ZUR REINIGUNG VON RAUCHGASEN MIT UNTERSCHIEDLICHEN GEHALTEN AN SAUREN KOMPONENTEN UND VERFAHREN ZUM BETRIEB DER ANLAGE

Apparatus to purify industrial waste gases, from power stations and waste incinerators, having varying acidic component contents, especially oxides of sulphur components and halogens, using alkaline rinse solutions, comprises a) a first flue gas wash tower with a wash liquid circuit, b) a subsequent second wash tower with a wash liquid circuit, and c) a quench for the flue gases to be purified. The quench is equipped with steam for a sufficient saturation of the flue gases, and the lower region is fitted out as an oxidation unit to oxidise the wash solution. Also claimed are (I) a process to selectively separate halogens and, (II) a process in which there is a concurrent pH 4-7 wash solution flow in the first wash tower to remove sulphur oxide, and a counter current pH 5-5.5 wash solution flow to remove the remaining sulphur oxides and to limit the ammonia concentration to at most 10 mg/Nm in the pure gas.