| 摘要 |
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<3> in the pure gas. |
