Process for the wet treatment of an SO2- and HCl-containing combustion exhaust gas

摘要

The invention relates to a process for the wet treatment of an SO2- and HCl-containing combustion exhaust gas. In order to prevent an impairment of the desulphurisation performance and a growth promotion of the calcium sulphate deposits in the course of the process, the process according to the invention is characterised by: - determining the HCl content in the exhaust gas, - addition to the suspension circulating in an exhaust gas treatment tower a) of a sodium salt in an amount which at least corresponds to the HCl content determined, so that all of the HCl can be reacted in the exhaust gas treatment tower to form NaCl, and b) of CaCO3 or Ca(OH)2 which serves as absorbent for SO2 o