Flue gas desulphurisation with 2-stage separation, the 2nd stage being a wet electrostatic precipitator operated under alkaline conditions

摘要

The invention relates to a process for eliminating acid pollutants from flue gas desulphurisation plants according to the main application P 3248567.0. Since the exhaust gas is cooled to below the dew point in the wet scrubbing of the flue gas desulphurisation plant, and as a consequence corrosion can occur on the dry electrostatic precipitator, according to the invention it is proposed that the flue gas desulphurisation process comprises a wet, mechanical flue gas desulphurisation step (3) which is initially impinged, and a wet electrostatic precipitator (4) provided downstream. The electrostatic precipitator (4) is impinged with an alkaline washing solution (5), which is introduced into the mechanical washing step (3). <IMAGE>