Method and device for the desulfurization and dust removal of exhaust gases, in particular in the refinery waste gases

摘要

The present invention relates to a process for the desulfurization and dust removal of exhaust gases, in particular in the refinery waste gases, in which the exhaust gas to be cleaned (16) a washing tower (1) above a scrubber sump (2) and for the deposition of such₂ and sour gases in a washing zone (4) of the scrubbing column (1) in countercurrent with an alkaline wash liquid (8) is washed from the scrubber bottom phase (2) is drawn off and spray nozzles (5) at the upper end of the washing zone (4) is fed to. In the scrubber bottom phase (2) are sulphites contained by gassing with air in the scrubber bottom phase (2) or in a the scrubber bottom phase (2) external device (10) is oxidized to sulfates. From the scrubber bottom phase (2), a suspension stream (12) is drawn off. According to the invention flows through the the washing zone (4) a gas leaving above the washing zone (4) is arranged in the scrubbing column (1) - wet electrostatic filter (13), wherein dust particles and aerosols on collecting electrodes (14) of the wet - electrostatic filter (13) are deposited. The collecting electrodes (14) with a washing liquid part stream (17) periodically rinsed, which consists of the scrubber bottom phase (2) is removed at the head of the wet - electrostatic filter (13) is applied and then into the scrubber bottom phase (2). The present invention also relates to a plant for carrying out the method.