Method and apparatus for the purification of gases which contain solid and gaseous impurities

A method for the purification of hot gases, especially industrial flue gases, comprising the steps of:

• (a) moistening the upward flowing hot gases in a pre-moistening stage by spraying them with a spray of downwards-directed scrubbing liquid obtained from a countercurrent cycle of the scrubbing liquid, flowing part of the scrubbing liquid into a vessel below the pre-moistening stage, nearly saturating the gases passing to the next stage with vaporized scrubbing liquid,
• (b) scrubbing and cooling the gases in the actual separation stage, in the venturi, by spraying the scrubbing liquid in a direction co-current to the gas flow, and also with spraying water directed tangentially to the entering gas flow, said water spray additionally rinsing a thin film of water onto the inner surface of the venturi, accumulating the gaseous impurities and solids absorbed into the scrubbing liquid and water into a vessel below the scrubbing stage, continuing the passage of the gases to the second scrubbing stage,
• (c) scrubbing the gases arriving in the second scrubbing stage, in the connecting channel, with fresh scrubbing liquid, producing gapless sprays, continuing the passage of the gases tangentially from the second scrubbing stage to the next stage and passing the scrubbing liquid flown into a vessel below the second separation stage into the venturi,
• (d) carrying the rising gases in the drop separation stage through a water film and passing them through several drop separation cylinders rinsed continuously with clean water, collecting the falling liquid drops and the water vapor still present in the gases into a vessel below the cylinders, and discharging the drop-free purified gases.