Acid Gas Removal
Semi-Dry FGT systems
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In semi-dry scrubbing, the flue gases are introduced into an absorbing tower (dryer) where the gases are contacted with a finely atomized alkaline slurry : usually a calcium-based sorbent such as Ca(OH)2 or CaO. Acid gases are absorbed by the slurry droplets and react to form solid salts. The heat of the flue gas is used to evaporate all the water droplets, with a non-saturated (i.e. dry) flue gas leaving the absorber tower. The effect of cooling and humidifying the hot gas stream increases collection efficiency |
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