Washing tower for the desulfurization of flue gases

Details Washing tower for the desulfurization of flue gases Washing tower for the desulfurization of flue gases

B - Operations, Transporting

01

D

165/3, 23/349

B01D 53/18 (2006.01) B01D 53/50 (2006.01) C01F 11/46 (2006.01)

Patent

CA 1206727

ABSTRACT OF THE DISCLOSURE A scrubber is provided with a grate in its sump through which oxygen is introduced to separate the oxidation zone above this grate from a reaction zone below the grate, a calcium containing additive being introduced into this reaction zone. Flue gas to be desulfurized is passed through a washing zone above the sump and there contacted with normally scrubbing liquid containing the additive to absorb sulfur dioxide and sulfur trioxide. The sulfur dioxide is oxidized to sulfur trioxide and the additive induces precipitation of calcium sulfate in the sump. After a prolonged standstill, settled solids in the sump are induced into movement by drawing a portion of the sump liquid from an upper part thereof and injecting it into a lower part of the sump.

428946

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