Sodium-limestone double alkali flue gas desulfurization...

Details Sodium-limestone double alkali flue gas desulfurization... Sodium-limestone double alkali flue gas desulfurization...

B - Operations, Transporting

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B01D 53/14 (2006.01) B01D 53/18 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01)

Patent

CA 1261119

ABSTRACT: A method for improving utilization of limestone in a sodium-limestone double alkali flue gas desulfuriza- tion process. Spent alkaline absorber solution, con- taining sodium sulfite and sodium bisulfite, is diverted for regeneration treatment in a series of stirred tank reactors, where it is contacted with the limestone regenerating agent. Dilute slurry from the last reactor is concentrated in a thickener, and the concentrated underflow slurry from the thickener is then treated further in an after-reactor circuit. Since the thickener underflow slurry contains residual unreacted limestone, the slurry is contacted with a side stream of spent alkaline absorber solution in the after-reactor circuit to promote further reaction of residual limestone before the solids are separated and discarded.

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