Method and apparatus for treating absorbent solution slurry cont

Details Method and apparatus for treating absorbent solution slurry cont Method and apparatus for treating absorbent solution slurry cont

1990-11-21

1992-07-21

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

210749, 210765, 2105121, 423242, 423244, 423555, B01D 2126, C01B 1700

Patent

active

051320274

ABSTRACT:
In a wet lime desulfurization of exhaust gases containing SO.sub.2 and fly ash, a method and apparatus for treating absorbent solution slurry-containing fly ash includes diverting at least a part of the absorbent solution slurry containing fly ash particles, separating the diverted absorbent solution slurry by centrifugal separation into the solid gypsum component and a liquid component of a suspension containing fine fly ash particles, adjusting the pH value of the suspension containing fine fly ash particles remaining in a filtrate to 6 to 9 by adding an alkali, supplying the pH adjusted suspension to a thickener, removing concentrated sludge from the thickener, passing overflow H.sub.2 O from the thickener to a limestone slurry tank, and passing slurry from the limestone slurry tank to the absorbent solution slurry as make-up feed. Ill effects caused by fly ash and HF in exhaust gases are avoided, the activity of CaCo.sub.3 in the absorbent slurry is maintained, and highly pure gypsum is recovered.

REFERENCES:
patent: 4614545 (1986-09-01), Yoneda et al.
patent: 4632810 (1986-12-01), Shinodo et al.
patent: 4687648 (1987-08-01), Biolchini et al.
patent: 4687649 (1987-08-01), Kuroda et al.
patent: 4740362 (1988-04-01), Claerbout et al.

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