FGD performance enhancement by hydroclone and recycling steps

Details FGD performance enhancement by hydroclone and recycling steps FGD performance enhancement by hydroclone and recycling steps

1993-03-08

1994-05-03

Drodge, Joseph W.

Liquid purification or separation

Processes

Separating

55228, 95195, 2101951, 210259, 210787, 210805, 210806, 422168, 422234, 42324311, B01D 17038, B01D 5000

Patent

active

053085094

ABSTRACT:
A flue gas desulfurization process wherein the liquid bottoms product from the scrubber tower is subject to forced oxidation in a reaction/oxidation tank. Afterwards, this oxidized bottoms product is delivered to hydroclone means for separation into an overflow stream containing an aqueous slurry of mostly fines, fly ash, and unused reagent and an underflow stream containing predominately a gypsum slurry. The overflow stream is initially recycled back to the tank with another stream being subsequently returned or recycled back to the scrubber tower while the underflow stream is dewatered for the removal of the gypsum therein.

REFERENCES:
patent: 4046856 (1977-09-01), Itoo et al.
patent: 4431608 (1984-02-01), Katagiri et al.
patent: 4515754 (1985-05-01), Stehning
patent: 4853195 (1989-08-01), Lehto
patent: 4976936 (1990-12-01), Rathi et al.
patent: 4986966 (1991-01-01), Lehto
patent: 4996032 (1991-02-01), Stowe et al.

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