Fgd performance enhancement by hydroclone

B - Operations – Transporting – 01 – D

Patent

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B01D 21/26 (2006.01) B01D 50/00 (2006.01) B01D 53/18 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01) B04C 5/00 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2117146

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 subsequently returned or recycled back to the scrubber tower while the underflow stream is dewatered for the removal of the gypsum therein.

Procédé de désulfuration des gaz de carneau dans lequel le produit de fond liquide provenant de la tour à garnissage subit une oxydation forcée dans un réservoir de réaction/d'oxydation. Par la suite, le produit de fond oxydé est envoyé à un hydrocyclone pour être séparé en une surverse contenant une suspension aqueuse composée surtout de fines, de cendres volantes, et de réactif inutilisé, et en une sousverse contenant de manière prédominante une suspension de plâtre. La surverse est subséquemment retournée ou recyclée à la tour à garnissage, tandis que la sousverse est asséchée pour récupérer le plâtre.

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