Exhaust gas treating method

B - Operations – Transporting – 01 – D

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Details

B01D 53/50 (2006.01) B01D 53/34 (2006.01) B01D 53/64 (2006.01) B01D 53/77 (2006.01)

Patent

CA 2680175

A method of treating an emission gas, comprising bringing an emission gas containing at least sulfur dioxide and mercury into contact with an absorbent liquid to thereby remove the sulfur dioxide from the emission gas, wherein persulfuric acid is added to the absorbent liquid. Alternatively, an iodine gas is added to the emission gas, and the resultant gas is brought into contact with an absorbent liquid of wet flue gas desulfurization equipment. Accordingly, there can be provided a method of treating an emission gas in which even when fluctuations occur in power generation load and emission gas composition, a high rate of removal of sulfur dioxide and mercury can be stably maintained over a prolonged period of time.

L'invention concerne un procédé destinés à traiter un gaz d'émission, qui consiste à amener un gaz d'émission contenant au moins du dioxyde de soufre et du mercure en contact avec un liquide absorbant afin d'éliminer le dioxyde de soufre de ce gaz, de l'acide persulfurique étant ajouté au liquide absorbant. Par ailleurs, de l'iode est ajouté au gaz d'émission, et le gaz obtenu est mis en contact avec un liquide absorbant dans un appareil de désulfurisation de gaz de combustion par voie humide. L'invention concerne également un procédé de traitement d'un gaz d'émission dans lequel même lorsque des fluctuations surviennent dans la charge de production d'énergie et dans la composition du gaz d'émission, un taux élevé d'élimination du dioxyde de soufre et du mercure peuvent être maintenus de manière stable durant une période prolongée.

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