Method and system for removing mercury from flue gas

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/64 (2006.01) B01D 53/50 (2006.01) B01D 53/77 (2006.01) B01D 53/86 (2006.01)

Patent

CA 2577826

A facility for treating an exhaust gas having a boiler and a desulfurization apparatus for desulfurizing the exhaust gas from the boiler, which comprises a biomass supply means for supplying a biomass containing a chlorine component to the above boiler, a hydrogen chloride monitor for the measurement of the hydrogen chloride content of an exhaust gas to be supplied to the above desulfurization apparatus and a mercury monitor for the measurement of the mercury content of an exhaust gas discharged from the above desulfurization apparatus, and can control the amount of the above biomass to be supplied which is proportional to the chlorine amount allowing the removal of mercury by the hydrogen chloride component in the above desulfurization apparatus, based on the measured values of the above hydrogen chloride monitor and the mercury monitor. The above facility provides a system and a method for removing mercury in an exhaust gas, which can be practiced without detriment to the combustion efficiency of a boiler, without the increase of combustion residue and with a reduced cost for the removal.

L~invention concerne un équipement de traitement d~un gaz d~échappement ayant une chaudière et un appareil de désulfuration permettant de désulfurer le gaz d~échappement provenant de la chaudière, comprenant un moyen d~injection de biomasse pour injecter une biomasse contenant un composant de chlore dans la chaudière ci-dessus, un moniteur de chlorure d~hydrogène pour mesurer la teneur en chlorure d~hydrogène d~un gaz d~échappement à injecter dans l~appareil de désulfuration ci-dessus et un moniteur de mercure pour mesurer la teneur en mercure d~un gaz d~échappement déchargé de l~appareil de désulfuration ci-dessus, et capable de contrôler la quantité de la biomasse ci-dessus à injecter, qui est proportionnelle à la quantité de chlore permettant d~enlever le mercure à l~aide du composant de chlorure d~hydrogène dans l~appareil de désulfuration ci-dessus, sur la base des valeurs de mesure du moniteur de chlorure d~hydrogène ci-dessus et du moniteur de mercure. L~équipement ci-dessus constitue un système mettant en AEuvre un procédé d~enlèvement de mercure dans un gaz d~échappement, ledit procédé étant réalisé sans nuire à l~efficacité de combustion d~une chaudière, sans augmenter les résidus de combustion et en abaissant les coûts d~enlèvement.

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