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This study focused on the performance of the newly developed hybrid lter system to capture ne particulatematter and mercury compounds in a coal-fired power plant. The hybrid filter system combining bag-filter andelectrostatic precipitator had been developed to remove ne particulate matter. However, it would have a goodperformance to control mercury compounds as well. In Hybrid lter capture system, the total removal efciency oftotal mercury compounds consisting of particulate mercury(Hg p ), oxidized mercury(Hg 2 + ), and elemental mercury(Hg 0 ) was 66.2%. The speciation of mercury compounds at inlet and outlet of Hybrid lter capture system were1.3% and 0% of Hg p , 85.2% and 68.1% of Hg 0 , and 13.5% and 31.9% of Hg 2 + , respectively. In hybrid lter capturesystem injected with 100% of ue-gas, the removal efciency of total mercury was calculated to increase to 93.5%. Key words : Particulate matter, Particulate mercury, Oxidized mercury, Hybrid lter, Mercury removal efciency

Performance of Removal Efficiency for Mercury Compounds using Hybrid Filter System in a Coal-fired Power Plant