Abstract
Chemical speciation of mercury in the flue gas of a boiler with wet flue gas precipitator and desulfurization (WFGPD) system were studied by using Ontario Hydro Mercury Speciation Method. The average concentrations of Hg p , Hg 2+ , Hg 0 , and Hg t in flue gas before the WFGPD system, were 0.29 μg/m 3 , 0.64 μg/m 3 , 0.79 μg/m 3 and 1.71 μg/m 3 , respectively, and the percentage of Hg p , Hg 2+ and Hg 0 were 22.8%, 32.8% and 44.4% with regard to Hg t , respectively. However, in the flue gas after the WFGPD system, the average concentrations of Hg p , Hg 2+ , Hg 0 , and Hg t were only 0.07 μg/m 3 , 0.04 μg/m 3 , 0.58 μg/m 3 and 0.69 μg/m 3 , respectively, and the percentage of Hg p , Hg 2+ and Hg 0 with regard to Hg t were 14.3%, 8.8% and 76.9%, respectively The mean removal percentage of Hg 2+ and Hg p by the WFGPD system, concerning Hg t , was 93.8% and 74.2%. However, Hg 0 removal efficiency was only 25.8%. In the aggregate, the Hg t removal efficiency was 57.2%.
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