J. Phys. IV France 107 (2003) 1287
Mercury speciation in the flue gas of a small-scale coal-fired boiler in Guiyang, PR ChinaS. Tang1, X. Feng1, L. Shang1, 2, H. Yan1, 2 and Y. Hou1, 2
1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
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 , Hg 2+, Hg 0, and Hg in flue gas before the WFGPD system, were 0.29 g/m 3, 0.64 g/m 3, 0.79 g/m 3 and 1.71 g/m 3, respectively, and the percentage of Hg , Hg 2+ and Hg 0 were 22.8%, 32.8% and 44.4% with regard to Hg , respectively. However, in the flue gas after thé WFGPD system, the average concentrations of Hg , Hg , Hg 0, and Hg were only 0. 07 g/m 3, 0.04 g/m 3, 0.58 g/m 3 and 0.69 g/m 3, respectively, and the percentage of Hg , Hg and Hg 0 with regard to Hg were 14.3%, 8.8% and 76.9%, respectively. The mean removal percentage of Hg and Hg by the WFGPD system, conceming Hg , was 93.8% and 74.2%. However, Hg 0 removal efficiency was only 25.8%. In the aggregate, the Hg removal efficiency was 57.2%.
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