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Numéro
J. Phys. IV France
Volume 107, May 2003
Page(s) 1287 - 1290
DOI https://doi.org/10.1051/jp4:20030536


J. Phys. IV France 107 (2003) 1287
DOI: 10.1051/jp4:20030536

Mercury speciation in the flue gas of a small-scale coal-fired boiler in Guiyang, PR China

S. 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


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 $^{\rm p}$, Hg 2+, Hg 0, and Hg $^{\rm t}$ in flue gas before the WFGPD system, were 0.29  $\mu$g/m 3, 0.64  $\mu$g/m 3, 0.79  $\mu$g/m 3 and 1.71  $\mu$g/m 3, respectively, and the percentage of Hg $^{\rm p}$, Hg 2+ and Hg 0 were 22.8%, 32.8% and 44.4% with regard to Hg $^{\rm t}$, respectively. However, in the flue gas after thé WFGPD system, the average concentrations of Hg $^{\rm p}$, Hg $^{\rm 2+}$, Hg 0, and Hg $^{\rm t}$ were only 0. 07  $\mu$g/m 3, 0.04  $\mu$g/m 3, 0.58  $\mu$g/m 3 and 0.69  $\mu$g/m 3, respectively, and the percentage of Hg $^{\rm p}$, Hg $^{\rm 2+}$ and Hg 0 with regard to Hg $^{\rm t}$ were 14.3%, 8.8% and 76.9%, respectively. The mean removal percentage of Hg $^{\rm 2+}$ and Hg $^{\rm p}$ by the WFGPD system, conceming Hg $^{\rm t}$, 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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