Analysis of Mercury Species and Thermal Stability of Desulphrized Gypsum in Coal-fired Boiler

doi:10.11930/j.issn.1004-9649.2013.9.145.4

Abstract

Abstract: Identifying the Hg species and release characteristics have guiding significance for WFGD gypsum utilization. The X-ray fluorescence spectrometry(XRF) was used to make the composition analysis of the two gypsum samples of the coal-fired power plant. In order to determine the thermostability and species distribution of Hg in gypsum, the gypsum sample and gypsum residue sample were heated by two heating method and the gypsum weight loss and Hg contents were measured after heating treatment. The results show that the Hg release began at 100 ℃ and 200 ℃ respectively for the two gypsum samples; the rapid release occurred at the temperature between 200 ℃ and 400 ℃; the Hg release finished at 500 ℃for all the gypsum samples; the Hg in gypsum residue decreased and the main Hg compounds in WFGD were HgCl₂ and HgS.

Key words: coal-fired plant, wet flue gas desulphurization (WFGD), desulphrized gypsum, mercury

CLC Number:

X773

YIN Li-bao, GAO Zheng-yang, ZHONG Jun, ZHENG Shuang-qing, CHEN Chuan-min. Analysis of Mercury Species and Thermal Stability of Desulphrized Gypsum in Coal-fired Boiler[J]. Electric Power, 2013, 46(9): 145-149.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.9.145.4

https://www.electricpower.com.cn/EN/Y2013/V46/I9/145

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