Effects of Fly Ash Components on Mercury Removal in Flue Gas

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  • Takaoka Masaki
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University
  • Takeda Nobuo
    Department of Environmental Engineering, Graduate School of Engineering, Kyoto University

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  • 飛灰構成物質の排ガス中の水銀除去能に関する研究
  • ヒカイ コウセイ ブッシツ ノ ハイガス チュウ ノ スイギン ジョキョノウ ニ カンスル ケンキュウ

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Abstract

The present study was undertaken to investigate whether compounds (other than unburned carbon) constituting fly ash would facilitate the removal of mercury in flue gas after municipal solid waste incineration. For compounds proven to have such a capacity, the authors examined the mercury removal efficiency under various atmospheric and other conditions, with the goal of clarifying the mechanism by which these compounds facilitate the removal of mercury. When mercury (II) chloride gas passed through the calcined fly ash, containing no unburned carbon, with either 5 % iron chloride or 5 % zinc compounds, calcined fly ash with 5 % zinc sulfide had the highest efficiency of mercury removal, and the mercury removal efficiency with this compound increased as the temperature became lower. The main mechanism was considered to be a fluid-particle reaction between mercury (II) chloride and zinc sulfide. X-ray diffraction analysis revealed that mercury which was removed by the layer of calcined fly ash with 5 % zinc sulfide, assumed the form of black mercury sulfide on the surface of the powder formed.

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