21.石炭ガス化ガス中の鉄系収着剤を用いた水銀の除去

概要

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Hg^0 vapor is one of toxic substances derived from gasification and combustion of coal. Previously we have suggested that Hg^0 vapor can be removed as HgS (s) over iron based sorbents in the presence of H_2S. In this study, the Hg^0 removal performance in coal derived fuel gas using laboratory made Fe_2O_3 and FeS_2 (reagent and ore) investigated in the presence of HCl. For Fe_2O_3, the Hg^0 removal activity decreased in the presence of HCl and the activity dropped with the increase of HCl concentration. Reagent FeS_2 showed high activity for Hg^0 removal, while Hg^0 removal activity of ore FeS_2 was low. However, kneading of ore FeS_2 powder with H_2O resulted in reduction of bulk density and the activity was enhanced. The effect of reaction temperature in the range of 60〜150℃ using kneading FeS_2 (ore) was investigated. The activity tended to be higher at lower temperature. The presence of HCl in the fuel gas has no effect on the Hg^0 removal activity of FeS_2.
一般社団法人日本エネルギー学会の論文
2006-10-12