22.活性炭と硫化水素を用いた石炭燃焼排ガス中の水銀除去に及ぼす塩化水素の影響

概要

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Mercury vapor from coal combustion flue gas affects the earth's environment significantly because of its toxicity and high volatility. Removal of mercury vapor using activated carbons (ACs) is an effective technique, however safe treatment of the used ACs after Hg removal is very difficult. In this research, we use H_2S which doesn't exist in coal combustion flue gas, to capture Hg in the form of low toxic mercury sulfide using ACs. Experiments were carried out with the gas compositions similar to coal combustion flue gas. The effect of HCl in the coal combustion flue gas on Hg removal was investigated in details. In the absence of HCl, removal of Hg increased with increasing concentration of H_2S, indicating that Hg was adsorbed in the form of mercury sulfide over ACs. In the presence of HCl, the effect of HCl was much higher than that of H_2S on Hg removal. However, a positive effect of H_2S on Hg removal was also observed at low HCl concentration. These results suggest that in the presence of both H_2S and HCl, some part of Hg may be adsorbed in the form of mercury sulfide.
一般社団法人日本エネルギー学会の論文
2006-10-12