石灰石-石膏法を想定した脱硫吸収液のガス状水銀捕捉特性

概要

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Combustion flue gases have particulate and gaseous mercury. Particulate mercury is captured in an electrostatic precipitator (EP) as fly ash but gaseous mercury passes through an EP and flows into a wet-flue gas desulfurization (wet-FGD) unit in combustion plants. Besides, gaseous mercury takes elemental and oxidized forms (Hg^0 and Hg^<2+>) in combustion flue gases, these chemical forms have great influence on the behavior of gaseous mercury in a wet-FGD unit. The behavior of Hg^0 and Hg^<2+> in water and calcium compound slurries simulating limestone-gypsum process, which is one of wet-FGD systems, has been studied. It was clarified that almost of Hg^0 passed through the solutions, on the other hand Hg^<2+> was captured in it and some captured Hg^<2+> was converted into Hg^0, which was released from the solutions. The conversion ratio of Hg^<2+> into Hg^0 was influenced by gas and solution conditions.
一般社団法人日本エネルギー学会の論文
2004-11-20