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首页> 外文会议>2003 International conference on carbon >RETENTION OF ARSENIC AND SELENIUM INACTIVATED CARBONS IN COAL COMBUSTIONAND GASIFICATION FLUE GASES
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RETENTION OF ARSENIC AND SELENIUM INACTIVATED CARBONS IN COAL COMBUSTIONAND GASIFICATION FLUE GASES

机译：煤燃烧和气化烟气中砷和硒失活碳的保留

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In order to avoid problems from the emission of potentially toxic compounds of arsenic and selenium in flue gasesrnfrom coal combustion and gasification processes, it is necessary to develop efficient gas cleaning systems capable ofrnreducing their content in flue gases to below certain limits. Two activated carbons RBGH3 and RB3 were tested torncapture arsenic and selenium species present in coal combustion and gasification atmospheres, in a laboratory scalernreactor. RBGH3 was prepared by impregnating RB3 with sulphur and has proven good retention capacities forrnmercury compounds in gas phase. Arsenic and selenium compounds were retained in these carbons in differentrnproportions, the efficiency of retention mainly depending on element speciation in the different atmospheres. Thernextent of arsenic and selenium retention in coal combustion and gasification environments is different. Arsenicrnretention in both atmospheres is similar. However, retention of selenium in a combustion atmosphere is negligible,rnwhereas in a gasification atmosphere it can be higher than 50% wt.
机译：为了避免来自燃煤和气化过程的烟道气中潜在有毒的砷和硒化合物的排放所引起的问题，有必要开发一种能够将烟道气中的砷含量降低到一定限度以下的高效气体净化系统。在实验室规模的反应器中，对两种活性炭RBGH3和RB3进行了测试，以捕获煤燃烧和气化气氛中存在的砷和硒。 RBGH3是通过用硫浸渍RB3制备的，并已证明在气相中对汞化合物具有良好的保留能力。砷和硒化合物以不同的比例保留在这些碳中，保留的效率主要取决于不同大气中的元素形态。煤燃烧和气化环境中砷和硒的残留量不同。两种气氛中的砷保留相似。但是，硒在燃烧气氛中的保留可以忽略不计，而在气化气氛中硒的保留率可以高于50％（重量）。

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