Study on mechanism of mercury oxidation by fly ash from coal combustion  

作　　者：ZHAO YongChun ZHANG JunYing LIU Jing DIAZ-SOMOANO Mercedes MARTINEZ-TARAZONA M. Rosa ZHENG ChuGuang 

机构地区：[1]State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, China [2]Instituto Nacional del Carbon ( CSIC), Francisco Pintado Fe 26, 33011, Oviedo, Spain

出　　处：《Chinese Science Bulletin》2010年第2期163-167,共5页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50906031, 50721005, 20877030);National Basic Re-search Program of China (Grant No. 2006CB200304);China Postdoc-toral Science Foundation Funded Project

摘　　要：To understand the interaction of fly ash and mercury, systematic experiments on mercury oxidation in single flue gas composition are conducted on a fixed bed reactor system, the desorption rate and speciation of mercury are valuated. The results indicate that fly ash itself can significantly promote elemental mercury oxidation. A classification of fly ash activated sites is developed according to the speciation of mercury during adsorption-desorption tests, the reaction mechanism of mercury oxidation by fly ash is proposed. Acid gas can promote mercury oxidation and improve the stability of oxidation product. Lattice oxygen is an important oxidant of mercury oxidation.To understand the interaction of fly ash and mercury, systematic experiments on mercury oxidation in single flue gas composition are conducted on a fixed bed reactor system, the desorption rate and speciation of mercury are valuated. The results indicate that fly ash itself can significantly promote elemental mercury oxidation. A classification of fly ash activated sites is developed ac- cording to the speciation of mercury during adsorption-desorption tests, the reaction mechanism of mercury oxidation by fly ash is proposed. Acid gas can promote mercury oxidation and improve the stability of oxidation product. Lattice oxygen is an important oxidant of mercury oxidation.

关 键 词：氧化机制 粉煤灰 煤炭燃烧 汞 反应器系统 氧化反应机理 相互作用 烟气成分 

分 类 号：TQ153.1[化学工程—电化学工业] X770.5[环境科学与工程—环境工程]