次氯酸钾氧化去除烟气中单质汞的反应机理  

Reaction mechanism of elemental mercury removal from flue gas by oxidation with potassium hypochlorite

作　　者：能子礼超 杨红[3] 海来伍加[3] 刘盛余[2] 何廷宇 NENGZI Lichao;YANG Hong;HAILAI Wujia;LIU Shengyu;HE Tingyu(College of Resources and Environment,Xichang University,Xichang 615000,China;College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China;Research Center of Environmental and Economic Science,Xichang University,Xichang 615000,China)

机构地区：[1]西昌学院资源与环境学院,四川西昌615000 [2]成都信息工程大学资源环境学院,四川成都610225 [3]西昌学院环境经济科学研究中心,四川西昌615000

出　　处：《化工环保》2020年第5期507-511,共5页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金面上项目(21676032);教育部科学技术研究重点项目(211157);成都市科技局国际合作项目(2016-GH02-00032-HZ);成都市科技局科技惠民技术研发项目(2015-HM01-00127-SF);西昌学院两高人才科研支持计划项目(LGZ201709)。

摘　　要：采用KClO氧化吸收烟气中的Hg0,研究了脱汞性能和反应机理。结果表明:提高反应温度会降低脱汞性能,加快KClO热分解,减小Hg0溶解度,抑制氧化还原放热反应;提高Hg0浓度会增大Hg0在气相主体和气液界面的分压差,进而提高Hg0的传质速率,使Hg0去除率提高;继续提高Hg0浓度,反应限速步骤从气膜移向液膜,使Hg0去除率下降;KClO质量分数低于10%时,Hg0和KClO溶液的气液两相传质效率由液相控制;Hg0去除率随吸收液初始pH的升高而降低,吸收液pH随反应时间的延长而升高。Hg0 in flue gas was absorbed by oxidation with KClO,and the mercury removal efficiency and reaction mechanism were studied.The results show that increasing reaction temperature will reduce the mercury removal efficiency,accelerate the thermal decomposition of KClO,reduce the solubility of Hg0,and inhibit the redox exothermic reaction;Increasing Hg0 concentration will increase the partial pressures between gas phase bulk and gasliquid interface,thereby increase the mass transfer rate and the removal rate of Hg0;If increasing the Hg0 concentration further,the reaction control step will move to liquid film from gas film,which leads to a decreasing removal rate;When the mass fraction of KClO is less than 10%,the gas-liquid mass transfer efficiency of Hg0 and KClO solutions is controlled by the liquid phase;The Hg0 removal rate decreased with the increase of initial pH of absorption solution,while the pH of reaction solution increased with the increase of reaction time.

关 键 词：单质汞 KClO 氧化 吸收 烟气 

分 类 号：X52[环境科学与工程—环境工程]