烟气组分及飞灰对汞形态转化的影响  

Effects of flue gas components and fly ash on mercury oxidation

作　　者：罗津晶[1,2] 张龙东[1,2] 黄华伟[2] 张杰儒[1,2] 

机构地区：[1]厦门大学福建省等离子体与磁共振研究重点实验室,厦门361005 [2]厦门大学环境科学研究中心,厦门361005

出　　处：《北京科技大学学报》2011年第6期771-776,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.20707018);福建省科技重点资助项目(No.2008I0024);中央高校基础业务费资助项目(No.2010121078);厦门市科技计划资助项目(No.3502Z20103014)

摘　　要：模拟研究O2、SO2和HCl三种烟气气体与飞灰存在状态对汞形态转化的影响,并探讨温度对其转化的作用.结果表明:在不同气氛中,反应温度升高有利于汞的氧化,但N2--SO2的烟气体系则相反;O2、SO2和HCl单独存在于烟气中时,对汞的氧化起到不同程度的促进作用,其中HCl的效果最好;烟气中含有O2和HCl将使汞的氧化率明显提高;当SO2与HCl同时存在于烟气中时,SO2会通过与HCl反应抑制汞的氧化过程.飞灰为氧化反应提供反应介质和催化剂,促进烟气中汞的形态转化.The effects of gas components such as O2,SO2 and HCl,the existence of fly ash,and temperature on mercury speciation were investigated.It is shown that high temperature is positive to mercury oxidation in most of the simulated flue gas system except for the N2-SO2 system.The existence of O2,SO2 and HCl in the system separately improves the oxidation process,and among them HCl performs the best.When both SO2 and HCl are in the system,the oxidation efficiency of HCl decreases due to the reaction between SO2 and HCl.Fly ash provides,reaction media and catalysts for the mercury oxidation reaction,and consequently,the existence of fly ash in the simulated flue gas can increase mercury speciation.

关 键 词：煤燃烧 烟气 飞灰 汞 氧化 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]