石灰石湿法脱硫系统中汞的二次释放特性  

Secondary Release Characteristic of Mercury in Limestone Wet Flue Gas Desulfurization System

作　　者：孟东栋 王炫[2] 杨涛[2] 张成[2] MENG Dongdong WANG Xuan YANG Tao ZHANG Cheng(Guangzhou China Power Lixin Electricity Industrial Co., Ltd., Guangzhou, Guangdong 511340, China School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China)

机构地区：[1]广州中电荔新电力实业有限公司,广东广州511340 [2]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《广东电力》2016年第11期18-22,132,共6页Guangdong Electric Power

基　　金：广东省省部产学研结合项目(2013B090500008);国家自然科学基金资助项目(51006042)

摘　　要：针对石灰石–石膏法烟气脱硫系统对Hg^0无脱除能力的问题,采用实验的方式,研究了浆液中Hg^(2+)的初始质量浓度以及浆液温度、pH值、S(IV)的物质的量、SO_4^(2-)的物质的量、Cl^-的体积分数,添加Na_2S和H_2O_2溶液等工况变化对汞二次释放行为的影响。结果表明,Hg^(2+)的初始质量浓度、SO_4^(2-)的物质的量对汞的二次释放影响不大,温度升高、pH值高可降低汞的二次释放,浆液中有少量的S时可促进汞的还原,浆液中有Cl^-或添加Na_2S和H_2O_2时可抑制汞的还原。In allusion to the problem of limestone-gypsum wet flue gas desulfurization（WFGD） system being unable to removing Hg0, this paper employs experiments for studying influence of changes of working conditions on mercury secondary re- lease such as initial mass concentration of Hg2＋ in serous fluid, temperature and pH value of serous fluid, amount-of-substance concentration of S（IV） and SO24-, volume fraction of Cl- and addition of Na2S and H2O2. Results indicate initial mass concentration of Hg2＋ and amount-of-substance concentration of SO24- has small influence on mercury secondary release, rise of temperature and high pH value can reduce mercury secondary release and a small number of S in serous fluid will promote reduction of mercury. In addition, when there is C1 in serous fluid or adding Na2 S and H2O2, it is able to restrain reduction of mercury.

关 键 词：燃煤锅炉 烟气脱硫 汞 二次释放 

分 类 号：X701[环境科学与工程—环境工程]