燃煤电厂汞迁移排放及脱除  

Migrate Emission and Removal of Mercury in Coal-Fired Power Plant

作　　者：张君[1,2] 李志超[1] 段钰锋[1] 赵蔚欣 周强[1] 朱纯[1] 

机构地区：[1]东南大学能源热转换及其控制过程测控教育部重点实验室,南京210096 [2]淮北师范大学化学与材料科学学院,淮北235000

出　　处：《燃烧科学与技术》2015年第5期415-420,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51376046);江苏省研究生科研创新计划资助项目(CXZZ13_0093;KYLX_0184;KYLX_0115)

摘　　要：采用美国EPA推荐的汞浓度现场测试OHM取样方法,对300,MW和600,MW两燃煤电厂静电除尘器(ESP)和湿法脱硫装置(WFGD)前后烟气进行等速取样,采用Hydra AA汞分析仪测试烟气各种形态的汞质量浓度.结果表明:燃煤电厂烟气汞排放占总汞排放80%,以上;ESP能有效脱除烟气中的颗粒汞,同时还能脱除部分元素汞;WFGD对烟气中氧化汞的脱除效率达90%,以上,但对元素汞的脱除效果非常有限,原因是脱硫过程存在气相和液相的还原反应,将Hg2+转化成Hg0,出口烟气Hg0含量增加,导致总汞脱除效率降低.The Ontario hydro method （OHM）was used to sample flue gas before and after electrostatic precipitator （ESP） and wet flue gas desulfurization （WFGD） in two power plants of 300 MW and 600 MW, and various mercury concentrations were analyzed by Hydra AA. The result shows that mercury emissions of flue gas phase account for more than 80% of the total mercury emissions from coal-fired plants; particulate mercury in flue gas could be effectively removed by ESP, and part of elemental mercury could also be removed; WFGD could remove more than 90% of oxide mercury in flue gas, but its ability to remove elemental mercury is very limited. The reason is that the reduction reaction of gas and liquid phase exists in desulfurization process, in which Hg^2＋ was converted into Hg^0, and the content of elemental mercury in outlet flue gas increased, leading to the decreased total removal efficiency of mercury.

关 键 词：燃煤电厂 汞排放 脱汞 燃煤烟气 

分 类 号：X511[环境科学与工程—环境工程]