氯、氟离子对烟气中汞形态和分布的影响  

Effect of chlorine and fluorine elements on mercury species and its distribution in flue gas

作　　者：殷立宝[1] 余亮英[2] 徐齐胜[1] 熊扬恒[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]武汉大学动力与机械学院,湖北武汉430072

出　　处：《热力发电》2014年第10期16-19,24,共5页Thermal Power Generation

基　　金：华中科技大学煤燃烧国家重点实验室开放基金(FSKLCC1004);广东省省部产学研结合项目(2012B091000166)

摘　　要：在100kPa、50-950℃的条件下，采用化学热力平衡分析方法研究了煤燃烧过程中F离子和Cl离子对痕量元素汞的形态及其分布的影响。结果表明：在煤燃烧的较高温度区域，单质汞是汞的主要形式；随着烟气温度的降低，单质汞将发生化学反应生成二价汞的化合物，形式主要为HgCl2（g）；氯离子含量的增加可以增强汞的蒸发，有利于排放控制，而氟元素对汞在烟气中的行为特性几乎无影响。The effect of F- and Cl- formed during coal combustion on mercury species and its distribution at 100 kPa and 50 ℃ to 950 ℃ was investigated by using the chemical thermodynamic equilibrium method. The results indicate that elemental mercury is the main form in the maximum temperature zone of coal combustion.With the reduction of temperature,the elemental mercury will convert into bivalent mercury compound,which is mainly HgCl2 （g）,through chemical reaction.In addition,the increase of chlorine ele-ment can lead to acceleration in mercury evaporation.However,the fluorine element nearly has no influence on mercury＆#39;s behavior in the flue gas.

关 键 词：燃煤烟气 汞 氟离子 氯离子 化学热力平衡 排放控制 

分 类 号：X511[环境科学与工程—环境工程]