在100 kPa、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's behavior in the flue gas.
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