CaCl2添加对热解煤中汞析出规律影响的实验研究

Experimental study on mercury release behavior during coal pyrolysis with calcium chloride addition

    摘要
  • 摘要: 在程序升温热解反应装置上，研究了低氯煤中添加不同氯含量（质量分数0.1%、0.3%、0.5%）的CaCl2对煤热解过程中汞析出规律的影响。实验结果表明，温度是影响汞析出的关键因素；随着氯添加量的增加，Hg2+析出比例呈上升趋势，且汞的最佳析出温度降低，汞的释放率也有所降低；随着热解气氛中O2比例的增加，Hg2+比例也略有增加；较高的升温速率能加快汞的释放，也能提高Hg2+的比例。低氯煤中添加氯化钙能够强化单质汞的氧化。

     

    Abstract: Mercury release and speciation behavior during coal pyrolysis with the addition of calcium chloride in different chlorine contents of 0.1%,0.3% and 0.5% in mass was studied in a temperature-programmed tube furnace. The concentration of gaseous mercury was monitored online with an online mercury analyzer. The results show that the temperature is a key factor for the mercury releasing during coal pyrolysis. With the rising of calcium chloride addition in coal, the percentage of Hg2+ increases, while the temperature of maximum mercury releasing and the release of total mercury decrease. The percentage of Hg2+ also increases to some degrees with the increase of O2 percentage raised. Higher heating rate can promote the mercury release in coal and enhance the proportion of Hg2+ in flue gas. The study indicates that the calcium chloride addition into the low-chlorine coal can enhance the oxidation of Hg0.

     

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