活性焦脱汞实验研究

针对吸附剂对气态汞吸附效果的影响,比较了不同活性焦吸附剂对气态汞的吸附性能,对同种活性焦吸附剂不同吸附方式进行脱汞实验研究,分析了活性焦脱汞效率随时间的变化趋势;粒径和接触面积对吸附剂脱汞性能的影响。结果表明：样本活性焦最大吸附率出现在最开始,且随着吸附时间的增加,活性焦的吸附率逐渐减小,直到吸附量接近饱和,2种活性焦的饱和汞吸附量分别达到了1.137μg/g和0.792μg/g;随着活性焦质量的增加,最大吸附率及吸附饱和时间也随之增加;改变吸附方式可将最大吸附率由原来的20%左右提高至近40%,即增加吸附剂与汞的质量比可提高吸附剂的最大吸附率,增加吸附剂与含汞气体的接触面积可更好地提高吸附剂的脱汞效率。

Experimental research of mercury removal efficiency by activated coke

Analyse the effect of different adsorbents on gaseous mercury adsorption,compare the adsorption capacity of different activated cokes on gaseous mercury.For the same activated coke,investigate the adsorption methods on mercury removal efficiency over time,influence of particle size and contact area on efficiency.The results show that,at the beginning of adsorption reaction,the adsorption rate is maximum,then decreases until saturate the activated coke.The saturation adsorption capacity of these two kinds of activated coke is 1.137 μg/g and 0.792 μg/g respectively.With the increase of activated coke quality,the adsorption efficiency and needed time for saturation increase.Changing methods,the maximum adsorption rate is raised from 20 percent to 40 percent,that means,the higher adsorbent and mercury ratio,the greater adsorption efficiency.Increase the contact area of adsorbent with mercury-containing gas can improve mercury removal efficiency.