焦油渣和煤沥青配煤炼焦处置实验研究

通过对焦油渣、煤沥青开展配煤捣固炼焦实验,分别分析不同炼焦残渣配比下,焦炭成分的变化,确定其较优掺入比例,并分析残渣对焦炭和尾气中多环芳烃、重金属含量的影响。结果表明,焦油渣掺入比例为4.5%,煤沥青掺入比例为6%是较为适宜的。此条件下,焦炭中重金属含量较高,进入到尾气中的部分有限,而多环芳烃含量极少,大部分都进入到尾气中,故炼焦尾气需要经冷凝、过滤和吸附净化后再排放。

EXPERIMENTAL STUDY ON CO-COKING OF COAL MIXED WITH TAR DREG AND TAR PITCH

Coking of the coal mixed with tar dreg or tar pitch was studied for determination of the optimum ratio.The quality of coke was analyzed from the coke composition,mechanical strength,thermal properties,and the influences for the content of PAHs and heavy metals in coke and exhaust by residue were analyzed.Experimental results showed that the optimum ratio for tar dreg was 4.5％,and the optimum ratio for tar pitch was 6％.The content of heavy metals in coke was high,but the content of heavy metals in exhaust was low.In contrast,thc content of PAHs in coke was low,but the content of PAHs in exhaust was high.The experimental results showed that the content of heavy metals in coke was not so different from that in crude material with the best ratio,but coking tail gas was discharged before clearing because of PAHs.