水分对神东煤热解产物分布的影响

摘要

为考察原料煤中水分对神东煤热解产物分布的影响,通过格金试验和固体热载体小试试验研究了神东煤中水分对热解特性的影响,得到神东煤在不同水分下热解产物的分布规律.格金试验表明,水分对神东煤热解产物中焦油和热解气收率有显著影响.随着水分降低,神东煤热解产物中焦油收率从9.98％降至4.92％,热解气收率从8.47％上升至11.07％,热解水收率从2.74％上升到5.94％.小试试验结果与格金试验趋势基本相同.随着原料煤中水分的降低,焦油收率下降,热解气收率上升;未经干燥的原煤在不同温度下热解的焦油收率比干燥后煤样平均高2.17％,热解气收率平均低1.58％.热解温度对H2和CO比例影响较大,对其他气体比例影响较小.研究结果表明,水分对神东煤的热解过程及其热解产物分布有显著影响,热解原料煤中水分的增加有利于抑制神东煤热解水和热解气的生成,提高焦油收率,因此有望通过控制原料煤中的水分来调节热解产物的分布.%To investigate the effects of moisture of feed coal on the pyrolysis products distribution of Shendong coal,Gray-King and kilogram-scale pyrolysis with solid heat carrier experiments were conducted to investigate the products distribution under different moisture.The results of Gray-King experiments showed that moisture had significant influence on the ratio of coal tar and pyrolysis gas.The tar yield percent decreased from 9.98％ to 4.92％ as moisture decreased,while pyrolysis gas yield increased from 8.47％ to 11.07％ and pyrolysis water yield increased from 2.74％ to 5.94％.The results of kilogram-scale experimental equipment illustrated the similar tendency as the Gray-King experiments.As moisture decreased,the yield of tar decreased while the yield of pyrolysis gas increased.The pyrolysis tar yield of coal without drying treatment was 2.17％ higher than that of coal with drying treatment,while the pyrolysis gas yield was 1.58％ lower.The analysis results showed that the pyrolysis temperature had influence on the content of H2 and CO.The increasing moisture had benefit for the reduce of pyrolysis water and gas while yielding more tar.Therefore,the distribution of pyrolysis products could be adjusted by controlling the moisture of feed coal.