溶剂预处理对淮南煤热解产物分布的影响

Effect of Solvent Treatment on Pyrolysis Product Distribution from Huainan Coal

采用吡啶(Py)、四氢呋喃(THF)和CS_2作为单一溶剂分别对淮南煤(HN)进行了溶胀处理。根据热解气析出速率、组成及热解半焦、焦油、热解水等产物分布,结合热重分析,系统考察了溶胀煤的热解行为。实验结果表明,溶胀煤的热解产物分布有显著改善,热解气体积和热解焦油有不同程度的增加,热解水产率降低;CS_2和THF溶胀煤的热解气析出速率明显增大,Py溶胀煤的热解焦油产率最高,比HN原煤热解时产率提高了5.99%(质量分数,干燥无灰基),这表明溶剂和煤结构间有交互作用,从而提高溶胀煤的热解焦油产率。

Huainan coal （HN） was swollen by single-solvent such as pyridine （THF） and CS2. The pyrolytic properties of the swollen coal were systematically （Py）, tetrahydrofuran investigated by release rate and composition of the pyrolysis gas as well as the distribution of the pyrolysis products. Thermogravimetric analysis （TG） of HN and the swollen coal was also performed to probe into the pyrolysis characters. The results showed that the distribution of the products derived from the swollen coal pyrolysis was improved obviously. The pyrolysis gas volume and coal tar yield of the swollen coal were increased in different degrees, meanwhile, their pyrolysis water yields were all decreased in comparison with those of HN. The emission rates of pyrolysis gas with the swollen coal treated by CSz and THF were much higher than those of Py and HN. The coal tar yield of swollen coal treated by Py was the highest one of the 4 samples,which was 5.99% （mass fraction, dry and ash free basis of coal） higher than that of HN. The experimental results revealed that the existing interaction between solvents and coal, which could contribute to the increasing of pyrolysis coal tar yield.