神木烟煤与桦甸油页岩的共热解特性

Co-pyrolysis Characteristics of Shenmu Bituminous Coal and Huadian Oil Shale

采用热重分析仪和固定床反应器研究了神木烟煤和桦甸油页岩的混合共热解特性及协同作用机制.结果表明,神木煤与桦甸油页岩混合共热解的失重率高于计算值,表明二者在热解和挥发分逸出过程中存在相互作用,促进了挥发分释放,减少了半焦生成.煤与油页岩的协同作用可增加热解油收率、降低半焦和水收率.油页岩与煤质量比为1:1时,所得油收率最高,为9.84%,比计算值提高8.8%.共热解有助于提高轻质油含量和收率,油页岩与煤质量比为1:4时,轻质油含量超过80%,收率约为7.5%,比计算值分别提高了8%和11.2%,表明添加少量油页岩可明显提高热解油品质.共热解过程中油页岩产生的富氢组分及自由基能抑制煤热解产生的芳香族化合物的聚合反应,促进芳烃向产物油转化,提高热解油的收率和品质.

The co-pyrolysis characteristics and related synergistic mechanism of Shenmu bituminous coal and Huadian oil shale at different blending ratios were studied in TG analyzer and fixed bed reactor. The results showed that the experimental values of weight loss from co-pyrolysis was higher than the calculated one, indicating that the possible interaction during co-pyrolysis could promote the release of volatiles and suppress the char production. The synergistic effect between coal and oil shale increased the oil yields and decreased the yields of water and char, presenting as the obvious effect of increasing oil and decreasing water in co-pyrolysis of Shenmu coal and Huadian oil shale. When the mass ratio of Huadian oil shale to Shenmu coal was 1：1, the highest oil yield was obtained of 9.84% and increased by 8.8% comparing to the calculated oil yield. Co-pyrolysis contributed to the increase of light oil content and yield. When the mass ratio of Huadian oil shale to Shenmu coal was 1：4, the light oil content higher than 80%, and yield was about 7.5%, increased by 8% and 11.2% compared with the calculated values, respectively, demonstrating that addition of a small amount of oil shale can obviously improve the pyrolysis oil quality. The hydrogen-rich components and radicals from oil shale pyrolysis helped to inhibit the polymerization of aromatics produced by coal pyrolysis and facilitated the conversion of aromatics into oil products, thus increased the pyrolysis oil yield and quality.