采用等密度梯度离心分离方法,对神府东胜矿区马家塔露天煤矿2号煤层煤进行了镜质组和惰质组煤岩显微组分的分离富集.利用TG/MS对两种显微组分热解脱挥发分行为进行了升温速率为20℃/min条件下的测试,获得了热解甲烷生成的速率曲线,并对其热解生成特征进行了分析.采用分峰拟合的方法,将其分为6个峰,计算得到了各基元反应的动力学参数及其热解特征参数,认为神东煤镜质组和惰质组热解甲烷的生成由煤大分子裂解、缩聚过程中的6种反应所致.通过动力学分析,结合煤大分子的热解规律、热解过程中其它挥发分的逸出特征及相关模型化合物的量子化学计算结果,对热解甲烷生成的6种反应类型进行了具体分析.%Vitrinite and inertinite macerals were Separated and concentrated from No. 2 coal seam of Shendong Majiata opencast coalfield by isogradient centrifugal separation. The thermal devolatilisation behavior of two types of maceral was investigated by TG/MS at heating rate of 20 ℃/min and the on-line evolution curves of methane generation during pyrolysis were acquired.The pyrolytic generation characteristics of methane were analyzed. Six peaks were suitable for curve fitting,and the kinetic parameters were calculated and the characteristic parameters of the pyrolysis of the single reactions were listed. The results indicate that methane generation were results of the cracking and condensation of coal macromolecules. Six types of reaction for methane generation were presented by kinetic analysis combined with pyrolysis discipline, the evolution features of other volatiles during pyrolysis and quantum chemical calculations of the relevant model compounds.
展开▼
