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将3种烟煤和5种无烟煤按不同比例掺混后制备成试验混煤,利用热天平试验测试数据绘制TG-DTG曲线,利用扫描电镜(SEM)观察不同配比的混煤表面孔隙结构和形态特征,采用Coats-Redfern积分法求解混煤热解动力学参数。结果表明,混煤中无烟煤所占比例越高,热解过程中挥发分析出强度越低,着火越困难;混煤中无烟煤所占比例升高时,混煤表面空隙结构也相对更致密,挥发分更难析出,混煤更不易发生反应;在无烟煤和烟煤混合热解的时候,不能仅从活化能数据的大小来判断混煤热解反应活性的高低。为掌握不同配比的混煤中各组分转化机制提供一定参考。
The mixture of three kinds of bituminous coal and five kinds of anthracite coal were mixed in different proportions to prepare test mixed coal. TG-DTG curve was drawn by using thermogravimetric test data. The pore structure and morphology of mixed coal with different proportions were observed by scanning electron microscope (SEM) The kinetic parameters of mixed coal pyrolysis were solved by Coats-Redfern integral method. The results show that the higher the proportion of anthracite in the mixed coal is, the lower the intensity of the volatile analysis during the pyrolysis is and the more difficult it is to fire. When the proportion of anthracite in the mixed coal increases, the surface void structure of the mixed coal is relatively dense and volatile Points more difficult to precipitation, mixed coal is more difficult to react; anthracite and bituminous mixed pyrolysis time, can not only determine the size of the activation energy data pyrolysis reaction activity level. To provide some reference for mastering the conversion mechanism of each component in different proportion of mixed coal.