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通过扩散实验对平煤八矿、鹤壁六矿原生结构煤/构造煤煤样进行研究分析,利用实验数据,并结合动扩散系数新模型,分别计算出0.5、1.0、1.5 MPa 3个吸附平衡压力下的初始扩散系数D_0,经过比较分析,初步探讨了不同煤体结构、不同变质程度、不同粒径在不同吸附平衡压力下对煤样的D_0的影响规律:整体上来看,构造煤初始扩散系数D_0比原生结构煤要大;在构造煤的对比中,鹤壁贫瘦煤煤样的初始扩散系数小于平顶山肥煤煤样的初始扩散系数,而在原生结构煤的对比中,扩散系数的大小关系整体上呈现相反的规律;随着压力的变化,构造煤粒径为0.5~1.0 mm的煤样的初始扩散系数D_0明显大于粒径为0.25~0.5 mm的煤样,原生结构煤2种粒径煤样的D_0大小对比结果整体上呈现出相似规律。
Through the diffusion experiments, the coal samples of primary structure coal and structural coal from Pingdingshan No.8 Mine and Hebi No.6 Mine were studied and analyzed. Based on the experimental data and the new model of dynamic diffusion coefficient, three adsorption equilibrium pressures of 0.5, 1.0 and 1.5 MPa Under different adsorption equilibrium pressure, the initial diffusion coefficient D_0 under different adsorption equilibrium pressure is discussed preliminarily: Through the comparative analysis, the influence of different coal body structure, different metamorphic degree and different particle diameter on the D_0 of coal sample is preliminarily discussed: on the whole, the initial diffusion coefficient D_0 is larger than that of primary structural coal. In contrast to tectonic coal, the initial diffusion coefficient of Hebi lean coal samples is smaller than that of Pingdingshan fat coal samples. However, in the comparison of primary structure coal, the diffusion coefficient On the whole, the opposite rule appears. With the change of pressure, the initial diffusion coefficient D 0 of coal samples with tectonic coal diameter of 0.5-1.0 mm is obviously larger than that of coal samples with 0.25-0.5 mm of particle size. The results of the comparison of the D_0 size of the coal samples showed a similar pattern as a whole.