煤粒瓦斯初始扩散系数及其影响因素

发布时间：2018-01-21 09:59

本文关键词： 动扩散初始扩散系数煤体结构变质程度粒径　出处：《煤矿安全》2016年10期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The primary structure coal / structural coal samples of Pingmei No.8 Coal Mine and Hebi No.6 Coal Mine were studied and analyzed by diffusion experiment. Using the experimental data and combining with the new model of dynamic diffusion coefficient, the 0.5% 1.0 was calculated respectively. The initial diffusion coefficient D _ 0 of MPa under three adsorption equilibrium pressures was compared and analyzed, and the different coal structure and metamorphic degree were preliminarily discussed. The effect of different particle sizes on D- 0 of coal samples under different adsorption equilibrium pressure: on the whole, the initial diffusion coefficient D0 of tectonic coal is larger than that of primary structure coal; In the contrast of tectonic coal, the initial diffusion coefficient of Hebi lean coal sample is smaller than that of Pingdingshan fat coal sample, but in the contrast of primary structure coal. On the whole, the relationship of diffusion coefficient shows the opposite law. With the change of pressure, the initial diffusion coefficient D _ (0) of tectonic coal sample with diameter of 0.5 ~ 1.0 mm is obviously larger than that of coal sample with diameter of 0.25 ~ 0.5 mm. The comparison results of D _ 0 and D _ 0 of two kinds of coal samples of primary structure coal show a similar law as a whole.
【作者单位】：河南理工大学安全科学与工程学院;河南省中原经济区煤层(页岩)气协同创新中心;
【基金】：“十二五”国家科技重大专项资助项目(2011ZX05040-005) 河南省高校科技创新团队支持计划资助项目(14IRTSTHN002) 高等学校博士学科点专项科研基金资助项目(20134116110006)
【分类号】：TD712
【正文快照】： 基于Fick扩散定律的煤中瓦斯扩散规律以及相关模型的研究对于准确预测煤层瓦斯含量以及煤层气资源储量的计算具有至关重要的作用;同时,利用扩散规律得出的瓦斯放散初速度对于辨识突出煤层具有现实参考意义[1-7]。浓度差是煤孔裂隙中瓦斯气体发生扩散的驱动力,而煤又是一种具有

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