煤粒瓦斯扩散行为的气压依赖性研究

发布时间：2018-06-16 07:51

  本文选题：煤粒 + 瓦斯　； 参考：《中国安全生产科学技术》2017年04期

【摘要】：为了研究煤粒瓦斯扩散系数对气压的依赖性,应用自主搭建的煤岩吸附瓦斯实验系统进行不同气压条件下的煤粒瓦斯扩散实验,并通过模型拟合得到不同气压条件下的扩散系数,分析扩散系数对气压的依赖性。研究结果表明:实验煤样具有双重孔隙结构;由于煤粒对瓦斯具有吸附性,导致模型拟合得到的扩散系数是表观扩散系数而不是真实扩散系数;表观扩散系数与真实扩散系数呈正比例关系,与等温吸附线斜率呈反比例关系;在低压阶段,煤粒瓦斯扩散由努森扩散主导,此时表观扩散系数与气压呈正比例关系;在高压阶段,煤粒瓦斯扩散由分子扩散主导,此时表观扩散系数与气压呈反比例关系。
[Abstract]:In order to study the dependence of coal particle gas diffusion coefficient on gas pressure, the coal particle gas diffusion experiment under different pressure conditions was carried out by using the self-built coal rock adsorption gas experimental system. The diffusion coefficient under different pressure conditions is obtained by model fitting, and the dependence of diffusion coefficient on pressure is analyzed. The results show that the experimental coal samples have dual pore structure and the diffusion coefficient obtained by the model fitting is the apparent diffusion coefficient rather than the real diffusion coefficient due to the adsorption of coal particles to gas. The apparent diffusion coefficient is proportional to the real diffusion coefficient, and inversely proportional to the slope of isothermal adsorption line, and in the low pressure stage, the coal particle gas diffusion is dominated by the Knudsen diffusion, and the apparent diffusion coefficient is in a positive proportion to the atmospheric pressure. At the high pressure stage, the diffusion of coal particles is dominated by molecular diffusion, and the apparent diffusion coefficient is inversely proportional to the pressure.
【作者单位】： 中国矿业大学(北京)资源与安全工程学院;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;中国矿业大学(北京)共伴生能源精准开采北京市重点实验室;
【基金】：煤炭资源与安全开采国家重点实验室开放课题项目(SKLCRSM16KFB06) 国家重点研发计划项目(2016YFC0801402,2016YFC0600708) 国家自然科学基金项目(51474219)
【分类号】：TD712
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本文编号：2025932