柱状煤芯瓦斯扩散模型与扩散特征实验研究

发布时间：2018-03-05 21:41

  本文选题：柱状煤芯　切入点：瓦斯　出处：《中国矿业大学学报》2017年05期 　论文类型：期刊论文

【摘要】：采用Φ50mm×100mm的标准柱状原煤样开展了不同温压下的瓦斯扩散实验,同时开展了同种煤的颗粒煤瓦斯扩散对照实验.为描述大尺度柱状煤样的瓦斯扩散过程,建立了柱状煤芯瓦斯扩散方程,导出了其扩散率解析解.实验表明:相比颗粒煤样,柱状原煤瓦斯扩散缓慢,表现为同时间下瓦斯累计扩散量和扩散率远小于颗粒煤.柱状煤芯的扩散系数远大于颗粒煤的扩散系数,是后者的11.72倍,而柱状煤的有效扩散系数远小于颗粒煤的有效扩散系数,仅为后者的1.82%.原因是柱状原煤包含了更大的孔裂隙结构,使其扩散系数较大,但因扩散路径的加长和迂曲度的增大,使其有效扩散系数较小,最终导致其具有较小的瓦斯释放能力.
[Abstract]:The gas diffusion experiments under different temperature and pressure were carried out with standard cylindrical coal samples of 桅 50mm 脳 100mm, and the gas diffusion experiments of the same coal were carried out in order to describe the gas diffusion process of large scale columnar coal samples. The gas diffusion equation of columnar coal core is established and the analytical solution of its diffusivity is derived. The experimental results show that the gas diffusion of columnar raw coal is slower than that of granular coal. The results show that the accumulative gas diffusivity and diffusivity are much smaller than that of granular coal at the same time, and the diffusion coefficient of columnar coal core is much larger than that of granular coal, 11.72 times of that of the latter. The effective diffusion coefficient of columnar coal is much smaller than that of granular coal, which is only 1.82 of the latter. The reason is that the columnar raw coal contains larger pore and fissure structure, which makes its diffusion coefficient larger, but due to the increase of diffusion path and roundness, The effective diffusion coefficient is small, which leads to the smaller gas release capacity.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;河南理工大学中原经济区煤层(页岩气)河南省协同创新中心;河南理工大学煤矿灾害预防与抢险救灾教育部工程研究中心;河南理工大学河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地;
【基金】：煤矿灾害动力学与控制国家重点实验室开放课题(2011DA105287-KF201313) 国家自然科学基金项目(51004041,51374095,41172141) 长江学者和创新团队发展计划项目(PCSIRT1235)
【分类号】：TD712
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