煤田地质与勘探2016，Vol.44Issue(4)：59-63,68,6.DOI:10.3969/j.issn.1001-1986.2016.04.011
软煤和硬煤的甲烷吸附扩散特性对比
Comparison of methane adsorption and diffusion characteristics in soft and hard coal
摘要
Abstract
Adsorption and diffusion in soft and hard coal determine the abundance and seepage rule of coal-bed gas, we can facilitate the identification of the function of gas in coal and gas outburst and improve the coal seam gas re-covery rate and drainage rate in mining through researching the adsorption and diffusion, so the research on adsorption and diffusion is of important significance. Using the experimental device designed by us, we studied the characteris-tics of adsorption and diffusion of samples, these samples came from Xin’an mine and NO.1 mine of Pingdingshan and were divided into two groups, and each group was divided into soft coal and hard coal, the comparison of absorp-tion amount and Langmuir coefficient was studied under same absorption pressure, the control factors of coal surface energy were analyzed and the diffusion coefficient in initial desorption time was examined. The research results indi-cate that the coal surface energy is not apparently different in soft coal and hard coal, the Langmuir adsorption volume of soft coal is bigger than that of the hard coal in the same coal seam, the absorption amount is related with pressure and strength of coal body, the diffusion coefficient of the hard coal is bigger than that of the soft coal, and whether hard or soft coal, the diffusion coefficient tends to decrease with the desorption time and pressure, but the diffusion coefficient of the soft coal is bigger than that of the hard coal during short period of diffusion. The results are impor-tant for increasing recovery ratio in mines and studying the mechanism of coal and gas outburst.关键词
甲烷/软硬煤/吸附/扩散系数Key words
methane/soft and hard coal/adsorption/diffusion coefficient分类
矿业与冶金引用本文复制引用
赵发军,陈学习,刘明举..软煤和硬煤的甲烷吸附扩散特性对比[J].煤田地质与勘探,2016,44(4):59-63,68,6.基金项目
河北省矿井灾害防治重点实验室开放基金(KJZH2014K05)；国家自然科学基金项目(51374095，51404099) @@@@Key Laboratory of Mine Disaster Prevention and Control in Hebei Province(KJZH2014K05)；National Natural Science Foun-dation of China (51374095，51404099) （KJZH2014K05）
