电场组合作用下煤体瓦斯吸附与渗透规律研究

发布时间：2018-05-27 21:07

本文选题：等温吸附 + 渗透　；参考：《中国矿业大学》2017年硕士论文

【摘要】：瓦斯是我国煤矿的主要灾害因素之一,煤与瓦斯突出严重威胁着我国煤矿的安全生产,作为一种区域防突措施,预抽煤层瓦斯能有效消除采掘工作面突出危险性。我国煤田地质条件复杂,大部分煤层渗透性较差,瓦斯抽采难度大。高瓦斯低透气性煤层增透抽采成为高瓦斯突出矿井安全、高效生产的关键。研究低透气性煤层高效增透非常必要。本文通过实验测试和数据分析,主要研究不同电场及电场组合作用下煤体瓦斯吸附特性/渗透规律。主要研究工作和成果有:(1)建立了外加电场作用下煤体瓦斯等温吸附/渗透率实验装置,测试了脉冲电场作用下煤体内不同吸附质的等温吸附特性,分析了不同吸附质在煤体内吸附特性与所施加电场强度及频率之间的关系,揭示了脉冲电场作用下煤体瓦斯(甲烷)等温吸附与二氧化碳等温吸附的差异性。相同脉冲电场条件下,煤体瓦斯等温吸附受电场影响比二氧化碳大。(2)测试并分析了不同电场组合作用下煤体瓦斯(甲烷)等温吸附特性。研究发现,电场组合作用使瓦斯吸附量下降,而且电场组合作用下瓦斯吸附量降低比单一交变电场作用下更明显。(3)测试并分析了电场组合作用下煤体渗透率的变化规律,对比了电场组合作用与单一交变电场作用对煤体渗透率影响的差异,探索了不同电场对煤体瓦斯渗透的作用效果。交变电场作用和电场组合作用对煤体渗透率改善效果的优劣顺序为:杨庄煤棋盘井煤袁庄煤,而且电场组合作用对煤体渗透率改善效果要优于单一交变电场。
[Abstract]:Gas is one of the main disaster factors in coal mines in China. Coal and gas outburst seriously threaten the safe production of coal mines in China. As a regional anti-outburst measure, pre-drainage of coal seam gas can effectively eliminate the danger of outburst in mining face. The geological conditions of coal field in China are complex, the permeability of most coal seams is poor, and the gas drainage is difficult. High gas and low permeability coal seam antipenetration and drainage become the key to safe and efficient production of high gas outburst mine. It is necessary to study the high-efficiency anti-permeability of low permeability coal seam. Through experimental test and data analysis, the adsorption characteristics and permeability of coal gas under different electric field and electric field combination are studied in this paper. The main research work and results are as follows: (1) the experimental equipment of isothermal adsorption / permeability of coal gas under the action of external electric field is established, and the isothermal adsorption characteristics of different adsorbents in coal body under the action of pulsed electric field are tested. The relationship between the adsorption characteristics of different adsorbents in coal and the intensity and frequency of applied electric field is analyzed. The difference between the isothermal adsorption of coal gas (methane) and the isothermal adsorption of carbon dioxide under the action of pulsed electric field is revealed. Under the same pulsed electric field, the isothermal adsorption characteristics of coal gas (methane) under different electric field combinations were measured and analyzed. The isothermal adsorption of coal gas was more affected by electric field than that of carbon dioxide. It is found that the combination of electric field decreases the amount of gas adsorption, and the decrease of gas adsorption under the combination of electric field is more obvious than that under the action of single alternating electric field. The difference between electric field combination action and single alternating electric field effect on coal permeability is compared, and the effect of different electric field on coal gas permeability is explored. The order of the effect of alternating electric field and electric field combination on coal permeability improvement is as follows: Yuanzhuang coal, Qipan coal, Yangzhuang coal, and the effect of electric field combination on coal permeability improvement is better than that of single alternating electric field.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD712

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