可控源微波场促进煤体中甲烷解吸的试验研究

发布时间：2018-06-22 20:11

本文选题：采矿工程 + 煤　；参考：《岩石力学与工程学报》2017年04期

【摘要】：针对煤层瓦斯抽采过程中吸附瓦斯难以解吸的技术难题,提出可控源微波场促进煤层瓦斯解吸的新思路,采用可控源微波场作用下煤岩瓦斯解吸试验装置,研究有、无可控源微波场作用下煤体中甲烷的解吸规律,探讨可控源微波场对煤体中甲烷解吸特性的影响机理。研究结果表明,可控源微波场能够促进煤体中甲烷的解吸,使煤体的甲烷解吸速率增大且解吸后期衰减变慢、累计甲烷解吸量增加1.65~3.79倍;有、无可控源微波场作用下煤体的甲烷解吸动力学曲线形态基本一致,且能用动扩散系数模型较好地描述;相同解吸时间条件下,可控源微波场作用下煤体的甲烷扩散系数比无微波场作用时大。可控源微波场对煤体中甲烷解吸特性的影响机理主要在于可控源微波场能够增强煤体中甲烷分子的活性、提高煤体的甲烷扩散系数、改变甲烷解吸过程中煤体的扩散阻力级差,使煤体中甲烷的解吸速度增加、扩散速度加快、扩散阻力减小,从而有利于促进煤体中甲烷的解吸。
[Abstract]:In view of the technical problem that it is difficult to desorb the adsorbed gas in the process of coal seam gas extraction, a new idea of promoting the coal seam gas desorption by controlled source microwave field is put forward, and the experimental equipment of coal and rock gas desorption under the action of controlled source microwave field is adopted. The desorption law of methane in coal body under the action of microwave field without controllable source is discussed. The mechanism of influence of microwave field of controlled source on the desorption characteristics of methane in coal body is discussed. The results show that the microwave field of controlled source can promote the desorption of methane in coal, increase the rate of methane desorption and slow down the decay of methane in the later stage of desorption, and increase the total amount of methane desorption by 1.65 ~ 3.79 times. The kinetics curve of methane desorption of coal body under the action of microwave field without controllable source is basically consistent, and can be well described by the dynamic diffusion coefficient model, under the same desorption time condition, the methane desorption kinetics curve of coal body is similar in shape and can be described by dynamic diffusion coefficient model. The methane diffusion coefficient of coal under controlled microwave field is larger than that without microwave field. The mechanism of influence of controlled source microwave field on methane desorption characteristics of coal is that the controlled source microwave field can enhance the activity of methane molecules in coal body, improve the methane diffusion coefficient of coal body, and change the diffusive resistance level of coal body in the process of methane desorption. The desorption rate of methane in coal is increased, the diffusion velocity is accelerated, and the diffusion resistance is reduced, which is helpful to promote the desorption of methane in coal.
【作者单位】：中国矿业大学深部煤炭资源开采教育部重点实验室;中国矿业大学矿业工程学院;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】：国家自然科学基金资助项目(51104155) 江苏高校优势学科建设工程资助项目(SZBF2011 6 B35)~~
【分类号】：TD712

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