含瓦斯煤自然吸水渗吸试验研究及机理探析

发布时间：2018-06-29 00:43

本文选题：含瓦斯煤 + 自然吸水　；参考：《煤炭科学技术》2015年08期

【摘要】：为了研究含瓦斯煤体自然吸水条件的渗吸作用,在自主搭建的试验平台上,研究了煤体在不同瓦斯吸附平衡压力下,自然吸入不等水量后的渗吸效应,并理论探析了渗吸机理。结果表明:含瓦斯煤样自然吸水后,煤样罐内压力自动升高,吸附态瓦斯被置换为游离态,验证了渗吸现象;在相同吸附平衡压力下,随着含水率增加,游离瓦斯增量和渗吸率均逐渐增大,在含水率2%~6%区间呈线性增加,随后增长梯度减缓,逐渐趋于稳定,表明存在极限含水率可使渗吸效应最强;在不同瓦斯吸附平衡压力下,煤样自然吸水的最大渗吸率趋于相等。试验验证了渗吸是利用煤体双重介质特性提供水分运移动力,水分强于甲烷的吸附能力进一步置换吸附态瓦斯,促进煤体瓦斯解吸,降低瓦斯含量。
[Abstract]:In order to study the seepage and absorption effect of natural water absorption conditions of gas-bearing coal body, the seepage and suction effect of coal body under different gas adsorption equilibrium pressures under different gas adsorption equilibrium pressures was studied on a self-built experimental platform, and the mechanism of seepage and suction was analyzed theoretically. The results show that after natural water absorption, the pressure in the coal tank automatically increases and the adsorbed gas is replaced into the free state, which verifies the phenomenon of osmosis, and under the same adsorption equilibrium pressure, with the increase of water content, The increment of free gas and permeation rate increased gradually, and increased linearly in the range of 2% and 6% of water content, then the growth gradient slowed down and gradually became stable, which indicated that the existence of limit moisture content could make the permeability absorption effect strongest, and under different equilibrium pressure of gas adsorption, The maximum permeation rate of natural water absorption of coal samples tends to be equal. It is proved by the experiment that infiltration is the use of coal dual medium to provide water transport power, water is stronger than methane adsorption ability to further replace the adsorbed gas, promote coal gas desorption, reduce gas content.
【作者单位】：河南理工大学安全科学与工程学院;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(51204065,51074160) 河南省科技攻关资助项目(122102310564)
【分类号】：TD712

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