注氮促排煤体瓦斯数值模拟研究*

doi:10.16265/j.cnki.issn 1003-3033.2021.11.018

摘要/Abstract

摘要： 为探究二元气体(瓦斯/氮气)压力和吸附解吸效应对煤体注氮促排瓦斯的影响,建立包括煤体变形方程、孔隙率/渗透率动态耦合方程及二元气体运移控制方程的注氮促排瓦斯多场耦合模型;通过Comsol软件模拟是否考虑二元气体压力、吸附解吸效应条件下的煤体变形、渗透率、促排瓦斯效果。结果表明:不考虑二元气体压力和吸附解吸效应时,煤体轴向变形量最大,渗透率最低;仅考虑单一因素时,煤体轴向变形量减小,渗透率升高,且二元气体压力抑制煤体变形能力强于吸附解吸效应;同时考虑2因素时,抑制煤体变形能力、增渗作用进一步提升。注氮时间相同时,注气端瓦斯压降幅度明显大于排气端瓦斯压降幅度,促排瓦斯效果随着距注气端距离的增大逐渐削弱。

关键词: 注氮促排瓦斯, 煤体变形能力, 渗透率, 二元气体压力, 吸附解吸效应

Abstract: In order to study influence of binary gas pressure and adsorption-desorption effect on practices of nitrogen injection to promote gas drainage, a multi-field coupling model of such practice was established, which included coal deformation equation, dynamic coupling equation of porosity/permeability and binary gas migration control equation. Then, Comsol software was used to simulate coal deformation, permeability and gas drainage effect with or without consideration to binary gas pressure and adsorption-desorption effect. The results show that when these two factors are not considered, axial deformation of coal will be the largest while permeability is the lowest. When one of the factors is taken into account, axial deformation decreases, permeability increases, and ability of binary gas pressure to restrain coal deformation is stronger than that of adsorption-desorption effect. For the case where two factors are both considered, deformation inhibition capacity and permeability are both further improved. For the same nitrogen injection time, gas pressure drop amplitude at the injection port is significantly greater than that at exhaust port, and effect of gas drainage gradually weakens along with increase of distance to injection port.

Key words: nitrogen injection to promote gas drainage, coal deformation capacity, permeability, binary gas pressure, adsorption-desorption effect

中图分类号:

X936

季鹏飞, 林海飞, 孔祥国, 龙航, 李博涛. 注氮促排煤体瓦斯数值模拟研究^*[J]. 中国安全科学学报, 2021, 31(11): 127-134.

JI Pengfei, LIN Haifei, KONG Xiangguo, LONG Hang, LI Botao. Numerical simulation research on coal gas drainage by nitrogen injection[J]. China Safety Science Journal, 2021, 31(11): 127-134.

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注氮促排煤体瓦斯数值模拟研究^*

Numerical simulation research on coal gas drainage by nitrogen injection

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