煤矿安全2019，Vol.50Issue(8)：1-4,9,5.DOI:10.13347/j.cnki.mkaq.2019.08.002
瓦斯压力对煤体吸附特性及结构影响实验研究
Experimental Study on Influence of Gas Pressure on Adsorption Characteristics and Structure of Coal
摘要
Abstract
To deeply study the adsorption characteristics of coal body under different pressure conditions and the change of pore structure of coal body, the experimental study on gas adsorption in coal by nuclear magnetic resonance (NMR) technique was carried out. The test results show that: the micropore peak area of the experimental coal sample> the area of the large pore peak>the area of the fracture peak, indicating that the micropores of the coal sample are most developed, and the pore size of the coal body is mainly micropores, and the connectivity between the voids is not strong, gas is not easy to circulate; with the increase of pressure, when the gas pressure reaches a certain level, the coal will generate new pores, and the tiny pores will connect to form micropores or mesopores, and the mesopores will connect with each other to form cracks. It provides the conditions for gas desorption in the next step, and the instantaneous gas desorption occurs; the gas adsorption and desorption characteristics of the coal sample are divided into the ascending phase, the violent phase, the basically constant phase. The gas adsorption capacity increases with the increase of gas pressure generally. Under different gas pressures, the amplitude of nuclear magnetic signal of nuclear magnetic resonance T2 spectrum changes significantly, and the distribution area of T2 spectrum increases linearly with gas pressure. That is, the porosity of the coal increases as the gas pressure increases.关键词
瓦斯压力/NMR/T2谱图/峰值/吸附特性/煤体结构Key words
gas pressure/NMR/T2 spectrum/peak/adsorption characteristics/coal structure分类
矿业与冶金引用本文复制引用
徐佑林,吴旭坤..瓦斯压力对煤体吸附特性及结构影响实验研究[J].煤矿安全,2019,50(8):1-4,9,5.基金项目
国家自然科学基金资助项目(51764010,51874109) （51764010,51874109）
贵州省科技支撑计划资助项目(黔科合支撑[2019]2861) （黔科合支撑[2019]2861）
