School of Safety Science and Engineering.Xi'an University of Science and Technology MOE Key Lab of Mining and Disaster Prevention in Western Mine

为揭示低阶煤孔隙结构对瓦斯吸附性能的影响,选取新疆准南煤田9个典型矿井低阶煤样,进行低温氮吸附及瓦斯等温吸附试验,研究低阶煤的吸附孔特征参数及其与瓦斯吸附参数之间的关系。结果表明:试验范围内,准南煤田低阶煤等温吸附瓦斯曲线仍可用Langmuir方程表征;低阶煤的平均孔径越大,孔隙间的作用力越小,体积吸附常数、瓦斯吸附量越小,压力吸附常数、吸附饱和度越大;随着煤的比表面积、孔容及各孔径下的比表面积和孔容含量的增大,体积吸附常数、瓦斯吸附量增大,而压力吸附常数、吸附饱和度减小;在研究尺度范围内孔隙分形特征显著,体积吸附常数、瓦斯吸附量与分形维数呈正线性关系,压力吸附常数、吸附饱和度与分形维数呈负线性关系。

in order to reveal the porestructure of the low rank coal affced to the gas adsorption perfomances ,the low rank cal samples were taken from nine typical nines in Xinjang Zhunnan Coalied,the lo w temperaure nitrogen adsorption and the gas sothermal dsorption experiments were conduced and the relatonship between the adsorption pore feature paramelers and the gas adsoption parametersof the low rank coal was studied. Theresults shewed that witin the experiment cpe.the iscthemal adscption gas curves ofthe low rank coal in Zhunmnan Ccaffeld coud utize the Langmur ecuation representation.The larger average pore size of thelow rank cal was ,the smaler interaction force between the pores would be ,the smaller volume adsoption constant and the gas adsoption volulme was.the igher of he presure adsopion constant and the adsorption saturaion would be. with the increasing of the cal specific surace area.pore voume as wvl as the specific suracearea and pore volumeconent of each pore size,the voume constant and gas adsorption volume woud be increased and the pressure adsorption constants and adsorption saturation woula be decreased. Within the stuty dimension scopethe pore fractal features were obvious,the volume adsorption constant.gas adsorption volume andfractal dimension would be in a posiv linear relationship and the pressure adsopion constant.adsopion saturation and fractal dimension would be in anegatve inear relationship.

国家自然科学基金资助项目(51327007)；陕西省青年科技新星专项资助项目(2014KJXX69)；新疆科技支撑计划资助项目(201333110)；