煤体孔隙结构对瓦斯吸附和放散性能的影响实验研究  

Experimental study on effect of pore structure of coal on gas adsorption and dispersion properties

作　　者：宋涛 李博涛 魏宗勇 刘黎 王裴 SONG Tao;LI Botao;WEI Zongyong;LIU Li;WANG Pei(Shaanxi Coal Group Shenmu Ningtiaota Mining Co.,Ltd.,Shenmu 719000,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]陕煤集团神木柠条塔矿业有限公司,陕西神木719000 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《煤矿安全》2022年第6期12-18,共7页Safety in Coal Mines

基　　金：国家自然科学基金青年科学基金资助项目(51704228)。

摘　　要：为揭示煤体孔隙特征参数对瓦斯吸附和放散性能的影响机理,选取神木柠条塔煤矿8组煤样,进行压汞、瓦斯吸附常数及瓦斯放散初速度实验,基于Menger海绵分形模型分析了煤样的孔隙分形特征对瓦斯吸附和放散特性的影响。研究结果表明:煤样孔隙体积占比以微孔为主,其次为过渡孔、中孔及大孔,微孔对煤样孔隙体积起主导作用,其主要以半开放孔为主,中孔和大孔主要以开放性孔隙为主;分形维数D2与吸附常数a呈线性正相关,随着分形维数D2增大,吸附常数a逐渐增大;瓦斯放散初速度随分形维数D1的增加逐渐减小,其瓦斯放散性能越弱。In order to reveal the influence mechanism of pore characteristics parameters of coal body on gas adsorption and diffusion,eight sets of coal samples from Ningtiaota Coal Mine were selected for experiments on pressure mercury,gas adsorption constants and initial velocity of gas dispersion,and the pore fractal characteristics of coal samples and their influence on gas adsorption and diffusion characteristics were analyzed based on Menger sponge fractal model.The results show that the pore volume of coal sample is dominated by microporous pores,followed by transitional pores,mesopores and macropores,microporous pores play a dominant role in the pore volume of coal sample,which are mainly closed and semi-open pores,and mesopores and macropores are mainly open pores.The fractal dimension D2is linearly related to the adsorption constant a.As the fractal dimension D2increases,the adsorption constant a gradually increases,and the initial velocity of gas diffusion gradually decreases with the increase of fractal dimension D2,and the weaker the gas dispersion performance.

关 键 词：孔隙结构 压汞法 分形维数 瓦斯放散初速度 吸附特性 

分 类 号：TD712[矿业工程—矿井通风与安全]