基于动扩散模型多尺度粒煤瓦斯进扩散特性研究  

Study on Gas Internal Diffuse Characteristics of Multi-scale Coal Based on Dynamic Diffuse Model

作　　者：段正鹏 张书金 李志强[3] 李国红 李青松 DUAN Zhengpeng;ZHANG Shujin;LI Zhiqiang;LI Guohong;LI Qingsong(Guizhou Mine Safety Scientific Research Institute Co.,Ltd.,Guiyang 550025,China;Guizhou Coal Mine Safe and Efficient Mining Technology Support and Service Talent Base,Guiyang 550025,China;MOE Engineering Center of Mine Disaster Prevention and Rescue,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]贵州省矿山安全科学研究院有限公司,贵阳550025 [2]贵州省煤矿安全高效开采技术支撑与服务人才基地,贵阳550025 [3]河南理工大学煤矿灾害预防与抢险救灾教育部工程研究中心,河南焦作454000

出　　处：《煤炭技术》2022年第11期117-121,共5页Coal Technology

基　　金：贵州省省级科技计划项目资助(黔科合支撑[2021]一般348,[2022]一般005,[2020]2Y056)。

摘　　要：为了考察多尺度低渗煤瓦斯吸附进扩散特性及瓦斯在粒煤多孔介质内质量浓度分布规律,以典型低渗煤为实验对象开展了微米级和毫米级共5种粒径粒煤的扩散实验,采用动扩散系数模型计算了不同条件下的初始扩散系数D0值和有效扩散系数D0e,获得了5种尺度的粒煤在0.5、3.0 MPa条件下的CH4质量浓度分布规律。研究发现:动扩散系数模型可准确描述CH4在不同尺度粒煤内的扩散规律,最大误差为3.8%;初始扩散系数D0值随粒度增大最大扩大了47.7倍,有效扩散系数D0e值随粒径增大最大减小了97%;为保证扩散实验精度,建议高压下微米级(0.18~1 mm)粒煤吸附时长应达到10 h,毫米级(1~10 mm)粒煤吸附时长应达到46 h,更大尺度粒煤应进一步延长吸附时长。To study the gas adsorb and diffuse characteristics of multi-scale low-permeability coal and the mass concentration distribute law of gas in coal,taking typical low-permeability coal as the experimental object,five kinds of granular coal diffuse experiments of micron scale and millimeter scale are carried out.The dynamic diffuse coefficient diffuse model is used to calculate the initial diffuse coefficient D0and effective diffuse coefficient D0e,and the CH4quality concentration distribute law o granular coal under the conditions of 0.5 MPa and 3.0 MPa is obtained.It is found that the dynamic diffuse coefficient model can accurately describe the diffuse law of CH4in different sizes of coal,and the max error is 3.8%;the initial diffuse coefficient D0increased by 47.7 times with the increase o particle size,and the effective diffuse coefficient D0edecreased by 97%with the increase of particle size;to ensure the accuracy of diffuse experiment,under high pressure environment,it′s suggested the adsorb time of micron (0.18-1 mm) granular coal should reach 10 h,the adsorb time of millimeter (1-10 mm) granular coal should reach 46 h,and the adsorb time of larger scale coal should be further extended.

关 键 词：吸附 质量浓度分布 动扩散模型 

分 类 号：TD712.3[矿业工程—矿井通风与安全]