摘要
为了研究煤中瓦斯的运移规律,首先建立了煤中瓦斯非恒定扩散系数模型,然后以不同粒径煤样为对象,通过改进的解吸实验装置研究了煤中瓦斯解吸-扩散特性,实验验证了该模型的可靠性。结果表明,通过建立煤中瓦斯非恒定扩散系数模型,得到了煤中瓦斯扩散过程中不同时刻条件下的扩散系数,获得了煤中瓦斯的非稳态扩散特征。煤样的初期解吸速度相对较快,随后逐渐降低;煤样粒径越小,瓦斯的总解吸量和解吸速度均越大,煤样接近解吸平衡时所用的时间越短。相同压力下,初始时刻煤样的有效扩散系数随着煤样粒径的增大而减小,解吸-扩散实验结果验证了上述模型具有较高的可靠性。
To research the gas migration laws in coal, the non-constant gas diffusion coefficient model of coal was established firstly and then adsorption and desorption and unsteady-state diffusion properties of the coal mass with different particle sizes were analyzed by the improved desorption experiment device, which was used to verify the above model. It was found that the diffusion coefficient at different time during the coal gas diffusing could be obtained and the unsteady-state gas diffusion properties would be acquired after the establishment of non-constant gas diffusion coefficient model. The initial desorption rate of coal samples is very fast and then gradually decreased; the smaller the coal sample particle size is, the greater the total desorption and desorption rate of gas is, and the shorter the needed time of coal sample closing to desorption equilibrium is. Under the condition of same gas pressure, the effective gas diffusion coefficient decreases with the increasing of particle size and the gas desorption and diffusion experiment results verify the high reliability of the above model.
作者
徐超
王硕
郭海军
付强
XU Chao;WANG Shuo;GUO Haijun;FU Qiang(State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology （Beijing）, Beijing 100083, China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology （Beijing）, Beijing 100083, China;School of Resources ＆ Safety Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454150, China)
出处
《煤矿安全》
CAS
北大核心
2018年第5期1-5,共5页
Safety in Coal Mines
基金
国家自然科学基金青年基金资助项目(51604278)
煤炭资源与安全开采国家重点实验室开放课题资助项目(SKLCRSM16KFD09)
河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金资助项目(WS2017B04)
关键词
煤样粒径
吸附/解吸特征
非稳态扩散
非恒定扩散系数
煤与瓦斯突出
particle size of coal sample
adsorption and desorption characteristics
unsteady-state diffusion
non-constant diffusioncoefficient
coal and gas outburst
