摘要
为了研究钻屑粒径差异对瓦斯放散初期特征的影响,开展恒温煤粒瓦斯放散实验,采用动扩散系数模型分析不同粒径原生煤与构造煤的瓦斯放散初期过程。研究结果表明:在0.25~3.00 mm粒径范围内,原生煤与构造煤的初期瓦斯解吸量均随粒径的增大而减小,相同粒径条件下构造煤初期瓦斯解吸量大于原生煤初期瓦斯解吸量;采用分数式衰减的动扩散系数模型能较好地描述煤粒瓦斯放散初期过程;原生煤与构造煤的初始扩散系数均随粒径的增大而增大,衰减系数均随粒径的增大而减小;原生煤与构造煤瓦斯放散初期过程产生差异的主要原因是孔隙结构不同。研究结果可为煤与瓦斯突出预测技术研究提供理论参考。
In order to study the influence of the particle size difference of drill cuttings on the characteristics of gas emission at initial stage,the gas emission experiments of coal particles at a constant temperature were conducted,and the dynamic diffusion coefficient model was used to analyze the initial process of gas emission of the original coal and tectonic coal with different particle sizes.The results showed that in the range of 0.25~3.00 mm particle size,both the initial gas desorption capacities of original coal and tectonic coal decreased with the increase of particle size.Under the same particle size,the initial gas desorption capacity of tectonic coal was greater than that of original coal.The dynamic diffusion coefficient model with fractional attenuation could better describe the initial process of gas emission of coal particle.Both the initial diffusion coefficients of original coal and tectonic coal increased with the increase of particle size,and both the attenuation coefficients decreased with the increase of particle size.The main reason for the difference in the initial process of gas emission between original coal and tectonic coal is the difference of pore structure.The research results provide theoretical reference for the research on prediction technology of coal and gas outburst.
作者
李博
游波
张慧杰
施式亮
鲁义
李贺
LI Bo;YOU Bo;ZHANG Huijie;SHI Shiliang;LU Yi;LI He(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第4期64-70,共7页
Journal of Safety Science and Technology
基金
煤炭科学技术研究院科技发展基金项目(2020CX-II-16)
2022年湖南省大学生创业训练项目(湘教通[2022]174号第3420项)
2022年大学生科研创新计划(SRIP)项目。
关键词
瓦斯放散
动扩散系数
构造煤
衰减系数
粒径
gas emission
dynamic diffusion coefficient
tectonic coal
attenuation coefficient
particle size
