瓦斯抽采钻孔受液氮冷冲击作用的影响范围研究  

Study on the influence range of liquid nitrogen cold impact on gas extraction borehole

作　　者：张仰强[1,2] ZHANG Yangqiang(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2020年第3期100-104,共5页Mining Safety & Environmental Protection

基　　金：国家自然科学基金面上项目(51774319)。

摘　　要：为研究瓦斯抽采钻孔受液氮冷冲击作用的影响范围,采用理论分析的方法,基于传热学理论,建立了液氮冷冲击作用下钻孔周围煤体温度分布的数学物理方程,并充分考虑煤体内水含量与相变潜热的影响,获得了瓦斯抽采钻孔受液氮冷冲击作用的影响范围的解析解。分析了煤层的原始温度、导热系数和含水量等因素对瓦斯抽采钻孔受液氮冷冲击作用的影响,结果表明:液氮冷冲击作用的影响范围受煤层的原始温度的控制最为明显,其次是煤层的导热系数、煤体的含水量。In order to study the influence range of the gas extraction borehole under the cold impact of liquid nitrogen,using theoretical analysis and based on heat transfer theory,the mathematical and physical equation of coal temperature distribution around the borehole under the cold impact of liquid nitrogen was established,and the influence of water content in coal and the latent heat of phase change was fully considered.The analytical solution of the influence range of gas extraction borehole by liquid nitrogen cold impact was obtained.The influences of the original temperature,thermal conductivity and water content of coal seam on the cold impact of liquid nitrogen on gas extraction borehole were analyzed.The results show that the influence range of liquid nitrogen cold impact is most obviously controlled by the original temperature of the coal seam,followed by thermal conductivity of the coal seam and coal water content.

关 键 词：瓦斯抽采 钻孔 煤体增透 液氮 冷冲击作用 影响范围 

分 类 号：TD712[矿业工程—矿井通风与安全]