摘要
为研究冻结煤层温度场演化规律,针对煤层注液冷冻防治煤与瓦斯突出方法,建立热流固(THM)耦合方程,应用COMSOL软件分析冻结过程中渗透率、温度场、有效冻结半径等参数的时空演化规律,并对不同布孔方式冻结效果进行对比。研究结果表明:冻结过程中渗透率与有效冻结半径均先快速增加后缓慢增加,有效冻结半径随冻结时间增加呈幂函数关系;多孔布置冻结孔时,随冻结时间增加,有效冻结范围增大;同一冻结时间,距冻结孔越远,温度变化越缓慢,研究结果可为冻结煤层防治煤与瓦斯突出提供理论指导。
In order to study the evolution law of temperature field in the frozen coal seam,aiming at the method for the prevention and control of coal and gas outburst by liquid injection and freezing in the coal seam,a thermo-fluid-solid(THM)coupling equation was established,and the COMSOL software was used to analyze the temporal and spatial evolution law of permeability,temperature field,effective freezing radius and other parameters in the freezing process,and the freezing effect of different hole arrangement methods were compared.The results showed that during the freezing process,both the permeability and the effective freezing radius increased rapidly first and then slowly,and the effective freezing radius presented a power function relationship with the freezing time.When arranging multiple freezing holes,as the freezing time increased,the effective freezing range increased.Under the same freezing time,the farther away from the freezing hole,the slower the temperature change.The results provide theoretical guiding for the prevention and control of coal and gas outburst in the frozen coal seams.
作者
刘军
卫彦昭
王蔚
张露伟
LIU Jun;WEI Yanzhao;WANG Wei;ZHANG Luwei(Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo Henan 454003,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454003,China;School of Emergency Management,Henan Polytechnic University,Jiaozuo Henan 454003,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2022年第9期89-96,共8页
Journal of Safety Science and Technology
基金
国家自然科学基金项目(51874122)
河南省科技攻关项目(202102310545)
河南省高校基本科研业务费专项项目(NSFRF210426)。
关键词
THM耦合
冻结煤层
温度场演化
渗透率演化
有效冻结半径
THM coupling
frozen coal seam
temperature field evolution
permeability evolution
effective freezing radius
