采空区煤自燃耦合热浮力环境瓦斯运移规律研究  

Study on Gas Migration Law of Coal Spontaneous Combustion Coupling Thermal Buoyancy Environment in Goaf

作　　者：吴振超 施式亮 季鹏 WU Zhenchao;SHI Shiliang;JI Peng(School of Resource Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《煤炭技术》2024年第7期164-168,共5页Coal Technology

基　　金：国家自然科学基金资助项目(51974120,52274196)。

摘　　要：为了探讨煤自燃过程多场耦合之间协同动态变化规律的机制,准确划分瓦斯与煤自燃共生灾害区域,采用数值模拟的方法研究了采空区煤自燃区域热浮力作用下瓦斯运移过程。分析了温度场、瓦斯浓度场、气体密度和采空区风流运动特征的分布规律,划分了瓦斯与煤自燃共生灾害区域。模拟结果表明:瓦斯积聚是由热浮力影响下的上升气流、漏风风流和煤自燃点附近的卷吸气流共同作用形成的;入口风速增加时,共生灾害区域面积呈现先增大后减小的趋势,煤自燃区域向采空区中深部移动,瓦斯积聚浓度随着煤自燃温度升高而增加;煤自燃区域产生的热量积聚于小范围区域,与周围区域有较大的温度梯度;模拟得出的采空区煤自燃耦合热浮力作用下瓦斯运移规律,为采空区煤自燃灾害防治提供了参照依据。In order to explore the mechanism of synergistic dynamic change law between multi-field coupling of coal spontaneous combustion process,and accurately classify the co-hazardous area of gas and coal spontaneous combustion,numerical simulation was used to study the process of gas transportation under the action of thermal buoyancy in coal spontaneous combustion area in the mining hollow zone.The distribution law of temperature field,gas concentration field,gas density and wind flow characteristics in the mining area were analyzed,and the co-hazardous area of gas and coal spontaneous combustion was delineated.The simulation results show that:the gas accumulation is formed by the joint action of the rising airflow under the influence of thermal buoyancy,the airflow leakage and the entrainment flow near the point of spontaneous coal combustion;when the inlet wind speed is increased,the area of the symbiotic disaster area shows a tendency of increasing and then decreasing;the area of spontaneous coal combustion is moving to the middle and deep part of the mining area,and the concentration of the gas accumulation increases with the increase in the temperature of the spontaneous coal combustion;the heat generated by the spontaneous coal combustion area is accumulated in the small-scale area,and there is a large temperature gradient with the surrounding area.The simulated gas transportation law under the action of coal spontaneous combustion coupled with thermal buoyancy in the air mining area provides a reference basis for the prevention and control of coal spontaneous combustion disaster in the air mining area.

关 键 词：煤自燃 热浮力作用 瓦斯运移 瓦斯积聚 风流运动 共生灾害 

分 类 号：TD712[矿业工程—矿井通风与安全] TD752