大面积采空区煤自燃环境下气体运移规律研究  

Study on gas migration law in large area goaf under coal spontaneous combustion environment

作　　者：张鹏宇 陈晓坤 赵亮[3] 魏高明 王奇 ZHANG Pengyu;CHEN Xiaokun;ZHAO Liang;WEI Gaoming;WANG Qi(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Coal Fire Disaster Prevention,Xi'an University of Science and Technology,Xi'an 710054,China;Baodian Coal Mine,Yankuang Energy Group Company Limited,Zoucheng 273500,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西安科技大学煤火灾害防治陕西省重点实验室,陕西西安710054 [3]兖矿能源集团公司鲍店煤矿,山东邹城273500

出　　处：《煤矿安全》2022年第9期122-128,136,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(52174206);山东省重大科技创新工程资助项目(2019SDZY0205);陕西省教育厅青年创新团队资助项目(21JP074)。

摘　　要：大面积采空区漏风流场复杂、漏风规律不明确,一旦发生煤自燃,将威胁矿山安全。以山东省鲍店煤矿大面积采空区为例,通过现场观测和数值模拟等方法,研究大面积采空区温度场、气体渗流场和气体浓度场等复杂流场的动态变化和耦合关系,并分析煤自燃高温对大面积采空区气体运移的影响。结果表明:压力是诱导大面积采空区内部气体运移的直接动力;受热浮力作用影响,气体的流动方向发生改变,采空区底部的负压区域卷吸周边O向采空区上部的高压区域运移并积聚,扩大采空区氧化升温带范围并加速煤自燃;通过控制采空区漏风源风速,可以降低大面积采空区自燃风险,同时控制采空区深部有害气体涌出。The air leakage flow field in large area goaf is complex, and the air leakage law is not clear. Once coal spontaneous combustion occurs, it will threaten the safety of the mine. In this study, taking the large area goaf of Baodian Coal Mine in Shandong Province as an example, the dynamic changes and coupling of complex flow fields such as temperature field, gas seepage field and gas concentration field in the large area goaf are studied by means of field observation and numerical simulation.The relationship between coal spontaneous combustion and high temperature on gas migration in large area goaf is analyzed. The results show that pressure is the direct driving force to induce gas migration in large area goaf. Under the influence of thermal buoyancy, the flow direction of the gas changes, Oaround the suction area migrates and accumulates to the high pressure area at the top of the goaf in the negative pressure area at the bottom of the goaf, expanding the range of oxidation heating zone in the goaf and accelerating the spontaneous combustion of coal. By controlling the wind speed of the air leakage source in the goaf, the risk of spontaneous combustion in the goaf can be reduced, and the emission of harmful gases in the deep part of the goaf can be controlled.

关 键 词：大面积采空区 煤自燃 浮力效应 多场耦合 数值模拟 

分 类 号：TD752[矿业工程—矿井通风与安全]