不同通风方式下“110工法”采空区自燃“三带”数值模拟研究  

Numerical simulation study on“three zones”of spontaneous combustion in goaf by“110 construction method”under different ventilation modes

作　　者：文虎 孟尧[1,2] 樊世星 徐奕铭 叶春辉 童校长[3] 宋金锁[1,2] WEN Hu;MENG Yao;FAN Shixing;XU Yiming;YE Chunhui;TONG Xiaozhang;SONG Jinsuo(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an 710054,China;Huainan Mining Group Co.,Ltd.,Huainan 232000,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]教育部西部矿井开采及灾害防治重点实验室,陕西西安710054 [3]淮南矿业(集团)有限责任公司,安徽淮南232000

出　　处：《煤矿安全》2024年第4期88-97,共10页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(52274227)。

摘　　要：为探究不同通风方式下“110工法”采空区自燃“三带”分布特征,以顾北矿1532(1)工作面“两进一回”通风方式为工程背景,基于风流控制方程、浓度组分方程和能量方程等,利用Fluent数值模拟方法建立煤自然发火多物理场耦合数值模型、工作面实时动态推进模型,模拟了3种通风方式下“110工法”采空区自燃“三带”分布特征。结果表明:随着工作面不断推进,在通风方式1(机巷侧和沿空留巷进风,回风巷回风)和通风方式2(机巷侧和回风巷进风,沿空留巷回风)条件下,采空区氧化自燃带均匀分布在运输巷侧、工作面中部和留巷侧,其氧气体积分数分布形状相差不大,采空区温度首先升高,开采约50 d后,最高温度出现在运输巷侧深部,且该位置温度不随工作面继续推进而升高;在通风方式3(沿空留巷和回风巷进风,机巷侧回风)条件下,采空区留巷侧氧化自燃带变宽2~4倍,工作面中部和运输巷侧明显变窄,采空区运输巷侧氧气体积分数较低,留巷侧氧气体积分数较高,漏风量明显增大。采空区高温位置主要出现在1532(1)工作面始采线留巷侧,且当工作面开采50 d后,此处采空区温度最高。综上所述并结合现场实际情况,对氧化自燃带宽度及位置进行分析,最终确定通风方式3更有利于防止煤自燃的发生,对矿井煤自燃的预防提供了理论指导。In order to explore the distribution characteristics of“three zones”of spontaneous combustion in goaf under different ventilation modes,based on the engineering background of“two into one”ventilation mode at 1532(1)working face of Gubei Mine,and based on airflow control equation,concentration component equation and energy equation,by using the Fluent numerical simulation method,the multi-physical coupling numerical model of coal spontaneous combustion and the real-time dynamic advance model of working face are established,and the distribution characteristics of“three zones”of spontaneous combustion in goaf by the“110 construction method”under three ventilation modes are simulated.The results show that with the continuous advance of the working face,under the conditions of ventilation mode 1(air intake from the machine side and gob-side entry retaining,return air along the return air lane)and ventilation mode 2(air intake from the machine side and along the return lane,and return air in gobside entry retaining),the oxidation spontaneous combustion belt in the goaf is evenly distributed in the side of the belt machine,the middle of the working face and the side of the lane,and the oxygen concentration distribution is not much different.About 50 days after mining,the highest temperature appeared in the deep side of the transportation lane,and the temperature at this position did not increase with the continuous advance of the working face.Under the condition of ventilation mode 3(air intake in gob-side entry retaining and return air lane,and air return at the side of the machine lane),the oxidation spontaneous combustion belt at the side of the goaf retaining roadway becomes 2-4 times wider,the middle of the working face and the side of the belt conveyor become obviously narrow,the oxygen volume fraction at the side of the belt conveyor in the goaf is lower,the oxygen concentration at the side of the belt conveyor is higher,and the air leakage increases significantly.The high temperature location of

关 键 词：110工法 矿井通风方式 自燃“三带” 移动网格 氧气体积分数 

分 类 号：TD75[矿业工程—矿井通风与安全]