School of Mechanical and Electrical Engineering,North China Institute of Science and Technology
Yaoqiao Coal Mine,Shanghai Datun Energy Co. ,Ltd.

针对窄煤柱复合采空区内气体流动规律复杂、注惰气技术灌注参数选择难度较大、惰气易涌入工作空间等问题,以姚桥煤矿7271工作面采空区及相邻7269采空区为研究对象,采用理论分析和数值模拟相结合的方法,建立窄煤柱复合采空区气体输运数学模型,研究了压注CO2前后复合采空区的气体流动特征,确定了复合采空区最优惰化参数。研究结果表明:注CO2后,氧化带总体向7271工作面移动,CO2向采空区深部及回风巷方向移动;随着注气量增大,煤柱内部氧化带最大宽度由3.77m减小至1.76m,煤柱隔绝O2的效果增强;相邻的7269采空区CO2呈走向范围大、倾向范围小的扩散态势,随着注气量的增大,CO2抑制O2扩散的效果更加明显;建立数学模型评判,确定CO2最佳注入量为750m3/h。

In response to the complex gas flow patterns within narrow coal pillar in compound goafs,the challenges in selecting inert gas injection parameters,and the tendency for inert gases to intrude into working spaces,using the working face and the adjacent goaf of Yaoqiao Coal Mine as case studies. This study employs a combined approach of theoretical analysis and numerical simulation. Mathematical model for gas transport in narrow coal pillar compound goafs was established to investigate the gas flow characteristics before and after CO injection. The optimal inerting parameters for the compound goaf were determined. The results indicate that after CO injection,the oxidative zone generally shifts towards the working face,while CO moves deeper into the goaf and towards the return airway. As the gas injection volume increases,the maximum width of the oxidative zone within the coal pillar decreases from 3. 77 m to 1. 76 m,enhancing the coal pillar’s effectiveness in isolating O . In the adjacent goaf,CO exhibits a wide directional diffusion range with a smaller inclination range;as the injection volume increases,the suppression of O diffusion by CO becomes more pronounced. Mathematical model evaluation determines the optimal CO injection rate to be m / h.

河北省自然科学基金面上项目(E2021508010);国家自然科学基金面上项目(52074122);国家自然科学基金青年科学基金项目(51804120)

司俊鸿,王攀昊,梁红立,等.窄煤柱复合采空区压注CO2惰化参数优化研究[J].矿业安全与环保,2024,51(5):15-22.

SI Junhong,WANG Panhao,LIANG Hongli,et al. Study on the optimization of CO2 inerting parameters in narrow coal pillar compound goaf[J]. Mining Safety & Environmental Protection,2024,51(5):15-22.