采空区瓦斯源位置对高位抽采的影响及优化措施研究  

Study on Impact of Gas Emission Location on High Suction Tunnel Gas Extraction and Its Optimization Countermeasures

作　　者：黄戈[1] 郝朝瑜[1] 张春华[2] 王雪峰[1] 

机构地区：[1]辽宁工程技术大学安全科学与工程学院,阜新123000 [2]辽宁工程技术大学矿业技术学院,葫芦岛125105

出　　处：《世界科技研究与发展》2016年第3期527-531,555,共6页World Sci-Tech R&D

基　　金：国家自然科学基金(51304112);辽宁省教育厅创新团队项目(LT2014138)资助

摘　　要：为提高高抽巷对采空区下部涌出瓦斯的治理效果,基于流体动力学、传质传热学理论,结合采场覆岩裂隙演化规律,构建三维多场耦合解算模型。运用Fluent软件分别模拟了采空区顶板、底板及整体涌出时的瓦斯运移积聚特征,并对高抽巷抽采和上隅角瓦斯浓度进行了量化对比分析。结果表明,顶板瓦斯涌出时,高浓度瓦斯积聚于采空区上部,主要靠分子扩散和机械弥散与下部漏风混合;采空区整体及底板瓦斯涌出时,"瓦斯-风流"的主要混合方式向对流扩散转变,采空区上部积聚瓦斯浓度降低,更多瓦斯随下部漏风涌向上隅角,高抽巷抽采浓度和上隅角瓦斯控制能力下降;此时,通过隅角封堵控制漏风,能够大幅提高抽采效率,在较低抽采流量条件下实现上隅角瓦斯治理。To improve gas extraction efficiency of high suction tunnel when gas emission near the floor of the goaf zone,the 3D numerical solution model is constructed based on Hydrodynamics,Heat and Mass transfer theory and the laws of fissure evolution in verifying strata.Using Fluent software,the distribution and accumulation of gas in 3D goaf is simulated with mainly gas emission from the entire goaf zone,the upper and the lower adjacent layers respectively,and a quantitative comparative analysis of gas concentration in high suction tunnel and the upper corner is carried out under different drainage quantity.Numerical simulation results provide us with the following conclusions： With the gas emission location drop from the top to the bottom of the goaf zone,the major mixing mode of gas and airflow is changed from molecular diffusion and mechanical dispersion to convection diffusion; The gas concentration at the top of goaf is decreased significantly and more gas mixed with air leakage flowing to the upper corner in lower goaf,which result in a lower volume fraction concentration of extracting gas from high suction tunnel,and the gas concentration often seriously beyond the allowed level in the upper corner of working face; In the circumstances,to reduce the goaf air leakage by plugging the working face upper and lower corner can greatly improve the gas extraction efficiency of high suction tunnel,it also can dissipate gas accumulating in upper corner of coal face effectively even more in a condition of lower drainage quantity from high suction tunnel.

关 键 词：采空区 涌出源位置 高抽巷 瓦斯运移 瓦斯抽采 数值模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]