回采工作面上隅角瓦斯拖管抽采技术参数研究  

Parameters of gas tube extraction technology in the upper corner of working face

作　　者：吴兵[1] 雷柏伟[1] 华明国[1] 管海鹤[1] 赵志研[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《采矿与安全工程学报》2014年第2期315-321,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51274205)

摘　　要：针对传统埋管抽放上隅角瓦斯技术中抽放点在空间位置不连续抽放效果差、管材浪费严重抽放成本高等重大缺陷,提出了上隅角瓦斯拖管抽采技术,可使抽放点匹配工作面推进速度,实现了采空区瓦斯抽放最佳效果的连续性,并且能回收管材降低抽放成本。采空区瓦斯抽放最佳位置的选择即抽放参数的确定是成功实现上隅角瓦斯拖管抽放的关键。利用Brinkman方程、菲克扩散定律和瓦斯扩散平移方程来描述瓦斯的流动扩散行为,建立工作面瓦斯流动多物理场耦合模型,并利用Fluent对模型进行求解,从而确定拖管抽放最佳布置参数,并对其进行实际应用和效果测试。结果表明:数值模拟和现场测试结果基本一致,最终确定了最佳抽放点位置为距离底板2.4 m、沿倾斜方向距离回风巷道1.57 m、沿走向深入采空区17.4 m处;应用期间杜绝了上隅角瓦斯超限,上隅角瓦斯拖管抽采技术具有较好的适用性和可行性。In view of the bad extraction effect for discontinuous space position of extraction point, serious waste of pipe and high extraction cost in the traditional buried tube gas extraction technology in upper comer of working face, the gas tube extraction technology in the upper comer was introduced in this paper, which can make the extraction point matching the face advancing speed, realize the continuity of the best goaf gas extraction effect, recover pipes and materials, and reduce the extraction cost. The selection of optimal location of goal gas extraction, namely the determination of extraction parameters, is the successful implementation of gas tube extraction of the upper comer. The behavior of gas diffu- sion and flow were described by using Brinkman equation, Fick diffusion law and gas diffusion translation equation, and the multi-physical field coupling model of gas flow in working face was established. Then, the optimal layout parameters of the tube extraction were determined by Fluent calculation of the model, and was applied to the practice and effect test. The results show that the numerical simulations are basically in accordance with the field test results, and the optimum extraction position has been determined as 2.4 m from the floor, 1.57 m from the air-return roadway along the inclined direction, and 17.4 m deep into the goal along the strike. Gas overrun in the upper comer has been eliminated during the application, which proves that the gas tube extraction technology in the upper comer has a good applicability and feasibility.

关 键 词：上隅角 拖管抽采技术 耦合模型 FLUENT 

分 类 号：TD712[矿业工程—矿井通风与安全]