College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
Environ Sci Pollut Res Int. 2023 Sep;30(45):101709-101724. doi: 10.1007/s11356-023-29515-4. Epub 2023 Sep 1.
The gas accumulation in the return corner of a high-gas fully mechanized mining face can easily cause the gas volume fraction to exceed the safety limit, threatening the safety of coal mines. In this study, the unit method was used to analyze the gas sources and emissions based on the actual case. The airflow and gas distribution characteristics of the two-inlet-one-outlet (TIOO) ventilation system and the one-inlet-two-outlet (OITO) ventilation system were studied using CFD numerical simulation. The results show that under the TIOO ventilation system, the "U"-type air leakage in the goaf leads deep gas into the return corner, which causes the gas volume fraction in the return corner to rise to 0.4-2.0%. After the mining face is optimized into the OITO ventilation system, the "J"-type air leakage of the goaf suppresses the high concentration of gas in the deep position of the goaf. Combined with the gas extraction measures, the gas volume fraction in the return corner, exhaust roadway's outlet, and retaining roadway's outlet is controlled at 0.28%, 0.34%, and 0.23%. This study will provide new ideas for solving the problem of gas accumulation in the return corner of a high-gas fully mechanized mining face.
在高瓦斯综采工作面回风隅角容易积聚瓦斯，导致瓦斯体积分数超过安全限值，威胁煤矿安全。本研究采用单元法，基于实际案例分析了瓦斯来源和排放。使用 CFD 数值模拟研究了双进一出（TIOO）通风系统和单进两出（OITO）通风系统的风流和瓦斯分布特性。结果表明，在 TIOO 通风系统下，采空区的“U”型漏风将深部瓦斯带入回风隅角，导致回风隅角的瓦斯体积分数上升至 0.4-2.0%。在将工作面优化为 OITO 通风系统后，采空区的“J”型漏风抑制了采空区深部的高浓度瓦斯。结合瓦斯抽采措施，回风隅角、回风巷出口和回风巷出口的瓦斯体积分数分别控制在 0.28%、0.34%和 0.23%。本研究为解决高瓦斯综采工作面回风隅角瓦斯积聚问题提供了新思路。
