Wang Kai, Sun Chuanwen, Ai Zibo, Li Shouding
Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining & Technology (Beijing), Beijing, 100083, China.
School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China.
Environ Sci Pollut Res Int. 2023 Jan;30(4):9456-9470. doi: 10.1007/s11356-022-22503-0. Epub 2022 Sep 3.
The airflow exchange between the mine ventilation system and the surface atmosphere can influence ventilation effectiveness and emit more greenhouse gas from the mine for shallow cover mines. This airflow exchange also changes the airflow dynamics at the ventilation system, specially at the tailgate corner of the longwall. In this study, the fix-point traverse technique was employed to conduct a comprehensive survey at a coal mine longwall face and tailgate region. The air velocity, oxygen and carbon monoxide concentrations, barometric pressure, and temperature were measured and surveyed. Based on the survey data, the airflow pattern and gas concentration were analyzed at return air corner on the tailgate side. Based on the measurement and analyses, it was found that the airflow at the face can be broken into two compartments by the hydraulic cylinder. These two compartments can periodically exchange the air at the face. This can influence the abnormal gas concentration for the release of carbon monoxide from the gob attributed from coal spontaneous combustion. Also, our study provided detailed information for more understanding of airflow in working face and gob by simulation method in the future work.
对于浅埋煤层矿井，矿井通风系统与地表大气之间的气流交换会影响通风效果，并使矿井排放更多温室气体。这种气流交换还会改变通风系统中的气流动力学，特别是在长壁工作面的回风隅角处。在本研究中，采用定点测量技术对某煤矿长壁工作面和回风巷区域进行了全面调查。测量了风速、氧气和一氧化碳浓度、气压和温度。基于测量数据，分析了回风巷一侧回风隅角处的风流模式和气体浓度。通过测量和分析发现，工作面风流可被液压支架分为两个区域，这两个区域会周期性地进行空气交换，这会影响由于煤炭自燃导致采空区一氧化碳释放的异常气体浓度。此外，我们的研究为未来通过模拟方法更深入了解工作面和采空区内的风流提供了详细信息。
