Effects of seasonal air temperature variation on airflow and surrounding rock temperature of mines

International Journal of Coal Science & Technology

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[1] 0000 0004 0532 0820, grid.412127.3, Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, 64002, Douliou, Yunlin, Taiwan, ROC;0000 0004 1759 0801, grid.440720.5, Post-doctoral Research Center of Mining Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., 710054, Xi’an, Shaanxi, People’s Republic of China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 710054, Xi’an, People’s Republic of China;0000 0004 1759 0801, grid.440720.5, School of Safety Science and Engineering, Xi’an University of Science and Technology, 710054, Xi’an, People’s Republic of China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 710054, Xi’an, People’s Republic of China;

关键词: Seasonal variation;    Fiber optic temperature measurement;    Real-time monitoring;    Deep coal mine;    Thermal pollution;    Heat-adjusting layer;   

DOI  :  10.1007/s40789-019-00268-1

来源: publisher

【 摘 要 】

In underground mines, high air temperatures in the summer months lead to an increase in inlet airflow temperatures. This leads to seasonal thermal pollution in the mines. This paper examines the dynamics and effects of seasonal variation in surface air temperatures and surrounding rock temperatures in deep coal mines. It also examines temperature variations in the main ventilation circuit, working face, and surrounding rock. The study results revealed that airflow temperatures were significantly affected by seasonal air temperature variations. The greater the distance was between the inlet and the wellhead of the ventilation shaft, the less the effect was on temperature. Moreover, slight temperature variations (1.0–3.0 °C) were observed between various points on the return route during the summer months. Airflow temperatures along the airflow inlet to the return route of the working face first decreased, but then increased. The temperature field of the surrounding rock increased gradually with increased distance between the mine roadway and inlet, with recorded rock temperatures as high as 40.53 °C. The radius of the heat-adjusting layer was between 28 and 33 m.

【 授权许可】

CC BY