Abstract
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.
Highlights
There are many large underground mines, defined as such on the basis of production, horizontal extent, and depth
This paper examines the dynamics and effects of seasonal variation in surface air temperatures and surrounding rock temperatures in deep coal mines
The study results revealed that airflow temperatures were significantly affected by seasonal air temperature variations
Summary
There are many large underground mines, defined as such on the basis of production, horizontal extent, and depth. Studies have been conducted on the origins of mine thermal pollution and methods for its detection and prevention. Effects of seasonal air temperature variation on airflow and surrounding rock temperature of. (2017) investigated the variation in temperature fields and heat transformation patterns of rocks surrounding mine shafts at different temperatures and humidity levels. The results indicated that cooling air could effectively reduce the temperature in mining areas. Very few studies have analyzed the effect of seasonal surface temperature variation on mine thermal pollution. Seasonal variation in surface air temperature has a considerable effect on the temperature field of surrounding rocks in the mine roadway, and on airflow temperature. Studying the influence of seasonal variations in ground air temperature on airflow and surrounding rock temperatures will help to evaluate, prevent, and control thermal pollution in underground mines. (1) Understanding how the main ventilation route of the mine is influenced by seasonal variations in airflow temperatures
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