基于VUMA的某矿井下热环境模拟研究

Simulation on the Underground Thermal Environment of a Mine Based on VUMA

随着矿山开采深度的不断增加,井下环境存在的高温高湿问题日益凸显,严重威胁工人职业健康和生产安全。为了探究井下热环境的分布及其影响因素,采取针对性的降温措施,基于VUMA-3D对某矿井进行了井下热环境模拟,研究了地温梯度、围岩传热系数、设备功率、入风风速和入风风温等不同因素对井下热环境的影响规律。研究结果表明:地温梯度每增加0.001℃/m,巷道内温度增大0.75℃左右;入风风速每增大0.2 m/s,巷道温度降低0.8℃,巷道内风速达到2.4 m/s后,巷道温度降低幅度变为0.34℃;入风温度以0.62℃的梯度递减,回风温度以平均0.4℃递减;增大风速和降低风温相结合的降温效果更好,但是降温效果对风流不畅的巷道有限,采用局部通风方法后,巷道温度从28.3℃降低到27.5℃以下,高温热害得到改善。

As the mining depth continues to increase, the problems of high temperature and humidity in the underground environment have become increasingly prominent, which seriously threaten the occupational health of workers and the production safety. In order to explore the distribution of underground thermal environment and its influencing factors, so as to take targeted cooling measures, based on VUMA-3 D, underground thermal environment of a mine was simulated. And the influence laws of ground temperature gradient, surrounding rock heat transfer coefficient, equipment power, inlet wind speed, inlet wind temperature and other factors on the underground thermal environment were studied. The results are obtained, when the ground temperature gradient increases by 0.001℃/m, the temperature in the roadway increases by about 0.75℃. When the inlet wind speed increases by 0.2 m/s, the roadway temperature decreases by 0.8℃. After the wind speed in the roadway reaches 2.4 m/s, the decrease range in the roadway temperature is 0.34℃. The inlet air temperature decreases with a gradient of 0.62℃, and the return air temperature decreases with an average of 0.4℃. The combination of increasing the wind speed and reducing the wind temperature has a better cooling effect, but is limited to the cooling effect of roadway with poor air flow. After the local ventilation method is adopted, the roadway temperature reduces from 28.3℃ to below 27.5℃, and the high temperature heat damage is controlled.