School of Safety Science and Engineering, Liaoning Technical University Hunan Provincial Key Lab of Safe Mining
Techniques of Coal Mines, Hunan University of Science and Technology MOE Key Lab of Mine Thermal Dynamic
Disaster and Prevention Research Institute of Energy Security and Application Technology, Liaoning Technical
University

为解决煤矿生产过程中的高温热害问题,基于煤矿采掘工作面的空间特征和工艺特点,提出了以液态CO2作为冷源的高温矿井液态CO2相变制冷降温技术,运用液态CO2相变释放的冷量与工作面的高温空气进行换热作用,降低工作面的环境温度及湿度,同时将相变产生的气态CO2注入采空区防治煤自燃。液态CO2相变制冷降温系统具有装置结构简单、操作方便、设备投入成本低、适应性强等优点。在板石煤矿52305掘进工作面进行液态CO2相变制冷降温技术的工业性试验。结果表明,液态CO2的平均消耗速率为1.015 m3/h时,掘进工作面空气温度降低了6.9℃,含湿量减少4.94g/kg,液态CO2的冷量利用率为77.36%。液态CO2相变制冷降温技术能够有效改善井下工作环境,具有较强的推广和应用前景。

In order to solve a high temperature and thermal disaster problems occurred in the production process of the coal mine, based on the space features an d technique characteristics of the heading face in the coal mine, a liquid carbon dioxide phase-change refrigeration and cooling technology with the liquid carbon dioxid e as the cooling sources of the high temperature coal mine was provided. The cooling volume released from the liquid carbon dioxide phase-change refrigeration and th e high temperature air from the heading face were applied to the heat exchange role conducted to reduce the environment temperature and humidity of the heading fac e. Meanwhile, the gas phase carbon dioxide from the phase-change would be injected to the goaf in order to prevent and control the coal spontaneous combustion. The liquid carbon dioxide phase-change refrigeration and cooling system would have a simple structure device, a convenient operation, low invested cost equipment, high s uitability and other advantages. A industrial trial of the liquid carbon dioxide phase-change refrigeration and cooling technology was conducted in No.52305 heading fac e of Banshi Mine. The results showed that when an average consumption rate of the liquid carbon dioxide was 1.015 m3/h, the air temperature of the heading face was reduced by 6.9。C, the humidity was reduced by4.94 g/kg and the uilization rate of the liquid carbon dioxide cooling volume was 77.36%. The liquid carbon dioxide pha se-change refrigeration and cooling technology could effectively improve the working environment in the underground mine and would have the high prospects of the pr omotion and application.