局部制冷降温技术在井下长距离掘进中的应用

Application of Local Refrigeration and Cooling Technology in Underground Long-distance Excavation Tunnel

为解决玲珑金矿深部长距离掘进巷道的高温问题,结合井下低温涌水条件,通过对输冷方式和换热方式进行分析,制定了以水源热泵技术为基础的局部制冷降温技术方案,采用理论计算和模拟仿真方法,模拟不同供风温度和供风量条件下巷道的温度场变化情况,分析得出了最佳制冷参数,并开展了制冷系统的设备选型和现场应用。结果表明:-750 m中段长距离掘进工作面的制冷最佳温度为10℃,供风量为5.0 m3/s;根据制冷方案和制冷参数分析结果对局部制冷降温技术进行了应用,有效解决了系统供水不足和供风沿途冷损大等难题,掘进工作面温度由37.0℃降至26.2℃,降幅达10.8℃,距工作面50 m范围内运输巷道温度平均降幅分别为8.9℃和2.9℃,掘进巷高温环境得到明显改善。该局部制冷通风降温技术的应用对类似矿山的深部热害治理具有技术参考价值。

As the issue of elevated temperatures in deep mining operations becomes increasingly significant,the implementation of cooling technologies has become widespread.Among these,water source heat pump cooling technology,which utilizes low-temperature subterranean water as a cooling source,offers distinct advantages over traditional ice cooling and air conditioning systems.Specifically,it is characterized by superior energy efficiency,environmental sustainability,and operational effectiveness.The west wing excavation tunnel of the Linglong gold mine at the-750 m section is influenced by factors such as inlet air temperature,ground temperature,and equipment heat dissipation,leading to a working face temperature of up to 37℃.Efforts to mitigate this by increasing the inlet air volume and altering the ventilation method,have proven ineffective in significantly reducing the working face temperature.To address this issue,this study leverages the presence of substantial low-temperature groundwater,conducts an analysis of cooling and heat transfer mechanisms,and proposes a localized cooling technology scheme based on water source heat pump technology.Utilizing theoretical calculations and simulation methodologies,the variations in the temperature field of the tunnel under different supply air temperature and volume conditions were simulated.This analysis facilitated the determination of optimal cooling parameters and cooling capacity.Additionally,the selection of equipment and the practical application of the cooling system were conducted.The findings indicate that a localized cooling scheme,which involves positioning the refrigeration unit at the working face,offers a simpler structure,and is more economical and practical.The optimal cooling temperature for long-distance excavation in the-750 m section is determined to be 10℃,with a supply air volume of 5.0 m3/s and a cooling capacity of 300.36 kW,serving as a reference for equipment selection.During the on-site application,the establishment of a water storage tank and the implementation of spray cooling measures effectively addressed the issues of insufficient water supply in the refrigeration system and significant cooling loss along the air supply route.Consequently,the temperature at the excavation working face decreased from 37.0℃to 26.2℃,a reduction of 10.8℃.The average temperature reduction within a 50-meter radius of the working face and the transportation roadway was 8.9℃and 2.9℃,respectively.This indicates a significant improvement in the high-temperature conditions of the excavation tunnel.The implementation of this localized cooling technology provides a valuable technical reference for addressing deep heat issues in similar mining environments.