Application of Local Refrigeration and Cooling Technology in Underground Long-distance Excavation Tunnel
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.
mineral engineeringdeep minesheat damagelong distance excavationlocal refrigeration and cooling technologyLinglong gold mine
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