Cooling effect evaluation of assembled convection-radiation refrigeration system under deep mine

Artificial cooling technology is one of the most effective methods for deep well heat damage management. The current cooling method is dominated by all-air cooling, which reveals many problems such as cooling effect of “near-cold and far-hot”, huge energy consumption and so on, which is contrary to the national green mine development strategy. The assembled convection-radiation cooling system is a kind of local cooling device integrating support and cooling, which can be installed in the area of the working face that needs to be cooled to create a local comfortable thermal environment. In order to study the cooling effect of the assembled convection-radiation refrigeration system, theoretical analysis and CFD simulation methods were used to obtain the mathematical model of the system’s cooling capacity; the cooling mechanism of the system was analyzed to optimize the operating conditions; and the cooling effect of the system was evaluated by taking the working face of Zhangshuanglou Mine 7119 as an example. The results show that: the combination of assembled high-temperature mine convection-radiation cooling system and side-helm support system can realize the synchronization of roadway mining, support and environmental improvement, and improve the production efficiency and environmental comfort. The optimal operating conditions of the assembled high-temperature mine convection-radiation cooling system are as follows: the refrigerant flow rate is 0.2 m/s, the inlet air velocity is 0.6 m/s, the height of the air outlet is set at 60 mm, and the cooling capacity of the system is 269 W. The cooling capacity of the system is 0.2 m/s, the inlet air velocity is 0.6 m/s, and the height of the air outlet is set at 60 mm. The cooling effect of the assembled high-temperature mine convection-radiation cooling system (to meet the demand for comfort) has been improved by 31% compared with the all-air type cooling method of the roadway, which can meet the demand for comfortable environment for the adapted workers in the quarry within the mining depth of 2000 m, and the system is able to maximize the thermal safety of the miners. At the same time, according to the cooling needs of the site, adjust the equipment installation spacing, local environmental control, and greatly save cooling energy consumption. The research can be used to guide the local environmental control of the mine quarry, the efficient and precise cooling of the intelligent less manned working face, and the protection of miners’ occupational health, which fully responds to the national development strategy of green mines and helps the realization of the national dual-carbon goal.