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Recently, the first domestic demonstration project that combines transcritical carbon dioxide refrigeration with heat recovery from coal mines – the Phase II project of Huaihe Energy Zhangji Coal Mine, focusing on transcritical CO2 underground refrigeration and surface heat utilization – officially commenced construction. The commencement of this project marks a significant technological breakthrough in the field of underground cooling in China, offering innovative solutions for addressing the problem of heat damage in traditional coal mines. It will enable the mining industry to make a leap forward from passive cooling methods to a coordinated model that combines cooling, energy storage, and energy utilization. The project utilizes transcritical CO2 refrigeration technology, with carbon dioxide serving as a natural and environmentally friendly refrigerant. Through underground cooling and ground-based heat utilization systems, it achieves efficient cooling in high-temperature areas underground, while also addressing the issue of high humidity there. Compared to traditional refrigeration systems, it offers three advantages: environmental protection with zero pollution, improved energy efficiency, and reuse of thermal energy. Through integrated management of the entire process from technology research and development to engineering design and construction, as well as through collaborative efforts, Sanhua Jian has overcome 12 technical challenges related to the safe use of CO₂ underground and the integration of heat and cold supply systems. It has developed 3 core patented technologies. Application technologies such as safe design of protective layers and pipeline stress analysis in mine engineering provide strong technical support for the large-scale use of CO₂ under special conditions in mines.