en.Wedoany.com Reported - The national key research and development program project "Research on Key Technologies for Efficient Development of Hot Dry Rock Geothermal Energy Using Ultra-Long Gravity Heat Pipes," led by the Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, has passed comprehensive performance evaluation and completed its final acceptance.
The project was led by researcher Jiang Fangming from the Guangzhou Institute of Energy Conversion. Over three years of intensive research, the project team established a deep geothermal ultra-long gravity heat pipe technology system covering the entire chain of "heat extraction-heat transfer-heat utilization," achieving a leap from theory to engineering application for this transformative heat extraction and utilization technology.
The project achieved multiple results in core technologies, equipment development, and engineering demonstrations. In terms of core technologies, the project team pioneered an ultra-long gravity heat pipe structure featuring "gas-liquid separation + stepped reflux," overcoming the technical challenge of efficient heat transport over thousands of meters with near-zero exergy loss, and built the world's first modular production line for ultra-long gravity heat pipes. The team also pioneered coaxial microwave radiation reservoir creation technology and developed medium-to-low temperature, wide-load ammonia turbine generator sets and adsorption refrigeration units.
In engineering demonstrations, a comprehensive deep geothermal energy utilization demonstration project integrating "heat pipe heat extraction-power generation-refrigeration-heat supply" was established in Caofeidian, Tangshan, Hebei Province. It achieved 168 hours of continuous power generation and refrigeration operation, with a peak heat extraction power of 3355 kW, a maximum power generation capacity of 33 kW in power generation mode, and the ability to supply approximately 55°C hot water to about 40,000 square meters of buildings in heating mode, with operating costs approaching zero.
The above indicators represent leading levels among publicly reported single-well closed geothermal systems both domestically and internationally. Additionally, a medium-deep geothermal heating demonstration project combining heat pipes with heat pumps, built in Xixian County, Shanxi Province, has completed commercial operation for two full heating seasons, covering a heating area of approximately 18,000 square meters, with a system comprehensive energy efficiency ratio (COP) greater than 5.2, the highest energy efficiency level in the industry under equivalent conditions.
During the project execution period, a total of 42 high-level papers were published, 31 invention patents were applied for, two group standards were led for release, and the core technologies were included in the "National Key Promotion Catalog of Low-Carbon Technologies (Fifth Batch)" and several national or local technology catalogs.
This project is one of the major research tasks led by the Guangzhou Institute of Energy Conversion in the field of deep geothermal energy. The research results provide an innovative technical solution for the efficient, clean, and large-scale development and utilization of deep geothermal energy in China, playing a significant supporting role in promoting energy structure transformation and serving the national "dual carbon" strategic goals.
