Study on Enhanced Geothermal System of Carbon Dioxide Fracturing Dry Hot Rock

As a renewable energy source, the effective way to mine dry-hot rock is to form dry-hot rock enhanced geothermal system (EGS). Enhanced geothermal system is the key technology to realize the development and utilization of dry-hot rock geothermal energy resources. Compared with the traditional enhanced geothermal system (water-EGS), the new enhanced geothermal system (CO2-EGS), which uses carbon dioxide as the heat carrier has multiple advantages of energy saving, high efficiency and greenhouse gas emission reduction. CO2 has a strong heat recovery capacity, and is unlikely to chemically react with the thermal reservoir, and the additional effect of geological storage can be obtained at the same time. This study reviews the evolution and practical applications of enhanced geothermal energy. By integrating insights from domestic and international research advancements, the feasibility and advantages of CO2 as heat-carrying working medium are analyzed, and the problems to be optimized and solved are discussed.