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Heat Production Performance from an Enhanced Geothermal System (EGS) Using CO 2 as the Working Fluid

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Listed:
  • Wentao Zhao

    (National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Beijing 102209, China
    China Huaneng Clean Energy Research Institute, Beijing 102209, China)

  • Yilong Yuan

    (Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China)

  • Tieya Jing

    (National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Beijing 102209, China
    China Huaneng Clean Energy Research Institute, Beijing 102209, China)

  • Chenghao Zhong

    (Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China)

  • Shoucheng Wei

    (Fujian Branch of China Huaneng Group, Fuzhou 350000, China)

  • Yulong Yin

    (National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Beijing 102209, China
    China Huaneng Clean Energy Research Institute, Beijing 102209, China)

  • Deyuan Zhao

    (Fujian Branch of China Huaneng Group, Fuzhou 350000, China)

  • Haowei Yuan

    (National Key Laboratory of High-Efficiency Flexible Coal Power Generation and Carbon Capture Utilization and Storage, Beijing 102209, China
    China Huaneng Clean Energy Research Institute, Beijing 102209, China)

  • Jin Zheng

    (Fujian Branch of China Huaneng Group, Fuzhou 350000, China)

  • Shaomin Wang

    (Fujian Branch of China Huaneng Group, Fuzhou 350000, China)

Abstract

CO 2 -based enhanced geothermal systems (CO 2 -EGS) are greatly attractive in geothermal energy production due to their high flow rates and the additional benefit of CO 2 geological storage. In this work, a CO 2 -EGS model is built based on the available geological data in the Gonghe Basin, Northwest China. In our model, the wellbore flow is considered and coupled with a geothermal reservoir to better simulate the complex CO 2 flow and heat production behavior. Based on the fractured geothermal reservoir at depths between 2900 m and 3300 m, the long-term (30-year) heat production performance is predicted using CO 2 as the working fluid with fixed wellhead pressure. The results indicate that the proposed CO 2 -EGS will obtain an ascending heat extraction rate in the first 9 years, followed by a slight decrease in the following 21 years. Due to the significant natural convection of CO 2 (e.g., low viscosity and density) in the geothermal reservoir, the mass production rate of the CO 2 -EGS will reach 150 kg/s. The heat extraction rates will be greater than 32 MW throughout the 30-year production period, showing a significant production performance. However, the Joule–Thomson effect in the wellbore will result in a drastic decrease in production temperature (e.g., a 62.6 °C decrease in the production well). This means that the pre-optimization analyses and physical material treatments are required during geothermal production using CO 2 as the working fluid.

Suggested Citation

  • Wentao Zhao & Yilong Yuan & Tieya Jing & Chenghao Zhong & Shoucheng Wei & Yulong Yin & Deyuan Zhao & Haowei Yuan & Jin Zheng & Shaomin Wang, 2023. "Heat Production Performance from an Enhanced Geothermal System (EGS) Using CO 2 as the Working Fluid," Energies, MDPI, vol. 16(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:20:p:7202-:d:1265114
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    References listed on IDEAS

    as
    1. Lu, Shyi-Min, 2018. "A global review of enhanced geothermal system (EGS)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2902-2921.
    2. Liu, Gang & Zhou, Chunwei & Rao, Zhenghua & Liao, Shengming, 2021. "Impacts of fracture network geometries on numerical simulation and performance prediction of enhanced geothermal systems," Renewable Energy, Elsevier, vol. 171(C), pages 492-504.
    3. Singh, Mrityunjay & Mahmoodpour, Saeed & Ershadnia, Reza & Soltanian, Mohamad Reza & Sass, Ingo, 2023. "Comparative study on heat extraction from Soultz-sous-Forêts geothermal field using supercritical carbon dioxide and water as the working fluid," Energy, Elsevier, vol. 266(C).
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