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Design and Optimization of an Alkaline Electrolysis System for Small-Scale Hydropower Integration

Author

Listed:
  • Hojun Song

    (Green and Sustainable Materials R&D Department, Research Institute of Sustainable Manufacturing System, Korea Institute of Industrial Technology, Cheonan-si 31056, Republic of Korea
    These authors contributed equally to this work and shared first authorship.)

  • Yunji Kim

    (Water Energy Research Center, Korea Water Resources Corporation, Daejeon 34045, Republic of Korea
    These authors contributed equally to this work and shared first authorship.)

  • Heena Yang

    (Water Energy Research Center, Korea Water Resources Corporation, Daejeon 34045, Republic of Korea)

Abstract

Alkaline electrolysis systems are currently considered to be suitable for large-scale hydrogen production. Previous research has primarily focused on integrating renewable energy sources such as solar and wind into water electrolysis systems. However, intermittent issues stemming from the sporadic nature of renewable energy sources have led to the introduction of energy storage systems (ESSs) to address these intermittent challenges. Extensive research has been conducted on the efficiency and operational aspects of these systems. In contrast to other renewable energy sources, hydropower offers the advantages of stable output and high utilization, making it a promising solution for overcoming intermittent issues. In this study, we propose the design of an optimized alkaline electrolysis system tailored for small-scale hydropower generation. This approach allowed us to confirm the efficiency of a small-scale hydropower-based hydrogen production facility and the analysis of hydrogen production costs under diverse scenarios. Notably, the optimal selling price per kilogram of hydrogen was determined to be USD 15.6 when the operational time exceeded 20 h, albeit indicating a challenging market supply. Under the consideration of various scenarios and government subsidies, this study revealed that a USD 10/kgH 2 subsidy or 24 h of continuous operation achieved break-even points in the sixth and eighth years, respectively. Ultimately, the findings underscore the necessity for essential measures, including government backing and technological advancements in small-scale hydropower facilities, to enhance the economic viability of the green hydrogen market in South Korea.

Suggested Citation

  • Hojun Song & Yunji Kim & Heena Yang, 2023. "Design and Optimization of an Alkaline Electrolysis System for Small-Scale Hydropower Integration," Energies, MDPI, vol. 17(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:17:y:2023:i:1:p:20-:d:1303504
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    References listed on IDEAS

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