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A novel design of solid oxide electrolyser integrated with magnesium hydride bed for hydrogen generation and storage – A dynamic simulation study

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  • Chen, Bin
  • Xu, Haoran
  • Zhang, Houcheng
  • Tan, Peng
  • Cai, Weizi
  • Ni, Meng

Abstract

This paper proposes a novel solid oxide steam electrolyser with in-situ hydrogen storage by integrating a magnesium hydride (MH) section with proton-conducting solid oxide electrolysis cell (SOEC) section. Dynamic simulation results show that it takes 1950 s to fully charge the MH section with a 56% H2 storage efficiency without any flow recirculation, when the electrolyser is operated at 1.4V and 4atm, yielding a current density of 4956.40 A/m2. The evolution of temperature, H2 partial pressure and reaction of Mg powder through the charging process are analysed. It is found that the exothermic H2 absorption process of MH section can enhance the performance of the electrolysis process of SOEC section. The effects of operating parameters including operating pressure, electrolysis voltage, and cooling air temperature on the performance of the novel design are investigated by sensitivity studies. Results show that it is beneficial to operate the electrolyser at elevated pressure for shorter absorption time and higher H2 storage efficiency. Increasing the operating voltage can shorten the absorption time, but lower H2 storage efficiency. An optimal cooling air temperature is found at 521K when the electrolyser is operated at 1.4V and 4atm.

Suggested Citation

  • Chen, Bin & Xu, Haoran & Zhang, Houcheng & Tan, Peng & Cai, Weizi & Ni, Meng, 2017. "A novel design of solid oxide electrolyser integrated with magnesium hydride bed for hydrogen generation and storage – A dynamic simulation study," Applied Energy, Elsevier, vol. 200(C), pages 260-272.
    • Handle: RePEc:eee:appene:v:200:y:2017:i:c:p:260-272
    DOI: 10.1016/j.apenergy.2017.05.089
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    Cited by:

    1. Chen, Bin & Xu, Haoran & Tan, Peng & Zhang, Yuan & Xu, Xiaoming & Cai, Weizi & Chen, Meina & Ni, Meng, 2019. "Thermal modelling of ethanol-fuelled Solid Oxide Fuel Cells," Applied Energy, Elsevier, vol. 237(C), pages 476-486.
    2. Xiao, Gang & Sun, Anwei & Liu, Hongwei & Ni, Meng & Xu, Haoran, 2023. "Thermal management of reversible solid oxide cells in the dynamic mode switching," Applied Energy, Elsevier, vol. 331(C).
    3. Chen, Bin & Hajimolana, Yashar S. & Venkataraman, Vikrant & Ni, Meng & Aravind, P.V., 2019. "Integration of reversible solid oxide cells with methane synthesis (ReSOC-MS) in grid stabilization: A dynamic investigation," Applied Energy, Elsevier, vol. 250(C), pages 558-567.
    4. Giap, Van-Tien & Lee, Young Duk & Kim, Young Sang & Ahn, Kook Young, 2020. "A novel electrical energy storage system based on a reversible solid oxide fuel cell coupled with metal hydrides and waste steam," Applied Energy, Elsevier, vol. 262(C).

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