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Dehydration/hydration of MgO/H2O chemical thermal storage system

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  • Pan, Zhihao
  • Zhao, C.Y.

Abstract

Thermal energy storage systems improve the inefficiency of industrial processes and renewable energy systems (supply versus demand). Chemical reaction is a promising way to store thermal energy because of its high energy storage density, long-term energy storage, etc. This study investigated an MgO/H2O chemical thermal storage system that stores thermal energy by decomposing Mg(OH)2 (endothermic reaction), and supplies thermal energy by combining water vapor with MgO (exothermic reaction). Heat supply is greatly influenced by MgO properties, particularly dehydration temperature. Therefore, the equilibrium hydration fractions of MgO prepared at various dehydration temperatures were measured. Then, the relation between dehydration temperature and the equilibrium hydration fractions of MgO was determined. The equilibrium hydration fractions of MgO at various hydration temperatures and pressures were also measured. The chemical thermal storage system was inefficient at dehydration temperatures lower than 350 °C or higher than 500 °C. The efficiency of this system can be improved by increasing the hydration temperature while keeping the relative vapor pressure unchanged.

Suggested Citation

  • Pan, Zhihao & Zhao, C.Y., 2015. "Dehydration/hydration of MgO/H2O chemical thermal storage system," Energy, Elsevier, vol. 82(C), pages 611-618.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:611-618
    DOI: 10.1016/j.energy.2015.01.070
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    Cited by:

    1. Pan, Z.H. & Zhao, C.Y., 2017. "Gas–solid thermochemical heat storage reactors for high-temperature applications," Energy, Elsevier, vol. 130(C), pages 155-173.
    2. Xia, B.Q. & Zhao, C.Y. & Yan, J. & Khosa, A.A., 2020. "Development of granular thermochemical heat storage composite based on calcium oxide," Renewable Energy, Elsevier, vol. 147(P1), pages 969-978.
    3. Yan, J. & Zhao, C.Y. & Pan, Z.H., 2017. "The effect of CO2 on Ca(OH)2 and Mg(OH)2 thermochemical heat storage systems," Energy, Elsevier, vol. 124(C), pages 114-123.
    4. Yan, J. & Pan, Z.H. & Zhao, C.Y., 2020. "Experimental study of MgO/Mg(OH)2 thermochemical heat storage with direct heat transfer mode," Applied Energy, Elsevier, vol. 275(C).
    5. Chen, Xiaoyi & Jin, Xiaogang & Liu, Zhimin & Ling, Xiang & Wang, Yan, 2018. "Experimental investigation on the CaO/CaCO3 thermochemical energy storage with SiO2 doping," Energy, Elsevier, vol. 155(C), pages 128-138.
    6. Flegkas, S. & Birkelbach, F. & Winter, F. & Freiberger, N. & Werner, A., 2018. "Fluidized bed reactors for solid-gas thermochemical energy storage concepts - Modelling and process limitations," Energy, Elsevier, vol. 143(C), pages 615-623.
    7. Khosa, Azhar Abbas & Yan, J. & Zhao, C.Y., 2021. "Investigating the effects of ZnO dopant on the thermodynamic and kinetic properties of CaCO3/CaO TCES system," Energy, Elsevier, vol. 215(PA).
    8. Xu, Y.X. & Yan, J. & Zhao, C.Y., 2022. "Investigation on application temperature zone and exergy loss regulation based on MgCO3/MgO thermochemical heat storage and release process," Energy, Elsevier, vol. 239(PC).
    9. Yan, J. & Zhao, C.Y., 2016. "Experimental study of CaO/Ca(OH)2 in a fixed-bed reactor for thermochemical heat storage," Applied Energy, Elsevier, vol. 175(C), pages 277-284.

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