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Numerical Simulation of the Ca(OH) 2 /CaO Thermochemical Heat Storage Process in an Internal Heating Fixed-Bed Reactor

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  • Jun Yan

    (Institute of Engineering Thermophysics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Lei Jiang

    (Institute of Engineering Thermophysics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

  • Changying Zhao

    (Institute of Engineering Thermophysics, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China)

Abstract

Using a Ca(OH) 2 /CaO thermochemical heat storage system is an effective way to promote the utilization of renewable energy. However, poor thermal conductivity restricts the application of a widely used fixed-bed reactor. To improve the heat storage rate, the internal heating mode, which heats the reactant via the internal heating tube instead of the external wall, was adopted, and the heat storage process in the fixed-bed reactor was investigated numerically. The results show that the number and location of tubes have a significant impact on heat storage performance. Compared with the external wall heating mode, the optimized scheme of six internal heating tubes can shorten the reaction time by 21.78%. The temperature and reaction extent distribution reveal that as the reaction proceeds, the optimized scheme has a higher temperature and reaction extent. Additionally, the effects of different conditions, such as solid particle porosity, wall temperature, outlet pressure, and solid particle size, were also analyzed. The study demonstrates that increases in solid particle porosity, wall temperature, and solid particle size as well as a decrease in outlet pressure can improve the heat storage rate.

Suggested Citation

  • Jun Yan & Lei Jiang & Changying Zhao, 2023. "Numerical Simulation of the Ca(OH) 2 /CaO Thermochemical Heat Storage Process in an Internal Heating Fixed-Bed Reactor," Sustainability, MDPI, vol. 15(9), pages 1-14, April.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7141-:d:1131950
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    References listed on IDEAS

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    Cited by:

    1. Tian, X.K. & Guo, S.J. & Jiang, L. & Lin, S.C. & Yan, J. & Zhao, C.Y., 2024. "Integrated operation and efficiency analysis of CaCO3/CaO in a fixed-bed reactor for thermochemical energy storage," Energy, Elsevier, vol. 294(C).

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