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Evaluating and enhancing heat storage in a Ca(OH)2/CaO shell-tube reactor: A numerical study on key factors and performance optimization

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  • Chen, Jianing
  • Yang, Xueming
  • Su, Hui
  • Cui, Jie
  • Xie, Jianfei

Abstract

Thermochemical energy storage offers a promising solution to addressing the challenges such as the discontinuous operation of concentrating solar power plants. This study develops a comprehensive model to simulate the Ca(OH)2 heat storage process within a shell-tube reactor system by integrating the fluid dynamics, chemical reactions and thermal processes. The influence of operating conditions and geometric characteristics on the reactor's performance is systematically analyzed. Key performance evaluations are evaluated using an orthogonal experimental design. The results reveal that the reactor's reaction time is 11,305 s under baseline conditions. Increasing the HTF temperature from 825 K to 875 K can reduce the reaction time by 47.9 %, while decreasing the reactant porosity from 0.8 to 0.6 leads to an increase of 100 % in energy storage capacity and extends the heat storage duration by 183 %. Additionally, optimizing the tube arrangement by adding 22 tube passes can increase the energy storage efficiency except causing a marginal increase in reaction time. Among the factors analyzed, reactant porosity has the most significant impact on the heat storage time, while the HTF temperature determinates the heat exchange rate and energy storage efficiency.

Suggested Citation

  • Chen, Jianing & Yang, Xueming & Su, Hui & Cui, Jie & Xie, Jianfei, 2024. "Evaluating and enhancing heat storage in a Ca(OH)2/CaO shell-tube reactor: A numerical study on key factors and performance optimization," Energy, Elsevier, vol. 309(C).
    • Handle: RePEc:eee:energy:v:309:y:2024:i:c:s0360544224029360
    DOI: 10.1016/j.energy.2024.133161
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