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Particle-scale study of coupled physicochemical processes in Ca(OH)2 dehydration using the lattice Boltzmann method

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  • Luo, Ji-Wang
  • Chen, Li
  • Wang, MengYi
  • Xia, Yang
  • Tao, WenQuan

Abstract

Fundamental understanding of coupled physicochemical processes is crucial for improving the heat storage/release performance of thermochemical heat storage systems. In this study, for the first time a coupled lattice Boltzmann model is developed to simulate the particle-scale physicochemical processes during Ca(OH)2 dehydration, including fluid flow, heat transfer, vapor mass transport and chemical reaction. The dehydration processes of a single Ca(OH)2 particle, a single particle with coated ceramic shell and packed particles are studied, and thorough parametric studies are performed. The results show that the dehydration reaction rate of a single particle is mainly determined by the temperature and Ca(OH)2 concentration. Introducing more micro-pores or meso-pores into the particle is favorable to achieve quicker heat storage, but at the cost of lower energy density. Increasing the Reynolds number from 0.3 to 3 or increasing the inlet temperature by 50 K can shorten the reaction time tc by at least 33.8%. Dedicate design of the shell coated on the particle can enhance the dehydration process with tc decreased by 3.5%. The underlying heterogenous structures greatly affect the reaction rate of packed particles, and local cracks should be prevented to achieve fast and stable heat storage response.

Suggested Citation

  • Luo, Ji-Wang & Chen, Li & Wang, MengYi & Xia, Yang & Tao, WenQuan, 2022. "Particle-scale study of coupled physicochemical processes in Ca(OH)2 dehydration using the lattice Boltzmann method," Energy, Elsevier, vol. 250(C).
  • Handle: RePEc:eee:energy:v:250:y:2022:i:c:s0360544222007381
    DOI: 10.1016/j.energy.2022.123835
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    References listed on IDEAS

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    1. Schmidt, Matthias & Linder, Marc, 2017. "Power generation based on the Ca(OH)2/ CaO thermochemical storage system – Experimental investigation of discharge operation modes in lab scale and corresponding conceptual process design," Applied Energy, Elsevier, vol. 203(C), pages 594-607.
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