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

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

Energy, 2022, vol. 250, issue C

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.

Keywords: Thermochemical energy storage; Calcium hydroxide dehydration; Coupled physicochemical processes; Lattice Boltzmann method; Particle scale (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:250:y:2022:i:c:s0360544222007381

DOI: 10.1016/j.energy.2022.123835

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