Numerical study and enhancement of Ca(OH)2/CaO dehydration process with porous channels embedded in reactors

Mengyi Wang, Li Chen, Pu He and Wen-Quan Tao

Energy, 2019, vol. 181, issue C, 417-428

Abstract: Thermochemical energy storage has drawn great attention due to its advantages such as high energy density, little heat loss, and long term and distance storage. The present study aims to enhance reactive transport processes during the dehydration process of Ca(OH)2/CaO. A physicochemical model is developed for the dehydration process occurring in porous reactant, including vapor flow, heat transfer and endothermic chemical reaction. Distributions of temperature and Ca(OH)2 concentration in cylinder reactors are discussed, and complicated coupling mechanisms are revealed between multiple processes. In addition, the results show that increasing temperature can efficiently enhance the reactive transport. Effects of reactant porosity are also explored and different reaction patterns are observed. Finally, porous channels with high thermal conductivity and permeability are embedded into the reactor. On the one hand, the porous channel with high permeability serves as highway for the vapor generated to be discharged out of the reactor, thus pushing the reaction towards dehydration direction. On the other hand, the porous channel with high thermal conductivity also enhances local heat transfer, thus accelerating the dehydration chemical reaction. In summary, with porous channels added, the dehydration process is greatly enhanced.

Keywords: Thermochemical energy storage; Dehydration; Porous channel; Enhanced reactive transport; Numerical simulation (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (12)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:181:y:2019:i:c:p:417-428

DOI: 10.1016/j.energy.2019.05.184

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