Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)2 Reversible Reaction

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DOI: 10.4236/msce.2017.511003    816 Downloads   1,582 Views  Citations

ABSTRACT

Thermochemical heat storage is a promising technology for improving thermal energy efficiency. To investigate the durability of the CaO/Ca(OH)2 reaction and develop a reactivation method, repetitive charging/discharging operation of a packed bed reactor with a thick packed bed was conducted, and variations in the discharging behavior, final conversion, and reactant activity were investigated. Owing to the formation of a deactivated sintered reactant block, the discharging time halved and the final conversion ratio decreased by the 53rd discharging operation. To enhance durability, a reactivation method using high-pressure vapor was implemented during the 54th discharging operation. Following reactivation, the final conversion increased 15%, and the discharging time tripled when compared with the discharging operation before reactivation, confirming the success of this simple reactivation method.

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Kuwata, K. , Esaki, T. , Iwase, D. , Ito, H. , Li, S. , Yang, X. , Huang, H. and Kobayashi, N. (2017) Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)2 Reversible Reaction. Journal of Materials Science and Chemical Engineering, 5, 23-32. doi: 10.4236/msce.2017.511003.

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