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Long-Term Durability and Reactivation of Thermochemical Heat Storage Driven by the CaO/Ca(OH)<sub>2</sub> Reversible Reaction
Nagoya University, Nagoya, Japan
Nagoya University, Nagoya, Japan
Nagoya University, Nagoya, Japan
Nagoya University, Nagoya, Japan
Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
Nagoya University, Nagoya, Japan
- 1 Nagoya University, Nagoya, Japan
- 2 Nagoya University, Nagoya, Japan
- 3 Nagoya University, Nagoya, Japan
- 4 Nagoya University, Nagoya, Japan
- 5 Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
- 6 Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
- 7 Integrated Technology Center, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
- 8 Nagoya University, Nagoya, Japan
Journal of Materials Science and Chemical Engineering·Volume 05 (2017)·Pages 23–32·Published 10 November 2017·DOI10.4236/msce.2017.511003
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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.
KeywordsThermochemical Heat StorageDurabilityRepetitive ReactionReactivationCaO/Ca(OH)<sub>2</sub>Reaction
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