Development on Thermochemical Energy Storage Based on CaO-Based Materials: A Review

Yi Yuan, Yingjie Li and Jianli Zhao
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Yi Yuan: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Yingjie Li: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Jianli Zhao: School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Sustainability, 2018, vol. 10, issue 8, 1-24

Abstract: The intermittent and inconsistent nature of some renewable energy, such as solar and wind, means the corresponding plants are unable to operate continuously. Thermochemical energy storage (TES) is an essential way to solve this problem. Due to the advantages of cheap price, high energy density, and ease to scaling, CaO-based material is thought as one of the most promising storage mediums for TES. In this paper, TES based on various cycles, such as CaO/CaCO 3 cycles, CaO/Ca(OH) 2 cycles, and coupling of CaO/Ca(OH) 2 and CaO/CaCO 3 cycles, were reviewed. The energy storage performances of CaO-based materials, as well as the modification approaches to improve their performance, were critically reviewed. The natural CaO-based materials for CaO/Ca(OH) 2 TES experienced the multiple hydration/dehydration cycles tend to suffer from severe sintering which leads to the low activity and structural stability. It is found that higher dehydration temperature, lower initial sample temperature of the hydration reaction, higher vapor pressure in the hydration reactor, and the use of circulating fluidized bed (CFB) reactors all can improve the energy storage performance of CaO-based materials. In addition, the energy storage performance of CaO-based materials for CaO/Ca(OH) 2 TES can be effectively improved by the various modification methods. The additions of Al 2 O 3 , Na 2 Si 3 O 7 , and nanoparticles of nano-SiO 2 can improve the structural stabilities of CaO-based materials, while the addition of LiOH can improve the reactivities of CaO-based materials. This paper is devoted to a critical review on the development on thermochemical energy storage based on CaO-based materials in the recent years.

Keywords: thermochemical energy storage; CaO/Ca(OH) 2; CaO/CaCO 3; modification; hydration/dehydration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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