Abstract
Thermochemical energy storage system (TCES) is a novel generation of concentrated solar power (CSP) heat storage system, which has the characteristics of higher heat storage density and long-term heat storage. Ca(OH)2 is a low-cost and widely available material with great application prospects, especially in CSP system because of the suitable heat storage temperature. This research focuses on improving the heat storage efficiency of Ca(OH)2/CaO TCES system by KNO3 addition. In order to further study the effect of KNO3 addition on Ca(OH)2/CaO heat storage process, the kinetic analysis of the thermal storage process of pure and KNO3 added Ca(OH)2 was carried out and the kinetic control equations were obtained, which can provide guidance for the design of the Ca(OH)2/CaO TCES system. Results show that 10 wt% KNO3 addition can reduce the heat storage temperature to 428.49 °C and greatly accelerate the reaction with nearly no loss of heat storage density. The cycling stability of the pure as well as KNO3 added Ca(OH)2/CaO system was investigated in air and nitrogen atmospheres. The failure process of the KNO3 added Ca(OH)2/CaO in air atmosphere is revealed and it is verified that the composite material has a good cyclic stability in nitrogen atmosphere.
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