Investigation on the Ca(OH)(2)/CaO thermochemical energy storage system with potassium nitrate addition
Investigation on the Ca(OH)(2)/CaO thermochemical energy storage system with potassium nitrate addition
复制标题
添加硝酸钾的Ca(OH)(2)/CaO热化学储能系统研究
DOI：
10.1016/j.solmat.2020.110646
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发表时间：
2020
影响因子：
6.9
通讯作者：
Yan J.
中科院分区：
文献类型：
--
作者：
Wang T.;Zhao C. Y.;Yan J.
热化学储能系统（TCES）是新一代聚光太阳能（CSP）储热系统，具有储热密度较高、储热时间长等特点。 Ca(OH)2是一种成本低廉、用途广泛的材料，具有广阔的应用前景，特别是在CSP系统中，由于其适宜的蓄热温度。本研究的重点是通过添加KNO3来提高Ca(OH)2/CaO TCES系统的蓄热效率。为了进一步研究KNO3添加对Ca(OH)2/CaO蓄热过程的影响，对纯Ca(OH)2和添加KNO3的Ca(OH)2蓄热过程进行了动力学分析，得到了动力学控制方程，为Ca(OH)2/CaO TCES系统的设计提供指导。结果表明，添加 10 wt% KNO3 可以将蓄热温度降低至 428.49 °C，大大加速反应，而蓄热密度几乎没有损失。研究了纯 Ca(OH)2/CaO 体系和添加 KNO3 的 Ca(OH)2/CaO 体系在空气和氮气气氛中的循环稳定性。揭示了KNO3添加Ca(OH)2/CaO在空气气氛中的失效过程，验证了该复合材料在氮气气氛中具有良好的循环稳定性。
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)2is 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 KNO3addition. In order to further study the effect of KNO3addition on Ca(OH)2/CaO heat storage process, the kinetic analysis of the thermal storage process of pure and KNO3added Ca(OH)2was 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% KNO3addition 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 KNO3added Ca(OH)2/CaO system was investigated in air and nitrogen atmospheres. The failure process of the KNO3added 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.