化工进展2024，Vol.43Issue(4)：1764-1773,10.DOI:10.16085/j.issn.1000-6613.2023-0648
钙镁二元盐复合材料的储热性能
Evaluation of the thermal energy storage performance of calcium-magnesium binary composite salt hydrates
摘要
Abstract
Salt hydrate as a type of thermochemical energy storage materials involves reversible chemical reactions for the storage and release of heat during the processes of adsorption and desorption.It has high thermal energy storage density and is suitable for long-term thermal energy storage.Moreover,it can be combined with solar energy utilization,which can reduce the dependence on fossil energy.In this study,effect of different porous matrix,microporous molecular sieve(13X)and mesoporous diatomaceous earth(WSS)on the thermal energy storage performance of calcium-magnesium binary composite salt hydrates was investigated based on MgCl2 and CaCl2 with a molar ratio of 1:2.Firstly,the pore structure,sorption isotherm and cycle stability of the developed two types of calcium-magnesium binary composite salt hydrates were compared.A two-dimensional model of a honeycomb thermal energy storage unit was used to analyze the storage/release performances of the developed two composites.Results showed that the 13X had smaller pore volume,larger specific surface area than WSS.Due to the impregnation of MgCl2/2CaCl2,the pore volume,specific surface area and porosity of calcium-magnesium binary composite salt hydrates had been reduced compared to those of corresponding porous matrix.Both MgCl2/2CaCl2 composites showed higher sorption capacity than that of the porous matrix.Moreover,the Polanyi adsorption potential theory could describe the sorption isotherm of the calcium-magnesium binary composite salt hydrates well.Furthermore,the simulation results showed that the thermal energy storage density of the WSS20 was 371.94MJ/m3,which was higher than that of 13X17,as well as the energy released power and recovery efficiency.The WSS20 could be used for storing/releasing thermal energy more than 47 times,while the 13X17 showed bad stability even within 10 cycles.Therefore,considering both thermal energy storage density and cycle stability,WSS20 was more suitable for storing thermal energy.关键词
热化学储热/钙镁二元盐/硅藻土/循环稳定性/储热密度Key words
thermochemical energy storage/calcium-magnesium binary salt/wakkanai siliceous shale/cyclic stability/thermal energy storage density分类
能源科技引用本文复制引用
刘涵,曲明璐,叶振东,杨帆,黄蓓佳,张亚宁,刘洪芝..钙镁二元盐复合材料的储热性能[J].化工进展,2024,43(4):1764-1773,10.基金项目
国家自然科学基金青年基金(51906157) （51906157）
国家自然科学基金面上项目(71974129). （71974129）
