Thermal performance of a binary carbonate molten eutectic salt for high-temperature energy storage applications

• Published in: Applied energy Vol. 262; p. 114418
• Main Authors: Pan, Gechuanqi, Wei, Xiaolan, Yu, Chao, Lu, Yutong, Li, Jiang, Ding, Jing, Wang, Weilong, Yan, Jinyue
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.03.2020
• Subjects: Binary mixtures; Carbonates; Carbonation; Concentrating solar power; Diffusion in liquids; Digital storage; Energy storage; Energy storage applications; Eutectics; Fluid Power; Heat storage; Heat transfer; High temperature applications; Linear temperature dependence; Microstructure; Microstructures; Molecular dynamics; Molten carbonate; Molten carbonate salts; Molten carbonates; Molten materials; Operating temperature ranges; Salts; Self-diffusion coefficients; Sodium Carbonate; Sodium compounds; Solar energy; Solar thermal power plants; Specific heat; Storage (materials); Systems analysis; Temperature distribution; Thermal conductivity; Thermodynamic properties; Thermoelectric power plants; Thermophysical properties; Microstructures; Molten carbonates; Concentrating solar power; Thermophysical properties; Energy storage
• ISSN: 0306-2619; 1872-9118; 1872-9118
• DOI: 10.1016/j.apenergy.2019.114418

[Display omitted] •Molecular simulation is used to compute structures-properties of Na2CO3-K2CO3.•Temperature and component dependence are studied from microscopic view.•The temperature-thermophysical properties-composition correlation are obtained. Molten carbonate eutectic salts are promising thermal storage and heat transfer fluid materials in solar thermal power plant with the feature of large specific heat capacity, wide operating temperature range and little corrosive. The high-temperature properties of molten carbonates should be determined accurately over the entire operating temperature for energy system design. In this paper, molecular dynamic simulation is used to study temperature and component dependence of microstructures and thermophysical properties of the binary carbonate molten salt. Negative linear temperature dependence of densities and thermal conductivities of binary mixtures of different components is confirmed with respect to the distances of ion clusters. Besides, positive linear temperature dependence of self-diffusion coefficient is also obtained. When temperature is constant, densities and thermal conductivities of binary mixtures are linearly related with components. Self-diffusion coefficients of CO32− firstly increase and then decrease with increasing mole fraction of Na2CO3. The temperature-thermophysical properties-composition correlation formulas are obtained, and the database of thermophysical properties of molten carbonate salts over the entire operating temperature is complemented, which will provide the essential data for heat transfer and storage system design, operation, and optimization in CSP.