文献类型：期刊文献

英文题名：Influences of impurity Cl- on the thermal performance of solar salt for thermal energy storage

作者：Sun, Ze[1,2];Su, Lei[1];Gao, Xianyang[1];Lu, Guimin[1];Song, Xingfu[1];Yu, Jianguo[1]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Resources Proc Engn, Minist Educ, Shanghai 200237, Peoples R China;[2]Qinghai Nationalities Univ, Sch Chem & Chem Engn, Xining 810007, Peoples R China

年份：2021

卷号：216

起止页码：90

外文期刊名：SOLAR ENERGY

收录：;EI(收录号：20210509841099);WOS:【SCI-EXPANDED(收录号:WOS:000621448400002)】；

基金：The authors are grateful to the National Key R&D Program of China (Grant 2018YFC1903803), National Natural Science Foundation of China (Grant 51774144 and U1407126), Applied basic research of Qinghai Province (Grant 2017-ZJ-727), Capacity Building of Qinghai Engineering Research Center for Integrated Utilization of Salt Lake (Grant 2015-GX-Q19 A), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Solar Salt; Impurity; Thermophysical properties

摘要：Molten nitrate salts are widely used as heat transfer and energy storage medium in Concentrated Solar Power (CSP) systems. Solar Salt (60 wt% NaNO3-40 wt% KNO3) is the commercial binary molten nitrate salt, which is the preferred energy storage material with high density, high specific heat, low melting point, high thermal stability, and low vapor pressure. This paper explored the effects of impurity Cl- on the thermophysical properties of Solar Salt, including liquidus temperature, density, viscosity, and thermal stability. The results showed that Cl- can significantly reduce the liquidus temperature, and when Cl- was less than 0.5 wt%, the liquidus temperature of molten salt system decreased within 1 degrees C. On the other hand, Cl- had little effect on the density, viscosity and thermal stability of the mixed molten salt system at 400 degrees C, but at high temperature Cl- will promote the volatilization of components. By analyzing the thermostatic stability at 565 degrees C, it was found that the total mass loss changes less than 0.3% when Cl- was less than 0.01 wt%. After comprehensive analysis, the conclusion is that the upper limit of Cl- is preferably less than 0.1 wt% for keeping good thermal performances of Solar Salt.