文献类型：期刊文献

英文题名：Thermal stability and microstructure of sodium nitrite in multicomponent molten salts: An experimental analysis

作者：Lin, Qingqing[1,3];Xu, Yanxia[1,3];Yang, Xinmei[1];Song, Weijun[2];Yang, Xiaobo[4];Sun, Ze[1,2,3,4]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[2]Qinghai Univ, Salt Lake Chem Engn Res Complex, Xining 810016, Peoples R China;[3]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[4]Qinghai Minzu Univ, Sch Chem & Chem Engn, Xining 810007, Peoples R China

年份：2024

卷号：283

外文期刊名：SOLAR ENERGY

收录：;EI(收录号：20244317250779);WOS:【SCI-EXPANDED(收录号:WOS:001346782400001)】；

基金：This study was supported by a grant from the Open Project of the Salt Lake Chemical Engineering Research Complex at the Qinghai University (No. 2023-DXSSKF-Z03) . The authors are grateful to the National Nat-ural Science Foundation of Qinghai Province, China (Grant 2022-ZJ-910) ,National Natural Science Foundation of China (51774144) , and National Key Research and Development Program of China (2018YFC1903803) .

语种：英文

外文关键词：Multicomponent molten salts; Nitrite; High temperature; Raman; Thermal stability

摘要：LiNO3 exhibits excellent properties in mixed molten salts but is prohibitively expensive for practical applications. In this study, we explored the feasibility of incorporating NaNO2 as a partial substitute for LiNO3 to reduce costs while maintaining desirable performance in thermal storage systems. Differential scanning calorimetry, thermogravimetric analysis, and Raman spectroscopy were employed to analyze nitrites composed of NaNO3-KNO3 (-LiNO3) with varying NaNO2 contents (0-20 wt%). The effect of NaNO2 content on the thermal stability of mixed molten salts from both macro and micro perspectives was investigated. These results indicate that in the NaNO3-KNO3-NaNO2 ternary molten salt system, increasing the NaNO2 content leads to greater NO3- vibration and enhanced thermal stability. Upon replacing LiNO3 with NaNO2, the NO3- vibration initially decreases and then increases, with the sample containing 7 wt% NaNO2 exhibiting the highest thermal stability differential of 488.11 degrees C. This represents an enhancement of approximately 37 %, thereby surpassing the performance of the pure ternary LiNO3 molten salt system. These findings suggest that the substitution of LiNO3 with NaNO2 possesses significant potential for the design and development of new cost-effective molten salt systems with superior thermal stability.