三元熔盐体系LiCl-NaCl-KCl的相图预测及热力学研究
Prediction of Phase Diagram and Thermodynamic Properties of Ternary Molten Salt System LiCl-NaCl-KCl
DOI: 10.12677/ms.2025.156141, PDF,    科研立项经费支持
作者: 徐子豪, 徐 芳, 王军涛*：湖北科技学院核技术与化学生物学院，湖北 咸宁；程继方：谷波技术(常州)有限公司，江苏 常州
关键词: 光热发电；相图预测；Kohler模型；氯化盐；蓄热；Concentrating Solar Power； Phase Diagram Prediction； Kohler Model； Chloride Salt； Thermal Storage
摘要: 采用Kohler模型预测了LiCl-NaCl-KCl三元体系的相图，获得了一个三元共结晶点，其熔点为343.0℃，摩尔分数组成为：x(LiCl) = 0.5543，x(NaCl) = 0.0886，x(KCl) = 0.3571。根据其组成制备了混合熔盐样品，进行了差式扫描量热法(DSC)熔点测试、热重(TG)动态热稳定测试、高温长时间静态热稳定性测试和高温密度测试。DSC测试结果显示熔点为347.9℃，相变焓为86.2 J/g；热稳定性实验结果表明其热稳定温度为700℃；高温密度测试表明共晶点熔盐在450℃~700℃之间的液态密度为1.98~2.07 g/cm3。该熔盐共晶混合物拥有适中的熔点，较高的热稳定温度，适合用作熔盐电解质，也能用作工业余热回收，以及用于太阳能光热发电的蓄热材料。
Abstract: The phase diagram of the LiCl-NaCl-KCl ternary system was predicted using the Kohler model. The predicted results show that there exists one ternary eutectic point with a melting point of 343.0˚C and a molar fraction composition of x(LiCl) = 0.5543, x(NaCl) = 0.0886, and x(KCl) = 0.3571, respectively. Then, differential scanning calorimetry (DSC) experiment, thermogravimetric (TG) test, Static thermal stability test under high temperature for a long time and molten salt density test were carried out. The DSC results show that the melting point of the predicted mixed molten salt is 347.9˚C, and the corresponding latent heat of phase transition is 86.2 J/g. TG and long-term static thermal stability experiments show that the thermal stability temperature of the predicted eutectic mixed salt is 700˚C. And the liquid density test of molten salt is 1.98~2.07 g/cm3 with the temperature range 450˚C ~700˚C. This molten salt eutectic mixture has a moderate melting point and a relatively high thermal stability temperature. It is suitable for use as a molten salt electrolyte and can also be used as a heat storage material for industrial waste heat recovery and solar thermal power generation.
文章引用：徐子豪, 徐芳, 程继方, 王军涛. 三元熔盐体系LiCl-NaCl-KCl的相图预测及热力学研究[J]. 材料科学, 2025, 15(6): 1331-1339. https://doi.org/10.12677/ms.2025.156141

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