熔融氯化盐传蓄热性能的研究

Study on Heat Transfer and Storage Performance of Molten Chloride

以氯化盐为研究对象,通过添加SiO2及SiC固体颗粒,制备了NaCl-KCl-SiO2及NaCl-KCl-SiC复合熔盐,采用综合热分析仪(TG-DSC)、X射线衍射仪(XRD)、重量法等对复合熔盐的热物性、热稳定性、热腐蚀进行研究。实验结果表明:混合熔盐体系的熔点较低,最高使用温度可达717℃,熔盐热稳定性能良好,10%SiO2复合熔盐的使用温度区间为412~715℃,可长时间(10 h)稳定使用于683℃,宽于传统的NaCl-KCl体系,而且熔点更低。

NaCl-KCl-SiO2 and NaCl-KCl-SiC composite molten salt were prepared by adding SiO2 and SiC solid particles.The thermal properties,thermal stability and thermal corrosion of the composite molten salts were studied by TG-DSC thermal analyzer,XRD and gravimetric method.The experimental results show that the mixed molten salt exhibits lower melting point and excellent thermal stability,the maximum service temperature can reach 717℃.The 10%SiO2 composite molten salt has a temperature range of 412-715℃and it can be used at 683℃for time of 10 h.It is wider than the traditional NaCl-KCl system and has lower melting point.