作　　者： ; ; ; ; ;

机构地区： 中山大学工学院

出　　处： 《太阳能学报》 2009年第12期1621-1626,共6页

摘　　要： 采用静态高温混合熔融法制备以硝酸钾、亚硝酸钠、硝酸钠为三元基元和添加剂构成多元混合熔盐。通过热稳定性、放热实验以及X-射线衍射(XRD)相分析和DSC热分析等表征技术,确定在三元熔盐中加入5%添加剂additive A时,多元混合熔盐比三元熔盐的高温热稳定性好。在不提高熔盐固体析出温度的前提下,可以使其最佳操作温度由原来400～500℃提高到约550℃。从多元混合熔盐中NO_2^-含量变化和相变潜热损失方面可以发现添加剂adttive A的加入可以降低多元熔盐劣化程度,提高混合熔盐的蓄热效率。 Multi-component molten salts composed of potassium nitrate, sodium nitrite, sodium nitrate with 5% additive A were prepared by statically mixed. The experiments results showed that molten salt with 5 % additive A had higher thermal stability and its best operating temperature would be increased to 550℃ from 400-500℃. Thermal stability and thermal cycling analysis showed that molten salt with 5 % additive A had lower freezing point, and the loss of nitrite content and deterioration time of molten salt were also reduced at the same time. XRD and DSC tests also indicated loss of latent heat in molten salts was decreased. Therefore, thermal storage efficiency of molten salts was increased.

关 键 词： 高温熔盐 硝酸熔盐 添加剂 热稳定性

领　　域： [动力工程及工程热物理] [动力工程及工程热物理] [理学] [理学]