三元碳酸盐混合物的制备及热物性研究

Research on preparation and thermal property of high temperature carbonate molten salt

选取Na_2CO_3、Li_2CO_3和K_2CO_3按不同比例配制三元混合碳酸盐。通过差示扫描量热分析仪实验测试其热物性。结果表明:能够共熔的碳酸盐混合物的熔点在400℃左右,低于单一组分的熔点;部分样品初晶点高于熔点;熔点低、初晶点小于熔点的碳酸盐混合物熔化潜热大部分在100J/g以上,有些大于200J/g;优选出的9种低熔点、低初晶点和高熔化潜热的碳酸盐混合物的稳定性较好。旨在寻找熔点低、相变潜热大、性能稳定的混合熔盐,为其在太阳能热发电中的应用提供参考和依据。

Selected Na2CO3,Li2CO3 and K2CO3 to prepare ternary mixed carbonates in different proportions.The thermal properties were tested by differential thermal analyzer.The results showed that the melting point of carbonates which melted together was about 400℃.And the melting point of ternary carbonates was lower than the single component＇s.The initial crystallization points of some samples were higher than the melting points.The latent heat of most carbonate mixtures were more than 100J/g,and some were more than 200J/g.These carbonate mixtures had low melting points and the initial points were lower than the melting points.9kinds of carbonate mixtures with low melting points,low initial crystallization points and high melt latent heat were selected.And the stabilities of 9kinds of carbonate mixtures were good.It was attempted to find the mixed molten salts with low melting point,high latent heat and stable performance.The reference and basis for its application in solar thermal power generation were provided.