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NaCl-MgCl2-CaCl2相图计算方法研究

Li Yuanyuan, Zhang Xiang, Miao Zhichang

wf(2022)

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Abstract
为满足规模化太阳能热发电中对传热蓄热的要求,针对储能材料开展探究。以熔融盐热物性及经济性作为筛选条件,选定来源广泛、价格低廉、工作温度范围宽、黏度低、相变潜热大的NaCl、MgCl2和CaCl2三元熔盐体系开展深入研究。应用修正的准化学溶液模型,在子二元系基础上推导计算三元混合熔盐NaCl-MgCl2-CaCl2相图。结果表明,该熔盐混合物共晶点温度为412.45℃,NaCl、MgCl2和CaCl2的摩尔分数分别为50.99%、22.78%和26.23%,与已有文献数据相比,误差在3%以内,验证了方法的准确性,为构建熔盐氯化物相图数据库奠定了部分基础。
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Key words
solar thermal power generation,molten salt phase equilibrium,ternary phase diagram,modified quasi-chemical solution model
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