储能科学与技术 ›› 2021, Vol. 10 ›› Issue (4): 1292-1296.doi: 10.19799/j.cnki.2095-4239.2021.0126

• 储能材料与器件 • 上一篇    下一篇

三元混合碳酸熔盐热物性实验研究

吴玉庭(), 明苏布道, 张灿灿(), 鹿院卫   

  1. 北京工业大学环境与生命学部，传热强化与过程节能教育部重点实验室及传热与能源利用 北京市重点实验室，北京 100124
  • 收稿日期:2021-03-16 修回日期:2021-03-24 出版日期:2021-07-05 发布日期:2021-06-25
  • 通讯作者: 张灿灿 E-mail:wuyuting@bjut.edu.cn;zcc@bjut.edu.cn
  • 作者简介:吴玉庭（1970—），男，博士生导师，主要研究方向为高温高热流传热蓄热、低品位能源高效热功转换，先进制冷技术，E-mail：wuyuting@bjut.edu.cn。
  • 基金资助:
    国家重点研发计划(2017YFB0903603);国家自然科学基金(51906003)

Experimental research of the thermophysical properties of ternary mixed carbonate molten salts

Yuting WU(), Subudao MING, Cancan ZHANG(), Yuanwei LU   

  1. MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
  • Received:2021-03-16 Revised:2021-03-24 Online:2021-07-05 Published:2021-06-25
  • Contact: Cancan ZHANG E-mail:wuyuting@bjut.edu.cn;zcc@bjut.edu.cn

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摘要：

为满足超临界二氧化碳太阳能光热发电系统高温传热储热的要求，对3种不同比例的高温混合碳酸熔盐的热物性进行研究。实验结果表明，1号、2号、3号混合碳酸熔盐的熔点分别为388.7、337.9、391.3 ℃；初晶点分别为454.9、639.7、535.4 ℃；1号、3号混合碳酸熔盐的分解温度分别为916.2、920.4 ℃。通过分析发现2号混合碳酸熔盐的初晶点较高和熔化潜热较小，因此选取1号和3号混合碳酸熔盐进行比热容、导热系数和黏度的测定。通过分析发现，在实验温度范围内1号和3号混合碳酸熔盐的比热容随着温度的升高先降低再升高；1号混合碳酸熔盐的平均导热系数为1.024 W/(m·K)，是3号混合碳酸熔盐平均导热系数的2.29倍；1号和3号混合碳酸熔盐的黏度都随着温度升高逐渐降低，1号和3号混合碳酸熔盐的最小黏度值分别为6.62 mPa·s和5.28 mPa·s。

关键词: 太阳能, 碳酸熔盐, 储热, 热物性

Abstract:

The thermophysical properties of three different proportions of high-temperature mixed carbonate molten salts were studied to meet the requirements of high-temperature heat transfer and storage in a supercritical carbon dioxide solar thermal power generation system. The results show that the melting points of the mixed carbonate molten salts are 388.7 ℃, 337.9 ℃, and 391.3 ℃; initial crystallization points occur at 454.9 ℃, 639.7 ℃, and 535.4 ℃; and decomposition temperatures of the first and third salts are 916.2 ℃ and 920.4 ℃, respectively. The initial crystallization point of the second mixed carbonate molten salt is high, and its melting latent heat is small. Therefore, the first and third mixed carbonate molten salts are selected to measure specific heat, thermal conductivity, and viscosity. It is found that the specific heat of the first and third salts initially decrease and then increase with increasing temperature within the experimental range. The average thermal conductivity of the first mixed carbonate molten salt is 1.024 W·(m·K)-1, which is 2.29 times of that of the third salt; the viscosity of these salts gradually decreases with increasing temperature. The minimum viscosity values of the first and third mixed carbonate molten salts are 6.62 and 5.28 mPa·s, respectively.

Key words: solar energy, carbonate molten salt, thermal energy storage, thermophysical properties

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