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Research on the effect of adding NaCl on the performance of KNO3–NaNO3 binary molten salt

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Abstract

The static melting method is used to prepare KNO3–NaNO3–NaCl ternary mixed molten salt containing 5–20 mass% NaCl, and the thermal physical parameters such as specific heat capacity, melting point, and latent heat of phase change are measured by differential scanning calorimetry. The microstructures of the mixed molten salts are characterized by XRD and SEM. The experimental results show that compared with the base salt, after adding different mass fractions of NaCl, the melting point of the molten salts was reduced by about 24.8%, and the latent heat of phase change was increased by 22.71–52.53 J g−1, the solid and liquid state specific heat capacity of molten salts increased by 3.4% and 2.3% after the addition of 10 mass% NaCl. The addition of 15 mass% NaCl formed a special chlorine salt layer on the surface of the molten salt. This structure reduced the intermolecular voids and enhanced the intermolecular force, which may be the reason for the increase in specific heat capacity and latent heat of phase change.

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Acknowledgements

This research is supported by the Science and Technology Commission of Shanghai Municipality under the contract No. 20dz1205208, which is gratefully acknowledged by the authors.

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Authors and Affiliations

  1. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, No.2588 Changyang Road, Yangpu District, Shanghai, 200090, China

    Y. Li, W. W. Tan & Q. Z. Zhu

  2. Hebei Xibaipo Power Generation Co., Ltd., Shijiazhuang, 050400, China

    C. G. Wang

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  1. Y. Li
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  2. W. W. Tan
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  4. Q. Z. Zhu
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Contributions

Y. Li prepared the samples and the manuscript. W.W. Tan and C.G. Wang contributed to the analysis and manuscript preparation. Q.Z. Zhu helped with the analysis through constructive discussions.

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Correspondence to Y. Li or Q. Z. Zhu.

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We declare that there are no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Authors: Y. Li, W.W. Tan, C.G. Wang, Q.Z. Zhu.

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Li, Y., Tan, W.W., Wang, C.G. et al. Research on the effect of adding NaCl on the performance of KNO3–NaNO3 binary molten salt. J Therm Anal Calorim 148, 733–739 (2023). https://doi.org/10.1007/s10973-022-11791-w

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  • DOI: https://doi.org/10.1007/s10973-022-11791-w

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