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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

COST REDUCTION AND PERFORMANCE IMPROVEMENT OF LOW MELTING POINT MOLTEN SALTS FOR HIGH TEMPERATURE HEAT TRANSFER AND STORAGE

Yuting Wu
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology, Beijing 100124,China; Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology, Beijing 100124,China

Chong-Fang Ma
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology, Beijing 100124,China; Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology, Beijing 100124,China

Xia Chen
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology, Beijing 100124,China; Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology, Beijing 100124,China

Yuanwei Lu
MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology, Beijing 100124,China; Beijing Key Laboratory of Heat Transfer and Energy Conversion,Beijing University of Technology, Beijing 100124,China

Abstract

19 kinds of binary mixed molten salts with different ratio have been prepared and a low melting point binary molten salt was obtained, the melting point and decomposition point of which are 117°C and 561°C respectively, and the melting point is much lower compared with the current commonly used Salt Solar and Hitec salt. Thermal physical tests and X-ray diffraction (XRD) tests of sampling at different stages under 500 °C constant temperature for 1200 hours were carried out, the results show that the variation rate of the thermal physical properties of the mixed molten salt before and after the experiment is within ±10%; there is no metamorphism after 1200h high-constant temperature test. Based on the original preparation of the low melting point quaternary nitrates (KNO3-NaNO3-LiNO3-Ca(NO3)2.4H2O), 16 formulations were prepared by replacing lithium nitrate by low cost additive., a low cost and low melting point quaternary salts was obtained, and its specific heat and latent heat of fusion were tested. Results show that its melting point and decomposition point is 90.4°C and 688°C respectively. Compared with Solar salt, low melting point salt (K:Na:Ca:Li NO3) increases thermal storage density by 58%, but increase thermal storage cost by 15%. low melting point salt (K:Na:CaNO3:additive) increases thermal storage density by 98%, and reduce thermal storage cost by 51%. Binary low melting point salts increases thermal storage density by 19%, and reduce thermal storage cost by 22%.

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