Thermal Stability Calculation and Experimental Investigation of Common Binary Chloride Molten Salts Applied in Concentrating Solar Power Plants

Jingyu Zhong, Jing Ding, Jianfeng Lu, Xiaolan Wei and Weilong Wang
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Jingyu Zhong: School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Jing Ding: School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Jianfeng Lu: School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
Xiaolan Wei: School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
Weilong Wang: School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China

Energies, 2022, vol. 15, issue 7, 1-31

Abstract: A computational study on thermal stability was conducted the first time, combining the modified quasi-chemical model, the Antoine equation, and the adiabatic flash evaporation calculation principle to design a method to calculate the system pressure-temperature (P-T) phase diagram of binary chloride molten salts. The evaporation temperature of the molten salt obtained by analyzing the P-T phase diagram of the eutectic molten salt clearly defined the upper limit of the optimal operating temperature of the mixed molten salt. The results indicated that the upper-temperature limits of NaCl-KCl, NaCl-CaCl 2 , KCl-CaCl 2 , NaCl-MgCl 2 , and KCl-MgCl 2 are determined to be 1141 K, 1151 K, 1176 K, 1086 K, and 1068 K. The maximum working temperature was measured experimentally using a thermogravimetric analysis (TGA), and the relative error between the calculation and experiment was calculated. The maximum error between the calculated and experimental values of the maximum operating temperature was 6.02%, while the minimum was 1.29%, demonstrating the method’s high accuracy. Combined with the lowest eutectic temperature and the upper-temperature limits of binary chloride molten salts, the stable operating temperature ranges of NaCl-KCl, NaCl-CaCl 2 , KCl-CaCl 2 , NaCl-MgCl 2 , and KCl-MgCl 2 are 891~1141 K, 750~1151 K, 874~1176 K, 732~1086 K, and 696~1086 K.

Keywords: thermal stability calculation; upper-temperature limit; P-T phase diagram; modified quasi-chemical model; adiabatic flash calculation; binary chloride molten salts (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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