RESEARCH ON CALCULATION METHODS OF NaCl-MgCl2-CaCl2 PHASE DIAGRAM

Li Yuanyuan; Zhang Xiang; Miao Zhichang

doi:10.19912/j.0254-0096.tynxb.2021-0454

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (10) : 395-399. DOI: 10.19912/j.0254-0096.tynxb.2021-0454

RESEARCH ON CALCULATION METHODS OF NaCl-MgCl₂-CaCl₂ PHASE DIAGRAM

Li Yuanyuan, Zhang Xiang, Miao Zhichang

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Abstract

Energy storage materials have been widely studied and used to meet heat transfer requirements and storage in large-scale solar thermal power generation. Taking the thermal physical properties and economy of molten salt as screening conditions, ternary molten salt systems of NaCl, MgCl₂, and CaCl₂ with wide sources, low price, wide operating temperature range, low viscosity, and large latent heat of phase transition were selected for in-depth study. Based on the sub-binary system., the modified quasi-chemical solution model was used to calculate the phase diagram of ternary mixed molten salt NaCl-MgCl₂-CaCl₂. The calculated results show that the eutectic point temperature of the molten salt mixture is 412.45 ℃, and the molar fractions of NaCl, MgCl₂, and CaCl₂ is 50.99%, 22.78%, and 26.23%, respectively. Compared with the existing literature data, the error is less than 3%, which verifies the accuracy of the method. It lays a partial foundation for the construction of a phase diagram database of molten salt chloride.

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Li Yuanyuan, Zhang Xiang, Miao Zhichang. RESEARCH ON CALCULATION METHODS OF NaCl-MgCl₂-CaCl₂ PHASE DIAGRAM[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 395-399 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0454

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