Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO3-Na2SO4 Ternary System

doi:10.1007/s40242-018-7339-3

高等学校化学研究 ›› 2018, Vol. 34 ›› Issue (3): 475-479.doi: 10.1007/s40242-018-7339-3

Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System

LI Xiang^1,2, FEI Zejie¹, WANG Yang¹, XIE Leidong¹

1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China;
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China

收稿日期:2017-11-01 修回日期:2017-11-22 出版日期:2018-06-01 发布日期:2017-12-11
通讯作者: FEI Zejie, XIE Leidong E-mail:feizejie@sinap.ac.cn;xieleidong@sinap.ac.cn
基金资助:
Supported by the National Natural Science Foundation of China(No.21703281) and the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XD02002400).

Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System

LI Xiang^1,2, FEI Zejie¹, WANG Yang¹, XIE Leidong¹

1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China;
2. University of Chinese Academy of Sciences, Beijing 100049, P. R. China

Received:2017-11-01 Revised:2017-11-22 Online:2018-06-01 Published:2017-12-11
Contact: FEI Zejie, XIE Leidong E-mail:feizejie@sinap.ac.cn;xieleidong@sinap.ac.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.21703281) and the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XD02002400).

摘要/Abstract

摘要： Molten salts as heat transfer and storage materials have been used to nuclear energy and concentrated solar power(CSP) applications. In this work, the system of molten salt mixture based on thermodynamic principles was designed as thermal energy storage(TES) materials. The substitutional solution model can be employed to describe the Gibbs energies of all liquid phase. Thermodynamic model parameters for the NaCl-NaNO₃-Na₂SO₄ subsystems were conducted by thermodynamic evaluation and optimization based on experimental phase-equilibria data. Thus, a set of self-consistent thermodynamic database was eventually obtained to reliably calculate the whole phase diagram and thermodynamic properties for the NaCl-NaNO₃-Na₂SO₄ternary system. The results manifest that the eutectic point of theternary system located at T=280℃ and x_NaCl=8.4%, x_NaNO3=86.3% and x_Na2SO4=5.3%. Moreover, the results predicted were verified experimentally using differential scanning calorimetry(DSC) and the agreement between the measured value[T=(287±2)℃] and predicted value(T=280℃) was satisfactory. Thus, the thermodynamic calculation method will be used to design and develop novel molten salt mixture as thermal energy storage materials.

关键词: Thermodynamics modeling, Molten salt, Thermal energy storage, Phase diagram

Abstract: Molten salts as heat transfer and storage materials have been used to nuclear energy and concentrated solar power(CSP) applications. In this work, the system of molten salt mixture based on thermodynamic principles was designed as thermal energy storage(TES) materials. The substitutional solution model can be employed to describe the Gibbs energies of all liquid phase. Thermodynamic model parameters for the NaCl-NaNO₃-Na₂SO₄ subsystems were conducted by thermodynamic evaluation and optimization based on experimental phase-equilibria data. Thus, a set of self-consistent thermodynamic database was eventually obtained to reliably calculate the whole phase diagram and thermodynamic properties for the NaCl-NaNO₃-Na₂SO₄ternary system. The results manifest that the eutectic point of theternary system located at T=280℃ and x_NaCl=8.4%, x_NaNO3=86.3% and x_Na2SO4=5.3%. Moreover, the results predicted were verified experimentally using differential scanning calorimetry(DSC) and the agreement between the measured value[T=(287±2)℃] and predicted value(T=280℃) was satisfactory. Thus, the thermodynamic calculation method will be used to design and develop novel molten salt mixture as thermal energy storage materials.

Key words: Thermodynamics modeling, Molten salt, Thermal energy storage, Phase diagram

LI Xiang, FEI Zejie, WANG Yang, XIE Leidong. Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System[J]. 高等学校化学研究, 2018, 34(3): 475-479.

LI Xiang, FEI Zejie, WANG Yang, XIE Leidong. Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System[J]. Chemical Research in Chinese Universities, 2018, 34(3): 475-479.

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Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System

Experimental Investigation and Thermodynamic Modeling of the NaCl-NaNO₃-Na₂SO₄ Ternary System

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