Design and thermal stability study of LiNO3-NaNO3-KNO3 ternary molten salt system

ZHAO Baicen; DING Jing; WEI Xiaolan; LIU Bin; LU Jianfeng; WANG Weilong

doi:10.11949/j.issn.0438-1157.20181406

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Design and thermal stability study of LiNO₃-NaNO₃-KNO₃ ternary molten salt system

Thermodynamics | 更新时间：2026-07-24

- Design and thermal stability study of LiNO₃-NaNO₃-KNO₃ ternary molten salt system
- CIESC Journal Vol. 70, Issue 6, Pages: 2083-2091(2019)
- 作者机构：
  
  1.中山大学材料科学与工程学院，广东广州 510006
  2.华南理工大学化学与化工学院，广东广州 510640
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181406
  CLC： TK 02
- Received：26 November 2018，
  
  Revised：2019-03-01，
  
  Online First：15 June 2020，
  
  Published：05 June 2019
- 稿件说明：
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赵柏岑, 丁静, 魏小兰, 刘彬, 陆建峰, 王维龙. LiNO₃-NaNO₃-KNO₃三元熔盐材料的设计及热稳定性研究[J]. 化工学报, 2019, 70(6): 2083-2091 DOI: 10.11949/j.issn.0438-1157.20181406.

ZHAO Baicen, DING Jing, WEI Xiaolan, LIU Bin, LU Jianfeng, WANG Weilong. Design and thermal stability study of LiNO₃-NaNO₃-KNO₃ ternary molten salt system[J]. CIESC Journal, 2019, 70(6): 2083-2091 DOI: 10.11949/j.issn.0438-1157.20181406.
赵柏岑, 丁静, 魏小兰, 刘彬, 陆建峰, 王维龙. LiNO₃-NaNO₃-KNO₃三元熔盐材料的设计及热稳定性研究[J]. 化工学报, 2019, 70(6): 2083-2091 DOI: 10.11949/j.issn.0438-1157.20181406. DOI：

ZHAO Baicen, DING Jing, WEI Xiaolan, LIU Bin, LU Jianfeng, WANG Weilong. Design and thermal stability study of LiNO₃-NaNO₃-KNO₃ ternary molten salt system[J]. CIESC Journal, 2019, 70(6): 2083-2091 DOI: 10.11949/j.issn.0438-1157.20181406. DOI：

摘要

采用共形离子溶液模型(conformalionic solution model

CIS) 在二元熔盐体系相图的基础上，对三元熔盐体系LiNO

-NaNO

-KNO

进行了相图计算，得到该三元体系最低共熔点为117.7℃，相应的摩尔分数组成分别为

(LiNO

) = 0.375，

(NaNO

) = 0.075，

(KNO

) = 0.550。按照热力学最低共熔点计算结果，采用熔融法制备了三元硝酸熔盐，通过DSC和TG实验测定其最低共熔点为118.3℃，这与计算得到的结果(117.7℃)基本一致。TG测试结果表明当温度低于587.2℃时，该三元熔盐体系较为稳定，其工作温度范围为118.3~587.2℃，该三元硝酸熔盐适合在太阳能热发电中作为高温传热蓄热材料使用。

Abstract

According to the binary molten salt system phase diagrams

the phase diagram of LiNO

-NaNO

-KNO

ternary molten salt system was calculated with the CIS model

it turned out that

the lowest eutectic melting point was 117.7℃ and the corresponding composition was

(LiNO

) = 0.375，

(NaNO

) = 0.075 and

(KNO

) = 0.550. The eutectic mixture was prepared based on the predicted eutectic composition

and a experiment test was carried out by the thermal gravimetric analysis (TG) and differential scanning calorimeter (DSC). The DSC test showed that the experimental melting point was 117.7℃

which was in good agreement with the result of this calculation. The TG test results show that the ternary molten salt system is stable when the temperature is below 587.2°C

and its working temperature range is 118.3—587.2°C. The system is quite suitable as a material for high-temperature heat transfer and heat storage in solar thermal power generation.

关键词

Keywords

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