储能科学与技术 ›› 2016, Vol. 5 ›› Issue (4): 498-502.doi: 10.12028/j.issn.2095-4239.2016.04.013

• 研究及进展 • 上一篇    下一篇

三元硫酸熔盐的制备及其热稳定性能

朱教群，陈  维，周卫兵，李儒光，张弘光   

  1. 武汉理工大学材料科学与工程学院，湖北 武汉 430070
  • 收稿日期:2015-12-02 修回日期:2016-01-25 出版日期:2016-07-01 发布日期:2016-07-01
  • 通讯作者: 朱教群（1964—），男，研究员，博士生导师，主要从事新能源材料及保温材料方面研究，E-mail：zhujiaoq@whut.edu.cn。
  • 作者简介:朱教群（1964—），男，研究员，博士生导师，主要从事新能源材料及保温材料方面研究，E-mail：zhujiaoq@whut.edu.cn。
  • 基金资助:
    国家科技支撑计划资助项目（2012BAA05B03）。

Preparation and thermal stability of ternary sulfate molten salt

ZHU Jiaoqun, CHEN Wei, ZHOU Weibing, LI Ruguang, ZHANG Hongguang   

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2015-12-02 Revised:2016-01-25 Online:2016-07-01 Published:2016-07-01

PDF

561

被引次数

3

摘要：

以硫酸钠、硫酸钾和硫酸镁为原料，采用在硫酸钠-硫酸钾二元共晶盐中加入硫酸镁的方法制备三元硫酸熔盐。应用TG-DSC联用分析仪、热常数分析仪、X射线衍射仪以及热循环法对复合熔盐的熔点、相变潜热、热导率、比热容、分解点以及热稳定性进行表征。结果表明：所制备的三元硫酸熔盐熔点分布在667.5～669.7 ℃之间，较二元熔盐熔点降低了160 ℃左右，硫酸镁含量为30%（质量分数）的三元硫酸熔盐相变潜热值最大为94.3 J/g，比热容最大为1.13 J/(g·K)（720℃≤T≤800℃），导热系数为0.41 W/(m·K)，分解温度为1070 ℃，经50次热循环后，相变潜热值降低约4.34%，熔点和物相保持基本恒定，具有良好的热稳定性。该研究为硫酸盐作为高温传热蓄热介质提供了依据。

关键词: 熔融盐, 熔点, 分解温度, 热稳定性

Abstract:

Using the Na2SO4, K2SO4 and MgSO4 as raw materials. A new type of ternary sulfate molten salt was prepared by adding different content of MgSO4 in the range from 10% to 40% (weight ratio) to the binary eutectic salt of Na2SO4-K2SO4 The melting temperature, latent heat value, thermal conductivity, specific heat, decomposition temperature and thermal stability were tested by means of thermogravimetric analysis (TG) and differential scanning calorimetry (DSC), Thermal constants analyzer, X ray diffraction and thermal cycle tests. Experimental results showed that the ternary sulfate molten salt had a melting point which was distributed between 667.5 ℃ and 669.7 ℃. Whose melting point were 160 ℃ lower than that of binary sulfate molten salt, the ternary sulphate molten salt with 30% (weight ratio) MgSO4, had the highest latent heat value 94.3 J·g-1, the maximum specific heat capacity was 1.13 J·(g·K) -1 between 720 ℃ to 800 ℃, thermal conductivity was 0.41 W·(m·K) -1, and the decomposition temperature was 1070 ℃, after 50 times thermal cycle tests, the latent heat value slightly declined by 4.34%, the melting temperature and phase composition maintained the constant, indicated the ternary sulphate molten salt with 30% (weight ratio) MgSO4 had good thermal stability. The research provided basis for sulphate salt, which could be applied to high temperature heat transfer and heat storage medium.

Key words: molten salt, melting point, decomposition temperature, thermal stability