Experimental study and mechanism analysis for high-temperature thermal stability of ternary nitrate salt

PENG Qiang; YANG Xiaoxi; DING Jing; WEI Xiaolan; YANG Jianping

doi:10.3969/j.issn.0438-1157.2013.05.001

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Experimental study and mechanism analysis for high-temperature thermal stability of ternary nitrate salt

更新时间：2025-12-10

- Experimental study and mechanism analysis for high-temperature thermal stability of ternary nitrate salt
- CIESC Journal Issue 5, Pages: 1507-1512(2013)
- 作者机构：
  
  1. 华南理工大学化学与化工学院传热强化与过程节能教育部重点实验室,广东,广州,510640
  2. 东莞理工学院广东省分布式能源系统重点实验室,广东,东莞,523808
  3. 中山大学工学院,广东,广州,510006
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.05.001
  CLC： K02
- Online First：05 May 2013，
  
  Published：05 May 2013
- 稿件说明：
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PENG Qiang, YANG Xiaoxi, DING Jing, et al. Experimental study and mechanism analysis for high-temperature thermal stability of ternary nitrate salt[J]. CIESC Journal, 2013, (5): 1507-1512.
DOI：

PENG Qiang, YANG Xiaoxi, DING Jing, et al. Experimental study and mechanism analysis for high-temperature thermal stability of ternary nitrate salt[J]. CIESC Journal, 2013, (5): 1507-1512. DOI： 10.3969/j.issn.0438-1157.2013.05.001.

摘要

通过熔盐质量损失率和试样中NO2-含量变化状况

以及熔盐材料的热重(TG)曲线

研究了三元硝酸熔盐(53%KNO3- 40%NaNO2-7%NaNO3)在空气和氮气气氛中高温条件下的热稳定性性能。结果表明

三元硝酸熔盐空气中的上限使用温度为773 K

高温时存在劣化现象;而在氮气气氛中三元熔盐的热分解温度为723 K。同时

从热力学和动力学角度分析得到

三元硝酸熔盐在773 K以下空气中发生的反应为亚硝酸钠的分解和氧化;而在氮气气氛中三元熔盐723 K以下时主要发生的是亚硝酸钠的分解反应。在氧气含量一定的情况下

氧气的扩散和亚硝酸盐的分解反应符合一级反应动力学模型。

Abstract

High-temperature thermal stability of ternary nitrate salt(53%KNO3-40%NaNO2-7%NaNO3)in air and nitrogen is investigated by mass loss ratio

NO2- content of molten salt and thermo-gravimetric analysis.The results show the upper limit of operation temperature is 773 K in air for the ternary nitrate salt and the deterioration will appear at higher temperatures

while the thermal decomposition begins at 723 K and proceeds slowly in nitrogen.According to the thermodynamics and kinetics of molten salt

the thermal decomposition and oxidation of sodium nitrite of the ternary nitrate salt occur below 773 K in air

while the reaction for the ternary salt in nitrogen is the thermal decomposition of sodium nitrite below 723 K.Diffusion of oxygen and decomposition reaction of nitrite follow the first order reaction kinetics when the oxygen content is constant.

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