Experimental Study on the Thermal Stability Characteristics of Molten Salts Based on Spectroscopic Techniques

YAN Yunpei; SONG Naihe; DING Yanjun; PENG Zhimin; DU Yanjun

doi:10.19805/j.cnki.jcspe.2025.250489

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Experimental Study on the Thermal Stability Characteristics of Molten Salts Based on Spectroscopic Techniques

更新时间：2026-10-10

- Experimental Study on the Thermal Stability Characteristics of Molten Salts Based on Spectroscopic Techniques
- Chinese Journal of Power Engineering Vol. 45, Issue 12, Pages: 2100-2109(2025)
- 作者机构：
  
  1. 华北电力大学控制与计算机工程学院,北京,102206
  2. 清华大学能源与动力工程系,北京,100084
  3. 怀柔实验室山西研究院,山西,太原,030032
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.250489
  CLC：
- Online First：16 December 2025，
  
  Published：16 December 2025
- 稿件说明：
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闫云沛,宋乃禾,丁艳军,彭志敏,杜艳君. 基于光谱技术的熔盐热稳定性特性的实验研究动力工程学报, 2025, 45(12): 2100-2109 https://doi.

org/10.19805/j.cnki.jcspe.2025.250489
闫云沛,宋乃禾,丁艳军,彭志敏,杜艳君. 基于光谱技术的熔盐热稳定性特性的实验研究动力工程学报, 2025, 45(12): 2100-2109 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.250489.

org/10.19805/j.cnki.jcspe.2025.250489 DOI：

摘要

针对熔盐储能技术中由熔盐高温热分解导致的安全隐患

旨在通过高精度在线监测其关键气态产物

进而系统性探究熔盐的高温分解行为及其机理。基于波长调制-直接吸收光谱(WM-DAS)技术

设计并搭建了一套可用于熔盐高温反应、产物动态实时高精度在线监测的实验系统

以实时动态检测熔盐分解产物NO和N

O的浓度。该系统对NO、N

O的体积分数测量下限低至2.610

-6

、2.110

-5

吸收率函数拟合残差标准差低至1.26910

-3

和1.41610

-4

。熔盐高温分解实验结果表明:单一亚硝酸钠熔盐分解温度为256 ℃

纯硝酸熔盐及三元硝酸熔盐(HTS熔盐)的分解温度更高

均为290 ℃;相同条件下

单一亚硝酸钠熔盐比包含等量亚硝酸钠的HTS熔盐产生更高的NO、N

O排放量;在500 ℃以上硝酸熔盐与石英材料反应会显著增加NO排放量。

Abstract

In response to the safety hazards caused by the high-temperature thermal decomposition of molten salts in molten salt energy storage technology

this study aims to systematically investigate the high-temperature decomposition behavior and mechanism of molten salts by conducting high-precision online monitoring of corresponding key gaseous products. Based on the wavelength modulation-direct absorption spectroscopy (WM-DAS) technique

an experimental system has been designed and constructed for the dynamic

real-time

and high-precision online monitoring of high-temperature reactions of molten salts and corresponding products

enabling the real-time detection of the concentrations of NO and N

which are decomposition products of molten salts. The sys

tem achieves lower detection limits of 2.610

-6

and 2.110

-5

for the volume fractions of NO and N

respectively

with remarkably low standard deviations of the fitting residuals for the absorbance function

at 1.26910

-3

and 1.41610

-4

respectively. The experimental results on the high-temperature decomposition of molten salts indicate that the decomposition temperature of pure sodium nitrite molten salt is 256 ℃

while both pure nitric acid molten salt and ternary nitrate molten salt (HTS molten salt) exhibit higher decomposition temperatures

both at 290 ℃. Under identical conditions

pure sodium nitrite molten salt generates higher NO and N

O emissions compared to HTS molten salt containing an equivalent amount of sodium nitrite. Additionally

reactions between nitric acid molten salt and quartz materials would significantly increase NO emissions at temperatures above 500 ℃.

关键词

Keywords

references

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