低熔点混合硝酸熔盐的制备及性能分析

doi:10.19799/j.cnki.2095-4239.2020.0023

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (2): 435-439.doi: 10.19799/j.cnki.2095-4239.2020.0023

• 庆祝陈立泉院士八十寿辰专刊 • 上一篇下一篇

低熔点混合硝酸熔盐的制备及性能分析

张灿灿, 吴玉庭(), 鹿院卫

北京工业大学环境与能源工程学院，传热强化与过程节能教育部重点实验室，传热与能源利用北京市重点实验室，北京 100124

收稿日期:2020-01-08 修回日期:2020-01-20 出版日期:2020-03-05 发布日期:2020-03-15
通讯作者: 吴玉庭 E-mail:wuyuting@bjut.edu.cn
作者简介:张灿灿(1988—)，男，助理研究员,E-mail：zcc@bjut.edu.cn；
基金资助:
国家重点研发计划(2017YFB0903603);国家自然科学基金(51906003┫项目。)

Preparation and comparative analysis of thermophysical properties on low melting point mixed nitrate molten salts

ZHANG Cancan, WU Yuting(), LU Yuanwei

MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China

Received:2020-01-08 Revised:2020-01-20 Online:2020-03-05 Published:2020-03-15
Contact: Yuting WU E-mail:wuyuting@bjut.edu.cn

摘要/Abstract

摘要：

混合硝酸盐具有低成本、低熔点和腐蚀性小等优点，广泛应用于太阳能光热发电及储能工程中。本团队经过十余年的完全自主研发，成功得到了低熔点高分解温度的LMPS系列混合硝酸熔盐。本工作首先采用同步热分析仪对不同种类混合硝酸盐的熔点和分解温度进行测试分析，与其他种类混合硝酸盐对比发现，LMPS II熔盐具有最低的熔点温度和最高的分解温度，液态范围区间最大。其次通过对1200 h高温恒温实验结果分析发现，低熔点混合四元硝酸盐的熔点最大波动范围为±4.89%，其分解温度的最大波动范围为±3.54%。LMPS II的比热容，导热系数和综合成本均优于LMPS I和LMPS III，因此在实际的工程应用中，低熔点、低成本和高分解温度的LMPS II具有优良的传热蓄热性能，同时可以减少系统的运行成本及其冻堵风险。

关键词: 储热, 低熔点, 熔盐, 混合硝酸盐

Abstract:

Mixed Nitrates Molten salt as heat transfer and storage medium have been widely applied in commercial solar power plant and thermal energy storage. After more than ten years of independent research and development, our team has successfully obtained LMPS series mixed nitric acid molten salt with low melting point and high decomposition temperature. Firstly, the DSC and TG curves of different mixed nitrates are measured and analyzed in this paper. It is found that the melting point of LMPS II quaternary mixed nitrate salt is the lowest, the decomposition temperature is the highest, and the liquid range was the largest. Secondly, the results of 1200 hours constant high temperature test show that the fluctuation range of melting point is no more than ±4.89% and decomposition temperature of mixed quaternary nitrate salt at low melting point is no more than ±3.54%.The specific heat capacity and thermal conductivity of LMPS II quaternary salt are better than that of LMPS I quaternary salt and LMPS III binary salt. Therefore, in practical engineering applications, the quaternary nitrate salt of LMPS II with low melting point and high decomposition temperature has excellent heat transfer and heat storage performance; it can reduce the operating cost of the system and the risk of freezing.

Key words: thermal energy storage, low melting point, molten salt, mixed nitrate molten salts

中图分类号:

TM 123

张灿灿, 吴玉庭, 鹿院卫. 低熔点混合硝酸熔盐的制备及性能分析[J]. 储能科学与技术, 2020, 9(2): 435-439.

ZHANG Cancan, WU Yuting, LU Yuanwei. Preparation and comparative analysis of thermophysical properties on low melting point mixed nitrate molten salts[J]. Energy Storage Science and Technology, 2020, 9(2): 435-439.

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名称	NaNO₃	KNO₃	NaNO₂	Ca(NO₃)₂	LiNO₃
Solar salt	√	√	—	—	—
Hitec	√	√	√	—	—
Hitec XL	√	√	—	√	—
LMPS I	√	√	—	√	√
LMPS II	√	√	√	√	—
LMPS III	—	√	—	√	—

名称	储热密度/kW·h·t^-1	材料成本 /元·(kW·h) ^-1	系统成本 /元·(kW·h)^-1
Solar salt	110	38	82
Hitec	113	42	85
LMPS I	190	63	88
LMPS II	199	25	49.3
LMPS III	137	29	60

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低熔点混合硝酸熔盐的制备及性能分析

Preparation and comparative analysis of thermophysical properties on low melting point mixed nitrate molten salts

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