储能硝酸熔盐的热稳定性分析

doi:10.12034/j.issn.1009-606X.218143

过程工程学报 ›› 2018, Vol. 18 ›› Issue (6): 1315-1322.DOI: 10.12034/j.issn.1009-606X.218143

储能硝酸熔盐的热稳定性分析

胡憧憬^1,2，孙泽^1,2*，黄龙^2,3，张海军^3,4，宋兴福^1,2，于建国^1,2

1. 华东理工大学资源与环境工程学院，上海 200237 2. 国家盐湖资源综合利用工程技术研究中心，上海 200237 3. 青海盐湖工业股份有限公司，青海格尔木 816000 4. 青海盐湖硝酸盐业股份有限公司，青海格尔木 816000

收稿日期:2018-03-09 修回日期:2018-04-11 出版日期:2018-12-22 发布日期:2018-12-19
通讯作者: 孙泽 zsun@ecust.edu.cn
基金资助:
熔融态相变储能硝酸盐体系中杂质离子竞争结晶、迁移规律研究

Analysis on thermal stability of molten nitrates at high temperatures

Chongjing HU^1,2, Ze SUN^1,2*, Long HUANG^2,3, Haijun ZHANG^3,4, Xingfu SONG^1,2, Jianguo YU^1,2

1. School of Resource and Environment Engineering, East China University of Science and Technology, Shanghai 200237, China 2. National Engineering Research Center for Integrated Utilization of Salt Lake Resource, Shanghai 200237, China 3. Qinghai Salt Lake Industry Group Co., Ltd., Golmud, Qinghai 816000, China 4. Qinghai Salt Lake Nitrates Industry Group Co., Ltd., Golmud, Qinghai 816000, China

Received:2018-03-09 Revised:2018-04-11 Online:2018-12-22 Published:2018-12-19
Contact: Ze Sun zsun@ecust.edu.cn

摘要/Abstract

摘要： 研究了商业化储能二元混合硝酸熔盐Solar salt (60% NaNO3?40% KNO3)的热稳定性和恒温热稳定性，采用热重法分析了其热分解温度，通过恒温实验考察了处于开放空气气氛中的NaNO3, KNO3和Solar salt在不同温度下的热稳定性，研究了NaNO3和KNO3在Solar salt高温不稳定性中的作用. 结果表明，大于500℃时温度越高，熔盐越不稳定，相同温度下不稳定程度NaNO3>Solar salt>KNO3. 温度升高，分解产物NO2?平衡含量增大而达到平衡的时间缩短，O2?含量很低. Solar salt中硝酸盐热分解和挥发的质量损失比接近1:1，NaNO3是造成体系热分解的主要原因，而KNO3起到抗挥发的作用.

关键词: 硝酸熔盐, 热稳定性, 质量损失机理, 热分解, 挥发

Abstract: As heat transfer fluids and heat storage mediums, the molten nitrates have been widely used in the solar thermal power generation system in latest years, among which Solar salt system (60% NaNO3?40% KNO3, mass ratio) is the most optimized one. However, there still exists lots of problems in large-scale industrial application, for example, the high temperature stability of Solar salt system is not clear enough. Thus this work aims to investigate the thermal stability of Solar salt system under the conditions of thermal storage and constant high temperatures. The thermal decomposition temperature of Solar salt system was detected by thermo-gravimetric (TG). Meanwhile, constant high temperature experiment of NaNO3, KNO3 and Solar salt were studied in an open system at different temperatures. The constant thermal stability values of Solar salt system and the roles of NaNO3 and KNO3 played in its high-temperature instability were obtained. The high temperature instability of Solar salt system was manifested as mass loss, which was mainly caused by thermal decomposition and volatilization of components. The TG result showed that the thermal decomposition temperature of Solar salt system was 590.6℃ in nitrogen atmosphere. The constant high-temperature experiment showed that Solar salt system was unstable above 500℃ in air, and the higher temperature was, the more unstable of it. The degree of instability was NaNO3>Solar salt system>KNO3 under the same temperature. The content of the decomposed product NO2? eventually reached an equilibrium at some time, and the equilibrium content of NO2? increased while equilibrium time of the reaction decreased as the rising of temperature. However, another decomposed product metal oxides was low. Besides, the mass loss of Solar salt caused by thermal decomposition and volatilization was close to 1:1. In the Solar salt system, NaNO3 was the main cause of thermal decomposition, and KNO3 played the role of anti-volatilization.

Key words: Molten nitrates, thermal stability, mass loss mechanism, thermal decomposition, vaporization

胡憧憬孙泽黄龙张海军宋兴福于建国. 储能硝酸熔盐的热稳定性分析[J]. 过程工程学报, 2018, 18(6): 1315-1322.

Chongjing HU Ze SUN Long HUANG Haijun ZHANG Xingfu SONG Jianguo YU. Analysis on thermal stability of molten nitrates at high temperatures[J]. Chin. J. Process Eng., 2018, 18(6): 1315-1322.

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储能硝酸熔盐的热稳定性分析

Analysis on thermal stability of molten nitrates at high temperatures

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