摘要
设计和搭建热冲击实验系统,以旋流滞止火焰形式对复合无机相变储热材料进行垂直热冲击,研究高温下热冲击对储热材料的热性能、微观结构、化学稳定性的影响并评价其安全性。结果表明,由于热传导、热对流和热辐射综合作用于复合无机相变储热材料上,适度热冲击,热量可被储热材料吸收并储存,熔融盐硝酸钠发生物理相变,温度下降后能基本恢复原样,储热性能稳定;而过度热冲击,过高的热量和温度会导致熔融盐硝酸钠的分解,生成亚硝酸钠和氧气,如温度不断升高,会进一步分解生成一氧化氮和二氧化氮,储热能力会急剧降低,甚至失去储热能力而导致毁损。这对于储热材料在工业应用中的储热稳定性、化学稳定性和使用安全性具有重要指导意义。
This paper designs and sets up a thermal shock experiment system,performs vertical thermal shock on the composite inorganic phase change thermal storage materials in the form of swirling stagnation flame,and studies the thermal shock on thermal storage at high temperatures.The thermal properties,microstructure,and chemical stability of the material were evaluated and their safety was evaluated.The results show that due to the combined effect of thermal conduction,thermal convection,and thermal radiation on the composite inorganic phase change thermal storage material,moderate thermal shock can reduce heat the thermal storage material absorbs and stores,and the molten salt sodium nitrate undergoes a physical phase change.After the temperature drops,it can basically return to the original state,and the thermal storage performance is stable.Excessive thermal shock,excessive heat and temperature will cause the decomposition of the molten salt sodium nitrate and generate if the temperature of sodium nitrite and oxygen continues to rise,it will further decompose to produce nitric oxide and nitrogen dioxide,and the heat storage capacity will be sharply reduced or even lost,resulting in damage.This has important guiding significance for the thermal storage stability,chemical stability,and safety of use of thermal storage materials in industrial applications.
作者
刘亮
吴爱枝
黄云
黄剑
LIU Liang;WU Ai-zhi;HUANG Yun;HUANG Jian(Beijing Academy of Safety Science and Technology,Beijing 101101,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《应用化工》
CAS
CSCD
北大核心
2021年第4期878-882,共5页
Applied Chemical Industry
基金
国家重点基础研究发展计划(2015BAA01B02)
国家自然科学基金(11847140)
陕西省自然科学基础研究计划(2019JQ-490)。
关键词
储热材料
热冲击
热性能
热分解
安全性
thermal storage material
thermal shock
thermal performance
thermal decomposition
safety
