添加纳米SiO2对四元溴化盐相变热物性的影响

doi:10.11949/j.issn.0438-1157.20161015

化工学报 ›› 2017, Vol. 68 ›› Issue (4): 1299-1305.DOI: 10.11949/j.issn.0438-1157.20161015

添加纳米SiO₂对四元溴化盐相变热物性的影响

熊亚选¹, 栗博¹, 吴玉庭², 史建峰¹, 马重芳²

1 北京建筑大学供热供燃气通风及空调工程北京市重点实验室, 北京 100044;
2 北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室, 北京 100124

收稿日期:2016-07-20 修回日期:2016-10-26 出版日期:2017-04-05 发布日期:2017-04-05
通讯作者: 熊亚选
基金资助:
国家自然科学基金项目（51206004）；北京市自然科学基金重点项目（3151001）。

Improving phase change thermal properties of quaternary bromides by adding SiO₂ nanoparticle

XIONG Yaxuan¹, LI Bo¹, WU Yuting², SHI Jianfeng¹, MA Chongfang²

1 Key Laboratory of HVAC, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2 Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conservation of Beijing Municipality, Beijing University of Technology, Beijing 100124, China

Received:2016-07-20 Revised:2016-10-26 Online:2017-04-05 Published:2017-04-05
Supported by:
supported by the National Natural Science Foundation of China (51206004) and the Natural Science Foundation of Beijing (3151001).

摘要/Abstract

摘要：

熔点、熔化潜热和分解温度是熔盐传热蓄热材料的重要热物性参数。以分析纯NaBr、KBr、CaBr₂和LiBr配制四元溴化盐，分别将颗粒平均直径为10、20、50 nm的纳米SiO₂颗粒按一定含量分散入所配制四元溴化盐中配制得到25种不同含量和粒径的纳米SiO₂溴化盐，利用DSC法研究添加纳米SiO₂含量和粒径对四元溴化盐熔点、熔化潜热及分解温度的影响。结果表明，随着纳米SiO₂含量的增大，溴化盐的熔点先降低后升高，但变化范围较小；熔化潜热先升高后逐步降低，变化较大。添加10 nm SiO₂颗粒含量为质量分数1.5%时，最大熔化潜热为47.06 J·g^-1，提高89.6%；添加10 nm SiO₂颗粒含量为质量分数0.7%时，最高分解温度为876.3℃。

关键词: 四元溴化盐, 纳米SiO₂, 制备, 相变, 熔点, 熔化潜热, 分解温度, 热力学性质

Abstract:

Melt temperature, fusion heat and decomposition temperature are three fundamental thermo-physical properties of molten salt. Based on NaBr (AR), KBr (AR), CaBr₂ (AR) and LiBr (AR) 25 quaternary bromides with different average diameter (10 nm, 20 nm and 50 nm) and mass concentration of SiO₂ nanoparticles were prepared. Differential scanning calorimetry (DSC) was employed to investigate melt temperature, fusion heat and decomposition temperature of the 25 quaternary bromides with SiO₂ nanoparticles. Experimental results showed that the melting point of the nano-quaternary bromides decreased first and then increased subsequently with the increase of SiO₂ nanoparticles. The fusion heat increased first and then decreased, which varies greatly with the increase of SiO₂ nanoparticles. As the mass concentration of the 10 nm SiO₂ nanoparticles is 1.5%, nano-quaternary bromides reached a maximum fusion heat of 47.06 J·g^-1, which increased by 89.6%. As the mass concentration of the 10 nm SiO₂ nanoparticles is 0.7%, nano-quaternary bromides reached a maximum decomposition temperature of 876.3℃.

Key words: quaternary bromides, SiO₂ nanoparticles, preparation, phase change, melting point, fusion heat, decomposition temperature, thermodynamic properties

中图分类号:

TB321

熊亚选, 栗博, 吴玉庭, 史建峰, 马重芳. 添加纳米SiO₂对四元溴化盐相变热物性的影响[J]. 化工学报, 2017, 68(4): 1299-1305.

XIONG Yaxuan, LI Bo, WU Yuting, SHI Jianfeng, MA Chongfang. Improving phase change thermal properties of quaternary bromides by adding SiO₂ nanoparticle[J]. CIESC Journal, 2017, 68(4): 1299-1305.

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添加纳米SiO₂对四元溴化盐相变热物性的影响

Improving phase change thermal properties of quaternary bromides by adding SiO₂ nanoparticle

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