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1.天津商业大学机械工程学院 天津 300134
2. 北京理工大学机械与车辆学院 北京 100081
李健,男,博士,特别研究员,北京理工大学机械与车辆学院,E-mail:lijian2022@bit.edu.cn。研究方向:相变储热、卡诺电池、高温固体储热等先进储能技术。
收稿:2026-07-20,
修回:2026-08-01,
录用:2026-08-21,
网络首发:2026-09-24,
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崔俊豪,胡开永,李健,等. 硝酸锂/膨胀石墨复合相变材料的制备及热物性研究[J]. 制冷学报,XXXX,XX(XX):1-10.
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崔俊豪,胡开永,李健,等. 硝酸锂/膨胀石墨复合相变材料的制备及热物性研究[J]. 制冷学报,XXXX,XX(XX):1-10. DOI: 10.12465/issn.0253-4339.20260720003.
Cui Junhao,Hu Kaiyong,Li Jian,et al. Preparation and Thermophysical Properties Study of Lithium Nitrate/Expanded Graphite Composite Phase Change Materials[J]. Journal of Refrigeration,XXXX,XX(XX):1-10. DOI: 10.12465/issn.0253-4339.20260720003.
中高温余热具有间歇性和波动性,相变储热是缓解热量供需不匹配的有效途径。LiNO
3
具有适宜的相变温度和较高的相变焓,但较低的热导率限制了其储热速率。本文以LiNO
3
为相变材料、以EG(膨胀石墨,expanded graphite)为导热增强材料,采用溶剂挥发法制备了LiNO
3
/EG复合相变材料,并通过实验与仿真分析其热物性及储热性能。结果表明:LiNO
3
进入EG多孔结构,并形成物理复合结构。随着EG质量分数增加,复合相变材料的热导率逐渐提高,而相变焓持续降低。当EG质量分数为15%(CPCM85,85% LiNO
3
/15% EG)时,其热导率达到3.53 W/(m·K),相变焓仍保持291.3 kJ/kg,LiNO
3
组分残余率相比纯LiNO
3
提升36.4%,在所有配比方案中热稳定性最佳;综合热导率、相变焓及热稳定性,确定CPCM85为最优的配比方案。仿真结果表明,CPCM85具有比LiNO
3
更高的储热速率。
Objective
2
Medium- and high-temperature waste heat is intermittent and fluctuating, resulting in a mismatch between heat supply and demand. Latent heat storage based on phase change materials (PCMs) provides an effective method for high-density thermal energy storage. Lithium nitrate (LiNO
3
) has a suitable phase change temperature and high phase change enthalpy for waste heat recovery, but its low thermal conductivity limits the volumetric power density. In this study, using LiNO
3
as the PCM and expanded graphite (EG) as the material for enhancing thermal conductivity, LiNO
3
/EG composite phase change materials (CPCMs) were prepared, and their thermophysical properties and heat storage performance were investigated.
Methods
2
LiNO
3
/EG CPCMs with EG mass fractions of 5%, 10%, 15%, and 20% were prepared via a solvent evaporation method. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), transient plane source (TPS), and thermogravimetric analysis-derivative thermogravimetry (TG-DTG) characterized the chemical compatibility, phase composition, phase change properties, thermal conductivity, and thermostability. A computational fluid dynamics (CFD) a
nalysis of a shell-and-tube latent heat storage unit was conducted to evaluate the heat storage behavior of CPCM85 (85% LiNO
3
/15% EG) and pure LiNO
3
under flue gas heating.
Results and Discussions
2
FTIR and XRD results showed that no new chemical phases were formed, and LiNO
3
was physically confined within the EG porous structure. Increasing EG content improved thermal conductivity but reduced phase change enthalpy. CPCM85 exhibited a phase change temperature of 260.46 ℃, a phase change enthalpy of 291.3 kJ/kg, and a thermal conductivity of 3.53 W/(m·K), with the thermal conductivity 6.92 times higher than that of pure LiNO
3
. The residual rate of PCM components increased from 24.05% to 32.81%. The CFD results showed that the melting time decreased from 4 167 s to 2 178 s, and the heat storage rate reached 35 W at 5 000 s, which was 4.93 times that of pure LiNO
3
.
Conclusions
2
Considering the thermal conductivity, phase change enthalpy, and thermogravimetric characteristics, CPCM85 exhibited a favorable overall performance and was selected for the simulation, indicating its potential application in medium- and high-temperature waste heat recovery systems.
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声明:本文作者声明 ,在论文准备、撰写和修改过程中未使用生成式人工智能(AIGC)工具,论文内容、数据分析及结论均由作者独立完成。
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