SELECTION AND THERMAL PROPERTIES STUDY OF NOVEL LOW-MELTING QUATERNARY NITRATE SALT

Wang Yue; Lu Yuanwei; Wang Yuanyuan; Wu Yuting; Zhang Cancan; Liu Jinkai

doi:10.19912/j.0254-0096.tynxb.2024-1191

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 85-90. DOI: 10.19912/j.0254-0096.tynxb.2024-1191

SELECTION AND THERMAL PROPERTIES STUDY OF NOVEL LOW-MELTING QUATERNARY NITRATE SALT

Wang Yue, Lu Yuanwei, Wang Yuanyuan, Wu Yuting, Zhang Cancan, Liu Jinkai

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Abstract

To lower the minimum operating temperature and broaden the working temperature range of mixed molten salts, a quaternary nitrate mixture of KNO₃-NaNO₂-KNO₂-Ca（NO₃）₂ was studied. Using DSC and TG analysis methods, a new low-melting-point quaternary nitrate was identified. The thermal stability of the new quaternary salt was investigated through isothermal weight loss measurements at various temperatures. Furthermore, its thermal properties such as specific heat, density, and thermal conductivity were tested and analyzed. The research findings indicate that the new quaternary salt has a melting point of 94.8 ℃, a decomposition temperature of 622.3 ℃, and an energy storage density of 696.43 kJ/kg. After maintaining a constant temperature of 550 ℃ for 48 hours, the sample exhibits a low weight loss rate of only 2.71%, demonstrating excellent thermal stability.

Key words

solar thermal power generation / low melting point / wide temperature range / quaternary nitrate/nitrite salts / thermal properties / heat storage material

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Wang Yue, Lu Yuanwei, Wang Yuanyuan, Wu Yuting, Zhang Cancan, Liu Jinkai. SELECTION AND THERMAL PROPERTIES STUDY OF NOVEL LOW-MELTING QUATERNARY NITRATE SALT[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 85-90 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1191

References

[1] 李强, 邓贵波, 张家瑞. 太阳能热发电参与调节的多源联合发电系统两阶段调度策略[J]. 太阳能学报, 2021, 42(12): 86-92.
LI Q, DENG G B, ZHANG J R.Two stage scheduling strategy of multi-source combined power generation system with concentred solar participating adjustment[J]. Acta energiae solaris sinica, 2021, 42(12): 86-92.
[2] 杜尔顺, 张宁, 康重庆, 等. 太阳能光热发电并网运行及优化规划研究综述与展望[J]. 中国电机工程学报, 2016, 36(21): 5765-5775.
DU E S, ZHANG N, KANG C Q, et al.Reviews and prospects of the operation and planning optimization for grid integrated concentrating solar power[J]. Proceedings of the CSEE, 2016, 36(21): 5765-5775.
[3] 季畅, 姜文超, 杨薛明. 纳米ZnO/三元氯化物熔盐热物性及腐蚀特性实验研究[J]. 太阳能学报, 2023, 44(11): 426-433.
JI C, JIANG W C, YANG X M.Experimental study on thermal properties and corrosion properties of nano-ZnO/ternary chloride molten salt[J]. Acta energiae solaris sinica, 2023, 44(11): 426-433.
[4] 林俊光, 仇秋玲, 罗海华, 等. 熔盐储热技术的应用现状[J]. 上海电气技术, 2021, 14(2): 70-73.
LIN J G, QIU Q L, LUO H H, et al.Application status of molten salt heat storage technology[J]. Journal of Shanghai electric technology, 2021, 14(2): 70-73.
[5] WU Y T, LIU S W, XIONG Y X, et al.Experimental study on the heat transfer characteristics of a low melting point salt in a parabolic trough solar collector system[J]. Applied thermal engineering, 2015, 89: 748-754.
[6] BERNAGOZZI M, PANESAR A S, MORGAN R.Molten salt selection methodology for medium temperature liquid air energy storage application[J]. Applied energy, 2019, 248: 500-511.
[7] REN N, WU Y T, MA C F, et al.Preparation and thermal properties of quaternary mixed nitrate with low melting point[J]. Solar energy materials and solar cells, 2014, 127: 6-13.
[8] 邹露璐, 吴玉庭, 马重芳. 低熔点四元混合硝酸盐的开发与实验研究[J]. 太阳能学报, 2020, 41(5): 27-32.
ZOU L L, WU Y T, MA C F.Experimental study of low melting point mixed nitrates[J]. Acta energiae solaris sinica, 2020, 41(5): 27-32.
[9] KWASI-EFFAH C C, EGWARE H O, OBANOR A I, et al. Development and characterization of a quaternary nitrate based molten salt heat transfer fluid for concentrated solar power plant[J]. Heliyon, 2023, 9(5): e16096.
[10] NARESH G, RAJASEKHAR A, BHARALI J, et al.Homogeneous molten salt formulations as thermal energy storage media and heat transfer fluid[J]. Journal of energy storage, 2022, 50: 104200.
[11] WANG Y Y, MA Y C, LU Y W, et al.Phase diagram thermodynamic calculation of KNO₃-NaNO₂-KNO₂ ternary system molten salt and its thermophysical properties investigation for thermal energy storage[J]. Journal of energy storage, 2024, 96: 112422.
[12] 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 C C, WU Y T, LU Y W.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.
[13] 盛鹏, 徐丽, 赵广耀, 等. 新型混合硝酸熔盐的制备及热物性研究[J]. 储能科学与技术, 2021, 10(1): 170-176.
SHENG P, XU L, ZHAO G Y, et al.Preparation and thermophysical properties of novel mixed nitrate molten salts[J]. Energy storage science and technology, 2021, 10(1): 170-176.
[14] WANG Y Y, LU Y W, WANG Y Q, et al.Investigation on thermal performance of quinary nitrate/nitrite mixed molten salts with low melting point for thermal energy storage[J]. Solar energy materials and solar cells, 2024, 270: 112803.
[15] WU Y T, LI Y, LU Y W, et al.Novel low melting point binary nitrates for thermal energy storage applications[J]. Solar energy materials and solar cells, 2017, 164: 114-121.
[16] LI N, WANG Y, LIU Q, et al.Evaluation of thermal-physical properties of novel multicomponent molten nitrate salts for heat transfer and storage[J]. Energies, 2022, 15(18): 6591.