Thermal properties of a low-melting-point nitrate molten salt system

doi:10.12028/j.issn.2095-4239.2018.0051

Abstract

Abstract: The thermal properties of a Ca(NO₃)₂-KNO₃ (0.47:0.53) based nitrate molten salt with an additive (0.1% to 15%) was prepared, characterized and cost-analyzed. Such a system has a low melting point, a high specific heat capacity and a high thermal decomposition temperature. It was shown that the new formulation had a melting point of 120.1℃ with a latent heat of fusion of 76.37 J·g^-1, a decomposition temperature of 588℃, and an average specific heat of 1.598 J·(g·K)^-1, illustrating an enhanced performance than traditional solar salt and Hitec formulations. The results also suggested a cost of RMB 108 yuan per kW·h.

Key words: nitrate, molten salt medium, latent heat, thermodynamic

CLC Number:

TQ146
TK02

SHENG Peng, ZHAO Guangyao, XU Li, LI Guangbin, MA Guang, CHEN Xin, HAN Yu, ZOU Lulu, WU Yuting. Thermal properties of a low-melting-point nitrate molten salt system[J]. Energy Storage Science and Technology, 2018, 7(4): 682-686.

References

[1] MYERS JR P D, ALAM T E, KAMAL R, et al. Nitrate salts doped with CuO nanoparticles for thermal energy storage with improved heat transfer[J]. Applied Energy, 2016, 165:225-233.
[2] 杨敏林, 杨晓西, 林汝谋. 太阳能热发电技术与系统[J]. 热能动力工程, 2008, 23(3):221-228. YANG Minlin, YANG Xiaoxi, LIN Rumou. Jouranl of engineering for thermal energy and power[J]. Journal of Engineering for Thermal Energy and Power, 2008, 23(3):221-228.
[3] FARID M M, KHUDHAIR A M, RAZACK S A, et al. A review on phase change energy storage:Materials and applications[J]. Energy Conversion and Management, 2004, 45:1597-1615.
[4] Natinal Energy Administration. Solar energy development "13th five-year plan"[R]. 2016.
[5] 李石栋, 张仁元, 李风, 等. 储热材料在聚光太阳能热发电中的研究进展[J]. 材料导报, 2010, 24(11):51-55. LI Shidong, ZHANG Renyuan, LI Feng, et al. Research progress in thermal storage material applied in concentrating solar power[J]. Materials Review, 2010, 24(11):51-55.
[6] 王辉. 太阳能光热发电系统中储热材料研究进展[J]. 电力与能源, 2013(3):399-400. WANG Hui. Research progress of thermal storage materials in concentrating solar thermal power generation[J]. Science and Technology Information, 2013(3):399-400.
[7] 赵倩, 王俊勃, 宋宇宽, 等. 熔融盐高储热材料的研究进展[J]. 无机盐工业, 2014, 46(11):5-8. ZHAO Qian, WANG Junbo, SONG Yukuan, et al. Research progress in high heat storage material of molten salt[J]. Inorganic Chemicals Industry, 2014, 46(11):5-8.
[8] 张京亮, 赵杉林, 赵荣祥, 等. 现代二氧化碳吸附研究[J]. 当代化工, 2011, 40(1):88-91. ZHANG Jingliang, ZHAO Shanlin, ZHAO Rongxiang, et al. Research on modern CO₂ absorption process[J]. Contemporary Chemical Industry, 2011, 40(1):88-91.
[9] 李光彬, 赖新春, 向茂乔, 等. 铬-铝氧化物复合阻氚涂层的制备工艺研究[J]. 粉末冶金技术, 2017, 35(5):1-7. LI Guangbin, LAI Xinchun, XIANG Maoqiao, et al. Study on preparation process of chromium-aluminum oxide composites tritium permeation barrier[J]. Powder Metallurgy Technology, 2017, 35(5):1-7.
[10] 汪琦, 俞红啸, 张慧芬. 熔盐反应堆核能中熔盐系统的研究[J]. 化工装备技术, 2015, 34(6):6-33. WANG Qi, YU Hongxiao, ZHANG Huifen. Study on molten salt circulation system in the reactor of nuclear power generation[J]. Chemical Equipment Technology, 2015, 34(6):6-33.
[11] ZAVOICO A B. Solar power tower design basis docume-nt[R]. Sandia National Laboratories, 2001:doi:10.2172/786629.
[12] Brenntag Company. Hitee heat transfer salt:Gttp://www.sokyscrubber.com/MSR%20-%20HITEC%20Heat%20Transfer%20Salt.polf. Houston:Coasrtal Chemical Co, LLC, 1-10.
[13] 杜宝强, 王怀有, 李锦丽, 等. 氯离子对Solar Salt熔盐热物性的影响及结果分析[J]. 应用化工, 2017, 46(6):1086-1092. DU Baoqiang, WANG Huaiyou, LI Jinli, et al. Influence of Cl-on thermal stability of solar salt mixed molten salts[J]. Applied Chemical Industry, 2017, 46(6):1086-1092.
[14] 程进辉. 传蓄热熔盐的热物性研究[D]. 上海:中国科学院大学, 2014. CHENG Jinhui. Study on molten salt thermophysical properties for heat transfer and storage[D]. Shanghai:Chinese Academy of Sciences, 2014.
[15] ROGRT F, FAVOTTO C, ROGEZ J. Study of the KNO₃-LiNO₃ and KNO₃-NaNO₃-LiNO₃ eutectics as phase change materials for thermal storage in a low-temperature solar power plan[J]. Solar Enengy, 2013, 95(6):155-169.
[16] 胡宝华, 丁静, 魏小兰, 等. 高温熔盐的热物性测试及热稳定性分析[J]. 无机盐工业, 2010, 42(1):22-26. HU Baohua, DING Jing, WEI Xiaolan, et al. Test of thermal physics and analysis on thermal stability of high temperature molten salt[J]. Inorganic chemicals industry, 2010, 42(1):22-26.
[17] KEARNEY D, KELL B Y. Assessment of a molten heat transfer fluid in a parabolic trough solar field[J]. Solar Energy Engineering, 2003, 125(1):170-176.
[18] 王超, 任楠, 吴玉庭, 等. 新型低熔点混合熔盐的开发及热物性测定[J]. 太阳能学报, 2015, 36(11):2605-2608. WANG Chao, REN Nan, WU Yuting, et al. Development of a new low melting point mixed molten salt and determination of thermal properties[J]. Journal of Solar Energy, 2015, 36(11):2605-2608.
[19] 李鹏, 李彦, 朱群志. 二元混合熔盐的制备及热物性研究[J]. 上海电力学院学报, 2016, 32(2):126-131. LI Peng, LI Yan, ZHU Qunzhi. Preparation and thermal properties of binary mixed molten salts[J]. Journal of Shanghai University Electric Power, 2016, 32(2):126-131.
[20] 刘风国. NaNO₂-KNO₃-NaNO₃三元熔盐体系物理化学性质与结构的研究[D]. 沈阳:东北大学, 2011. LIU Fengguo. Study on physical and chemical properties and structure of NaNO₂-KNO₃-NaNO₃ ternary molten salt system[D]. Shenyang:Northeastern University, 2011.
[21] 任楠. 混合熔盐传热蓄热介质的制备与热物性研究[D]. 北京:北京工业大学, 2014. REN Nan. Preparation and thermophysical properties of mixed molten salt heat storage medium[D]. Beijing:Beijing University of Technology, 2014.
[22] 张璐迪. 纳米SiO₂-熔盐复合储热材料的制备与热物性实验研究[D]. 北京:北京工业大学, 2015. ZHANG Ludi. Preparation and thermal properties of nano SiO₂-molten salt composite heat storage materials[D]. Beijing:Beijing University of Technology, 2015.
[23] 史建峰. 混合溴化盐的配制及热物性实验研究[D]. 北京:北京建筑大学, 2015. SHI Jianfeng. Preparation and experimental study on thermal properties of mixed bromide salts[D]. Beijing:Beijing University of Civil Engineering and Architecture, 2015.
[24] 李英. 低熔点二元混合熔盐传热蓄热介质的制备及热物性研究[D]. 北京:北京工业大学, 2017. LI Ying. Preparation and thermophysical properties of low melting point two element mixed molten salt heat storage medium[D]. Beijing:Beijing University of Technology, 2017.
[25] 杜宝强, 王怀有, 李锦丽, 等. 面向太阳能光热发电的NaNO₃-KNO₃-Mg(NO₃)₂三元硝酸熔盐[J]. 材料导报, 2017, 31(9):1-6. DU Baoqiang, WANG Huaiyou, LI Jinli, et al. A NaNO₃-KNO₃-Mg(NO₃)₂ molten nitrate salt used for solar thermal power generation[J]. Materials Review, 2017, 31(9):1-6.
[26] GIL A. State of the art on high temperature thermal energy storage for power generation. Part 1-Concepts, materials and modellization[J]. Renewable and Sustainable Energy Reviews, 2010, 14(1):31-55.