| 制备方法对纳米熔盐储热性能及形成机理的影响 |
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| 引用本文： | 熊亚选,钱向瑶,李烁,孙明远,王振宇,吴玉庭,徐鹏,丁玉龙,马重芳.制备方法对纳米熔盐储热性能及形成机理的影响[J].化工学报,2021,72(5):2857-2868. |
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| 作者姓名： | 熊亚选 钱向瑶 李烁 孙明远 王振宇 吴玉庭 徐鹏 丁玉龙 马重芳 |
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| 作者单位： | 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，北京 100124;3.伯明翰大学伯明翰储能中心，英国 伯明翰 B15 2TT |
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| 基金项目： | 北京市教委科研计划项目(KM201910016011);北京市自然科学基金重点项目(3151001) |
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| 摘 要： | 纳米材料能够改善高温熔盐的传热储热性能，提升大规模储热系统的储热和热交换效率，但目前仍未找到纳米熔盐的高效大规模制备方法。为优选纳米熔盐的高效大规模制备方法，以二元混合盐为基盐，采用高温熔融法和水溶液法分别制备纳米熔盐，用差示扫描量热法、热重分析法和微观形貌分析法，研究制备方法对纳米熔盐显热和储热性能提升、微观结构的影响，探索纳米熔盐形成机理。结果表明，两种制备方法均在搅拌90 min时制备的纳米熔盐性能达到最优，且高温熔融法制备纳米熔盐的熔化潜热和比热容分别比水溶液法高2.6%和28.18%；两种方法制备纳米熔盐的熔点较小，但对纳米熔盐的微观形貌存在明显影响，云核的形成与结构影响着纳米熔盐的储热性能。相比水溶液法，高温熔融法工艺简单，过程能耗低，纳米熔盐储热性能更好，适用于纳米熔盐的大规模生产和工程应用。
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| 关 键 词： | 纳米熔盐 大规模生产 高温熔融法 水溶液法 云核 储热 |
| 收稿时间： | 2020-10-09 |
Effect of preparation methods on thermal energy storage performance and formation mechanism of molten salt nanofluids |
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| XIONG Yaxuan,QIAN Xiangyao,LI Shuo,SUN Mingyuan,WANG Zhenyu,WU Yuting,XU Peng,DING Yulong,MA Chongfang.Effect of preparation methods on thermal energy storage performance and formation mechanism of molten salt nanofluids[J].Journal of Chemical Industry and Engineering(China),2021,72(5):2857-2868. |
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| Authors: | XIONG Yaxuan QIAN Xiangyao LI Shuo SUN Mingyuan WANG Zhenyu WU Yuting XU Peng DING Yulong MA Chongfang |
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| Affiliation: | 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, Ministry of Education, Beijing University of Technology, Beijing 100124, China;3.Birmingham Center for Energy Storage, University of Birmingham, Birmingham B15 2TT, UK |
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| Abstract: | Nanomaterials could improve the heat transfer and thermal heat storage performance of molten salts and further increase the efficiency of heat transfer and thermal heat storage systems greatly. To find efficient method for large-scale production of molten salt nanofluids, both the high-temperature melting method and the aqueous solution method were employed to prepare molten salt nanofluids by adding SiO2 nanoparticles to a binary nitrate salt. Then, methods of differential scanning calorimetry, thermogravimetric analysis and micromorphology analysis were used to investigate the enhancement of latent heat and sensible heat, change of micromorphology of molten salt nanofluids prepared by the two methods. Results show that molten salt nanofluids with optimal performance were observed under the mixing time of 90 minutes for both preparation methods when heat of fusion and specific heat of molten salt nanofluid prepared by the high-temperature melting method are 2.6% and 28.18% higher than those by the aqueous solution method; Effect of preparation methods on melting point is weak but is apparent on micromorphology of molten salt nanofluids. Formation process and structure of cloud nuclei determine the thermal storage performance of molten salt nanofluids. In addition, preparation process of the high-temperature melting method is simple and energy-saving, which is suitable for large-scale production and engineering application of molten salt nanofluids. |
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| Keywords: | molten salt nanofluid large-scale production high-temperature melting method aqueous solution method cloud nuclei thermal energy storage |
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