Preparation and characterization of modified natural graphite/molten salt composite
Duan Chunting1,2, Liu Junqing1, Xu Wenqiang1, Zheng Dongfang1, Wang Qiushi1Liang Peng1, Song Huaihe2
1.National Institute of Clean-and-Low-Carbon Energy,Beijing 102211; 2.College of Material Science and Engineering,Beijing University of Chemical Technology,Beijing 100029
Abstract: Molten salt is an ideal medium for heat transfer and storage in solar thermal power generation industry.In order to increase thermal conductivity of molten salt,modified natural graphite was used as a thermal conductive filler to prepare molten salt (NaNO3-7%-NaNO2-40%-KNO3-53%) composite.The modified natural graphite-molten salt composite was characterized by SEM,DSC,laser thermal conducting instrument and thermal infrared imager.Surface modification improved the interfacial compatibility of natural graphite and molten salt.Modified natural graphite dispersed better in molten salt than natural graphite.The composite had good thermal stability,but the melting enthalpy,melting point and specific heat capacity were lower than original salt.Adding 25g modified natural graphite to 100g molten salt,the thermal conductivity was increased from 0.76W/(m·K) to 11.3W/(m·K).The results indicated that modified natural graphite can effectively improve the thermal conductivity of molten salt.This method can improve heat transfer and heat storage efficiency in solar thermal power generation industry.The specific heat capacity of molten salt composite was reduced caused by the additive,so it was necessary to choose the optimized dosage in practical applications.
段春婷, 刘均庆, 徐文强, 郑冬芳, 王秋实, 梁朋, 宋怀河. 改性天然石墨/熔盐复合材料的制备及性能分析[J]. 化工新型材料, 2018, 46(11): 80-83.
Duan Chunting, Liu Junqing, Xu Wenqiang, Zheng Dongfang, Wang QiushiLiang Peng, Song Huaihe. Preparation and characterization of modified natural graphite/molten salt composite. New Chemical Materials, 2018, 46(11): 80-83.
2018, Vol. 46 
