A NaNO3-KNO3-Mg(NO3)2 Molten Nitrate Salt Used for Solar Thermal Power Generation
DU Baoqiang1,2, WANG Huaiyou1,3, LI Jinli1,3, ZHAO Youjing1,3, YANG Hongjun1,3, ZHONG Yuan1,3, WANG Min1,3
1 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008; 2 University of Chinese Academy of Sciences, Beijing 100049; 3 Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008
摘要 Solar Salt(60%NaNO3-40%KNO3)熔盐作为传蓄热介质,在太阳能光热发电领域应用广泛。以Solar Salt熔盐为基础,采用熔融共混法,通过添加Mg(NO3)2·6H2O制备了低熔点NaNO3-KNO3-Mg(NO3)2三元熔盐(NKM熔盐),优化了制备工艺,获得了最佳工艺参数及条件,获得了三元熔盐热物性变化规律。通过热物性分析,确定NKM熔盐配比为49.5%NaNO3-33%KNO3-17.5%Mg(NO3)2。与Solar Salt和HTS(53%KNO3-40%NaNO2-7%NaNO3)熔盐相比,NKM熔盐具有较低的熔点和良好的温度使用范围,黏度较小,储热性和导热性良好,适合作为中温储能材料应用于光热发电。
Abstract: Solar Salt (60%NaNO3-40%KNO3) is widely used in solar thermal power generation as heat storage medium. NaNO3-KNO3-Mg(NO3)2 (NKM) ternary molten salt was obtained in this work through adding magnesium nitrate in Solar Salt molten salt, and a subsequent melt-blending process. The process parameters and conditions were optimized, and thermophysical properties of NKM ternary molten salt were obtained. The optimized composition of NKM ternary molten salt was 49.5%NaNO3-33%KNO3-17.5%Mg(NO3)2. Compared with HTS (53%KNO3-40%NaNO2-7%NaNO3) and Solar Salt, NKM ternary molten salt showed lower melting point and viscosity, higher density, better heat capacity and thermal conductivity, which indicated an application prospect as a promising candidate of medium temperature energy storage material for solar thermal power generation.
杜宝强, 王怀有, 李锦丽, 赵有璟, 杨红军, 钟远, 王敏. 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》期刊社, 2017, 31(18): 1-4.
DU Baoqiang, WANG Huaiyou, LI Jinli, ZHAO Youjing, YANG Hongjun, ZHONG Yuan, WANG Min. A NaNO3-KNO3-Mg(NO3)2 Molten Nitrate Salt Used for Solar Thermal Power Generation. Materials Reports, 2017, 31(18): 1-4.
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2017, Vol. 31 
