面向太阳能光热发电的NaNO_3-KNO_3-Mg(NO_3)_2三元硝酸熔盐  

A NaNO_3-KNO_3-Mg(NO_3)_2 Molten Nitrate Salt Used for Solar Thermal Power Generation

作　　者：杜宝强[1,2] 王怀有 李锦丽[1,3] 赵有璟[1,3] 杨红军 钟远[1,3] 王敏[1,3] DU Baoqiang WANG Huaiyou LI Jinli ZHAO Youjing YANG Hongjun ZHONG Yuan WANG Min(Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008 University of Chinese Academy of Sciences, Beijing 100049 Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008)

机构地区：[1]中国科学院青海盐湖研究所,西宁810008 [2]中国科学院大学,北京100049 [3]中国科学院青海盐湖研究所中国科学院盐湖资源与化学重点实验室,西宁810008

出　　处：《材料导报》2017年第18期1-4,共4页Materials Reports

基　　金：青海省自然科学基金(2014-ZJ-909);国家自然科学基金青年项目(21601197)

摘　　要：Solar Salt(60%NaNO_3-40%KNO_3)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(NO_3)2·6H_2O制备了低熔点NaNO_3-KNO_3-Mg(NO_3)_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%NaNO_3-33%KNO_3-17.5%Mg(NO_3)_2。与Solar Salt和HTS(53%KNO_3-40%NaNO_2-7%NaNO_3)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。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.

关 键 词：太阳能光热发电 硝酸熔盐 热物性 低熔点 差示扫描量热 六水合硝酸镁 

分 类 号：TQ13[化学工程—无机化工]