摘要
为满足聚光太阳能热发电和高温太阳能热化学中对高温的要求,选择了应用在太阳能传热蓄热系统中的具有使用范围广,性质稳定的氯化钠、氯化镁和氯化钾的混合盐,配置了36种不同配比的混合氯化熔盐,采用差示扫描量热仪(DSC)测定了不同配比熔盐的熔点,结果表明:36种混合熔盐的熔点集中在36种混合盐的熔点都分布在400℃和460℃附近;在此基础上测定了熔点在400℃附近的11种不同配比熔盐的比热,并进行了蓄热成本分析,结果表明,当氯化镁、氯化钠和氯化钾的质量比为2:7:1时,蓄热成本最低,是最佳的传热蓄热介质。最后采用最小二乘法得到了这种混合盐在熔融状态下比热与温度的回规方程。
In order to satisfy the requirement of high temperature in the CSP（Concentrating Solar Power ） and solar chemistry industry, we choose the mixture of Magnesium Chloride, Sodium Chloride and Potassium Chloride, which are stable and extensively applied in heat transfer and heat storage system of CSP. Thirty six kinds of mixed salts with different weight ratios of the three chloride salts were prepared. Melting point and specific heat of these 36 kinds of salts have been measured with DSC（differential scanning calorimeter）. The results showed that the melting points of these salts are in the range 400℃ and 465℃. The weight ratio of the mixture, which can be used as the high temperature heat storage materi- als with the lowest thermal storage cost, is 2（MgCl2 ）：7（NaC1）： 1 （KCI）. The equation for calculating the capacities was derived as well.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2008年第9期1092-1095,共4页
Acta Energiae Solaris Sinica
基金
国家重点技术研究发展计划(973)项目(No.2003CB214505)
关键词
太阳能
熔盐
比热
熔点
蓄热
solar energy
molten salt
specific heat
melting point
heat storage
