摘要
为满足太阳能高温传热、蓄热的要求,根据碳酸盐的相图数据,利用静态熔融的方法制备了碳酸钠-碳酸钾新型熔盐,并对熔盐添加氯化钠、氯化钾、碳酸锂等高熔点物质进行改性,采用差式扫描量热法(DSC)、重量法、电位滴定法和热循环法对混合熔盐的熔点、相变潜热、离子变化、热稳定性等热力学性质进行了表征。实验结果表明,碳酸锂改性后的碳酸熔盐熔点和相变潜热数据较氯化钠、氯化钾改性的优越,但价格较贵,不适合作为太阳能高温传热介质;价格较低的氯化钠改性后的碳酸熔盐具有熔点比二元碳酸熔盐低133℃、相变潜热增加为二元碳酸熔盐的1.9倍和在850℃以下热稳定性好的特点,是一种比较理想的高温热载体。
To meet the requirement of high temperature of solar heat transfer and thermal storage, a new type of Na2CO3 - K2CO3 molten salt was prepared by static fusion method according to the phase diagram data of carbonate. It was modified by high melting point additives, such as NaCl, KCl, and Li2CO3. Thermal properities such as the melting point, phase transition latent heat, ion change, and thermal stability of the mixed molten salts were characterized by thermal gravimetric and differential thermal analysis, gravimetric method, potentiometric titration method gand thermal circulation method. Experimental results showed that the modified carbonate molten salt with Li2CO3 had better melting point and phase transition latent heat data than that with NaCl and KCl, but the cost was high. Therefore, it was not suitable to be the solar heat transfer medium. The carbonate molten salt modified by low - cost NaCl is a perfect high - temperature carrier, whose melting point was 133 ℃ lower than that of binary carbonate salt,phase transition latent heat was 1.9 times as large as binary carbonate salt and thermal stability was good under the temperature of 850 ℃.
出处
《无机盐工业》
CAS
北大核心
2008年第10期15-17,共3页
Inorganic Chemicals Industry
基金
国家高技术研究发展计划项目(2004AA516010)
广东重点科技项目(2004B40401006)
关键词
太阳能
传热蓄热
碳酸熔盐
solar energy
heat transfer and thermal storage
carbonate molten salt
