新型三元氯化物熔盐材料的设计及热稳定性研究  

Thermal Stability of a New Designed Ternary Chloride Molten Salt Material

作　　者：宋明[1] 魏小兰[1] 彭强[2] 丁静[3] 杨建平[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640 [2]广东药学院化学与化工学院,中山528458 [3]中山大学工学院,广州510006

出　　处：《工程热物理学报》2015年第2期393-396,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376067);中国博士后科学基金资助项目(No.2013M531847);国家重点基础研究发展计划资助(No.2010CB227103)

摘　　要：为了满足规模化太阳能热发电高温传热蓄热和工业余热回收利用的要求,分析并设计了NaCl-CaCl_2-MgCl_2三元熔盐体系作为传热蓄热介质。在已有的二元相图的基础上通过共形离子溶液(conformal ionic solution,CIS)模型模拟计算获得计算相图,根据计算相图所预测的低共熔点配比制样,采用热重差热联用分析仪(TG-DSC)对样品的熔点、相变潜热进行了表征,采用高温静态法对熔盐的稳定性进行了初步分析。结果表明:计算相图预测的低共熔点(424℃)与测试结果(428.5℃)基本一致,该熔盐相变潜热高达到191.7 J/g,熔盐在低于600℃下较稳定,适合作为高温潜热蓄热材料。研究为氯化物熔盐相图和热物性提供了宝贵的数据。In order to meet the large-scale solar thermal power generation and the recycling of industrial waste heat.A new ternary eutectic mixture consisted of sodium chloride calcium chloride and magnesium chloride was designed.According to the existing experimental binary phase diagrams,phase diagram of the new ternary system was calculated by using conformal ionic solution(CIS)theory.The ternary eutectic mixture was prepared based on the predicted eutectic composition.Then the eutectic point and latent heat of the salt mixture were tested by the Thermo gravimetric analysis and Differential Scanning Calorimeter(TG-DSC).Thermal stability of the molten salt was determined under isothermal conditions.The result shows that the experimental melting point was 428.5℃which was in good agreement with that of the predicted value 424℃ The latent heat of melting for molten salt was super high 191.7 J/g.Mass loss curves under isothermal conditions showed that the ternary eutectic salt mixture had good thermal stability under 600℃ and was suitable to be a latent heat storage material.This research provided valuable data on the study of chloride molten salt.

关 键 词：三元熔盐 相图 潜热 热稳定性 

分 类 号：O642.5[理学—物理化学] TQ124.42[理学—化学]