硝酸钙与硝酸钠二元相变蓄热材料的制备与性能  

Preparation and experimental study on Ca(NO_3)_2-NaNO_3 eutectics for latent heat storage

作　　者：纪育楠 赵长颖[1] 徐治国[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240

出　　处：《化工进展》2014年第A01期228-232,共5页Chemical Industry and Engineering Progress

基　　金：国家973计划项目(2013CB228303)

摘　　要：相变蓄热技术是解决热能供需矛盾的有效手段。为了得到一种廉价的中温相变蓄热材料,该文将硝酸钙和硝酸钠按摩尔比从1∶9到9∶1配比出9个样本,通过同步热分析仪测试,发现3∶7为最佳比例。经过27次吸热放热循环,该配比的混合盐相变点和相变焓基本保持稳定,其融化潜热为135.8kJ/kg,熔点为217.4℃,且无明显的质量变化。并对该熔融盐的比热容和腐蚀性进行了测试。该混合盐腐蚀性小,与不锈钢和铝合金具有良好的相容性。通过和相变蓄热能力相当的solar salt进行比较,发现其成本只有后者的一半左右,说明该配比的混合盐性价比高,在相变蓄热具有良好的应用前景。Latent heat storage is considered as a more efficient solution to the mismatch between heat supply and demand.In this study,calcium nitrate and sodium nitrate is mixed in molar ratios from 1 ∶ 9 to 9 ∶ 1 so as to form a cheap phase change material for latent heat storage,and the one in the ratio of 3 ∶ 7 is considered as the optimum proportion for its considerable heat of fusion and better exothermic performance.Its melting point and heat of fusion are 135.8kJ/kg and 217.4℃ respeclively.After melting and freezing cycle test,no obvious mass change of the 3 ∶ 7 eutectic is observed.Its Heat capacity is measured.It also has a good compatibility with stainless steel 201,304,316L and aluminum alloy 1060.The cost is only about half of solar salt,which has the latent heat storage capacity similar to the 3 ∶ 7 eutectic.It means that the sodium nitrate and calcium nitrate eutectics may have a good application polential in latent heat storage.

关 键 词：相变材料 硝酸钙 硝酸钠 循环稳定性 腐蚀性 

分 类 号：TQ131.12[化学工程—无机化工]