纳米二氧化硅改性石蜡相变乳液的制备及其性能研究  

Preparation and properties of paraffin phase change emulsions modified by nano-silica

作　　者：肖一啸 李爱蓉[1] 陈薇 吴丹 李林辉 张子晴 Xiao Yixiao;Li Airong;Chen Wei;Wu Dan;Li Linhui;Zhang Ziqing(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500)

机构地区：[1]西南石油大学化学化工学院,成都610500

出　　处：《化工新型材料》2024年第10期118-125,共8页New Chemical Materials

基　　金：四川省产教融合示范项目(川财教[2022]106号)。

摘　　要：相变乳液作为一种新型的储热工质,可用于太阳能的高效集热,但使用过程中存在乳液导热性差、光热转换效率低等问题。以石蜡相变乳液(PCME)为研究对象,系统地考察了乳化剂种类、亲水亲油平衡值(HLB值)、乳化剂含量对PCME性能的影响;同时,通过向PCME中添加气相纳米二氧化硅(纳米SiO_(2))作为改性材料,考察其对提高乳液导热性的影响,并搭建了模拟太阳能集热装置测试相变乳液的集热性能。结果表明:当乳化剂为司班60/吐温80、HLB值为12、质量分数选用4%时,所制备出的乳液性能较好;当向该乳液中添加0.3%纳米SiO_(2)时,改性后的SiO_(2)/PCME导热系数由原乳液的0.2750W/(m·K)提高至0.3892W/(m·K),其光热转换效率与纯水相比提高了24.73%,与SiO_(2)纳米流体相比提高了17.14%。As a new thermal storage working medium,phase change emulsion can be used for efficient solar energy heat collection,but there still are some problems such as poor thermal conductivity of emulsion and low photothermal conversion efficiency.Taking paraffin phase change emulsion(PCME)as the research subject,the effects of emulsifier type,hydrophilic-lipophilic balance(HLB)value,and emulsifier content on the properties of PCME were investigated systematically in this work.Meanwhile,Nano-SiO_(2)was employed as a modified material and was added into PCME.The effect of nano-SiO_(2)on improving thermal conductivity of PCME emulsion was investigated,and a simulated solar collector was built to test the thermal collection performance of different phase change emulsions.When the emulsifier was Span 60/Tween 80,HLB was 12,and the mass fraction was selected as 4%,the properties of the prepared emulsion was better.When 0.3wt%nano-SiO_(2)was added into the emulsion,the thermal conductivity of the modified SiO_(2)/PCME was increased from 0.2750W/(m·K)of the original emulsion to 0.3892W/(m·K),and the photothermal conversion efficiency was improved by 24.73%compared with pure water and by 17.14%compared with SiO_(2)nanofluid.

关 键 词：纳米二氧化硅 相变乳液 导热系数 集热性能 

分 类 号：TB34[一般工业技术—材料科学与工程] TK124[动力工程及工程热物理—工程热物理]