甘露糖醇相变储热材料的制备及传热性能  

Preparation and heat transfer properties of mannitol phase change heat storage materials

作　　者：陈琰 王金书 白金刚 郭智文 吕喜风 CHEN Yan;WANG Jinshu;BAI Jingang;GUO Zhiwen;LYU Xifeng(College of Chemistry and Chemical Engineering,Tarim University,Alar 843300,Xinjiang,China;College of Energy and Power,Bingtuan Xingxin Vocational and Technical College,Tiemenguan 841007,Xinjiang,China)

机构地区：[1]塔里木大学化学化工学院,新疆阿拉尔843300 [2]新疆生产建设兵团兴新职业技术学院能源与动力学院,新疆铁门关841007

出　　处：《精细化工》2024年第12期2622-2628,2784,共8页Fine Chemicals

基　　金：大学生创新创业项目(2023062);有机无机复合材料国家重点实验室开放课题(oic-202001011)。

摘　　要：为提升中温相变储能材料(PCM)甘露糖醇(Man)的封装效果,以氧化石墨烯(GO)为支撑骨架原位生长沸石咪唑酯骨架结构材料(ZIF),通过高温煅烧构筑了碳载体(PC),采用浸渍法对Man进行封装制备了复合相变材料PC/Man。采用SEM、XPS、N_(2)吸附-脱附、DSC对PC/Man的形貌和性能进行了测试,评价了其导热性和渗透性。采用Fluent软件模拟了管式换热器中储热材料的凝固过程,探讨了温度和液相率与时间的关系。结果表明,PC兼具微介孔和大孔的多级孔结构,较大的比表面积(249.7 m^(2)/g)、孔体积(0.15 cm^(3)/g)、平均孔径(约14 nm)对Man产生较强的吸附作用,减少了Man的渗漏。PC/Man加热至180℃后,30 min内PC/Man的质量损失为1.03%;PC/Man的吸热焓达185.3 J/g,导热系数为0.8306 W/(m·K),PC形成的高导热通道实现了Man快速有效的热能释放。PC/Man凝固换热周期为40 min,具有较高的放热效率和良好的热传导性,能实现热量的快速交换。In order to improve the encapsulation effect of mannitol (Man) which is a medium temperature phase change energy storage material (PCM),carbon carrier (PC) was constructed by high temperature calcination with in situ growth of zeolite imidazolate framework (ZIF) on graphene oxide (GO) support skeleton,and then used for encapsulation of Man via impregnating method to synthesize a composite phase change material PC/Man.PC/Man obtained were characterized and analyzed by SEM,XPS,N_2adsorption-desorption and DSC,followed by evaluation on its thermal conductivity and permeability.The solidification process of heat storage materials in tubular heat exchangers was simulated by Fluent software,with the relationship among temperature,liquid rate and time further discussed.The results revealed that PC exhibited a multistage pore structure with both mesopores and macropores,with a large specific surface area (249.7 m^(2)/g),pore volume (0.15 cm^(3)/g) and average pore size (about 14 nm) showing strong adsorption effect on Man,thus mitigating the leakage of Man.When heated to 180℃,the PC/Man exhibited a mass loss within 30 min of 1.03%,a heat absorption enthalpy of 185.3 J/g,and a thermal conductivity of 0.8306 W/(m·K).The high thermal conductivity channel formed by PC enhanced the rapid and effective heat release of Man.The solidification heat transfer cycle of PC/Man was 40 min,showing high heat release efficiency and good thermal conductivity,which led to rapid heat exchange.

关 键 词：原位生长 相变材料 中温储热 传热模拟 甘露糖醇 功能材料 

分 类 号：TB34[一般工业技术—材料科学与工程]