摘要 针对塑料换热管传热性能不佳的问题,采用界面聚合法,以间苯二胺(MPD)为水相单体,均苯三甲酰氯(TMC)为有机相单体,对聚丙烯(PP)中空纤维换热管疏水性外表面进行局部亲水性改性,以形成呈"孤岛"分布的亲水性聚酰胺层,从而构建蒸汽冷凝用亲-疏水性组合表面。在此基础上,研究改性PP换热管强化蒸汽冷凝传热效果。换热管改性后,蒸汽冷凝总传热系数K高达2 295 W/(m2·K),较未改性前提高了87.29%。可见,PP中空纤维换热管外表面界面聚合改性,能够显著强化蒸汽冷凝传热性能。 In order to solve the problem of poor heat transfer performance of plastic heat exchange tubes,the hydrophilic modification in partial on hydrophobic outer surface of polypropylene(PP) hollow fiber heat exchange tubes were carried out by interfacial polymerization method with mphenylenediamine(MPD) as aqueous phase monomer,and trimesoyl chloride(TMC) as organic phase monomer,so as to form a hydrophilic polyamide layer with ’island’ distribution,and construct a hydrophilic-hydrophobic combination surface for steam condensation.On this basis,the heat transfer enhancement of modified PP heat exchange tubes was studied.The results showed that the coefficient K of total steam condensation heat transfer after modification was as high as 2 295 W/(m2·K),which was increased by 87.29% compared with that before modification.It is thus obvious that the performance of steam condensation heat transfer can be enhanced by interfacial polymerization modification on outer surface of PP hollow fiber heat exchange tubes.
出处 《水处理技术》 CAS CSCD 北大核心 2021年第4期24-29,共6页 Technology of Water Treatment
基金 天津市科技支撑计划重点项目(15ZCZDSF00070) 天津市自然科学基金项目(17JCYBJC17400)。
关键词 聚丙烯 中空纤维换热管 表面改性 亲-疏水表面 蒸汽冷凝 传热 海水淡化 polypropylene hollow fiber heat exchange tubes surface modification hydrophilic-hydrophobic surface vapor condensation heat transfer desalination
