石墨烯改性的氟塑料热交换器换热性能研究  

Heat Transfer Performance Study of Graphene-modified Fluoroplastic Heat Exchangers

作　　者：孙巧群[1] 李一淳 邓跃军 董鹤鸣[2] 刘文斌 杜谦[2] 高建民[2] SUN Qiao-qun;LI Yi-chun;DENG Yao-jun;DONG He-ming;LIU Wen-bin;DU Qian;GAO Jian-min(College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Harbin Property Heating Group Co.,Ltd.,Harbin 150010,China)

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001 [2]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [3]哈尔滨物业供热集团有限责任公司,黑龙江哈尔滨150010

出　　处：《节能技术》2023年第2期117-124,共8页Energy Conservation Technology

基　　金：国家重点研发课题(复杂条件能效排放关键参量测量与计量技术研究,2021YFF0600602)。

摘　　要：工业上燃料燃烧产生的低温烟气余热资源丰富但存在回收困难及低温腐蚀等问题。聚四氟乙烯(PTFE)具有耐酸腐蚀、重量轻、表面能低及适用温度范围广等优势,已被应用于制造低温烟气余热回收利用的传热管。然而其导热性能有限,为提高PTFE导热性能,本文研究了添加石墨烯对PTFE性能的影响,通过添加5wt%的石墨烯完成了PTFE的改性使其导热性能提高18.68%;通过数值模拟计算研究发现,添加石墨烯后换热性能提高5.62%;利用模拟优化掌握在混气条件下热换热器总换热系数相较于平均对流换热系数最高提升~50%,添加石墨烯改性后总换热系数最高提升8.3%。该研究对于我国低温烟气余热回收、节能降耗具有重要的意义,同时也为聚合物热交换器的设计提供参考。The industry s low-temperature flue gas waste heat resources generated by fuel combustion are abundant.However,there are problems,such as difficulties in waste heat recovery and low-temperature corrosion.Polytetrafluoroethylene(PTFE)among polymers has the advantages of acid corrosion resistance,lightweight,low surface energy,and a wide range of applicable temperatures.It has been used to manufacture heat transfer tubes for low-temperature flue gas waste heat recovery and utilization.However,its thermal conductivity is limited.In order to improve the thermal conductivity of PTFE,this paper studied the effect of adding graphene on the performance of PTFE by adding five wt%of graphene to complete the modification of PTFE to improve its thermal conductivity by 18.68%;through numerical simulation calculation study found that the addition of graphene heat exchange heat transfer performance increased by 5.62%;using experimental-simulation hybrid optimization to master The total heat transfer coefficient of the heat exchanger under mixed gas conditions is improved by up to~50%compared to the average convective heat transfer coefficient.The total heat transfer coefficient is improved by up to 8.3%after adding graphene modification.The study is significant for low-temperature flue gas waste heat recovery,energy saving,and consumption reduction in China.Also,it provides a reference for the design of polymer heat exchangers.

关 键 词：石墨烯 改性 聚四氟乙烯 热交换器 换热性能 

分 类 号：TK011[动力工程及工程热物理]