石墨烯-PFA复合材料换热器与金属换热器的传热性能对比  

Comparison of heat transfer performance between graphene-PFA composite material heat exchanger and metal heat exchanger

作　　者：梁佳鹏 左海滨 张万龙 刘迎立 LIANG Jiapeng;ZUO Haibin;ZHANG Wanlong;LIU Yingli(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《热科学与技术》2022年第1期51-56,共6页Journal of Thermal Science and Technology

基　　金：国家重点研发计划资助项目(2016YFB0600701)。

摘　　要：氟塑料换热器以其耐腐蚀、耐磨损等优点而备受关注,但氟塑料热导率较低,换热能力差,限制了其广泛应用。石墨烯-PFA复合材料兼具石墨烯优异的导热性和可熔性聚四氟乙烯(PFA)良好的耐酸碱腐蚀性,是新一代的换热器材料。搭建了余热回收测试实验台,对石墨烯-PFA复合材料换热器和金属换热器的传热性能进行对比。研究了不同烟气流速、不同进口烟气温度以及不同石墨烯配比对复合材料传热性能的影响。结果表明:对于金属换热器和复合材料换热器,当烟气流速从2.0增加到4.0 m/s时,传热系数分别增加到原来的1.19和1.34倍;随着进口烟温的升高,两种材质的传热系数分别降低了15.6%和14.7%;随着石墨烯含量增加,复合材料的导热系数以及传热系数均增加。Fluoroplastic heat exchangers have attracted much attention due to their corrosion resistance and wear resistance, but the lower thermal conductivity of fluoroplastics contributes to a weak heat exchanging capacity, limiting the application of this heat exchangers. The graphene-PFA composite material has both excellent thermal conductivity of graphene and good acid and alkali corrosion resistance of fusible polytetrafluoroethylene(PFA), and it will become the new material of heat exchanger. A waste heat recovery test bench was built to compare the heat transfer performance of graphene-PFA composite material heat exchangers and metal heat exchangers. The effects of flue gas flow rate, inlet flue temperature and graphene ratio on the heat transfer performance of the composites were investigated. The results show that when the flue gas flow rate increases from 2.0 to 4.0 m/s, the heat transfer coefficient increases to 1.19 and 1.34 times for the metal heat exchanger and the composite heat exchanger respectively. With the increase of the inlet temperature of exhausted gas, the heat transfer coefficients of the two exchangers decrease by 15.6% and 14.7%, respectively. Improving the graphene content in PFA, both the thermal conductivity of the composite and the heat transfer coefficient increase.

关 键 词：氟塑料换热器 金属换热器 传热系数 烟气流速 烟气温度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]