石墨改性聚全氟乙丙烯导热中空纤维及其换热器的研制

Study of FEP/G-Based Heat Conductive Hollow Fiber and Its Heat Exchanger

塑料换热器在化工废水处理、酸碱盐循环设备等特殊领域具有重大应用价值,近年来得到了极大的发展。为提高换热器的整体换热效果,提高塑料换热器的最高使用温度,采用石墨作为填料,对聚全氟乙丙烯进行填充改性,以此制备出管壁薄、管径小且导热性能优良的复合材料导热中空纤维,将其加工后制作成换热器。重点探讨了石墨添加量及工艺加工条件对中空纤维物化性能的影响规律,并且通过冷热流体流程的变换及流量的改变研究其对自制的换热器总体换热性能的影响及规律。结果表明,利用石墨改性聚全氟乙丙烯复合导热材料制作的中空纤维换热器,价格低廉、体积小质量轻、单位体积换热系数较高且换热性能优异。

Common heat exchangers can not meet the demands of some special areas,such as waste-water treatment of chemical industry,acid and alkali salt circulation equipment.Therefore,there is a great value of the application of plastic heat exchanger and it has been greatly developed in recent years.In order to improve the overall efficiency of heat exchanger and the maximum service temperature of the plastic heat exchanger,graphite is used as filler and the FEP was mollified with it.In this paper,we make the hollow fiber by composite material with small diameter,thin wall and good thermal conductivity.And the heat exchangers were made by the heat conductive hollow fibers.This paper mainly discussed the formula of the composite material and the influences of preparation process on hollow fibers＇ mechanism and thermal properties.Testing of ＂water to water＂ heat exchanging was made by self-made conductive hollow fiber heat exchanger to study the influence and regularity of the heat exchanger performance by changing the fluid process and flux.The result shows that the heat exchangers made by FEP with graphite composite has low cost,light weight,easy installation and transporting.They have thermal conductive material high fill rate per unit volume and great heat exchange performance.