高分子中空纤维蒸发器传热过程分析

发布时间：2018-03-26 05:33

本文选题：中空纤维蒸发器　切入点：传热　出处：《化工学报》2017年02期

【摘要】：蒸发器广泛应用于化工、食品等行业,传统的金属管蒸发器由于其耐酸碱腐蚀性差、表面易结垢等弱点,一定程度上限制了其应用范围,而具有优良性能的高分子中空纤维管可有效解决这些问题,具有很好的应用前景。采用自制的高分子改性中空纤维管,制备出非金属换热器,并进行了蒸发传热实验。结果表明,高分子中空纤维蒸发器的性能与料液温度有密切关系,沸腾进料时蒸发器的传热系数、产水量和热量利用率均高于低温进料;传热热阻主要集中在管外蒸汽加热侧和管壁的导热性能,当沸腾进料时管壁热阻占总传热热阻的66%以上,而管内蒸发侧传热热阻所占比重较低,均低于15.3%,且随着料液流速的增大而降低到5%以下;随着料液温度的降低,蒸发过程的传热系数、能量利用效率以及产水量均显著下降。
[Abstract]:Evaporators are widely used in chemical, food and other industries. The traditional metal tube evaporators are limited to some extent because of their weak points such as poor corrosion resistance to acid and alkali, easy scaling on the surface, etc. The macromolecule hollow fiber tube with excellent properties can solve these problems effectively and has a good application prospect. The non-metal heat exchanger is prepared by using the self-made polymer modified hollow fiber tube. The results show that the performance of the polymer hollow fiber evaporator is closely related to the feed temperature. The heat transfer coefficient, water production and heat utilization ratio of the evaporator in boiling feed are higher than those in low temperature feed. The heat transfer resistance is mainly concentrated on the heat conductivity of the outside steam heating side and the tube wall. The heat resistance of the tube wall accounts for more than 66% of the total heat transfer resistance when the boiling feed is fed, but the proportion of the heat transfer heat resistance in the evaporation side of the tube is relatively low. With the increase of feed flow rate, the heat transfer coefficient, energy use efficiency and water yield of evaporation process decreased significantly with the decrease of feed temperature.
【作者单位】：化学工程联合国家重点实验室;天津大学化工学院;天津化学化工协同创新中心;天津市膜科学与海水淡化重点实验室;
【基金】：天津市科技支撑计划项目(12ZCZDSF02200)~~
【分类号】：TQ051.62

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