激光诱导荧光技术观测填料表面非等温降膜流动形态变化

doi:10.16085/j.issn.1000-6613.2016.12.014

化工进展 ›› 2016, Vol. 35 ›› Issue (12): 3830-3835.DOI: 10.16085/j.issn.1000-6613.2016.12.014

激光诱导荧光技术观测填料表面非等温降膜流动形态变化

黄益平¹, 周俊超¹, 黄晶晶¹, 陆晓咏¹, 刘春江^1,2, 李凭力^1,2, 耿洋², 刘辉²

1 中建安装工程有限公司, 江苏南京 210023;
2 天津大学化工学院, 天津 300072

收稿日期:2016-04-15 修回日期:2016-06-07 出版日期:2016-12-05 发布日期:2016-12-05
通讯作者: 刘辉,副研究员,从事化学工程、反应及分离过程强化等领域研究。E-mail:hui.liu@tju.edu.cn。
作者简介:黄益平(1985-),男,工程师,从事化学工程、化工系统工程及过程强化等领域研究。E-mail:huanip@163.com。

Laser induced fluorescence technique for observing non-isothermal falling film flow on packing surface

HUANG Yiping¹, ZHOU Junchao¹, HUANG Jingjing¹, LU Xiaoyong¹, LIU Chunjiang^1,2, LI Pingli^1,2, GENG Yang², LIU Hui²

1 China Construction Installation Engineering Co., Ltd., Nanjing 210023, Jiangsu, China;
2 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2016-04-15 Revised:2016-06-07 Online:2016-12-05 Published:2016-12-05

摘要/Abstract

摘要： 非等温降膜流动在精馏过程中较为常见，其流动特性较为特殊，对填料表面的质量和热量传递有重要影响。本文搭建了可视化的实验装置，在保证液相室温进料的前提下升高填料温度，在规整填料表面构造液相被加热的非等温降膜流动，运用激光诱导荧光技术对液膜形态变化进行观测分析，对液体润湿面积、液膜厚度等参数进行比较。结果表明，随着填料温度的升高，液体润湿面积显著减小，波谷处液膜厚度显著增加，液膜逐渐收缩为沟流，填料表面的不规则液滴数目增多，干板现象越发严重。液体的聚并和分散轨迹消失，液相再分布及表面更新能力降低。因此，填料表面的非等温降膜流动液膜收缩现象十分明显，降低传热传质能力，需在工业生产中引起足够重视。

关键词: 非等温降膜流动, 激光诱导荧光技术, 液膜收缩, 填料

Abstract: Non-isothermal falling film flow is common in distillation process,which has great effect on the mass and heat transfer process on the surface of packing due to its particular property. In this paper,visualization device was set up and morphologic change of non-isothermal falling film flow on structured packing surface,in which liquid phase was heated by packing,was observed and analyzed through laser induced fluorescence system. Wetting area and film thickness were compared under different condition. Wetting area decreased remarkably with the increase of packing temperature,leading to dry plate phenomenon. The increase of local film thickness in wave trough of packing and formation of rivulet and irregular droplets were captured by LIF as well. Liquid aggregation and dispersion trajectories disappeared,weakening the redistribution and surface renewal ability. As a result,the shrinkage of non-isothermal falling film on structured packing surface is significant,which calls for enough attention to pay in industrial production for the weakening of heat and mass transfer capability.

Key words: non-isothermal falling film flow, LIF, film shrinkage, packing

中图分类号:

TQ053.5

黄益平, 周俊超, 黄晶晶, 陆晓咏, 刘春江, 李凭力, 耿洋, 刘辉. 激光诱导荧光技术观测填料表面非等温降膜流动形态变化[J]. 化工进展, 2016, 35(12): 3830-3835.

HUANG Yiping, ZHOU Junchao, HUANG Jingjing, LU Xiaoyong, LIU Chunjiang, LI Pingli, GENG Yang, LIU Hui. Laser induced fluorescence technique for observing non-isothermal falling film flow on packing surface[J]. Chemical Industry and Engineering Progree, 2016, 35(12): 3830-3835.

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激光诱导荧光技术观测填料表面非等温降膜流动形态变化

Laser induced fluorescence technique for observing non-isothermal falling film flow on packing surface

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