气隙式膜蒸馏NaCl溶液的两相流强化

doi:10.16085/j.issn.1000-6613.2017.01.009

化工进展 ›› 2017, Vol. 36 ›› Issue (01): 66-70.DOI: 10.16085/j.issn.1000-6613.2017.01.009

气隙式膜蒸馏NaCl溶液的两相流强化

潘艳秋, 沈驭臣, 闫勋栋, 俞路

大连理工大学化工学院, 辽宁大连 116024

收稿日期:2016-06-13 修回日期:2016-06-27 出版日期:2017-01-05 发布日期:2017-01-05
通讯作者: 潘艳秋(1962-),女,工学博士,教授,博士生导师,从事膜分离和系统工程研究。E-mail:yqpan@dlut.edu.cn。
作者简介:潘艳秋(1962-),女,工学博士,教授,博士生导师,从事膜分离和系统工程研究。E-mail:yqpan@dlut.edu.cn。
基金资助:
中央高校基本科研业务费专项项目（DUT13JN04）。

Two-phase flow enhancement of air gap membrane distillation for aqueous NaCl solution

PAN Yanqiu, SHEN Yuchen, YAN Xundong, YU Lu

School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received:2016-06-13 Revised:2016-06-27 Online:2017-01-05 Published:2017-01-05

摘要/Abstract

摘要： 以膜蒸馏海水淡化为研究背景，采用气液两相流技术，对疏水改性管状陶瓷膜进行气隙式膜蒸馏模拟海水（NaCl溶液）强化实验研究。研究结果表明，在膜管内通入气体形成两相流后，去离子水和NaCl溶液的强化传质效率分别达到30.36%和28.57%。两相流过程强化影响因素的实验分别考察了料液温度、料液浓度和气体流量对渗透通量的影响，结果表明：在实验范围内，渗透通量随料液温度的升高而显著增大，且相比未通气体时增加了12%~44%；料液浓度增大导致渗透通量减小；气体的通入使得渗透通量增大，但当气体流量超过40L/h后，渗透通量却呈现缓慢下降的趋势；在体积气含率为0.5时的两相流强化效果最好，高速摄像仪拍摄到的现象很好地解释了该实验结果。研究结果将为进一步探究膜蒸馏强化过程的研究奠定基础。

关键词: 膜蒸馏, 两相流, 传质, 海水淡化, 气含率

Abstract: Gas-liquid flow technology was applied to enhance air-gap membrane distillation in seawater desalination. Modified hydrophobic tubular ceramic membrane was adopted in the process and sodium chloride aqueous solution was used as the model seawater in the present experimental study. Effects of solution temperature,solution concentration and gas flow rate on permeate fluxes were examined. Results showed that flux improvement efficiencies for deionized water and sodium chloride solution are 30.36% and 28.57%,respectively,after the formation of two-phase flow by gas piping in the membrane pipe. As the solution temperature is raised,the flux increases significantly and is 12%-44% higher than that without gas piping. As the solution concentration is increased,the flux decreases gradually. With the increase in the gas flow rate,the flux increases before 40 L/h,and then decreases slightly. When volume gas holdup is 0.5,the enhanced effect of two-phase flow is the best under the experimental conditions. Two-phase flow patterns were observed with a high-speed camera,which explained the experimental results well. This fundamental research would establish the foundation for further exploring enhancing methods of membrane distillation in seawater desalination.

Key words: membrane distillation, two-phase flow, mass transfer, seawater desalination, gas holdup

中图分类号:

TQ028.8

潘艳秋, 沈驭臣, 闫勋栋, 俞路. 气隙式膜蒸馏NaCl溶液的两相流强化[J]. 化工进展, 2017, 36(01): 66-70.

PAN Yanqiu, SHEN Yuchen, YAN Xundong, YU Lu. Two-phase flow enhancement of air gap membrane distillation for aqueous NaCl solution[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 66-70.

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气隙式膜蒸馏NaCl溶液的两相流强化

Two-phase flow enhancement of air gap membrane distillation for aqueous NaCl solution

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