Mass Transfer Enhancement and Scale Inhibition Performance with Gas-Liquid Two-Phase Flow in Direct Contact Membrane Distillation

被引：0

作者：

Deng H. ^{[1
]}

Ma S. ^{[1
]}

Zhang W. ^{[1
]}

Zhang Z. ^{[1
,2
]}

Zhang S. ^{[1
]}

机构：

[1] School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin

[2] School of Environment, Harbin Institute of Technology, Harbin

来源：

Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 06期

关键词：

direct contact membrane distillation; gas-liquid two-phase flow; mass transfer; polarization phenomenon; process enhancement;

D O I：

10.11784/tdxbz202203034

中图分类号：

学科分类号：

摘要：

In this study，mass transfer enhancement and scale inhibition performance with gas-liquid two-phase flow on direct contact membrane distillation process were systematically studied. Furthermore，combined with the observation of bubble size and flow characteristics in the flow channel，the mass transfer enhancement effect of bubbling in membrane distillation under different feed temperatures，feed concentrations，inlet gas flow rates and feed flow rates was discussed. The results show that at the same bubbling intensity，the water flux enhancement is more significant in the systems with lower feed temperature and higher feed concentration. This is because the temperature and concentration polarizations are more serious in the conditions. The size of bubbles increases with the increase of the inlet gas flow rate，while the rising speed of the bubbles and the flux enhancement ratio first increases and then decreases with the increase of the bubble size. The bubbles in the size range of 50 to100 mm2 have the fastest rising speed，the strongest disturbance to the membrane surface boundary layer，and the best mass transfer enhancement effect. Since the volume of bubbles over 100 mm2 is considerably large，the resistance from the screen and wall will be greater，resulting in the decrease of the rising speed of bubbles. Moreover，the excessive large bubbles reduce the contact area between the feed solution and the membrane，thus decreasing the effective mass transfer membrane area，and weakening the strengthening effect. With the increase of feed flow rate，the shearing effect of the screen on the bubbles increases，shearing them to smaller size. A higher gas flow rate is required for the optimal mass transfer enhancement effect. The results also demonstrate that bubbling could improve the water flux in the concentration of the salt solution，delay the time of crystal deposition on the membrane surface，and considerably retard the growth rate of the scaling layer. The results of this work provide an important reference for the mass transfer enhancement with gas-liquid two-phase flow in membrane distillation processes. © 2023 Tianjin University. All rights reserved.

引用

页码：595 / 603

页数：8

共 28 条

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