化工学报 ›› 2020, Vol. 71 ›› Issue (8): 3518-3526.DOI: 10.11949/0438-1157.20200185

• 流体力学与传递现象 • 上一篇    下一篇

电渗析脱盐过程离子传递现象的数值模拟

祝海涛1,2,3(),杨波2,3,吴雅琴2,3,高从堦1   

  1. 1.浙江工业大学膜分离与水科学技术中心,浙江 杭州 310014
    2.杭州水处理技术研究开发中心有限公司,浙江 杭州 310012
    3.浙江省海水淡化技术研究重点实验室,浙江 杭州 310012
  • 收稿日期:2020-02-25 修回日期:2020-05-26 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: 祝海涛
  • 作者简介:祝海涛(1990—),男,博士,高级工程师,zhuhaitao001@126.com
  • 基金资助:
    国家重点研发计划项目(2017YFC0403701);杭州市重大科技创新项目(20182013A02)

Numerical simulation of ion transfer during electrodialysis desalination process

Haitao ZHU1,2,3(),Bo YANG2,3,Yaqin WU2,3,Congjie GAO1   

  1. 1.Center for Membrane Separation and Water Science & Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    2.Hangzhou Water Treatment Technology Development Center Co. , Ltd. , Hangzhou 310012, Zhejiang, China
    3.Zhejiang Key Laboratory of Seawater Desalination Technology Research, Hangzhou 310012, Zhejiang, China
  • Received:2020-02-25 Revised:2020-05-26 Online:2020-08-05 Published:2020-08-05
  • Contact: Haitao ZHU

摘要:

建立了电渗析脱盐过程离子传递稳态模型,研究了离子电荷数、离子扩散系数和离子交换膜电导率对脱盐过程传质的影响,描述了离子浓度分布、电势分布和离子传递通量分布的变化情况。研究表明:相较于一价离子,二价离子在电渗析过程中膜两侧浓度差较小,跨膜电压降较高,各项传递通量较小;当离子扩散系数增大时,膜两侧浓度差减小,跨膜电压降升高,总传递通量和电迁移通量增大;当离子交换膜电导率增大时,膜两侧浓度差增大,跨膜电压降降低,各项传递通量均增大。

关键词: 电渗析, 脱盐, 离子传递, 模型, 数值模拟

Abstract:

A mathematical model of steady-state ion transfer during electrodialysis process was established to study the effects of ion charge number, diffusion coefficient and conductivity of ion-exchange membrane on mass transfer during the desalination process. The changes of ion concentration distribution, electric potential distribution and ion transfer flux distribution were described. The results showed that for the divalent ion concentration difference over the membrane decreased, transmembrane potential drop increased and transfer flux decreased in comparison with the monovalent ion. When ion diffusion coefficient was larger, concentration difference over the membrane became smaller, transmembrane potential drop, total flux and electromigration flux became higher. Additionally, ion-exchange membrane with larger conductivity made concentration difference over the membrane larger, transmembrane potential drop lower and transfer flux higher.

Key words: electrodialysis, desalination, ion transfer, model, numerical simulation

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