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加强筋结构对离子膜内场分布特性的影响

李佑平1 张丽1 王学军2 许光文1,3 刘国桢4 刘云义1

(1.沈阳化工大学化学工程学院, 辽宁沈阳 110142)
(2.含氟功能膜材料国家重点实验室, 山东淄博 256401)
(3.中国科学院过程工程研究所多相复杂系统国家重点实验室, 北京 100190)
(4.蓝星沈阳轻工机械设计研究所, 辽宁沈阳 110015)

【摘要】为研究加强筋结构对离子膜内场分布特性的影响, 采用多孔介质渗流模型、稀物质传递及二次电流分布模型, 对电场条件下含加强筋的离子膜内物质迁移过程进行了数值模拟, 得到了物质在膜内的对流速度、浓度及电流密度分布, 考察了加强筋形状、间距及成网方式对场分布特性的影响。利用拍照法和图像处理技术对电解后膜表面离子浓度进行了测量, 实验结果与模拟结果吻合良好。结果表明, 在加强筋所围成的空隙中心处对流速度最大;越靠近加强筋, 速度越低, 浓度和电流密度越大;采用正交型加强筋, 膜内具有较高的对流速度和电流密度;加强筋间距越大, 电流密度越低, 分布越均匀;采用椭圆形长轴迎流的加强筋时, 膜内具有最高的电流密度, 但其电流密度分布最不均匀。

【关键词】 离子膜;加强筋;计算流体力学;数值模拟;

【DOI】

【基金资助】 含氟功能膜材料国家重点实验室开放课题项目 (DYYJY20170713A) ; 多相复杂系统国家重点实验室开放课题项目 (MPCS2017D11) ; 辽宁省自然科学基金项目 (201602596) ;

Effect of structure of reinforced fiber on field distribution characteristics in ionic membrane

LI Youping1 ZHANG Li1 WANG Xuejun2 XU Guangwen1,3 LIU Guozhen4 LIU Yunyi1

(1.School of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning, China 110142)
(2.National Key Laboratory of Fluorinated Functional Membrane Materials, Zibo, Shandong, China 256401)
(3.State Key Multi-phase Reaction Laboratory of Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China 100190)
(4.Bluestar Shenyang Research Institute of Light Industry Machinery, Shenyang, Liaoning, China 110015)

【Abstract】To investigate the influence of the structure of the reinforced fibers on field distribution in ion-exchange membrane (IEM), the matter migration processes in the IEM with the reinforced fibers in the presence of the electric field were simulated by using the percolation flow model in porous media, the transport of diluted species model and the secondary current distribution model. The convective velocity, concentration and current density in the IEM were obtained. The effects of the shape, pitch and the mode of network of the reinforced fibers on the field distribution were studied. The ion concentration on the surface of the membrane after electrolysis was measured by photography and image processing technology. The experimental results were in good agreement with the simulation results. The results show that the convective velocity at the central region encircled by the reinforced fibers is the highest. The closer to the reinforced fibers, the lower the velocity, and the greater the concentration and the current density. Higher velocity and current density can be obtained in the IEM by using the orthogonal reinforced fibers. The larger the distance between the ribs, the lower the current density, and the more uniform the distribution. The highest value and the most inhomogeneous distribution of the current density can be obtained by using the ellipse reinforced fibers with its major axis vertical to the flow.

【Keywords】 ion-exchange membrane; reinforced fiber; computational fluid dynamics; numerical simulation;

【DOI】

【Funds】 Open Funds of the National Key Laboratory of Fluorinated Functional Membrane Materials (DYYJY20170713A); Open Funds of the State Key Multi-phase Reaction Laboratory (MPCS2017D11) ; Natural Science Foundation of Liaoning of Liaoning Province (201602596);

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 10, Pages 4167-4176

October 2018

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Article Outline

Abstract

  • Introduction
  • 1 Experimental device and methods
  • 2 Numerical simulation
  • 3 Simulation method
  • 4 Results and analysis
  • 5 Conclusions
  • Symbol description
  • References