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过程工程学报 ›› 2021, Vol. 21 ›› Issue (3): 251-258.DOI: 10.12034/j.issn.1009-606X.220077

• 流动与传递 • 上一篇    下一篇

极板凹凸结构形状对电解槽内部流动特性的影响

李 军1,2, 王 娟1,2*, 张 佳3, 邹 槊1,2, 何星晨1,2, 万加亿1,2   

  1. 1. 中国石油大学重质油国家重点实验室,北京 102249 2. 过程流体过滤与分离技术北京市重点实验室,北京 102249 3. 北京航天动力研究所,北京 100076
  • 收稿日期:2020-03-06 修回日期:2020-05-18 出版日期:2021-03-22 发布日期:2021-03-23
  • 通讯作者: 王娟
  • 基金资助:
    中国石油化工股份有限公司资助项目

Effects of pole plate's concave?convex shapes on flow characteristics in water electrolyzer

Jun LI1,2, Juan WANG1,2*, Jia ZHANG3, Shuo ZOU1,2, Xingchen HE1,2, Jiayi WAN1,2   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China 2. Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing 102249, China 3. Beijing Aerospace Propulsion Institute, Beijing 100076, China
  • Received:2020-03-06 Revised:2020-05-18 Online:2021-03-22 Published:2021-03-23
  • Contact: WANG Juan

摘要: 目前压滤式水电解槽极板普遍采用球形凹凸组合结构,目的是能够增强流动的扰动程度,使电解液分布更加均匀。为了进一步改善流场分布,将五种不同形式的凹凸组合结构与电解单元极板结构相结合,采用数值模拟方法分析并比较了不同凹凸组合结构通道内部的流动特性和流场分布特点。结果表明,五种结构通道内的速度分量uz均存在负速度分布区域,且该区域内的湍动能值较大;局部涡旋均表现为凹陷结构边缘处向凹陷内部发展的涡旋运动,涡旋流动细节与凹凸结构形式密切相关;平均涡通量及涡量值的分布表明凹凸结构主要影响局部区域的涡旋强度,对整体流动影响较小;流场分布均匀性与凹凸结构迎风面的形状尺寸等因素有关,其中Case D泪滴形结构的流场分布均匀性最好。

关键词: 压滤式水电解槽, 凹凸结构, 涡旋运动, 涡通量, 涡量, 分布均匀性

Abstract: At present, spherical concave?convex combination structure is widely used in the plate of pressure-filtered water electrolyzer. The purpose is to enhance the disturbance degree of flow and make the distribution of electrolyte more uniform. In order to further improve the flow field distribution, five different concave?convex combination structures were combined with the electrolytic cell plate structure. The flow characteristics and flow field distribution characteristics in different concave?convex combination structures were analyzed and compared by numerical simulation method. The results showed that there were negative velocity distribution regions in the velocity component uz of the five structure channels, which was dominated by circulation flow, and the turbulent kinetic energy was also larger in this region, among which case C and case E structure were most obvious. The local vortices showed the vortices moved from the edge of the depression structure to the interior of the depression, and the details of the vortices flow were closely related to the the concave?convex structure. The distribution of the mean vorticity flux and the vorticity value showed that the concave?convex structure mainly affected the local vorticity intensity, but had little influence on the overall flow, and the local vorticity value in case B was the largest. The uniformity of the flow field distribution was related to the shape and size of the windward face of the concave?convex structure, among which case D teardrop structure had the best uniformity of flow field distribution and case C ellipsoid structure was the worst.

Key words: pressure-filtered water electrolyzer, concave and convex structure, vortex motion, vortex flow, vorticity, distribution uniformity