化工进展 ›› 2019, Vol. 38 ›› Issue (11): 4831-4837.DOI: 10.16085/j.issn.1000-6613.2019-0250

• 化工过程与装备 • 上一篇    下一篇

填充沸石的大型离子交换柱内流场模拟

郭小甫1,2(),袁俊生1,2(),赵颖颖1,2,李非1,2,纪志永1,2   

  1. 1. 河北工业大学化工学院,天津300130
    2. 海水资源高效利用化工技术教育部工程研究中心,天津300130
  • 收稿日期:2019-02-22 出版日期:2019-11-05 发布日期:2019-11-05
  • 通讯作者: 袁俊生
  • 作者简介:郭小甫(1982—),女,硕士,研究方向为海水化学资源利用。E-mail:guoxiaofu@hebut.edu.cn
  • 基金资助:
    国家重点研发计划(2016YFB0600504);福建省产业技术联合创新项目(闽发改投资[2015]489号);河北省青年科学基金(B2017202246)

Flow field simulation of large ion exchange column filled with zeolite

Xiaofu GUO1,2(),Junsheng YUAN1,2(),Yingying ZHAO1,2,Fei LI1,2,Zhiyong JI1,2   

  1. 1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
    2. Engineering Research Center of Seawater Utilization of Ministry of Education, Tianjin 300130, China
  • Received:2019-02-22 Online:2019-11-05 Published:2019-11-05
  • Contact: Junsheng YUAN

摘要:

针对沸石法海水富钾工程化放大中的关键问题,采用Fluent中多孔介质模型对填充沸石的大型离子交换柱内流场进行了模拟研究。主要考察了沸石的孔隙率和颗粒直径、海水进口速度、沸石柱长径比以及柱内形成的沸石层凹坑等条件对离子交换柱内流体流动的影响,结果发现:孔隙率和颗粒直径直接关系到沸石层内流体的速度分布,海水进口速度、沸石柱长径比等条件对沸石层内的流体流动并无显著影响;而在孔隙率和颗粒直径确定的条件下,由于海水冲击形成的凹坑对沸石层内流体影响较大,会在凹坑两侧形成滞留区,进而影响沸石对海水中钾的吸附。根据模拟结果优化了填充材料、设备结构以及工艺等参数,为沸石法海水富钾关键装备进一步扩大规模提供了理论支撑。

关键词: 沸石, 多孔介质, 离子交换柱, 流场, 模拟

Abstract:

Aiming at the key problems in the engineering enlargement of technology for seawater potassium extraction by zeolite, the flow field in the large ion-exchange columns filled with zeolite was simulated by Fluent software with the porous medium model. The influence factors on flow field were studied, including porosity, particle diameter, inlet velocity, length-to-diameter ratio, the pit formed by seawater, and so on. The results showed that the porosity and particle diameter are directly related to the velocity distribution of the fluid in the zeolite layer, while the inlet velocity, length-to-diameter ratio and other conditions have no significant effect on the fluid flow. In addition, under the condition of constant porosity and particle diameter, the pit impacted by seawater has a great influence on the fluid in the zeolite layer by forming retention zones on both sides of the pit, which will affect the adsorption of zeolite for potassium in the seawater. Finally, according to the simulation results, the filling materials, equipment structure and process parameters were optimized. This study provides a theoretical support for the further enlargement of the seawater potassium extraction technology.

Key words: zeolite, porous media, ion exchange column, flow field, simulation

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