不连续扰流板强化搅拌的模拟仿真及机理分析

doi:10.16085/j.issn.1000-6613.2021-1345

化工进展 ›› 2022, Vol. 41 ›› Issue (6): 2871-2883.DOI: 10.16085/j.issn.1000-6613.2021-1345

不连续扰流板强化搅拌的模拟仿真及机理分析

来奎¹^,²(), 王仕博¹^,²(), 徐建新¹^,², 肖清泰¹^,², 王华¹^,², 李春林³

^1.冶金节能减排教育部工程研究中心，云南昆明 650000
^2.冶金化工节能环保技术国家地方联合工程研究中心，云南昆明 650000
^3.鑫联环保科技股份有限公司，云南红河 654400

收稿日期:2021-06-28 修回日期:2021-08-26 出版日期:2022-06-10 发布日期:2022-06-21
通讯作者: 王仕博
作者简介:来奎（1997—），男，硕士研究生，研究方向为冶金过程强化。E-mail：1486245618@qq.com。
基金资助:
云南省科技厅科技计划(202101AU070031);云南省教育厅科学研究基金(2021J0063)

Simulation and mechanism analysis of discontinuous spoiler enhanced stirring

LAI Kui¹^,²(), WANG Shibo¹^,²(), XU Jianxin¹^,², XIAO Qingtai¹^,², WANG Hua¹^,², LI Chunlin³

^1.Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming 650000, Yunnan, China
^2.National & Local Joint Engineering Research Center of Energy Saving and Environmental Protection Technology in Metallurgy and Chemical Engineering Industry, Kunming 650000, Yunnan, China
^3.Greennovo Environmental Technology Co. , Ltd. , Honghe 654400, Yunnan, China

Received:2021-06-28 Revised:2021-08-26 Online:2022-06-10 Published:2022-06-21
Contact: WANG Shibo

摘要/Abstract

摘要：

基于传统的四挡板搅拌槽，添加了不连续扰流板，并对其进行了非对称布置。采用数值模拟方法，对比研究了无不连续扰流板、不连续扰流板对称布置和两种不连续扰流板非对称布置的四挡板搅拌槽内的流场特性和混沌效果。结果表明，在功率准数不变的情况下，不连续扰流板会抑制周期性的流体径向和切向流动，下降幅度分别为42.19%和19.55%，增强传质作用更强的轴向流动，增幅为20.27%，破坏流体运动的周期性，引起宏观流场的整体流型增加了大量拉伸折叠的随机迹线变化，令示踪流体发散至周围区域，不连续扰流板附近区域呈现混沌特性，混合效果提高；一对和两对处于相对位置的不连续扰流板上下布置时的最大速度差相较于对称布置时的分别提高472.72%和218.18%，这种速度场分布的不均匀，大大增加了流体微团碰撞概率，整体搅拌区域趋于混沌，搅拌过程被强化；将其应用于硫酸锌净化过程，结果表明，非对称布置扰流板打破了槽内的周期性拟序结构，引起多尺度涡旋产生，让能量耗散于杂质离子和锌粉粒子之间的碰撞，提高了置换反应速率，整个过程节约能量14.3%。

关键词: 不连续扰流板, 非对称布置, 搅拌容器, 数值模拟, 混沌

Abstract:

Based on the traditional four-baffled stirred tank, the discontinuous spoiler was added and arranged asymmetrically. The flow field characteristics and chaotic effect in four-baffled stirred tank with no discontinuous spoiler, symmetrical arrangement of discontinuous spoiler and two kinds of asymmetric arrangement of discontinuous spoiler were studied by numerical simulation. The results showed that under the condition of constant power number, the discontinuous spoiler could suppress the periodic radial and tangential flow by 42.19% and 19.55%, respectively, and the axial flow with stronger mass transfer was increased by 20.27%. The tracer fluid diffused to the surrounding area, the area near the discontinuous spoiler presented chaotic characteristics, and the mixing effect was improved. The maximum speed difference of one pair and two pairs of discontinuous spoilers arranged up and down in relative positions was increased by 472.72% and 218.18%, respectively, as compared with that in symmetrical arrangement. The uneven distribution of velocity field greatly increased the collision probability of fluid clusters, and the whole stirring region tended to be chaotic, and the stirring process is strengthened. The asymmetric arrangement of spoilers broke the periodic coherent structure in the tank and caused multi-scale vortices, which dissipated energy in the collision between impurity ions and zinc powder particles and improved the displacement reaction rate. The energy consumption of the whole process was about 14.3%.

Key words: discontinuous spoiler, asymmetric arrangement, stirred vessel, numerical simulation, chaos

中图分类号:

TQ051.7

来奎, 王仕博, 徐建新, 肖清泰, 王华, 李春林. 不连续扰流板强化搅拌的模拟仿真及机理分析[J]. 化工进展, 2022, 41(6): 2871-2883.

LAI Kui, WANG Shibo, XU Jianxin, XIAO Qingtai, WANG Hua, LI Chunlin. Simulation and mechanism analysis of discontinuous spoiler enhanced stirring[J]. Chemical Industry and Engineering Progress, 2022, 41(6): 2871-2883.

图/表 16

图1 含锌固废冶炼工艺流程和微电池原理示意图

图2 不连续扰流板强化净化热态实验及流型示踪检测实验装置

图3 实验与数值计算的液面随时间变化情况的对比及此过程迹线变化

图4 四挡板搅拌槽内迹线随时间的变化

图5 四种搅拌槽和搅拌桨的模型及尺寸不连续扰流板的布置方式：工况Ⅰ无扰流板；工况Ⅱ均位于蓝色平面；搅拌槽Ⅲ相邻两块位于黄色平面，另两块位于红色平面；搅拌槽Ⅳ相对两块位于蓝色平面，另两块分别位于黄色和红色平面

图6 网格无关性检验

图7 静区域和动区域的网格划分

表1 四种工况的功率准数

布置方式	功率准数（模拟）	功率准数（实验）	模拟与实验的差比/%	工况Ⅱ、Ⅲ和Ⅳ与工况Ⅰ 的差比（实验）/%
Ⅰ	3.710	3.751	-1.09	—
Ⅱ	3.711	3.834	-3.21	0.21
Ⅲ	3.705	3.751	-1.23	0
Ⅳ	3.727	3.834	-2.79	0.21

图8 Line1的选取位置示意图

图9 不连续扰流板导致流体迹线拉伸折叠的机理示意图

图10 时间为1s时三种速度在 Line1上的分布

图11 不连续扰流板影响下的流体迹线

图12 Line2和Line3的选取位置示意图

图13 时间为1s时四种工况相同高度下的速度差

图14 速度场不均匀强化混沌动量传递机理

图15 Cd离子浓度及净化率随时间的变化和净化过程的涡旋示意图

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不连续扰流板强化搅拌的模拟仿真及机理分析

Simulation and mechanism analysis of discontinuous spoiler enhanced stirring

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