管型混合澄清槽内的液-液两相流的数值模拟

doi:10.11949/0438-1157.20200928

化工学报 ›› 2021, Vol. 72 ›› Issue (4): 1965-1974.DOI: 10.11949/0438-1157.20200928

管型混合澄清槽内的液-液两相流的数值模拟

蓝敏乐^1,⁴(),谭博仁^1,⁴,许东兵^1,²,王勇^1,^2,³(),齐涛^1,^2,³

^1.中国科学院过程工程研究所，北京 100190
^2.中国科学院绿色过程制造创新研究院，北京 100190
^3.中国科学院稀土研究院，江西赣州 341000
^4.中国科学院大学，北京 101400

收稿日期:2020-07-13 修回日期:2020-10-10 出版日期:2021-04-05 发布日期:2021-04-05
通讯作者: 王勇
作者简介:蓝敏乐（1996—），男，硕士研究生，thu_lml@163.com
基金资助:
赣州市人民政府-中国科学院绿色过程制造创新研究院稀土产业基金项目(IAGM 2020DA02);国家重点研发计划项目(2019YFC1907700)

Numerical simulation of liquid-liquid two-phase flow in tubular mixer-settler

LAN Minle^1,⁴(),TAN Boren^1,⁴,XU Dongbing^1,²,WANG Yong^1,^2,³(),QI Tao^1,^2,³

^1.Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
^2.Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing 100190, China
^3.Institute of Rare Earths, Chinese Academy of Sciences, Ganzhou 341000, Jiangxi, China
^4.University of Chinese Academy of Sciences, Beijing 100190, China

Received:2020-07-13 Revised:2020-10-10 Online:2021-04-05 Published:2021-04-05
Contact: WANG Yong

摘要/Abstract

摘要：

管型混合澄清槽在工业生产中具有广阔的应用前景。通过计算流体力学分别对管型混合澄清槽内的混合室和澄清室进行数值模拟，系统地探究了分散相液滴尺寸（d₃₂₌100~500 μm）、进料油水比（O∶A = 1∶1~1∶5）、入口挡板及入口位置对混合澄清效果的影响，并将模拟结果与传统方型混合澄清槽进行对比。结果表明，管型混合室内的流场分布更合理，不易形成流动死区。管型混合室内搅拌桨上方和下方形成压力更小的低压区，流体的湍动能更大，搅拌性能更好。在混合室中，降低分散相d₃₂和进料油水比能够提高混合性能。在澄清室中，提高分散相d₃₂和降低进料油水比能够提高澄清性能，入口挡板能够有效提高澄清性能。

关键词: 数值模拟, 计算流体力学, 萃取, 两相流

Abstract:

The tubular mixer-settler has a broad application prospect in industrial production. A tubular mixer settler was simulated by using computational fluid dynamics (CFD). The effects of dispersed phase droplet size (d₃₂ = 100—500 μm), oil-water ratio (O∶A = 1∶1—1∶5), inlet baffle position on the mixing and settle performance of tubular mixer-settler were systematically investigated. The simulation results were compared with those of traditional square mixer-settler. The results show that the flow field distribution in the tubular mixer chamber is better than that in the square mixer chamber, in which the flow dead zone is not easy to generate. In the tubular mixer chamber, a lower pressure zone is formed above and below the impeller, and the turbulent kinetic energy of the fluid is higher. The mixing performance can be improved by reducing d₃₂ of dispersed phase and oil-water ratio of feed. In the tubular settler, increasing the dispersed phase d₃₂ and reducing the feed oil-water ratio can improve the clarification performance, and the inlet baffle can effectively improve the clarification performance.

Key words: numerical simulation, computational fluid dynamics, extraction, two-phase flow

中图分类号:

TQ 027.2

蓝敏乐, 谭博仁, 许东兵, 王勇, 齐涛. 管型混合澄清槽内的液-液两相流的数值模拟[J]. 化工学报, 2021, 72(4): 1965-1974.

LAN Minle, TAN Boren, XU Dongbing, WANG Yong, QI Tao. Numerical simulation of liquid-liquid two-phase flow in tubular mixer-settler[J]. CIESC Journal, 2021, 72(4): 1965-1974.

图/表 16

图1 管型混合澄清槽示意图

Fig.1 Schematic diagram of tubular mixing-settler

图2 混合室几何结构（单位为mm）

Fig.2 Geometry of mixer (the unit is mm)

图3 澄清室及挡板几何结构（单位为mm）

Fig.3 Geometry of settler and baffles (the unit is mm)

图4 结构化网格的划分及其质量

Fig.4 Generation and quality of structured grid

图5 混合室中的流场分布（操作条件为d32=250 μm, N = 330 r/min，Q = 0.7 L/s，O∶A=1∶3）

Fig.5 The flow field distribution in the mixer chamber

表1 两种混合室内的死区体积分数

Table 1 Volume fraction of dead zone in the two mixers

最大流速的百分比/%	死区体积分数/%
最大流速的百分比/%	管型混合澄清槽	方型混合澄清槽
5	1.23	2.42
7.5	4.13	4.88
10	7.72	8.84
12.5	16.2	18.7
15	32.4	33.7

图6 混合室内的压力分布

Fig.6 The pressure distribution in the mixer chamber

图7 混合室中的湍动能分布(操作条件为d32 = 250 μm，N = 330 r/min，Q = 0.7 L/s，O∶A=1∶3)

Fig.7 The distribution of turbulent kinetic energy in mixer chamber

表2 管型和方型混合澄清槽的平均湍动能、平均有机相相含率和有机相相含率方差

Table 2 Average turbulent kinetic energy, average organic phase holdup and variance of organic phase holdup in tubular and square mixer

混合澄清槽	平均湍动能/(m²/s²)	平均有机相相含率	有机相相含率方差
管型混合澄清槽	0.004145	0.2449	0.009062
方型混合澄清槽	0.003566	0.2400	0.007507

图8 分散相相含率分布对比（操作条件为d32 = 250 μm，N = 330 r/min，Q = 0.7 L/s，O∶A=1∶3）

Fig.8 The distribution of dispersed phase holdup in mixer chamber

图9 不同d32条件下的分散相相含率分布（操作条件为N = 330 r/min，Q = 0.7 L/s，O∶A=1∶3）

Fig.9 Distribution of dispersed phase holdup under different d32

图10 不同油水比条件下的分散相相含率分布

Fig.10 Distribution of dispersed phase holdup under different oil-water ratio

图11 不同d32条件下的澄清室分散相相含率分布

Fig.11 Distribution of dispersed phase holdup in settler with different d32

图12 不同进料油水比条件下的澄清室分散相相含率

Fig.12 Distribution of dispersed phase holdup in settler with different oil-water ratio

图13 挡板对管型澄清室澄清效果的影响（d32= 250 μm，O∶A=1∶1）

Fig.13 Effect of baffle on the settle performance in tubular settler

图14 挡板对管型澄清室内流场分布的影响(d32= 250 μm，O∶A=1∶1)

Fig.14 Effect of baffle on flow field distribution of tubular settler

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管型混合澄清槽内的液-液两相流的数值模拟

Numerical simulation of liquid-liquid two-phase flow in tubular mixer-settler

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