混合澄清槽澄清室内流场特性测量

doi:10.11949/0438-1157.20190534

摘要/Abstract

摘要：

混合澄清槽被广泛应用于稀土溶剂萃取过程，在澄清室内的分相过程是非常重要的环节。采用粒子图像测速技术对澄清室内速度流场进行了测量，比较了不同操作参数下，主要包括混合室搅拌转速、油水两相体积分数以及不同挡板设计对澄清室内流场结构的影响。搅拌转速作为能耗输入，与澄清室内速度矢量大小呈正相关关系；增加油相后，对澄清室内流场结构影响不大，但会使得流动方向发生变化，且使得湍动增加。挡板设计是强化澄清室分相性能的重要途径，对不同挡板组合的澄清室设计进行了测量分析，对挡板形状（Ⅴ形与矩形）、挡板数量与安置位置的影响进行了比较，并采用电导率仪获得澄清室水相出口处溶解性总固体浓度，表征油相夹带情况，对不同挡板设计进行了比较和优化。

关键词: 澄清槽, 流动特性, 粒子图像测速技术, 挡板, 油相夹带

Abstract:

The mixer-settler is widely used in the rare earth solvent extraction process, and the phase separation process in the settler is very important. The velocity flow field in settler was measured by particle image velocimetry(PIV). Different operational parameters were estimated to study the flow characteristics in settler. These parameters were impeller speed in mixer, volume fraction of organic phase, and different baffle designs. The magnitude of velocity vector in settler had positive correlation with the impeller speed, which could be considered as energy input. The volume fraction of organic phase had little influence on the flow pattern. But it changed the flow direction of the aqueous phase, and strengthened the turbulence in settler. Adding baffle is a promising method to improve the performance of settling. The impact of number and position of baffles in settler on flow structure were surveyed and analyzed. Moreover, the entrainment in aqueous outlet was obtained by conductivity meter, giving clues for comparison and optimization of settler.

Key words: settler, flow characteristics, particle image velocimetry, baffle, entrainment

中图分类号:

TQ 028.8

叶思施, 唐巧, 王运东. 混合澄清槽澄清室内流场特性测量[J]. 化工学报, 2020, 71(2): 535-543.

Sishi YE, Qiao TANG, Yundong WANG. Measurement of flow characteristics of settler in mixer-settler[J]. CIESC Journal, 2020, 71(2): 535-543.

图/表 11

图1 混合澄清槽的实验结构

Fig.1 Experimental structure of mixer-settler

图2 粒子图像测速装置实物图

Fig.2 Real picture of particle image velocimetry

图3 粒子图像测速技术原理

Fig.3 Schematic diagram of particle image velocity

表1 20℃下去离子水与磺化煤油的物性

Table 1 Properties of deionized water and sulfonated kerosene

流体	密度/(kg/m³)	黏度/(kg/(m·s))
去离子水	998.2	0.001
磺化煤油	780	0.0024

图4 不同搅拌转速下澄清室内速度流场

Fig.4 Velocity vector in settler for different rotating speeds

图5 不同油相体积分数下澄清室内速度流场

Fig.5 Velocity vector in settler for different organic volume fraction

图6 澄清室内挡板设计及安置位置

Fig.6 Baffle design in settler

表2 挡板参数及安置位置

Table 2 Parameters and location of baffles

结构参数	V形挡板	矩形挡板
长度 x/mm	5	5
宽度y/mm	200	200
高度z/mm	~170	100
挡板角度/(°)	45	—

图7 不同油相体积分数下具挡板澄清室速度流场

Fig.7 Velocity vector diagrams in settler with baffle for different organic volume fraction

图8 不同挡板设计下澄清室内速度流场

Fig.8 Velocity vector diagrams in settler with different baffle designs

图9 不同设计下澄清室水相出口处油相夹带

Fig.9 Organic entrainment in aqueous outlet of settler with different baffle designs

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