微颗粒实时在线监测仪在固液体系测量中的应用

doi:10.119494/0438-1157.20190175

化工学报 ›› 2019, Vol. 70 ›› Issue (S2): 181-190.DOI: 10.119494/0438-1157.20190175

微颗粒实时在线监测仪在固液体系测量中的应用

李勇¹(),刘飞²(),董海峰³,张香平³,陈靖容¹,刘仁材¹,金劭²,吴战鹏²,王晓东¹()

1. 中国科学院大学材料科学与光电技术学院，北京 100049
2. 北京化工大学理学院，北京 100084
3. 中国科学院过程工程研究所绿色过程与工程重点实验室，北京 100190

收稿日期:2019-03-03 修回日期:2019-04-22 出版日期:2019-09-06 发布日期:2019-09-06
通讯作者: 王晓东
作者简介:李勇（1991—），男，硕士研究生，liyong16@mails.ucas.ac.cn；刘飞（1993—）,男，硕士研究生，1183563786@qq.com|李勇（1991—），男，硕士研究生，liyong16@mails.ucas.ac.cn；刘飞（1993—）,男，硕士研究生，1183563786@qq.com
基金资助:
中国科学院装备研制项目(YZ201567);中国科学院国际合作局国际大科学培育专项“液态阳光”能源体系计划项目(211211KYSB20180020)

Application of micro particle real-time online analyzer in solid-liquid system measurement

Yong LI¹(),Fei LIU²(),Haifeng DONG³,Xiangping ZHANG³,Jingrong CHEN¹,Rencai LIU¹,Shao JIN²,Zhanpeng WU²,Xiaodong WANG¹()

1. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
2. Faculty of Science, Beijing University of Chemical Technology, Beijing 100084, China
3. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Received:2019-03-03 Revised:2019-04-22 Online:2019-09-06 Published:2019-09-06
Contact: Xiaodong WANG

摘要/Abstract

摘要：

使用自研的微颗粒实时在线监测仪对微颗粒在液相中的悬浮和沉降过程进行了在线定量测量研究。首先，通过与商用离线仪器Multisizer 4e的对比验证了自研的微颗粒监测仪实时、在线测量的可靠性。然后，选用了标准物质乳胶微球、Al₂O₃和 ZrO₂三种密度不同的百微米量级的微颗粒，对磁力搅拌器中稳定转速下的悬浮特性以及搅拌停止后颗粒的重力沉降过程进行实时在线观测，得到了这两种情形下测量点的颗粒浓度和粒度分布信息。实验结果表明，即使搅拌速度超过临界悬浮转速，搅拌容器中的Al₂O₃颗粒仍存在不同程度的非均匀分布状态，呈现出一定的浓度和粒度分布。在重力沉降的瞬变过程中，固体颗粒的粒径和密度在固液两相分离的过程中有着显著的作用。

关键词: 粒度分布, 颗粒过程, 两相流, 在线监测, 电阻脉冲

Abstract:

The micro particles’suspension and sedimentation processes were quantitatively studied by using a self-developed micro particle real-time online analyzer. After verifying the accuracy and reliability of the self-developed micro particle analyzer, three micro particles of different densities, the latex particle reference material, Al₂O₃ and ZrO₂, were selected to conduct experiments. Through monitoring the suspension and gravity sedimentation processes, the particles’concentration and granularity distribution information were then obtained. The results show that the Al₂O₃ particles exhibit non-uniform distribution state even under super-critical suspension speed. And the particles’granularity and density play a significant role in solid-liquor separation during the transient process of gravity deposition.

Key words: particle size distribution, particulate processes, two-phase flow, online monitoring, resistance pulse

中图分类号:

TH 70

李勇, 刘飞, 董海峰, 张香平, 陈靖容, 刘仁材, 金劭, 吴战鹏, 王晓东. 微颗粒实时在线监测仪在固液体系测量中的应用[J]. 化工学报, 2019, 70(S2): 181-190.

Yong LI, Fei LIU, Haifeng DONG, Xiangping ZHANG, Jingrong CHEN, Rencai LIU, Shao JIN, Zhanpeng WU, Xiaodong WANG. Application of micro particle real-time online analyzer in solid-liquid system measurement[J]. CIESC Journal, 2019, 70(S2): 181-190.

图/表 13

表1 测量方法对比

Table 1 Comparison of measurement methods

分类	测量方法	局限性
非接触式方法	激光散射法，激光束图像分析法，光束衰减法	要求反应容器和液相透明，限制工业应用
非接触式方法	粒子图像测速技术，激光多普勒测速技术，超声多普勒测速技术	只能直接获取颗粒速度信息
接触式方法	取样法	迟滞性，非等动力取样
	电导法	要求高纯度液相和恒温，限制工业应用
	光学探针法	只能获得局部区域的平均值

图1 实验装置1—库尔特孔；2—铂片电极；3—库尔特孔管；4—自研的微颗粒测量仪；5—导流管；6—蠕动泵；7—磁子；8—磁力搅拌器；9—屏蔽匹配线

Fig.1 Experimental setup

图2 典型的微颗粒信号特征及识别

Fig.2 Typical micro particle signal characteristics and identification

图3 利用自研微颗粒实时在线监测仪测得的两种标称尺寸乳胶标准微颗粒的分布

Fig.3 Distribution of two latex particle reference materials measured by self-developing micro particle real-time online monitor

图4 利用Mutisizer4e测得的两种标称尺寸乳胶标准微颗粒的分布

Fig.4 Distribution of two latex particle reference materials measured by Multisizer 4e

表2 三种选用的固体颗粒尺寸和物性参数

Table 2 Particle sizes and physical parameters selected in experiment

颗粒名称	关键物性	生产单位
乳胶标准微颗粒	粒度分布：标称值 120 μm；密度：略大于水	北京海岸鸿蒙标准物质技术有限责任公司
乳胶标准微颗粒	粒度分布：标称值160 μm；密度：略大于水	北京海岸鸿蒙标准物质技术有限责任公司
球形Al₂O₃颗粒CAP 90^①	粒度D₅₀：90 μm；密度：3.5 g/cm³	南京天行新材料有限公司
ZrO₂颗粒	粒度D₅₀：100 μm；密度：5.85 g/cm³	浙江湖州湖磨有限公司

图5 测点位置

Fig.5 Location of measuring point

图6 单个测量点（r=7.5 cm, φ=0,z=9.5 cm）Al2O3颗粒的分布特性

Fig.6 Distribution of Al2O3 particles at measurement points (r=7.5 cm, φ=0, z=9.5 cm)

图7 Al2O3微颗粒沿z向（φ=0,z=9.5cm）的分布特性

Fig.7 Distribution characteristics of Al2O3 micro particles along z-direction (φ=0, z=9.5 cm)

图8 Al2O3颗粒在z-r面内的分布特性

Fig.8 Distribution of Al2O3 particles in z-r plane

图9 Al2O3颗粒沉降的实验观测

Fig.9 Observation on sedimentation of Al2O3 particles

图10 Al2O3颗粒沉降的实验结果

Fig.10 Experimental results of sedimentation of Al2O3 particles

图11 密度不同颗粒沉降的实验结果

Fig.11 Experimental results of sedimentation of different density particles

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微颗粒实时在线监测仪在固液体系测量中的应用

Application of micro particle real-time online analyzer in solid-liquid system measurement

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