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

doi:10.119494/0438-1157.20190175

Abstract

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

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

CLC Number:

TH 70

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.

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.

Figures/Tables 13

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

Fig.1 Experimental setup

Fig.2 Typical micro particle signal characteristics and identification

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

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

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

Fig.5 Location of measuring point

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

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

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

Fig.9 Observation on sedimentation of Al2O3 particles

Fig.10 Experimental results of sedimentation of Al2O3 particles

Fig.11 Experimental results of sedimentation of different density particles

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