Process monitoring and control for constant separation conditions in centrifugal classification of fine particles
Process monitoring and control for constant separation conditions in centrifugal classification of fine particles
复制标题
DOI：
10.1016/j.apt.2014.01.022
复制
发表时间：
2014-05-01
影响因子：
5.2
通讯作者：
Nirschl, Hermann
中科院分区：
文献类型：
--
作者：
Konrath, Manuel;Hackbarth, Max;Nirschl, Hermann
由于其高离心加速度管状碗离心机使细颗粒的分离和分类。然而，这种在半连续模式下运行的离心机有一个主要缺点：在转子中沉积导致分离条件随着处理时间的推移而连续退化。本研究采用光散射传感器对溢流中固体浓度进行在线监测。聚氯乙烯（低微米范围）和气相二氧化硅颗粒（纳米范围）作为实验产品。通过将传感器信号与离心机的转速结合到控制回路中，上述缺陷得到了补偿。因此，分级效率和产品损失保持恒定，直到转子的高填充水平。概述了该技术如何用于非常苛刻的分类任务，特别是在精细、低密度材料的情况下。(C) 2014日本粉体技术学会。由爱思唯尔B.V.和日本粉末技术协会出版。版权所有。
Due to their high centrifugal acceleration tubular bowl centrifuges enable the separation and classification of fine particles. However, this type of centrifuge which is operated in a semi-continuous mode has a major disadvantage: sediment buildup in the rotor leads to a successive degradation of separation conditions over process time. In this study, a light scattering sensor was used to monitor this mechanism online by measuring the solids concentration in the overflow. Polyvinylchloride (low micrometer range) and fumed silica particles (nanometer range) served as experimental products. By incorporating the sensor signal in a control loop with the speed of the centrifuge, the mentioned drawback was compensated. As a result, grade efficiency and product loss were kept constant up to a high filling level of the rotor. It is outlined how this technology can be used for very demanding classification tasks, especially in case of fine, low-density materials. (C) 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.