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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Process monitoring and control for constant separation conditions in centrifugal classification of fine particles
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Process monitoring and control for constant separation conditions in centrifugal classification of fine particles

机译：细颗粒离心分级中恒定分离条件的过程监控

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摘要

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.
机译：由于它们的高离心加速度，管状碗式离心机能够分离和分类细颗粒。然而，以半连续模式操作的这种类型的离心机具有主要缺点：在转子中的沉积物积累导致分离条件随着处理时间的连续降低。在这项研究中，使用光散射传感器通过测量溢流中的固体浓度在线监测此机理。实验产品为聚氯乙烯（低微米范围）和气相二氧化硅颗粒（纳米范围）。通过将传感器信号以离心机的速度并入控制回路中，可以弥补上述缺点。结果，直到转子的高填充水平，分级效率和产品损失都保持恒定。概述了该技术如何用于非常苛刻的分类任务，尤其是在精细，低密度的材料中。

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