Kinetics of Radial Segregation of Different Sized Irregular Particles in Rotary Cylinders
Kinetics of Radial Segregation of Different Sized Irregular Particles in Rotary Cylinders
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DOI：
10.1179/cmq.1989.28.1.29
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发表时间：
1989
影响因子：
0.9
通讯作者：
B. Pollard;H. Henein
中科院分区：
文献类型：
--
作者：
B. Pollard;H. Henein
摘要：由于进料或产品的尺寸、形状和密度差异，在回转反应器（例如窑、干燥器、混合器、混合器和球磨机）中会发生径向和轴向偏析。分离也可能受到反应器的设计和操作变量的影响。粒状固体和粉末的分离通常会导致产品质量不可接受和/或工艺效率低下。了解材料、设计和操作变量的影响是工程消除偏析的重要一步。本文介绍了由于水平旋转圆筒中不规则形状颗粒固体的尺寸差异而导致的径向偏析的一些观察结果。对于坍落床和滚动床，径向偏析动力学显示为零级，并且偏析速率与旋转速度成正比，并且与床深度和细粉百分比无关。此外，粒径差异越大，归一化分离速率越快。规模化标准...
AbstractRadial and axial segregation occur in rotary reactors such as kilns, driers, mixers, blenders and ball mills as a result of differences in the size, shape and density of the feed or product. Segregation may also be influenced by design and operating variables of the reactors. Segregation of granular solids and powers often leads to unacceptable product quality and/or poor process efficiency. Understanding the effect of material, design and operating variables is an important step in engineering de-segregation.This paper presents some observations of radial segregation due to size differences of irregularly shaped particulate solids in horizontal rotating cylinders. The kinetics of radial segregation is shown to be zero order for slumping and rolling beds and the rate of segregation is directly proportional to rotational speed and independent of bed depth and percent fines. Additionally, the larger the difference in particle size, the faster the normalized rate of segregation. The scale-up criteria...