Development of anAccurate High-throughput Multiple-product Submicron Classification System using an Almost Rigidly Rotating Flow

为了使湿式离心分级在刚性旋转的壳壁和芯壁之间产生的几乎是刚性旋转的流动中能够非常准确地对细颗粒进行分级，我们研究了一种新的高通量多产品分级系统。因此，我们得出了以下主要结论。关于高通量，为了提高通量，我们采用了新的供料颗粒和收集产品的方法，从而获得了以下主要结果：(1)在新的FOF-WCW型中，在外壳和芯柱壁之间的Ekman输送向内径向改变，细颗粒肯定被导向细产品，从而实现了高精度。(2)将粗集口与供水口互换制成的FOF-CWC型，可获得与FOF-WCW型相同的精度。(3)在FOF-MCWCM型中，将粗收集口分为粗收集口和中收集口，实现三产品分类。针对连续多产品分类问题，通过从常规间歇式双级分级机的赤道上连续提取粗、中产品，制作了连续三产品分级机，并对其有效性进行了数值验证。此外，我们还通过实验明确了连续分类性能的标度规律

With the aim of making practicable the wet-type centrifugal classification that can very accurately classify fine particles in an almost rigidly rotating flow produced between rigidly rotating housing-and core-walls, we have studied new high-throughput multiple-product classification systems. Consequently, we have drawn the following main conclusions.1. Concerning high throughput, : we have adopted new methods of supplying feed particles and collecting products in order to increase throughput, and consequently have obtained the following main results(1) In a new FOF-WCW type in which the Ekman transport is changed inward radialy between the housing and core cylindrical walls, fine particles are surely directed to a fine product, so that high accuracy is realized.(2) In the FOF-CWC type that is made by changing the coarse collection outlets and the water supply inlet each other, we can obtain the same accuracy as in the FOF-WCW type.(3) In the FOF-MCWCM type that is made by dividing the coarse collection outlets into outlets for coarse and medium products, triple-product classification is realized.2. Concerning continuous multiple-product classification, we have made a continuous triple-product classifier by continuously withdrawing coarse and medium products from the equators of the conventional batch-type double-stage classifier, and have numerically verified the validity. Furthermore, we have experimentally clarified the scaling law of the continuous classification performance