超细粉体分级填料塔的结构设计

Structure design of super-fine powder classification tower with structured packing

从气固流态化原理出发介绍了分级填料塔的工作原理,借助波纹填料塔的一些计算方法,进行了超细粉体分级填料塔的结构设计.固体颗粒由于颗粒大小的不同,其重量亦不同,使其上升的曳力亦不同,故在固定风速下,不同粒径的颗粒在分级填料塔内由上至下实现分层,团聚的颗粒受到填料的不断冲击而达到分散,提高了整体的分级效果.将该设备用于固体颗粒的分级,取得了显著的分级效果,展现了广阔的应用前景.

The principle of gas solid fluidization and classification towers are introduced. Based on the calculation method of structured packing towers, the structure design of a classification tower with structured packing was made. Solid particles are separated into different fractions based on there size. Usually, there are three main important forces acting on particles in a classification tower： gravity, flotage and dragging force. If the particles are small, the flotage and dragging force will predominate and more particles with the air stream will go into the fine fraction. If the gravity of particles is greater than the flotage and dragging force, particles will deflected into the coarse fraction. As a result, the coarse fraction were went into the lower part of the tower, the reunited particles were distributed when they collided with structured packing, thereby, the classification towers has a ideal classification effect. It is demonstrated that the classification tower has a ideal classification capability from experiments.