Study of Powder Compacting Effect in the Rotor Fluidized Bed used for Granulating and Powder Coating by using DEM Computer Simulation

摘要

Rotor fluidized beds are used widely for granulation and particle-surface coating in various industries. Comparing with conventional fluidized beds, they can produce more spherical granules with high density by the action of the rotor. The air flow pattern in the device changes largely due to the interaction of the inlet air and the rotating rotor, which differs from the conventional fluidized bd granulators. By the various conditions of particle fluidization, we can produce various granule properties. This kind of device widens the range of control of the granule's physical properties. On the other hand, the number of parameters to be considered increases. Observation of the movement of powder and the air flow patern in the device is difficult or requires complex machines. Logical and analytical reports on the correlation among granule's physical properties are very few. So, we applied DEM simulation method to estimate the particle's flow characteristic in this device numerically. The particle's flow in the device was analyzed under several rotor rotating speeds values as an operation parameter. We studied the relationship between the physical properties of the particles actually produced by the rotor fluidized bed device, especially granule's bulk density and the simulated particle's flow.