TheoreticalAnalysis of Fluidization and Mixing Behaviors in a Rotating Fluidized Bed

摘要

Particle fluidization and mixing behaviors in a rotating fluidized bed (RFB) were theoretically investigated. First of all, numerical modeling of particle fluidization behaviors in a RFB was conducted by using a coupling model of discrete element method (DEM) and computational fluid dynamics (CFD). The calculated particle fluidization behaviors showed good agreement with the actual ones, which were observed by a high-speed video camera. The estimated minimum fluidization velocity (U_(mf)) and the bed pressure drop at complete fluidization condition (triangle open P_f) by our proposed model and other available analytical models in literatures were also compared with the experimental results. It was found that our proposed model could predict the Umfand triangle open P_f with a high accuracy because our model precisely considered the local downward gravitational effect, while the other analytical models overpredicted the triangle open P_f due to ignoring the gravitational effect. In addition, particle mixing behaviors in the radial direction were also theoretically and experimentally analyzed by using a degree of particle mixing. Accordingly, the experimental results showed good agreement with the calculated ones. Effects of the operating parameters such as gas velocity and vessel rotational speed on particle mixing behaviors were also analyzed.