Experimental and numerical studies on fluidization properties in a pressurized fluidized bed

摘要

Experimental studies were carried out to investigate the behavior of particles and bubbles in a two-dimensional pressurized jetting fluidized bed. Experimental data were obtained by visualized image of the bubble using the CCD camera technology that can detailedly record the behavior of bubbles, then, were analyzed. A "two-fluid" (gas and solid phases), Euler-Euler model was developed to simulate the hydrodynamics of a pressurized jetting fluidized bed with central jet and a V-shaped distributor. The influence of pressure were studied on the size of bubble, bed expansion ratio and jet penetration height. Both experimental and theoretical results clearly indicate that the pressure has different effects on the bubble produced by the velocity of jetting and distributor. The jet height decreased with increasing pressure and gas velocity of distributor. It has been verified that the hydrodynamic model shows a good agreement with experimental data, which makes this model a useful tool to study the fluidization properties in the pressurized fluidized bed.