加压流化床流化性质的实验与模拟研究

The behavior of particles and bubbles in a twodimensional jetting fluidized bed included in a pressured vessel was investigated experimentally by using the CCD camera technology that can detailedly record the behavior of bubbles. EulerianEulerian model was used to simulate the hydrodynamics of a pressurized jetting fluidized bed with a central jet and Vshaped distributor. The influence of gas velocity on the size of bubble, bed expansion ratio and jet penetration height at higher pressure was studied. Both experimental and simulation l results clearly indicate that the jet height decreases and the bubbles become more round when the gasvelocity of distributor is increased at higher pressure. When the jetting gasvelocity is increased, the jet height increases and the bubbles become slender. It has been verified that the result from hydrodynamic model shows a good agreement with experimental data, which suggests that the model can be used to study the fluidization properties in the pressurized fluidized bed.