环形喷动床颗粒混合特性实验研究

modified spouted bed, viz. annular spouted bed, was developed to offset the deficient mixing characteristics of the conventional spouted bed. Experiments were performed to test mixing characteristics in this device. The influence of air velocity and hold up as well as particle size on mixing has been investigated. Experimental results show that the annular spouted bed has nicer mixing characteristics in terms of both mixing speed and final degree of deviation. The mixing speed increases significantly with increasing air velocity, especially in axial. The hold up has a strong effect on the final degree of deviation. With the increasing of hold up the axial final degree of deviation decreases firstly, then increases. The lateral final degree of deviation decreases with the increasing of hold up. Particle size has slightly effect on mixing speed, and the less particle size is, the more mixing speed is. Adding rotating cone greatly improved lateral particle mixing. The improved structure reduces the difference between axial particle mixing and lateral particle mixing.