关键词: 流态化, 振动流化床, 搅拌流化床, 超细颗粒, 供料

Abstract: The agglomerate breaking and feeding of superfine particles in a fluidized bed with 40 mm I.D. were investigated by using superfine silicon particles with 10 mm average diameter as material under addition of coarse particles, vibration and stirring force. The effects of influential factors, including vibration strength, rotational speed of stirrer, diameter and mass percentage of coarse particles, and velocity of nitrogen, on the feeding rate and the ratio of particles to gas were analyzed. With the superfine silicon particles of 10 mm average diameter, the experimental results indicated that the optimal operation conditions for the feeding in fluidized bed were obtained as follows: the rotational speed of stirrer 90 r/min, the frequency of vibration 13.9 Hz, the average diameter of added coarse particles 300 mm, and their added mass percentage 20%. Under the above conditions, the particle agglomerates can be effectively broken, slugging and channeling in the fluidized bed eliminated, and critical fluidization velocity and entrainment velocity lowered. As a result, the feeding effect of superfine particles to the bed can be obviously improved.

Key words: fluidization, vibrated fluidized bed, stirring fluidized bed, superfine particle, feeding