Abstract: The bubble size and its distribution has been studied in three-phase circulating fluidized beds by using the newly developed fiber optic probe system systematically. The experimental results show that the distribution of the bubble size can be described by the lognormal distribution function. The mean bubble size in the center region of the fluidized bed is smaller than that in the region near the reactor wall. The mean bubble size decreases with the superficial gas velocity and increases with the particle-circulating rate. The superficial liquid velocity has almost no effect on the mean bubble size.

摘要： 用光纤探头技术对三相循环流化床中的气泡大小及其分布进行了系统研究 ,实验测定了操作条件对气泡大小及其分布的影响规律 .实验结果表明 ,三相循环流化床中气泡的大小分布可用对数正态分布表征 ,在实验条件下气泡平均直径在床中心区域较小且沿半径方向由中心向边壁逐渐增大 ,并随表观气速的增大而减小 ,随固含率的增大而增大 ,表观液速对气泡平均直径的影响较小