Internally circulating fluidized beds (ICFBs) enable effective control of the reactions and heat distribution in reactors. The ICFB contains two or more connected fluidized regions with different gas velocities to promote controlled solid circulation. The control of solid circulation rate (G₀) is a critical factor. We recorded single particle trajectories by tracing a fluorescent particle, based on which particle flow behaviors were analyzed in different regions. G₀ was obtained for a wide range of operating parameters. An increase in gas velocity in the down- and upflow beds shortened the particle circulation time in both beds and G₀ increased significantly. As the static bed height increased, the differential pressure on both sides of the circulation port increased, which resulted in an increase in the solid circulation rate. As the orifice area increased, the flow resistance through the orifice decreased and thus the solid circulation rate increased. G₀ increased with the decrease in particle size. The gas velocity in the upflowing bed and orifice area was the most important parameter to control the solid circulation rate. G₀ was compared with the experimental measurements in literature and predictions using the correlation based on Bernoulli’s equation, and they agreed well.

内部循环流化床（ICFB）可以有效控制反应器中的反应和热量分布。ICFB包含两个或多个连通的流化区域，它们具有不同的气体速度，以促进受控的固体循环。固体循环速率（G ₀）的控制是关键因素。我们通过追踪荧光粒子记录了单粒子的轨迹，基于该粒子在不同区域的流动行为进行了分析。对于广泛的工作参数，获得了G ₀。上下气流床中气体速度的增加缩短了两个气流床中的颗粒循环时间，G ₀明显增加。随着静态床高度的增加，循环端口两侧的压差增加，从而导致固体循环速率增加。随着孔口面积的增加，通过孔口的流动阻力减小，因此固体循环速率增加。G ₀随着粒径的减小而增加。上流床和孔口区域的气体速度是控制固体循环速率的最重要参数。使用基于伯努利方程的相关性，将G ₀与文献和预测中的实验测量值进行了比较，它们很好地吻合。