Loop seals are among the most common non-mechanical valves used in circulating fluidized bed systems. In the present work, a fundamental study is conducted of a fluidized loop seal, which consists of a fluidized standpipe, a fluidized supply chamber, and a fluidized recycling chamber. Based on the principles of momentum, mass, and energy conservation, a hydrodynamic model for a loop seal is established, consisting of 13 equations. The effects of operating conditions such as the bottom aeration rate, total solid inventory, and fluidizing gas velocity in the riser on the solids flow rate and the performance of the loop seal are studied by a combination of model analysis and experiments. The experiments are carried out in a circulating fluidized bed with silica gel particles (Geldart group A). The model predictions show good agreement with the experimental data.

循环密封是循环流化床系统中最常用的非机械阀之一。在本工作中，对流化回路密封进行了基础研究，该密封由流化竖管，流化进料室和流化回收室组成。基于动量，质量和能量守恒的原理，建立了由13个方程组成的回路密封的流体动力学模型。通过模型分析和实验相结合的方法，研究了底部通气率，总固体存量和提升管中流化气体速度等操作条件对固体流速和环路密封性能的影响。实验在带有硅胶颗粒的循环流化床中进行（Geldart组A）。