Abstract: In an S type vertical sieve tray fluidized bed, a study on cold model experiment of the behavior of gas-solid fluidization was carried out, using FCC catalysts and room air as the fluidizing medium. The impacts of parameters such as the gas velocity of tray hole, the solid circulation volume and the cap structure on the tray pressure drop and particle lift rate through caps were investigated, and particle lift rate through caps was measured with self-developed particle lift rate collector. The results showed that：the bed pressure drop increased with the gas velocity of tray hole and the cap bottom gap height increasing, and decreased with the tray hole diameter, the hole diameter and opening rate of caps increasing. Particle lift rate through caps increased with the increases of tray hole gas velocity, the solid circulation volume, the tray hole diameter and the cap bottom gap height, and decreased when the cap hole diameter increased to a certain point.

Key words: S type vertical sieve trays, gas-solid fluidized bed, pressure drop, particle lift rate through caps

摘要： 在S型垂直筛板流化床中，以FCC催化剂和空气作为流化介质，对垂直筛板流化床的流化性能进行冷模实验研究，考察了板孔气速、固体循环量和帽罩结构对床层压降和帽罩提升量的影响，用提升量收集器测量帽罩提升量。实验结果表明，床层压降随板孔气速和帽罩底隙高度的增加而增加，而随塔板开孔直径、帽罩开孔直径和开孔率的增加而下降。帽罩提升量则随板孔气速、固体循环量、塔板开孔直径及帽罩底隙高度的增加而增加；随帽罩开孔直径的增加，提升量先增加后下降。

关键词: 垂直筛板, 气固流化床, 压降, 帽罩提升量