关键词: 垂直筛板, 气固流化床, 压降, 帽罩提升量

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