关键词: 循环流化床, 上行气固两相流, 流动行为, 相似性

Abstract: Hydrodynamic similarity of particle flow behavior in the fully developed region of upward gas-solid CFB riser was experimentally investigated.The experiments were carried out in a 15.1 m high and 100 mm i.d. CFB riser with FCC catalyst particle, and the axial pressure gradients, local solids holdups and particle velocities were measured over a wide range of operating conditions. Through extensive analysis and comparison of particle flow behavior, it was found that the cross-sectional average solids holdups in the fully developed region changed linearly with the number group of (G_s/ρ_p)^1.2/U^2.0_g, although G_s and U_g showed different effects on particle flow.It was also showed that with different operating conditions, if the value of (G_s/ρ_p)^1.2/U_g^2.0 was the same, the local solids holdups, particle descending velocities, solids concentrations inside cluster and cluster frequencies displayed the same spatial distributions, respectively.The research indicated that the number group(G_s/ρ_p)^1.2/U^2.0_g makes the effects of G_s and U_g combined, and with the same (G_s/ρ_p)^1.2/U^2.0_g, the particle flow behavior in the fully developed zone of upward gas-solid two-phase flow exhibited very similar micro and macro hydrodynamic characteristics.

Key words: 循环流化床, 上行气固两相流, 流动行为, 相似性