关键词: 耦合流化床反应器, 提升管, 颗粒速度分布, 颗粒滑落系数

Abstract: The axial and radial distributions of particle velocity in the riser of a cold model setup, a compound reactor mainly composed of riser and fluidized bed, were investigated by optic fiber probe. The experimental results showed that under a certain superficial gas velocity, the average cross-sectional particle velocity reduced with the increase of circulation intensity; at similar circulation intensities, both the axial and radial particle velocities increased with the increase of superficial gas velocities. Due to the existence of a gas-solid dense phase fluidized bed at the riser exit, the axial particle velocity distributions appeared the tendency of increasing with the bed high firstly then gradually decreasing. Furthermore, an empirical model for particle slip coefficient in riser was established based on the experimental data and theoretical analysis, and the calculated values were in good agreement with the experimental data.

Key words: compound fluidized bed reactor, riser, distribution of particle velocity, particle slip coefficient