中文摘要：

针对组合约束型提升管反应器工业应用中的零床层操作模式，在一套大型冷模实验装置上，研究了零床层操作下提升管出口区域的颗粒速度分布，考察了表观气速、颗粒循环强度等条件的影响，并与“提升管＋床层”耦合操作进行了对比．结果表明，气固两相沿提升管轴向靠近出口的过程中，受出口分布器约束影响，颗粒向上运动到出口区后速度呈降低趋势，约束影响的长度随表观气速增加而减小；随颗粒循环强度增加，出口区截面中心颗粒速度增加，边壁颗粒速度降低，且变化幅度均大于轴向其它位置；随表观气速增加，出口区截面各局部位置颗粒速度均增加，在相同的表观气速增量下，低气速操作时出口区截面局部颗粒速度增量小于其它轴向位置，高气速操作时出口区截面局部颗粒速度增量大于其它轴向位置；与“提升管＋床层”耦合操作相比，零床层操作时出口区截面中心颗粒速度较高，边壁颗粒速度较低，径向分布均匀性较差．

英文摘要：

According to ＇zero-bed＇ operation mode of combination of constraint riser reactor in commercial unit, in a largescale cold mode experiment device, we have studied the distribution of particle velocity in exit zone of riser in ＇zero-bed＇ operation mode and the effects of superficial gas velocity, particle circulation strength and other conditions. The results were compared with the one of risered coupled operation mode. Affected by the distributor, particle velocity has a decreasing trend and the length of the constraint effect decreases with the increase of the superficial gas velocity as the gassolid flow approaches to the exit ofthe riser. With the particle circulation strength increasing, the exit zone section particle velocity increases in core region and decreases in wall region. The amplitude of variation is greater than the other axial positions. With the superficial gas velocity increasing, the exit zone section local particle velocity increment is less than other axial positions under low gas velocity operation and is larger than other axial positions under high gas velocity operation. Compared with the riser-bed coupled operation, in the ＇zero-bed＇ operation mode, the exit zone particle velocity is large in core region, but small in wall region. Radial distribution of particle velocity uniformity is poor.