加压气升式内环流反应器流动特性

在连续进料的操作条件下，选用水、氮气等作为实验介质，在Φ600mm?000mm的耐压不锈钢环流反应器内进行了实验。获得了下降环隙以及中心导流筒气含率的实验数据，并根据所获得的实验数据给出了中心导流筒以及下降环隙的关联式。从能量衡算的角度出发，对中心气升式加压环流反应器进行了理论分析，根据能量平衡推导出了连续操作模式下液相循环速度模型。同时根据实验所获得的数据确定了模型参数，通过计算可以发现，循环液速会随空塔气速以及体系压力的增加而增大，但是液相循环速度不会随着这两个操作工况无限制的变化，当体系压力与空塔气速大于某个值之后，液相循环速度的基本趋于平缓

Local flow characteristics in pressurized internal air loop reactor

The flow characteristics of a 600 mm×6000 mm pressurized internal airloopreactor was studied. During the experiment the liquid superficial velocity in the draught tube was fixed at 0.008 m·s^-1,gas superficial velocity ranged from 0.02 m·s^-1 to 0.12 m·s^-1, pressure of the reactor varied from 0 to 2.0 MPa.Local gas holdup in the draught tube and annual space was measured and correlations for these parameters were obtained.Meanwhile, the model of liquid circulation velocity on the basis of the energy balance analysis in the reactor was derived.Reasonable agreement was found between the calculated and measured data.From the model and experiment data,it was easily found that liquid circulation velocity increased with increasing gas superficial velocity and system pressure, however when gas superficial velocity and system pressure exceeded respective critical values, liquid circulation velocity increased only gently.