缩放型导流筒气升内环流反应器液体循环速度的研究

Liquid Circulation Velocity in Internal Loop Airlift Reactor with a ConvergenceDivergence Draft Tube

研究气升式内环流生物反应器液体循环速度，分别采用一种传统圆柱型导流筒和三种不同结构参数缩放型导流筒，试验条件分别为空气－水和空气－ＣＭＣ两相系统以及空气－水－树脂三相系统。试验结果表明，对于空气－水和空气－ＣＭＣ溶液两相系统以及空气－水－树脂三相系统，液体循环速度随通气速率提高而增大；在同一通气速率情况下，圆柱型导流筒反应器液体循环量大于缩放型导流筒反应器；对于空气－ＣＭＣ溶液两相系统，随着介质粘度增加，液体循环速度下降；对于空气－水－树脂三相系统，随着固含率增加，液体循环速度下降。在全环路能量衡算基础上，建立空气－水两相系统条件下液体循环速度数学模型。

Liquid circulation velocity of an internal loop airlift reactor was studied.The bioreactor consists of one conventional draft tube and three convergencedivergence draft tubes.Experiments were performed with airwater and airCMC solution twophase system and airwaterresin particle threephase system.It was shown that liquid circulation velocity increases with the increasing of gas velocity.At the same superficial gas velocity,liquid circulation rate for airlift loop reactor with different convergencedivergence draft tubes is obviously lower than that for airlift loop reactor with a conventional draft tube.Liquid circulation velocity decreases with the increasing of CMC solution viscosity in airCMC solution twophase system and with the increasing of resin particle loading in airwaterresin particle threephase system.Based on an energy balance over the loop,a mathematical model was derived to estimate liquid circulation velocity in the riser and in the downcomer for airwater twophase system.The value pre