三相气升式内环流反应器的流体力学性能

从气含率、循环液速、停留时间分布等方面研究三相气升式内环流反应器的性能。结果表明:气含率随着表观气速、固含率的增大而增大；在低气速下，固含率对气含率的影响较大；在高气速下，固含率对气含率的影响比较小。在大量实验数据的基础上通过拟合得到预测气含率的经验关联式，且预测值与实验值吻合较好。基于推动力与阻力平衡建立了预测反应器循环液速的数学模型；用脉冲示踪法得到反应器的停留时间分布函数曲线，并通过计算得到了平均停留时间、停留时间分布方差、无因次方差等，得知此反应器接近全混流型反应器。

HYDRODYNAMICS PROPERTIES OF A THREE-PHASE AIR-LIFT INTERNAL-LOOP REACTOR

The hydrodynamics in a three-phase air-lift internal-loop reactor were studied in terms of gas holdup, liquid circulation velocity and residence time distribution. The results showed that gas holdup was increased with superficial gas velocity and solid holdup. The solid holdup played an important role in gas holdup at lower superficial gas velocity, whereas the solid holdup had a little effect on gas holdup at higher superficial gas velocity. On the basis of lots of experimental data, the experienced correlation for predicting gas holdup was obtained. The predictable values of gas holdup were well fitted with its experimental values. A mathematical model for predicting liquid circulation velocity was proposed in terms of the balance between driving and resistance forces. The curve of residence time distribution function was gained by using pulse chasing method, and it was known that the reactor had approached completely mixing reactor in terms of computing mean of residence time, dimension and dimensionless variance of residence time distribution and so on.