关键词:

两级内环流反应器, 级间构件, 气含率, 循环液速

Abstract:

Specially designed internals were used in a novel two-stage internal-loop airlift reactor to effectively decrease liquid backmixing by analogy with the tanks-in-series concept.The effects of the inter-stage internal type, superficial gas and liquid velocities and gas-liquid separator on the gas holdup and liquid circulation velocity in each stage were experimentally studied.The results showed that superficial gas velocity had a significant effect on the difference between gas holdups in the riser and the downcomer and liquid circulation velocity in the second stage (the top stage), but had a smaller effect on those in the first stage (the bottom stage).The gas holdups both in the riser and the downcomer slightly decreased with an increase in superficial liquid velocity.A mathematical model for predicting liquid circulation velocity was proposed based on the balance between driving and resistance forces, and a good agreement was obtained between the calculated and experimental data.

Key words:

两级内环流反应器, 级间构件, 气含率, 循环液速