June 2017

Special Focus: Process/Plant Optimization

CFD study of mixing performance of redistribution systems for packed columns

The maldistribution of liquid flow within long packed beds is a well-known phenomenon in distillation and absorption columns. In a packed column, the maldistribution of liquid results in differences in liquid concentration across the column.

The maldistribution of liquid flow within long packed beds is a well-known phenomenon in distillation and absorption columns. In a packed column, the maldistribution of liquid results in differences in liquid concentration across the column. Therefore, a liquid redistribution system used within a long packed bed must serve two primary functions: the equalization of liquid flow, and the equalization of liquid concentration. FIG. 1 shows a standard redistribution system, which consists of a packing support, a liquid collector and a liquid distributor. In addition, a downpipe with a ring channel, or sometimes a dedicated mixing drum, is used between the collector and the liquid distributor to e

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