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Packed tower design is based on the fundamental concept of equal liquid and gas superficial velocity across the column section. The pressure drop across the packing provides an impetus for the upward flowing gas to become uniformly distributed across the column area. The liquid flows down the packed bed as a result of gravity and unlike a gas, the liquid has poorer cross-mixing tendencies. It is therefore imperative to manage and ensure uniform liquid distribution at the top of the bed.
Distributors are internals installed above a packed bed, which perform the job of providing a finite liquid distribution over the packed bed. A distributor allows the liquid to be distributed over the packed bed in discrete streams. This can be done either through orifices or V-weirs located on/in the distributor. Distributors also provide a separate passage for the upward flowing gas.
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