Is the flooding gas velocity for tower equipment the same as the operating gas velocity?
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Is the flooding gas velocity for tower equipment the same as the operating gas velocity?
The normal operating vapor velocity in a tower must be lower than the flooding vapor velocity, typically ranging from 70% to 80% of the flooding vapor velocity.
There’s definitely a difference. The flooding gas velocity refers to the speed at which the gas phase in the tower carries liquid droplets with it, preventing the liquid phase from descending properly. When flooding occurs, it leads to backmixing of the liquid phase, reducing mass transfer efficiency and disrupting normal operation in the tower. In severe cases of flooding, the liquid phase is ejected from the top of the tower. The operating gas velocity, on the other hand, is the gas velocity required for normal operation in the tower; it should generally be kept below 80% of the flooding gas velocity, with around 50% being an appropriate value.