Why is the opening ratio of the desorption tower larger at the bottom than at the top?
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The porosity at the lower part of the desorption tower is over 6%, while it’s over 4% at the upper part; solve this!
I wonder if you know about the concept of overall tower air velocity? Lowering the pressure is to ensure a certain space velocity in the gas phase!
The amount of vapor decreases as one goes higher; in most distillation columns, the porosity also decreases as one moves upward.
Does the opening ratio of the stripping tower increase as it goes higher? Please clarify
The stripping tower has only 6 trays, which is roughly equivalent to one theoretical tray; it can be considered as a flash vessel. In the entire tower, the vapor phase becomes larger as one moves upward, but the deviation between the upper and lower sections is less than 0.5%; some water still enters the liquid phase in the diesel stripping tower, and the opening ratio of the stripping tower remains the same throughout.
Simply put, it is necessary to maintain a certain velocity of the gas-phase components in order to ensure effective mass and heat transfer at each tray in the tower.
The towers chosen for design are now much larger than theoretically required, and this difference is not noticeable. If the porosity is affected, then it would be necessary to consider replacing the entire tower.