Opening issue of the feed distribution pipe inside the tower
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When designing the feed distribution pipes inside a tower, what are the requirements regarding the number of openings? Please explain these requirements separately for the liquid phase, the gas phase, and the gas-liquid mixed phase. Thank you!
I believe that, while meeting the requirements for flow rate and speed, it is necessary to ensure even distribution and coverage of the entire reaction area.
The total area of the openings shall be no less than the cross-sectional area of the feed.
This issue is quite complex; the situation is different for packed towers and plate towers. It is recommended to consult the book \"Comprehensive Book of Chemical Engineering Equipment: Tower Equipment\", which provides relatively detailed explanations.
We follow the same approach as that on the 3rd floor, in cases where no requirements are specified for the process. For these components of ordinary towers, the required dimensions are already specified for us; we just need to create a drawing based on those dimensions
What needs to be calculated is related to the pipe diameter; flow rate also needs to be taken into consideration
Liquid distributors are widely used in packed towers. From the perspective of the equipment, it is generally assumed that the total cross-sectional area of the tower is roughly equal to the area of the inlet pipe. However, the condition diagrams provided for the equipment in standard processes usually specify the distribution method (including the size and spacing of the openings). From a process perspective, for packing towers with a diameter of 600 mm or less, a pellet-type distributor can be used. For tubular distributors, it is generally necessary to consider having more than 30 spray points per square meter of tray ； For towers under high vacuum with relatively large packing dimensions, more than 45 spray points per square meter of tray should be considered.
The porosity is primarily determined by the flow rate of the liquid and the efficiency of the filler
Choose according to the spray density specified in the process
For liquids, a branched pipeline is generally sufficient. Gases can be distributed using a gas distributor, which is simply a tube with one or two rows of holes at the bottom. Vapor-liquid mixtures are more troublesome; sometimes a semi-tube distributor is used.
If the distribution is poor, it can have a significant impact