Residence time of materials in the tower
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May I ask the experts how to calculate the residence time of materials inside a tower? For example, for the feed to a vacuum tower, what is the residence time of the materials within that tower? The section where there is a liquid level should have its volume calculated as the total volume of that section minus the amount discharged. But how is the volume calculated for the section from the inlet to the point where there is a liquid level? What about the stripping tower?
The calculation of the material volume inside the tower is quite complex. It can be estimated using the method below. For the liquid phase: it is necessary to know in advance the size of the downcomer, estimate the height of the liquid level in the downcomer as well as the height of the liquid level on the tray, calculate the total amount of liquid on each tray, and then determine the mass of liquid on each tray based on the density of the medium.