Why are the distillation column component curves flat on most trays?
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By reviewing some literature, it was found that on most of the trays in many distillation columns, the composition curves of the distillate are flat; doesn’t this mean that most of these trays fail to achieve separation? Are there other reasons? Please share your opinions! Thank you!
Yes. The influence of feed position, number of trays, etc. on the separation efficiency can be observed through such a component-tray diagram
Reply to 2# hu688, Teacher Hu: Does this situation mean that there are extra trays in this tower, which can be removed?
Reply to 3# superchenlei: I guess so. Some of the flat trays in the diagram can be cut out. Then it can be seen how many boards are suitable.
This post was last edited and replied to by hu688 on 2010-8-14 at 11:22. Reply 3# superchenlei: Yes, it is possible to reduce the number of trays until the curve transitions smoothly without any abrupt changes
If the curve is relatively flat, it is possible to reduce the number of trays appropriately, thereby lowering costs and energy consumption
I think it’s a problem with the precision of the decimal places set when defining the curves. For example, the nitrogen purity at the top of the lower column can reach the ppm level, and the changes in the temperature across the upper trays are very small; if the curve you draw in that area is close to the top, it will definitely appear as a straight line
Thank you to all the teachers for their guidance; I am extremely grateful