Why does the separation efficiency sometimes decrease even when the number of simulated trays increases?
Thread Content
Simulating the conditions encountered in the atmospheric pressure column of a four-column methanol separation process, with a specified level of water in the bottom stream – I wonder if anyone has come across such a situation?
If you only adjust the number of trays while leaving the feed position unchanged, it’s equivalent to changing the stripping section and the distillation section, and such a result is inevitable
In that case, there is no change in the distillation section, the retraction section decreases, so the content of heavy components at the bottom of the tower should be lower, right?
From the top of the tower to the bottom, the maximum number of plates is at the lower part. By increasing the number of plates, doesn’t it mean that the distillation section remains unchanged while the stripping section becomes larger?
Depending on the system, the separation capacity is fixed; sometimes, if you increase the number of trays but it’s not within a reasonable range, the effect will actually be poor
It’s likely that the feeding position wasn’t optimized when there were fewer plates; therefore, by increasing the number of theoretical plates, the feeding position also needs to be adjusted accordingly. If the separation capacity still decreases, then that would be strange, haha.
Yes, when increasing the number of plates, it is necessary to adjust the position of the feed plate accordingly to ensure that the ratio between the stripping section and the distillation section remains roughly unchanged.