This is entirely a "How to use a specific function of Aspen HYSYS" question.
I am working on a design for a customer that has a Depropanizer column with a large amount of C2- in the feed. Due to this C2-, I am designing the tower condenser as a partial condenser. No problem here, I've done this plenty of times.
The customer wants the tower partial condenser to be specified: vapor to liquid of product streams (note this is excluding the column reflux) is to be 50/50 ratio. Since the reflux is also considered in the column unit op specification, I cannot simply set the vapor fraction to 0.5 and call it a day. I need to add an adjust unit op the the tower to adjust the vapor fraction / vent rate / (many other specifications work here) of the tower condenser. However, I cannot find the column specifications (vent rate, vapor fraction, etc.) when I try to set an adjust unit op. Where are these located?
What I've checked so far:
(1) When I try to define the adjust unit op, I have tried looking under the "Main TS @Col#" category and there are no variables available to choose. So I tried to find these variables using a spreadsheet unit op. This worked, but I could not find the tower specifications.
I simply want to adjust the vent rate of the column condenser until a 50/50 ratio of the overhead liquid to vapor is achieved.
Any help here would be greatly appreciated. Thanks!
(EDIT) Summary: How would I add an adjust unit op to a column to adjust one of the column specifications to meet specific target? Where can I find the column specifications when trying to setup the adjust unit op?
Edited by LiveFree, 26 November 2018 - 02:04 PM.