I'm writing my master thesis as we speak and one part of it is to compare "Lean Vapor Compression" process in Aspen Hysys and Aspen Plus, CO2 removal using MEA.
I'm attaching a link if you are unfamiliar to the process which I'm referring to:
http://www.sciencedi...50583612002216#
My distillation column is operating at 2 bar. The bottom product is depressurized by a valve down to 1 atm, vapor is flashed off so a separator is necessary. The vapor from the separator is compressed up to 2 bar and the temperature reaches about 180 degree celcius. The heat is utilized in my main heat exchanger and cooled down to 120 degree celcius. Now, the compressed vapor stream is sent back to the distillation column, more precicsly the reboiler.
In Aspen Hysys you can choose which stage the stream is entering so I chose reboiler stage, no problem.
In Aspen Plus however, I am not sure which stage I should chose:
I have 8 stages in my desorber including condenser and reboiler. I can either choose "On-Stage" or "Above-Stage".
(Stage 8 is my reboiler).
My problem: Should the compressed vapor stream enter "On-Stage 8" or "Above-Stage 9" ??
Thanks for any reply
Stian