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Co2 Removal - Lean Vapor Compression - Aspen Plus


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#1 stianhp

stianhp

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Posted 28 February 2013 - 07:39 AM

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



#2 Sophma92

Sophma92

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Posted 14 February 2014 - 10:32 AM

Hi :)

 

I've the same problem as you... don't know which is the best thing to do.

For a real column I would inject it directly in the boiler, because the aim is to reduce the amount of steam needed, by providing some. So it would be the last stage of the column, "on-stage".

But I'm not sure we can do that with Aspen.

 

If someone can help. Thank you






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