Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

Distillation (Coal Tar) In Aspen Plus - Design Problem


This topic has been archived. This means that you cannot reply to this topic.
4 replies to this topic
Share this topic:
| More

#1 crazyleg

crazyleg

    Brand New Member

  • Members
  • 3 posts

Posted 28 March 2014 - 09:13 AM

Hello!

 

I've got my hands on Aspen Plus and trying to simulate coal tar distillation column, which I have at the factory I am working at. Just curious if is it possible to get more/less same results in Aspen as real world data. I am a scientist, not an engineer, so please forgive my question.

 

Basically, the column I am trying to simulate is a 50 stage packed column with input and 5 fractions. 3 middle fractions are taken as a liquid. Top fraction is taken as vapor, then cooled to ambient temperature and part of it is used for reflux. Bottom fraction has no reboiler/heating, so bottoms are just taken at constant rate as liquid.

 

What I am trying to use at ASPEN RadFrac column is condenser=none, reboiler=none. I manually add cooler and splitter to do a reflux on the top stage, so it is clear. But basically ASPEN demands to have some kind of reboiler. It can be reboiler incorporated in RadFrac or a pump around or a Heater/Splitter going bottom stage. 

 

But physical column I am trying to simulate has no reboiler at all! I can't find a way to force ASPEN to accept it. And ASPEN of course is right. There has to a reboiler normally, but we have what we have. 

 

What's the way to program this kind of simulation ?

 

Best regards,



#2 PingPong

PingPong

    Gold Member

  • Members
  • 1,446 posts

Posted 28 March 2014 - 02:12 PM

I use PRO/II, not Aspen, so I have to guess.

 

Maybe you selected the wrong column from the template?

 

Or you forgot to add stripping steam to the bottom stage of the column?

 

A column cannot have trays below the feed, but without vapor from a reboiler, or stripping steam, or another vapor stream to the bottom stage.

 

What I am trying to use at ASPEN RadFrac column is condenser=none, reboiler=none. I manually add cooler and splitter to do a reflux on the top stage, so it is clear.
That is an inefficient way of modelling the condensor. Your column does have a condensor specify it as such to avoid possible convergence problems.

#3 crazyleg

crazyleg

    Brand New Member

  • Members
  • 3 posts

Posted 01 April 2014 - 02:30 AM

Thank you!



#4 Mohamed Hussein

Mohamed Hussein

    Brand New Member

  • Members
  • 2 posts

Posted 04 April 2014 - 11:11 AM   Best Answer

Dear,
i have worked on such a project, you should use PetroFrac for your purpose.



#5 crazyleg

crazyleg

    Brand New Member

  • Members
  • 3 posts

Posted 07 April 2014 - 03:07 AM

Thanks, that's the case! 






Similar Topics