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Converging Cryogenic Air Separation In Hysys


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#1 rgc1994

rgc1994

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Posted 22 March 2017 - 03:46 PM

Hello, I am having trouble trying to converge a Linde double column arrangement in Hysys. Since I have linked the common heat exchanger between the HP and LP columns I am unable to converge the LP column aiming to achieve 99% LOX. I have tried changing solvers, changing many specifications and adding balance blocks to no avail. I have noticed several simulations of ASUs have been posted on the site but most are incomplete so I have no solid reference flowsheet. Any advice and help on converging my simulation would be massively appreciated. Thanks.

 

I have attached the hysys file as .xml so it should open in most versions

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#2 rgc1994

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Posted 22 March 2017 - 03:59 PM

This attachment is the converged flowsheet before a common cond/reb is added, where clearly the duties are not equal

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Edited by rgc1994, 23 March 2017 - 06:16 AM.


#3 stratovona266

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Posted 19 January 2018 - 01:32 PM

Do you guys happen to have a a cryogenic air separation unit model that only produces oxygen?



#4 EdenHuang

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Posted 12 June 2018 - 07:24 AM

Hello, I am having trouble trying to converge a Linde double column arrangement in Hysys. Since I have linked the common heat exchanger between the HP and LP columns I am unable to converge the LP column aiming to achieve 99% LOX. I have tried changing solvers, changing many specifications and adding balance blocks to no avail. I have noticed several simulations of ASUs have been posted on the site but most are incomplete so I have no solid reference flowsheet. Any advice and help on converging my simulation would be massively appreciated. Thanks.

 

I have attached the hysys file as .xml so it should open in most versions

Would like to share your experience in converging this problem? I also found that the duties of reboiler of LP and condenser of HP column have a relatively large difference. 






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