wierd condensation of gas

Simulate chemical processes using advanced thermodynamic models

Brought to you by: danwbr

wierd condensation of gas

Forum: Help (Classic UI)

Creator: Vincent Doucet

Created: 2021-06-03

Updated: 2021-06-03

Vincent Doucet - 2021-06-03

Hi, I have a gas (associated gas) stream that I compress and cool after compression (classic I'd say).
When cooling at 63°C I have what I would call a normal behaviour (vapour pahse mole fraction is 0.978) but if I try to go lower by 1°C (62°C) everything gets condensed ! PP is Peng Robinson.
I upgraded to version 6.5.3 (64 bits) but it is still the same.
Any idea ?
Thanks, Vincent

bug.dwxmz

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Luca Finardi - 2021-06-03

Vincent, I suggest to change thermo package to SRK.
For stream 16 I suggest to change flash spec to pres and enthalpy and for cool 2 to set calc type to outlet molar vapor fraction (eg 0.999)
Here it works and starts to have liquid at 61 °C.

Hope it helps.
Luca

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Vincent Doucet - 2021-06-03

Thanks Luca.

Changing to SRK EOS causes a phase equilibria calculation error for COMP-03 (I changed my windows regional settings to US because I had troubles in the past with French config so it should not come from that).

Changing the flash spec and the calc type seems to be ok with PR.
Vincent

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Log in to post a comment.