Oil and Gas - Condensate Flash Off

[AreJay]

Offshore we have a vessel which is taking condensate and allowing a certain volume and composition of gas to flash off and be vented (see attached - vessel in question is the liquid/gas vessel in the middle)

In the office our HySys is not working at the moment and i need to calculate the volume of gas that would be flashed off from the vessel. Vessel pressure is 38 bar and the temperature is 62DegC. I have also shown the compositon of the condensate in the attachment.

Can anyone help me with this issue?

Thanks

 

[dcasto]

I'd do a simple balance. Assume you have 100 moles of feed mixture. The next to the last colum says that of that 100 moles, there are .66 moles CO2 and .09 Moles of N2 and 8.26 moles C1. Well, that means that there are 9.01 moles coming in and we know that virtually none of those moles make it to the liquid. Therefore, ther must be 9.00 moles of those flowing into the gas. We know that the gas is 23.27% of the stream, therfore 9/23.27% is 38.67 moles as the total vent gas stream and that means the liquid is 62.33 moles.

Do the same technique on a mass basisif you want.

 

[PaoloPemi]

if VLE is that of compositional analysis you have the solution.
If VLE is required at some different p,t then you need to solve a isothermal (or may be a adiabatic) flash, for that you don't need a simulator which may be (in general) complex to utilize, Excel with a little library can provide all what you need.

 

[MortenA]

I have to say this: Eng-tips are not a free consultantcy. We (or at least I) will help you solve the problem - but not provide free services. Also - consider how you will explain this if you get bad advice - some dude at a discussion forum said....

IMHO: Contact a professional consultant if you cannot get the final result yourself or in-house.

Best regards

Morten