Phase envelope
Phase envelope
(OP)
I am getting strange results when printing a phase envelope of a natural gas mixture from our simulator (package Peng Robinson), when I add 6% H2S to a C1 60% C2 11% C3 C4 C6 C8 N2 CO2 the dew and bubble lines don't connect but go up and down in a strange fashion, also I am not able to get the dew point specification. The software house says it's the charateristic of the mixture but it's the first time that I observe this behaviour in a natural gas mixture and I would appreciate comments from experts here.





RE: Phase envelope
http://www.prode.com/en/phaseenvelope.htm
If the software house says the procedure works well I would presume they have verified that, you shouldn't forget that in general it isn't simple to duplicate a result with a different simulator because of differences in databases, interaction parameters and models (for example I know at least 10 variants of Peng Robinson...),
Paolo
RE: Phase envelope
I didn't suppose that the addition of 6% H2S could generate that complex behaviour, I found several papers of Michelsen discussing phase equilibria with several examples and many of these examples do include H2S,
a interesting reading,
Alfonso
RE: Phase envelope
Of course I am prepared to learn from others which use different methods,
Paolo
RE: Phase envelope
RE: Phase envelope
RE: Phase envelope