on a natural gas plant I have a turbo expander,
how can I simulate this unit with Prode Properties ?
Sure there are ways adopting flash operation as SPF, VPF etc.
but I would prefer a specific method which I am
unable to find in the library.
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Posted 11 February 2015 - 03:14 AM
on a natural gas plant I have a turbo expander,
how can I simulate this unit with Prode Properties ?
Sure there are ways adopting flash operation as SPF, VPF etc.
but I would prefer a specific method which I am
unable to find in the library.
Posted 11 February 2015 - 05:12 AM
with a commercial license (not the free version)
use the method PSPF() available in ppp.dll library,
it simulates compressors and expanders solving phase equilibria (vapor-liquid),
for vapor (only)select Huntington,
take care that expanding you may observe a change of phase
then the selection of base method (vapor+liquid) is preferable
Posted 13 February 2015 - 12:08 PM
Posted 14 February 2015 - 09:25 AM
Posted 20 March 2015 - 11:04 AM
thanks Paolo,
it's for a preliminary design,
is that limit (10-15%) from manufacturer's literature ?
Posted 23 March 2015 - 02:50 AM
the values may change depending from specific design,
however some standards give limits,
for example Norsok P100 (11.2 turboexpander and recompression unit) indicates, as limit, for liquid, a 20-30% weight fraction of outlet stream, in general, those are accepted values
(but see the note in my previous post)
Edited by PaoloPemi, 23 March 2015 - 02:51 AM.
Posted 06 April 2015 - 01:46 AM
as said by Paolo numbers may vary depending from application and equipment,
I think values about 5-10% are quite common,
note that since Prode Properties takes in account phase equilibria you can model also processes with flashing liquids,
for some application see
"http://www.hydrocarb...ng-fluids.html"
main limits are that model considers only H,S properties,
for a real turbine you may include all other terms in efficiency value but this may limit the range of application.
Edited by serra, 06 April 2015 - 01:59 AM.
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