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Modeling Turboexpander With Prode Properties

turboexpander modeling prode properties

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#1 frpe

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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.



#2 PaoloPemi

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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



#3 frpe

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Posted 13 February 2015 - 12:08 PM

thanks Paolo,
actually there is a Joule Thomson valve,
yes, there is condensation (heavy components)


#4 PaoloPemi

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Posted 14 February 2015 - 09:25 AM

>yes, there is condensation (heavy components)
 
the method PSPF() in Prode Properties can model (rigorously with a EOS) an expansion including phase equilibria (vapor-liquid),
the procedure is similar to the compressor (which solves a polytropic stage including phase equilibria).
 
with std. design a low amount of liquid (up to 10-15 %) in turbo expander outlet is not a problem,
anyway you may wish contact the manufacturer to verify the project.


#5 frpe

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Posted 20 March 2015 - 11:04 AM

thanks Paolo,

it's for a preliminary design,

is that limit (10-15%) from manufacturer's literature ?  



#6 PaoloPemi

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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.


#7 serra

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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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