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Aspen Hysys Calculation Of Standard Liquid Voumetric Flow Rate For Ngl

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#1 Vegeta


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Posted 12 April 2020 - 04:06 AM



I am simulating a propane stream in the NGL plant and I have the following question: 


How does Aspen HYSYS calculate the standard liquid volumetric rate of the low boiling point liquids i.e. at what temperature and pressure? 


I have been using Aspen HYSYS for more than 3 years and I'm used to reference the standard liquid volume to 60 °F and atmospheric pressure.  However, this has been my first time to deal with low boiling point liquids. The liquid propane boils at -44 °F at an atmospheric pressure.  So, it shall be vapor at 60 °F.  The HYSYS results are not inline with this as follows (as an example): 


Mass flow rate = 102175 lb/h

Density at -44 °F (and 30 psig) = 36.4 lb/ft3

Actual volumetric rate at -44 °F (and 30 psig) = 2807 ft3/h

the standard volumetric rate of the same stream by HYSYS = 3211 ft3/h

This corresponds to a density = ~31.8 lb/ft


However, there is no way the stream is liquid at 60 °F and atmospheric pressure.  Am I missing something here? 


Your help is appreciated...







#2 Bobby Strain

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Posted 12 April 2020 - 09:25 AM

You need to find the definition for standard liquid volume. It's not the same condition as gas volume at STP.



#3 breizh


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Posted 12 April 2020 - 09:30 PM

http://users.rowan.e...ty packages.pdf


Consider this resource to support your work .

Good luck


#4 Vegeta


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Posted 13 April 2020 - 02:29 AM

Thanks Bobby and Breizh...


The answer is in the pages 55 to 59. 




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