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Process Design Engineer Tools: To calculate the Relieving temperat temperature ure & Late Latent nt Heat Heat of Vaporization Vaporization for for Fi re case PSV PSV sizing by Shell Shell D EP meth method. od. «
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Wednesd ay, March 21, 2012 2012
To calcu calculate late the the Relieving temperature & Latent Heat of Vapor ization ization for Fire case PSV sizing by Shelll DEP met Shel method. hod.
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1 4 9 7 9 About Me
OBJECTIVE: To calculate calculate the Relieving temperature & Latent Heat of Vaporization Vaporizat ion for Fire case PSV sizing by Shell DEP method. giv es somewhat somewha t higher relieving temper temperature) ature) (This method is based on mass flow it giv es
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▼ 2012 2012 (3) (3)
HYSYS PFD: PFD developed in Asp en HYSYS
▼ March March (3) (3) ► Mar 26 (1) 26 (1) ▼ Mar 21 (2) 21 (2) More accurate Method to calculate the relieving te... To calculate the Relieving temperatur e & Latent He...
► 2009 2009 (5) (5)
1.
Methodology: Following are the steps to be followed for developing the model in HYSYS.
a.
Open HYSYS and define the stream component, Select Select fl uid packa ge then then go to si mulation environment environment and pic k a mate material rial stream from HYSY HYSYS S utili ty panel.
b.
L.K. Singh AMIChemE Whatever I have shared here on my blog that experience has com e by working with some good companies like IIP,JACOBS,IK-EPC SAMSUNG,PETROFA C. I have worked in Refinery technology development,PMC,EP C,Petrochemical C,Pet rochemical an d Refinery residual basic and Detailed Engineering,I have also worked on offshore and onshore FEED,Conceptual and Detailed Engineering projects for SHELL & Petronas company. View my complete profile
Define the stream conditions Temperature as Operating temperature and Pressure as Relieving Pressure give some mass mass flow rate let say 100 kg/hr.
c.
Once stream (14) is conversed now put a heater (E-100) downstream of material mate rial stream (14).
d.
Now define the vapor fraction of stream (17) for 5% flashing by mole if the composition basis is mole % and after that go to heater parameter and define pressure drop across heater zero, now E-100 and stream 17 is conversed.
e.
Now put an Adjuster on stream 17 to adjust vapor fraction 5% by mole basi s to convert into 5% weight weight basis .
f. g.
Now place a Fl ash drum (V-104) for flashi ng stream no 17. Define two outlet streams 15 & 16 for V-104, 15 for vapor outlet and 16 for li quid outlet from the the flash drum.
h.
If the stream stream 16 vapor fraction i s zero then then automatical automatical ly s tre tream am 16 is at its bubble point, therefore got into the properties of stream 16 and note down the mass enthalpy (-1969KJ/Kg).
i.
Now place a heater E-102 downstream of stream16 to bring the stream at its dew point.
j.
Define a heater E-102 outlet stream 18, now define the pressure drop across heat heater er zero zero and stream vapor fraction 0.00001.
http://cr azy- pr ocessdesi g neng ineer tools.bl og spot.ae/2012/03/to- cal cul ate- r el i evi ng - temper atur e.html
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6/27/2014
Process Design Engineer Tools: To calculate the Relieving temperature & Latent Heat of Vaporization for Fi re case PSV sizing by Shell D EP method.
k.
Now stream heater E-102 and stream 18 is conversed and stream 18 is at Dew point.
l.
Note down the temperature of stream 18, whi ch your reli eving temperature (194.8 deg C) at relieving pressure.
m.
Now got to the stream 18 properties note the value of mass enthalpy (-1610 KJ/Kg).
n.
Subtract the liqui d mass enthalpy (-1969 KJ/kg) from vapor mass enthalpy (-1610KJ/Kg), you will get the latent heat of vaporization 358.6 KJ/Kg.
Result: 1.
The Relieving Temperature at relieving Pressure i s 194.6 deg C. 2. Latent Heat of Vaporization is 35 8.6 KJ/Kg.
Posted by L.K. Singh AMIChemE at 3:59 AM Reactions:
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2 comments: Duy Hai December 8, 2013 at 7:59 PM Dear Mr L.K. Singh, your sharing is very useful. Could you explain for me the following, pleas e: - why define the vapor fraction of stream (17) for 5% flashing by mole? why not 3% or 10%, or a ny other values? - why we should convert the vapor fraction by mole basis to vapor fraction by weight basis? - My mass enthalpy of streams 16 and 18 doesn't different, due to very small of stream vapor fraction 0.00001. Thank you in advanced, Hai. Reply Replies L.K. Singh April 7, 2014 at 9:38 PM 5% flashing is based on Shell DEP. If we use wt percent, it gives m ore accuracy because mole bas is is a major unit. Reply
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Process Design Engineer Tools: To calculate the Relieving temperature & Latent Heat of Vaporization for Fi re case PSV sizing by Shell D EP method.
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