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Simulation Of Diesel Stripper


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#1 gupta_manoj

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Posted 30 July 2007 - 01:48 AM

Hi dear,

I am practiceing on HYSYS and trying to converge a Diesel Stripper, I could not suceed I want to know which model should i select for simulating Stipper.

Hope some of u will help me.

Regards

Manoj

#2 Zauberberg

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Posted 30 July 2007 - 04:54 AM

Gupta,

Please provide more information, such is:

- Diesel stream characterization parameters that you used
- Fluid package
- Stripper type (reboiled or steam-stripped) and configuration
- Convergence parameters
- Feed type: is diesel defined (within flowsheet) as liquid on its boiling point?

If you could provide as much of these parameters, maybe we can be of more help to you.
Regards,

#3 gupta_manoj

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Posted 07 August 2007 - 06:51 AM

Zauberberg,


feed is at 265 oC temperature and 7 kg/cm2g pressure and flow 280tons/hr two phase( 8wt% vapor)
fluid package is SRK, Steam Stripped(mp steam) and variable dia column,
convergence parameter bottom product 250 tons/hr

due some constraints I cannt disclose more data,

waiting for reply

regards

#4 Milutin

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Posted 07 August 2007 - 07:30 AM

QUOTE (gupta_manoj @ Jul 30 2007, 01:48 AM) <{POST_SNAPBACK}>
Hi dear,

I am practiceing on HYSYS and trying to converge a Diesel Stripper, I could not suceed I want to know which model should i select for simulating Stipper.

Hope some of u will help me.

Regards

Manoj



If you simulate simple steam stripped stripper you should use ABSORBER model, if you have stripper with reflux you should use REFLUXED ABSORBER model.


Regards,

Milutin

#5 Zauberberg

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Posted 07 August 2007 - 12:28 PM

1) Stripper feed should be specified or pre-calculated as bubble-point liquid, regardless of the service being simulated. Is this ADU or HDS/HT diesel stripper?
2) Bottoms flowrate is usually not very reliable convergence specification parameter. Try to use stage temperatures or reflux rates (if there is any). Once the model has converged it is much easier to play with further simulation options.

Regards,

#6 Milutin

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Posted 07 August 2007 - 01:40 PM

Hi Zauberberg,

According to pressure and vapour present in feed it is HDS stripper.


Regards,

Milutin

#7 smalawi

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Posted 11 August 2007 - 03:36 PM

Hi,

the case is not clear here, you are stripping what from diesel? is it the light ends you need the light ends analysis done to mix it with the reundown diesel to make your feed. usually one try to simulate an entier fractionator column rather than just stripper. for jst stripper just use the absorber model as stated above.

with hysys use Peng Robenson and i personally find lee kesler energy equation better than the equation of state for heavy hydrocarbons. so depndin gon the diesel end point one should decide. you can solve the case with one model and change to the other to copare.

you need gravity and distillation done for your diesel/stripped light ends. this is to compare the results with siulation. note that the initial boiling point of the diesel is the same as the diesel rundown temperature form the column, if the analysis is represintative that is.

cheers,




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