11 replies to this topic

[PSDC_YU]

dear members i am working on NGL extraction plant
i am having problem in recycle loop convergence
i have tried all but i cannot make it if some one can suggest some thing then it would be of great help for me

required file is attached in the link below
NGL Extraction

thanks in anticipation
with regards
shariq

Attached Files

•  NGL extraction.png   18.08KB   38 downloads

[Zauberberg]

The stream 9 should be a "Recycle" stream since it is returned (recycled) to the tower as one of the product streams. On the other hand, having the stream 10 as recycle stream is not required but it shouldn't hurt you.

These are just quick observations based on the sketch you uploaded. I can't run the HYSYS file at the moment. Maybe there are some other issues - e.g. tower specs - which cause the model not to converge.

[PSDC_YU]

The stream 9 should be a "Recycle" stream since it is returned (recycled) to the tower as one of the product streams. On the other hand, having the stream 10 as recycle stream is not required but it shouldn't hurt you.

These are just quick observations based on the sketch you uploaded. I can't run the HYSYS file at the moment. Maybe there are some other issues - e.g. tower specs - which cause the model not to converge.

Thank you Zauber for this valuable comments i also think that the position of recycle is not optimum and i have tried to put it at stream 9 place but this makes the specification totally changed from the required one the the reflux becomes very high if i put more stress on specs anyway i will try to check again it throughly may be i am missing some thing
thanks for your suggestion

[Zauberberg]

I have here HYSYS 2006.5 build 6924 and cannot open the file. You can save it as XML and upload it again.

[PSDC_YU]

I have here HYSYS 2006.5 build 6924 and cannot open the file. You can save it as XML and upload it again.

Here is the XML file hope to hear from you soon
the required specification form the given column is 53% ethane & 28% methane from the top
and bottom specification include 33% propane and higher.
I am also making the dynamic version of this file so if you can suggest me some material from where i can study about the dynamics it would be of great help for me.
Best Regards
shariq

Attached Files

•  NGL EXTRACTION XML File.XML   1.35MB   38 downloads

[shan]

dear members i am working on NGL extraction plant
i am having problem in recycle loop convergence
i have tried all but i cannot make it if some one can suggest some thing then it would be of great help for me

required file is attached in the link below
NGL Extraction

thanks in anticipation
with regards
shariq

[shan]

dear members i am working on NGL extraction plant
i am having problem in recycle loop convergence
i have tried all but i cannot make it if some one can suggest some thing then it would be of great help for me

required file is attached in the link below
NGL Extraction

thanks in anticipation
with regards
shariq

Hi Shariq,

I have converged the tower but I am unable to upload the Hysys file. I got error message "You aren't permitted to upload this kind of file" when I try to use the "Attach This File" option. Please tell me how to establish link as you did.

Actually, the only problem is your overhead condenser. If you define a cooling stream and specify pressure drop through E-100, you will get the tower converged right away.

Regards

Shan

[PSDC_YU]

dear members i am working on NGL extraction plant
i am having problem in recycle loop convergence
i have tried all but i cannot make it if some one can suggest some thing then it would be of great help for me

required file is attached in the link below
NGL Extraction

thanks in anticipation
with regards
shariq

Hi Shariq,

I have converged the tower but I am unable to upload the Hysys file. I got error message "You aren't permitted to upload this kind of file" when I try to use the "Attach This File" option. Please tell me how to establish link as you did.

Actually, the only problem is your overhead condenser. If you define a cooling stream and specify pressure drop through E-100, you will get the tower converged right away.

Regards

Shan

Thank you Shan
i got your point and i have tried it to the column and it is working fine the loop is converged.
thanks again and you can send it by attaching it to the google documents and send the link here.

thanks again

best regards
shariq

[Zauberberg]

I am also making the dynamic version of this file so if you can suggest me some material from where i can study about the dynamics it would be of great help for me.

For Dynamic simulation refer to Hysys tutorials. There is also a couple of examples available in Hysys' sample library.
I've Googled around and there is one interesting link at the Alberta University website: http://www.ualberta....micModeling.pdf

Also look at: ftp://ftp.colorado.edu/cuboulder/courses/chen4570/Boiler/HYSYSDynamicsControlTutorialSpring2005.pdf

[PSDC_YU]

I am also making the dynamic version of this file so if you can suggest me some material from where i can study about the dynamics it would be of great help for me.

For Dynamic simulation refer to Hysys tutorials. There is also a couple of examples available in Hysys' sample library.
I've Googled around and there is one interesting link at the Alberta University website: http://www.ualberta....micModeling.pdf

Also look at: ftp://ftp.colorado.edu/cuboulder/courses/chen4570/Boiler/HYSYSDynamicsControlTutorialSpring2005.pdf

Thank you Zauberberg for having look at my problem and giving your value able time.
May god bless you!!

[Zauberberg]

PSDC

At this time, I feel quite far away from being blessed but thanks for your wishes anyway.

Best regards,
Z

[sheiko]

PSDC

At this time, I feel quite far away from being blessed but thanks for your wishes anyway.

Best regards,
Z

I give you your 20th "+" because you deserve it for all the good files and links you share each time.

Edited by sheiko, 28 March 2010 - 03:04 PM.