9 replies to this topic

[Anshul619]

Dear all,

 

I am really confused while calculating the circulation rate of TEG in stripper column.

 

I have downloaded an article from internet but I am not able to get absorption efficiency from it.

 

I am also attaching a document for details of Stripper Column Material Streams.

 

Please help me by explaining the step by step sizing.

 

 

Attached Files

•  Stripper Details.pdf   248.84KB   115 downloads
•  Calculating TEG Rate.pdf   44.7KB   149 downloads

[Zauberberg]

The rate of TEG feeding the stripper is equal to the TEG circulation rate. Otherwise there will be an accumulation of mass inside the system, right?

 

The amount of TEG you circulate to the absorber is the amount of TEG feeding the still column, equals the amount of TEG flowing from reboiler to the stripper.

[Anshul619]

Zauberberg,

 

First of all thank you for replying to my query.

 

Secondly, Now I am confused.

 

In GDU, What is TEG Circulation Rate????

 

As I have attached a document "Stripper Details",please see this document and tell me the definition of TEG Circulation rate.........

 

Thank you

[Zauberberg]

TEG Circulation rate is kg/h or m³/h of lean glycol flowing to the top of the absorber. Your stripper is only a part of GDU.

 

However, I see that you have the flowrate specified for stream 26.

[Anshul619]

So the lean TEG which is going towards the Still is my circulation rate as per stream #31

 

I have now attached  file "Overalll" Plz see that and specify if my above statement is true.

Attached Files

•  Overalll.pdf   29.99KB   105 downloads

[Zauberberg]

Your flowsheet is very confusing - why it is done in such a way?

 

Flowrate of stream 25 minus flowrate of stream 27 equals flowrate of stream 26 feeding the stripper (all flows in absolute units, kg/h).

There should be no SET operation used between streams 26 and 27, between 26 and 31, and between 31 and 32.

 

Once when you feed the stripper with glycol flow as calculated above, the bottom outlet from the stripper will be the stream 32, flowing to rich/lean TEG exchanger.

[Art Montemayor]

 

 

Anshul:

 

The way you are submitting your query and data in this thread has all the earmarks of making the thread a long, dreary, and unprofitable one for you and the Forum members.

 

This is the Industrial Professionals Forum, so why don’t you submit a professional quality of PFD?  Copying and pasting sections of a simulation program PFD is not a professional way of communicating.  The simulation program does not produce a logical or friendly PFD because that is not its objective.  If you want to communicate with your peers it is far more effective to generate your own PFD – with your own time and effort put into it.  Look at the attached TEG Dehydration PFD and give me your comments on how it compares with your contribution.

 

Where did you obtain the “Equations for calculating the circulation rate, number of actual trays”?  Please give us a complete reference to that information.  Without a credible reference, no one can place any credence on what it states.   If you can't understand how the TEG circulation rate is calculated, show us how you have started your calculations (on a spreadsheet) and then we can see how you have gotten off the beaten path.

 TEG Dehydration Unit.xls   153.5KB   189 downloads

 

[Art Montemayor]

_Anshul:

 

_{Further to my comments and recommendations above, I am attaching a document that addresses your concern for calculating the TEG circulation - but with a twist: it is a method recommended for estimating the "optimum" TEG circulation  rate - by the US government.}

 

_{Zauberberg:  I would greatly appreciate your valued opinion and comments on this document in the event you have not seen it before.}

 

   Optimize TEG Circulation and Flash Tank.pdf   200.56KB   153 downloads

[Anshul619]

 

Art,

 

Thank you for replying on my query and I would try in future to minimize my Presentation errors as far as possible.

 

1. I downloaded the article“Equations for calculating the circulation rate, number of actual trays” from following website.

 

http://images.pennwellnet.com/ogj/pdf/972537.pdf   which is on website pennwellnet.com

 

 2. I compared your Excel based PFD to my PFD and all things are similar except following:

              a.)  There are 2 contactors from which Rich TEG is mixed into 1 stream by Mixer after leaving both contactors.

              b.)   Subsequently, after Glycol surge drum again Lean TEG is separated by Tee .

         

 3.  I am understanding the concept of your above article but first I need to calculate Circulation rate and then optimize it.

[Anshul619]

Zauberberg,

 

What do mean by "NO SET OPERATION"???

 

And I am not not able to understand which ABOVE calculation.???