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Compressor Surge And Anti-Surge Control




Compressor Surge And Anti-Surge Control Compressor surge has been discussed often on the forum with many posts dedicated to the subject. Despite all these discussions there was a serious lack of the basic scheme of anti-surge control. Today's blog entry tries to remedy the situation. I am presenting an excel attachment related to basic anti-surge control which should help all those who have been trying to understand what anti-surge control is all about. Mind you, this is a compilation and not any research. The reference has been clearly mentioned in the excel sheet

Before all of you make a beeline to download the excel attachment, I would like you to read a simplistic definiton of what compressor surge is all about, which I liked very much and am reproducing from "ChemicalProcessing.com" and originally provided by Dr. Meherwan P. Boyce an authority on compressors.
The link for what I am reproducing is:

http://www.chemicalp...s/2007/125.html

A very basic description of the surging phenomenon is that the gas streamlines normally at the diffuser entrance and sometimes at the impeller eye to exhibit a high incidence angle and stall, not unlike an airplane going into a sudden climb. When the stall is reached, the gas in the compressor ceases to flow forward in the compressor and a reverse flow takes place. The reverse flow collides with the forward flow, making the noise one hears when a centrifugal compressor goes into surge. This phenomenon is accompanied by a sudden rise in discharge temperature. Surge prevention can be accomplished by bypassing discharged cool gas back to the inlet using an amply sized valve. The quantity of gas must be equal to the surge flow (taken from the compressor pressure volume curve plus a small margin, such as 10%).


Hope all of you enjoy reading this blog entry and the attached excel worksheet. I look forward for your valuable comments on today's blog entry.

Download the MS Excel file that accompanies this blog entry in the download section:
Compressor Surge and Anti-Surge Control - MS Excel Spreadsheet



Regards,
Ankur.




Dear Ankurji,
Thanks for the article on Surging Characteristics of Centrifugal Compressors. However thought I am able to download the Spreadsheet, I am not able to open the spreadsheet. I do not know the reasons.
Regards,
samrat
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Chris Haslego
Feb 23 2012 03:48 PM

Dear Ankurji,Thanks for the article on Surging Characteristics of Centrifugal Compressors. However thought I am able to download the Spreadsheet, I am not able to open the spreadsheet. I do not know the reasons.Regards,samrat


Try logging out and logging back in. Sometimes, if you log in before validating your account, you can have issues.
A virus named XF/Noisy is reported to be present in this spreadsheet by my free AVG. Could you upload a clean copy ? Thanks ...
I have "Kaspersky" on my computer and it doesn't indicate any virus on the uploaded copy. Free anti-virus software has its own drawbacks.

Regards,
Ankur
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Chris Haslego
Mar 06 2012 03:22 PM
I've checked this file with ZoneAlarm and it reports as clean as well.
A good basic info on surging in compressors. However, for practical aspects of the hardware, include information on how fast the whole control system should respond (in milli seconds or seconds?) and the noise attenuation measures in the recycle control valve, available types of valves in the market etc. :-)
Dear i have downloaded the file but it i think requires passward to open it.

Dear i have downloaded the file but it i think requires passward to open it.


No, it does not require a password to open it. Password protection is only for preventing editing of the file. You cannot edit the file.
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miraclework
Nov 27 2012 06:21 AM
Hi Ankur,

refer to http://www.chemicalp...essors/show/227

Dr. Meherwan P Boyce states that surge phenomenon is accompanied by a sudden rise in discharge temperature.

I welcome the technical explanation for discharge temperature rise.

I belive it temperature should drop.
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Aries Satriyo
Jul 23 2013 11:58 PM

Dear Ankur.,

 

I have already downloaded this Excel file but, I don't have opened it. I must be typed it a New Name. There a small wizard appeared when I opened it.. An Old Name was Print_Area. Would you like to give me a New Name ?

Thank you in advanced.

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