9 replies to this topic

[alirah]

Hi everyone,

I am studying about flare gas recovery process using liquid-jet ejectors. To understand the control philosophy of the  unit I need to study a sample P&ID. Is there anyplace where I can find one? Please help.

[Zauberberg]

If it's not on Google, then there isn't anywhere.

[Zauberberg]

See attached files and the links below - they show basic configuration of VRU's and the equipment involved:

 

http://repository.ta....pdf?sequence=1

http://www.gpa-gcc-c...White Paper.pdf

 

 

Attached Files

•  fgr_min_flaring_hp.pdf   1.24MB   218 downloads
•  Study on flare gas recovery (FGR) to minimize wastes and economical benefits.pdf   175.4KB   160 downloads
•  HE-January-2015.pdf   1.59MB   190 downloads

[alirah]

Zauberberg,

No it's not on google.:(I have some information about process equipment . But I know like nothing about instrumentation and control.

[gegio1960]

www.hijet.com.... try to speak with them

good luck

 

[alirah]

gegio,

I'm working on it as a parallel solution. (which now seems to me like the only solution)

[alirah]

I found this picture while googling and it seems pretty helpful. It seems very similar to what a 3-phase separator in my case should be. I just don't understand why there are 2 level controls! I tried to open the website for more information but it gives some "time zone" error which I can't solve.

http://www.google.co...ed=0CB0QMygAMAA

Edited by alirah, 29 April 2015 - 05:07 AM.

[Zauberberg]

There are two liquid phases (water and condensate) and hence two LC's.

[alirah]

Zauberberg,

You are right. actually the question is: do we need a 3-phase separator when water and Amine solutions need not to separate and the pump sucks the DEA solution as the motive liquid? what am I missing here?  I have prepared a sample p&Id. It would be great if you (as well as everybody else) could have a look at it and correct me. I'm a mechanical engineer and quite new at process engineering. 

Attached Files

•  PID-FGR.pdf   53.58KB   123 downloads

[Zauberberg]

It all depends what the flare gas consists of, and what facilities are available downstream of the flare gas drum for water (or amine) - hydrocarbon separation. You need to think about that before you can make a definite decision on which type of separator to use in this service. Consider all credible scenarios. I see you intend to recycle amine back to amine regenerator. If this stream gets contaminated with liquid hydrocarbons, you can expect foaming and fouling in the regenerator. I think you will also need a pump to transfer the liquid phase back to amine unit.

 

As for the P&ID, it seems like you intend to use eductors for moving gas from the flare header. This setup is quite new for me (which doesn't mean it is not functional - I simply have no experience with this arrangement). Why don't you use a compressor, which is typical and proven in flare gas recovery units?

Edited by Zauberberg, 03 May 2015 - 05:58 AM.