Amine absorber
Amine absorber
(OP)
Hi
I work in gas plant. Newly, we faced with serious problem.
We have two amine pumps. amine circulation is 145m3/h. according design when amine flow reached to 120 m3/h(any reason),due to be active a Alarm, this Alarm to start the stand-by pump. Sufficient time to this work is 10sec.if in this time flow reach to 109.5m3/h, another Alarm to be active and after 30 second if reach flow to above 109.5 ,that due to be unit shutdown.
Now,we would like to change second time to above 30.i don’t know how we must investigate the feasibility it?
Meanwhile, in a same plant, Empirically, Time will reached to 90sec.but No reasonable calculations.
I work in gas plant. Newly, we faced with serious problem.
We have two amine pumps. amine circulation is 145m3/h. according design when amine flow reached to 120 m3/h(any reason),due to be active a Alarm, this Alarm to start the stand-by pump. Sufficient time to this work is 10sec.if in this time flow reach to 109.5m3/h, another Alarm to be active and after 30 second if reach flow to above 109.5 ,that due to be unit shutdown.
Now,we would like to change second time to above 30.i don’t know how we must investigate the feasibility it?
Meanwhile, in a same plant, Empirically, Time will reached to 90sec.but No reasonable calculations.





RE: Amine absorber
If downstream is a cryogenic section, passing too much CO2 from the feed gas will cause freezing inside the equipment downstream, with possible damages and definitely a log time shutdown for defrosting. As said above, your team should investigate what happens if the flow of Amine is below design value for certain amount of time, and what are the consequences. Only then you can start evaluating effects of different duration of acid gas breakthrough.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Amine absorber
Thanks you for your answer
Do calculation residence time on any tray, we can find the best time??
We have residence time on tray in design mode???
As you know, residence time is inversely ratio to the fluid flow.
If we can draw performance cure tower, that be good help for we.
RE: Amine absorber
Acid gas analysers on the absorber exit line may help to provide a more realistic logic sequence to trigger the shutdown, but agree that reliance on analysers for trip sequences is not a good idea.
RE: Amine absorber
I'd check your downstream specifications for CO2 and H2S to see how much time you give on those pumps to start.
You can also check on the type of pump used, you might find faster to start pumps.
Gabriel Castaneda, P.E.
http://www.gabcheminc.com
RE: Amine absorber