errosion-corrosion in aMDEA solution

Post Reply
mehdiAmiri
Posts: 4
Joined: Thu Apr 06, 2017 10:52 am

errosion-corrosion in aMDEA solution

Post by mehdiAmiri » Thu Dec 06, 2018 6:19 am

we operating KBR plant with aMDEA solution on the CO2 removal section
we face with some corrosion on the piping and stripper tower especially at bottom of tower
we change the material of piping from carbon steel to s.s but we don't know any reason for corrosion on the stripper could you please give us some advice our share your experience
Thank you

ar70engr@hotmail.com
Posts: 1
Joined: Thu Apr 06, 2017 10:52 am

Re: errosion-corrosion in aMDEA solution

Post by ar70engr@hotmail.com » Tue Jan 08, 2019 6:55 am

Normally aMDEA system is corrosion free but if you introduce gas in the system at below 30% aMDEA concentration it may cause corrosion.

mehdiAmiri
Posts: 4
Joined: Thu Apr 06, 2017 10:52 am

Re: errosion-corrosion in aMDEA solution

Post by mehdiAmiri » Wed Jan 09, 2019 4:01 am

thank you for your reply
this is some picture of corrosion on bottom of stripper
You do not have the required permissions to view the files attached to this post.

gschulz
Posts: 9
Joined: Thu Apr 06, 2017 10:52 am

Re: errosion-corrosion in aMDEA solution

Post by gschulz » Fri Oct 04, 2019 2:44 pm

Dear Mehdi Amiri,

we have suffered erosion corrosion at the piping connecting the amine (aMDEA) stripper reboiler with the reboiler. It is supposed to be only low pressure steam flow. Damage was observed especially at elbows. It is caused due to excessive reboiler duty. Are you operating with increased CO2 loading due to limitation to increase of amine solution flow ?. This will probably oblige you to overstrip and if the stripper cannot regenerate completely the amine, there will be some CO2 partial pressure at reboiler, thus, with increased water vapor flow there will be some carbonic acid carryover fro reboiler to stripper. When this high speed biphase flow, impingies on stripper walls it can promote the erosion corrosion phenomena (caracterized by horse shoe like marks). Best regards, G schulz

PD: please find attached a paper that explains this problem as part of a debottlenecking study.
You do not have the required permissions to view the files attached to this post.

Post Reply