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Corrosion Inhibitors Options In Teg Dehydration Plants


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#1 Papps

Papps

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Posted 03 June 2016 - 10:45 PM

What are the common corrosion inhibitors used in TEG Dehydration plants ??

We use MEA if pH value dr below 6.5 to raise pH, during this activity we observed that if we directly dose it to surge drum we see a temperature raise in surge drum of about 6-8 c and colour change - turns into brown and if not filtered properly it turns into slightly black.

If we shock dose the same slowly to lean glycol pump suction there is no temperature rise observed. Although color change is observed.

I understand that by addition of MEA iron is precipitating out and ineffective filtration leads to colour change but I don't get the temperature raise problem issue. Is that because MEA is highly reactive and which is the primary reason for the temp raise ??????

Would like to know what are the corrosion inhibitors options used in other plants, what are the problems they face post addition of corrosion inhibitors to the system and what is the procedure of addition ?? and some more insight to the problem which I stated above will be helpful for my understanding.

#2 ADITYA.DUBEY

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Posted 04 June 2016 - 02:47 PM

We use DEA and we are getting perfectly fine result with this.I mean no color change and sedimentation or temperature rise like anything.It is usually dose in the lean solution outlet coming from reboiler to surge drum.

Also did you check if your gas has H2S in it??

 

Regards

Aditya



#3 ankur2061

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Posted 05 June 2016 - 06:06 AM

I understand that by addition of MEA iron is precipitating out and ineffective filtration leads to colour change but I don't get the temperature raise problem issue. Is that because MEA is highly reactive and which is the primary reason for the temp raise ??????

Papps,

 

Iron can only precipate out as iron oxide commonly known as rust. Rust can drastically change the color of the TEG and lead to frequent filter clogging. You need to tackle the root cause.

 

Prevent entry of air (oxygen) into the system by providing effective blanketing with fuel gas or nitrogen in the vapor space of vessels and maintaining a slight positive pressure.

 

In addition, dose an oxygen inhibitor such as Hydrazine to prevent formation of iron oxide which is causing the color change and temperature rise.

 

See the link below which is quite informative:

 

http://articles.comp...foaming?start=5

 

Regards,

Ankur.



#4 Papps

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Posted 02 July 2016 - 03:00 AM

H2S presence is clearly affecting TEG. We are looking for a solution which will help us to maintain the glycol quality I.e colour n stable pH. Is there any pH inhibitors available and can be used to sustain glycol quality. Please suggest.




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