No replies to this topic

[CheAmine]

Hello,

 

We have a sour water treatment unit in which all the sour water streams across the plant are collected and stripped off from H2S so that it can be injected to the ground.

 

The vapors released from the sour water tanks are sent to H2S adsorbent to be stripped from H2S and released to atmosphere. Since commissioning we have been suffering from the fast saturation of the H2S adsorbent (activated carbon). We believe this is due to the carry over of HCs with H2S to the H2S adsorbers. 

 

Due to this frequent and fast saturation, we would like to divert the overhead vapors to the acid gas flare. The design pressure of the sour water tanks and acid gas flare are 500 mbarg and 3.5 barg respectively ! Due to this, it seems to be not practical.

 

It would be a great help for me if someone can suggest how can this be implemented (some kind of mechanism) . Moreover, are there any other types of adsorbents which are suitable for HCs carryover.

 

I have read in several articles that injecting heavy hydrocarbon to the sour water tanks will make a layer above of the sour water and will be helpful in restricting the huge amount of HCs and H2S to be released. What kind of heavy hydrocarbons are suggested (is it diesel ?) and how much quantity is required ?

 

Kindly note that the overhead vapors line is steam traced and slopping towards the H2S adsorbers.

 

I am ready to share any other information required.

 

Regards,