3 replies to this topic

[TeeEng]

Hi Folks,

 

Can I pick your brain on an absorption emissions scenario?

 

I am running a model using an amine based solvent to capture CO2 from a flue gas in a contactor (absorber), however, about 600 ppm of solvent is been carried over with the treated flue gas exiting the contactor. To recover this, I added a two water wash columns down stream of the contactor overhead and with this I was able to reduce the solvent carry over to ~100 ppm and ~40 ppm at the outlet of the two water washes respectively. This client requirement is to get the solvent carry over down to <1.5 ppm and the one way I know to achieve this is to add an acid wash downstream of the 2nd water wash but with this, I can remove the 40 ppm solvent carryover but this would be unrecoverable which will add up and result to about ~35% solvent makeup per annum. This is huge and not economically competitive so I am looking for other ways to reduce the solvent carryover or loss to about 2 - 5 ppm.

 

Kindly share your experiences on how I might achieve this.

 

Thanks folks,

 

TeeEng.

[Pilesar]

Solvent losses seem inevitable with some amines worse than others. Further cooling the vapor stream and adding high-tech mist eliminators is the approach I might consider. There is an economic optimum, but 35% amine loss per year may just be an operating cost. Are you certain those losses are out of line with industry results?

[TeeEng]

Solvent losses seem inevitable with some amines worse than others. Further cooling the vapor stream and adding high-tech mist eliminators is the approach I might consider. There is an economic optimum, but 35% amine loss per year may just be an operating cost. Are you certain those losses are out of line with industry results?

Thank you for your response.. Yes the solvent loss is humongous. Typical high pressure gas sweetening with MDEA will have ~1ppm solvent carry over with the sweetened gas. Not so sure about this low pressure system 

 

The ~40ppm solvent emission are in vapor phase so not so sure high-tech mist eliminators will be able to recover that - What do you think? Do you have a vendor recommendation I might be able to consult with?

 

Folks, please share your experiences.

 

Regards,

 

TeeEng!

Edited by TeeEng, 24 October 2023 - 01:30 PM.

[breizh]

Hi,

You may want to contact Sulzer about mist eliminator.

Breizh