Donny,

It depends a lot on your application. Are you dehydrating with MEG in a contactor tower or are you using MEG as a hydrate inhibitor in a low temperature separator?

MEG losses will be in three forms : 1) Losses due to MEG vapour pressure in the dehydrated gas, 2) losses due to physical carry-over into the gas stream and 3) losses in the MEG regeneration system. If you are using a low temp separator system with MEG hydrate inhibition there will also be losses of MEG into the condensate and water phases exiting the LTS.

Vapour pressure losses can be estimated from Process Simulators making sure the thermo package is suitable for glycol equilibria properties - these losses depend on process conditions. Other losses like carry over can be estimated from published efficiency figures for the type of trays / separator in use.

I would suggest starting with a simulation and establish all the vapour pressure and solubility losses and then add the carry-over estimates to give you teh total estimated losses.

Regards
Phil.

Hi!
We are using MEG injection on our EPF. Our real losses for 2007 is 0.42 gl/MMscf. Real losses are depended from many factors which very difficult to define during designing. They are depened from gas rate, how old is your glycol, how often you change your filters and how good they are and many others.
Regards.
Sergiy

Phil/Sergiy,
Thanks for the reply.

Phil, the MEG in our plant is for hydrate inhibition, no contactor tower used. The MEG is injected into gas phase in the shell and tube gas/gas exchanger and also second injection into gas phase in the chiller, both are upstream of Low Temperature Separator.


regards,
Donny

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