Gas drying - glycol consumption 1

[MortenA]

Could anybody tell what glycol consumption (volume pr. day) could be in a 150 MMSCFD wet natural gas drying glycol contact unit would be?

Best Regards

Morten

 

[anglo]

For a 300 MMPCD we use a 60 GPM of TEG at the contactor column and spend 12000 lb per month

 

[Bala0610]

Hi

You can "estimate" the losses as follows :

Losses are due to 2 accounts - A : Carryover & B : Evaporation (or vapour pressure related)

A. With a proper demister in place you can have a typical liquid carryover loss of 0.1 USG/mmscf from a column - Use this to estimate carryover losses

B. This would depend on the temperature / pressure of operation and you can estimate this by saturating the gas with TEG and estimating the same at the Contactor. At the Flash drum and Reboiler, the over heads should contain dissolved hydrocarbons, stripping gas (at reboiler, where used), and the moisture that has been picked up at contactor and is released.

For a plant of 150 mmscfd, Contactor operating at approx. 3 kgs/h when operating at 44 deg C and 65 bara.

Hope this helps.

Rgds

 

[ggordonstewart]

As stated, the losses occur at 3 points. The main point of loss is the Reboiler Still Column Overheads. At Atmosheric pressure and an Overhead Temperature of 240 F, the theoretical TEG losses will be 1% of the water removed from the Gas Stream (by weight). This can be reduced by sizing the Reflux Condenser to achieve a lower Overhead Tempeature. There is a limit on how low you can go without flooding the Still Column. The practical limit is 225 to 230 F (assuming that you have a cool enough Rich TEG stream). G. Gordon Stewart, P.Eng.
Gas & Oil Process Engineering Consultant

http://www.ggordonstewart.com/

ggstewar@telusplanet.net