[Armani_AD]

Dear Gents,

Am working in a gas plant, and one of our process units is Gas dehydration unit, my concern is the water content in the lean glycol is HIGH, the normal value is 0.15 %wet and the value which am getting is 0.25 % wet which is above the normal value !

in our glycol regeneration package we are using stripping gas which is natural gas to strip out the water content and the flow of the stripping gas is 300 kg/hr, and i know if i increase the stripping gas it will reduce the water content, but what i need to know in general why the water content increase in the lean glycol ? and how can i solve it ?

Thanks

[eugenedakin]

Hello Armani_AD,

Good question! There are a few reasons as to the reason for the slightly increased water content on the Lean Glycol side of the Gas Dehydration Unit. But first, if there is no problem with the final water concentration (dewpoint) of the Lean Natural Gas, then I would not be too concerned with this slight shift in water content.

If this increased water content is slightly higher, here are some suggestions that you can examine to identify the source of the higher water concentration:

1) Does the stripping gas contain any moisture?
2) Has there been a decrease in reboiler temperature
3) More wet-gas is being processed - slightly overworking the reboiler
4) A lower contact-time in the reboiler
5) An increased rate of glycol through the reboiler
6) Unequal heating in the reboiler
7) ... and possibly more ...

These are just a few suggestions. Could you get back to me with answers to some of these questions, and I will help you out some more.

Best wishes,

Eugene