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Teg Contactor Operation


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#1 Papps

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Posted 04 October 2015 - 12:05 PM

As per reference books, Differential temperature across Lean TEG to contactor and Wet Gas should be maintained at 5-7 C.

 

I want to know more on this thumb rule, my queries are:

 

1.) If delta T is less than 5-7 C How hydrocarbon condensation occurs into lean TEG occurs ?

 

2.) Natural Gas contains primarily of Methane. Which form of heavier is getting condensed i.e Propane , Butane ???

 

3.) If delta T is more than 7 C what will be the effect ? Absorption efficiency will decrease ?

 

 



#2 PingPong

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Posted 06 October 2015 - 01:38 PM

That 5 - 7 degrees is just a typical margin.

 

What it should really be depends on the composition of the natural gas, including its water vapor content. The more water is removed by the TEG the more the HC dewpoint of the natural gas will increase, and therefor the higher the temperature difference between TEG and natural gas feed should be.

 

Condensed liquid will contain some C3 and C4 but will mainly be C5 and heavier. Depends again on actual natural gas composition.



#3 cylai

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Posted 05 November 2015 - 02:51 AM

Hello Papps,

 

http://www.cheresour...r-to-contactor/

 

Wet gas entering the contactor is saturated. A slight drop in temperature will result in condensates. The regeneration system will be overloaded.

 

Dry gas leaving the contactor will carry glycol over (losses). An increase in temperature, increases molecules kinetic energy of the fluid, the glycol molecules will start knocking on each other and start ejecting into gas phase which is less denser (similarly with putting a glass of water in the room).



#4 shantanuk100

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Posted 12 November 2015 - 09:51 AM

Hello Papps,

The 5-7 degree margin is a conventionally followed value.

If you keep it too low, then you tend to get condensates of the heavier hydrocarbons since they have higher bp's. Which hydrocarbon condenses depends on the source of natural gas, but is usually above C6, though not always true and also is dependent on conditions. The heavier ones tend to condense first due to larger molecular weights and intermolecular bonding, as they are the ones that tend to exist in liquid or solid states predominantly.
Gas from different areas have different compositions even if they have methane in common so even the heavier components change from source to source.

When you have high temp differences, then the vapour entrainment losses of glycol in the gas increase due to high overall temperature ( which is nothing but average kinetic energy of the molecules ) and also cause higher reboiler regeneration load duties.

Additionally I would like to suggest GPSA handbook as a valuable source of information on Gas components, compositions, condensate and hydrate formation.

Regards,

Shantanu


Edited by shantanuk100, 18 November 2015 - 12:59 AM.





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