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Natural Gas Sweetening Hysys Simulation

hysys sweetening process simulation natural gas

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#1 sherkhan_95

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Posted 16 October 2015 - 12:02 AM

Hello all..

i want to observe the effect of changing circulation rate of MDEA amine on gas sweetening in amine absorber, but when i change the circulation rate (GPM) , the amine conc. changes automatically in hysys simulation.... (when i increase the GPM the conc (weight%) drops and vice versa)

Can anyone please tell me where the problem is????

The snapshot of my simulation case is attached herewith....

Attached Files



#2 shan

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Posted 16 October 2015 - 06:31 AM

I guess one of your absorber tower spec is top stream CO2 content.  To meet the spec, you need more circulation rate with lower concentration amine and vice versa because the demand of pure amine is constant to the defined natural gas stream. 



#3 sherkhan_95

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Posted 16 October 2015 - 10:29 AM

I checked that, but there is no single absorber spec.... and absorber is converged....

?????



#4 Neelakantan

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Posted 16 October 2015 - 11:30 AM

two questions:

 

1) who did the initial simulation?

2) is there any adj or set in the simulation? if so what are they?

3) better to mail or include the simulation file so I can have a look and revert

 

regards

neelakantan



#5 sherkhan_95

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Posted 16 October 2015 - 10:59 PM

Hello neelakantan...

I personally did the simulation..

There is only one set operation in order to adjust the lean amine pressure above gas inlet to absorber pressure....

and i did not use ajdust operation....

 

Regards....



#6 medelamine

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Posted 19 October 2015 - 01:38 AM

Please, can u answer these ? 

 

what spec did u add to converge the regenerator ?

Is the H2O makeup flow constant ? 

 

I guess the problem is due to the Recycle operation, in order to converge it will need equal streams on both of its sides (estimated and calculated). And since u should obviously have amine losses somewhere in the plant (and no amine make up), the amine concentration on the both sides of the recycle operation won't much for amine concentration. It will consequently solve that problem by decreasing the initial amine concentration so that it will be equal to the calculated one. 

 

What I would recommend you to do, is to set the recycle information transfer into "backward" (recycle/parameter/ transfer for flow and concentration to backward) and add an amine make up stream to the mixer. It should then converge without any problem. 

 

This is a mere opinion, I hope expereinced users bring more insight on the issue ! 



#7 sherkhan_95

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Posted 21 October 2015 - 05:49 AM

Hello medelamine and neelakanton,

Please send me ur email id... i want to send u the simuation file, in order to find out the problem,,,

Thanks alot.....



#8 shantanuk100

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Posted 12 November 2015 - 04:56 AM

Hello Sher Khan,

 

Your Lean Amine Inlet concentration to absorber is dependent on the output of the absorber as well since you are using a recycle operation which is a recursive process.

By changing the GPM you change the amount of absorption and regeneration as well, and also the losses in the absorber and regenerator. There is a continuous loss of amine for you but no makeup and the same inlet stream is being regenerated. By increasing flowrates, you increase the amount of losses as well such as entrainment losses etc., so you can expect that the concentration will be lowered.

Add a make-up amine stream to avoid this and optimize it.

 

 

Shantanu


Edited by shantanuk100, 12 November 2015 - 11:31 PM.





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