3 replies to this topic

[prince47]

DEAR MY FRIEND

I HAVE PROBLEM AMD I NEED FOR HELP FROM. MY PLANT IS PROCESSING THE SOUR GAS AND REMOVE THE ACID GAS FROM IT BY SWEETENING PROCESS . I TRAY TO CALCULATE THE THE ENERGY LOSSES WHEN THE AMINE SOLVENT% REDUCE I NEED FROM YOU THE WAY TO CALCULATE THIS ENERGY LOSSES.

(I have a problem and I need your help. My plant is processing sour gas to remove the acid gas portion by using a sweetening process. I have tried to calculate the energy losses when there is a reduction in the amine solvent concentration. I need your help in calculating the energy losses.)

THANK YOU VERY MUCH

[Art Montemayor]

Prince:

There are various flaws in your English writing and I've taken the liberty to edit the contents in order to make sure we all understand what it is that you are saying. Please read my edited portion and confirm that I have translated your writing correctly.

P.S. I don't know what you mean by "energy losses", so I couldn't elaborate on that. I think you need to be specific as to what you are referring to. Also state what amine solvent you are dealing with and what its concentration means to the energy loss you refer to.

[Zauberberg]

One item which you can consider is the requirement for increased solvent circulation rate, due to lower amine concentration - for the same acid gas pickup rate. This will give you extra pumping energy consumption (assuming VFD motor), and more important, higher amount of energy which needs to be supplied to the solvent through the regenerator reboiler.

However, make sure that you can load your rich amine up to the value which is set by the new (lower) amine concentration. It might happen that you will simply reach the thermodynamic equilibrium which does not allow you to load the solvent beyond this particular loading limit, and slippage of acid gas will occur (maximum amine loading determines the circulation rate, at any amine concentration). Also, reducing amine concentration and increasing circulation rate will reduce the residence time in absorber, so you may encounter kinetic limitations of acid gas absorption as well. Make sure that you know what you are doing, before you actually do it out there in the field. Remember that increasing solvent circulation rate puts additional hydraulic load on absorber and regenerator towers.

What you can do, is to close the heat and material balance for both cases, and calculate the extra amount of energy required to heat the incremental rate of solvent from tower inlet temperature to tower bottoms temperature. Other two energy items (acid gas desorption and reflux evaporation) will remain the same, since acid gas flow is unchanged in both cases.

This is your "energy loss"; the more appropriate term would be "higher energy consumption" but it is all the same, at the end of the day.

[prince47]

Prince:

There are various flaws in your English writing and I've taken the liberty to edit the contents in order to make sure we all understand what it is that you are saying. Please read my edited portion and confirm that I have translated your writing correctly.

P.S. I don't know what you mean by "energy losses", so I couldn't elaborate on that. I think you need to be specific as to what you are referring to. Also state what amine solvent you are dealing with and what its concentration means to the energy loss you refer to.

Thank you dear frind for correct my statment