4 replies to this topic

[Thomas-pearl]

I'm working on a change of the flow (circulation) of amine absorption in existing column. This is a tray column. I want to check if the column diameter will be sufficient for a new conditions (greater circulation of amine). I draw attention to the parameters of a column such as fraction flooding  (at a known diameter) and rich amine load (MDEA 0.5 mol / mol). Are there any parameters of the column to which I should pay attention to?
I will be very greatful for any suggestions.
Regards,
 

[RockDock]

Hydraulically, the fraction flooding is the main indicator of proper sizing of the amine absorber. If you maintain a flooding under 80%, you are very likely to be within the other more obscure constraints.

 

I would also add these process parameters to your list to monitor:

 

• Lean/Rich Approach H2S
• Lean/Rich Appraoch CO2
• Rich Loading
• Reboiler duty/Rating (make sure the overdesign stays above 5%)
• Reboiler vapor (make sure CO2 is below 5% in this stream
• Lean/Rich Exchanger (maintain a reasonable temperature approach and fraction over design)

 

The above parameters, coupled with the fraction flooding will give you a very good picture of whether you can increase your circulation rate. I would recommend using the ProMax scenario tool to do this, as that would take a matter of minutes, as opposed to going through and doing each case manually.

[fallah]

Hi,

 

Overdesign percent on circulation flowrate in basic design stage, also is to be considered...

[Thomas-pearl]

Hydraulically, the fraction flooding is the main indicator of proper sizing of the amine absorber. If you maintain a flooding under 80%, you are very likely to be within the other more obscure constraints.

 

I would also add these process parameters to your list to monitor:

 

• Lean/Rich Approach H2S
• Lean/Rich Appraoch CO2
• Rich Loading
• Reboiler duty/Rating (make sure the overdesign stays above 5%)
• Reboiler vapor (make sure CO2 is below 5% in this stream
• Lean/Rich Exchanger (maintain a reasonable temperature approach and fraction over design)

 

The above parameters, coupled with the fraction flooding will give you a very good picture of whether you can increase your circulation rate. I would recommend using the ProMax scenario tool to do this, as that would take a matter of minutes, as opposed to going through and doing each case manually.

 

Thank's for your message, and very useful information. I'll pay attention to these parameters too.

[RockDock]

No problem. Good luck!