5 replies to this topic

[ganeshrbhat]

Dear Members,

I am trying to make a flue gas acid gas dew point simulation in Aspen. I used ElecNRTL thermodynamic package for the simulation. With 16% water vapour and 100ppm SOx, the dew point should be around 127 degC. My simulation shows dew point of 57 degC. Guess its not taking acid gas formation into account. 

Does anyone here know how to simulate acid gas dew point for flue gases? My objective is to find out how much water will get knocked out from the flue gases when I cool it down to 80 degC. 

Your help/advice is much appreciated 

Thanks and regards,

 

[SilverShaded]

I think you just need to work out how much water vapour is left in the flue gas at 80C and do a mole balance, on the assumption that all the SO2 is dissolved in the water.

[breizh]

Hi,

Go for a try: https://heatmatrixgr...int-calculator/

 

or

https://heatmatrixgr...dp-of-flue-gas/

 

EDIT : Should be around 138C and 141 C, according to methods above

 

Note: Using EOS Peng Robinson and online simulator (Canary) I got a dew point of 57 C @ 100 Kpa, similar to your result.

https://www.questcon...perties-fluids/

 

Breizh

[ganeshrbhat]

Thanks for the suggestions  

[ganeshrbhat]

Hi,

I use this online calculator for finding the Acid Gas Dew Point.

 

https://www.heataiddesign.com/engcalc

 

In any case, any idea on how to simulate acid gas dew point in softwares like Aspen? 

Thanks

 

Hi,

Go for a try: https://heatmatrixgr...int-calculator/

 

or

https://heatmatrixgr...dp-of-flue-gas/

 

EDIT : Should be around 138C and 141 C, according to methods above

 

Note: Using EOS Peng Robinson and online simulator (Canary) I got a dew point of 57 C @ 100 Kpa, similar to your result.

https://www.questcon...perties-fluids/

 

Breizh

[SilverShaded]

The problem is as you are probably aware in estimating the H2SO4 content and i can see why you chose ElectNRTL.  I'm not familiar with that particular thermo method but in all probability it probably needs to be tuned to real data, as do all NRTL packages to get anything like a realistic answer.

Edited by SilverShaded, 03 April 2023 - 04:06 AM.