Help questions: ASPEN simulation of ammonia absorption tower
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Now we need to use aspen plus to design a packed absorption tower. The absorbent is 20℃ clean water, and the absorbed medium is pure ammonia gas, 6500kg/h, 57.5℃. When the RADFRAC model was used for simulation, it was found that the absorption effect only depended on the amount of water and had nothing to do with the number of theoretical plates. That is to say, as long as the amount of water is sufficient, all absorption processes occur on the first tray at the top of the tower, and the absorption effect depends on the ammonia-water gas-liquid balance. This situation is unrealistic. How to solve this problem? Please enlighten me, I would be grateful.
I'm afraid it's not possible to absorb ammonia with water. The diluted ammonia still has a strong smell. You should consider adding some carbonic acid. Absorption may be better.
This is chemical absorption. Pay attention to the component definition, there are ionic components, and select the electrolyte or ammonia-specific model for the thermodynamic model. The unabsorbed ammonia content should be defined according to environmental protection requirements.
Try a simulation of non-equilibrium absorption.
Calculate using rate -base