HYSYS natural gas high-carbon content decarburization process
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HYSYS is used to simulate the MDEA+PZ natural gas decarbonization process; due to absorption in a single tower and regeneration in two towers, the model forms a cycle that prevents convergence. The situation shown in the picture occurs frequently; what could be the reason? How should I adjust it?
According to the hints, the error is likely due to an excessive specified value for stream 24. There is a significant difference between the molar fraction of water in P-100 (set value: 0.487) and that in VLV-101 (calculated value: 0.938).
So how should this be corrected? I opened the 24-stock logistics section in order to delete the molar fraction of water that was defined earlier, but it was empty once I opened it. It can’t be changed, which is really frustrating :(
I guess there’s no water replenishment in the model you built? It is recommended that you refer to the examples provided by the software.