I have a simple simulation of Haber process and just after attachment of recycle stream the simulation would be diverged.
What's the major note to insert a recycle at a simulation?
The file is attached (Aspen Hysys V8.4)
In some cases you should have a good initial guess for your recycle. first run the simulation with out recycle and then add it. it can help you for your initial guess.
Create an accurate initial guess using an external stream. Increasing the number of iterations and decreasing the tolerance of error can be useful. Repeat the procedure to obtain a unique answer.
I do not know if you already tried it, but something that usually helps me to solve divergence problems is to add a purge (tee) before the logic unit and first, let all the flow exit to the purge. Then, step by step increase the recycling flow. Also, it is also physically convenient to add a purge. Good luck!
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