Issues regarding Aspen process initialization
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For a distillation process simulation, if convergence is not achieved at first, by changing (reducing) the draw rate from a certain tower and running the simulation directly, the process will converge. Then, change the extraction amount back to a value that did not lead to convergence at the beginning, run it directly, and it converges again. Is this result usable? ? ? However, if it is initialized (kept at a value that does not converge from the start) and then run again, the process will not converge. What’s going on here? ? ? When is initialization generally used, and what is the purpose of initialization? ? ?
If it is not initialized, the initial value for the calculation will be the result of the previous calculation. You can try doubling the number of iterations; that should help it converge.
Reply to 2# emirateyi: Then why are there hardly any initialization issues in Hysys? When a new value is entered, the calculations are carried out automatically. How can the results simulated using it keep converging? Aspen is different; it often needs to be initialized. What are the differences between them in terms of algorithms?