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Seeking help with consistency issues

2020-06-21View Original

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As shown in the figure, how should this be resolved?
Reply #22020-06-21
As shown in the figure, after the process was established, the data were modified in the upstream logistics section; as a result, the calculation values for certain intermediate boiling streams within the tower kept showing inconsistencies during operation – sometimes it was the molar entropy, and other times it was the enthalpy value. No solution could be found in the advanced calculation options, and increasing the various tolerances also didn’t help. I’ve encountered issues before where the temperatures were inconsistent; deleting and adding them again still caused problems, but making drastic changes and then reverting them solved it. For the problems related to tower calculations, changing the solution method from the modified HIO to HIO can also resolve this consistency error issue, but the convergence rate is too low. Choose the modified H I O to continue with the calculations; when consistency errors occur, keep restarting the solver, and eventually convergence is achieved, but this isn’t a good solution – sometimes it takes half a day or more.

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