In atmospheric distillation, convergence ceases after increasing the number of theoretical plates – what’s going on?
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In the normal-pressure distillation operation, the theoretical number of theoretical plates was initially set to 38 during the simulation calculations, and the process converged during operation. With all other settings unchanged, convergence is not achieved when the number of trays is changed to 39, and the same is true for 40. What’s going on here? The maximum number of iterations has also been changed to 200; logically, the more theoretical plates there are, the higher the separation accuracy should be.
Try increasing parameters such as the reflux ratio.