Diagnostic methods for difficult convergence of distillation columns in Aspen HYSYS

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This post was last edited by Zhenren Hualin Sixian on 2018-2-9 at 09:43. What steps should be considered when it is difficult for a distillation column to converge, or when the desired performance cannot be achieved from the column? Method: If convergence is not achieved during the column iteration of the tower, the diagnostic window will provide useful clues regarding the solver’s computation process. If the balance error is close to zero, but the heat and specified errors remain quite large, it is very likely that the design requirements will not be met. If neither the equilibrium error of the distillation column nor the errors related to heat and other specified parameters converge, then it is necessary to check the input information for the distillation column, such as the initial conditions, design specifications, and configuration details. Before starting the fault diagnosis steps listed below, first RESET the tower and then run it again. The Reset button will clear all estimates from previous solution processes. For specific methods, see the blog at http://blog.sina.com.cn/s/blog_6bf5648e0102wvb0.html