Shortcut Method for Initialization of Dividing‐Wall Columns and Estimating Pareto‐Optimal NQ‐Curves. Issue 10 (2nd September 2021)

• Record Type: Journal Article
• Authors: Ränger, Lena-Marie; Grützner, Thomas
• Is Part Of: Chemical engineering & technology. Volume 44:Issue 10(2021)
• Page Start: 1919
• Page End: 1928
• Publication Date: 2021-09-02
• Subjects: Dividing‐wall columns -- Pareto‐optimal column design -- Shortcut methods -- Vapor‐liquid split -- V·min diagram; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.202100256
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: In early project stages, often no simulation results are available for dividing‐wall columns. Hence, shortcut methods are used to estimate suitable vapor and liquid splits. In a previous paper, it was demonstrated that V · min diagrams are a suited tool to satisfy this need. However, it has turned out that it shows weaknesses for columns with finite or non‐optimal stages. This contribution closes that gap and presents an extended approach to derive suited initial guesses. For this purpose, the original V · min diagram is combined with a heuristic approach to calculate Pareto‐optimal column designs resulting in a stage‐adapted V · min diagram. A comparative study illustrates that the new approach is a powerful tool to generate reliable guesses for multiple dividing‐wall column simulations with finite stage numbers. Abstract : Dividing‐wall columns require reliable initial guesses for vapor and liquid splits for simulation and operation. An extended approach is presented to fulfill this need even if the column is non‐optimally designed and has finite stage numbers. A stage‐adapted V · min diagram is introduced that can be calculated based on shortcut methods. This can also be applied to any other kind of distillation columns.