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Main Title: A pressure-driven, dynamic model for distillation columns with smooth reformulations for flexible operation
Author(s): Hoffmann, Christian
Weigert, Joris
Esche, Erik
Repke, Jens-Uwe
Type: Article
Language Code: en
Abstract: Dynamic models for plants including the startup or shutdown phase are still scarce as the (dis-)appearence of phases or streams is challenging to implement. We present an approach to model a distillation column, in which these operation modes are also considered without exchanging equations. For this purpose, the well-known modeling equations for distillation columns are reformulated robustly to allow for the disappearance of the vapor phase without discontinuities. The reformulation does not depend on solving an optimization problem and could easily be applied to other column types or different unit operations. The proposed model is solved in two case studies with 10 and 40 trays, respectively. In these case studies, the influence of single phenomena on the obtained dynamic profiles is investigated, e.g., weeping, which are often neglected. The proposed modeling approach yields a dynamic model that can be solved without reinitialization for a realistically large number of trays.
Issue Date: 17-Aug-2020
Date Available: 19-Aug-2020
DDC Class: 660 Chemische Verfahrenstechnik
Subject(s): pressure-driven modeling
dynamic modeling
distillation column
startup operation
Sponsor/Funder: BMBF, 0350013A, Verbundvorhaben: ChemEFlex - Umsetzbarkeitsanalyse zur Lastflexibilisierung elektrochemischer Verfahren in der Industrie; Teilvorhaben: Modellierung der Chlor-Alkali-Elektrolyse sowie anderer Prozesse und deren Bewertung hinsichtlich Wirtschaftlichkeit und möglicher Hemmnisse
Journal Title: Computers & Chemical Engineering
Publisher: Elsevier
Publisher Place: Amsterdam [u.a.]
Article Number: 107062
Publisher DOI: 10.1016/j.compchemeng.2020.107062
EISSN: 1873-4375
ISSN: 0098-1354
Appears in Collections:FG Dynamik und Betrieb technischer Anlagen » Publications

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