Journal ArticleDOI
Effect of recycle structure on distillation tower time constants
TLDR
In this paper, an improved method of estimating time constants, which can be extended to industrial towers, is presented, which is shown to be the recycle nature of distillation towers and can be used to estimate tower time constants.Abstract:
Recycle of material or energy can change the effective dynamic behavior of a process. Distillation towers are inherently recycle processes. Published tower time constants based on linear analysis have been substantially in error when compared to actual responses for many cases. The reason for this error is shown to be the recycle nature of distillation towers. An improved method of estimating time constants, which can be extended to industrial towers, is presented.read more
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Journal ArticleDOI
Nolinear model predictive control using Hammerstein models
TL;DR: In this article, a model predictive control scheme is proposed using the Hammerstein model structure, which is composed of a linear dynamic element in series with a nonlinear static element, and two simulation examples, a pH neutralization process and a binary distillation column, are used to demonstrate the effectiveness of the method.
Journal ArticleDOI
Understanding the Dynamic Behavior of Distillation Columns
Sigurd Skogestad,Manfred Morari +1 more
TL;DR: Mise en place d'un modele a deux constantes de temps en tenant compte des changements d'ecoulement internes et externes.
Journal ArticleDOI
Dynamics and control of distillation columns : a critical survey
TL;DR: In this article, the authors discuss the importance of flow dynamics for control studies, the fundamental problems in identifying models from open-loops responses, the use of simple regression estimators to estimate composition from temperatures, and an improved general understanding of the dynamic behavior of distillation columns.
Journal ArticleDOI
Nonlinear dynamics and control of process systems with recycle
Aditya Kumar,Prodromos Daoutidis +1 more
TL;DR: In this paper, a model reduction methodology for deriving nonlinear low-order models of the slow dynamics induced by large recycle streams is presented, and a controller design framework consisting of properly coordinated controllers in the fast and slow time scales.
Journal ArticleDOI
LV-Control of a high-purity distillation column
Sigurd Skogestad,Manfred Morari +1 more
TL;DR: In this paper, a realistic study of the LV-control of a high-purity distillation column is presented, where linear controllers designed based on a linearized model of the plant are found to yield acceptable performance also when there is model mismatch.