Startup of Distillation Columns Using Profile Position Control Based on a Nonlinear Wave Model

Han, Myungwan; Park, Sunwon

doi:10.1021/ie980444s

Cited by 28 publications

(27 citation statements)

References 23 publications

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“…From then on, wave traveling theory is widely used for low‐order modeling of distillation columns. Balasubramhanya and Doyle32, 33 developed a low‐order wave model for high‐purity distillation columns with online updated profile parameters; Group led by Han34–36 established concentration and temperature observers on the basis of wave velocity; Group led by Henson37, 38 developed a complete low‐order dynamic wave model of cryogenic distillation columns. Profile estimators designed for wave models using temperature and component concentration were also systematically studied 39, 40.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear wave modeling and dynamic analysis of internal thermally coupled distillation columns

et al. 2011

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Internal thermally coupled distillation column (ITCDIC) is a frontier in the energy saving distillation research. It is well known for the complex dynamics, which challenge the establishment of an excellent reduced model for further control strategy design greatly. In this article, a physical approach of the ITCDIC process based on nonlinear wave theory is explored, where it is first discovered that traditional wave theory in conventional distillation columns (CDIC) could not be directly applied in ITCDIC, due to: First, the internal thermal coupling results in mole flow rates varying evidently over each stage, which not only makes the wave modeling of the wave phenomenon in ITCDIC more difficult but also makes wave dynamics greatly different between ITCDIC and CDIC; Second, an interesting wave phenomenon of ITCDIC is discovered that waves located in the rectifying section and stripping section travel under opposite tendencies when the steady state is disturbed by the step change of thermal condition q, one sharpens and the other is likely to spread synchronously, it means the movement of wave profiles in ITCDIC could not be simply described by shock wave velocity, which is usually used in wave modeling of CDIC; more seriously, shapes of the self-sharpening wave profiles in ITCDIC change obviously during the traveling processes, which further reveals that shape influence on wave velocity has to be considered in the wave modeling of ITCDIC. A rigorous wave velocity and a natural wave velocity are derived, respectively, based on which, the detailed analyses of traveling wave characteristics are carried out. A novel wave velocity, based on the profile trial function which has been well developed by Marquardt, is further derived to consider the obvious change of profile shape. And a completed nonlinear wave model of ITCDIC is thereby established by combining the proposed wave velocity with thermal coupling relations and material balance relations. The benzene-toluene system is illustrated as an example, where component concentration prediction and distinct dynamic characteristics are carried out in detail based on the proposed nonlinear wave models. The research results reveal the accuracy and validity of the proposed nonlinear wave model of ITCDIC.

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Section: Introductionmentioning

confidence: 99%

Nonlinear wave modeling and dynamic analysis of internal thermally coupled distillation columns

et al. 2011

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“…The trays are hydraulically sealed and the column is shifted from the total reflux conditions to the required reflux rate. Then, as the column reaches the neighbourhood of the desired steady state (third phase), different start-up control schemes have been proposed in the literature (Yasuoka et al, 1987;Ganguly and Saraf, 1993;Han and Park, 1999;Klein et al, 2000) in order to reduce the start-up time and the waste product.…”

Section: Background On Start-up Operationmentioning

confidence: 99%

An Extensive Analysis on the Start‐up of a Simple Distillation Column with Multiple Steady States

Benz¹,

Scenna²

2002

Can J Chem Eng

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The impact of start‐up procedures on the behaviour of simple distillation columns with multiple steady states is analyzed. A well‐known system with hysteresis is studied in this paper and transient responses for a binary distillation column yielding different steady states during the start‐up operation are shown. Several dynamic simulation results showing an interesting behaviour are presented. Through the examination of the profile evolutions corresponding to given start‐up policies, it can be seen how the column arrives to different steady states. It is shown that it is possible to identify a set of critical values for the start‐up supervision. Also, guidelines of general validity are achieved with the aim of finding the appropriate start‐up policy to obtain the desired solution.

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“…To solve this problem, Hwang proposed a nonlinear wave theory for a conventional distillation column. − This theory has been extended to a HIDiC by Liu et al On the basis of the nonlinear wave theory, the established nonlinear wave model can track the principal dynamic characteristics of the distillation process in a more concise form than the mechanism model. In consequence, advanced control schemes based on this wave model have been successfully designed for both the conventional distillation columns − and the HIDiCs. ,, …”

Section: Introductionmentioning

confidence: 99%

Nonlinear-Model-Based Control of a Heat Integrated Distillation Column Using Model Updating Based on Distributed Wave Velocity

Cong

Liu

2019

Ind. Eng. Chem. Res.

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A nonlinear-model-based control scheme for concentration profile position control of a heat integrated distillation column (HIDiC) is presented. First, a nonlinear wave model of the HIDiC is introduced to describe the concentration profile and its propagation velocity. Second, a distributed concentration wave profile velocity is developed to analyze the degree of the entire concentration profile deformation. Then, on the basis of the distributed wave velocity, a model updating method is proposed to determine a proper model parameter updating frequency so as to reduce the computing redundancy while guaranteeing the model accuracy. Finally, the nonlinear wave model and its updating method are combined to generate a model-based control scheme for the HIDiC, and controllers based on different model updating strategies are compared to evaluate the performance of the proposed model updating method.

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Startup of Distillation Columns Using Profile Position Control Based on a Nonlinear Wave Model

Cited by 28 publications

References 23 publications

Nonlinear wave modeling and dynamic analysis of internal thermally coupled distillation columns

Nonlinear wave modeling and dynamic analysis of internal thermally coupled distillation columns

An Extensive Analysis on the Start‐up of a Simple Distillation Column with Multiple Steady States

Nonlinear-Model-Based Control of a Heat Integrated Distillation Column Using Model Updating Based on Distributed Wave Velocity

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