Preliminaries Regarding General Modeling of the Cryogenic Distillation with Application to (13C) Iso-tope Separation

Gligan, M. L.; Dulf, Éva-Henrietta; Ungureşan, Mihaela-Ligia; Festila, C.

doi:10.1109/aqtr.2006.254516

Cited by 12 publications

(8 citation statements)

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“…Due to the very-low operating temperatures, the efficient thermal isolation vacuum jacket (M) is ensured by the vacuum pumps (PVP). The column operates with two zones: the stripping zone, from the feeding point to the top of the column and the enriching (rectifying) zone, in its lower part [2].…”

Section: A the Cryogenic Isotope Separation Processmentioning

confidence: 99%

“…The nonlinear model in (2) was developed using Matlab System Identification Toolbox, by identifying first order transfer functions between each input and output and estimating using Matlab, Basic Fitting the polynomials. Next using various sets of experimental data for each nonlinear differential equation in (2) the model parameters were identified by solving for each differential nonlinear equation a system of equations using Matlab Optimization Toolbox.…”

Section: The Nonlinear Model For the Isotope Separation Processmentioning

confidence: 99%

“…These models are, nevertheless, translations from a classical distillation process, and they can generally be used to determine in each moment and column-coordinate the concentration of the useful isotope, thus describing and modeling the isotope concentration distribution as a function of time and as a function of the column dimension [2,4]. However, they represent a rather poor choice for control purposes, since they fail to model the actual control signals and controlled outputs, mainly due to the fact that the control/controlled signals in the case of the cryogenic carbon monoxide distillation column differ consistently from those of a classical distillation column.…”

Section: Introductionmentioning

confidence: 99%

“…As far as the separation process model is concerned, there exist several models that could be used, such as those based on mass, component and energy balance equations [1,2], on the nonlinear wave theory [2] or the Cohen equations [2,3]. These models are, nevertheless, translations from a classical distillation process, and they can generally be used to determine in each moment and column-coordinate the concentration of the useful isotope, thus describing and modeling the isotope concentration distribution as a function of time and as a function of the column dimension [2,4].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Feedback linearization control design for the 13C cryogenic separation column

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Festila

Dulf

et al. 2010

2010 IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR)

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The separation of carbon isotopes represents a major research area due to the numerous uses of the least abundant carbon isotope, 13 C. One of the methods used for separating these isotopes is the cryogenic distillation, in large counter-current columns. Such industrial plants represent a difficult problem in terms of automatic control, since they are characterized by nonlinearities, large delay times and extremely severe control input constraints. The paper presents a control strategy based on a feedback linearization technique as an inner loop controller and a robust controller as the outer loop. The two are combined to result in a nonlinear robust control that achieves robust stability and robust performance for a certain amount of model uncertainties.

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Section: A the Cryogenic Isotope Separation Processmentioning

confidence: 99%

Section: The Nonlinear Model For the Isotope Separation Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Feedback linearization control design for the 13C cryogenic separation column

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Festila

Dulf

et al. 2010

2010 IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR)

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“…Based on the common features of both the carbon isotope separation process and the distillation process, a general model based on the Cohen equations is widely used (7) or based on mass and energy balance equations (8). The present work deals with another model that also finds its utility in control.…”

Section: Introductionmentioning

confidence: 99%

Systematic Modeling of the (¹³C) Isotope Cryogenic Distillation Process

Dulf

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Dulf

2012

Separation Science and Technology

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Isotopic enrichment by low-temperature distillation of carbon monoxide is difficult to handle, the experiments providing with the necessary data are time-consuming and difficult to perform, so the mathematical modeling of the process is an appropriate approach to study and to further control the column. This paper develops a mathematical model for the ( 13 C) isotope cryogenic distillation process using two subsystems of the plant: the hydrodynamic part and the isotope-separation part. The model is validated using experimental data from the pilot column from the National Institute for Research and Development of Isotopic and Molecular Technologies Cluj-Napoca. The proposed model is suitable for various cryogenic distillation columns, using the proper parameters.

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