A dynamic analysis of a packed gas absorber

Bradley, Kate; Andre, Hanalde

doi:10.1002/cjce.5450500415

Cited by 13 publications

(4 citation statements)

References 13 publications

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“…However, significant developments have taken place since. Bradley and Andre (1972) presented a dynamic analysis of a packed absorber of C02 into an aqueous MEA solution, assuming plug flow of gas and liquid phases among other simplifying considerations. Data from steady-state experiments were used to correlate empirically the mass transfer rate coefficient and liquid hold-up.…”

mentioning

confidence: 99%

Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments

Escobillana¹,

Saez²,

Neuburg³

et al. 1991

Can J Chem Eng

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A model is presented for the steady‐state simulation of a CO2 recovery pilot plant with aqueous monoethanolamine (MEA) solutions. CO2 absorption is performed in a column packed with 2.54 cm ceramic Pall rings. CO2 recovery is achieved in a 20 sieve tray steam stripping column. The packed column absorption model was fitted to the experimental data using the specific interfacial area of the irrigated packing as an adjustable parameter. The equivalent average bubble diameter was used as the adjusting parameter in the sieve tray stripping column. Modelling of both towers reproduces within 3% average error concentrations measured in a pilot plant. Measured temperatures were also well correlated.

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mentioning

confidence: 99%

Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments

Escobillana¹,

Saez²,

Neuburg³

et al. 1991

Can J Chem Eng

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“…In these systems, the special difficulties resulting from the split boundary nature of countercurrent processes do not arise. A few papers (Bradley and Andre, 1972;Lee et al, 1973;Gawdzik, 1979) on countercurrent processes do not focus on the details of the numerical methods and are primarily studies of process dynamics or control of specific systems. These papers do not provide accuracy and efficiency checks of their numerical solutions and do not provide sufficient detail enabling the facile extension of the numerical methods to other systems.…”

Section: Introductionmentioning

confidence: 99%

Numerical methods of solution for continuous countercurrent processes in the nonsteady state part I: Model equations and development of numerical methods and algorithms

Tan

Spinner

1984

AIChE Journal

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Simple, efficient and noniterative algorithms are developed for the calculation of the dynamics of continuous countercurrent processes described by hyperbolic differential equations. The algorithms are derived using the method of characteristics and are particularly useful for either general quadratic or hyperbolic isotherms such as the Langmuir isotherm. The use of characteristic coordinates for the numerical solution avoids accumulating errors that would arise from computations based on a rectangular grid of real time and space coordinates.The proposed methods can provide an efficient framework for extension to transport processes with general nonlinear rate expressions. The algorithms and methods initially derived for simple models can be extended to more complex systems such as countercurrent flow with accumulating stationary phases and response to distributed disturbances.The application of the algorithm and methods to a number of countercurrent mass and heat transfer processes will be illustrated in Part 11, where the accuracy and efficiency of the proposed methods will also be demonstrated by comparison to available analytic solutions. An example demonstrating the extension of the method to a system with complex coupled boundary conditions will also be discussed. SCOPEThe purpose of this paper is to present a simple, efficient and accurate numerical method which can facilitate the determination of the dynamic behavior of countercurrent heat and mass transfer processes. Although the steady-state behavior of these processes can be usually analyzed quantitatively, the same cannot be said for the transient state. Simple general analytic solutions for the nonsteady state are not readily obtainable, partly due to the presence of split boundary conditions. The most general form of analytic solution (Jaswon and Smith, 1954) is in a complicated series form and the evaluation even for relatively simple boundary conditions is difficult and time-consuming, requiring lengthy computer calculation. The simultaneous partial differential equations for nonsteady-state countercurrent processes have thus been evaluated numerically by many authors in a variety of ways. These include application of finite difference methods and the use of cell or lumped parameter models. Both methods have been shown to implicitly involve a dispersion term which smooths and spreads the discontinuous wave behavior of the hyperbolic equations often used to model countercurrent processes. Attempts to represent the discontinuity by decreasing the size of the increments of finite difference schemes or by increasing the number of cells in lumped parameter models can lead to lengthy computation.The method of characteristics transforms the simultaneous hyperbolic partial differential equations to a set of ordinary K. S. TAN and 1. H. SPINNER Department of Chemical Engineering andApplied Chemistry University of Toronto Toronto, Ontario, Canada differential equations which can be integrated numerically by standard methods. Acrivos (1954) indicated the pos...

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“…Vaporization efficiencies were obtained from operating data. Bradley and Andre (1972) studied the dynamic response of a packed tower (0.076-m i.d., 2.82 m long) in which carbon dioxide was absorbed from an air-carbon dioxide mixture into aqueous monoethanolamine. The differential equations were simplified by making suitable assumptions and solved analytically using the method of characteristics.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear model predictive control of a packed distillation column

Patwardhan¹,

Edgar²

1993

Ind. Eng. Chem. Res.

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A dynamic analysis of a packed gas absorber

Cited by 13 publications

References 13 publications

Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments

Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments

Numerical methods of solution for continuous countercurrent processes in the nonsteady state part I: Model equations and development of numerical methods and algorithms

Nonlinear model predictive control of a packed distillation column

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A dynamic analysis of a packed gas absorber

Cited by 13 publications

References 13 publications

Behaviour of absorption/stripping columns for the CO2‐MEA system; Modelling and experiments

Behaviour of absorption/stripping columns for the CO2‐MEA system; Modelling and experiments

Numerical methods of solution for continuous countercurrent processes in the nonsteady state part I: Model equations and development of numerical methods and algorithms

Nonlinear model predictive control of a packed distillation column

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Product

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Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments

Behaviour of absorption/stripping columns for the CO₂‐MEA system; Modelling and experiments