Mathematical modelling of mass-transfer and hydrodynamics in CO2 absorbers packed with structured packings |
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Authors: | Adisorn Aroonwilas Paitoon Tontiwachwuthikul |
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Affiliation: | a Faculty of Engineering, University of Regina, Regina, Saskatchewan, Canada S4S 0A2 b Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1 |
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Abstract: | This paper presents a mechanistic model that can predict mass-transfer performance and provide an insight into dynamic behavior within structured packings used for CO2 absorption. The model was built upon the kinetics and thermodynamics of the absorption system, as well as the liquid irrigation features and the geometry of packing elements. A computer program (Fortran 90) was written to simulate CO2 absorption into aqueous solutions of sodium hydroxide (NaOH) and monoethanolamine (MEA) in a column packed with Gempak 4A, Mellapak 500Y and Mellapak 500X. The simulation gave essential information, including the concentration of CO2 in gas-phase, concentration of reactive species in the liquid-phase, system temperature, mass-transfer coefficients (kG and kL), and effective interfacial area (ae) for mass-transfer at different axial positions along the absorption column. The simulation also provided liquid distribution plots representing the quality of liquid distribution or maldistribution across the cross-section of the column. Verification of the model was achieved by comparing simulation results with experimental data. Very good agreement was found for wide ranges of operating and design parameters, including liquid load and initial liquid distribution pattern. |
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Keywords: | Absorption Carbon dioxide Mass-transfer Hydrodynamics Modelling Packed bed |
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