Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants

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Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants ( modelling-and-simulation-twin-bed-pressure-swing-adsorption- )

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II Table of Contents III II I II III IV V VI 1 1.1 1.2 1.3 2 2.1 2.1.2 Isostere method .................................................................................................... 13 2.1.3 Ideal Adsorbed Solution Theory .......................................................................... 15 2.2 Adsorption kinetics.................................................................................................... 16 2.2.1 LDF model ........................................................................................................... 17 2.2.2 QDF model ........................................................................................................... 18 2.2.3 Darken correction ................................................................................................. 19 PSA dynamic model ....................................................................................................... 21 Table of Contents Acknowledgments ........................................................................................................... II Table of Contents............................................................................................................ III List of Figures .................................................................................................................. V List of Tables ............................................................................................................... VIII List of Symbols and Abbreviations ................................................................................. X Abstract ........................................................................................................................ XIII Introduction....................................................................................................................... 1 Nitrogen production via PSA technology.................................................................... 4 State of knowledge ...................................................................................................... 7 Motivation and purpose of scientific work .................................................................. 9 Theoretical background .................................................................................................. 11 Adsorption equilibrium.............................................................................................. 11 2.1.1 Sips isotherm ........................................................................................................ 12 3 3.1 3.2 3.3 3.4 3.5 4 4.1 4.2 4.3 4.4 4.5 5 5.1 5.1.2 Adsorption pressure.............................................................................................. 49 5.2 Effect of cycle organisation ....................................................................................... 52 Mass and energy balances ......................................................................................... 22 Pressure drop ............................................................................................................. 24 Adsorption equilibrium.............................................................................................. 27 Isosteric heat of adsorption ........................................................................................ 30 Mass transfer kinetics ................................................................................................ 31 Experimental program .................................................................................................... 35 Selected adsorbent ..................................................................................................... 35 PSA pilot-plant .......................................................................................................... 36 Cycle organisation ..................................................................................................... 39 Performance indicators .............................................................................................. 40 Measurement accuracy .............................................................................................. 42 Validation of the mathematical model............................................................................ 47 Effect of operating conditions ................................................................................... 47 5.1.1 Operating temperature .......................................................................................... 47

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