Operation and Control of Pressure Swing Adsorption Systems

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Operation and Control of Pressure Swing Adsorption Systems ( operation-and-control-pressure-swing-adsorption-systems )

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4.2 Framework for multi-parametric programming and explicit/multi- parametricMPC ........................... 68 4.3 Four bed, 9 step multi-valve PSA configuration employed for this study. FEED: production step; DEP1: first co-current depressur- ization; DEP2: second co-current depressurization; DEP3: third co-current depressurization; Bd: counter-current depressurization or blowdown; Pu: counter-current purge; PE 1: first co-current pressure equalization; PE 2: second co-current pressure equaliza- tion; REPRES: counter-current re-pressurization with product. . . 70 4.4 Variation of hydrogen purity and recovery with each PSA cycle for thebasecasePSA .......................... 75 4.5 Hydrogen axial concentration profiles at CSS at end of each PSA processstep.............................. 76 4.6 Methane axial concentration profiles at CSS at end of each PSA processstep.............................. 78 4.7 Evolution of axial temperature profiles with PSA cycles . . . . . . 79 4.8 PSA purity response to adsorption time pulses with switching times of5and20cycles........................... 81 4.9 PSA purity response to adsorption time pulse with switching time of79cycles .............................. 82 4.10 Comparison of simulated output data from the 8th order state space model (Eq. 4.22 to 4.25) with the high fidelity PSA model . . . . 84 4.11 Variation of hydrogen purity and recovery with adsorption time at CSSforthebasecasePSA...................... 87 4.12 Cyclewise variation of hydrogen purity with adsorption time . . . 88 15

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Operation and Control of Pressure Swing Adsorption Systems

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