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336 C.C.K. Beh and P.A. Webley/Adsorption Science & Technology Vol. 21 No. 4 2003 Figure 16. Purity response to a 5% feed valve increase. Oxygen purity at end of step 2, bed 1 feed. O2 purity dead time, ~ 2 cycles; time constant, ~ 5 cycles. Figure 17. Purity response to a 3% purge valve increase. Oxygen purity at end of step 2, bed 1 feed. O2 purity dead time, ~ 3 cycles; time constant, ~ 4 cycles. oxygen purity was used, indicating that some break through of the mass-transfer front had been permitted. Since the mass-transfer front was relatively sharp (10 to 20 cm as indicated from detailed simulations), any shift in the position of the mass-transfer front would produce a ‘pulse’ of product gas with a slightly different composition from 85%. The flow rate in the bed and the adsorptive capacitance of the bed dictate the position of the mass-transfer front. Hence, any per- turbations affecting flow and pressure would influence the position of the mass-transfer front and affect oxygen purity.PDF Image | Dynamic Response and Characteristics of an Oxygen Vacuum Swing Adsorption
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