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Dynamic Response/Characteristics of an Oxygen Swing Adsorption Process to Step Perturbations. Part 1 335 TABLE 1. Effect of Disturbances on VSA System Cyclic Steady-state Flows. Comparison of Experiment Baseline Feed valve, 5% increase Purge valve, 3% increase Product valve, 10% decrease 5 kPa product load disturbance Plant Model Plant Model Plant Model Plant Model Plant Model Feed flow (mmol/cycle) 6601.8 9129.79 +313 +313 125 0 31 0 31 0 and Model Product flow (mmol/cycle) 960.81 981.92 +125 +102 +31 +35 63 30 63 70 Evacuation flow (mmol/cycle) 5577.29 8147.87 +188 +237 125 35 +31 +56 +63 +70 Mass balance error (%) 0.97 6.45E–05 0.56 4.34E–04 1.1 2.72E–04 0.43 2.96E–04 0.43 1.07E–04 Figure 15. Change in system mass balance due to a 5% step in the feed valve position — comparison of pilot plant versus model. Pilot plant cyclic steady state attained in seven cycles; model cyclic steady state attained in four cycles. Figures 16–19 represent system responses to the four scenarios. In contrast to the pressure and flow responses shown previously, oxygen purity exhibited a measurable delayed reaction to the change (dead times between one to three cycles) and a significantly slower return to cyclic steady state (time constants of ca. four to six cycles). The concentration of oxygen in the product gas leaving a bed was governed by the extent to which the mass-transfer front was allowed to break through. In the experiments, a baseline of 85%PDF Image | Dynamic Response and Characteristics of an Oxygen Vacuum Swing Adsorption
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