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6 PSA process dynamics 75 Fig. 6-3 Mass transfer rate during the PSA reference cycle at 1000 ppm O2 at selected positions of adsorber length : (a) ∂w/∂t of oxygen; (b) ∂w/∂t of nitrogen; here nodes 1, 35, and 70 indicate the bottom, the middle, and the top of the column, respectively; here time ranges of 1 – 60 s and 61 – 120 s indicate the production and regeneration steps, respectively The superficial gas velocity in the adsorber column during PSA cycle at product purity levels of 10 ppm O2 and 1000 ppm O2 is presented in Fig. 6-4. The application of the co-current pressurisation by feed with simultaneous counter-current backflow of product results in significantly reduced superficial velocity during adsorption rather than during desorption. Furthermore, a fast counter-current flow rate of the oxygen-enriched gas during the blow-down step enables effective bed regeneration. At the time of equalisation steps, superficial velocity peaks towards positive values whenever the gas is transferred co-currently; and towards negative values whenever the gas is transferred counter-currently into the adjacent adsorber column. No significant difference in the gas superficial velocity is observed at different product purity levels; however, the production of the nitrogen of increased purity is associated with a slightly slower flow of the gas through the column. Fig. 6-4 Gas superficial velocity during the PSA reference cycle at different product purity levels at selected positions of adsorber length: (a) during the production; (b) during the regeneration; here nodes 1 and 70 indicate the bottom and the top of the column, respectivelyPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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