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10 Appendix 98 By means of the same strategy, the quantification of individual flow coefficients Cv at different stem positions of particular control valves assembled in the PSA pilot-plant was performed. The results are presented in Fig. A.6-2–A.6-4 and Tab. A.6-1. Since the correct representation of pressure curves during the PSA cycle is crucial for the proper estimation of adsorption isotherms, as well as mass transfer kinetics, more complex investigation of Cv data should be considered, especially regarding the tail-gas pipeline. 10.7 Pressure drop along the packed-bed Fig. A.7-1 External experimental set-up for determination of pressure drop along the packed bed; and the empirical results The pressure of the inlet gas stream was manipulated with a manual pressure controller (PC), and the pressure difference between column inlet and ambient (ΔP) as well as feed stream flow rate (FM) were recorded. Two series of measurements were made: (1) with an empty column to determine the pressure drop on the packed bed supporting plate, and (2) with a filled column. The results are presented in Fig. A.7-1. Therefore, the pressure drop on the packed bed, as presented in Fig 2.2-4, was calculated as the difference of pressure drops determined during measurements with a filled and an empty column. Tab. A.7-1 Column geometry and experimental conditions Pressure drop along the packed bed was studied empirically in the external experimental set- up, the scheme of which is presented in Fig. A.6-1. The column’s geometry and operating conditions are given in Tab. A.6-1. The column was packed with adsorbent pellets with the snow-storm filling procedure, corresponding to the method of adsorbers packing in the PSA pilot-plant. The height of the packed bed was adjusted to represent the adsorbent volume in the PSA pilot-plant. Medium Bed length [m] Bed volume [m3] Packing density [g/L] Dry air 0.4 0.00201 667.88 Temperature [°C] 23 Bed diameter [m] 0.08 Cross-section area [m2] 0.005024PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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