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3 PSA dynamic model 26 Fig. 3.2-3 Experimental and simulated pressure profiles at the top of adsorber columns with adjusted controlled flow resistances in the PSA piping system: (a) during the entire PSA half-cycle, (b) during the initial phase of the PSA half-cycle Contemporaneously, the pressure drop caused by gas flow across the adsorbent fixed-bed is evaluated. In this study, the gas’ superficial velocity in the adsorbent fixed-bed is related to local pressure gradients along the adsorber length which are estimated according to the momentum balance expressed by the Ergun model as shown in Eq. 3.2-2. Fig. 3.2-4 Experimental pressure drop along the CMS packed bed represented by the Ergun model Tab. 3.2-1 Functions of linear valve models V applied in the process simulator Valve model V2, V3 V6, V7 V10, V11 V14, V15 * Function / Actual flow resistance Feed pipeline Tail-gas pipeline Equalisation pipelines Microfilter Action Control valve Ball valve Control valve Control valve Cv [kmol/s/bar] 5.0 × 10-1 - 2.5 × 10-5 9.5 × 10-4 V1 * Feed stream flow meter Control valve 9.0 × 10-4 V4, V5 Product pipeline Ball valve - V8, V9 Purge stream flow controller Flow controller - V12, V13 * Packed bed supporting plate Control valve 1.1 × 10-4 V16 Product stream flow controller Flow controller - * Represents an uncontrolled flow resistance in the piping systemPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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