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Chapter 5. Simultaneous Design and Control Optimization of PSA Systems Under Uncertainty BED1 BED 2 Feed 70%H2 +30%CH4 DEP BLDN PURGE PE REPRES FEED 99.99 % H2 Purge line Depressurization line Off gas Temperature sensors Switch valves PE REPRES FEED DEP BLDN PURGE Figure 5.1: Two-bed, 6-step, multi-valve PSA configuration employed for this study. FEED: production step; DEP: co-current depressurization; BLDN: counter-current depressurization or blowdown; PURGE: counter-current purge with product; PE: co-current pressure equalization; REPRES: co-current re- pressurization with feed slow but true evolution to the CSS. 5.2 PSA Details and Problem Description 5.2.1 Modeling Details Figure 5.1 depicts a graphical overview of the two-bed PSA system under consid- eration. Each bed is undergoing a cyclic operation comprising six processing steps and contains activated carbon as the adsorbent. Furthermore, it is also assumed that the structure of PSA cycle and sequence of processing steps remains fixed 108PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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