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5 Validation of the mathematical model 53 When the low-purity (1000 ppm O2) product is generated the productivity increases as the half- cycle time is shortened. This finding confirms that the multiplication of the number of cycles per hour brings benefits for the process performance as the kinetic selectivity is exploited further. As such, the premature breakthrough of the adsorbent fixed-bed does not occur, even at relatively high gas superficial velocity causing extended oxygen MTZ. By the reduction of half-cycle time to 40 sec, productivity is increased by 11.5 %. Although, the opposite effect is found when the high-purity (10 ppm O2) product is generated. In that case, the productivity decreases as the half-cycle time is shortened. It means that either the time provided for a mass transfer is insufficient and, thus, the diffusivity limit was encountered; or a premature column breakthrough occurs due to axial dispersion effects during the pressurisation step. Nevertheless, the observation could also be explained as a combination of both effects. Fig. 5.2.1-1 PSA performance at different half-cycle times: (a, b) productivity; (c, d) air demand; (a, c) as a function of product purity; (b, d) as a function of half-cycle time At every investigated process condition, the reduction of the half-cycle time results in an increased air demand due to the aforementioned change of time proportion for the different steps in the cycle. The adjustment of short half-cycle times makes the pressurisation step morePDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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