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5 Validation of the mathematical model 71 Fig. 5.3.2-3 Experimental and simulated pressure profiles of N2-receiver tank at different N2-receiver volumes: (a) 12 L, (b) 7 L, (c) 5 L 5.4 Accuracy evaluation of the results The relative error of simulated PSA performance indicators increases significantly with increased nitrogen purity. At the investigated product purity of 10 ppm O2, the largest deviation equals 51.80 % in case of productivity and -89.45 % in case of air demand, which was detected while the PSA operation with 5 L N2-receiver tank. In contrast, at product purity of 1000 ppm O2, the largest deviation equals 38.99 % in case of productivity and -35.40 % in case of air demand, which was identified during the PSA operation with asymmetric exploitation of equalisation valves, while the top valve is fully-opened and the bottom valve is fully-closed. Fig. 5.4-1 Experimental and simulated temperature profiles at selected positions of the adsorber during the PSA reference cycle: (a) at product purity of 1000 ppm O2, (b) at product purity of 10 ppm O2 Due to the fact that the slopes of presented performance indicators curves become significantly larger at increased purity requirement, every minor inaccuracy in oxygen concentration measurement, even in the range of observational error, has a substantial impact on thePDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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