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5 Validation of the mathematical model 67 equalisation step. Therefore, enhanced oxygen transfer from the high-pressure column to the low-pressure column results in the packed-bed contamination, especially in the top section of the adsorber column. Consequently, the air demand value is significantly overestimated. Tab. 5.3.1-8 PSA performance at asymmetric pressure equalisation at reference process conditions at product purity level of 10 ppm O2 No. 1 2 3 4 5 Pressure equalisation (Top) + (Bottom) Productivity [m3n/h N2 / m3 CMS] Air demand [m3n/h air / m3n/h N2] EXP SIM Φ [%] EXP SIM Φ [%] (0)+(1) - - - - - - (1/2) + (2/2) 29.64 26.14 11.79 7.78 8.601 -10.55 (1)+(0) - - - - - - (1/3) + (2/3) 22.40 16.80 25.0 9.83 13.039 -32.64 (2/3) + (1/3) 25.70 25.10 2.33 8.65 8.962 -3.61 At both product purity levels, the relative error of simulation decreases with increasing flow resistance in the bottom equalisation pipeline. In this specific case, the gas is transferred mostly co-currently from the high-pressure column to the low-pressure column. Since the top section of the adsorber column is predominantly occupied by nitrogen, the effect of enhanced oxygen desorption causing the packed bed contamination is probably balanced with the gas near-wall channelling effect, which is inevitable in practice. Thus, the oxygen-enriched gas accumulates in columns voids and does not affect the separation performance within the adsorbent bed itself during the transition phase. The outcome is more pronounced at a product purity level of 10 ppm O2 rather than at 1000 ppm O2. Fig. 5.3.1-6 PSA performance at asymmetric pressure equalisation at reference process conditions at product purity level of 1000 ppm O2PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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