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5 Validation of the mathematical model 49 highest relative error of the simulated productivity results also in the highest relative error of the simulated air demand at the same measurement point. Tab. 5.1.1-1 PSA performance at different operating temperatures at product purity of 1000 ppm O2 Temperature [°C] Productivity [m3n/h N2 / m3 CMS] Air demand [m3n/h air / m3n/h N2] EXP SIM Φ [%] EXP SIM Φ [%] 5 89.62 20 97.35 36 93.50 82.20 8.28 97.60 -0.26 95.60 -2.25 3.13 3.253 -3.93 3.18 3.147 1.04 3.45 3.428 0.64 12 95.00 91.00 4.21 3.12 3.164 -1.41 28 97.42 99.00 -1.62 3.24 3.239 0.03 45 85.87 86.01 -0.17 3.77 3.810 -1.06 Tab. 5.1.1-2 PSA performance at different operating temperatures at product purity of 10 ppm O2 Temperature [°C] Productivity [m3n/h N2 / m3 CMS] Air demand [m3n/h air / m3n/h N2] EXP SIM Φ [%] EXP SIM Φ [%] 5 26.06 18.50 20 29.64 26.14 36 24.60 20.78 5.1.2 Adsorption pressure 29.01 7.65 10.435 11.79 7.78 8.601 15.52 9.78 11.681 -36.41 -10.55 -19.44 12 28.10 23.65 15.83 7.72 8.854 -14.69 28 28.36 25.00 11.85 8.28 9.431 -13.90 45 19.80 11.30 42.93 12.73 21.587 -69.58 As the compression of air is a dominating factor of PSA operating costs, the adsorption pressure is mainly determined by economical constraints defined by the plant operator. Therefore, the influence of adsorption pressure on PSA performance indicators is investigated in the range of 6 – 10 bar abs. The results are presented in Tab. 5.1.2-1–2 and Fig. 5.1.2-1. Tab. 5.1.2-1 PSA performance at different adsorption pressures at product purity of 1000 ppm O2 Pressure [bar abs] Productivity [m3n/h N2 / m3 CMS] Air demand [m3n/h air / m3n/h N2] EXP SIM Φ [%] EXP SIM Φ [%] 6 68.00 73.50 -8.09 3.27 8 97.35 97.60 -0.26 3.18 10 116.48 114.60 1.61 3.13 3.217 1.62 3.147 1.04 3.198 -2.17 7 82.65 86.35 -4.48 3.19 3.164 0.82 9 109.69 107.00 2.45 3.1 3.160 -1.94 Fig. 5.1.2-1 shows that the process simulation is capable to predict the influence of the operating pressure very well in the whole investigated pressure range.PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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