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3 PSA dynamic model 29 of the multi-component calculation by the IAST approach. air mixture (20 vol.-% O2 and 80 vol.-% N2) was experimentally studied in order to validate the correctness Fig. 3.3-3 (a) experimental adsorption isotherms of synthetic air mixture on the CMS represented by the IAST model; (b) the absolute value of relative error of the equilibrium loading with the IAST model The results are plotted in Fig. 3.3-3a. The IAST calculation underestimates the experimental multi-component adsorption equilibrium data in the whole pressure range at 20 and 40 °C. At 60 °C, the experimental data are overestimated up to about 5 bar abs and underestimated posteriorly. However, the accuracy of the equilibrium prediction exhibited here is acceptable. As presented in Fig. 3.3-3b, in the pressure range of practical application of the PSA system i.e. 1 – 10 bar abs, the maximal absolute relative error of IAST estimation equals 11.2 % at 20 °C, 1.84 % at 40 °C, and 5.07 % at 60°C. Moreover, considering the PSA operation, increased deviations in the equilibrium loading are observed during the desorption rather than the adsorption step. For that reason, the relative error at atmospheric pressure level is significantly higher than at adsorption pressure levels while considering 20 and 60 °C. At 40 °C, the estimation error is rather insensitive to the variation of system pressure. Fig. 3.3-4 Graphical representation of the local equilibrium concept The equilibrium data were collected in the pressure range of 0 – 20 bar abs at temperature levels of 20, 40, and 60 °C.PDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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