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For the binary mixture of H2:CH4 for different feed pressures at a constant feed flow rate the effect of the number of discretization points was studied and the results are presented in Figure 4.3. Figure 4.3 Comparison of a breakthrough simulation with gPROMS® model for a mixture of hydrogen and methane using 10, 40 and 80 discretization points per layer The results of the present simulations showed that for a lower number of discretization points (10 discretization points per layer) a more dispersive breakthrough curve is obtained, when compared with the simulations for a higher number of discretization points. When comparing the simulations with 40 discretization points per layer with the ones with 80 discretization points per layer, it can be seen that the difference between them is not significant. Taking into consideration that the higher the number of discretization points the higher the time that required for the simulation to be performed, it was agreed to use 40 discretization points per layer in all the simulations concerning the Langmuir-Freundlich isotherm model. Figure 4.4 shows the comparison of the simulation breakthrough curves with the experimental data provided by the literature [31]. The increase of the feed pressure results in a higher adsorption capacity of the PSA column as can be seen in Figure 4.4, resulting in a later breakthrough time for higher pressures. When it comes to the comparison of the breakthrough times, gPROMS® model provides a fair prediction relatively to the experimental data. However, the difference between the values obtained through simulation and the experimental data increases slightly as the feed pressure increases. Although the increase in the number of discretization points from 10 to 40 provided a better approximation between the experimental and simulation breakthrough curves, a small difference between the slopes of both curves can be seen in Figure 4.4, which could be a consequence of a higher prediction of 𝑞 by gPROMS®. Pressure Swing Adsorption for Hydrogen Purification 1 0,95 0,9 0,85 0,8 0,75 0,7 16 atm, 80 dp 16 atm, 40 dp 16 atm, 10 dp 10 atm,80 dp 10 atm, 40 dp 4 atm, 10 dp 4 atm, 80 dp 4 atm, 40 dp 4 atm, 10 dp 0 500 1000 time (s) Modelling and Simulation 24 molar fractionPDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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