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Pressure Swing Adsorption for Hydrogen Purification 1 0,95 0,9 0,85 0,8 0,75 0,7 Exp P = 4atm sim. P = 4 atm Exp. P = 10 atm sim. P = 10 atm Exp. P = 16 atm sim. P = 16 atm 0 200 400 600 800 1000 1200 1400 time (s) Figure 4.4 - Comparison between the simulation and experimental breakthrough curves for pressures of 4, 10 and 16 atm for a binary mixture of H2/CH4 at a feed flow rate of 6.8 SLPM The effect of the feed flow rate was then analysed employing the same mixture composition from the simulation above. Simulation results were compared with the experimental data [31]. 1 0,95 0,9 0,85 0,8 0,75 0,7 sim. 4.5 SLPM exp. 4.5 SLPM sim. 6.8 SLPM exp. 6.8 SLPM sim. 9.1 SLPM exp. 9.1 SLPM 0 500 1000 time (s) Figure 4.5 - Effect of the feed flow rate in the experimental and simulated breakthrough curves for a binary mixture of H2/CH4 at a feed pressure of 10 atm Figure 4.5 shows that when increasing the feed flow rate the breakthrough time decreases due to the smaller residence time while, when decreasing the feed flow rate a higher breakthrough time is obtained. The comparison of the simulation results with the experimental data suggests that for higher feed flow rates a good prediction of the breakthrough time of the mixture is obtained with gPROMS® model. However, for a feed flow rate of 4.5 SLPM a difference of 80 seconds between the simulation and experimental breakthrough time is observed. Modelling and Simulation 25 molar fraction (H2) molar fraction (H2)PDF Image | PRESSURE SWING ADSORPTION FOR THE PURIFICATION OF HYDROGEN
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