Operation and Control of Pressure Swing Adsorption Systems

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Operation and Control of Pressure Swing Adsorption Systems ( operation-and-control-pressure-swing-adsorption-systems )

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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System Table 6.4: Hybrid performance indicators vs. PSA cycletime for membrane area of 0.1 m2 tcycletime P urH2 400 100 432 99.996 440 99.993 448 99.989 456 99.982 480 99.94 RecH2 P rodH2 44.098 37.55858 64.333 54.79314 PurCO2 64.152 77.496 RecC O2 27.497 33.47 33.796 34.108 34.397 35.187 65.493 55.78157 78.173 66.606 56.72901 67.64 57.60938 70.436 59.99128 78.817 79.411 81.012 increasing PSA cycletime decreases H2 product purity and increases H2 product recovery, adsorbent productivity, CO2 purity, and CO2 recovery. The highlighted row in each table represents the maximum time for which the H2 purity constraints are met and thus represents the optimum point for the particular value of membrane area. H2 product recovery for these cycletime values is compared against the membrane area in the Figure 6.4. On the abscissa is the membrane area in m2, where a value of zero indicates the corresponding point for the standalone PSA. The plot also shows that as the area increases, the recovery goes through a maximum, and compared with the stand alone PSA case, increase in overall hydrogen recovery of more than 10 % has been achieved. Therefore, if maximizing the PSA hydrogen product recovery is the only criterion for hybrid design, then membrane area of 0.1 m2 seems to give the best performance. 152

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Operation and Control of Pressure Swing Adsorption Systems

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