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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System 70 Recovery, Pshell = 100000 Pa 80 Recovery, Pshell = 100 Pa 60 50 R Purity, Pshell = 100000 Pa Purity, Pshell = 100 Pa 70 60 50 eP c 40 u or vi 40 et ry 30 y % 20 10 30 % 20 10 00 0 0.5 1 1.5 2 2.5 3 3.5 4 Log10(1000xArea), m2 Figure 6.1: Variation of CO2 purity and recovery with membrane area for the upstream configuration the multiples of 10. The second parameter considered in the study is the shell side pressure for which two values of 1000 Pa and 100 Pa are chosen. Note that the pressure values selected here are significantly lower than the values selected for the upstream configuration study, to account for to the low operating pressure of the blowdown and purge processing steps of the PSA cycle. The third parameter selected is the input feed flow rate, for which values of 2 and 5 standard liters per minute (SLPM) are selected. Figure 6.2, shows the results obtained for CO2 recovery and purity as a variation of these parameters. It is clear from the plot that high values of both CO2 recovery and purity are achievable for the same value of membrane area values considered in the upstream configuration. For example, the highest value of recovery and purity in this case is more than 90 %. The comparative study presented here clearly indicates that downstream configuration is much more attractive than the upstream, and is the configuration selected for integration with PSA. 145PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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