Energy Efficiency of Gas Separation Pressure Swing Adsorption

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Energy Efficiency of Gas Separation Pressure Swing Adsorption ( energy-efficiency-gas-separation-pressure-swing-adsorption )

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4.2.4 Ideal Three-Step Cycle The next cycle analyzed is the Ideal Three-Step cycle. In this cycle, the low- pressure is zero atm, which implies that the pressure ratio is infinite. Although the high pressure PH chosen does not affect the overall work done per mole of product oxygen, it does affect the absolute values of work done, and must be included in the calculations. The system energy and molar flows for this cycle are shown in Figure 4.10. Feed, NF NPR NPI WPR WR N p 2 Product, NP 2 WF WE Isothermal Compressor Figure 4.10 Ideal Three-Step Cycle: Energy and Molar Flows. —• Exhaust, NE The blowdown and purge work have been combined into the evacuation work. Also, product gas is only diverted for use in the pressurization step; for this reason there is more product gas left at the end of the cycle. Both the recovery and the productivity are much higher than those of the Four-Step cycle. The results of the calculations can be seen in the third column of Table 4.4, and the Grassman diagram is shown in Figure 4.11. 112

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