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concentration with 5A zeolite there is 78% more-adsorbed gas (nitrogen) and 22% less- adsorbed gas (21% oxygen and 1% argon). This makes little difference in the final analysis. Table 4.2 lists the pressure limits of the cycle used in the comparison to Banerjee's work. As the low pressure is 1 arm, no energy is required for the blowdown and purge, as is necessary when PL is less than atmospheric. Table 4.2 Cycle Properties used in theEnergy Comparison. PL 101,325 {Pa} Low pressure of the cycle (atmospheric) High pressure of the cycle Pressure ratio 1,580,670 {Pa} n 15.6 {-} PH Table 4.3 lists the number of moles in each step, as well as the average mole fractions of these gases. The inputs to the model (NF, yoand yp) are calculated using the equations developed by Knaebel and Hill (1985). The equations for NBD, yBD, N w , yw, NE, and yEhave been derived earlier in this thesis. The availabihty of the gas leaving the PSA system depends on the outlet gas concentrations and molar quantities. The mole fraction of the gas leaving the system during the blowdown step is higher than air, mdicating that the blowdown gas been enriched in nitrogen. The mole fraction of the gas leaving the system during the purge step is actually less than that of air, mdicating that some of the gas exhausted during the purge step is actually enriched in oxygen. The values NE and ys represent the total quantity and composition of the exhaust gas, which is the combination of the blowdown and purged gas. The table also lists the number of moles of product generated and used in the purge and pressurization steps. Note that most of the product is used in the 100PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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