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columns have twice the pressure drop per unit column length as the shorter columns. This indicates column pressure drop is not affecting the high pressure concentration profile. Figure 6.10 compares the concentration profiles between the two cycles at the end of the purge step. The profiles are once again nearly the same despite the higher pressure drop of the longer columns. As with the production step, column pressure drop has little impact on the low pressure concentration profile. Table 6.3 Comparison of experimental and simulation results at similar cycle times and different column dimensions. (TPD = tons per day) experiment Cycle time (s) 6.8 Product purity (% oxygen) 96 Oxygen recovery (%) 45.5 BSF (lbs. solid/TPD O2) 81 simulation experiment 6.83 7 7.08 96.2 96 96 45.5 50.3 50.2 83.6 80 76.7 Short columns: cycle #3 Long columns: cycle #10 simulation Production step pressure drop (kPa/cm) 0.19 0.16 0.29 0.34 Total pressure drop as % of production step 0.95 pressure Purge step pressure drop (kPa/cm) Total pressure drop as % of purge step pressure 0.80 2.9 3.4 - 0.28 - 6.4 - 24.6 - 0.54 118PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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