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Table 5.6 Cycle specifications for long column cycles in pressure drop study Cycle 5 Cycle 6 Cycle 7 Cycle 8 Production step superficial velocity (cm/s) 11.6 16.6 22.9 39.7 Feed Press./Production (s) Blowdown (s) Purge (s) 7.2 5 2.2 4.7 3.5 1.2 3.2 2.2 1 1.7 1 0.7 Total cycle Eq. (s) time (s) 0.3 15 0.3 10 0.3 7 0.3 4 Cycles 5-8: Pressure ratio 2.5, P/F ratio 0.6, product purity: 96% oxygen , production step pressure ~195 kPa, synthetic air Cycle 9 20.7 Cycle10 29.8 Cycle 11 48.1 Cycle 12 52.6 4.5 3.5 1 3 2 1 1.5 1 0.5 1.3 1 0.3 0.5 10 0.5 7 0.5 4 0.5 3.6 Cycles 9-12: Pressure ratio 4.5, P/F ratio 0.4, product purity: 96% oxygen , production step pressure ~195 kPa, synthetic air 5.5.8 Minimum BSF Study The next experimental PSA study was conducted to determine if a minimum BSF occurs in the system. The main difference between these experiments and the pressure drop study is that the process was simplified to a 4-step cycle in order to avoid the complications of an equalization step on process performance. While a significant advantage is gained through an equalization step, it adds additional uncertainty into the analysis since it is difficult to measure. Considering the goal of this study was measuring and explaining the existence of a minimum BSF, not maximizing performance, an equalization step was not necessary. The cycle steps include: 1) feed pressurization 2) production 3) counter-current blowdown 4) counter-current purge. 96PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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