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Table 5.12 Cycle specifications for short column cycles with pressure ratio 3 in minimum BSF study Production step superficial velocity (cm/s) 20.0 19.6 36.8 44.3 49.5 28.5 Feed Press./Production (s) 3.2 3.2 1.85 1.6 1.47 2.32 4.64 5.6 PSA Model Framework Blowdown (s) 2.6 2.7 1.5 1.3 1.2 1.9 3.8 Purge (s) 0.6 0.5 0.35 0.3 0.27 0.42 0.84 Total cycle time (s) 6.4 6.4 3.7 3.2 2.94 4.64 9.28 Cycle 34 Cycle 35 Cycle 36 Cycle 37 Cycle 38 Cycle 39 Cycle 40 P/F ratio 0.47, product purity: 96% oxygen , production step pressure ~195 kPa, synthetic air 14.1 The primary aim of this work was experimental in nature. However, in order to better illustrate the effects of pressure drop and more accurately measure the MTZ, an in- house simulator developed by Dr. Sridhar Ungarala was used to provide further information not available from experimental data, particularly column profiles. Only a brief description of the more relevant aspects of the model is presented here, the complete model is provided in Appendix A. The model is non-isothermal and assumes axially dispersed plug flow with ideal gas behavior and negligible radial concentration and temperature gradients. Pressure drop is included through the Ergun equation. 100PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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