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Chapter 5. Simultaneous Design and Control Optimization of PSA Systems Under Uncertainty 5 x 10 7 6 5 4 3 2 1 0 0 89 123 407 Time, Sec 310 309 308 307 306 305 304 303 302 301 300 496 530 815 DEP BLD N PURGE PE P RES FEED Figure 5.5: Time evolution of pressure swing and the associated temperature swing over a PSA cycle at the optimal conditions as the methane concentration falls sharply. By the end of purge step, the impurity level in the bed has reached its minimum level. During the pressure equalization by product and pressurization by feed step, the column is pressurized back to the feed pressure. It is important to note that substantial adsorption in the bed can happen during the re-pressurization with feed step. This demands a fast re-pressurization step, where the gas phase concentration increases much faster than the solid phase concentration. A closer comparison of Figures 5.3 and 5.4 confirms this behavior where it can be seen that the area under the curve rises much sharply for CC H4 than QC H4 , while moving from PE step to PRES step. In fact detailed calculations performed shows that the CCH4avg (Eq. 5.13) increases twice as fast as QCH4 avg. Figure 5.5 depicts the complex interactions between the pressure swings, and the corresponding temperature swings for one complete PSA cycle for the first bed. From this plot, it can been deduced that the temperature swing cycle is much 128 Average bed pressure, Pa Average bed temperature, KPDF Image | Operation and Control of Pressure Swing Adsorption Systems
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