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Chapter 5. Simultaneous Design and Control Optimization of PSA Systems Under Uncertainty slower to settle down as compared to pressure swing and also has an unfavorable effect on the PSA performance due to the temperature rise during the adsorption stages and drop during the desorption stages. Furthermore, it also reveals that the repressurization at CSS is much faster than the blowdown, as the bed pressure at the end of blowdown stage has not reached the lowest pressure possible. 5.5 Comparisons With A Sequential Strategy Table 5.11 compares the optimal PSA operational configurations obtained from the application of sequential and the simultaneous approaches while assuming perfect certainty in feed composition at yH2 = 70 %. The results shows that if the ISE is kept around the same value obtained from the sequential approach, the simultaneous approach provides better closed loop recovery. In this case, the actual recovery possible is 61.638 % which is almost 3 % higher (on relative basis) than the recovery obtained with the sequential approach. When comparing the results in different columns of Table 5.11, it should be noted that tfeed is the duration of the feed step for the sequential analysis, while it is the initial value (bias value) of PI control law for the simultaneous optimization studies. It is also evident from the results that the simultaneous approach lead to a design which is marginally bigger in size with respect to both diameter and length (as L/D ratio is unchanged). The largest change is observed in the step durations of the PSA cycle, as the simultaneous optimization based approach predicts higher time duration for all processing steps at optimal CSS conditions in comparison to the sequential approach. These observations suggests that the simultaneous approach results in a bigger and slower PSA system in an attempt to effectively handle specified disturbances, while also increasing the closed loop recovery at CSS conditions. 129PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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