Arithmetic approach for complex PSA cycle scheduling |
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Authors: | Amal Mehrotra Armin D Ebner James A Ritter |
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Institution: | 1.Department of Chemical Engineering, Swearingen Engineering Center,University of South Carolina,Columbia,USA |
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Abstract: | An algebraic model was derived for obtaining complex pressure swing adsorption (PSA) cycle schedules. This new approach involves
a priori specifying the cycle steps, their sequence and any constraints, and then solving a set of analytical equations. The solution
identifies all the cycle schedules for a given number of beds, the minimum number of beds required to operate the specified
cycle step sequence, the minimum number and location of idle steps to ensure alignment of coupled cycle steps, and a simple
screening technique to aid in identifying the best performing cycles that deserve further examination. The methodology was
tested successfully against 10, 12 and 16 bed PSA systems in the literature that all utilized the same 13 step cycle sequence
that has four pressure equalization steps. It completely resolved all the corresponding cycle schedules for these 13 step
multi-bed PSA systems with ease, and showed that the number of cycle schedules was hundreds to thousands of times greater
than the few ever reported in the literature for each one. Overall, this new methodology for complex PSA cycle scheduling
can be applied to any number of cycle steps, any corresponding cycle step sequence, and any number of constraints, with the
outcome being the complete set of cycle schedules for any number of beds greater than or equal to the minimum number it determines. |
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