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Chapter 7. Conclusions and Future Research Directions 7.1.2 Simultaneous Design and Control Optimization of PSA Under Uncertainty Following the work on the design of mp-MPC for the given PSA system, a detailed PSA optimization study is conducted, where design, operational and control as- pects of PSA system are considered simultaneously in order to obtain PSA system with superior real time operability in the face of disturbances. The simultane- ous approach followed here facilitates the incorporation of conflicting, design and control objective functions in an unified formulation while yielding an optimal PSA system which also obeys important operational constraints including prod- uct purity specifications. To accomplish the task, the decomposition based algorithm of Mohideen et al. [98] is employed comprising three main steps of feed composition uncertainty dis- cretization into three critical scenarios, then performing the multi-period dynamic optimization, and finally conducting the dynamic feasibility test. Another key feature of this study is the consideration of a variety of decision variables related to bed design and cyclic operation of PSA. In the context of cyclic operation, the time duration of PSA processing steps is also optimized. As part of the work, two detailed comparison studies are also conducted. In the first comparative study, the design and control configuration obtained from the simultaneous approach followed here is compared with the traditional sequen- tial approach, at nominal conditions. The results show that with the sequential approach, the actual recovery obtained in the presence of disturbances is around 60 %, which is much smaller than the 63 % recovery obtained at the optimal design conditions (with no disturbances). In contrast, the simultaneous approach provides almost 3 % extra real time recovery, in addition to providing better purity response. Furthermore, it is also found that the design obtained from 165PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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