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Chapter 7. Conclusions and Future Research Directions based controller for purity control appears to be an ideal choice as it provides op- timal control action, while on other hand its design and validation, considering its highly nonlinear nature and inherently dynamic operation, present great chal- lenges. This work employs a systematic and rigorous framework for accomplishing this task. The detailed controller formulation also includes important constraints on manipulative variable, adsorption time to ensure a PSA system cycle which is neither too fast as it can lead to severe wear and tear of important PSA compo- nents, or is too slow which can cause irreversible adsorption situation in reality. Furthermore, as part of the system identification process, serious consideration has been given towards the design of the perturbation signal used to disturb the plant, as it plays a critical role in obtaining the true dynamic nature of the system. In this regard, two important features of the random pulse test signal, maximum pulse amplitude and its switching time, are investigated in detail. The maximum pulse amplitude is established by performing various hit and trial open loop simulations and a value of 3 seconds is finally selected, while three different values of switching time are selected leading to three best-fit reduced state space models of different sizes. It is important to note that the purpose of in-silico closed loop simulation is not only to find the best tuning parameters of the mp- MPC controller but also to simultaneously compare the effect of different optimal reduced linear models on the real time performance of the controller. The work also demonstrates that, in contrast to the conventional PID con- trollers, an explicit MPC controller, powered with a predictive model and con- straint handling feature in an optimization framework, provides twice as fast response time (for the step disturbance study) and also maintains the manipu- lative variable within the intended bounds, in response to the step and impulse disturbances considered in this study. 164PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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