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Chapter 7. Conclusions and Future Research Directions purity hydrogen of 99.99 % quality from a five component feed stream of CO, H2, CO2, CH4, N2. Here, the main design objective is to improve the overall opera- tional hydrogen recovery, as compared to the stand alone PSA separation system. Furthermore, environmental impact of the designed hybrid is also calculated by evaluating its cumulative global warming potential. 7.3 Future Research Directions 7.3.1 PSA Control Improvements In the future studies, it will be worthwhile to investigate the effect of off-gas tank dynamics on the purity controller performance, and also to include its own con- troller details with in the overall MIMO MPC controller formulation for PSA. The main purpose of the off-gas tank is to minimize the flow and pressure fluc- tuations resulting from the blowdown and purge steps of the PSA cycle. The off-gas tank controller gains further significance in scenarios where PSA is a part of a bigger reaction-separation system, such as the purification unit of the steam methane reforming process. Here, the controller objective is to ensure that the off-gas stream finally leaving the purification unit has steady flow and pressure characteristics. Further studies should also be carried out to understand, if having multi- ple measurements within one PSA cycle (higher sampling frequency), actually improves the controller performance. Ultimately, the explicit/multi-parametric controller design should be made robust [121], to obtain better performance in the presence of modeling uncertainties and operational noises. 169PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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