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Chapter 5. Simultaneous Design and Control Optimization of PSA Systems Under Uncertainty Table 5.3: A brief overview of important literature studies on PSA optimization Authors Smith and West- erberg [151] Nilchan and Pan- telides [104] Ko et al. [79] Jiang et al. [68] Jiang et al. [69] Cruz et al. [36] Nikoli ́c et al. [103] Agarwal et al. [2] PSA system H2 -CH4 , H2 separation bulk Modeling details Very simplified model, comprising time aver- aged mass and energy balances General framework for periodic adsorption processes Constant superficial velocity Nonisothermal opera- tion, steady state mo- mentum balance Nonisothermal and steady state momen- tum balance, bed dispersion neglected Non isothermal opera- tion, model formulated in the dimensionless form to reduce number of variables, employed empirical pressure profile for pressuriza- tion/depressurization stages Detailed and generic modeling framework [102] Detailed model linear superficial velocity pro- files CSS acceleration Not required Complete discretiza- tion of spatial and temporal derivatives, CSS evaluated by ex- pressing spatial pro- file of differential vari- ables in empirical ex- pressions Direct determination approach augmented with a hybrid trust region method for Newton step improve- ment Direct determination approach [68] Not considered Unibed approach Performed model re- duction employing proper orthogonal collocation Optimization formula- tion MINLP NLP NLP NLP NLP NLP NLP, re- peated optimiza- tion for optimal number of beds for pre de- fined PSA cycles NLP Ob jective function Capital and op- erating costs Average power Maximize CO2 and N2 purity O2 recov- ery and specific work H2 recov- ery Recovery and power consump- tion Recovery Recovery Single bed RPSA for air separation and two bed, six step PSA for N2 purification from air 1 bed, 4 step CO2 sequestration from CO2 -N2 1bed,3stepand6 step air separation 5 bed, 11 step for H2 purification from H2 , CH4 , CO, CO2, NH2 O2 production from air; three pos- sible equalization configurations H2 purification from H2, C4, CO, CO2 2 bed, 4 step PSA, H2 purification from H2 and CH4 103PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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