Operation and Control of Pressure Swing Adsorption Systems

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Operation and Control of Pressure Swing Adsorption Systems ( operation-and-control-pressure-swing-adsorption-systems )

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4.13 Two dimensional projection of the 22 critical region (CR) polyhe- dral, corresponding to the 8th order reduced SS model (Eq. 4.22 to 4.25),[x2 =0,x2 =0,...,x7 =0,u=85,y=0,yr =0],N=4, M=2andR=30 .......................... 90 4.14 Online implementation of the explicit/multi-parametric controller forPSA ................................ 91 4.15 Comparison of reduced models with different tswitching, against two PSA controller performance indicators for the step disturbance case study.................................. 93 4.16 Closed loop performance comparison of mp-MPC and PID con- trollers for the 10% step and 35 % impulse disturbance scenarios . 96 4.17 Closed loop comparison of mp-MPC and two different PID con- trollers for the 54 % impulse disturbance scenario . . . . . . . . . 97 5.1 Two-bed, 6-step, multi-valve PSA configuration employed for this study. FEED: production step; DEP: co-current depressurization; BLDN: counter-current depressurization or blowdown; PURGE: counter-current purge with product; PE: co-current pressure equal- ization; REPRES: co-current re-pressurization with feed . . . . . . 108 5.2 A framework for simultaneous design, operational and control op- timizationunderuncertainty..................... 120 5.3 Axial distribution of gas phase methane concentration at CSS . . 126 5.4 AxialdistributionofQCH4 atCSS.................. 127 5.5 Time evolution of pressure swing and the associated temperature swingoveraPSAcycleattheoptimalconditions . . . . . . . . . 128 16

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