Design and Operation of Pressure Swing Adsorption Processes

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Design and Operation of Pressure Swing Adsorption Processes ( design-and-operation-pressure-swing-adsorption-processes )

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max H2 recovery (from Equation (6.34)) s.t. ROM Equations (6.36)-(6.41) H2 purity ≥ 0.998 (from Equation (6.32)) 490kPa≤PH ≤510kPa 140kPa≤PL ≤160kPa 4 ≤ tp ≤ 6 49≤ta ≤51 0.09 ≤ ufeed ≤ 0.11 −0.0505 ≤ ureg ≤ −0.0495 (6.44) As a convention, flow is considered negative for the depressurization and desorption steps, and 6.5 Case Study - Hydrogen PSA Figure 6.8: Gas-phase methane mole fraction profiles for ROM for relaxed bounds in Case I are required on decision variables for ROM-based optimization. 6.5.4.2 Case II: Optimization with velocities In this case, besides operating pressures and step times, we also consider feed and regeneration velocities as decision variables and solve the following ROM-based optimization problem which maximizes hydrogen recovery within a trust-region. Chapter 6. Reduced-order Modeling for Optimization 129

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