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Chapter 4. Explicit/Multi-Parametric MPC Control of PSA Systems 250 200 150 100 50 0 0 0.2 0.4 0.6 0.8 1 Z/L PE − II PE − I Adsorption Repressurization Depressurization − I Depressurization − II Depressurization − III Purge Blowdown Figure 4.5: Hydrogen axial concentration profiles at CSS at end of each PSA process step Purity = Recovery = 0 [ z=L,BED1 tcodep1 z=L,BED2 CiUAbed ] (4.20) dt ads ads ∫∫ CH2 UAbed dt tt CH2 UAbed dt − Ncomp t t ads ads ∑∫∫ i=1 CiUAbed dt − 0 z=L,BED1 tcodep1 z=L,BED2 ads ads ∫∫ tt CH2 UAbed z=L,BED2 dt 0 z=L,BED1 tcodep1 (4.21) CH2 UAbed dt − CH2 UAbed dt t ∫ ads 0 Figure 4.5 and 4.6 shows the axial concentration profiles of H2 and CH4 at the end of each of the nine process steps, once CSS is achieved. CH4 profiles in particular, demonstrate how the impurity level inside the col- 76 z=0,BED1 3 Hydrogen Conc., mol/mPDF Image | Operation and Control of Pressure Swing Adsorption Systems
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