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Chapter 3. Mathematical Modeling of PSA Systems properties instead of the exact value of each system variable. ∫1 0 xpavg = xp(z∗)dz∗; z∗ = z/L (3.15) (3.16) eCSS max(t) = xpavg(t) − xpavg(t − tcycletime) ≤ ε • Method 4 - PSA performance indicators measurement An extension of above mentioned Method 3 is to measure just the most im- portant variables related to the PSA system - performance indicators. As already mentioned in Chapter 1 of this thesis, the three key performance indicators of PSA operation are product recovery, product purity and ad- sorbent productivity, mathematically defined in Eq. 3.17, 3.18, and 3.19, respectively. Recoveryi = t∫ f eed Ci U Abed dt (3.17) (3.18) Purityi= ∑ ∫ Ncomp tfeed i=1 0 z=L P roductivityi = t ∫ t ∫ Ci U Abed dt z=L f eed 0 0 t ∫ 0 z=0 Ci U Abed f eed t ∫ f eed dt dt Ci U Abed dt f eed Ci U Abed z=L 0 z=L τcycletimeMadsorbent Ci U Abed dt =0 z=L (3.19) τcycletimeLAbed(1 − εb)ρp It should be noted that the above definitions of performance indicators are 57PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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