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5.3 Case Studies and Computational Results H2 (t) = 1 Adsorption at feed pressure with heavy reflux (Step 1) H2 (t) = 0 Heavy reflux at high pressure H2 (t) as profile (t) = 0 (t) = 0.72 (t) = 0 (t) = 1 CoB (t) = 1 Feed (t) as profile Feed Feed pressu- rization with adsorption (Step 3) CO2 Desorption (Step 8) CnB CoB CnB CoB CnB 0 ≤ tnormalized ≤ 0.01 (Step 2) 0.01 ≤ tnormalized ≤ 0.16 0.16 ≤ tnormalized ≤ 0.76 (t) = 1 (t) = 1 Pressure equalization Light reflux (Step 6) Counter-current depress- urization (Step 7) (t) = 1 (t) = 1 CoB CnB CoB CnB (t) = 0.86 Feed Feed pressu- rization with heavy reflux (Step 4) (t) = 0 0.76 ≤ tnormalized ≤ 0.8 Light reflux at vacuum (Step 9) (Step 5) (Step 10) 0.8 ≤ tnormalized ≤ 1 Figure 5.6: Optimal VSA configuration for case II that Pa = Pdes. This leads to an energy-saving pressure equalization step for both beds (step 5 and step 10). Although α(t) is 1, not much flow is observed from CnB to CoB during this step. Thus, this reflux is shown as a dotted connection in Figure 5.6. Further, the co-current bed follows the steps of the counter-current bed and vice-versa. This completes the cycle. The optimal VSA cycle obtained in this case incorporates conventional operating steps, and in a conventional order. Figure 5.6 together with the gas-phase CO2 concentration profiles in Figure 5.7 illustrate several key aspects of the cycle. First we observe that in this cycle heavy reflux is not used as a major step to enrich adsorbed-phase CO2 concentration towards Chapter 5. Superstructure Case Study: Pre-combustion CO2 Capture 88PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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