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CoB CnB CoB = 0.5 =0=0=1 Heavy Co-current depress- reflux (HR) urization (CoD) Feed (F) = 0 CnB CoB 3.2 Methodology Counter-current depressurization = 0 (CnD) Light reflux (LR) = 0.5 Counter-current depressurization = 0 (CnD) = 0 CnB Figure 3.2: Realization of different operating steps by varying control variables then we realize a co-current depressurization (CoD) step and a light reflux (LR) step, or if we set α = 0, β = 0 and φ = 1 then we get an adsorption step (F) and a counter-current depressurization (CnD) step. 111 (t) (t)f(t) 000 f tswitch t (t) = f (t) = 0 Light reflux (LR) tswitch t (t) = 0 (t) = f (t) = 0 tswitch t CoB CnB CoB CnB Feed pressu- Counter-current rization (FP) depressurization (CnD) (t) = 1 Feed (F) Figure 3.3: Realization of 4-step Skarstrom cycle from the superstructure As a consequence, temporal profiles of α(t), β(t), φ(t), Pads(t) and Pdes(t) result in a se- quence of operating steps. By translating these temporal profiles into a sequence of meaningful operating steps, we eventually obtain a complete PSA cycle. For instance, the profiles of α(t), Chapter 3. PSA Superstructure 39PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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