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Light Product (LP) Ca,i(t), Ta(t), (t) va(t), Pads(t) Top reflux (TR) 3.2 Methodology Co-current Bed (CoB) Inlet gas Pa(t) Input flux (F) Feed compressor Heavy-product compressor Bottom reflux (BR) (t) Cd,i(t), Td(t), vd(t), Pdes(t) Vacuum Generator Patm Heavy Product (HP) Pressure-reducing Valve P (t) d P Pfeed inlet Inlet (t) compressor Feed (optional) Figure 3.1: A 2-bed PSA Superstructure be included in the cycle. With development of optimization strategies for process synthesis, it is natural to consider a superstructure based approach to design PSA processes. As discussed in the next section, this approach relies on the formulation of an optimal control problem. 3.2 Methodology 3.2.1 Superstructure Figure 3.1 illustrates the proposed 2-bed PSA superstructure. It has a co-current bed (CoB) and a counter-current bed (CnB) that determine co-current and counter-current operating steps in the cycle, respectively. We consider only two beds to ensure that the direction of the flow, and thus the superficial velocity, remains co-current for CoB and counter-current for CnB. This strategy avoids flow reversals in the bed, and does not require additional bed connections with embedded logical conditions in order to realize different operating steps. This Chapter 3. PSA Superstructure 37 Counter- current Bed (CnB)PDF Image | Design and Operation of Pressure Swing Adsorption Processes
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