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412 P. BISWAS et al., Modeling and Simulation for Pressure Swing Adsorption System ..., Chem. Biochem. Eng. Q. 24 (4) 409–414 (2010) Fig. 3 – Flow sheet of 8 stage PSA system for single bed The equations were solved in a sequential manner for each stage. The output of each stage was retained and used later when connecting step required data for input stream. For example, efflu- ent flow data of stage 2 is the input stream of stage 7 (Fig. 3). Also, the conditions (adsorbed amount, temperature etc.) of the bed at the end of the stage are the initial conditions for the succeeding step. Results The model was simulated for many cycles until steady state, which was attained after about 200 cycles for both types of bed packing. The variation of concentration of gas com- ponents (N2, CO, and CO2) after the feed step along the bed in the steady state are shown in Figs. 4–6. It can be observed that the amount ad- sorbed is almost the same for activated carbon and zeolite packing. Similar is the case for carbon mon- oxide. F i g . 4 – Concentration of N2 in the gas phase along the bed at the end of feed step F i g . 5 – Concentration of CO in the gas phase along the bed at the end of feed stepPDF Image | Modeling and Simulation for Pressure Swing Adsorption System
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