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CHAPTER 4 RESULTS AND DISCUSSION 4.1 PSA EXPERIMENTAL RESULTS A number of PSA experiments were performed in the 4-bed PSA experimental setup to study the effect of different process parameters on the performance of the PSA process. Total twenty runs were carried out to study the effect of various process parameters on the performance of the PSA process. The parameters studied include feed concentration, reflux or purge to feed ratio (γ) in the light reflux step, CnD pressure (PL) or the pressure ratio (π) by keeping the high pressure constant (PH) and bed temperature. Table 3.3 summarizes all the process conditions for the run E-1 through E-20. The base case is run 2 (E-2) which was conducted at 70 °C bed temperature, total cycle time was 720 sec, reflux ratio 3% and CnD pressure 5 kPa. The CnD pressure (PL) was controlled by fine-tuning with a needle valve in the vacuum line. The mass balance of all the runs along with the percentage of error was summarized in Table 4.1. The experimental error in all the runs were no more than 4%, which is reasonably accurate. Figure 4.1 shows the periodic state temperature profiles of three beds during experiment E-1. Only bed-1 is equipped with seven thermocouples (T-1 to T-7) along the bed. Bed 2 and 3 has only three thermocouple placed along the bed at a relative distance of 24.20% (bottom), 47.26% (middle) and 70.31% (top). Figure 4.1 (a-c) shows the periodic state temperature profile of all three beds for the top, middle and bottom thermocouples. Since all the beds undergoes same cycle steps in a sequential manner, the temperature 20PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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