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fed by opening valve 6, 12, 18 and 24 respectively. The light product was drawn from each bed by opening valve 1, 7, 13 and 19 and sent to the light product tank (LP Tank). The PSA cycle studied in this study is a 3-bed 7-step process, so only bed 1, 2 and 3 were used and bed-4 was kept isolated by closing all the valves connected to it. Seven exposed tip, K-type thermocouples were placed axially along the column to measure the temperature profiles. Bed 2, 3 and 4 has only three thermocouple across the bed. The temperature profiles provided an estimate of position of the concentration wave fronts within the column. A pressure transducer was placed few inches above each column to measure the column pressure. The solenoid valves were operated using a spreadsheet based LabVIEW software and different process parameters were recorded in the computer using the same software. 3.3 PSA EXPERIMENTS The PSA cycle consist of seven different cycle steps namely feed (F), heavy reflux (HR), pressure equalization (E), counter-current blowdown, light reflux purge (LR), and light product pressurization (LPP). The cycle schedule studied is shown in Table 3.2 and a simple schematic diagram is shown in Figure 3.3. Simulated flue gas containing 15% CO2 in N2 was produced by blending pure CO2 and N2 using flow controller F23 and F22 respectively. Each flowmeter was calibrated using a gilibrator for every gas. Details of each of these cycle steps are given below: The first step of the PSA cycle is the feed step (F) where simulated flue gas (16% CO2 and 84% N2) enters bed-1 at high pressure PH through the heavy end or the feed end of the bed by opening valve 6. The heavy gas, CO2 is preferentially adsorbed whereas N2 15PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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