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the microchannel. For this parametric study, 25 kPa and 10 kPa are chosen as the lower pressure drop values. Table 3.2 shows the revised values of all the stage times for the three pressure drop cases considered. As the pressure drop decreases, it takes longer for CO2 to saturate the adsorbent during adsorption. Additionally, it takes longer to remove the CO2 from the adsorbent layer with the resulting slower liquid flows. Cooling stage time is also affected accordingly; however, the extended purge stage time remains unaffected. This is because the removal of liquid water from the adsorbent layer is governed by diffusion of evaporated water through the porous layer and not by convection through the microchannel. It can be seen from Table 3.2 that the total cycle time increases by only 15% even though the pressure drop is reduced by 90% as a result of a constant purge stage time, which constitutes up to 96% of the total cycle time for the baseline case. Table 3.2. Effect of reduction in ΔP on purification cycle time. Stage times [s] Adsorption Displacement of gas Desorption Cooling Displacement of liquid Purge Complete cycle ΔP = 100 kPa 0.19 0.52 4.00 3.00 0.70 195.00 203.41 ΔP = 25 kPa 0.35 0.90 15.00 8.00 2.65 195.00 221.90 ΔP = 10 kPa 0.50 1.30 20.00 10.00 6.60 195.00 233.40 For a constant baseline temperature swing of 175°C, the sensible heat and heat of desorption remain unchanged, because equal adsorbent layer saturation and operating capacity is ensured when the adsorption and desorption stage times are calculated. The 85PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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