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2190 Rafael M. Siqueira et al. / Energy Procedia 114 (2017) 2182 – 2192 After the fixed-bed model validation and observation of the time necessary for CO2 to break through the column, the next step was to run the PSA cycles as described in the previous section. As mentioned before, nitrogen and carbon dioxide were dosed to the PSA unit in a composition ratio similar to typical values for flue gases (i.e. 85% of N2 and 15% of CO2). With a pressurization time of 58 seconds in average, the PSA process was performed in 33 cycles, reaching the cyclic stationary stage (CSS) around the 25th. The pressure profile inside the adsorption bed of the first two cycles and the simulated pressure data are displayed in Fig. 6, showing good agreement between each other. Gas phase samples were collected in the end of the adsorption step at different moments along the PSA cycles, so that the composition could be analyzed. According to the obtained results, the achieved N2 purity and productivity were then evaluated as shown in Fig. 7. Fig. 6. History of the pressure of the two first cycles at the column outlet during the CO2 separation process by PSA. Again, comparison between experimental and simulation data assures the reliability of the model. According to the results for the tested process configuration and step program, a purity of about 98% and productivity of 15 mol h-1 kg-ads-1 are reached at cyclic steady state. Fig. 7. History of the N2 purity during the CO2 separation process by PSA. Symbols for experimental data and continuous line for simulation.PDF Image | Carbon Dioxide Capture by Pressure Swing Adsorption
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