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When the adsorption tower reached the adhesion balance, the exit density reached the entrance density. To confirm the consistency of the analysis model, the breakthrough time of the CO2 gas was estimated. The ratio of CO2 break- through calculated the density of the CO2 gas concentration at the exit as 1.0, which is equivalent to the CO2 gas concentration at the entrance. The changes of the exit CO2 density in the experimental and analysis results are shown in Figure 2. The CO2 was mixed into the supply gas at 0 s. The adhesion of CO2 progressed throughout the experiment, and breakthrough began at 830 s. It was found thatthe ratio of CO2 breakthrough of 90% was reached in 1000 s. The break- through began at 810 s according to the calculation result obtained by the analy- sis model, and the ratio of CO2 breakthrough exceeded 90% at 900 s. The CO2 density changes in the adsorption tower and the aging of the absorbed amount are shown in Figure 3 and Figure 4. The CO2 and time course flow in the ad- sorption tower were higher compared with the analysis result. Additionally, it was found that the wear moved forward. The adhesion balance was mostly reached in the bed, as indicated by the time when the CO2breakthrough began. Therefore, the actual phenomenon was accurately expressed by the analysis model. Table 3. List of coefficients in calculation. Langmuir Constance A Value 0.29 × 10−3 0.265 1.39×10−5 3.4 × 10−10 996.6 0.18 1.13 1940 684 0.566 Reference experiment experiment M.F.Edwards(1968) Hirano, S. (2008) experiment experiment experiment experiment experiment experiment T. Esaki et al. Symbol Equilibrium adsorption amount q∞ PackedbedinCO diffusionofcoefficient D 2 CO2 Pores in diffusion coefficient Dads Adsorption heat ΔHads Effective thermal conductivity of packed bed keff Specific adsorbent heat CpAds Density of adsorbent ρAds Density of adsorbent packed bed ρbeds Porosity of adsorbent packed beds ε Table 4. Conditions for adsorption breakthrough test and PSA cycle operation. Breakthrough PSA cycle step Gas flow rate Operation total pressure CO2patricidal pressure Duration [Nm3/h] [kPa] [kPa] [s] Adsorption 100 478.9 200.0 134.3 22.62 22.62 1400 150 Rinse - Desorption −35.63 101.3 10 91.17 9.12 50 100 DOI: 10.4236/msce.2021.93004 45 Journal of Materials Science and Chemical EngineeringPDF Image | Analysis of CO2 Pressure Swing Adsorption
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