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T. Esaki et al. 3.2. Transport Phenomena in Adsorber The adsorption under elevated pressure obtained by the analysis model, the washing, and the phenomena in the tower caused by the decompression attach- ment and removal process were considered. The driving conditions in each process are listed in Table 4. The pressure was boosted and 111.3 kPa were sup- plied to the gas washing process after adsorption under elevated pressure was provided by the decompression and desorption process. Therefore, the partial CO2 pressure caused by the decompression attachment and removal process was equal to that of the washing process, and the flow rate was determined for the introduced gas differential-pressure at the tower entrance. The CO2 pressure change and pick-up rate of 0.01 - 0.99 for each process at the Ainai location are presented in Figure 5 and Figure 6. The time of 0 s was set for the decompres- sion attachment and removal processes to complete 10 kPa. The dependence of CO2 on the tower inflow by the adsorption in the elevated pressure process was higher than that in the analysis result, and the pressure increased. Subsequently, the pick-up rate reached the adhesion balance in 10 s at the tower entrance, and the CO2 that was not absorbed performed advection at the lower part of the tower. From this point, there was almost no CO2 inflow pressure and adhesion at the lower part of the tower (0.8 - 1.0) at 150 s during the adsorption at the end of the elevated pressure process, and it was found that CO2 outflow to the exterior of the tower had not occurred. In the washing process, the pressure exhibited large fluctuations in the early stage under the influence of adhesion. At the end of the washing process, the adhesion advanced to the central part of the tower at 0.5 in 200 s. The pressure rapidly decreased in the decompression attachment and removal process, and the attachment and removal progressed. The pick-up rate also provided a good indication for the progress of the attachment and re- moval process. However, during the decompression attachment and removal process, the absorbed amount increased at the lower part of the tower. The rea- sons for this are as follows: CO2 gas was introduced by the adsorption under elevated pressure; advection from the washing process occurred at the lower part of the tower; CO2 adhered to the lower part of the tower. Thus, the CO2 migra- tion phenomena induced by each process are elucidated. The aging changes for the N2 density in the adsorption tower are shown in Figure 7. The adsorption under elevated pressure shows that the N2 density in- creased over time at the adsorption tower entrance by the introduction of pres- surized gas. Moreover, it was found that, during the washing process, the N2 density at the exit, which is the lower part of the tower, was higher than that at the entrance. The N2 that entered the tower with the introduction of CO2 is a washing gas that spreads the advection throughout the lower part of the tower and then flows out through the tower exit. The N2 amount that remains in the tower after the washing process is sufficiently smaller compared with the N2 amount that remains after the process of adsorption under elevated pressure. Therefore, the N2 amount left by the process of decompression attachment and removal is small, and CO2 gas with high purity can be collected. DOI: 10.4236/msce.2021.93004 47 Journal of Materials Science and Chemical EngineeringPDF Image | Analysis of CO2 Pressure Swing Adsorption
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