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T. Esaki et al. creases. The pressure fluctuation caused by the change in the adsorption and desorption is large because it becomes a batch wise process later in the modal PSA. Additionally, the momentum of the CO2 gas depends on the phenomena of adsorption and desorption, and disappears and appears accordingly. Therefore, it is assumed to influence the adsorption and desorption. In this study, a non-regular simultaneous equation that considers the mass, energy, and mo- mentum was established, and an analysis model was developed. To establish each equation, the required physical properties were obtained from the litera- ture, while unclear values were obtained by experiment. We confirmed that the verification of analysis model by comparing to the ex- perimental CO2 breakthrough result. The beginning time of breakthrough to the adsorber and CO2 concentration at outlet adsorber time variation was evaluated in the experiment and calculation. The calculation result obtained by the analy- sis model was larger than the experimental result for the adsorption tower ob- tained in the bench scale experiment; therefore, the consistency of the model was confirmed. The CO2 in the tower and the temperature and flow distribution were considered by the numerical value more than the calculation result. Additional- ly, the phenomena inside the PSA adsorption tower were elucidated and the PSA driving was estimated. 2. Transport Phenomena in Adsorber 2.1. Pressure Swing Adsorption Step Figure 1 and Table 1 present the process of the PSA method considered in this study. The exhaust including CO2 circulates gas inside the adsorption tower during the adsorption in the elevated pressure process from an art process, and CO2 adheres to the adhesion pill. After the adhesion balance, the fluid is changed and the process shifts to the washing process. The purge process converts im- purities into a dense fog and supplies CO2 gas to the adsorption tower. The sup- plied CO2 has a high degree of purity, owing to the washing process, and re- mains in the tower where it is decompressed during the decompression attach- ment and removal process. Finally, CO2 with high attached or removed purity is collected. The adsorption in the elevated pressure, washing, and decompression attachment and removal processes assumes that the driving is successively switched over for one of the adsorption towers in the PSA method. The phenomena in the adsorption tower caused by each process occurring in the tower are considered. The adsorption tower specifications were established by an analysis model as presented in Table 2. The equipment shape of the ad- sorption tower imitates the ASCOA-3 adsorption tower of JFE Engineering Corp. Considering the corrosive nature of the dense fog, and the condensation by which the gas inflowing into the CO2 adsorption tower is SOx and NOx, we assume that gaseous H2O is removed. The adhesion pill uses ZEORAM F-9 ob- tained from Sumitomo Seika Chemicals Co., Ltd., which is a NaX-type zeolite and can be uniformly filled into the adsorption tower. DOI: 10.4236/msce.2021.93004 41 Journal of Materials Science and Chemical EngineeringPDF Image | Analysis of CO2 Pressure Swing Adsorption
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