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Appl. Sci. 2020, 10, 4692 14 of 19 the valve between the two beds is opened, which makes the pressure of Bed1 decrease because the product gas moves from the high pressure bed to the low pressure bed without inlet flows. Then, the mole fraction of the DPE step is shifted up and becomes higher than the mole fraction in the AD step, because the inlet valve is closed and the remaining CO2 in the adsorption bed is adsorbed without input. In the BL step, the pressure in Bed1 drops to the desorption pressure and the adsorbed CO2 is removed from the adsorbent. According to the Langmuir isotherm, CO2 comes out when the pressure drops, which in turn affects the mole fraction of CH4, leading to the lowest value among all six steps. In the PU step, due to the injection of a higher mole fraction of CH4 flowing through the bed from the counter-current direction, the remaining adsorbed CO2 is removed, and the mole fraction of CH4 becomes higher than that in the BL step. In the PPE step, the discharged gas from another adsorption bed comes in at the top of the bed. It has a lower CH4 mole fraction than the PU step, but it does not maintain its value at this step and the CO2 begins re-adsorbing. Therefore, in this step, the mole fraction of CH4 is almost higher than the PU step along the adsorption bed length. Figure 12 shows the results of the CO2 mole fraction in direction opposition to those of CH4, because we assume that the proportions of biogases include only CH4 and CO2. Figure 11. The mole fraction of CH4 at the cyclic steady state with Aspen Adsorption. Figure 12. The mole fraction of CO2 at the cyclic steady state with Aspen Adsorption.PDF Image | Biogas Six-Step Pressure Swing Adsorption
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