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adsorbent layer with longer stage times (b) moderate heat and mass transfer coefficients at moderately long stage times (c) low heat and mass transfer coefficients but with shorter stage times. Although the present parametric study does not attempt to determine the microchannel geometry for the trade-off between convection and diffusion, it accounts for additional effects, including microporous diffusion and adsorption, to analyze the overall adsorption stage performance. This parametric study focuses on the ability to achieve separation while maintaining a sharp adsorption and thermal wavefront by using the considered geometry within controllable and short stage times. For the adsorption stage with a Dh of 530 μm, heat and mass transfer Pe values are 8193 and 8243, respectively. This clearly indicates that fluid flow in the microchannel considered in the present work is inertia-dominated and marginal changes in the heat and mass transfer resistances, as a result of change in diameter, do not affect the overall adsorption stage performance in terms of purity and product collection. For a diameter of 530 μm, it takes no more than 0.3 s for the adsorbent layer to saturate as seen in Figure 2.7(a). The adsorbed concentration curves during desorption provide more insight into the effectiveness of adsorption swing with the present concept. As shown in Figure 2.7(b), for the smallest Dh of 150 μm, the velocity of hot water during desorption is small, resulting in a slower heating of the adsorbent layer and a slower CO2 removal. The CO2 removal rate is very small; hence, the hot water supply should be continued for a reasonable swing capacity of the adsorbent layer. This results in an increased cycle time and energy requirement. For a Dh of 530 μm, the mass flow rate of hot water through the microchannel is the highest between the cases considered; hence, the adsorbed concentration of CO2 rises quickly to the maximum CO2 concentration during adsorption 44PDF Image | TEMPERATURE SWING ADSORPTION PROCESSES FOR GAS SEPARATION
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