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T. Esaki et al. The gas velocity and temperature in the adsorber are expressed as follows: ∂u(zk+1 ) ∂T (zk+1 ) ∂z =0, ∂z =0 (10) b) Desorption step. The gas density and concentration in the adsorber are expressed as follows: The amount of CO2 adsorption on the surface of the adsorbent particle is ex- pressed as follows: q(z,r )=f (ρ,z,P) (13) i k Ads,l+1 qi i k i 4) Center of adsorbent particle. The amount of CO2 adsorption at the center of the adsorbent is expressed as follows: ∂qi (zk,rAds,0)=0 (14) ∂rAds Subjunctive conditions. • The effect of gravity is ignored. • The interaction of each component in the adsorbent pore is ignored. • Two-component system (CO2-N2). • The density, heat capacity, and viscosity of each component are constant values. • The momentum change is not affected by the adsorbent. The coefficient for each transport phenomenon considered in the analysis model was obtained from previous studies [5] [6] [7]. The amount of the equili- brium CO2 adsorption, adsorption heat, heat capacity, adsorbent density, and thermal conductivity of the adsorbent packed beds were experimentally deter- mined. The coefficient values obtained from the numerical analysis are summa- rized in Table 3. 3. Analysis Results and Discussion 3.1. Consistency of Experimental and Simulation Results The consistency of the experimental result obtained for the adsorption tower of ASCOA-3 was investigated with consideration to the developed analysis model described in the previous section. The analysis conditions are listed in Table 4. The actual gas exhausted by a steel process was introduced through an experi- ment, and the CO2 density of the gas exiting the adsorption tower was measured. p(z )= P , k +1 back = 0 (11) The gas velocity and temperature in the adsorber are expressed as follows: ∂yi (zk+1) ∂z ∂T (zk +1 ) u(zk+1)=−u(zk ), ∂z =0 (12) 3) Surface of adsorbent particle. DOI: 10.4236/msce.2021.93004 44 Journal of Materials Science and Chemical EngineeringPDF Image | Analysis of CO2 Pressure Swing Adsorption
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