Design and Operation of Pressure Swing Adsorption Processes

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Design and Operation of Pressure Swing Adsorption Processes ( design-and-operation-pressure-swing-adsorption-processes )

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Table 6.3: Isotherm parameters for H2 and CH4 on activated carbon [108] α1 α2 β1 β2 Methane 0.0086 -0.2155 0.0004066 -0.010604 Hydrogen -0.0000379 -0.01815 2.2998 -0.05993 Table 6.4: Molar flux variables for each operating step 6.5 Case Study - Hydrogen PSA Feed flux = Fj(t) = (feed)j available area Purge flux = Pgj(t) = (purge)j available area Heavy product flux = Hpj(t) = (heavy product)j available area Outlet flux = Oj(t) = depressurization Fj(t)=0 Oj(t) = 0 􏱱 Hpj(t) = −uPyj 􏱱􏱱 Pgj(t)=0 (outlet)j available area desorption Fj(t)=0 Oj(t) = 0 􏱱 j = CH4, H2 pressurization adsorption uPy 􏱱􏱱 Fj(t)= j 􏱱 uPy 􏱱􏱱 j 􏱱 RT x=0 Oj(t) = 0 Fj(t)= Oj(t) = Hpj(t) = 0 Pgj(t)=0 Hpj(t) = 0 Pgj(t)=0 RT x=0 Hpj(t) = −uPyj 􏱱􏱱 RT x=0 RT x=0 uPy 􏱱􏱱 j 􏱱 RT x=L Pgj(t)=− uPy 􏱱􏱱 j 􏱱 RT x=L Table 6.5: Boundary conditions for each operating step pressurization yj|x=0 =yf,j adsorption yj|x=0 =yf,j depressurization desorption ∂y 􏱱􏱱 j􏱱 ∂x􏱱x=0 ∂yj 􏱱􏱱 =0 =0 ∂y 􏱱􏱱 j􏱱 =0 􏱱 ∂yj 􏱱􏱱 ∂x x=L =0 􏱱 ∂yj 􏱱􏱱 ∂x x=L =0 ∂x x=L P|x=0 = Plow ∂x x=0 yj|x=L =yj|x=L of other bed P|x=0 = Phigh T|x=0 =Tfeed P|x=0 = Phigh T|x=0 =Tfeed ∂T􏱱􏱱􏱱 ∂x 􏱱x=0 ∂ T 􏱱􏱱 ∂x x=L =0 = 0 P|x=0 = Plow ∂T􏱱􏱱􏱱 =0 􏱱 ∂ T 􏱱􏱱 􏱱 ∂ T 􏱱􏱱 ∂x 􏱱x=0 ∂ T 􏱱􏱱 = 0 = 0 u|x=0 = ufeed = 0 u|x=0 = ufeed ∂x x=L u|x=L = 0 ∂x x=L u|x=L = 0.125ufeed u|x=0 = −ureg u|x=L = 0 ∂x x=L u|x=0 = −ureg u|x=L = −0.6ureg Chapter 6. Reduced-order Modeling for Optimization 116

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