Dynamic Response and Characteristics of an Oxygen Vacuum Swing Adsorption

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Dynamic Response and Characteristics of an Oxygen Vacuum Swing Adsorption ( dynamic-response-and-characteristics-an-oxygen-vacuum-swing- )

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346 C.C.K. Beh and P.A. Webley/Adsorption Science & Technology Vol. 21 No. 4 2003 NOMENCLATURE Model nomenclature bi, boi Cv di, doi ki m1,2 M ni neiq P Q 1st site dual-site isotherm parameters (1/kPa) valve flow coefficient 2nd site dual-site isotherm parameters (1/kPa) mass-transfer coefficient for oxygen and nitrogen 1st and 2nd dual-site isotherm parameter (mol/kg) adsorbent bed mass (kg) nitrogen and oxygen adsorbed loading (mol/kg) nitrogenandoxygenadsorbedequilibriumloading(mol/kg) pressure (kPa A) volumetric flow rate through valve (m3/s) 1st site dual-site isotherm parameter (J/mol) 2nd site dual-site isotherm parameter (J/mol) universal gas constant [kJ/(mol K)] fluid specific gravity time variable (s) temperature (K) volume (m3) mole fractions of nitrogen and oxygen bed voidage Q1i Q2i R Sg t T V yi b Model subscripts 1 feed tank inlet before control valve (m3/s) 3 feed tank outlet after control valve (m3/s) 3A adsorbent bed 1 inlet (m3/s) 4 product tank inlet after control valve (m3/s) 4A adsorbent bed 1 product (m3/s) 6 product tank inlet after control valve (m3/s) 8A adsorbent bed 1 evacuation (m3/s) 10A adsorbent bed 1 purge (m3/s) A1 adsorbent bed 1 D downstream of valve F feed tank P product tank U upstream of valve FODT nomenclature Kp process gain (%O2/%valve open) O change in product oxygen concentration (%O2) t cycle number T total number of cycles V change in input variable (typically valve position) (%)

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