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Rafael M. Siqueira et al. / Energy Procedia 114 (2017) 2182 – 2192 2187 Table. 2. Parameters used in all simulation processes Parameter Axial heat dispersion Global heat transfer Schmidt Number Reynolds Number Correlation L 7 0.5 Sc Re kg U 1 1/hw dint /kw ln dext /dint dint /dext 1/hext Sc g g Dm Re gudp g The performance of a PSA process is commonly evaluated through the product purity, product recovery and productivity. Those three parameters can be calculated according to Eqs. 6-8 [31–33]. The system was equipped with a gas analyzer (GC) equipped with a thermal conductivity detector at the exit of the column. The samples of the gas mixture leaving the column were collected and stored automatically into the analyzer, for posterior analysis. N Purity 2 tAD FN ,out dt AD 0 2 tAD F dt tAD F dt N2 Recovery tAD F N ,out AD02 02 tAD FN ,out dt tPG FN ,in dt AD 0 2 PG 0 2 N ,in AD 0 2 dt tPR F dt NProd. AD 0 2 PG 0 2 PR 0 2 CO ,out (6) (7) tAD FN ,out dt tPG FN ,out dt tPR FN ,in dt N ,in PR 0 2 mass of dry adsorbent t where AD, BD, PR, PG are the steps of the PSA process as previously described. In this case, the productivity of nitrogen is determined in mol kg-1 h-1. 3. Results 3.1. Adsorption isotherms Adsorption equilibrium isotherm data for pure component CO2 and N2 at 298, 323 and 348 K are shown in Fig. 2 and the isotherm for the mixture CO2 + N2 (15/85 %) at 298 K is presented in Fig. 3. The parameters of the Langmuir model fitted to the experiments are exhibited in Table 3. As one can observe, the Extended Langmuir model was able to satisfactorily predict the behavior of the mixture adsorbing by using the parameters obtained from the fitting for each component. The activated carbon sample presented a higher capacity for carbon dioxide in comparison to nitrogen, as expected, since CO2 critical temperature (304.45 K) is significantly higher than that of N2 (126.19 K), which makes CO2 behave more like a condensable vapor and not as a supercritical gas as occurs with N2. The isosteric heat of adsorption is a necessary input parameter for the energy balance, evaluated from the isotherms by applying the Clausius-Clapeyron equation [22]. The obtained heats of adsorption for CO2 and N2 as functions of the amount adsorbed are shown in Figure 4. The variation of the heats of adsorption were neglected and an average value of 26 kJ mol-1 was used for CO2 and 15 kJ mol-1 for N2. 2 cycle (8)PDF Image | Carbon Dioxide Capture by Pressure Swing Adsorption
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