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Energies 2021, 14, 3582 (a) (b) Figure 5. Adsorption isotherm of (a) CO2 and (b) N2 on EIKME 13X zeolite. Table 4. Extended Langmuir–Freundlich isotherm parameters of CO2 and N2 on zeolite 13X. Table 4. Extended Langmuir–Freundlich isotherm parameters of CO2 and N2 on zeolite 13X. 8 of 15 Components CO2 CO 6.5072 −3 −36×.51007 N2 N 3 1.185 ×2 10 −31 −1.012852×110 Components ai,1 (mol/kg) ai,a2 (m(oml/oKl/·kg) i,1 a (mol/K·kg) ib,2i,0 (1/atm) −3 −3 −1 −4 bi,1 (K) 1.722 × 103 − 6.215 × 102 1.182 b (K) i,1 mi,1 (-) mi,1 (-) 6.013 × 10 1 mi,2 (K) mi,2 (K) 12 −2.4 × 10 1 −1.2 × 10 2 −3 × 10 8 × 10 −1.022 × 10 4.842 × 10 8 × 10−3 1.722 × 10 4.842 × 10−4 6.215 × 10 b (1/atm) i,0 3 2 6.013 × 10−1 1.182 −2.4 × 10 −1.2 × 10 3.2. Breakthrough and Desorption Curve Verification 3.2. Breakthrough and Desorption Curve Verification To verify the reliability of the LDF coefficient, kLDF, and simulation program, the To verify the reliability of the LDF coefficient, kLDF, and simulation program, the breakthrough curve and desorption curve experiments were performed. The operating breakthrough curve and desorption curve experiments were performed. The operating conditions are presented in Table 5, and the results are shown in Figure 6. These results conditions are presented in Table 5, and the results are shown in Figure 6. These results show that our simulation data are close to the experimental data. Therefore, the accuracy show that our simulation data are close to the experimental data. Therefore, the accuracy of the mass transfer coefficient was verified. of the mass transfer coefficient was verified. (a) (b) Figure 6. Simulation of (a) breakthrough curve and (b) desorption curve. Figure 6. Simulation of (a) breakthrough curve and (b) desorption curve. Table 5. Operating parameters of the breakthrough and desorption curves. Feed composition Bed length (m) Bed diameter (m) Bed volume (L) Feed pressure (atm) Feed temperature (K) Surrounding temperature (K) Feed flow rate (m3/s) Breakthrough Curve Experiment 15.0 vol% CO2 1 2.32 × 10−2 0.42 2.5 298 298 1.67 × 10−5 Desorption Curve Experiment Pure He 1 2.32 × 10−2 0.42 2.5 298 298 1.00 × 10−5 3.3. Three-Bed Nine-Step PSA Process Verification In this section, the average experimental data of the last 40 cycles of the onsite 100-h three-bed nine-step PSA process experiment at a power plant are used for the simulation verification. The cyclic-steady-state feed concentration of CO2 is 15.36 vol% and the concentration of N2 is 84.64 vol%, the feed flow rate, feed pressure, vacuum pressure, vent pressure, surrounding temperature, and feed temperature are 9.703 × 10−4 m3/s, 3 atm, 0.07 atm, 0.25 atm, 303.14 K, and 303.14 K, respectively. The experimental and simulation results are presented in Table 6, and the simulation results are close to the experimental results. Based on Figure 7, the temperature and pressure profiles of both the simulation and experiment follow the same trend, confirming the accuracy of the simulation program.PDF Image | CO2 captured from flue gas using the PSA process
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