| dc.description.abstract | Carbon capture and storage is an important method for global commitment to tackle climate change, and here pressure swing adsorption process (PSA) is used to capture carbon dioxide from flue gas in a thermal power plan. Pressure swing adsorption (PSA) is a cyclic process to separate gas mixtures based on the difference of adsorption capacity of each component on adsorbent. This study aims to capture carbon dioxide from flue gas of coal-fired power plant by PSA process for bottom product CO2 purity 95 % and recovery 90 %.
In order to obtain the correction factor (f_(q_m )) to modify the parameters of the extended Langmuir-Freundlich isotherm adsorption model, The equilibrium adsorption capacity of carbon dioxide and nitrogen on zeolite 13X was measured by the adsorbent regeneration method at Taichung coal-fired Power Plant. Then, the simulation is verified with experiments of 1-bed 3-step PSA process.
Next, the 3-bed 9-step PSA process is used with adsorption, cocurrent depressurization, vacuum, and twice pressure equalization to sperate flue gas (12.69 % CO2, 87.31 % N2) after desulphurization and water removal of Taichung coal-fired power plant.
Finally, in order to find the optimal operating conditions, this study combined the simulation of 3-bed 9-step PSA process with design of experiments (DOE) method. After simulation analysis, the bottom product CO2 purity is 96.16 % with 91.28 % recovery while at feed pressure 3.85 atm, vacuum pressure 0.05 atm, cocurrent depressurization 0.2 atm, bed length 60 cm, step 1/4/7 time 400 s, step 2/5/8 time 209 s, and step 3/6/9 time 120 s as the optimal results. The mechanical energy consumption was estimated to be 1.11 GJ/t-CO2. | en_US |