| dc.description.abstract | The effects of human-caused global warming are getting serious year by year, and will worsen as long as humans generate more greenhouse gases, especially carbon dioxide, to the atmosphere. If we can reduce carbon dioxide emission, we may avoid some of the worst effects.
Currently, there are various technologies for capturing carbon dioxide. Due to the advantages of low energy consumption, low capital investment and highly operating capability, the pressure swing adsorption (PSA) technology was chosen in this study. The adsorptive tubular membrane fabricated by Desiccant Technology Co., Ltd. (DTECH) will be used as the adsorbent material for separating capturing carbon dioxide (15% v/v) and nitrogen, simulating the flue gas from coal-fired power station.
In this study, Thermo Cahn D-200 Digital Recording Balance is used to measure the isotherm behaviors of pure carbon dioxide and nitrogen gases. The equilibrium selectivity was calculated from isothermal data to consider the separating performance of DTC tubular membrane. The Langmuir-Freundlich isotherm model was used to fit the experimental data of the isotherm and to obtain the parameters.
Subsequently, the breakthrough experiments were conducted by using the tubular-membrane-filled bed to measure the fully saturated adsorption capacity of the adsorbent bed under different flow rates at constant pressure and room temperature with the feeding composition of 15% CO2 and 85% N2.
Finally, the single-bed four-step PSA experiment was processed and serial designed experiments by Taguchi method and design of experiments will be tested and analyzed. The major impact factors of adsorption and desorption time, feed flow rate and co-current depressurization from the data analyzed from PSA experiments are determined and the regression model are investigated.
The optimal operating conditions are 270 s adsorption and desorption time, 3.98 L/min feed flow rates and 0.3 bar co-current depressurization pressure with CO2 product purity 84.06% and recovery 65.98%. | en_US |