Co_2 Separation By Pressure Swing Adsorption Process Based On Sorbents Derived From Fly Ashes

摘要

The paper presents the results of carbon dioxide separation applying pressure swing adsorption process asthe one of post-combustion CO_2 capture method. Sorbents synthesized from fly ashes coming from Polishpower plants and the commercial equivalent to the sorbents were used in this method. The separation iscarried out in the two-bed pressure swing adsorption (PSA) laboratory installation, whose beds were filledwith granulated sorbents being under research. A variety of parameters which affect separation processsuch as pressure, adsorption time and configuration (pressure equalization, cocurrent and countercurrentdepressurization) were taken into account. The feed gas was a simulated mixture of flue gas coming fromoxygen-enriched combustion containing CO_2, O_2 and N_2. The adsorption process was carried out underlow feed gas pressure to minimize energy demand for gas pressurization. The effectiveness of the processfor applied sorbents was determined by average concentration of CO_2 in low-pressure product andrecovery of CO_2 from feed gas.