Abstract:

Membranes are promising candidates for the separation of carbon dioxide from the flue gas of fossil fuel power plants. The stability of the membrane systems directly restraints its extensive application. This study analyzes the characteristics of membranes，such as pore diameter distribution and porosity，which could affect separation efficiency and stability of the system. Under real conditions，after long-term exposure in flue gas，the impurities could change the performance of membranes. The reduction of gas flux was mainly caused by the deposition of ash particles and gypsum. Water vapor could condense on the surface of membranes or in the pores of membranes through capillary condensation. The presence of sulfur dioxide would decrease the carbon dioxide captured by membranes in the process of competitive adsorption，which resulted in a change of gas flux. All these factors would negatively impact the performance of membranes and affect the application of membrane systems.