关键词: CO₂, 膜吸收, 细颗粒物, 共存气态组分

Abstract: Separation of CO₂ from wet-process desulfurized flue gas by membrane absorption has been the subject of many studies, but investigations on the membrane process are usually carried out under laboratory conditions using pure single gases or binary gas.Under real conditions, wet-process desulfurized flue gas contains impurities, such as fine particles, H₂O and gaseous pollutant, which will influence membrane performance.In this paper, a hollow fiber membrane contactor was put into operation in the wet-process desulfurized flue gas and the effects of fine particles, water vapor and SO₂ on the performance and integrity of the membrane were investigated.The results show that fine particles deposited on the membrane surface reduce CO₂ absorption efficiency, and the stability of membranes can be improved significantly by decreasing the concentration of fine particles in the flue gas.The competitive adsorption of SO₂ is not obvious since its content is much lower than that of CO₂.It will be helpful to eliminate the water vapor by drying with back blowing gas after some period of time, so that the membrane module can work with a good stability.

Key words: carbon dioxide, membrane absorption, fine particle, coexistent gaseous components