关键词: 二氧化碳, 膜吸收, 中空纤维膜接触器, 烟气

Abstract: Polyvinylidine fluoride (PVDF) hollow fiber membrane contactors were applied to the separation of carbon dioxide (CO2) from flue gas using water (H2O), sodium hydroxide (NaOH), potassium glycine (GLY) and potassium glycine-piperazine (GLY-PZ) solution as dedicated absorption liquid. Effects of flow mode, flow rate of feed gas and absorbent solution, absorbent concentration and temperature, feed gas concentration and packing density on the removal rate and total mass transfer coefficient were investigated in detail. Results showed that the lumen side process with two phases flowing countercurrently had the highest separation efficiency. The absorption performances of four kinds of absorbents were in the sequence of NaOH> GLY-PZ> GLY> H2O. The effect of temperature on various absorbent was different. The separation efficiency of CO2 can be enhanced by increasing of the packing density, concentration and flow rate of absorbent solutions while weakened with increasing of the concentration and flow rate of flue gas.

Key words: carbon dioxide, membrane absorption, hollow fiber membrane contactor, flue gas