中文摘要：

采用聚丙烯中空纤维膜接触器,分别用去离子水、单乙醇胺（MEA）及N-甲基二乙醇胺（MDEA）水溶液作为吸收剂,对模拟烟气中的CO2分离进行了试验研究.考察了气体流速、入口气体中CO2体积分数、吸收剂流速、吸收剂浓度以及吸收剂种类等因素对CO2脱除率和总传质速率的影响.实验结果显示：3种吸收剂分离CO2的效率由大到小依次为MEA、MDEA、去离子水;CO2的脱除率和传质通量随吸收剂浓度、流速的提高均增加;CO2的脱除率随气体流速和CO2在入口气体中体积分数的增大而减小,而传质速率却随之增加.系统长时间运行后发现存在膜孔润湿现象,进而影响膜的传质性能.因此,吸收剂浓度须在传质和长时间运行性能之间进行权衡.

英文摘要：

Carbon dioxide absorption from flue gases was experimentally investigated using deionized water and amine solvents including monoethanolamine （MEA） and methyldiethanolamine （MDEA） in polypropylene （PP） hollow fiber membrane contactor. The dependency of CO2 removal efficiency and the mass transfer rate on operating parameters were studied, such as the mixed gas flow rate, the volume concentration of CO2 at the gas feed inlet, liquid flow rate, concentration of absorbents as well as solvent types. It was found that the efficient of MEA was higher than MDEA and that of deionized water was the lowest ; the CO2 removal efficiency and mass transfer rate increased with the increase of the liquid flow rate and the solvent concentration ; the CO2 removal efficiency decreasesd with the increase of the gas flow rate and CO2 volume fraction in the feed gas, while the CO2 mass transfer rate increasesd. It was observed that in experiments a long operation period could lead to partial membrane wetting even when using relatively low solvent concentrations, resulting in a significant decrease of membrane absorption performance. Therefore, the absorbent concentration should be compromised between the absorption efficiency and the membrane wetting to ensure a stable and efficient removal of CO2 with a long life of the hollow fiber membrane.