Study on performance enhancement of CO2 chemical absorption system using porous hollow fiber membrane contactor

采用中空纤维膜接触器对火电厂烟气中二氧化碳的化学吸收进行了研究。实验结果表明，随着操作温度的升高，CO_2的吸收速率增加，所需的吸收液量减少，吸收液循环所需的功率和吸收液再生所需的热负荷降低。当中空纤维管侧进料的富含吸收液穿过膜壁向相反的壳侧减压时，CO_2从吸收剂中释放出来，并在一定压力水平下形成气泡。当气泡形成时，气泡的剥离速率提高。结果还表明，CO_2的剥离速率随着孔径的减小而增大。

This study focused on chemical absorption of CO_2 from flue gas of fire power plants using hollow fiber membrane contactor. The experimental results show that the CO_2 absorption rate increased with increasing operation temperature, which leads to reduction in required absorbent amount and the resultant reduction in power required for circulation of the absorbent and heat duty for absorbent regeneration.An experiment of CO_2 stripping from rich absorbent liquid was also performed by using inorganic porous hollow fiber membranes. When the rich absorbent liquid fed in the tube side of the hollow fiber penetrates through the membrane wall toward the opposite shell side that is under reduced pressure, CO_2 is released from the absorbent with forming bubbles below a certain pressure level. When the bubbles were formed, the stripping rate was enhanced. The results also showed CO_2 stripping rate increased with decreasing the pore size.