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的CO_2进行了化学吸附研究。实验结果表明，CO_2吸收率随操作温度的升高而增加，从而降低了吸收剂用量，从而降低了吸收剂循环所需的功率和吸收剂再生的热负荷。用无机多孔中空纤维膜对富吸收液中CO_2进行了脱除实验。当注入中空纤维管侧的富吸收液穿过膜壁，向减压的相反壳侧渗透时，在一定压力水平下，CO_2从吸收剂中释放出来并形成气泡。气泡形成后，汽提率提高。结果还表明，随着孔隙尺寸的减小，CO_2溶出率增大。

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.