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

本研究采用中空纤维膜接触器对火电厂烟气中CO_2进行化学吸收。实验结果表明，随着操作温度的升高，CO_2吸收速率增大，吸收剂用量减少，吸收剂循环所需的能量和再生热负荷降低。当充入中空纤维管侧的富吸收液穿过膜壁向相反的处于减压下的壳侧渗透时，CO_2从吸收剂中释放出来，并在一定压力水平以下形成气泡。当气泡形成时，剥离速率提高。CO_2汽提速率随孔径的减小而增大。

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.