基于中空纤维膜接触器的混合胺吸收剂脱除烟气中CO2

Removal of CO2 from flue gas by mixed absorbent based on hollow fiber membrane contactor

在聚丙烯(PP)中空纤维膜接触器试验平台上,利用MDEA-PG、MDEA-PZ和MDEA-MEA三种混合胺吸收剂对模拟烟气进行脱碳处理,结果表明,三种混合胺吸收剂的CO2膜吸收性能高低依次为:MDEA-MEA>MDEA-PG>MDEA-PZ。相比质量浓度为35%,混合胺吸收剂在质量浓度为20%时的CO2吸收性能增速更为显著,混合胺吸收液的合理质量浓度范围为20%~35%;同一浓度下,MDEA-MEA、MDEA-PG和MDEA-PZ在溶质配比为1∶0.8时的CO2脱除率最高,依次为45.05%,38.84%和32.95%;MDEA-MEA、MDEA-PG和MDEA-PZ混合胺吸收剂在质量浓度为30%(溶质配比1∶0.8)时最经济可行。

On the PP(polypropylene)hollow fiber membrane contactor test platform,three mixed amine absorbents of MDEA-PG,MDEA-PZ and MDEA-MEA were used to decarburize simulated flue gas.The results showed that:three mixed absorption the order of its CO2 absorption performance was:MDEA-MEA>MDEA-PG>MDEA-PZ.Compared the concentration was 35%,the mixed absorbent with additives added at a concentration of 20%had a more significant increase in CO2 absorption performance.It is recommended that the mixed absorbent reasonable concentration range is 20%~35%;MDEA-MEA,MDEA-PG and MDEA-PZ have the highest CO2 removal rate when the solute ratio was 1∶0.8,which were 45.05%,38.84%and 32.95%respectively;the optimization test showed,MDEA-MEA,MDEA-PG and MDEA-PZ mixed absorbents were the most economical and feasible when the concentration was 30%(solute ratio 1∶0.8).