膜科学与技术

膜法海水吸收烟气中二氧化碳的试验研究

作者：李晓明，郭春刚，刘国昌，张召才，关毅鹏，陈颖

单位：国家海洋局天津海水淡化与综合利用研究所，天津 300192

关键词：聚丙烯中空纤维膜接触器；CO2脱除率；海水吸收剂；传质速率

出版年,卷(期):页码： 2012,32(1):93-97

摘要：

采用自制聚丙烯中空纤维膜接触器，以海水作为吸收剂，对模拟烟气中CO2进行吸收试验研究。主要考察烟气流量、CO2浓度、海水流量、海水pH值及膜填充率对CO2脱除率及膜接触器传质性能的影响。研究结果表明：（1）提高烟气流量或CO2浓度能提高膜接触器对CO2的处理量，导致脱碳率下降；（2）提高海水流量能明显提高脱碳率和传质速率；（3）提高海水pH可增大海水对CO2的吸收能力，直接决定了海水对CO2的吸收机制；（4）增大膜接触器填充率所对应的脱碳率并非最高，有效气液接触面积是影响脱碳率和过程传质的重要因素。

Polypropylene hollow fiber membrane contactors were used for CO2 removal from simulated flue gas with seawater as absorbent. The effects of gas flowrate, CO2 concentration, seawater flowrate, seawater pH and membrane contactor packing fraction on CO2 removal efficiency were investigated. The results showed that increasing flue gas flowrate and CO2 concentration improved CO2 handling capacity for membrane contactor and reduced the CO2 removal efficiency. Increasing seawater flowrate or seawater pH could evidently improve CO2 removal and mass transfer rate, so that directly determined the mechanism for seawater absorbing CO2. Simply increasing packing fraction of membrane contactor could not improve CO2 removal efficiently. Making gas-liquid contact area effective and stable in the membrane contactor was important for promoting membrane gas absorption process.

李晓明(1980- ),女,辽宁朝阳人,硕士研究生,工程师,从事膜材料制备及应用研究.〈lixiaoming0618@yahoo.com.cn〉

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