摘要
在膜接触器实验装置上,研究了一乙醇胺(MEA)溶液捕集混合气中CO2的操作性能,考察了气液流速、吸收剂和混合气的浓度等因素对出口气相CO2摩尔分数y(CO2)和总传质系数的影响,采用正交实验方法优化操作条件,确定最佳操作方案.结果表明:y(CO2)随液速增大而减小,随气速增大而增大;总传质系数随流速增大而增大,气速的增大对总传质系数影响不明显;吸收剂浓度增大,混合气CO2浓度增大,总传质系数增大;正交试验得出最佳操作条件为液速70mL.min-1、气速0.6L.min-1、MEA浓度2.0mo.lL-1和y(CO2)为10%,此时总传质系数为2.86×10-4m.s-1.
Performance of CO2 capture from a gas mixture by means of aqueous monoethylamine （MEA） is studied on an experimental device of membrane contactor. Effects of gas and liquid flowrates, absorbent concentration and gas CO2 contents on outlet gas-phased CO2 concentration and overall mass transfer coefficient are investigated. An optimal operation condition is determined by orthogonal design. Results show that, outlet gas-phased CO2 concentrations decrease with the increase of liquid flowrates but increase with the increase of gas flowrates ; overall mass transfer coefficients increase with the increase of liquid flowrates but effects of gas flowrates on overall mass transfer coefficient are inconspicuous. Overall mass transfer coefficients increase with the increase of absorbent concentrations and gas CO2 contents. The optimum operation condition obtained by the orthogonal design is liquid flowrate at 70 mL·min^-1, gas flowrate at 0. 6 L·min^-1 ,with MEA concentration of 2. 0 mol·L^-1 and CO2 content of 10%. Herein,the overall mass transfer coefficient is 2. 86 × 10^-4 m·s^-1.
出处
《南京信息工程大学学报（自然科学版）》
CAS
2009年第3期243-246,共4页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
关键词
膜接触器
CO2
MEA
操作优化
membrane contactor
CO2
monoethylamine
operation optimization
