Carbon dioxide chemical absorption into 2-amino-2-methyl-1-propanol (AMP) aqueous solution and mass transfer enhancement in cascade sudden expansion microchannels were investigated by a high-speed digital camera. The influences of the flow rates of gas and liquid phases, the sudden expansion units and the concentration of AMP on the gas-liquid two-phase flow and mass transfer performance are studied systematically. Results showed that the increase of sudden expansion unit is conductive to increase liquid side volumetric mass transfer coefficient and enhancement factor. The maximal enhancement factor could reach to 1.33, and the maximally effective mass transfer efficiency could reach 1.6 under taking the energy consumption into account. The gas phase flow rate has slight effect on mass transfer enhancement factor E, while E decreases with increasing liquid phase flow rate. With the increase of AMP concentration, the volumetric mass transfer coefficient increases, but the enhancement factor decreases. A new correlation with good prediction performance was proposed for the volumetric mass transfer coefficient. Furthermore, the energy consumption and effective mass transfer efficiency were assessed.

通过高速数码相机研究了 2-氨基-2-甲基-1-丙醇 (AMP) 水溶液中的二氧化碳化学吸收和级联突然膨胀微通道中的传质增强。系统研究了气液两相流量、急膨胀单元和AMP浓度对气液两相流动和传质性能的影响。结果表明，突然膨胀单元的增加有利于提高液侧体积传质系数和增强因子。在考虑能耗的情况下，最大增强因子可达1.33，最大有效传质效率可达1.6。气相流速对传质增强因子E的影响很小, 而E随着液相流速的增加而减小。随着AMP浓度的增加，体积传质系数增加，但增强因子减小。为体积传质系数提出了具有良好预测性能的新相关性。此外，还评估了能耗和有效传质效率。