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针对MEA(乙醇胺溶液)降膜吸收CO_2的过程中存在的传热传质问题,本研究建立了不同浓度MEA溶液降膜吸收CO_2的二维数学模型,得到了液膜内部温度场与浓度场分布,以及液膜内热通量、质量通量和CO_2吸收速率沿液膜下降方向的变化规律。结果表明:界面处温度在入口处迅速上升,随后呈指数规律下降;相界面处的热通量、质量通量、液膜流膜下降方向上CO_2吸收速率在入口处直线下降,随后小幅变化,说明吸收作用主要发生在入口段附近。在液膜中间位置处,热通量和质量通量的变化趋势在入口段附近差异很大,这可能是由反应放出的热量一部分被液体吸收所致。
Aiming at the problem of heat and mass transfer in the process of COA falling into the membrane of MEA (ethanolamine solution), a two-dimensional mathematical model of CO 2 absorption in different concentrations of MEA solution was established and the distribution of temperature field and concentration field , And the change law of the heat flux, mass flux and CO 2 absorption rate in liquid film along the drop direction of liquid film. The results show that the temperature at the interface rapidly increases at the entrance and then decreases exponentially. The heat flux, mass flux and CO 2 absorption rate at the interface decrease linearly at the entrance and then change slightly, Note absorption occurs mainly in the vicinity of the entrance section. At the middle of the liquid film, the trend of heat flux and mass flux varies greatly near the inlet section, which is probably caused by the liquid absorbing some of the heat released by the reaction.