乙醇胺水溶液降膜吸收CO_2的数值研究  

Numerical Study of the Falling Film Absorption of Carbon Dioxide by Monoethanolamine Solution

作　　者：赵林林[1] 丁玉栋[1] 朱恂[1] 廖强[1] 

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《热能动力工程》2016年第9期27-32,131,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金项目(No.51276205;51576022);国家自然科学基金重点项目(No.51136007);教育部科学技术研究项目(No.113053A);国家杰出青年科学基金项目(No.51325602);重庆市自然科学基金重点项目(No.cstc2013jj B9004)

摘　　要：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。In the light of the heat and mass transfer problems in the process of the MEA( monoethanolamine) solution to absorb the carbon dioxide in falling films,a two-dimensional mathematical model for the MEA solution at various concentrations absorbing carbon dioxide in falling films was established and the distribution of both temperature and concentration field inside the liquid films as well as the law governing changes of the heat flux,mass flux and carbon dioxide absorption rate inside the liquid films along the liquid film falling direction were obtained. It has been found that the temperature at the inlet on the boundary surface rapidly increases and then assumes a decline as per an exponential regularity. The heat flux,mass flux and carbon dioxide absorption rate along the liquid film falling direction at the inlet drops sharply like a straight line and afterwards,changes by a small margin,indicating that the absorption action mainly happens at places closing to the inlet section. At the middle location of the liquid film,the variation tendency of the heat and mass flux differs greatly around the inlet section,which is possibly caused by a part of the reaction-released heat quantity absorbed by the liquid.

关 键 词：乙醇胺溶液 降膜吸收 二维数值模拟 热通量 质量通量 

分 类 号：X77[环境科学与工程—环境工程]