Abstract: CO₂ absorption by aqueous alkanolamine solution is an important research topic in the field of biogas purification. A packed tower was used to investigate the CO₂ absorption by ethanolamine (MEA) solutions. The effective gas-liquid interfacial area was calculated from the experimental results of CO₂ absorption by sodium hydroxide aqueous solutions. A mathematical model was proposed to calculate the enhancement factor of the CO₂ absorption of relatively high concentration by MEA aqueous solutions. The influence of various technological parameters on the enhancement factor of CO₂ absorption by MEA was analyzed from the two aspects of mathematical model and experiment, including gas flow rate, MEA concentration and CO₂ concentration. The results show that the model predictions are in good agreement with the experimental values. The enhancement factor of CO₂ absorption by MEA increases with the increment of MEA concentration and decreases with the increment of CO₂ concentration and gas flow rate.

Key words: biogas purification, packed tower, ethanolamine, absorption, carbon dioxide, model, enhancement factor

摘要： 醇胺溶液吸收CO₂是沼气提纯领域重要的研究课题。在实验填料吸收塔中，以NaOH水溶液吸收低浓度CO₂的实验结果估算了填料的有效相界面积，建立了乙醇胺（MEA）溶液吸收高浓度CO₂增强因子的数学模型，并从数学模型和实验的角度研究了MEA浓度、进气流率、CO₂浓度等工艺参数对MEA吸收CO₂增强因子的影响。结果表明，增强因子数学模型计算值与实验值能够良好吻合，MEA吸收CO₂化学反应增强因子随进气CO₂浓度增加而降低，随MEA浓度增加而增加，随进气流率增加而减小。

关键词: 沼气提纯, 填料塔, 乙醇胺, 吸收, 二氧化碳, 模型, 增强因子