Absorption of Sulfur Dioxide with Sodium Hydroxide Solution in Spray Columns

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• 作者：Zhanke Wang ; Yu Peng ; Xiaocong Ren ; Shaoyong Gui ; Guangxu Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：September 9, 2015
• 年：2015
• 卷：54
• 期：35
• 页码：8670-8677
• 全文大小：379K
• ISSN：1520-5045

文摘

The absorption of sulfur dioxide into highly concentrated sodium hydroxide in a spray column from simulated flue gas was investigated. The influences of different operating conditions on the SO₂ removal efficiency, such as sodium hydroxide concentration, liquid-to-gas ratio, gas velocity and SO₂ concentration, were examined. The overall volume transfer coefficients (k_Ga), under moderate conditions, were obtained by introducing the instantaneous and irreversible chemical reaction into the two-film theory to establish a model that allowed the calculation of theoretical values of the overall volume-transfer coefficient. It was found that the absorption process was controlled by diffusion through gas film when a highly concentrated caustic soda solution was adopted. The overall volume-transfer coefficient was essentially independent of concentration of SO₂ in gas phase and positively related to the gas and liquid flow rates. The formula of k_Ga was fitted for the process and found to be in good agreement with experimental results.