湿式钙法烟气脱硫数学模型的建立  

Mathematical model of SO_2 absorption in limestone-based flue gas desulfurization

作　　者：刘盛余[1] 刘沛[1] 高瑾[1] 刘建英[1] 叶芝祥[1] 徐成华[1] 

机构地区：[1]成都信息工程学院资源环境学院,四川成都610225

出　　处：《煤炭学报》2009年第7期961-965,共5页Journal of China Coal Society

基　　金：四川省科技厅公益基金资助项目(2007SGY032);成都信息工程学院发展基金资助项目(KYTZ200701)

摘　　要：在分析石灰石浆液吸收SO2化学反应过程的基础上,根据SO2,CO32-及其水解成分在不同pH值下的组成图,得到了在实际烟气脱硫过程中液膜中只发生2个反应,即SO2+HCO3-←→HSO3-+CO2,SO2+SO32-+H2O←→2HSO3-.并在此基础上根据双膜理论把液膜分成2个反应区,建立了石灰石浆液吸收SO2的物理化学模型.根据Fick第二扩散定律,分别建立了各个反应区的数学模型,确立了模型参数的求解方法.通过求解该吸收模型可以得到各反应区中各组分的浓度分布以及气液界面上SO2的吸收速率.Based on the analysis of chemical reaction of limestone slurry absorbing SO2 and phase diagrams of SO2 and CO3^2- , It was necessary to consider the pH of the absorbent liquid, pH value of the absorbent solution in the practical FGD process was usually between 5 and 6, and the CO3^2- concentration was extremely low, so two reactions in the liquid film： SO2 ＋ HCO3^-←→HSO3^- ＋ CO2, SO2 ＋ SO3^2- ＋ H2O ←→2HSO3^- took place, and the liquid film was divided into two reaction regions. An absorption model with a reaction plane based on the film model was developed, parameters of the model were determined. The calculation program of model was made by MATLAB software, and the concentration distribution of different ions in the liquid film and the SO2 absorption rate can be calculated.

关 键 词：湿式钙法 烟气脱硫 石灰石 气液固反应 

分 类 号：X701.3[环境科学与工程—环境工程]