钠碱脱硫体系气液吸收过程的数学模型研究  

Mathematic Model of Absorbing SO_2 in Flue Gas by Sodium Alkali Solution

作　　者：王伟之[1,2] 张锦瑞[1] 杨春光[3] 张书廷[4] 

机构地区：[1]河北联合大学矿业工程学院,河北唐山063009 [2]河北省矿业开发与安全技术实验室,河北唐山063009 [3]宣化钢铁集团有限责任公司,河北宣化075100 [4]天津大学环境科学与工程学院,天津300072

出　　处：《高校化学工程学报》2011年第6期941-947,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：日本国家基金项目(NEDO0706001)

摘　　要：针对钠碱烟气脱硫体系中气液吸收过程中复杂的反应及传质特性,基于双膜传质理论,建立了填料塔内钠碱脱硫中气液反应的数学模型。模型中全面考虑了所有反应的可逆反应、气相阻力对传质的作用及各组分的扩散。根据工艺研究中的实验条件对模型赋初值,结合模型参数估值确定适宜的边界条件后,采用MATLAB对模型方程进行求解,得到了液膜内各组分的浓度分布曲线,以及气相分压、pH值、传质阻力、传质速率、吸收增强因子等沿塔高的分布特性。结果表明模型预测结果和实验结果吻合良好。所建立的模型为该工艺过程和其它湿法烟气脱硫过程的传质-反应现象提供了一个定量的理论分析和工程设计基础。Based on the two-film mass transfer theory,a model for absorbing SO2 in flue gas by sodium alkali solution in packed column was proposed,which includes diffusion and reaction processes.In the model,all reversible reactions,the effect of gas phase resistance on the mass transfer and the diffusion of various components are taken into account.The equations in the model could be solved by using MATLAB with boundary conditions obtained by rational estimation of the parameters involved.Then the model was used to calculate the concentration profiles in the liquid film,partial pressure,mass transfer rate,pH profiles,enhancement factor and gas film resistances along the column,respectively.The calculated results were compared to experimental data and a good agreement was achieved.The study provides a basis for theoretical analysis and engineering design of the process of adsorbing SO2 in flue gas by sodium alkali solution and other wet FGD process.

关 键 词：烟气脱硫 钠碱 填料塔 数学模型 

分 类 号：X701.3[环境科学与工程—环境工程] TQ018[化学工程]