选择性催化还原脱硝系统烟道中导流板设计数值模拟  

Design and numerical simulation for flow deflector in the gas flue of selective catalytic reduction denitrification system

作　　者：周志明[1] 樊卫国[1] 董立春[1] 

机构地区：[1]重庆大学化学化工学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2009年第10期1187-1192,共6页Journal of Chongqing University

基　　金：国家科技支撑计划资助项目(2007BAC204B00)

摘　　要：采用Fluent对4种选择性催化还原(SCR,selective catalytic reduction)脱销系统烟道弯曲段导流板设置方案进行了模拟,模拟过程基于标准K-ε湍流模型和2D模型,通过对速度分布图和进出口压力降的分析,探讨了导流板设置对烟道出口速度分布、压差和能量损耗的影响,得出结论:在烟道中设置导流板,可以显著改善流场的分布。而合理的导流板设计不仅能使流速变得均匀,而且还可以降低烟道的能量损失和压降。当导流板设计过大时,虽能更好的改善流场,但因其本身对流体阻力的增大,将导致烟道的能量损失和压降增大。研究结果对SCR脱销系统的研发提供了参考。Four design schemes of flow deflector in the gas flue of selective catalytic reduction （SCR） denitrification system are simulated based on K-ε turbulence model and 2D model by Fluent. By analyzing the speed profile and pressure drop of the import and export, the effects of the flow deflector on the import and export speed profile, pressure drop, and energy dissipation are studied. It can be concluded that flow field distribution could be significantly improved by putting the flow deflector into the gas flue. Reasonable flow deflector design can not only make the flow field distribution uniform but also reduce the pressure drop and the energy dissipation. With the increase of flow deflector dimensions, the flow field distribution will be more uniform. The pressure drop and the energy dissipation will increase because of the increase of resistance caused by flow deflector. The research results are helpful for designing selective catalytic reduction denitrification system.

关 键 词：选择性催化还原 计算流体力学 导流板 数值模拟 

分 类 号：X701.7[环境科学与工程—环境工程]