基于CFD仿真的烟气脱硝装置喷氨咀优化设计  

Optimal Design for the Ammonia Injectors in the SCR-DeNOx System Based on CFD Simulations

作　　者：张硕[1] 许媛媛[1] 金强 李雨 袁景淇[1] 

机构地区：[1]上海交通大学自动化系,上海200240 [2]上海石川岛电站工程公司,上海201108

出　　处：《控制工程》2012年第S1期191-193,共3页Control Engineering of China

基　　金：国家863高技术课题(2009AA04Z162);国家自然科学基金(60974068)

摘　　要：选择性催化还原脱硝工艺的关键控制指标是烟气进入脱硝反应器催化层之前的氨浓度均匀分布和烟气速度均匀分布。以计算流体力学仿真为工具,针对与氨均匀分布控制密切相关的氨喷咀结构进行了优化设计。首先研究了单一喷咀的情况下,计算出在喷氨咀出口加装导流锥对氨浓度分布的影响,并确定导流锥的优化结构。在此基础上研究了导流锥在与实际过程一致的多喷咀系统中对氨浓度混合程度的影响。仿真结果表明,在多喷咀出口加装导流锥可以明显改善氨浓度混合程度,提高SCR脱硝装置的脱硝效率和降低氨逃逸率。There are two key control indexes for the Selective Catalytic Reduction DeNOx process,i.e.the uniform distribution of NH3 concentration and that of the flue gas velocity before entering the catalyst layer.In this article,three dimensional CFD simulations are carried out for optimizing the structure of the injectors on the ammonia inject grids,focusing on the improvement of the NH3 concentration. Firstly,the optimal design is given for single ammonia injector with the tape guider.Then according to the single injector optimal design,the tape guiders are set up on the multi - injectors grid of the actual geometric configuration.The CFD simulation results show that the tape guider could yield more uniformity distribution of NH3 concentration.The optimal design could improve the DeNOx efficiency and decrease the NH3 escape ratio.

关 键 词：选择性催化还原 烟气脱硝 喷氨格栅 导流锥 计算流体力学 

分 类 号：X773[环境科学与工程—环境工程]