水泥窑SCR烟气脱硝反应器内流场均匀性研究  

Uniformity of flow field in SCR denitrification reactor of cement kiln

作　　者：许肖飞 郭旸旸 高虹[1] 王雪[2] 朱廷钰[2] Xiaofei XU;Yangyang GUO;Hong GAO;Xue WANG;Tingyu ZHU(School of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;National Engineering Lab of Hydrometallury Cleaner Production Technology,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,内蒙古呼和浩特010051 [2]中国科学院过程工程研究所湿法冶金与清洁生产技术国家工程实验室,北京100190

出　　处：《过程工程学报》2021年第12期1440-1450,共11页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51778600)。

摘　　要：采用Fluent软件对选择性催化还原(SCR)脱硝反应器内流场进行模拟,基于标准k-ε模型、多孔介质模型、物质输运模型、DPM模型,采用单一气相烟气分析了不同整流格栅间距、整流格栅高度、整流格栅位置及导流板个数、导流板角度对烟气流场均匀性的影响,最终对最优方案下单一气相不同组分的烟气、不同负荷进行了验证,以及DPM双相耦合条件下不同负荷进行了验证。结果表明,从无整流格栅到加整流格栅时,最大入射角均小于90°,催化剂上方涡流消失;当整流格栅的间距为107 mm,整流格栅高度为200 mm,整流位置与入口下边缘平齐时首层催化剂上层100 mm处的速度分布偏差系数降至19%;当导流板的个数为7个,导流板角度为18.2°时最为合适,此时首层催化剂上方100 mm处的速度分布偏差系数为11.91%,最大入射角度为3.14°。当最佳参数下对单一气相不同组分的烟气、不同负荷进行模拟,均符合工程要求。采用DPM双相耦合,颗粒物采用Rosin-Rammler分布条件下与单一气相进行对比发现,首层催化剂上方100 mm处平均速度有了一定的增加,速度标准差变化较小,速度分布偏差系数相应减小,符合工程要求。Fluent software was used to simulate the flow field in the selective catalytic reduction(SCR) denitrification reactor, based on the standard k-ε model,porous media model, material transport model, DPM model. A single gas phase flue gas was used to analyze the effects of different rectifying grids spacing,rectifying grid height, rectifying grid position and baffle number, baffle angle onthe uniformity of the flue gas flow field. The influence of the smoke with different components in a single gas phase under the optimal scheme can be concluded. The gas verified under different loads, as well as different loads under DPM dual-phase coupling conditions. The results showed that the maximum incident angle was less than 90° from the absence of the rectification grid to the addition of the rectification grid, and the vortex above the catalyst disappeared. When the spacing of the rectifying grid was 107 mm, the height of the rectifying grid was 200 mm, and the rectifying position was flushed with the lower edge of the entrance, the velocity distribution deviation coefficient at 100 mm of the upper layer of the first catalyst layer reduced to 19%. When the number of baffles was 7, and the baffle angle was 18.2°, the most suitable situation, the velocity distribution deviation coefficient at 100 mm above the first layer of catalyst was 11.91%, and the maximum incident angle was 3.14°. When the flue gas with different components in a single gas phase and different loads were simulated under the best parameters, it met with the engineering requirements. Using DPM two-phase coupling, comparing the particles with a single gas phase under the Rosin-Rammler distribution condition, it was found that the average velocity at 100 mm above the first layer of catalyst increased to a certain extent, the velocity standard deviation had a small change, and the velocity distribution deviation coefficient was correspondingly reduced.

关 键 词：选择性催化还原法 导流板 整流格栅 多孔介质模型 数值模拟 

分 类 号：X781.5[环境科学与工程—环境工程]