SNCR脉动式喷射脱硝数值模拟研究  

Numerical Simulation of Pulsed Jet Denitrification for SNCR

作　　者：薄琳 韩奎华[1] 齐建荟[1] 牛胜利[1] 马传岗 BO Lin;HAN Kuihua;QI Jianhui;NIU Shengli;MA Chuangang(Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment(School of Energy and Power Engineering,Shandong University),Jinan 250061,Shandong Province,China;Shandong Leiden Energy Technology Co.,Ltd.,Jinan 250101,Shandong Province,China)

机构地区：[1]高效节能及储能技术与装备山东省工程实验室(山东大学能源与动力工程学院),山东省济南市250061 [2]山东莱顿能源技术有限公司,山东省济南市250101

出　　处：《中国电机工程学报》2023年第7期2771-2780,共10页Proceedings of the CSEE

基　　金：山东大学青年学者未来计划人才项目(31380089964175)。

摘　　要：选择性非催化还原(selective non-catalytic reduction,SNCR)脱硝技术,在无需催化剂的条件下直接将还原剂氨或尿素喷入烟气往往效率不是很高,还原剂与烟气的混合是制约脱硝效率的关键因素之一。以某90t/h层燃炉二次燃烧室为研究对象,运用Fluent软件对炉膛内的烟气流动、传热传质、脱硝反应进行数值模拟,并在不改变氨氮摩尔比和喷枪布置位点的情况下对还原剂喷射方式进行了优化研究。研究结果表明:当还原剂采用脉动速度喷射方式、喷枪角度水平向下45°时可以得到最好的脱硝效果,氨的均匀性指数为0.549,脱硝效率达到58.13%。研究结果为SNCR脱硝技术的优化提供了理论依据和技术参考。With the selective non-catalytic reduction denitrification technology,the reducing agent ammonia or urea is directly sprayed into the flue gas without a catalyst,and the efficiency is often not very high.The mixing of the reducing agent and the flue gas is one of the key factors restricting the denitrification efficiency.Taking the secondary combustion chamber of a 90t/h layer burner as the research object,the Fluent software is used to numerically simulate the flue gas flow,heat and mass transfer,and denitrification reaction in the furnace.The reductant injection method is optimized without changing the ammonia-nitrogen molar ratio and the spray gun placement position.The research results show that the best denitrification effect can be obtained when the reducing agent adopts the pulsating velocity injection method and the spray gun angle is downward 45°.The uniformity index of ammonia is 0.549,and the denitrification efficiency reaches 58.13%.This research provides a theoretical basis and technical reference for the optimization of SNCR technology.

关 键 词：选择性催化还原 数值模拟 脉动喷雾 优化设计 

分 类 号：TM62[电气工程—电力系统及自动化]