摘要
为获得废液焚烧炉选择性非催化还原(Selective Non⁃Catalytic Reduction,SNCR)脱硝较优的工艺参数,以四面墙错冲布置的脱硝喷枪为研究对象,运用计算流体力学(Computational Fluid Dynamics,CFD)模拟的方法分析了氨水的粒径及喷射速度对SNCR脱硝性能的影响规律。结果表明,粒径为200μm既满足所有液滴均在反应区蒸发完全以及获得较大的中心区(氨氮摩尔比大于1的区域),又能保证水蒸气与烟气混合均匀。液滴粒径为300μm时,通过改变液滴的喷射速度对蒸发完全的粒子数目影响较小,但将喷射流速保持在20~25 m/s时可获得较大的中心区面积且利于NOx的脱除。将脱硝喷枪的喷射角度向下倾斜能显著促进液滴的蒸发,形成更大的中心区,并使水蒸气与高温烟气混合更加均匀,从而获得更好的脱硝效果。
In order to obtain the better process parameters of selective non⁃catalytic reduction(SNCR)denitrification of the waste liquid incinerator,the denitrification spray guns arranged staggered on four walls are used as the research object,and the influence of the particle size and injection speed of ammonia water on the denitrification performance of SNCR is analyzed by the method of computational fluid dynamics(CFD)simulation.The results show that the particle size of 200μm not only satisfies the requirement that all droplets evaporate completely in the reaction zone and obtain a larger central area(a region where the ammonia⁃nitrogen molar ratio is greater than 1),but also can ensure the uniform mixing of water vapor and flue gas.When the droplet size is 300μm,changing the jet velocity of the droplet has little effect on the number of fully evaporated particles.However,when the injection speed is maintained at 20~25 m/s,a larger central area can be obtained and it is beneficial to the removal of NOx.Tilting the spray angle of the denitration spray gun down could significantly promote the evaporation of droplets,form a larger central area,and make the water vapor and high⁃temperature flue gas mix more evenly,thereby obtaining a better denitration effect.
作者
祝鑫阳
罗俊伟
ZHU Xinyang;LUO Junwei(Wuhan Wuguo Energy Engineering Co.,Ltd.,Wuhan 420223,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《山东电力技术》
2021年第6期50-55,共6页
Shandong Electric Power
基金
国家重点研发计划项目(2018YFB0605300)。
关键词
SNCR脱硝
粒径
喷射速度
喷射角度
蒸发
混合
SNCR denitrification
particle size
injection speed
spray angle
evaporation
mixing
