摘要
为解决燃气机组小孔直喷式喷氨格栅结构引起的烟气和氨气混合不充分问题,研制了基于涡旋发生及输送效应的方型烟氨混合装置,与其他类型烟氨混合装置进行对比,研究了燃气机组中方型烟氨混合装置对流场及氨氮物质的量比分布的影响,结果表明:不加混合器、增加圆盘混合器及增加方型混合器催化剂前截面氨氮物质的量比分布的变异系数(δ_(CV))分别为11.9%、10.8%及8.95%,将方型混合器置于高压蒸发器和催化剂之间,方型混合器与催化剂之间截面的氨氮物质的量之比分布的δ_(CV)值降为1.20%;燃气机组余热锅炉高压蒸发器与催化剂之间设置方型混合器后,方型混合器与催化剂间截面的氨氮物质的量比分布的δ_(CV)值由不加混合器时的14.68%降至3.71%,实现了烟气和氨气充分混合,为SCR催化剂的高效催化反应创造了有利条件。
In order to solve the problem of insufficient mixing of flue gas and ammonia gas caused by the structure of direct injection ammonia grille in gas unit,a square mixing device based on vortex occurrence and conveying effect was developed,and it is also compared with other type mixing devices.The influence of the flow field and molar distribution of ammonia nitrogen is studied.The results show that the coefficient of variation(δ_(CV))of ammonia nitrogen molar ratio distribution without mixer,adding disk mixer and adding square mixer is 11.9%,10.8%and 8.95%respectively.After setting the square mixer between the high-pressure evaporator and the catalyst,theδ_(CV)value of the ammonia nitrogen molar ratio of the cross section between square mixer and catalyst is reduced to 1.20%.After setting the square mixer between the high pressure evaporator and the catalyst of the gas unit,theδ_(CV)value of the ammonia nitrogen molar ratio distribution of the cross section between the square mixer and the catalyst is decreased from 14.68%without the mixer to 3.71%.It is achieved the sufficient mixing of flue gas and ammonia gas,and created preferential conditions for the efficient catalytic reaction of the SCR catalyst.
作者
石磊
SHI Lei(CHN Energy Guangxi Electric Power Co.,Ltd.,Nanning 530007)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第S02期398-405,共8页
Clean Coal Technology
基金
国家重点研发计划资助项目(2017YFB0603900,2017YFB0603904)
关键词
燃气轮机
SCR脱硝
余热锅炉
流线示踪法
变异系数法
混合优化
gas turbine unit
SCR denitrification
heat recovery boiler
flow line tracer method
variability coefficient method
mixing optimization
