摘要
以大同第二发电厂亚临界机组锅炉为背景,以满足环保指标、降低NO_x排放要求为目的,提出了亚临界机组锅炉的低氮燃烧器改造方案。采用超浓缩煤粉燃烧与燃尽风摆动的立体错列分级低氮燃烧技术,超浓缩均流给粉旋流煤粉燃烧器延长了煤粉在还原性气氛中的停留时间,摆动燃尽风燃烧器设计使主燃区还原性气氛增强,进一步降低烟气中NO_x的排放量,同时达到了抑制NO_x生成和强化煤粉着火、燃尽的目的。该优化改造项目将煤粉燃烧器改造为新型旋流耐磨陶瓷煤粉燃烧器,燃烧器数量、旋转方向与原燃烧器相同。点火油枪及火检插入位置、方式不变。将燃尽风燃烧器全部改造为上下摆动燃烧器,燃尽风采用大风箱风道布置方式,原有燃尽风箱、风道上移部分利旧改造使用。燃尽风量不变,燃尽风燃烧器装置采用内直外旋上下摆动结构。对改造前后的锅炉试验数据进行比较,证明了优化改造后锅炉的NO_x有了大幅度的降低。这表明燃烧器改造后提高了亚临界锅炉的燃烧效率,能够满足环保指标及NO_x排放要求,可以达到节能减排的目的。
As the background of Datong Second Power Plant subcritical boiler,to satisfy the reducing nitrogen oxides emission,the optimization of boiler burner for subcritical generation unit is showed. The low nitrogen combustion technology including concentrating coal combustion and swing over fire air,to extend the residence time,to enhance the reduction,further reduce emissions of NOx in flue gas,at the same time,the inhibition of NOx production and strengthen the purpose of pulverized coal ignition and burnout. The optimization project transformed the pulverized coal burner into a new type,the number same as the original burner. The same ignition oil gun fire detection,and insert position. The over fire air burner retrofitted for swing burner,using the big air duct and the old. The over fire air constant devised by direct external rotation on the swing structure. Compared with the experimental data before and after the transformation,it is proved that the nitrogen oxides in the boiler are greatly reduced. It shows that the combustion efficiency of the subcritical boiler is improved after the burner is reformed,which can meet the requirement of environmental protection and nitrogen oxide emission.
出处
《电力科技与环保》
2017年第3期48-51,共4页
Electric Power Technology and Environmental Protection
关键词
亚临界
燃烧器
NOx
改造
subcritical generation unit
boiler burner
nitrogen oxides emission
optimization
作者简介
李晓敏（1983-），女，汉族，山西大同人，硕士研究生，山西大同大学煤炭工程学院从事科研与教学工作。E—mail：wangli-jun19811222@163．com
