摘要
热风炉燃烧过程中生成的氮氧化物(NO_(x))为热力型,当拱顶温度超过1420℃时,NO_(x)大量生成。基于浓淡燃烧技术开发的高风温低氮燃烧顶燃式热风炉,其燃烧器设置两层空气煤气交错喷口,其中上层是35%的煤气和15%空气混合燃烧,下层是15%的煤气和35%的空气混合燃烧,利用燃气的浓淡燃烧,避免出现局部高温,从而减少烟气中NO_(x)的生成量。并且,煤气与空气混合更加均匀、燃烧效率更高,在相同空气煤气条件下,可送出更高的风温。某钢厂2000m级高炉热风炉单烧高炉煤气,年平均风温≥1240℃,废气中NO_(x)排放浓度长期≤25mg/m^(3)。
The nitrogen oxides(NO_(x))generated during the combustion operation of hot stoves are thermally generated ones,and they are produced in a large amount when the dome temperature exceeds 1420.For the shaftless hot stove which is developed based on the fuel-rich/lean combustion technology,and feature high blast temperature and low NO_(x)emission,its burners are designed with two layers of staggered air and gas injection nozzles,in which the upper layer works with 35%gas+15%air for combustion,while the lower layer works with 15%gas+35%air.Adoption of this technology can prevent local high temperature,thereby it reducesNO_(x)generation in the off-gas.Additionally,the technology offers more uniform gas and air mixing,higher combustion efficiency,and higher blast temperatures under the same air-gas conditions.In a plant with a blast furnace of 2000m^(3)level,the hot stove is fueled by BFG only,but its annual average blast temperature reaches 1240℃and above with NO_(x)content in the exhaust gas always keeps at≤25 mg/m^(3).
作者
刘成伟
王贤
唐耀
孔博文
洪建邦
LIU Chengwei;WANG Xian;TANG Yao;KONG Bowen;HONG Jianbang(CISDI Engineering Co.,Ltd.,Chongqing 401122,China)
出处
《炼铁》
北大核心
2025年第4期62-66,共5页
Ironmaking
关键词
顶燃式热风炉
燃烧器
交错喷口
浓淡燃烧
氮氧化物
风温
shaftless hot blast stove
burner
staggered injection nozzles
fuel-rich/lean combustion
nitrogen oxides(NO_(x))
blasttemperature
作者简介
通信作者:刘成伟,高级工程师,E-mail:chengwei.liu@cisdi.com.cn。
