摘要
为了减少烧结过程中NOx排放,研究了燃料工艺参数与烧结加湿燃烧对NOx排放的影响。结果表明,烧结烟气中NOx主要由燃料带入,燃料氮元素含量决定了烟气中NOx浓度高低,燃料配比从6%降至4%,NOx浓度平均值从424 mg/m^3降至339 mg/m^3;燃料中碳元素能促进NOx还原反应,同时提供更多热量,促进铁酸钙生成,缩短烧结时间。相对常规烧结,加湿燃烧烧结可以增强料层还原性气氛,增强NO异相还原反应,降低NOx浓度;并提高燃料完全燃烧程度,加快垂直烧结速度,提升烧结矿成品率与转鼓指数;在蒸汽流量0.024 kg/min的工况下进行烧结加湿燃烧,NOx浓度平均值从357 mg/m^3降至338 mg/m^3,转鼓指数提高约1个百分点。
In order to reduce NOx emissions during the sintering process,the effects of fuel processing parameters and combustion air humidification during the sintering on NOx emissions were studied.The results show that the NOx in the sintering flue gas is mainly caused by the fuel,and the NOx concentration in the flue gas is principally dependent on the nitrogen content in the fuel.When the fuel proportioning reduced from 6%to 4%,the average NOx concentration can be reduced from 424 mg/m^3 to 339 mg/m^3;and the carbon element in the fuel can promote the reduction reaction of NOx,thus providing more heat and promoting the formation of calcium ferrite,resulting in the shortening of the sintering time.Compared with the conventional sintering,sintering with combustion air humidification can enhance the reductive atmosphere of the material bed and the heterogeneous reduction of NO,while reduce the NOx concentration.Besides,it can improve the complete combustion of fuel,accelerate the vertical sintering speed,as well as increase the yield of sintered product and drum index.Sintering with combustion air humidification with the steam flow rate of 0.024 kg/min,can result in the average NOx concentration decreased from 357 mg/m^3 to 338 mg/m^3,and the drum index increased by about 1 percentage point.
作者
易正明
覃佳卓
邓植丹
刘强
杜东
聂礼
张东升
YI Zheng-ming;QIN Jia-zhuo;DENG Zhi-dan;LIU Qiang;DU Dong;NIE Li;ZHANG Dong-sheng(Key Laboratory of Iron and Steel Metallurgy and Resources Utilization of the Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Provincial Key Laboratory for New Process of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;National-Provincial Joint Engineering Research Center for High Temperature Materials and Lining Technology,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Shuicheng Iron and Steel Group Co Ltd,Liupanshui 553000,Guizhou,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2020年第4期84-87,91,共5页
Mining and Metallurgical Engineering
基金
国家自然科学基金(51604199)。
关键词
烧结烟气
脱硝
加湿燃烧
烧结燃料
氮氧化物
sintering flue gas
denitration
combustion air humidification
sintering fuel
nitrogen oxides
作者简介
易正明(1973-),男,湖北荆州人,教授,博士,主要研究方向为冶金过程数学模型及烧结工艺优化;通讯作者:覃佳卓(1996-),男,广西柳州人,硕士研究生,主要研究方向为钢铁冶金数学模型与烧结工艺优化。
