烧结配加钢铁厂污泥对烟气及产质量的影响  

Effect of adding steel plant sludge into sintering process on flue gas and production quality

作　　者：胡琰[1] 赵贺喜 齐鹏宇 丁龙 钱立新 龙红明 HU Yan;ZHAO Hexi;QI Pengyu;DING Long;QIAN Lixin;LONG Hongming(Ministry of Energy and Environment,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China;School of Metallurgical Engineering,Anhui University of Technology,Maanshan 243032,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling,Maanshan 243002,Anhui,China)

机构地区：[1]宝山钢铁股份有限公司能源环境部,上海201900 [2]安徽工业大学冶金工程学院,安徽马鞍山243032 [3]冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《钢铁》2024年第12期152-161,共10页Iron and Steel

基　　金：国家自然科学基金资助项目(52204332)。

摘　　要：钢铁工业推行的“固废不出厂”发展模式要求企业生产过程产生的固废在厂内进行消纳利用。钢铁厂各工序产生的污泥种类包括氧化铁泥、OG(Oxygen Converter Gas Recovery)粗粒、碳酸钙污泥、酸碱中和污泥、连铸污泥和生物污泥等,其成分复杂,厂内无害化处置是当前企业面临的难题。钢铁厂污泥含有铁、碳等有价元素,采用烧结工艺处置是固废资源化利用的有效途径之一。以国内某钢铁企业生产过程产生的多种污泥为研究对象,开展了污泥加热燃烧试验和配矿烧结试验,通过检测烟气成分和烧结矿产质量指标评估了烧结工序消纳污泥的可行性和极限配比。结果表明,污泥加热燃烧过程形成了SO_(2)、CO、HCl、NO_(2)、NO、CH_(4)、VOCs(挥发性有机物)等污染物,其中CO和SO_(2)排放量较高,分别达到16.94和12.10 mg/g(污泥),VOCs排放量达到2.58 mg/g(污泥)。将污泥进行配矿烧结,导致烧结烟气中SO_(2)、NO、CH_(4)和VOCs的排放浓度显著升高。当污泥添加比例为5%时,SO_(2)、NO、CH_(4)和VOCs的吨烧结矿排放量较基准试验分别增加143%、44%、219%和1 577%。随着污泥配加比例从0%逐渐提升至7%,烧结矿的产质量指标呈现先提高后降低的趋势。污泥添加比例由0增加到3%,烧结利用系数和垂直烧结速度有提高趋势。随着污泥添加比例继续增加,烧结产质量指标均有所降低。因此,污泥在烧结工艺中消纳处理会造成烟气污染物排放浓度增加和产质量指标的下降,在烧结烟气净化系统处理能力有富余的情况下,污泥在烧结原料中添加量(质量分数)需要控制在3%以内。The development model of"solid waste does not leave the factory",implemented by the iron and steel industry,requires that all solid waste generated during the production process be consumed and utilized within the factory.This model presents a challenge due to the complex composition of various types of sludge produced in iron and steel plants,including iron oxide mud,OG coarse grain,calcium carbonate sludge,acid-base neutralization sludge,continuous casting sludge,and biological sludge.These sludges contain valuable elements such as iron and carbon,and the sintering process offers an effective method for recycling this solid waste.The recycling of various sludges from a domestic iron and steel enterprise using sludge heating combustion and ore blending tests was investigated.The feasibility and optimal sludge addition ratio in the sintering process were assessed by analyzing the composition of flue gases and the quality indices of sintered minerals.The results indicate that sludge heating combustion leads to the formation of pollutants such as SO_(2),CO,HCl,NO_(2),NO,CH_(4),and VOCs,with particularly high emissions of CO and SO_(2),which reached 16.94 and 12.10 mg/g(sludge),respectively.VOCs emissions are measured at 2.58 mg/g(sludge).Furthermore,when sludge is blended with ore for sintering,there is a significant increase in the emission concentrations of SO_(2),NO,CH_(4),and VOCs.With a 5%sludge addition ratio,the emissions per ton of sinter of these compounds increase by 143%,44%,219%,and 1577%,respectively,compared to baseline tests.The yield and quality index of the sinter initially improve but begin to decline as the sludge addition ratio increases from 0%to 7%.Notably,when the sludge addition ratio increases from 0 to 3%,both the sintering utilization coefficient and the vertical sintering speed improve.However,further increases in sludge addition leads to a decrease in the quality index of sintering production.Therefore,to avoid an increase in the emission concentration of flue gas pollutants and a decli

关 键 词：钢铁厂污泥 加热燃烧 铁矿烧结 烟气污染物 产质量 

分 类 号：X70[环境科学与工程—环境工程]