基于煤质特性分析的高炉喷吹煤粉性能评价  

Performance evaluation on coal quality characteristics analysis of injection pulverized coal in blast furnace

作　　者：王广伟[1] 吴君毅 杨玉卓 吴胜利[1] 李铄 李海波[1] WANG Guangwei;WU Junyi;YANG Yuzhuo;WU Shengli;LI Shuo;LI Haibo(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Iron Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063210,Hebei,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]首钢京唐钢铁联合有限责任公司炼铁制造部,河北唐山063210

出　　处：《钢铁研究学报》2024年第1期22-32,共11页Journal of Iron and Steel Research

基　　金：国家自然科学基金面上资助项目(52074029,52174295)。

摘　　要：煤质特性是影响高炉喷吹煤粉利用率的重要因素。为优化高炉喷吹燃料结构和降低炼铁成本,对首钢京唐高炉喷吹使用的煤粉的煤质特性进行了深入研究,并提出采用等效灰分替代灰分作为评价不同煤粉高炉喷吹性价比的方法。研究表明:无烟煤具有高固定碳和高发热值,烟煤燃烧性能优异但具有强爆炸性,提质煤与兰炭的各项指标接近无烟煤且价格较低,通过混煤搭配可以实现不同煤粉高炉喷吹的最优效果。焦粉的可磨性和燃烧性较差,焦化除尘灰的燃烧性与焦粉相近,二者作为高炉喷吹燃料使用时会对制粉系统和煤粉利用率产生负面影响。通过Coats-Redfern积分法对不同煤粉的燃烧特性和动力学进行分析,结果表明烟煤的活化能最低,提质煤和兰炭次之,焦粉和焦化除尘灰最高,活化能越低的样品燃烧性越好。等效灰分计算结果表明,烟煤和兰炭灰分中CaO和MgO含量较高,使得等效灰分较低,进行高炉喷吹时可减少渣量,有利于降低燃料比。The coal quality characteristics are an important factor affecting the utilization rate of pulverized coal injection into blast furnaces.In order to optimize the fuel structure of blast furnace injection and reduce ironmaking costs,an in-depth study was conducted on the coal quality characteristics of the coal powder used for injection into Shougang Jingtang blast furnace,and an equivalent ash content was proposed to replace ash content as a method for evaluating the cost-effectiveness of different coal powder injection into blast furnaces.The results show that anthracite had high fixed carbon and heating value,bituminous coal had excellent combustion performance but strong explosive properties.The indexes of upgraded pulverized coal and semi-coke were close to those of anthracite and less expensive.The optimal effect of blast furnace injection can be achieved by blending with different pulverized coals.The combustibility and grindability of coke powder were poor,and the combustibility of coking dust was similar to that of coke powder,which can negatively affect the pulverizing system and the utilization rate of pulverized coal when used as blast furnace injecting fuel.The combustion characteristics and kinetics of different pulverized coals were analyzed by the Coats-Redfern integral method,and the results showed that bituminous coal had the lowest activation energy,followed by upgraded pulverized coal and semi-coke,and coke powder and coking dust had the highest.The samples with lower activation energy had better combustibility.The equivalent ash calculation results showed that the higher CaO and MgO content in bituminous coal and semi-coke made the equivalent ash lower,which can reduce the slag volume when performing blast furnace blowing and is beneficial to reduce the fuel ratio.

关 键 词：高炉炼铁 喷吹煤粉 煤质特性 等效灰分值 动力学 

分 类 号：TF538.63[冶金工程—钢铁冶金]