摘要
高炉喷吹煤粉是目前高炉冶炼降低焦比最为有效的措施之一,然而高炉喷吹煤粉种类繁多,为了保持较高的煤/焦置换比和降低高炉冶炼喷吹成本,需要对喷吹煤种进行合理的选择和搭配。以国外某钢厂提供的12种煤粉为原料,系统进行了其作为高炉喷吹煤粉所关注的基础性能和工艺性能分析,根据测试结果对不同煤粉进行高炉喷吹的综合性能进行了研究,为钢厂高炉喷吹煤粉的优化选择提供指导。研究结果表明,提供的12种煤粉中4号为高变质无烟煤,6号、7号和12号为高变质贫瘦煤,5号、10号和11号为低变质贫瘦煤,1号、2号、3号、8号和9号为低变质烟煤。相比于国内高炉喷吹用的煤粉,该钢厂提供的12种煤粉具有较低的灰分和硫含量,进行高炉喷吹能够降低渣量和入炉硫负荷;同时,所选煤粉的喷流性、流动性较高,灰熔融温度较高,低变质烟煤具有强爆炸性,不能单独作为高炉喷吹使用;不同煤粉的可磨性和燃烧性能差异较大,成为限制其应用于高炉喷吹生产的关键。结合不同煤粉高炉喷吹综合性能评价指标的计算结果,优选8号、10号、11号和12号煤粉作为高炉喷吹煤粉使用。考虑不同煤粉的采购成本,12号煤粉用于高炉喷吹降低冶炼的成本最为显著。
Pulverized coal injection is one of the most effective measures to reduce coke ratio in blast furnace production.To obtain a higher coal/coke replacement ratio and reduce the cost of blast furnace production,it is necessary to select and match the coal injection types reasonably from a varieties range of coal.12 types of coal provided by foreign steel plant were selected as experimental materials,and their basic property and process property which played a key role of pulverized coal injection in blast furnace were investigated systematically.Furthermore,comprehensive performance of different pulverized coal was studied based on the basic property result of test,and provided a guidance for optimal selection of pulverized coal injection into blast furnace.The results are shown that among the 12 kinds of coal powders,No.4 is high metamorphic anthracite,No.6,No.7 and No.12 are high metamorphic meager-lean coal,No.5,No.10 and No.11 are low metamorphic meager-lean coal,and No.1,No.2,No.3,No.8 and No.9 are low metamorphic bituminous coal.Compared with the pulverized coal injected into blast furnace in China,the 12 kinds of pulverized coal provided by foreign steel plant have lower ash and sulfur content,it is beneficial to reduce the amount of slag and sulfur load.Meanwhile,the pulverized coal has good jet performance,high fluidity and higher ash fusion temperature.Low metamorphic bituminous coal is explosive and cannot be used as blast furnace coal injection alone.The grindability and combustion performance of different coal powders vary greatly,which is the key to limit their application in blast furnace injection production.According to the calculation results of comprehensive performance evaluation indexes of different pulverized coal in blast furnace,the No.8,No.10,No.11 and No.12 pulverized coal were selected as pulverized coal into blast furnaces.Considering the different cost of pulverized coal,the No.12 pulverized coal was selected to inject into blast furnace can reduce the production cost most significantly.
作者
李涛
苏步新
王广伟
梁旺
张翠柳
任坤
LI Tao;SU Bu-xin;WANG Guang-wei;LIANG Wang;ZHANG Cui-liu;REN Kun(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Bejing 100083,China;China Metallurgical Industry Planning and Research Institute,Beiing 100711,China)
出处
《钢铁》
CAS
CSCD
北大核心
2022年第6期22-31,共10页
Iron and Steel
基金
国家自然科学基金资助项目(52074029,51804026)。
关键词
高炉
喷煤
选煤
综合性能
性价比
工艺特性
blast furnace
pulverized coal injection
coal preparation
comprehensive performance
cost performance
process performance
