废塑料与高炉喷吹煤混合燃烧行为及其对理论燃烧温度的影响  

Co-combustion behavior of waste plastics and blast furnace injection coal and its influence on theoretical combustion temperature

作　　者：徐润生[1] 尉继勇 叶涟 张建良[1] 张楠 滕海鹏 XU Runsheng;YU Jiyong;YE Lian;ZHANG Jianliang;ZHANG Nan;TENG Haipeng(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究学报》2024年第1期44-54,共11页Journal of Iron and Steel Research

基　　金：钢铁冶金新技术国家重点实验室自主课题资助项目(41620025,41620026,41621009)。

摘　　要：高炉喷吹是资源化、高效化处理数量庞大的废弃塑料制品的有效途径,因此系统研究了废塑料和高炉喷吹煤混合喷吹时燃烧行为及其对风口回旋区热状态作用机制。研究结果表明,废塑料高挥发分、无灰分、燃烧性能好的特点是其进行高炉喷吹的优势。高炉喷吹废塑料能提高炉腹煤气量,对理论燃烧温度有一定的降低效果。基于实验研究和理论计算结果,从提高喷吹燃料燃烧强度、效率及稳定高炉理论燃烧温度的角度出发,废塑料替代20%的无烟煤是较为合适的混合喷吹比例。同时高炉喷吹废塑料可以在合理范围内提高煤气量和还原气(H_(2)+CO)比例,促进高炉间接还原发展进而降低焦比,是实现高炉喷吹燃料结构优化和低碳绿色发展的有效路径。The injection of waste plastics into the blast furnace is an effective method for recycling and efficiently treating large quantities of plastic wastes.The co-combustion behavior of plastic with coal and its impact on the thermal state of the raceway zone was systematically studied.The results indicate that waste plastics injected into the blast furnace offer advantages such as high volatile content,lower ash content,and good combustion performance.The injection of waste plastics into the blast furnace can increase the bosh gas volume and partially reduce the theoretical combustion temperature.Based on the experimental and theoretical calculations,replacing 20%anthracite with waste plastic as a mixed injection ratio is a more suitable approach for enhancing the combustion intensity and efficiency of the injected fuel,as well as stabilizing the theoretical combustion temperature.Additionally,injecting waste plastics into the blast furnace can increase the gas volume and the(H_(2)+CO)ratio within a reasonable range,which promotes indirect reduction and reduces the coke ratio.This approach offers an effective pathway to optimize the fuel structure of blast furnace injection and achieve low-carbon and green development.

关 键 词：高炉 废塑料 燃烧行为 风口回旋区 理论燃烧温度 

分 类 号：TF526[冶金工程—钢铁冶金]