摘要
高炉喷吹煤粉技术是降低炼铁能耗,减少污染物和CO_(2)排放量的主要技术措施,目前国内高炉喷吹煤粉的种类以烟煤(YM)和无烟煤(WYM)为主,随着钢铁企业降本增效工作的持续开展,兰炭(LT)和焦化除尘灰(CDQ)也开始应用于高炉喷吹生产。利用程序升温热重法研究了YM、LT、WYM和CDQ四种样品的燃烧特性,系统分析了影响燃烧性能的关键物化特征参数,并利用收缩未反应核模型(GM)、体积模型(VM)和随机孔模型(RPM)分析了不同样品的燃烧动力学行为。结果表明,YM的燃烧性能最好,LT的燃烧性能次之,CDQ的燃烧性能最差,影响燃烧性能的关键因素为固体燃料的碳微晶结构。动力学分析表明,GM、VM和RPM三种模型在描述不同样品燃烧动力学时都具有较好的效果,其中RPM模型在表征LT、WYM和CDQ三个样品的燃烧动力学行为时效果最佳,利用RPM模型计算LT、WYM和CDQ的活化能分别为105.7、115.8和145.5 kJ/mol;YM燃烧过程使用GM模型表征的效果最优,利用GM模型计算YM燃烧活化能为134.9 kJ/mol。
Pulverized coal injection(PCI) technology is the main method to reduce the energy consumption, pollutant emission and CO_(2)emission in ironmaking. Main types of injection fuels for blast furnace in domestic were bituminous coal(YM) and anthracite(WYM). With the continuous development of cost reduction and efficiency improvement in iron and steel enterprises, semi-coke(LT) and coking dust(CDQ) have also begun to be used in blast furnace. The combustion properties of four samples of YM, LT, WYM and CDQ were studied by temperature-programmed thermogravimetric method, and the key physicochemical parameters affecting the combustion performance were systematically analyzed. Meanwhile, the combustion kinetic behavior of different samples was analyzed using the unreacted core model(GM), the volumetric model(VM) and the random pore model(RPM). The results show that the combustion property of YM is the best, followed by LT, and the performance of CDQ is the worst. The key factor affecting the combustion property is the graphitization structure of the solid fuel. From the kinetic analysis, the three models have good effects in describing the combustion kinetics of different samples, and the RPM model is the best model to characterize the combustion kinetics of LT, WYM and CDQ. The activation energies of LT, WYM and CDQ calculated by the RPM model are 105.7, 115.8 and 145.5 kJ/mol, respectively;the combustion kinetics of YM is best characterized by the GM model, and the combustion activation energy of the YM is 134.9 kJ/mol.
作者
张海滨
吴胜利
王广伟
ZHANG Haibin;WU Shengli;WANG Guangwei(School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Qianshun Technology Center,Beijing Shougang Co.,Ltd.,Qian′an 064404,Hebei,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第3期264-276,共13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)。
关键词
高炉炼铁
喷吹煤粉
兰炭
燃烧特性
动力学
blast furnace iron-making
pulverized coal injection
semi-coke
combustion property
kinetics
