钒钛磁铁矿球团煤基还原颗粒运动及煤粉喷射燃烧数值模拟  

Simulation on particle movement and pulverized coal jet combustion of titano-magnetite pellets during the reduction with coal in rotary kiln

作　　者：刘鹏 宇文超 龚斯宇 刘秉国[1,2] 张利波[1,2] 彭金辉[1,2] Liu Peng;Yu Wenchao;Gong Siyu;Liu Bingguo;Zhang Libo;Peng Jinhui(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Provincial Key Laboratory of Intensification Metallurgy,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]昆明理工大学非常规冶金省部共建教育部重点实验室,云南昆明650093

出　　处：《钢铁钒钛》2021年第4期97-104,共8页Iron Steel Vanadium Titanium

基　　金：国家重点研发计划(2018YFC1900500)。

摘　　要：开展了回转窑内钒钛磁铁矿球团煤基还原颗粒运动及煤粉喷射燃烧数值模拟研究。结果表明,回转窑内三种颗粒在运动过程中存在分层现象和离散料堆现象。离散料堆现象导致了颗粒数轴向周期性波动分布,并结合反应焓变推导出了单个周期内的平均波动能量为E=25.58 MJ;煤粉喷射燃烧过程中燃料射流在重力作用下会形成反弹效果,作用区间长度约2 m,该区域内传质传热过程被强化,易出现局部过热现象,可通过附着配碳和外配碳球团混合配碳的方式削弱能量波动与局部过热,矿石颗粒的附着配碳量约为18.9 g/kg。In this paper,the numerical simulation of on particle movement and pulverized coal injection combustion duringin the coal coal-based reduction of titano-magnetite pellets in rotary kiln was carried out.The results show that there were delamination phenomenon and discrete pile phenomenon in the movement process of three kinds of particles in rotary kiln.The discrete particle piles led to the axial periodic fluctuation distribution of particle number.Combined with the change of reaction enthalpy,the average fluctuation energy in a single period was deduced as?=25.58 MJ;in the process of pulverized coal injection combustion,the fuel jet would form a rebound effect under the action of gravity,and the length of the action zone was about 2 m.The mass and heat transfer process in this zone was strengthened,and the local overheating phenomenon was readily to occur.The energy fluctuation and local overheating could be reduced by the way of attaching carbon with coal powder on the surface of ore pellets and mixing carbon with external coal pellets.The amount of carbon distribution by adhering to ore particles is about 18.9 g/kg.

关 键 词：钒钛磁铁矿 回转窑 还原 数值模拟 颗粒运动 煤粉喷射燃烧 

分 类 号：TF55[冶金工程—钢铁冶金] TF046