铁矿石颗粒尺度相变传热过程的数值模拟  

Numerical simulation on the phase-change heat transfer process of iron ore at particle scale

作　　者：郭苏雅 周鹏 华晴赉 曾嘉 崔佳鑫 蒋友源[2] 鄂殿玉 Guo Suya;Zhou Peng;Hua Qinglai;Zeng Jia;Cui Jiaxin;Jiang Youyuan;E Dianyu(Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems,Jiangxi University of Science and Technology,Ganzhou 341000,China;Xiangtan Iron and Steel Corporation of Hunan Hualing,Xiangtan 411101,China)

机构地区：[1]江西理工大学江西省颗粒系统仿真与模拟重点实验室,江西赣州341000 [2]湖南华菱湘潭钢铁有限公司,湖南湘潭411101

出　　处：《材料与冶金学报》2022年第6期396-401,407,共7页Journal of Materials and Metallurgy

基　　金：国家自然科学基金(51904122);动力工程多相流国家重点实验室开放基金(SKLMF-KF-1901);江西省重点研发计划资助项目(20192BBHL80016);中国博士后科学基金(2021M690975)。

摘　　要：为解析铁矿石颗粒在高炉软熔带内的复杂相变传热过程,采用焓法模型对单颗粒铁矿石加热熔化过程进行分析,获得了铁矿石颗粒内的温度分布、熔化时间和液相的体积分数等变量随时间的演变规律,讨论了铁矿石颗粒粒径、加热气流速度和加热气流温度对熔化过程的影响.结果表明:铁矿石颗粒粒径大小对加热熔化过程的液相析出、相变区厚度和颗粒中心与外表面温差影响最为显著,主要原因是对流换热系数减小导致颗粒换热能力被削弱,颗粒内部导热热阻增大;加热气流速度成倍增大,颗粒熔化时间只微微缩短,而加热气流温度的逐步升高使得颗粒熔化时间有较大程度的缩短,主要原因是在高温环境中辐射换热影响增强.A numerical analysis is performed with enthalpy method on transient melting behaviors of an iron ore particle aiming to analyze its complex phase change and heat transfer characteristics in cohesive zone melting process.The evolution laws of variables such as temperature distribution,melting time and liquid phase volume fraction in the iron ore particles with time were obtained.The effects of the size of iron ore particles,heating gas flow velocity and heating gas flow temperature on the melting process were discussed.The simulation results indicate that the particle size has significant effects on liquid phase generation rate,phase exchange zone thickness and temperature difference between particle center and surface,because the increase in particle size reduces convection heat transfer coefficient and increases thermal resistance,then weakens heat transfer efficiency.The melting time is only slightly shortened when the heating gas flow velocity is doubled,while the particle melting time is greatly shortened when the heating gas flow temperature is gradually increased,mainly due to the enhanced effect of radiation heat transfer in high temperature environment.

关 键 词：铁矿石熔化 相变换热 温度场 相界面 模拟仿真 

分 类 号：TF572[冶金工程—钢铁冶金]