基于气固对流换热系数计算模型的铁矿烧结传热传质过程模拟  

The simulation of heat and mass transfer in iron ore sintering process based on gas-solid convective heat transfer coefficient calculation model

作　　者：赵改革[1,3] 吴迪 杨淞云 刘柳[2] 喻维纲 汤乐云[3] 伍东玲[2] ZHAO Gaige;WU Di;YANG Songyun;LIU Liu;YU Weigang;TANG Leyun;WU Dongling(Central South University School of Minerals Processing and Bioengineering,,Changsha 410083,Hunan,China;Central South UniversitySchool of Energy Science and Engineering,Changsha 410083,Hunan,China;Hunan Valin Xiangtan Iron&Steel Co.,Ltd.,Xiangtan 411101,Hunan,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学能源科学与工程学院,湖南长沙410083 [3]湖南华菱湘潭钢铁有限公司,湖南湘潭411101

出　　处：《烧结球团》2025年第1期38-44,共7页Sintering and Pelletizing

基　　金：湖南省自然科学基金资助项目(2021JJ40763)。

摘　　要：针对现有铁矿石烧结数值计算中气固换热系数计算模型较多,而相对计算精度不明导致的模型选择困难的问题。本文采用数值模拟与烧结杯试验相结合的方法,对3种常用的气固换热系数计算模型的准确性进行了对比分析。结果表明:对流换热系数增大能够有效提高点火期间固相的温度,降低后续烧结速率以及料层蓄热能力,导致出口烟气成分中O_(2)质量分数更大而CO_(2)质量分数更低。三个模型中,具有最大对流换热系数的计算模型得到的O_(2)质量分数与烧结杯试验更接近,而处于中间的对流换热系数计算模型得到的CO_(2)质量分数和烧结速率与试验更接近。In order to solve the problem that there are many models for calculating the gas-solid heat transfer coefficient in the existing numerical calculation of iron ore sintering,and the relative calculation accuracy is unclear,which leads to the difficulty in selecting the model,the accuracy of three commonly used gas-solid heat transfer coefficient calculation models is compared and analyzed by combining numerical simulation and sinter cup test.The results show that the increase of convective heat transfer coefficient can effectively increase the temperature of the solid phase during ignition and reduce the subsequent sintering rate and the heat storage capacity of the material layer,resulting in a larger O_(2) mass fraction and a lower CO_(2) mass fraction in the outlet gas composition.Among the three models,the O_(2) mass fraction obtained by the calculation model with the maximum convective heat transfer coefficient is closer to the sinter cup test,while the CO_(2) mass fraction and sintering rate obtained by the calculation model with medium convective heat transfer coefficient are closer to the test.

关 键 词：数值计算 气固换热系数 烧结杯试验 烟气成分 

分 类 号：TF046.4[冶金工程—冶金物理化学] TK124[动力工程及工程热物理—工程热物理]