流化床直接还原磁铁矿的CFD-DEM-IBM模拟  

CFD-DEM-IBM simulation of fluidized bed direct reduction of magnetite

作　　者：兰斌 路帅 徐骥[3] 翟明[1] 王军武 LAN Bin;LU Shuai;XU Ji;ZHAI Ming;WANG Junwu(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China;College of Mechanical and Transportation Engineering,China University of Petroleum,Beijing 102249,China;State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;Hualu Engineering and Technology Co.,Ltd.,Xi’an 710065,Shaanxi,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]中国石油大学(北京)机械与储运工程学院,北京102249 [3]中国科学院过程工程研究所介科学与工程全国重点实验室,北京100190 [4]华陆工程科技有限责任公司,陕西西安710065

出　　处：《化工学报》2024年第12期4477-4489,共13页CIESC Journal

基　　金：国家自然科学基金项目(11988102,22311530057);中国科学院战略性先导科技专项(XDA29040200);黑龙江省重点研发计划项目(JD22A018)。

摘　　要：磁铁矿是矿物加工领域直接还原铁的重要原料,流化床直接还原磁铁矿因具有显著降低碳排放、高效传热与传质、高速反应等优势而广泛应用于冶金行业。基于多阻力网络的未反应缩核模型,采用粗粒化CFD-DEM-IBM(计算流体力学-离散单元法-浸没边界法)耦合方法模拟磁铁矿在氢气气氛中的流态化还原过程,考察了不同的粗粒化率对颗粒、气体流动以及反应特性的影响。模拟结果表明,当粗粒化率不大于4时,粗粒化系统和真实系统中颗粒整体的还原特性接近,但气体、颗粒的局部流动特性存在差异。当粗粒化率为3时,计算精度在可允许的范围内,并能显著降低计算量。Magnetite is an important raw material for direct reduced iron in mineral processing.Fluidized bed direct reduction of magnetite is widely used in metallurgical industry because of its advantages of significantly reducing carbon emission,efficient heat and mass transfer and high speed reaction.Based on the unreacted shrinkage core model of the multi-resistance network,the coarse-grained CFD-DEM-IBM(computational fluid dynamics-discrete element method-immersed boundary method)coupling method was used to simulate the fluidized reduction of magnetite in a hydrogen atmosphere.In the process,the effects of different coarse-graining rates on particles,gas flow,and reaction characteristics were investigated.It is shown that when the coarse-graining ratio is less than 4,the reduction characteristics of the whole particles in the coarse-grained system and the real system are similar,but the local flow characteristics of the gas and particles are different.When the coarse-graining ratio is 3,the calculation accuracy is within the allowable range,and the calculation amount can be significantly reduced.

关 键 词：流态化 磁铁矿还原 CFD-DEM 浸没边界法 反应流 粗粒化 

分 类 号：TQ021.1[化学工程]