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

doi:10.11949/0438-1157.20240551

Abstract

Abstract:

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.

Key words: fluidization, magnetite reduction, CFD-DEM, immersed boundary method, reaction flow, coarse-graining

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。

关键词: 流态化, 磁铁矿还原, CFD-DEM, 浸没边界法, 反应流, 粗粒化

CLC Number:

TQ 021.1

Bin LAN, Shuai LU, Ji XU, Ming ZHAI, Junwu WANG. CFD-DEM-IBM simulation of fluidized bed direct reduction of magnetite[J]. CIESC Journal, 2024, 75(12): 4477-4489.

兰斌, 路帅, 徐骥, 翟明, 王军武. 流化床直接还原磁铁矿的CFD-DEM-IBM模拟[J]. 化工学报, 2024, 75(12): 4477-4489.

Figures/Tables 2

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