Investigation of porosity model construction for high pellet ratio mixed-burden layers in blast furnace

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-29 DOI:10.1007/s10035-025-01577-w

Yating Cui, Ruishuai Si, Zhenyang Wang, Jianliang Zhang, kexin Jiao, Peiyuan Lu

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Abstract

Driven by the “dual carbon” strategy for low-carbon steel transformation, raising the pellet ratio in the blast furnace (BF) burden offers a core technical path to optimize burden structure and cut carbon emissions. The distribution of BF burden critically influences operation by affecting internal gas flow, heat and mass transfer, and chemical reactions. This study employs the discrete element method (DEM) to examine how burden structure affects bed porosity at high pellet ratios, emphasizing mixed-layer formation. Key findings include: (1) Porosity evolution patterns in mixed burden layers under varying furnace charge configurations were characterized. (2) Porosity is minimized at the ore-coke interface because of particle penetration. Additionally, this effect intensifies as the coke-ore size difference increases. (3) Increasing the pellet ratio enhances lump-zone bed porosity and permeability. As the pellet ratio increased from 30 to 90%, bed porosity rose from 33.75 to 36.19%, a 2.43% increase.

Graphical Abstract

Abstract Image

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高炉高球团比混料层孔隙率模型构建研究

在低碳钢转型“双碳”战略的推动下，提高高炉炉料球团比是优化炉料结构、降低碳排放的核心技术路径。高炉炉料的分布通过影响炉内气体流动、传热传质和化学反应对高炉的运行产生重要影响。本研究采用离散元法（DEM）研究了在高球团比条件下，储层结构对床层孔隙度的影响，并强调了混合层的形成。主要发现有：(1)研究了不同炉料配置下混合炉料层孔隙度演化规律。(2)由于颗粒的渗透作用，矿焦界面孔隙度最小。此外，这种影响随着焦矿粒度差的增大而加剧。(3)增大球团比可提高块状带床层的孔隙度和渗透率。随着球团比从30%增加到90%，床层孔隙度从33.75%增加到36.19%，增加了2.43%。图形抽象

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.