Effects of particle size composition and burden ratio on burden segregation in the blast furnace throat based on DEM

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-09-28 DOI:10.1016/j.powtec.2024.120319

Z.X. Di, B. Yan, B. Cheng, S.N. Wang, C.L. Fan

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Abstract

In blast furnace charging, burden segregation affects the distribution of gas flow and the efficiency of chemical reactions, which in turn impacts the overall efficiency and quality of ironmaking. This work developed a bell-less top charging model based on the DEM to analyze burden segregation at the furnace throat under various particle size compositions, chute inclinations, and burden ratios. The results show that the burden exhibits a ring-like distribution around the furnace throat, with smaller particles concentrated in the inner ring near the center. When particle size difference of the burden is significant, adjusting the proportion of large or small particles has a more pronounced effect on particle size segregation near the center of the blast furnace. The smaller the chute inclination, the more serious the particle size segregation of the burden. Pellet tends to accumulate near the center of the blast furnace, with a segregation index reaching 0.8 in this region. Adjusting the burden ratio has a more pronounced effect on the segregation of sinter. This work provides theoretical support for charging optimization in blast furnace operation.

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基于 DEM 的粒度组成和炉料比对高炉喉部炉料偏析的影响

在高炉装料过程中，炉料偏析会影响煤气流的分布和化学反应的效率，进而影响炼铁的整体效率和质量。这项研究基于 DEM 开发了无料钟炉顶装料模型，以分析在不同粒度组成、溜槽倾斜度和料比条件下炉料在炉喉处的偏析情况。结果表明，炉料在炉喉周围呈环状分布，较小的颗粒集中在靠近中心的内圈。当炉料粒度差异较大时，调整大颗粒或小颗粒的比例对高炉中心附近的粒度偏析有更明显的影响。溜槽倾斜度越小，炉料粒度偏析越严重。球团倾向于堆积在高炉中心附近，该区域的偏析指数达到 0.8。调整炉料比对烧结矿的偏析有更明显的影响。这项工作为高炉操作中的装料优化提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.