首页|A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

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Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex phase change process of iron ore particles in this zone is still not well understood.In this study,a novel one-dimensional(1D)unsteady phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore particles.After model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was discussed.The results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption capacity.Consequently,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movement of the phase interface and pro-longing the melting duration of the particles.Increasing the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting process.Under the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4％and 8.3％,respectively.Elevating the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve melting.Among the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

Blast furnaceIron ore meltingCohesive zoneHeat transfer Phase change

Dianyu E、Yingming Wen、Jiayun Dan、Youyuan Jiang、Guangchao Wei、Jiaxin Cui

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Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems,Jiangxi University of Science and Technology,Nanchang,330013,China

International Institute for Innovation,Jiangxi University of Science and Technology,Nanchang,330013,China

Ironmaking Plant,Xiangtan Iron and Steel Corporation of Hunan Hualing,Xiangtan,411101,China

School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo,255000,China

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National Natural Science Foundation of China projectNational Natural Science Foundation of China projectChina Postdoctoral Science Foundation FundingJiangxi Provincial Natural Science FoundationJiangxi Provincial Natural Science FoundationJiangxi Provincial Natural Science FoundationJiangxi Provincial Natural Science FoundationOpening Research Projects of State Key Laboratory of Advanced MetallurgyResearch Project from Xiangtan Iron and Steel Corporation of Hunan HualingNanchang 100-100 Plan Foundation

52264042519041222021M69097520212BDH8100120212BAB21402320223AAG0100920214BBG74005K22-03 & 04

2024

10.1016/j.partic.2023.06.020

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.86(3)
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