Influence of ore/coke distribution on descending and melting behavior of burden in blast furnace.

Ichida, Morimasa; Nishihara, Kazuhiro; Tamura, Kenji; Sugata, Masayasu; Ono, Hajime

doi:10.2355/isijinternational.31.505

Cited by 38 publications

(21 citation statements)

References 4 publications

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“…The variables considered in this work are also listed in the table, which include discharge rate which is related to the coke consumption in raceway, boundary conditions, particles and wall properties such as friction coefficients. The determination of solid discharging rate in the simulation is based on the modified Froude number at the BF throat, 41) Fr s , which is defined as:…”

Section: Simulation Conditionsmentioning

confidence: 99%

Discrete Particle Simulation of Solid Flow in a Model Blast Furnace

Zhou

Zhu

et al. 2005

ISIJ Int.

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This paper reports a numerical study of solid flow in a model blast furnace under simplified conditions by means of discrete particle simulation (DPS). The applicability of the proposed DPS approach is validated from its good agreement with the experiment in terms of solid flow patterns. It is shown that the DPS is able to generate a stagnant zone without any need for any arbitrary treatment, and capture the main features of solid flow within the furnace at a microscopic level. The results confirm that the solid flow in a blast furnace can be divided into four different flow regions. However, the flow is strongly influenced by the front and rear walls in a 2D slot model furnace whereas the predicted stagnant zone decreases significantly with wall sliding friction. In a 3D model with periodic boundary conditions incorporated, a smaller stagnant zone is obtained. The effects of solid flow rate, particle properties such as sliding and rolling friction coefficients on the solid flow are also investigated. The results are analysed in terms of solid flow patterns, solid velocity field, porosity distribution and normal force structure. The implication to blast furnace operation is discussed.

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Section: Simulation Conditionsmentioning

confidence: 99%

Discrete Particle Simulation of Solid Flow in a Model Blast Furnace

Zhou

Zhu

et al. 2005

ISIJ Int.

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“…The inter-particle percolation naturally influences the permeability of the burden layers in the shaft, and, in particular, the cohesive zone where the iron-bearing phases start softening to finally melt. Even though many investigators [10][11][12][13][14][15][16] have studied burden descent in the blast furnace, inter-particle percolation has not attracted much interest.…”

Section: Introductionmentioning

confidence: 99%

Effect of DEM Parameters on the Simulated Inter-particle Percolation of Pellets into Coke during Burden Descent in the Blast Furnace

Yu¹,

Saxén²

2012

ISIJ International

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Inter-particle percolation at the interface between the burden layers in the blast furnace influences the permeability in the lumpy zone, and, in particular, in the cohesive zone, where the iron-bearing materials start softening to finally melt. This paper presents a simulation study of the effect of particle properties on inter-particle percolation of small particles (pellets) into a layer of larger particles (coke) during burden descent in the blast furnace. An expanding experimental device in small scale was applied to mimic the conditions at burden descent in a shaft with growing radius, and results from these experiments were used as a reference for the simulations and to validate the computational results. The simulations, which were based on the discrete element method, studied the effect of factors such as friction and restitution coefficients, shear modulus, as well as pellet diameter on the extent of percolating particles. It was found that coke shape, pellet diameter, static friction and inter-particle rolling friction and restitution had a marked effect on the percolation, while rate of expansion of the device, density of pellet and shear modulus proved to be of minor importance.

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“…In the latter region, a strong percolation of iron-bearing burden into coke may change the characteristics of the coke slits, through which the ascending gas passes almost horizontally. Much work on burden distribution in blast furnaces has been reported and some papers focus on the conditions at burden descent, [1][2][3][4][5][6][7] but very few investigations have studied interparticle percolation 8) and there are practically no papers on a quantification of the percolation during burden descent. Li et al, 9) Bridgwater and Ingram, 10) Lomine and Oger 11) and Zhu et al 12) studied one or a small number of particles percolating into a static particle bed, which is quite different from the situation in an operating blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Inter-particle Percolation Segregation during Burden Descent in the Blast Furnace

Westerlund

Paananen³

et al. 2011

ISIJ Int.

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Inter-particle percolation at the interfaces between burden layers directly influences the permeability of the burden in the shaft of the blast furnace. This paper studies inter-particle percolation of small particles (pellets) into large particles (coke) during the burden descent through small-scale experiments and simulations. A special device was designed for making it possible to consider the effect of the increase in cross-sectional area along with the burden descent. The simulations, which are based on the discrete element method, were first validated using one experimental case. An overall agreement was found between the experiments and the simulations. The velocity distribution of coke and pellet particles in the small bed, the trajectories along the height of the bed and the quantity of percolating particles at different heights of bed were investigated. The results show a considerable inter-particle percolation of pellets into the underlying coke layer at the wall area, but also a percolation over the whole radius of the system. These findings stress the importance of taking measures to prevent percolation by proper design of the charging programs in the operation of the blast furnace.KEY WORDS: discrete element method; particle percolation; burden descent; blast furnace; packed bed.

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Influence of ore/coke distribution on descending and melting behavior of burden in blast furnace.

Cited by 38 publications

References 4 publications

Discrete Particle Simulation of Solid Flow in a Model Blast Furnace

Discrete Particle Simulation of Solid Flow in a Model Blast Furnace

Effect of DEM Parameters on the Simulated Inter-particle Percolation of Pellets into Coke during Burden Descent in the Blast Furnace

Inter-particle Percolation Segregation during Burden Descent in the Blast Furnace

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