Experimental and DEM study of segregation of ternary size particles in a blast furnace top bunker model

Yu, Yaowei; Saxén, Henrik

doi:10.1016/j.ces.2010.06.025

Cited by 112 publications

(80 citation statements)

References 28 publications

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“…23 flow of sintered ore and coke into blast furnaces; 33,34,46 size-segregation of magnetic particles in chutes; 47 numerous powder pharmaceutical applications including transport, blending, granulation, milling, compression and film coating; 22 and, sieving or screening. 5,25 However, of particular interest to this research, is the investigation of steady-state segregation profiles for varying density and size differences in chute flows by Khakhar et al…”

Section: The Discrete Particle Methodsmentioning

confidence: 99%

Modeling of Particle Size Segregation: Calibration Using the Discrete Particle Method

Thornton

Weinhart

Luding

et al. 2012

Int. J. Mod. Phys. C

135

160

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Over the last 25 years a lot of work has been undertaken on constructing continuum models for segregation of particles of different sizes. We focus on one model that is designed to predict segregation and remixing of two differently sized particle species. This model contains two dimensionless parameters, which in general depend on both the flow and particle properties. One of the weaknesses of the model is that these dependencies are not predicted; these have to be determined by either experiments or simulations.We present steady-state simulations using the discrete particle method (DPM) for bi-disperse systems with different size ratios. The aim is to determine one parameter in the continuum model, i.e., the segregation Péclet number (ratio of the segregation velocity to diffusion) as a function of the particle size ratio.Reasonable agreement is found; but, also measurable discrepancies are reported; 1 October 21, 2011 10:39 2 Thornton, Weinhart, Luding and Bokhove mainly, in the simulations a thick pure phase of large particles is formed at the top of the flow. In the DPM contact model, tangential dissipation was required to obtain strong segregation and steady states. Additionally, it was found that the Péclet number increases linearly with the size ratio for low values, but saturates to a value of approximately 7.35.

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Section: The Discrete Particle Methodsmentioning

confidence: 99%

Modeling of Particle Size Segregation: Calibration Using the Discrete Particle Method

Thornton

Weinhart

Luding

et al. 2012

Int. J. Mod. Phys. C

135

160

View full text Add to dashboard Cite

show abstract

“…The hardness of the particles and the dashpot are related to Young's modulus and the coefficient of restitution, respectively, while the friction is expressed with a Coulomb-type friction law. The particle forces and torques (see the Appendix [21][22][23][24][25][26][27] ) give rise to particle motion, which is integrated from the differential Eqs. (1)-(2), simultaneously considering interaction with other particles and boundaries in the system.…”

Section: Discrete Element Methodsmentioning

confidence: 99%

“…The EDEM 25) software was applied to simulate the motion of the particles in the experimental device, with the simplification that the depth of the simulated system was decreased from 150 mm to 80 mm to save compu- tational time. The physical properties used for coke particles, pellet particles and plexiglass wall are reported in Table 1, where pellet and coke data were taken from the literature 26,28) with a constant time step.…”

Section: Discrete Element Methodsmentioning

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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“…The inter-particle forces are summed over the K particles in contact with particle i and depend on the normal and tangential deformations, δ n and δ t . The torque acting on particle i includes two components; one arises from tangential force and the other one is the rolling friction [18][19][20] ... (4) where R i is the distance of the contact point from the center of mass, μ r is the rolling friction coefficient and ω i denotes the unit angular velocity vector of the object at the contact point.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…The physical properties used for spherical coke and pellet particles, and for the walls, including one moving plexiglass plane and two static ones, are reported in Table 2, where pellet and coke data were taken from the literature. 19,21) The bottom moving plane was set as rough plexiglass, which has similar properties as rubber, as show in Table 2. Note that the shear modulus of coke and pellet has little effect on the burden surface and interparticle percolation, so small values for these were used to increase the calculation speed of the model.…”

Section: Numerical Simulation Methodsmentioning

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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Experimental and DEM study of segregation of ternary size particles in a blast furnace top bunker model

Cited by 112 publications

References 28 publications

Modeling of Particle Size Segregation: Calibration Using the Discrete Particle Method

Modeling of Particle Size Segregation: Calibration Using the Discrete Particle Method

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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