Numerical Simulation of Coexisting Solid-liquid Slag Trickle Flow in a Coke Bed by the SPH Method with a Non-Newtonian Fluid Model

Natsui, Shungo; Sawada, Akinori; Nogami, Hiroshi; Kikuchi, Tatsuya

doi:10.2355/isijinternational.isijint-2019-701

Cited by 9 publications

(2 citation statements)

References 23 publications

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“…When using a multisphere discrete-element method (MS-DEM) treatment, both the coke particles and the dispersed phase can be directly tracked in packed bed structures with different cokes morphology. [15][16][17] Moreover, the Eulerian-Lagrangian (E-L) coupling scheme, also known as the computational fluid dynamics-DEM (CFD-DEM) approach that enables the investigation of the interactions between gaseous and solid phases, has been used to solve the gas flow field in various coke bed structures. 18) Using the E-L coupling approach, the two-phase fines-gas flow in a coke bed can be directly determined in accordance with the coke degradation behavior, which is used as an input.…”

Section: Methods For Simulating Gas Permeability Of a Coke Bed Including Fines Based On 3d Imaging On The Coke Particle Morphologymentioning

confidence: 99%

Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology

Natsui

Hirai

Terui³

et al. 2021

ISIJ Int.

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In ironmaking blast furnaces, the particle size distribution and voids in the coke bed affects the upward flow of gas, and consequently, the efficiency of the combustion reaction. To clarify the influence of coke pulverization on the packing structure of the coke bed, the permeability of the bed was evaluated using detailed dynamics simulation and geometric data analysis. To obtain detailed 3D morphology of the coke, we derived digital geometric data using rotational strength tests. Using the Euler-Lagrange coupling approach with the multisphere discrete-element method, the effect of the volume fraction of fines and distribution in the coke bed on the gas flow was analyzed. The void shape in the 3D coke bed structure was quantified using geometric data and simulated gas flow distributions. Although a continuous void network was observed in the packed bed before pulverization, areas of highly restricted (or no) gas flow were observed after pulverization. The dominant effect of coke degradation on the packed bed structure was the disruption of the gas flow path because of fines clogging the pores and narrowing the gas flow path. The developed simulation method can comprehensively analyze the effects of coke degradation on the gas flow distribution in the coke bed and can be used to analyze and control the instability of industrial blast furnaces.

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Section: Methods For Simulating Gas Permeability Of a Coke Bed Including Fines Based On 3d Imaging On The Coke Particle Morphologymentioning

confidence: 99%

Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology

Natsui

Hirai

Terui³

et al. 2021

ISIJ Int.

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“…The increase in solid phase in the molten slag predicts an increase with viscosity. 23) Therefore, to further clarify the behavior of the slag temperature and viscosity during heat fluctuations, the amount of solids precipitated in the slag with different components and different heats was calculated by Fact-Sage thermodynamics software.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Thermal Stability of Molten Slag in Blast Furnace Hearth

et al. 2021

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The thermal stability of the molten slag plays an extremely important role in the smooth production of the blast furnace. In this paper, the effects of basicity, Al 2 O 3 content and MgO content on the thermal stability of the slag during heat fluctuations were investigated. The effect of slag basicity and composition on slag viscosity behavior was measured by the rotating cylinder method under the condition of heat fluctuation and constant temperature. The slag temperature and solid phase precipitation under thermal fluctuations were calculated. The effect of thermal fluctuations of the slag on viscosity was clarified. The results show that the specific heat capacity of the slag first decreases and then increases as the slag basicity increases, and it increases with the rise of Al 2 O 3 as well as MgO. The average viscosity change rate of slag under fixed heat is much more pronounced than that of at a constant temperature with the variation of slag basicity as well as Al 2 O 3 , while it is inverse for the effect of MgO. When the slag heat is reduced, the change in slag basicity has the greatest effect on the slag temperature, followed by the Al 2 O 3 content and MgO content. It indicates that MgO helps to maintain a stable slag temperature. Therefore, appropriately increasing the basicity of the slag, controlling a lower Al 2 O 3 content and maintaining a suitable MgO content will help to improve the thermal stability of the slag.

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Investigation of Molten Liquids Flow in the Blast Furnace Lower Zone: Numerical Modelling of Molten Slag Through Channels in a Packed Bed

Dong

Jayasekara

Sert

et al. 2020

Metall Mater Trans B

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Numerical Simulation of Coexisting Solid-liquid Slag Trickle Flow in a Coke Bed by the SPH Method with a Non-Newtonian Fluid Model

Cited by 9 publications

References 23 publications

Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology

Method for Simulating Gas Permeability of a Coke Bed Including Fines Based on 3D Imaging on the Coke Particle Morphology

Thermal Stability of Molten Slag in Blast Furnace Hearth

Investigation of Molten Liquids Flow in the Blast Furnace Lower Zone: Numerical Modelling of Molten Slag Through Channels in a Packed Bed

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