Two Dimensional Cold Model Study on Unstable Solid Descending Motion and Control in Blast Furnace Operation with Low Reducing Agents Rate

Kawai, Hideki; Kobayashi, Motofumi; Fukui, Toshifumi

doi:10.2355/tetsutohagane1955.92.12_996

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Consequently the permeability of the packed bed is deteriorated, and the extreme powder accumulation causes the malfunction of the blast furnace. 5) To avoid the operation trouble and maintain the stable operation, it is important to understand the powder motion and accumulation in the packed bed of the blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Passage and Blockage Behaviors of Fine Particles through an Orifice Consists of Coarse Particles

et al. 2015

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Stable operation under low reducing agent rate condition of blast furnace is necessary to realize to contribute solution of global warming. Under low reducing agent rate operation, large amount of powder materials like fine coke and unburnt pulverize coal generate in the furnace. It is known that the heavy accumulation of these powders in the packed bed of blast furnace deteriorates the permeability, and cause operation trouble in extreme case. Thus it is important to understand the flow and accumulation behaviors of powder in packed bed. This paper discussed the powder motion in the packed bed through numerical simulation under simplified condition. A simplified packing structure, namely an orifice consisting of three spherical particles that touched each other and were in equilateral triangle arrangement, was picked out from the packed bed. The powder trajectories passing through this orifice were tracked by using the discrete element method. The simulation results showed that only a few powder particles initiated the blockage of the particle orifice. Additionally the effects of mechanical properties of the particles on the passage and the blockage behaviors were also revealed.KEY WORDS: powder; blockage; packed bed; blast furnace; discrete element method.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Passage and Blockage Behaviors of Fine Particles through an Orifice Consists of Coarse Particles

et al. 2015

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Numerical Simulation on Phenomena of Fine Particles Passing through an Orifice under Gas Flow Condition

et al. 2020

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Computer Simulation of the Effect of Center Charging Solid Density or Frictional Property on the Solid Flow and Deadman Behavior in Blast Furnace

Kawai¹,

Takahashi²

2008

Tetsu-to-Hagane

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Synopsis : A center coke charging method from the top of blast furnace is known for a novel approach to burden distribution and coal combustion. This method is considered as one of the key technologies for keeping gas permeability of deadman in the lower part of blast furnace and producing iron liquid with a stable furnace operation. In recent years, the center charging method is also expected as improving the unsteady behavior with bridging/slipping of solid bed in low reducing agents operation of blast furnace. In the present study, a center charging method with different particle density or friction coefficients is carried out numerically by using a 3-dimensional Discrete Element Method (DEM). Before the numerical analysis, an experimental approach using a two-dimensional cold model is also examined. Alumina sphere was used as representative particle of coke/ore packed bed and the glass sphere was for the center charge. From the experiment, it was found that the height of deadman is reduced dramatically by using the center charging method with the glass sphere. This experimental result was compared with the numerical approach, although the gas flow was not considered in the numerical method. In the numerical results, the void fraction was calculated more precisely compared to the previous numerical two-dimensional calculation. Almost uniform particle flow distribution called a piston flow pattern was fairly maintained by the numerical center charging method, and as the result, the height of deadman was also confirmed reduced numerically compared to the alumina bed only. This result was qualitatively coincident with the experimental flow pattern except for the particle velocity descending faster in the experimental center-charging region, which could be available for the operation of deadman control.

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Two Dimensional Cold Model Study on Unstable Solid Descending Motion and Control in Blast Furnace Operation with Low Reducing Agents Rate

Cited by 3 publications

References 9 publications

Numerical Analysis on Passage and Blockage Behaviors of Fine Particles through an Orifice Consists of Coarse Particles

Numerical Analysis on Passage and Blockage Behaviors of Fine Particles through an Orifice Consists of Coarse Particles

Numerical Simulation on Phenomena of Fine Particles Passing through an Orifice under Gas Flow Condition

Computer Simulation of the Effect of Center Charging Solid Density or Frictional Property on the Solid Flow and Deadman Behavior in Blast Furnace

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