Liquid Flow in Blast Furnace Hearth Concentrated on Inner Packed Structure

Shinotake, Akihiko; Ichida, Morimasa; Ootsuka, Hajime; Sugizaki, Yoichi

doi:10.2355/tetsutohagane1955.87.5_388

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…[1][2][3][4] Many researchers attempted to solve the issues by using experimental and mathematical models. [1][2][3][4][5][6][7][8][9][10][11] However, there are many problems to understand drainage behavior in a blast furnace hearth because several important hearth values such as coke diameter, void fraction, and levels of iron and slag cannot be measured during a tap. Because of these issues, the effects of the various in-furnace conditions on the stable operation were not examined well.…”

Section: Introductionmentioning

confidence: 99%

Effect of Various In-furnace Conditions on Blast Furnace Hearth Drainage

2005

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Stable blast furnace operation is required to reduce energy consumption and CO 2 emission in iron and steelmaking industry. For the stable blast furnace operation, precise controlled drainage is one of the important factors. Therefore, in this work, the effect of coke diameter, void fraction, coke diameter distribution, coke free space, impermeable zone, slag viscosity in a blast furnace hearth on drainage rates, gas-slag and slag-iron interfaces shapes and maximum gas-slag interfaces height were examined with a three-dimensional mathematical model.The results indicate that the conditions of the peripheral region at the taphole level determine the residual slag volume. The packed bed in the region 2.0 m from the taphole has about 50 % of contribution to the residual slag volume. The void fraction change has the largest effect on the gas-slag interfaces height. The coke diameter distribution has little effect on the total drainage rate as well as the coke diameter of the uniform packed bed, coke free space, and impermeable zone bellow the taphole level. The taphole conditions dominate the total drainage rate under the terms of the assumed blast furnace conditions. The conditions of the peripheral region in the hearth determine the drainage rate patterns of the iron and slag. The peripheral region's permeability can be predicted from the drainage rate patterns of iron and slag, if precise measurement of the drainage rate patterns can be achieved. A drainage pattern, whether iron drains prior to slag or slag drains prior to iron, is largely affected by a drainage interval.

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Section: Introductionmentioning

confidence: 99%

Effect of Various In-furnace Conditions on Blast Furnace Hearth Drainage

2005

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“…By focusing attention to the packing structure of a hearth portion by carrying out model experiments and using a mathematical model, the authors have been conducting an investigation of molten iron flow. 21) And they have reported that in comparison with a case where the whole hearth is a coke-packed bed, when the deadman floats and a coke-free zone is formed, the molten iron flow velocity under the taphole increases and the temperature rises. In the above-described Tobata No.…”

Section: Considerations Of Effect Of Blast-furnace Operation and Flowmentioning

confidence: 99%

Investigation of Blast-furnace Hearth Sidewall Erosion by Core Sample Analysis and Consideration of Campaign Operation.

et al. 2003

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“…Recently, behavior of molten pig iron and slag in the hearth are analyzed by continuum models. [38][39][40] The renewal of deadman and the generation of free space are caused by buoyancy of molten iron, consumption of coke in tuyere and carbonization of coke, and the motion of coke particles in the hearth is located in a complicated state. Thus, the application of particle method for coke motion in the hearth is an effective simulation method.…”

Section: Analysis Of the Phenomena In The Hearthmentioning

confidence: 99%

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

Ueda¹,

Natsui²,

Nogami³

et al. 2010

ISIJ Int.

149

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Currently low reducing agent operation of blast furnace has been actively pursued in ironmaking due to the global warming. The precise and reliable control of blast furnace aiming at the low reducing operation is required to attain smoothly the stable operation. It is considered that the mathematical model on the ironmaking process can play an important role to ensure the stable blast furnace operation. A mathematical model is a powerful tool to improve conventional processes and to design new processes in ironmaking. These tendencies and requirements are common to every country. Thus, the development of advanced mathematical models of blast furnace like DEM (Discrete Element Method) has attracted a special attention in ironmaking field. Moreover, the combined model of DEM with the continuum model is under development for the purpose of the accurate understanding of inner state of blast furnace. In this paper, the recent activity and progress on the development of advanced mathematical model of blast furnace and future perspective for desirable model are described.KEY WORDS: ironmaking; blast furnace; mathematical model; discrete element method; solid flow; particle method; contiuum model. Review Fig. 1. Transition of blast furnace operating condition in Japan.

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Liquid Flow in Blast Furnace Hearth Concentrated on Inner Packed Structure

Cited by 12 publications

References 8 publications

Effect of Various In-furnace Conditions on Blast Furnace Hearth Drainage

Effect of Various In-furnace Conditions on Blast Furnace Hearth Drainage

Investigation of Blast-furnace Hearth Sidewall Erosion by Core Sample Analysis and Consideration of Campaign Operation.

Recent Progress and Future Perspective on Mathematical Modeling of Blast Furnace

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