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Iwai, Sadamu; Yamaguchi, Kunio; Sugiura, Saburo; Saitoh, Yasuo; Inagaki, Yutaka

doi:10.4262/denkiseiko.52.219

Cited by 2 publications

(3 citation statements)

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“…Further, 21.8% of the voxels were in the stagnation region to leave the scrap unmelted. Iwai et al 4) reported that metal lumps such as rails and crops required a longer time to be heated inside compared to thin plates and thin tubes. Thus, it is essential to maintain a moderate gas flow around the metal lump.…”

Section:  Stagnationmentioning

confidence: 99%

“…To further reduce the electric power consumption of EAFs, scrap preheating using the waste heat of exhaust gas from EAFs has been proposed and applied practically. Waste heat is approximately 15-18% of the total heat output 4,5) ; its recovery is effective for energy saving. According to Ukai 5) , there are three methods of scrap preheating: 1) waste gas recycling, 2) exclusive preheating using furnaces, and 3) direct clamshell preheating.…”

Section: Introductionmentioning

confidence: 99%

“…Pig iron with a quality comparable to that of a blast furnace can be produced in this furnace, and post-combustion by gas injection from the shaft wall can reduce the fuel ratio and increase productivity. Iwai et al 4) performed preheating experiments on heavy and light scraps, injected high-temperature gas into a preheating tank filled with scraps, and measured the scrap temperature. They provided advice on the charging methods and reported the optimum packing bulk density for thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between the Nonuniformity of Packed Structure and Fluid Permeability in a Model Scrap Preheating Vessel

Tange,

Fujii,

Fujizoe

et al. 2024

ISIJ Int.

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Recycled scrap is used as a raw material in an electric arc furnace (EAF). Certain EAF systems preheat the scrap using its exhaust gas to save energy. However, the actual operations cannot recover sufficient thermal energy of gas owing to non-uniform flow distribution such as blow-out and stagnation to cause the portion that is not melted. This study investigated the relationship between packed structure and gas permeability in a tank filled with random-and multiple-shaped solids. Visualization and flow measurement experiments were conducted. The packing structure was measured using laser-induced fluorescence by scanning a laser sheet through the tank to measure the three-dimensional distribution of the packed structure. The flow velocity distribution was measured using particle image velocimetry by preparing multiple directions of the laser sheet with respect to the water tank and reconstructing a three-dimensional three-component velocity distribution. Under high packing ratio, the flow structure was obstructed by the packing material, resulting in stagnation areas with low flow velocity. In contrast, at low packing ratio, the stagnation area was smaller, and the global flow field was stable. Furthermore, histograms of the flow velocity distributions suggested that stagnation occurred under high packing ratio conditions, while a global flow field occurred at low packing ratios. These results are applicable in the design of preheating equipment, such as exhaust gas recycling, preheating furnace, or clamshell. Thus, this study provides valuable insights into flow nonuniformity and the design of preheating equipment to improve operational efficiency and safety.

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Section:  Stagnationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relationship between the Nonuniformity of Packed Structure and Fluid Permeability in a Model Scrap Preheating Vessel

Tange,

Fujii,

Fujizoe

et al. 2024

ISIJ Int.

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A Study on Preheating Temperature and Oxidation Characteristics of Steel Scrap in EAF Operation

Yoo

2023

Resour. Recycl.

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An eco-friendly, new type of electric arc furnace(EAF) that utilizes its off gas to preheat the iron scrap, the primary raw material of the furnace, has been recently developed. Scrap preheating furnaces consume up to 30% less energy than conventional EAFs. This study investigated how the off-gas dust collection rate and the type of scrap used in the recently developed EAF affect the preheating temperature of the scrap and its oxidation rate. A 1/6 linear scale model of the ecological and economical arc furnace(ECOARC) owned by Dongkuk Steel was constructed and tested. Steel scrap was charged into the preheating shaft of the EAF and preheated using its off-gas. The scrap preheating temperature depended on the off-gas dust collection rate and type of scrap used. It increased in the order of turnings, lightweight scrap, shredded scrap and heavy scrap. The scrap oxidation rate also depended on the type of scrap used and increased in the same order as the scrap preheating temperature. At the preheating temperature of the turnings, the oxidation rate of the scrap was almost of turnings fed to the newly developed EAF, the ratio of carbon to oxygen within it can be controlled.

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Cited by 2 publications

References 0 publications

Relationship between the Nonuniformity of Packed Structure and Fluid Permeability in a Model Scrap Preheating Vessel

Relationship between the Nonuniformity of Packed Structure and Fluid Permeability in a Model Scrap Preheating Vessel

A Study on Preheating Temperature and Oxidation Characteristics of Steel Scrap in EAF Operation

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