Influence of Coke Layer Collapse Phenomenon on Burden Distribution at the Top of Blast Furnace

Okuno, Yoshio; Kunitomo, Kazuya; Irita, Toshiyuki; Matsuzaki, Shinya

doi:10.2355/tetsutohagane1955.72.7_783

Cited by 17 publications

(16 citation statements)

References 1 publication

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“…151,152) All companies developed bell-less burden distribution models in order to take advantage of the high flexibility of bell-less systems in control of burden distribution. 153,154) Using one such model, Kajiwara et al 155) showed that flat charging, which bell-MA charging systems cannot achieve, is possible with bell-less blast furnaces.…”

Section: Bell-less Charging Systemsmentioning

confidence: 99%

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Naito

Takeda²,

Matsui³

2015

ISIJ International

109

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The 150 year history of the Japanese steel industry dates from the first western blast furnace, which was built by T. Ohashi in 1857. Modern blast furnace operation at integrated steel works in Japan started in 1901 with the first blow-in of Higashida No. 1 blast furnace at Yawata Steel Works. Throughout the prewar and postwar periods, the steel industry has supported the Japanese economy as a key industry which supplies basic materials for social infrastructure and development.After the period of recovery following the destruction caused by World War II, Chiba Works of Kawasaki Steel Corporation (now JFE Steel Corporation) was built and began operation in 1953 as the first integrated steel works in the Keiyo Industrial Region after the war. During Japan's period of high economic growth, many coastal steel works with large blast furnaces having inner volumes of more than 3 000 m 3 and even 5 000 m 3 were built to enable efficient marine transportation of raw materials and steel products. Japanese steel makers introduced and improved the most advanced technologies of the day, which included high pressure equipment, stave cooler systems, bell-less charging systems, etc. As a result, Japanese steel works now lead the world in low reducing agent rate (RAR) operation, energy saving, and long service life of blast furnaces and coke ovens.Following the Oil Crises of the 1970s, the Japanese steel industry changed energy sources from oil to coal and implemented cost-oriented operation design and technology. In 2012, the Japanese steel industry produced approximately 80 million tons of hot metal from 27 blast furnaces, including large-scale furnaces with inner volumes over 5 000 m 3 . During this period, the industry has faced many economic and social challenges, such as the high exchange rate of the yen, oligopoly in the mining industry, global warming, and the surge in iron ore and coal prices driven by the rapid growth of the BRICs. The industry has successfully responded to these challenges and maintained its international competitiveness by developing advanced technologies for pulverized coal injection, expanded use of low cost iron resources, recycling for environmental preservation, and CO2 mitigation.In this paper, the prospects for ironmaking technologies in the coming decades are described by reviewing published papers and looking back on the history of developments in ironmaking during the last 100 years.

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Section: Bell-less Charging Systemsmentioning

confidence: 99%

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Naito

Takeda²,

Matsui³

2015

ISIJ International

109

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“…When ore is charged and superimposed on the coke layer surface, the coke surface layer part collapses as it is subject to the loading force. [5][6][7] Little coke layer collapse occurs by charges up to the second rotation, but by charges of the third rotation, the coke layer is greatly scraped, and the collapsing rate increases as the coke flat part increases. This is because when the ore falling angle (q) is reduced, the ore falling trajectory approaches closer to perpendicularity, and the ore falling impact force increases.…”

Section: Effects Of Falling Trajectory On Burden Distributionmentioning

confidence: 99%

“…Under high O/C operation associated with an increase of pulverized coal ratio, it is essential to control coke layer collapse and formation of mixed layer, [5][6][7] and properly maintain the gas flow inside the furnace. In Kobe Steel's bell-less system shown in left figure, flat parts are formed for both ore and coke in the peripheral region to suppress layer collapse, and the thickness ratio of ore to coke shown in right figure is smoothed on peripheral regions, and by coke center charging, 8) the inversed-V cohesive zone is intended to be formed.…”

Section: Effects Of Falling Trajectory On Burden Distributionmentioning

confidence: 99%

Stabilizing Burden Trajectory into Blast Furnace Top under High Ore to Coke Ratio Operation

Matsui¹,

Kasai²,

Ito³

et al. 2003

ISIJ International

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“…Furthermore, in the actual blast furnace, the coke layer thickness after collapse cannot be measured because the coke layer is covered with ore layer. Since many experimental studies have been carried out to investigate the coke collapse and clarify dominant factors [1][2][3][4][5][6]. Some studies have used numerical method like Discrete Element Method (DEM) [7] for better understanding of the phenomena involved.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Coke Layer Collapse during Ore Charging in Ironmaking Blast Furnace by DEM

Narita¹,

Mio²,

Orimoto³

et al. 2017

EPJ Web Conf.

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Abstract.A technical issue in an ironmaking blast furnace operation is to realize the optimum layer thickness and the radial distribution of burden (ore and coke) to enhance its efficiency and productivity. When ore particles are charged onto the already-embedded coke layer, the coke layer-collapse phenomenon occurs. The coke layer-collapse phenomenon has a significant effect on the distribution of ore and coke layer thickness in the radial direction. In this paper, the mechanical properties of coke packed bed under ore charging were investigated by the impact-loading test and the large-scale direct shear test. Experimental results show that the coke particle is broken by the impact force of ore charging, and the particle breakage leads to weaken of coke-layer strength. The expression of contact force for coke in Discrete Element Method (DEM) was modified based on the measured data, and it followed by the 1/3-scaled experiment on coke's collapse phenomena. Comparing a simulation by modified model to the 1/3-scaled experiment, they agreed well in the burden distribution.

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Influence of Coke Layer Collapse Phenomenon on Burden Distribution at the Top of Blast Furnace

Cited by 17 publications

References 1 publication

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Stabilizing Burden Trajectory into Blast Furnace Top under High Ore to Coke Ratio Operation

Modelling of Coke Layer Collapse during Ore Charging in Ironmaking Blast Furnace by DEM

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