Improvement of Blast Furnace Reaction Efficiency by Use of High Reactivity Coke

Naito, Masaaki; Okamoto, Atsushi; Yamaguchi, Kazuyoshi; Yamaguchi, Takeshi; Inoué, Yoshihiro

doi:10.2355/tetsutohagane1955.87.5_357

Cited by 139 publications

(103 citation statements)

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“…These included SCOPE21 SCOPE21 is a technology featuring strengthened coal preprocessing and high speed carbonization, and was adopted in new coke ovens at Nippon Steel Oita Works in 2008 and Nippon Steel Nagoya Works in 2013. As technologies for reduced CO2 emissions and realizing low RAR operation, technologies for thermal reserve zone temperature control and chemical equilibrium control were developed 113,115) (see section 5.1), and at JFE East Japan Works (Keihin), injection of natural gas was adopted in the blast furnace and sintering process. 52,116) A two-stage reduction system 117) combining partially-reduced iron ore manufacturing in natural gas producing countries and use of the product ore in Japanese blast furnaces was proposed as a globally-oriented CO2 reduction technology that also encompasses use of inferior quality resources.…”

Section: Transition To Larger Blast Furnaces Streamliningmentioning

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

Self Cite

106

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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: Transition To Larger Blast Furnaces Streamliningmentioning

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

Self Cite

106

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“…In the middle part of blast furnace the so called thermal reserve zone kept at a constant temperature of around 1 000°C is formed due to the heat balance and equilibrium constraint. 1) This is probably because the rate of solution loss reaction is slow below 1 000°C. The solution loss reaction is enhanced in the lower part of blast furnace, and the direct reduction reaction (1c) becomes significant at the bottom of blast furnace where molten FeO can contact intimately with coke at temperatures over 1 300°C.…”

Section: Introductionmentioning

confidence: 99%

“…4 shows that the CO formation rate was much larger than the CO 2 formation rate, and the CO formation rate reached a maximum at 600°C at which the reduction rate reached a maximum. 1) for the reduction of an IOC in the atmosphere simulating blast furnace. The RR profile of the Micro-Fe 2 O 3 /Coke shifted to higher temperature range than the other three IOC samples.…”

Section: Rr =mentioning

confidence: 99%

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Enhancement of Reduction Rate of Iron Ore by Utilizing Iron Ore/Carbon Composite Consisting of Fine Iron Ore Particles and Highly Thermoplastic Carbon Material

et al. 2011

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Decreasing the thermal reserve zone temperature is believed to increase the energy efficiency of blast furnace iron-making. To do so, either the direct reduction reaction rate or the coke gasification reaction rate must be significantly increased below 1 000°C in CO-lean atmosphere. An iron ore/carbon composite (IOC) has been proposed as a new raw material that can enhance the reduction rate of iron ore. In this paper the possibility of the reduction rate enhancement was examined by preparing a kind of ideal IOC sample consisting of nano-sized Fe2O3 particles (10-70 nm in diameter) and a carbon material prepared from a thermoplastic resin. The nano-sized Fe2O3 particles in the IOC sample were surprisingly reduced to Fe in a few minutes at as low as 650°C in an inert atmosphere. This was realized by increasing the interfacial area between the Fe2O3 particles and carbon and by establishing intimate contact between the two. The carbon in the IOC sample was also completely gasified in less than 10 minutes at as low as 750°C in a CO2 atmosphere. The dramatic enhancement of the gasification rate was found to be realized by the enhancement of one of the direct reduction reactions, the reaction between Fe3O4 particles and carbon, by the aid of in-situ XRD measurement. This suggested that the enhancement of both the reduction reaction rate and the gasification reaction rate is realized by the same mechanism. These new findings will give a clue for designing IOC samples applicable to the blast furnace iron-making.KEY WORDS: iron ore/carbon composite; ultrafine Fe2O3 particles; thermoplastic carbon; in situ XRD; rapid reduction of iron ore.

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“…So far, reducing the thermal reserve zone temperature is expected to reduce CO 2 emissions and/or energy consumption from blast furnaces. [1][2][3] Therefore, the technical development of ironmaking materials that are rapidly reducible is very important to solve these problems. However, iron materials with a low reduction disintegration index (RDI) are required for use in blast furnace because the reduction disintegration occurs in the upper region of the blast furnace by the reduction of hematite to magnetite in lump ore/sinters with a volumetric expansion, which causes a loss of permeability in the blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Fate of Nitrogen and Sulfur during Reduction Process of Carbon-containing Pellet Prepared by Vapor Deposition of Gaseous-Tar and the Influences of the Hetero Elements on the Reduction Behavior and Crushing Strength

2018

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Improvement of Blast Furnace Reaction Efficiency by Use of High Reactivity Coke

Cited by 139 publications

References 4 publications

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

Enhancement of Reduction Rate of Iron Ore by Utilizing Iron Ore/Carbon Composite Consisting of Fine Iron Ore Particles and Highly Thermoplastic Carbon Material

Fate of Nitrogen and Sulfur during Reduction Process of Carbon-containing Pellet Prepared by Vapor Deposition of Gaseous-Tar and the Influences of the Hetero Elements on the Reduction Behavior and Crushing Strength

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