The Effect of the Pattern of the Cohesive Zone on Silicon Concentration in Molten Metal in the Lower Part of Blast Furnace during Operation

Baba, Masaki; Wakuri, Shinjiro; Inoué, Yoshihiro; Ashimura, Toshikatsu; Naito, Masaaki

doi:10.2355/tetsutohagane1955.80.2_89

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…4) Low Si operation at NKK 22) was oriented toward a lower flame temperature in order to suppress SiO gas generation, but had the disadvantage of high RAR. On the other hand, low Si operation at Nippon Steel 19) was oriented toward smaller siliconizing areas by lowering the cohesive zone while lowering RAR, 17,159) which also had the effect of increasing the oxygen partial pressure in front of the tuyeres by high FeO slag dripping to suppress the production of SiO gas and facilitate the slag-metal desiliconization reaction.…”

Section: Low Si Operation Technologymentioning

confidence: 99%

“…Tsuchiya et al 18) obtained the relationship between the molten iron Si content and the shape of the cohesive zone in the blast furnace, while Baba et al 159) used the cohesive zone level observed by the belly probe at Nippon Steel Oita No. 2 blast furnace to correlate the cohesive zone level with the Si content.…”

Section: Low Si Operation Technologymentioning

confidence: 99%

“…New sensors were developed for direct measurement inside the blast furnace; this included a rigid vertical probe equipped with a fiber scope 120) at Nippon Steel Muroran Works, a furnace belly probe at Nippon Steel Oita No. 2 blast furnace, 159,[171][172][173] and a tuyere probe 174) and sideways tuyere probe 160) at Kawasaki Steel Chiba No. 5 blast furnace.…”

Section: Artificial Intelligence (Ai) and Other Operationmentioning

confidence: 99%

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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: Low Si Operation Technologymentioning

confidence: 99%

Section: Low Si Operation Technologymentioning

confidence: 99%