著者

内藤 誠章 武田 幹治 松井 良行

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.1, pp.2-30, 2014 (Released:2013-12-31)

参考文献数

218

被引用文献数

9 14

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The modern blast furnace operation at integrated steel works in Japan has started in 1901 by the first blown-in of Higashida No. 1 blast furnace in Yawata Works, while a 150 years history of Japanese steel industry has dated back to the first western blast furnace built by T. Ohashi in 1857. The steel industry has been supporting the Japanese economy as a key industry which supplies base materials for social infrastructure and developments throughout the pre and post war periods.After the recovery period from the war destruction, Chiba Works of Kawasaki Steel Corp., were built and started its operation in 1953 as the first integrated steel works in Keiyo Industrial Region after the war. During the rapid growth period, many coastal steel works equipped with a large blast furnace more than 3000m3 and some of 5000m3 were built for the efficient marine transportation of raw materials and steel products. Most advanced technologies, high pressure equipment, stave cooler system and bell-less charging system etc., were introduced, improved and has risen to the top level in the world with low reducing agent ratio (RAR), energy saving and long service life of a blast furnace and coke ovens.Energy shift from oil to coal by the oil crisis, cost oriented operation design and technology were tackled and the hot metal of about 80 million tons is manufactured with 27 blast furnaces including over 5000m3 large scale blast furnaces in 2012. During this period, our industry has faced many economical and social pressures of high exchange rate of yen, oligopoly of mining market, global warming problem, and surge of iron ore and coal prices by the rapid growth of the BRICs. We have kept our competitive positions by developing advanced technologies on pulverized coal injection, extended use of low cost iron resources, recycling for environment and CO2 mitigation technologies.Prospects of ironmaking technologies for other decades are discussed by reviewing various papers published and looking back the history of ironmaking developments during the last 100 years.

著者

篠竹 昭彦 松崎 眞六 国友 和也 内藤 誠章 橋本 操 圃中 朝夫 長根 利弘 永嶺 謙忠 田中 宏幸

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.95, no.10, pp.665-671, 2009

被引用文献数

1 7

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The visualization of the inner state of a blast furnace was investigated by exploiting the feature of cosmic-ray muon that attenuates according to the density and the thickness of the object through which it penetrates. The distribution of the cosmic-ray muon accumulated in an object in a blast furnace during a certain period has been determined by a probing system provided with two sets of a pair of panels with plastic scintillation counters segmented in parallel along each direction of both sides. First, measurement was performed in the furnace hearth structure that had been taken out after the shutdown of Oita No. 2 Blast Furnace repaired in 2004. Next, another measurement was performed in the same manner in the renewed furnace hearth of Oita No. 2 Blast Furnace which had just started working after its repairs. The density of the material at the iron-rich portion inside the hearth was estimated from the accumulation ratio obtained from the relation between the intensity of the muon channel passing through the iron-rich part in the hearth and that passing through its opposite channel symmetric to the coordinate origin. Then, the level of the furnace bottom brick, meaning its eroded thickness, was estimated from those accumulation ratios in relation to each channel crossing both the iron-rich part and the furnace bottom brick. The possibility of the density distribution of the material inside a blast furnace and the remaining thickness of bricks being estimated by this measurement method was identified.

著者

篠竹 昭彦 内藤 誠章 尾松 保彦 赤木 一志 坪田 淳 村瀬 伸 菊池 善悦 鈴木 啓之

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.99, no.3, pp.185-190, 2013 (Released:2013-02-28)

参考文献数

7

被引用文献数

1 2

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In the scrap-melting operation of shaft furnaces, an operation technology with use of 100% small size blast furnace coke for solid fuel instead of typically utilizing foundry coke has been established. An operation technology with use of 100% steel scrap without using return scrap containing 3-4 % carbon for ferrous raw material, and 70% or more of steel scrap consists of shredder scrap, has been established as well.This technology was first developed with one-stage tuyere operations using only lower tuyeres. Next two-stage tuyere operations using lower and upper tuyeres has been developed to explore more efficient operation.In the two-stage tuyere operation, the number of pipes, the diameter, and the protruding length of the upper tuyeres were examined as parameters, an operation technology with high efficiency was established, which enabled us to achieve high productivity and low coke ratio.