Lowering Si Content in Pig Iron by Powder Injection into Blast Furnace

Haru, Tomio; Saino, Mitsuo; Okumura, Kazuo; Sakaguchi, Y.; Inatani, Toshihiro

doi:10.2355/tetsutohagane1955.71.8_951

Cited by 4 publications

(4 citation statements)

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“…25,26) In the initial stage, a small amount of fine ore (50 kg/thm) was studied for desiliconization in the blast furnace. From 1981 to 1982, injection tests of sinter fines with an average particle diameter range of 2-3 mm were conducted using four tuyeres of Nippon Steel Hirohata No.…”

Section: Multiple Injection Technology As Enhancement Ofmentioning

confidence: 99%

“…In response to subsequent economic and environmental trends, the steel industry has taken on the role of a world leader 4) in driving technological development in various fields of the steel production process, from environment-friendly technologies such as technologies for using low-cost raw materials and reducing agents [5][6][7][8][9][10][11][12][13][14][15] (including low Si operation technology [16][17][18][19][20][21][22][23][24][25][26][27] and high rate pulverized coal injection [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] ), recycling of waste plastics, 44,45) and processing of ironmaking dust [46][47][48][49][50][51] ...…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

104

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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: Multiple Injection Technology As Enhancement Ofmentioning

confidence: 99%

Section: Introductionmentioning

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

104

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“…In the researches and developments on the injection of flux for the reduction of silicon in molten iron carried out between the latter half of the 1980s and the early 1990s, [11][12][13][14][15][16][17][18] basic fluxes primarily comprising of CaO and MgO and high-FeO fluxes were blown in through tuyeres. The research and development discussed here deals with studies and measurements carried out with attention focused on the melting property of the flux and the temperature near the raceway.…”

Section: Mechanism Of Deadman Inactivation and Choice Of Flux For Injmentioning

confidence: 99%

Activation of Deadman State in the Blast Furnace Using Serpentine Injection through Tuyere

et al. 2004

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In the injection test of serpentine through one tuyere executed as a means to improve the furnace lower filling structure, the tuyere sampler insertion depth and the deadman temperature rose greatly by the amount of the fine serpentine injection of 20 kg/t or more. It is presumed for the melting point of slag piling up in the deadman surface part to decrease by the injection of fine serpentine through tuyere, for the fine ratio (Ϫ3 mm) of the melt origin and a slag hold-up ratio to decrease greatly, and for the gas and liquid permeabilities in deadman to have been improved. In addition, the possibility that the desulfurization reaction is able to be promoted efficiently while maintaining the active state of deadman and the possibility of the low temperature operation by the serpentine injection through tuyere were suggested.

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“…Several studies have been carried out in order to elucidate the multiple injection phenomena [5][6][7][8][9] and fundamental experiments have been proposed in order to simulate the blast furnace operating with multiple injection. [9][10][11] However, a detailed mathematical model, which is capable of simulating the multiple injection through the blast furnace tuyere, has not yet been reported. In this paper a mathematical model of the blast furnace is presented to simulate the blast furnace operation with multiple injection of pulverized coal, pre-reduced fine ore and flux.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Multiple Injection of Pulverized Coal, Prereduced lron Ore and Flux with Oxygen Enrichment to the Blast Furnace.

2001

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This paper introduces a modeling of the co-injection of pulverized coal, pre-reduced iron ore and flux into the blast furnace through the tuyere. This model treats the blast furnace as a multi-phase reactor. The pulverized coal and pre-reduced fine ore/flux have different chemical and thermophysical properties, thus these materials are treated as separate phases. Therefore this model considers six phases: gas, lump solids (iron ore, sinter, pellets and coke), pig iron, molten slag, pulverized coal and pulverized iron ore/flux. Conservation equations for mass, momentum, energy and chemical species are solved simultaneously based on the finite volume approach. Two operational practices are investigated. One is the injection of pre-reduced fine iron ore and pulverized coal, and the other is the co-injection of pre-reduced fine ore, flux and pulverized coal. The simulation results have contributed to better understanding the blast furnace phenomena with multiple injectants, and supported new improvements in the blast furnace operation. With this model, the injection of pulverized iron ore and flux together with pulverized coal has been proved to be possible at high rates keeping stable blast furnace operation. Moreover, the silicon content can be lowered and the furnace productivity can be largely increased.KEY WORDS: blast furnace; mathematical model; multi-phase flow; pulverized coal injection; iron ore injection; flux injection. and the effects of this method were examined. Mathematical Model General Conservation EquationThe mathematical model is two dimensional and axisymmetric. It analyses the packed bed region within the blast furnace, from the surface of the slag in the hearth up to the burden surface in the throat. Unlike previous model, 12,13) this model handles pulverized coal and pre-reduced fine ore/flux as different phases. Therefore, in order to simulate multiple injection the model considers six phases in the packed bed, namely, gas, solids, hot metal, molten slag, pulverized coal and pre-reduced fine ore/flux. Each phase consists of one or more components having its own composition and physical properties. All phases are treated at the same time because those phases interact with one another. Thus the governing equations of all materials, that form a large set of strongly coupled equations, are solved simultaneously. In this model conservation equations for the prereduced fine ore/flux are newly introduced to describe the fields of velocity, volume fraction, chemical species and energy for this new phase.Governing conservation equations for all phases are expressed via a general equation, represented by Eq (1), which is independent of the coordinate system.In this equation i represents the phase being considered. The complete set of chemical species for each phase considered in this model is summarized in Table 1. The other variables considered are the phase velocity components, pressure or volume fraction and energy. The source terms are due to inter-phase interactions that can be through chemical r...

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Lowering Si Content in Pig Iron by Powder Injection into Blast Furnace

Cited by 4 publications

References 0 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

Activation of Deadman State in the Blast Furnace Using Serpentine Injection through Tuyere

Numerical Analysis of Multiple Injection of Pulverized Coal, Prereduced lron Ore and Flux with Oxygen Enrichment to the Blast Furnace.

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