Improvement in Blast Furnace Reaction Efficiency through the Use of Highly Reactive Calcium Rich Coke

Nomura, Seiji; Ayukawa, Hiroyuki; Kitaguchi, Hisatsugu; Tahara, Toshihide; Matsuzaki, Shinya; Naito, Masaaki; Koizumi, Satoshi; Ogata, Yoshikuni; Nakayama, Tsuneyoshi; Abe, Tetsuya

doi:10.2355/tetsutohagane1955.92.3_223

Cited by 14 publications

(13 citation statements)

References 4 publications

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“…Utilization of high reactivity coke is one possibility to achieve this. In a Japanese Muroran BF, the use of high-reactivity coke decreased the fuel rate by 10 kg/thm (roughly 2%) [37]. High reactivity coke could also improve the softening and melting properties of iron ore [40].…”

Section: Implications On the Blast Furnace Process And Further Develomentioning

confidence: 99%

“…Despite the general standard of using low reactivity coke in blast furnaces, in recent years a significant research interest has been shown towards the utilization of highly-reactive coke [36][37][38][39][40]. The interest for using high reactivity coke arises from theoretical considerations, which show that a decrease in the equilibrium temperature between reducing gas and wüstite (Fe 1−x O) in the BF shaft can increase the gas utilization rate (CO 2 /CO-ratio), resulting in lower fuel consumption [38], which would bring significant economic savings.…”

Section: Implications On the Blast Furnace Process And Further Develomentioning

confidence: 99%

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Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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Abstract:The aim of this research was to investigate the effects of charcoal and Kraft-lignin additions on the structure, cold compression strength, and reactivity of bio-cokes produced at the laboratory scale. Bio-cokes were prepared by adding charcoal and Kraft-lignin (2.5, 5.0, 7.5, and 10.0 wt %) to medium-volatile coal and coking the mixture with controlled heating rate (3.5 • C/min) up to 1200 • C. In addition, four particle sizes of charcoal were added with a 5 wt % addition rate to investigate the effect of particle size on the compression strength and reactivity. Thermogravimetric analysis was used to evaluate the pyrolysis behavior of coal and biomasses. Optical microscopy was used to investigate the interaction of coal and biomass components. It was found that by controlling the amount of charcoal and Kraft-lignin in the coal blend, the compression strength of the bio-cokes remains at an acceptable level compared to the reference coke without biomass addition. The cold compression strength of the charcoal bio-cokes was higher compared to Kraft-lignin bio-cokes. The reactivity of the bio-cokes with charcoal addition was markedly higher compared to reference coke and Kraft-lignin bio-cokes, mainly due to the differences in the physical properties of the parental biomass. By increasing the bulk density of the coal/biomass charge, the cold compression strength of the bio-cokes can be improved substantially.

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Section: Implications On the Blast Furnace Process And Further Develomentioning

confidence: 99%

Section: Implications On the Blast Furnace Process And Further Develomentioning

confidence: 99%

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

et al. 2017

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“…In recent years, the fundamental study about their production and reaction has been carried out. While the effect of reduction of reducing agent rate has been already observed by the short term test using actual blast furnace for the high reactivity coke, 1,2) production of coke including calcium catalyst [2][3][4] and ferrocoke 5,6) as the high reactivity coke is being developed. The authors are, for the purpose of reduction of reducing agent rate in blast furnace, developing "carbon composite iron ore hot briquette" 7) using the thermal plasticity of coal as a new production method of carbon composite agglomerate which is one of the high reactivity carbonaceous materials.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Reducing Agent Rate in Blast Furnace Operation by Carbon Composite Iron Ore Hot Briquette

et al. 2011

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“…[1][2] By feeding ferro-coke, normally together with iron ores, the thermal reserve zone temperature will decline, as a result, the indirect reduction degree will raise and RAR will be decreased. [3][4] This is the reason why ferro-coke is considered a promising novel burden material for BF ironmaking process. Two processes have been tried for ferro-coke production, i.e.…”

Section: Introductionmentioning

confidence: 99%

Impact of Zinc on Gasification Reaction and Post-Reaction Strength of Ferro-coke

Li¹,

Wei²,

Bi³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Ferro-coke is an iron-containing novel kind of coke, to clarify its behavior of CO2 gasification under Zn recirculating condition in the blast furnace is very important for its practical application in BF production. In this paper, the weight loss of ferro-coke was determined with a thermogravimetric balance, the variation in exhaust gas composition at several different temperatures were measured with a gas analyzer. The results revealed that zinc has catalytic effect on CO2 gasification in respect to the decrease in starting gasification temperature and the increase of burning-off degree. And also for ferro-coke, the reactivity increased while the post-reaction strength decreased along with the zinc content increasing. Generally speaking, the impact of zinc on ferro-coke thermal properties is weaker than potassium. INTRODUCTION.

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Improvement in Blast Furnace Reaction Efficiency through the Use of Highly Reactive Calcium Rich Coke

Cited by 14 publications

References 4 publications

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Effect of Charcoal and Kraft-Lignin Addition on Coke Compression Strength and Reactivity

Reduction of Reducing Agent Rate in Blast Furnace Operation by Carbon Composite Iron Ore Hot Briquette

Impact of Zinc on Gasification Reaction and Post-Reaction Strength of Ferro-coke

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