Development of High Ratio Coke Mixed Charging Technique to the Blast Furnace

Watakabe, Shiro; Takeda, Kanji; Nishimura, Hirobumi; Goto, Shigeaki; Nishimura, Nozomu; Uchida, Tatsuo; Mitsuru, Kiguchi

doi:10.2355/isijinternational.46.513

Cited by 67 publications

(64 citation statements)

References 9 publications

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“…6 blast furnace, and confirmed a decrease in the coke rate due to an increased gas utilization ratio, decreased heat loss and stable permeability in the lower part of the furnace. 4) These studies showed that coke mixed charging is an effective technique for achieving stable low coke rate operation.…”

Section: )mentioning

confidence: 99%

“…Especially in mixed coke charging operation, the minimum coke layer thickness seems to be different from that in conventional charging because the permeability of the cohesive zone is improved by mixed coke charging. 4) Therefore, it is important to elucidate the mechanism of the minimum coke layer thickness and clarify the minimum coke layer thickness in mixed coke charging.…”

Section: )mentioning

confidence: 99%

“…This is caused by the reduced permeability of the ore layer due to softening of the ore at temperatures over 1 200°C. 4) Thus, it is important to develop new equipment which can simulate this type of horizontal gas flow in order to quantify the effect of the coke layer thickness on permeability.…”

Section: )mentioning

confidence: 99%

“…This technique has been examined in various laboratory studies. For example, softening tests under load confirmed that the permeability of a softening sinter layer containing mixed coke was improved by generation of local spaces around the mixed coke, [4][5][6] and that reducibility was improved by promotion of the reaction between the ore and mixed coke. [7][8][9][10] In a gas flow analysis using a DEM-DFD, a 50% coke mixed condition showed the lowest pressure drop, especially in low coke rate operation.…”

Section: Introductionmentioning

confidence: 99%

“…In turn, this delay of the reduction reaction causes dropping of unreduced FeO, 3) heat shortage and expansion of the cohesive zone. 4) Therefore, for stable low coke rate operation, it is necessary to improve permeability and reducibility.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Evaluating Effect of Coke Layer Thickness on Permeability by Pressure Drop Estimation Model

Ichikawa¹,

Kashihara²,

Oyama³

et al. 2017

ISIJ International

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Recently, low coke rate blast furnace operation has been required in response to the rising cost of coking coal. However, the thickness of the coke layer decreases in low coke rate operation. Since it is known that the gas permeability of the blast furnace deteriorates as the coke layer thickness decreases, it is important to determine the minimum coke layer thickness for stable blast furnace operation. On the other hand, the minimum coke layer thickness has not been clarified due to a lack of equipment capable of measuring the effect of the coke layer thickness on permeability.In this study, a new experimental device called the cohesive zone simulator was developed to clarify the minimum coke layer thickness. In the cohesive zone, gas flows horizontally along the coke layer. In order to quantify the effect of the coke layer thickness on permeability, this horizontal gas flow should be simulated. Therefore, this simulator simulates a horizontal gas flow.Next, the effect of the coke layer thickness was quantified by using the cohesive zone simulator. The results showed that melting iron ore penetrated into the coke layer and closed part of the layer. These phenomena caused a deterioration of permeability under thin coke layer thickness conditions. Finally, a pressure drop estimation model considering penetration of the coke layer by melting ore was developed with the aim of quantifying the minimum coke slit thickness.

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Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluating Effect of Coke Layer Thickness on Permeability by Pressure Drop Estimation Model

Ichikawa¹,

Kashihara²,

Oyama³

et al. 2017

ISIJ International

View full text Add to dashboard Cite

show abstract

Effect of Mixed Charge of Ore and Lump Coal on the Softening‐Melting Property of the Burden

Guo¹,

Guang-qing²,

Zhang³

et al. 2013

4th International Symposium on High‐Temperature Metallurgical Processing

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Reduction of Pellets‐Nut Coke Mixture under Simulating Blast Furnace Conditions

Mousa

Senk

Babich

2010

steel research int.

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In recent years an intensive work has been carried out to decrease the coke losses of the blast furnace through mixing small‐sized coke called “nut coke” in the iron ore burden layers. In order to clarify the influence of nut coke on the pellets reducibility, industrial iron ore pellets were reduced with and without nut coke participation under different temperatures and atmospheres. Isothermal and non‐isothermal reduction tests under simulating blast furnace conditions were performed using an experimental laboratory rig. Furthermore, reflected light microscopy, scanning electron microscopy and X‐ray technique were applied to characterize the microstructure and different phases developed in the origin and reduced pellets. Pellets reduced isothermally without nut coke participation exhibited reduction retardation (RR) at elevated temperature (≥1373 K) whereas the presence of nut coke had a positive effect of preventing such phenomena. The non‐isothermal reduction of pellets showed that, as the amount of nut coke in pellets bed increased, the reducibility of pellets increased, too. The rate controlling mechanism of pellets and pellets‐nut coke mixtures was predicted from the correlation between apparent activation energy calculations and microstructure examination.

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Development of High Ratio Coke Mixed Charging Technique to the Blast Furnace

Cited by 67 publications

References 9 publications

Evaluating Effect of Coke Layer Thickness on Permeability by Pressure Drop Estimation Model

Evaluating Effect of Coke Layer Thickness on Permeability by Pressure Drop Estimation Model

Effect of Mixed Charge of Ore and Lump Coal on the Softening‐Melting Property of the Burden

Reduction of Pellets‐Nut Coke Mixture under Simulating Blast Furnace Conditions

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