Injection of COREX off-gas into ironmaking blast furnace

Lingling Liu; Shibo Kuang; Baoyu Guo; Aibing Yu

doi:10.1016/j.fuel.2022.126688

Injection of COREX off-gas into ironmaking blast furnace

Lingling Liu, Shibo Kuang, Baoyu Guo, Aibing Yu

Research output: Contribution to journal › Article › Research › peer-review

17 Citations (Scopus)

Abstract

Oxygen blast furnace (OBF) is a promising ironmaking technology to realize low carbon emissions. It is featured in high oxygen-enriched operations and suffers from excessively high gas flame temperature. Aiming to overcome this problem, COREX off-gas (CROG) after CO₂ and dust removal, which mainly consists of CO and H₂, is proposed to be injected into an industrial BF operated with different oxygen enrichments. Such a process is studied using an integrated BF model. The effects of CROG on coal combustion, BF shaft states, and overall performance are analyzed in detail. The results show that the CROG injection under the same target flame temperature is beneficial for improving coal combustibility, therefore allowing a higher coal injection rate to achieve better fuel economy. As the CROG injection rate increases to reach the same hot metal temperature, the coke rate initially decreases and then increases, leading to an optimum injection rate in terms of fuel consumption. The decrease is contributed by the enhanced indirect reduction of the H₂ in the CROG. The decline is because of the extra coke combustion for the energy supply to heat the shaft burden and hot metal. All the results suggest that CROG injection helps realize OBF.

Original language	English
Article number	126688
Number of pages	15
Journal	Fuel
Volume	334
Issue number	Part 1
DOIs	https://doi.org/10.1016/j.fuel.2022.126688
Publication status	Published - 15 Feb 2023

Keywords

COREX off-gas
Hydrogenous gas
Integrated BF model
Oxygen blast furnace
Pulverized coal
Raceway combustion

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10.1016/j.fuel.2022.126688

Cite this

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title = "Injection of COREX off-gas into ironmaking blast furnace",

abstract = "Oxygen blast furnace (OBF) is a promising ironmaking technology to realize low carbon emissions. It is featured in high oxygen-enriched operations and suffers from excessively high gas flame temperature. Aiming to overcome this problem, COREX off-gas (CROG) after CO2 and dust removal, which mainly consists of CO and H2, is proposed to be injected into an industrial BF operated with different oxygen enrichments. Such a process is studied using an integrated BF model. The effects of CROG on coal combustion, BF shaft states, and overall performance are analyzed in detail. The results show that the CROG injection under the same target flame temperature is beneficial for improving coal combustibility, therefore allowing a higher coal injection rate to achieve better fuel economy. As the CROG injection rate increases to reach the same hot metal temperature, the coke rate initially decreases and then increases, leading to an optimum injection rate in terms of fuel consumption. The decrease is contributed by the enhanced indirect reduction of the H2 in the CROG. The decline is because of the extra coke combustion for the energy supply to heat the shaft burden and hot metal. All the results suggest that CROG injection helps realize OBF.",

keywords = "COREX off-gas, Hydrogenous gas, Integrated BF model, Oxygen blast furnace, Pulverized coal, Raceway combustion",

author = "Lingling Liu and Shibo Kuang and Baoyu Guo and Aibing Yu",

note = "Funding Information: The authors are grateful to the Australian Research Council and the Natural Science Foundation of China NSFC (52034003) for the financial support of this work, and the China Scholarship Council (CSC) for LL Liu (201708510077), and the Australian National Computational Infrastructure for the high-performance computation. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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AU - Liu, Lingling

AU - Kuang, Shibo

AU - Guo, Baoyu

AU - Yu, Aibing

N1 - Funding Information: The authors are grateful to the Australian Research Council and the Natural Science Foundation of China NSFC (52034003) for the financial support of this work, and the China Scholarship Council (CSC) for LL Liu (201708510077), and the Australian National Computational Infrastructure for the high-performance computation. Publisher Copyright: © 2022 Elsevier Ltd

PY - 2023/2/15

Y1 - 2023/2/15

N2 - Oxygen blast furnace (OBF) is a promising ironmaking technology to realize low carbon emissions. It is featured in high oxygen-enriched operations and suffers from excessively high gas flame temperature. Aiming to overcome this problem, COREX off-gas (CROG) after CO2 and dust removal, which mainly consists of CO and H2, is proposed to be injected into an industrial BF operated with different oxygen enrichments. Such a process is studied using an integrated BF model. The effects of CROG on coal combustion, BF shaft states, and overall performance are analyzed in detail. The results show that the CROG injection under the same target flame temperature is beneficial for improving coal combustibility, therefore allowing a higher coal injection rate to achieve better fuel economy. As the CROG injection rate increases to reach the same hot metal temperature, the coke rate initially decreases and then increases, leading to an optimum injection rate in terms of fuel consumption. The decrease is contributed by the enhanced indirect reduction of the H2 in the CROG. The decline is because of the extra coke combustion for the energy supply to heat the shaft burden and hot metal. All the results suggest that CROG injection helps realize OBF.

AB - Oxygen blast furnace (OBF) is a promising ironmaking technology to realize low carbon emissions. It is featured in high oxygen-enriched operations and suffers from excessively high gas flame temperature. Aiming to overcome this problem, COREX off-gas (CROG) after CO2 and dust removal, which mainly consists of CO and H2, is proposed to be injected into an industrial BF operated with different oxygen enrichments. Such a process is studied using an integrated BF model. The effects of CROG on coal combustion, BF shaft states, and overall performance are analyzed in detail. The results show that the CROG injection under the same target flame temperature is beneficial for improving coal combustibility, therefore allowing a higher coal injection rate to achieve better fuel economy. As the CROG injection rate increases to reach the same hot metal temperature, the coke rate initially decreases and then increases, leading to an optimum injection rate in terms of fuel consumption. The decrease is contributed by the enhanced indirect reduction of the H2 in the CROG. The decline is because of the extra coke combustion for the energy supply to heat the shaft burden and hot metal. All the results suggest that CROG injection helps realize OBF.

KW - COREX off-gas

KW - Hydrogenous gas

KW - Integrated BF model

KW - Oxygen blast furnace

KW - Pulverized coal

KW - Raceway combustion

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Injection of COREX off-gas into ironmaking blast furnace

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ARC Research Hub for Computational Particle Technology

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Injection of COREX off-gas into ironmaking blast furnace

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ARC Research Hub for Computational Particle Technology

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