Reaction Behaviors of Various Agglomerates in Reducing the Temperature of the Thermal Reserve Zone of the Blast Furnace

Higuchi, Kenichi; Kunitomo, Kazuya; Nomura, Seiji

doi:10.2355/isijinternational.isijint-2020-115

Cited by 6 publications

(7 citation statements)

References 26 publications

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“…The main iron-bearing feedstock of the BF is the sinter. In general, the starting temperature of CSLR is around 1000 C and it can be lowered to 835 C. [1,2,12] Therefore, the upper and lower limits of CSLR starting temperature are set as 1000 and 840 C, respectively. More specifically, the starting temperature of CSLR ranges from 1000 to 840 C with an interval of 20 C. In view of the current actual situation, the maximum top pressure is set as 3 atm.…”

Section: Operational Conditions and Computational Algorithmmentioning

confidence: 99%

“…Hence, researchers have proposed to improve the gaseous reduction of iron ore (known as indirect reduction) in BFs and lower the reducing agent rate by decreasing the TRZ temperature. [1][2][3][4][5][6][7][8][9][10][11][12] The temperature of the TRZ (the zone where the heat exchange between the gas and solid in the BF shaft is slow) [13,14] in the abovementioned method corresponds to the temperature at the TRZ lower edge where the coke solution loss reaction (CSLR) begins, [1,2,5] i.e., the starting temperature of the CSLR. Consequently, the lower edge of the TRZ is typically considered as the boundary between the direct and indirect reduction regions in the BF, and it determines the size of the indirect reduction region.…”

Section: Introductionmentioning

confidence: 99%

“…In actual production, the starting temperature of the CSLR, which affects the TRZ state, is typically reduced by increasing the coke reactivity index (CRI) to improve gas utilization efficiency and reduce carbon consumption, [1][2][3][4][5][6][7][8][9][10][11][12] although some researchers argued that the relationship between the decrease in the starting temperature of the CSLR and the improvement in the CRI is weak. [15] Nomura et al reported that highly reactive calcium-rich coke was used in Muroran No.…”

Section: Introductionmentioning

confidence: 99%

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A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

Meng

Shao

et al. 2022

steel research int.

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Section: Operational Conditions and Computational Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

Meng

Shao

et al. 2022

steel research int.

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“…Reactions (4-5) are the coke solution loss reaction and the coke combustion, Reactions (6)(7)(8)(9) are the BCB reactions in the upper BF. Reactions (10)(11)(12)(13)(14)(15) are the melting of solid burden. Reaction (16) is the direct reduction of molten FeO.…”

Section: Bf Modelmentioning

confidence: 99%

“…[8][9][10][11][12] Recently, charging carbon composite briquette in BF is considered to be a promising technology in BF ironmaking for energy saving and it has been applied in industrial practices. [13][14][15][16] Therefore, charging biochar composite briquette (BCB) could be an alternative to introduce renewable carbon into BF. The difficulty in using BCB in BF is its poor strength under the BF environment.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

2022

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Partial replacement of coal and coke by biomass/biochar in the blast furnace (BF) ironmaking is important role to reduce CO 2 emissions. In this research, numerical investigations were conducted on blast furnace (BF) operation with biochar composite briquette (BCB) charging. The BCB was with 11.1 mass% carbon, 72.7 mass% magnetite, 11.25 mass% wustite, 0.77 mass% metallic iron, and 4.67 mass% gangue, and the BCB charging ratio was from 0 to 60% Results revealed that in the BF operation with BCB charging, the BCB iron-oxide reached a full reduction, but the overall gasification degree of BCB biochar decreased with the increase of BCB charging ratio. By charging BCB, the thermal state in the upper BF was considerably altered, but it was insignificantly influenced in the lower BF. By charging BCB; ore reduction was retarded in the upper BF but was prompted near the zone with a temperature of 1 173 K. Under a low BCB charging ratio, local gas utilization tended to increase in the mid BF but tended to decrease in the upper BF. Further increasing BCB charging ratio lead to a decrease in local gas utilization. To ensure BF smooth running and maximizing biochar input, the optimal BCB charging ratio was 40%. Under this condition, the BCB biochar of 89.3 kg/tHM could be completely utilized, and the BF coke rate was decreased by 92.1 kg/tHM.

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Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

Liu

Chen

et al. 2022

steel research int.

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Iron and steel are one of the most important industrial raw materials, and are thus considered as a pillar of the Chinese economy. [1,2] The iron and steel industries play an important role in the national economy of China and are the foundation of its rapid industrialization and urbanization. [3] Steel production and consumption in China were 996.63 and 945.27 million tons in 2019, accounting for 53% and 50% of the world's total steel production and consumption, respectively. [4] However, iron and steel production are one of the most energy-and carbon-intensive processes in the world, and they account for more than 5% of the world's annual energy demand. [5][6][7] It is well known that carbon dioxide emission contributes to climate change and is likely to have an adverse effect on human health. [8] China has proposed the goal of achieving carbon emissions peak by 2030 and will strive to be carbon neutral by 2060. [9] Driven by the carbon neutrality target, a rapid and far-reaching clean iron and steelmaking process is expected. At present, the most common iron and steelmaking process involves a long process, named blast furnace-basic oxygen furnace (BF-BOF), which accounts for 90% of China's steel production and is emissionintensive, mainly owing to its reliance on coal. [4] In the presently used iron and steel production processes, energy consumption and CO 2 emissions mainly derive from the ironmaking process. Therefore, decreasing CO 2 emissions and reducing the energy consumption of the blast furnace used in ironmaking are of great importance for the sustainable development of the steel industry in China. [10] In the long term, hydrogen metallurgy has great potential due to its low-carbon emission levels and high efficiency for iron and steelmaking processes. However, the high cost of green hydrogen production has made it difficult for China to absolutely adopt this process. Above all, decreasing carbon emissions and energy consumption through the update of present BF-BOF processes has important practical implications. In recent years, iron coke has become one of the most popular research directions for low-carbon ironmaking in blast furnaces. [11][12][13][14][15][16] Iron coke, which is also named as ferro coke and iron carbon agglomerates, is one of several innovative highly reactive cokes used as blast furnace burdens. Iron coke is helpful for energy saving, CO 2 emissions reduction, and green production of iron in the ironmaking process because it uses cheap coal resources, is highly reactive in the reduction process (in relation to the reaction rate of coke with CO 2 ), and decreases the thermal reserve zone temperature of the blast furnace. [17][18][19][20] In the iron coke carbonization process, approximately 70% of iron oxides in the iron ore powder added to coal are reduced to metallic iron. [21] Metallic iron helps decrease the starting temperature for gasification because it has a catalytic effect on the gasification process. [22] Besides, the number of pores in iron coke is greater

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Reaction Behaviors of Various Agglomerates in Reducing the Temperature of the Thermal Reserve Zone of the Blast Furnace

Cited by 6 publications

References 26 publications

A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

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Reaction Behaviors of Various Agglomerates in Reducing the Temperature of the Thermal Reserve Zone of the Blast Furnace

Cited by 6 publications

References 26 publications

A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

A Numerical Study on the State of the Blast Furnace Thermal Reserve Zone under Different Starting Temperatures of Coke Solution Loss Reaction

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

Effect of CO2 Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength

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Effect of CO₂ Gasification on High‐Temperature Characteristics of Iron Coke: In Situ Compressive Strength