The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

Song, Hongli; Zhang, Jinpeng; Cheng, Gongjin; Yang, Shuren; Xue, Xiangxin

doi:10.1002/srin.201900501

Cited by 10 publications

(2 citation statements)

References 21 publications

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“…[14][15][16] The researches of blast furnace smelting V-Ti bearing burden prove that the slag thickening and foaming is caused by Ti(C, N) during the production process, which deteriorates the liquid and gas permeability of the V-Ti bearing burden and destroys the stable operation of blast furnace. [17][18][19] Thermodynamic calculation shows that the theoretical formation temperature of TiC in the TiO 2 -C-Ar system is 1 343.2°C, which is about 200°C higher than the formation temperature of TiN in the TiO 2 -C-N 2 system. 20) Hu et al 21) study the weight loss rate of the reaction between titanium-containing slag and graphite powder respectively using N 2 and Ar as protective gas through thermal analysis.…”

Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 92%

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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In COREX process, the top gas recycling (TGR) is an effective recovery and utilization technology for the high-quality gas by-produced from the melter gasifier, which can reduce its fuel consumption and emissions, and is of great significance to low carbon ironmaking. However, low concentration N 2 is contained in the top gas, it is unfavorable to the smelting of V-Ti bearing burden because the high temperature solid solution Ti(C, N) is formed in the semi-coke bed and deteriorates the burden permeability of the melter gasifier. The effect of N 2 concentration (0-10 vol%) on the softening, melting and dropping behavior of V-Ti bearing burden is investigated under simulated COREX conditions. Results show that the increasing N 2 concentration will promote the formation of Ti(C, N), increase the slag viscosity and its wettability to coke, greatly increase the burden dropping temperature, which reduces the slag dropping rate from 68.2% to 18.8%. In addition, slag foaming is caused and the gas permeability of V-Ti bearing burden is deteriorated. The vanadium contents of dropping iron and residual iron are decreased from 0.051 wt% and 0.166 wt% to 0.043 wt% and 0.161 wt%, when the N 2 concentration in reducing gas changes from 0 vol% to 10 vol%. If the pressure drop needs to be controlled below 20 kPa, the N 2 concentration in the reducing gas should not exceed 5 vol%, that is, the top gas injection volume should be less than 60%.

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Section: Effect Of Top Gas Recycling Technology On the Softening Melt...mentioning

confidence: 92%

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

et al. 2022

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“…The melting-dropping properties of the charge directly determine the permeability of the blast furnace, thus affecting the fuel consumption and smelting efficiency in the blast furnace. [111][112][113] Therefore, the investigation of the effect of iron coke on the melting-dropping properties of the charge can provide a theoretical basis for the actual use of iron coke in the blast furnace. The melting-dropping properties of the charge mainly include softening property, melting property, dropping property, permeability, etc.…”

Section: Melting-dropping Properties Of the Chargementioning

confidence: 99%

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

Wang

Bao

et al. 2023

steel research int.

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Iron coke has emerged as a promising raw material for low‐carbon ironmaking. However, the structure and properties of iron coke are still obstacles to practical application in blast furnaces, especially the strength of iron coke. Herein, investigations on the preparation and properties of iron coke are reviewed and an integrated system for the performance optimization and efficient utilization of iron coke is proposed. First, the characteristics of different preparation processes for iron coke are compared; then the advantages and limitations of the three processes are summarized. Afterward, the evolution mechanism of iron coke strength and the catalytic mechanism of Fe on the gasification reaction of iron coke are explored in depth. In addition, the coupling mechanism of iron coke gasification and iron ore reduction is analyzed and discussed. The influence of iron coke on the melting–dropping properties of blast furnace charge and the mathematical simulation of using iron coke in the blast furnace are analyzed and summarized. Finally, a comprehensive strategy for the performance optimization of iron coke and its efficient application in the blast furnace is proposed, in which the sequence slicing 3D reconstruction method is applied to analyze the relationship between microstructure and performance of iron coke.

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A Study on the Potential of Carbon Dioxide Utilization Through its Co‐Injection with Hydrogen into the Blast Furnace Tuyeres

Shatokha

2023

steel research int.

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The potential of CO2 utilization through its injection into blast furnace tuyeres is studied using the 1D steady‐state zonal model. Scenarios with the injection of CO2, hydrogen, and their co‐injection at various H2/CO2 mass ratios are analyzed. The impacts on factors affecting vertical temperature patterns and the position of the cohesive zone in the blast furnace are identified. A lifecycle assessment (LCA) for several scenarios with various carbon emissions intensities of hydrogen production, carbon capture, and grid electricity generation is performed. Injection of CO2 without the addition of hydrogen increases the coke rate, reduces productivity, and increases direct CO2 emissions; however, thanks to producing top gas with higher calorific value, injection of CO2 may reduce the global warming potential (GWP) if the electric grid carbon intensity is above 654 kg‐CO2/kWh while carbon capture is powered by green electricity. Although the injection of hydrogen alone would result in a more substantial reduction of GWP from the baseline than the injection of H2/CO2 mix at any mass ratio, considering the identified impacts on heat exchange and the position of the cohesive zone in the blast furnace, co‐injection might be an enabling solution for the adoption of hydrogen injection.This article is protected by copyright. All rights reserved.

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The Effect of Abandoned Basic Oxygen Furnace Gas Blowing on the Softening–Melting–Dripping Performance of Full High Cr‐Bearing Vanadia–Titania Magnetite Pellets

Cited by 10 publications

References 21 publications

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Effect of Top Gas Recycling Technology on the Softening, Melting and Dropping Behavior of V–Ti Bearing Burden in COREX Process

Performance Optimization and Efficient Application of Highly Reactive Iron Coke: Research Progress and Future Trend

A Study on the Potential of Carbon Dioxide Utilization Through its Co‐Injection with Hydrogen into the Blast Furnace Tuyeres

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