Injection of COREX off-gas into ironmaking blast furnace

Liu, Lingling; Kuang, Shibo; Guo, Bin; Yu, Aibing

doi:10.1016/j.fuel.2022.126688

Cited by 10 publications

(1 citation statement)

References 54 publications

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“…[6] Therefore, the development of low-carbon ironmaking technology and the promotion of carbon emission reduction in the blast furnace ironmaking process are the necessary path to achieve green and lowcarbon development for iron and steel enterprises, as well as an important measure to achieve the national goal of carbon peaking and carbon neutrality. [7,8] Currently, the main technologies [9][10][11][12][13][14][15][16][17][18][19][20][21] for low-carbon ironmaking include the use of highly reactive iron coke, biomass fuel injection, hydrogen-rich carbon cycle in blast furnace, hydrogen metallurgy, oxygen blast furnaces, and carbon capture and SEQUESTration. Among them, the use of highly reactive iron coke in blast furnaces is highly adaptable to the current long process of ironmaking and has a good technical economy.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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Impact of Hydrogenous Gas Injection on the Blast Furnace Process: A Numerical Investigation

Mauret

Baniasadi

Saxén

et al. 2023

Metall Mater Trans B

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Intensifying hydrogen use in the blast furnace is a key technology for significant coke and CO2 emissions reductions. The most straightforward approach is the implementation of high hydrogenous gas injection rates in the BF tuyeres. Yet this solution has not been widely implemented due to a lack of understanding of the impact on the furnace’s internal state. In this paper, a newly developed BF mathematical model is presented and validated on operation data. The model is next applied to investigate the effect of hydrogenous gas injection on the overall performance and internal state of the furnace. The current state of an industrial BF is used as a starting point, increasing the injection of coke oven gas, natural gas or pure H2 to the maximum where the limits for a safe and stable process are still obeyed. All three gases were found capable of significantly decreasing the coke rate, but only coke oven gas and pure H2 allowed for a significant reduction of the CO2 emissions. It was found that the indirect reduction of H2 is intensified by hydrogen enrichment partially at the expense of indirect reduction by CO. Furthermore, the water gas shift reaction is intensified at increased hydrogenous gas injection, affecting the CO and H2 utilization of the top gas. The study gives an insight into the feasibility of BF processes with high hydrogenous gases injection into the tuyeres and the resulting coke savings.

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