Study on the effects of oxygen enrichment modes on the tuyere raceway states of blast furnace

Zheng Kui; Zhao Peng; Hu Peng; Huang Yun; Zhang Jianliang; Xu Runsheng

doi:10.7513/j.issn.1004-7638.2024.06.015

Volume 45 Issue 6

Dec. 2024

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Zheng Kui, Zhao Peng, Hu Peng, Huang Yun, Zhang Jianliang, Xu Runsheng. Study on the effects of oxygen enrichment modes on the tuyere raceway states of blast furnace[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 108-118. doi: 10.7513/j.issn.1004-7638.2024.06.015

Citation:

Zheng Kui, Zhao Peng, Hu Peng, Huang Yun, Zhang Jianliang, Xu Runsheng. Study on the effects of oxygen enrichment modes on the tuyere raceway states of blast furnace[J]. IRON STEEL VANADIUM TITANIUM, 2024, 45(6): 108-118. doi: 10.7513/j.issn.1004-7638.2024.06.015

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Study on the effects of oxygen enrichment modes on the tuyere raceway states of blast furnace

doi: 10.7513/j.issn.1004-7638.2024.06.015

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
2.
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
3.
Xichang Steel and Vanadium Co., Ltd., Pangang Group, Xichang 610053, Sichuan, China

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Received Date: 2024-01-04
Available Online: 2024-12-30
Publish Date: 2024-12-30

Abstract

Abstract

In this paper, based on the actual dimension of the vanadium titanomagnetite blast furnace of a domestic enterprise, a three-dimensional physical model is established. The numerical simulation method is used to compare and study the flow and combustion behavior of pulverized coal in the tuyere gyration area under different oxygen enrichment methods. The results show that the overall trend of the tuyere velocity change with the oxygen enrichment rates is consistent with that of the constant air enrichment mode, but the difference in the change amplitude is significant. That is, when the oxygen enrichment rate is increased by 1%, the cross-sectional velocity of the tuyere is increased by 4.25 m/s (fixed air) and 0.41 m/s (reduced air), respectively. Under the two oxygen enrichment modes, the temperature, reducing gas content and burnout rate of the pulverized coal in the gyratory area have the same trend with the oxygen enrichment rates. As temperature increases, the high temperature area expands with the increase in the reducing gas content, and the burnout rate of pulverized coal increases. Among them, the amount of N₂ brought into the blast furnace decreases due to the decrease in hot air flow rate, and the content of CO and H₂ in the coal gas changes greatly, preventing the formation of carbon nitrides and titanium carbides, and improving the reduction effect of iron ore in the blast furnace. It is calculated that the average temperature of the gyratory zone is increased by 34.22 K (fixed air) and 32.88 K (reduced air) for every 1% increase in the oxygen enrichment rate. Under the condition of reduced air and oxygen enrichment, the N₂ content brought into the blast furnace is reduced by 10 m³/min and the CO concentration in the gas is increased by 8.61%.
- blast furnace,
- oxygen-enriching mode,
- raceway status,
- CFD numerical simulation

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References

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