Numerical simulation of the effect of hydrogen injection and oxygen enrichment interaction on PCI in a blast furnace

Abstract

Hydrogen displays the potential to partially replace pulverized coal injection (PCI) in the blast furnace, and it can reduce CO₂ emissions. In this paper, a three-dimensional mathematical model of hydrogen and pulverized coal co-injection in blast furnace tuyere was established through numerical simulation, and the effect of hydrogen injection and oxygen enrichment interaction on pulverized coal combustion and raceway smelting was investigated. The simulation results indicate that when the coal injection rate decreased from 36 to 30 t/h and the hydrogen injection increased from 0 to 3600 m³/h, the CO₂ emissions decreased from 1860 to 1551 kg/t, which represents a 16.6% reduction, and the pulverized coal burnout decreased from 70.1% to 63.7%. The heat released from hydrogen combustion can not only promote the volatilization of pulverized coal but also affect the combustion reaction between volatilization and oxygen, which resulted in a decrease in the temperature at the end of the raceway. Co-injection of hydrogen with PCI increased the wall temperature near the upper half part of the raceway and at the outlet of the tuyere, which required a high cooling efficiency to extend the service life of the blast furnace. The increase in oxygen level compensated for the decreased average temperature in the raceway due to hydrogen injection. The increase in the oxygen content by 3% while maintaining constant hydrogen and PCI injection rates increased the burnout and average raceway temperature by 4.2% and 43 K, respectively. The mole fraction of CO and H₂ production increased by 0.04 and 0.02, respectively. Burnout can be improved through optimization of the particle size distribution of pulverized coal.

Keywords

blast furnace / hydrogen / pulverized coal injection / burnout / numerical simulation

References

[1] ShatokhaV. Modeling of the effect of hydrogen injection on blast furnace operation and carbon dioxide emissions. Int. J. Miner. Metall. Mater., 2022, 29101851.

[2] TangJ, ChuMS, LiF, FengC, LiuZG, ZhouYS. Development and progress on hydrogen metallurgy. Int. J. Miner. Metall. Mater., 2020, 276713.

[3] MauretF, BaniasadiM, SaxénH, FeiternaA, HojdaS. Impact of hydrogenous gas injection on the blast furnace process: A numerical investigation. Metall. Mater. Trans. B, 2023, 5442137.

[4] WangJ, WangW, ChenXH, BaoJF, HaoQY, ZhengH, XuRS. Role of iron ore in enhancing gasification of iron coke: Structural evolution, influence mechanism and kinetic analysis. Int. J. Miner. Metall. Mater., 2025, 32158.

[5] ZhouF, PengDS, LiKJ, ConejoAN, LiaoHT, XiongZX, LiDT, ZhangJL. Coke behavior with H₂O in a hydrogen-enriched blast furnace: A review. Int. J. Miner. Metall. Mater., 2024, 315959.

[6] ShenYS, GuoBY, YuAB, AustinPR, ZulliP. Three-dimensional modelling of in-furnace coal/coke combustion in a blast furnace. Fuel, 2011, 902728.

[7] V. Shatokha, A study on the potential of carbon dioxide utilization through its co-injection with hydrogen into the blast furnace tuyeres, Steel Res. Int., 95(2024), No. 11, art. No. 2300397.

[8] L.L. Liu, S.B. Kuang, B.Y. Guo, and A.B. Yu, Injection of COREX off-gas into ironmaking blast furnace, Fuel, 334(2023), art. No. 126688.

[9] WangZH, ZhangJH, XieCH, GaoLH, HeZJ, ZhanWL. Numerical simulation study of co-injection of pulverized coal and hydrogen in the tuyere-raceway. J. Sustain. Metall., 2024, 1031237.

[10] Y.T. Zhuo, Z.J. Hu, and Y.S. Shen, CFD study of hydrogen injection through tuyeres into ironmaking blast furnaces, Fuel, 302(2021), art. No. 120804.

[11] LiuYR, HuZJ, ShenYS. CFD study of hydrogen injection in blast furnaces: Tuyere co-injection of hydrogen and coal. Metall. Mater. Trans. B, 2021, 5252971.

[12] RenMM, LiuWW, ZhaoJX, et al.. Effects of hydrogen fraction in co-injection gas on combustion characteristics of the raceway in low carbon emission blast furnace. Int. J. Hydrog. Energy, 2023, 483011530.

[13] C.L. Zhang, J.L. Zhang, A.Y. Zheng, R.S. Xu, G.L. Jia, and J.F. Zhu, Effects of hydrogen-rich fuel injection on the states of the raceway in blast furnace, Energy, 274(2023), art. No. 127237.

[14] ZhangJL, ZhangCL, XuRS, ZhengAY, ZhuJF. Research on the impact of tuyere parameters on the states of hydrogen-rich blast furnace. Int. J. Hydrog. Energy, 2024, 49822.

[15] BarrettN, ZulliP, O’DeaD, MitraS, HoneyandsT. Replacement of pulverised coal injection (PCI) with hydrogen and its impact on blast furnace internal conditions. Iron Ore Conference, 2021

[16] YilmazC, WendelstorfJ, TurekT. Modeling and simulation of hydrogen injection into a blast furnace to reduce carbon dioxide emissions. J. Cleaner. Prod., 2017, 154488.

[17] J.A. de Castro, G.A. de Medeiros, L.M. da Silva, I.L. Ferreira, M.F. de Campos, and E.M. de Oliveira, A numerical study of scenarios for the substitution of pulverized coal injection by blast furnace gas enriched by hydrogen and oxygen aiming at a reduction in CO₂ emissions in the blast furnace process, Metals, 13(2023), No. 5, art. No. 927.

[18] J. Tang, M.S. Chu, F. Li, et al., Mathematical simulation and life cycle assessment of blast furnace operation with hydrogen injection under constant pulverized coal injection, J. Cleaner Prod., 278(2021), art. No. 123191.

[19] BarrettN, MitraS, DoostmohammadiH, et al.. Development of softening and melting testing conditions simulating blast furnace operation with hydrogen injection. Ironmaking Steelmaking, 2023, 5091248.

[20] ChenYB, ZuoHB. Review of hydrogen-rich ironmaking technology in blast furnace. Ironmaking Steelmaking, 2021, 486749.

[21] ShenYS, GuoBY, YuAB, ZulliP. A three-dimensional numerical study of the combustion of coal blends in blast furnace. Fuel, 2009, 882255.

[22] X.B. Yu, Z.J. Hu, and Y.S. Shen, Modeling of hydrogen shaft injection in ironmaking blast furnaces, Fuel, 302(2021), art. No. 121092.

[23] M.J. Gan, Y.R. Liu, and Y.S. Shen, A novel ironmaking decarbonisation technology: Co-injection of hydrogen and biochar (CoHB): A CFD study of combustion in the raceway under simulated blast furnace conditions, Fuel, 350(2023), art. No. 128745.

[24] Y.T. Zhuo and Y.S. Shen, Three-dimensional transient modelling of coal and coke co-combustion in the dynamic raceway of ironmaking blast furnaces, Appl. Energy, 261(2020), art. No. 114456.

[25] C.L. Zhang, L. Vladislav, R.S. Xu, et al., Blast furnace hydrogen-rich metallurgy-research on efficiency injection of natural gas and pulverized coal, Fuel, 311(2022), art. No. 122412.

[26] Q. Wang, E.L. Wang, and O.P. Chionoso, Numerical simulation of the synergistic effect of combustion for the hydrochar/coal blends in a blast furnace, Energy, 238(2022), art. No. 121722.

[27] C.L. Zhang, J.L. Zhang, R.S. Xu, A.Y. Zheng, J.F. Zhu, and T. Li, Numerical investigation of hydrogen-rich gas and pulverized coal injection in the raceway of a blast furnace with lower carbon emissions, Fuel, 356(2024), art. No. 129462.

[28] LyuQ, QieYN, LiuXJ, LanCC, LiJP, LiuS. Effect of hydrogen addition on reduction behavior of iron oxides in gas-injection blast furnace. Thermochim. Acta, 2017, 64879.

[29] MuraoA, KashiharaY, TakahashiK, OyamaN, MatsunoH, SatoM. Effect of natural gas injection into blast furnace on combustion efficiency of pulverized coal. Tetsu-to-Hagane, 2015, 10112653.

[30] BernasowskiM. Theoretical study of the hydrogen influence on iron oxides reduction at the blast furnace process. Steel Res. Int., 2014, 854670.

[31] QieYN, LyuQ, LiuXJ, et al.. Effect of hydrogen addition on softening and melting reduction behaviors of ferrous burden in gas-injection blast furnace. Metall. Mater. Trans. B, 2018, 4952622.

[32] BabichA. Blast furnace injection for minimizing the coke rate and CO₂ emissions. Ironmaking Steelmaking, 2021, 486728.

[33] Z.F. Zhou, R.H. Wang, Q.J. Yi, G. Wang, and C.Y. Ma, Combustion enhancement of pulverized coal with targeted oxygen-enrichment in an ironmaking blast furnace, Processes, 9(2021), No. 3, art. No. 440.

[34] T. Okosun, S. Nielson, J. D’Alessio, S. Ray, S. Street, and C. Zhou, On the impacts of pre-heated natural gas injection in blast furnaces, Processes, 8(2020), No. 7, art. No. 771.

[35] PengX, WangJS, ZuoHB, WangG, XueQG. Numerical analysis of injection of natural gas in an oxygen-enriched blast furnace. The 13th China Iron and Steel Annual Conference, 2022501

[36] L.G. Zhang, D.J. Liu, L. Zhang, H.M. Zhang, Z.F. Fan, and B.K. Liu, Study on influence regularity of BF tuyere diameter and coke particle size on it, Angang Technol., 2006, No. 1, p. 7.

[37] J. Li, S.B. Kuang, L.L. Jiao, L.L. Liu, R.P. Zou, and A.B. Yu, Numerical modeling and analysis of hydrogen blast furnace ironmaking process, Fuel, 323(2022), art. No. 124368.

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