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Flow Characteristic of Supersonic Jet Related to O2–CO2 Mixing Injection Method

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Abstract

The O2–CO2 mixing injection method was proposed to mitigate CO2 emissions and enhance the CO content in flue gas during the BOF steelmaking process. Despite the reported advantages of the O2–CO2 mixing injection method, limited research existed regarding the impact of Laval nozzle structures designed by various CO2 mixing rates on the flow characteristics of supersonic mixing jets. In this research, we investigated four types of Laval nozzle structures designed for varying CO2 mixing rates through a series of experimental tests and numerical simulations. The results indicated that when the CO2 additional flow rate increased from 0 to 15 mass pct, the impaction ability of the mixing jet enhanced. However, this increasing rate was gradually suppressed due to the thermo-physical property variations between O2 and CO2. Under room and high ambient temperature conditions, the average axial velocity variation within the velocity potential core was 1.58 and 1.68 m/(s·mass pct), respectively. To further validate the metallurgical effects, a pilot test was conducted using a 1.0 ton converter with O2 and CO2 blowing rates of 210 and 31.5 Nm3/h, respectively, demonstrating that the Laval nozzle structure designed based on the O2–CO2 mixing gas thermo-physical property could achieve superior metallurgical outcomes.

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Acknowledgments

The authors would like to express their thanks for the support by the National Nature Science Foundation of China (NSFC 52322407, NSFC 52074024 and NSFC 52293392) and National Key R&D Program of China (2020YFC1910002).

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Jiangshun Wu, Fuhai Liu & Rong Zhu

  2. Institute for Carbon Neutrality, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Fuhai Liu, Guangsheng Wei, Kai Dong, Rong Zhu & Chao Feng

  3. Institute of Steel Sustainable Technology, Liaoning Academy of Materials, Shenyang, 110000, P.R. China

    Kai Dong

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  1. Jiangshun Wu
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  2. Fuhai Liu
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  3. Guangsheng Wei
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  4. Kai Dong
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Correspondence to Fuhai Liu or Kai Dong.

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Wu, J., Liu, F., Wei, G. et al. Flow Characteristic of Supersonic Jet Related to O2–CO2 Mixing Injection Method. Metall Mater Trans B (2024). https://doi.org/10.1007/s11663-024-02993-8

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  • DOI: https://doi.org/10.1007/s11663-024-02993-8

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