Effect of Main Gas Composition on Flow Field Characteristics of Supersonic Coherent Jets with CO<sub>2</sub> and O<sub>2</sub> Mixed Injection (COMI) at Steelmaking Temperature

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  • Wei Guangsheng
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing
  • Zhu Rong
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing
  • Cheng Ting
    State Key Laboratory of Powder Metallugy, Central South University
  • Dong Kai
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing
  • Yang Lingzhi
    School of Minerals Processing and Bioengineering, Central South University
  • Tang Tianping
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
  • Wu Xuetao
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing

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Description

<p>As an efficient oxygen supplying technology, coherent jets are widely applied in electric arc furnace (EAF) steelmaking processes to strengthen chemical energy input, speed up smelting rhythm and promote the uniformity of molten bath temperature and compositions. Recently, the supersonic coherent jets with CO2 and O2 mixed injection (COMI) was proposed and through industrial experiments, it can be found that the supersonic coherent jets with COMI showed remarkable advantages in reducing the dust production during EAF steelmaking. In this study, based on the eddy dissipation concept (EDC) model with the detailed chemical kinetic mechanisms (GRI-Mech 3.0), a computational fluid dynamics (CFD) model of supersonic coherent jets with COMI was built. Compared with one-step combustion reaction, GRI-Mech 3.0 consists of 325 elementary reactions with 53 components and can predict more accurate results. The numerical simulation results were validated by the combustion experiment data. The jet behavior and the fluid flow characteristics of supersonic coherent jets with COMI at steelmaking temperature 1700 K was studied and the results show that the chemical effect of CO2 significantly weakens the shrouding combustion reactions of CH4 and the relative importance of the chemical effect of CO2 increases with CO2 concentration increasing. The potential core length of supersonic coherent jets decreases with the volume fraction of CO2 increasing. Moreover, it also can be found that the potential core length of supersonic coherent jets can be prolonged with higher ambient temperature.</p>

Journal

  • ISIJ International

    ISIJ International 58 (5), 842-851, 2018-05-15

    The Iron and Steel Institute of Japan

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