Scholarlink

<p>The supersonic oxygen-carbon mixed injection technology used in modern electric arc furnaces not only reduces impurities like sulfur and phosphorus but also enhances the penetration ability of carbon powder, accelerates the smelting reaction, and shortens the steelmaking cycle. In current work, numerical model has been developed to predict the injection and mixing characteristics of supersonic gas-solid coaxial jets of a lance in EAF <i>via</i> Euler–Lagrangian method. After rigorous experimental validation, this study examined the jet compressibility and particle penetration depth of coaxial jets, together with the impact of nozzle throat and center tube diameters. The main results are as follows: (i) Smaller lance throat diameter concentrates the jet energy, reducing the entrainment of ambient gas by the supersonic annular oxygen jet. This helps maintain the core region of the supersonic jet, thereby increasing penetration depth and improving powder utilization efficiency. (ii) A smaller center tube diameter of the lance enhances the mixing of the annular oxygen jet with the carrier gas, extends the axial length of the jet core region, and improves the acceleration of central carbon powder particles. This enables the particles to achieve higher velocity and greater penetration. (iii) Regarding the phase interaction mechanism, momentum and energy exchange between particles and gas primarily occur within the nozzle and extend downstream, reaching an axial position of <i>x/X</i> = 0.23. Smaller throat and center tube diameters enhance the carrier gas acceleration, effectively increasing the velocity difference and thereby improving heat and momentum exchange between the particles and the carrier gas. The outcomes of this investigation contribute essential knowledge for optimizing and developing advanced supersonic coaxial lances.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigation of Oxygen-Carbon Mixing Dynamics of Co-axial Jets in Supersonic Lance for Electric Arc Furnace

  • 期刊论文

  • 发表日期：

    2025年6月2日

查看全文
  • Kunlin Yang,
  • Shiliang Yang,
  • Wengui Peng,
  • Hua Wang

摘要

The supersonic oxygen-carbon mixed injection technology used in modern electric arc furnaces not only reduces impurities like sulfur and phosphorus but also enhances the penetration ability of carbon powder, accelerates the smelting reaction, and shortens the steelmaking cycle. In current work, numerical model has been developed to predict the injection and mixing characteristics of supersonic gas-solid coaxial jets of a lance in EAF via Euler–Lagrangian method. After rigorous experimental validation, this study examined the jet compressibility and particle penetration depth of coaxial jets, together with the impact of nozzle throat and center tube diameters. The main results are as follows: (i) Smaller lance throat diameter concentrates the jet energy, reducing the entrainment of ambient gas by the supersonic annular oxygen jet. This helps maintain the core region of the supersonic jet, thereby increasing penetration depth and improving powder utilization efficiency. (ii) A smaller center tube diameter of the lance enhances the mixing of the annular oxygen jet with the carrier gas, extends the axial length of the jet core region, and improves the acceleration of central carbon powder particles. This enables the particles to achieve higher velocity and greater penetration. (iii) Regarding the phase interaction mechanism, momentum and energy exchange between particles and gas primarily occur within the nozzle and extend downstream, reaching an axial position of x/X = 0.23. Smaller throat and center tube diameters enhance the carrier gas acceleration, effectively increasing the velocity difference and thereby improving heat and momentum exchange between the particles and the carrier gas. The outcomes of this investigation contribute essential knowledge for optimizing and developing advanced supersonic coaxial lances.