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<p>This study established three-dimensional gas-phase flow combustion models for oxygen blast furnaces (OBF) and traditional blast furnaces (TBF) along with a water-cooled heat transfer stress model for the tuyere. The combustion processes of reducing gas and pulverized coal, and their effects on the tuyere’s temperature and stress fields, were analyzed. Compared to TBF, results show that ambient temperature oxygen injection in an OBF significantly increases the average temperature of the raceway by 1005&#xa0;K and creates symmetric high-temperature zones at the tuyere outlet. This injection generates substantial heat, promoting coal heating and decomposition, and increases oxygen concentration around coal particles, enhancing burnout rates by 32.45%, especially for medium-sized particles. Additionally, the low-temperature oxygen cools the tuyere interior surface. In contrast, the diffusion of oxygen to the outer layers and its reaction with the hot reducing gas heats the interior surface. The combined effects create a large temperature gradient, resulting in thermal stress of up to 341&#xa0;MPa on the tuyere interior surface. This thermal stress increases the front stress by 80&#xa0;MPa compared to TBF, which may reduce the lifespan of the tuyere because of the enhanced thermal stress and material fatigue.</p>

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Effect of Ambient Temperature Oxygen Injection on Combustion Performance, Temperature Field and Stress Field in Oxygen Blast Furnace Tuyeres

  • 期刊论文

  • 发表日期：

    2025年1月6日

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  • Likun Zhang,
  • Xing Peng,
  • Wenquan Niu,
  • Guang Wang,
  • Jingsong Wang,
  • Haibin Zuo,
  • Xuefeng She,
  • Qingguo Xue

摘要

This study established three-dimensional gas-phase flow combustion models for oxygen blast furnaces (OBF) and traditional blast furnaces (TBF) along with a water-cooled heat transfer stress model for the tuyere. The combustion processes of reducing gas and pulverized coal, and their effects on the tuyere’s temperature and stress fields, were analyzed. Compared to TBF, results show that ambient temperature oxygen injection in an OBF significantly increases the average temperature of the raceway by 1005 K and creates symmetric high-temperature zones at the tuyere outlet. This injection generates substantial heat, promoting coal heating and decomposition, and increases oxygen concentration around coal particles, enhancing burnout rates by 32.45%, especially for medium-sized particles. Additionally, the low-temperature oxygen cools the tuyere interior surface. In contrast, the diffusion of oxygen to the outer layers and its reaction with the hot reducing gas heats the interior surface. The combined effects create a large temperature gradient, resulting in thermal stress of up to 341 MPa on the tuyere interior surface. This thermal stress increases the front stress by 80 MPa compared to TBF, which may reduce the lifespan of the tuyere because of the enhanced thermal stress and material fatigue.