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<p>The process of operation of tuyeres with ceramic heat-insulation insert in the blow channel may be accompanied by the gradual destruction of the ceramic, which may lead to changes in the conditions of heat exchange between the tuyere and gases and, hence, to shortening of the service life of the tuyere and elevation of the heat losses with cooling water. As one of the causes of this kind of destruction, we can mention significant changes in the gas-blow parameters, e.g., an increase in the natural-gas (NG) combustion. In this connection, we study the effect of NG combustion on the thermal conditions of the tuyere and its elements. A&#xa0;finite-element model was created by using the Ansys software. The proposed model included the blow channel, the tube for NG supply, and the ceramic insert. As a&#xa0;result of the Ansys simulation, it was shown that mean values of temperature of the gas-blow flow and the insert decrease as the natural gas combustion increase. At the same time, a&#xa0;local increase in these parameters is observed under the gas tube in the direction of blowing, which leads to a&#xa0;decrease in the resistance of the insert. In addition, we also analyze the influence of the inner diameter of the gas tube used for feeding NG into the tuyere blow channel on the gas dynamics and the process of heat exchange in the air tuyere. As the diameter of the tube for NG supply becomes smaller, its stream deeper penetrates into the blow flow and mixes with it more intensely. This increases the efficiency of combustion in the areas of the flow located at larger distances from the insert surface. This decreases the temperature of tuyere elements and, hence, lowers the probability of fracture of these elements. In order to increase the resistance of the insert and improve the heat parameters of blown gases, it is recommended to decrease the gas-tube diameter down to 30 mm.</p>

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Analysis of operation of blast furnaces’ air tuyere with heat insulation insert in the blow channel

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • E. A. Volkov,
  • M. K. Mikhailova,
  • I. A. Levitskiy,
  • A. G. Radyuk,
  • M. M. Skripalenko,
  • V. V. Sukhanovskiy,
  • A. E. Titlyanov

摘要

The process of operation of tuyeres with ceramic heat-insulation insert in the blow channel may be accompanied by the gradual destruction of the ceramic, which may lead to changes in the conditions of heat exchange between the tuyere and gases and, hence, to shortening of the service life of the tuyere and elevation of the heat losses with cooling water. As one of the causes of this kind of destruction, we can mention significant changes in the gas-blow parameters, e.g., an increase in the natural-gas (NG) combustion. In this connection, we study the effect of NG combustion on the thermal conditions of the tuyere and its elements. A finite-element model was created by using the Ansys software. The proposed model included the blow channel, the tube for NG supply, and the ceramic insert. As a result of the Ansys simulation, it was shown that mean values of temperature of the gas-blow flow and the insert decrease as the natural gas combustion increase. At the same time, a local increase in these parameters is observed under the gas tube in the direction of blowing, which leads to a decrease in the resistance of the insert. In addition, we also analyze the influence of the inner diameter of the gas tube used for feeding NG into the tuyere blow channel on the gas dynamics and the process of heat exchange in the air tuyere. As the diameter of the tube for NG supply becomes smaller, its stream deeper penetrates into the blow flow and mixes with it more intensely. This increases the efficiency of combustion in the areas of the flow located at larger distances from the insert surface. This decreases the temperature of tuyere elements and, hence, lowers the probability of fracture of these elements. In order to increase the resistance of the insert and improve the heat parameters of blown gases, it is recommended to decrease the gas-tube diameter down to 30 mm.