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<p>The gas-solid distributor has a significant effect on the uniformity of powder distribution in the molten bath during the bottom-blowing O<sub>2</sub>–CaO (BBOC) converter process. Herein, a new type of swirling gas-solid distributor (SGSD) was developed based on the BBOC process in a 300 ton converter. The behavior of the gas-solid two-phase flow inside the distributor was simulated using the DDPM-KTGF model. The validation of the mathematical model was verified by the industrial testing. The effects of the characteristic structure of the distributor, the ratio of powder and gas, and the particle size of CaO on the uniformity of the powder distribution were discussed. Results shown that the carrier gas in the SGSD was strongly swirling flow and the velocity field in the distributor was evenly and symmetrically distributed. The average relative deviation of CaO mass flow was 0.69&#xa0;pct for the SGSD with 4 discharge pipes. When the ratio of powder and gas was 5.33&#xa0;kg/m<sup>3</sup> and the particle size range of CaO was 10 to 30 <i>μ</i>m, the relative deviation of CaO mass flow in different pipes was the smallest and had a value of 2.0&#xa0;pct. In addition, the results of the industrial trials shown that after using the SGSD with 4 discharge pipes, the T.Fe content of the slag were reduced by 4.1&#xa0;pct. The consumption of CaO was decreased by 11&#xa0;kg/t and the melting rate of CaO was increased by 76&#xa0;pct. Meanwhile, the erosion wear of the converter bottom was effectively alleviated using the SGSD. The problems of the pipeline blockage, uneven powder-gas distribution, and low dephosphorization efficiency was effectively solved by the developed SGSD in the BBOC steelmaking converter technology.</p>

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Mathematical Simulation and Industrial Implications of Swirling Gas-Solid Distributor in the Bottom-Blowing O2–CaO Steelmaking Converter Process

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Haichen Zhou,
  • Wenliang Dong,
  • Haibo Li,
  • Shunkuan Guan,
  • Changliang Zhao,
  • Chenxi Ji,
  • Guohui Ding,
  • Kai Dong

摘要

The gas-solid distributor has a significant effect on the uniformity of powder distribution in the molten bath during the bottom-blowing O2–CaO (BBOC) converter process. Herein, a new type of swirling gas-solid distributor (SGSD) was developed based on the BBOC process in a 300 ton converter. The behavior of the gas-solid two-phase flow inside the distributor was simulated using the DDPM-KTGF model. The validation of the mathematical model was verified by the industrial testing. The effects of the characteristic structure of the distributor, the ratio of powder and gas, and the particle size of CaO on the uniformity of the powder distribution were discussed. Results shown that the carrier gas in the SGSD was strongly swirling flow and the velocity field in the distributor was evenly and symmetrically distributed. The average relative deviation of CaO mass flow was 0.69 pct for the SGSD with 4 discharge pipes. When the ratio of powder and gas was 5.33 kg/m3 and the particle size range of CaO was 10 to 30 μm, the relative deviation of CaO mass flow in different pipes was the smallest and had a value of 2.0 pct. In addition, the results of the industrial trials shown that after using the SGSD with 4 discharge pipes, the T.Fe content of the slag were reduced by 4.1 pct. The consumption of CaO was decreased by 11 kg/t and the melting rate of CaO was increased by 76 pct. Meanwhile, the erosion wear of the converter bottom was effectively alleviated using the SGSD. The problems of the pipeline blockage, uneven powder-gas distribution, and low dephosphorization efficiency was effectively solved by the developed SGSD in the BBOC steelmaking converter technology.