1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 2. Hongxing Iron and Steel Co., Ltd., Jiuquan Iron and Steel Group, Jiayuguan 735100, Gansu, China
Abstract：In order to investigate the free jet characteristics of the twist oxygen lance, the free jet geometric models of 0°, 6°, 12° and 18° twist oxygen lances were established. The twist characteristics, jet velocity and dynamic pressure distribution of twist oxygen lances with different twist angles at steelmaking temperature were studied. It was found that the jet velocity and dynamic pressure decay was faster in 6°, 12° and 18° twist oxygen lances compared to 0° twist oxygen lance, and the larger the twist angle, the faster the jet decay. Compared with 12° and 18° twist oxygen lances, the jet velocity and dynamic pressure decayed slowly when 6° twist oxygen lance was used. While ensuring the appropriate impact depth and impact area, the molten bath produced certain rotational motion. Based on this, a geometric model of gas-slag-metal multiphase flow of 6° twist oxygen lance and converter was established. The influence of ambient temperature change on the impact characteristics of 6° twist oxygen lance and the velocity distribution of molten bath was studied. It was found that when the ambient temperature increased from 300 K to 1 873 K, the impact radius increased from 1.25 m to 1.78 m, and the impact depth only increased from 0.119 m to 0.132 m. As the ambient temperature increased, the area of high-speed zone at the molten steel surface increased and the area of dead zone and low-speed zone decreased. In the shallower part of molten bath, the area of dead zone decreased and the area of high-speed zone increased as the ambient temperature increased. Taking the molten bath depth of 0.3 m as an example, the ambient temperature increased from 300 K to 1 873 K, the dead zone area decreased from 0.41 m2 to 0.17 m2 and the high-speed zone increased from 9.35 m2 to 9.76 m2. In the deeper part of molten bath, the bottom-blowing jet played dominant role and the ambient temperature had weaker effect on the molten bath velocity distribution, with smaller difference in the area of different speed zones. The research results can provide theoretical guidance for the industrial application of twist oxygen lance.
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2024, Vol. 34 
