Zhang Xiaolong,Feng Lianghua.Effects of Furnace Atmosphere on Supersonic Jet Characteristics of a Five-Nozzle Oxygen Lance in a 200-ton Converter[J].Special Steel,2026,47(02):32-40.
Zhang Xiaolong,Feng Lianghua.Effects of Furnace Atmosphere on Supersonic Jet Characteristics of a Five-Nozzle Oxygen Lance in a 200-ton Converter[J].Special Steel,2026,47(02):32-40. DOI: 10.20057/j.1003-8620.2025-00159.
Effects of Furnace Atmosphere on Supersonic Jet Characteristics of a Five-Nozzle Oxygen Lance in a 200-ton Converter
To address the issue that high temperatures and significant furnace gas variations during converter steelmaking substantially affect the characteristics of supersonic oxygen jets, while research on the changing patterns of jet characteristics across different smelting stages remains limited, the effect of furnace gas composition on supersonic oxygen jet characteristics in converter steelmaking under different temperatures was investigated through CFD numerical simulation.The results indicate that at the same furnace gas concentration, the core length of the oxygen lance jet at high temperature (1 873 K) is 2.6 times longer than at room temperature (298 K). The length of supersonic zone increases linearly with rising CO concentration in the furnace gas, with a more pronounced growth rate at elevated temperatures. A 20% increase in CO concentration extends the core length by 0.048 m at room temperature and by 0.126 m at high temperature. The increase of CO concentration enlarges the effective impact area of the oxygen jet, with a maximum increase of 11.6% at room temperature and 3.1% at high temperature. At room temperature, the effective impact area initially increases and then decreases as the lance height rises, whereas it continues to expand under high-temperature conditions. During the mid-blowing stage, higher CO concentration and ambient temperature contribute more effectively to slowing jet attenuation and expanding the effective impact area.
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