针对唐钢50 t转炉冶炼条件,采用Fluent软件对氧气射流—钢液两相间相互作用进行了数值模拟研究,分析了变角氧枪作用下熔池内钢液流场、枪位及喷孔倾角对弱搅拌区比率的影响规律,为变角氧枪结构优化提供了理论依据.结果表明:与非变角氧枪相比,变角氧枪作用下钢液流场更均匀;熔池底部存在弱搅拌区,随着枪位的提升,熔池弱搅拌区比率有所增加;除喷头F外,研究的变角氧枪作用下熔池的弱搅拌区比率普遍低于非变角氧枪;在同一枪位下,与对角喷孔倾角相差0.5°相比,对角喷孔倾角相差1°时,熔池内弱搅拌区比率更低;在研究的9个喷头中,喷头D(11°/12°)作用下熔池内弱搅拌区比率最小.
Based on technological conditions of 50 t converter melting at Tangshan Iron &Steel corp.,the numerical simulation of two-phase flow between oxygen gas jet and liquid steel in the bath has been carried out by Fluent software where the flow field of liquid steel in the bath impacted by the oxygen gas jet sprayed by the variable angle oxygen lances and non-variable angle lance,and the influence of lance level and the inclining angle on the proportion of death zones have been analyzed for the purpose of providing theoretical base for optimization of the oxygen lance configuration.It was found that the flow field of the bath impacted by the gas jet sprayed from the variable angle oxygen lance was more homogeneous than that by the non-variable angle oxygen lances.Death zones occurred at the bottom of the molten bath.The proportion of death zones increased with the increase of the lance level.Except for lance F,the proportions of death zones impacted by variable angle oxygen lance were lower than that by non-variable oxygen lance at the same lance level.Compared with the differential value 0.5° between the opposite inclining angle,variable angle oxygen lance with the differential value 1.0° led to lower proportions of death zones in the molten bath Moreover,among the 9 sprayers investigated in this paper,the proportion of death zones impacted by the sprayer D with the inclining angle 11° and 12° is the lowest.
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