Abstract: The effect of top lance level and bottom blowing flowrate on mixed time in bath,mouth spraying,penetration depth in steel and liquid surface fluctuation have been studied by 1:8 water modelling of a 85 t top-bottom combined blown converter at Chongqing Steel. The test results showed that maximum stirring energy was obtained as the top lance level was at 50～100 mm and the spraying amount caused by top lance jet penetration was up to maximum as the top lance level was at 90~110 mm.The top-bottom blown parameters for the 85 t converter at Chongqing Steel has been established that in primary phase of melting the top lance level is 1600~1760 mm and the bottom blowing flowrate is 240~350 m³/h; in second phase both parameters are 1100~1300 mm and 160~200 m³/h respectively; and in later phase both are 1040 ~ 1120 mm and 200～350 m³/h.

Key words: Top-Bottom Combined Blown Converter, Water Modelling, Mixed Time, Spraying Amount, Liquid Surface Fluctuation

摘要： 通过重钢85 t复吹转炉1∶8的水模型,试验研究了顶枪枪位、底吹流量对转炉熔池混匀时间、炉口喷溅量、冲击深度和液面扰动的影响。实验表明,模型获得最大搅拌能的顶枪枪位为50~100 mm;枪位在90~110 mm时,由射流冲击引起的物理喷溅量达到最大值。建立了重钢85 t转炉复吹工艺参数:冶炼前期顶枪枪位为1600~1760 mm,底吹流量240~350 m³/h;中期两参数分别为1100~1300 mm和160~200 m³/h,后期两参数分别为1040~1120 mm和200~350 m³/h。

关键词: 复吹转炉, 水模型, 混匀时期, 喷溅量, 液面扰动