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The effects of lance height and bottom blown flowrate on the mixed time,the splashing amount,the penetrating depth,and the level fluctuation of an 85 t combined blown converter have been studied using a water model.The results show that the maximal stirring energy is provided to the bath at the top lance height of about 50-100 mm.When the top lance height is in the range of 90- 110 mm,the splashing amount caused by the top jet can reach the maximal value.The appropriate operational parameters of Chongqing Iron and Steel Company(CISC)converter have been established that the top lance height is 1600-1760 mm and the bot- tom blowing flowrate is 240-480 Nm~3/h in the primary phase of a heat,1100-1300 mm and 160-200 Nm~3/h in the second phase,and 1040-1120 mm and 200-350 Nm~3/h in the end phase.Also,the trial shows that the metallurgical result of the studied blow pattern is better than that of the former pattern.At the starting 3-4 min of a heat,the strong splashing is eliminated.
The effects of lance height and bottom blown flowrate on the mixed time, the splashing amount, the penetration depth, and the level fluctuation of an 85 t combined blown converter have been studied using a water model. Results show that the maximal stirring energy is provided to the bath at the top lance height of about 50-100 mm. When the top lance height is in the range of 90-110 mm, the splashing amount caused by the top jet can reach the maximal value. The appropriate operational parameters of Chongqing Iron and Steel Company (CISC) converter have been established that the top lance height is 1600-1760 mm and the bot- tom flowrate is 240-480 Nm ~ 3 / h in the primary phase of a heat, 1100-1300 mm and 160-200 Nm ~ 3 / h in the second phase, and 1040-1120 mm and 200-350 Nm ~ 3 / h in the end phase. Also, the trial shows that the metallurgical result of the exploded blow pattern is better than that of the former pattern. At the starting 3-4 min of a heat, the strong splashing is eliminated.