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| Numerical simulation of high Mach number oxygen lance under high oxygen pressure |
| ZHANG Yan-chao1，2， ZHANG Cai-jun1，2， ZHU Li-guang1，2， ZHOU Quan-lin1，2 |
| （1. College of Metallurgy and Energy， North China University of Science and Technology， Tangshan 063000， Hebei，China； 2. Hebei Engineering Research Center of High Quality Steel Continuous Casting， Tangshan 063000， Hebei，China） |
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Abstract Based on the 100 t converter in a steel plant in the north， a three-dimensional mathematical model of the flow field in the top-blown converter was established using Fluent software to study the dependence of oxygen jets with different high Mach numbers and the velocity distribution of the molten steel in the molten pool. The study found that the high Mach number oxygen lance has a stable curve at Ma＝2.0～2.3， at which the pressure of the supplied oxygen is most optimal. With the rising of the oxygen supply pressure， the maximum velocity of the oxygen jet， the impact diameter and the impact depth of the molten steel surface also increase. The simulation results show that the oxygen jet has the weakest mutual interference between jets under the designed operating oxygen pressure of 1.0 MPa. The oxygen jet has a smaller increase in the impact diameter and the impact depth after the design oxygen pressure is greater than 1.0 MPa. Based on the above research， after the application of the high Mach number oxygen lance in the actual production， combined with the variable gun position and the variable pressure， the molten steel flow at the bottom of the molten pool can be improved， and the converter blowing process can be stabilized， and the slag splash can be controlled.
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Received: 13 August 2018
Published: 09 May 2019
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2019, Vol. 54 
