| Polymerization jet oxygen lance is adding accompony protection around the supersonic oxygen lance hole,in order to reduce the entrainment of ambient gas by the main oxygen jet, ensuring the main oxygen impact steel molten pool with strong speed and rigidity. Although there are a lot of experts and scholars at home and abroad on polymerization of jet flow field and its application in electric furnace end of the paper, but the basic structure of porous polymer jet oxygen gun and its application in converter research is less. This topic research with numerical model method gas properties, accompony the structure parameters, oxygen publish or perish on the polymerization of jet flow field and its interaction with steel molten pool effect rule, to improve the oxygen lance structure design and jet oxygen blowing parameters and realize polymerization jet oxygen gun in the application of converter has great significance.In this paper, 120 t converter is the target furnace type that based on the principle of the design of supersonic nozzle to determine the oxygen nozzle structure parameters. In addition, there are some ring accompanying holes to simulate analyze the single jet core zone length,the porous jet cross section and porous jet pumping effect in the condition that have or not oxygen,hydrogen and helium as accompanying gas. And analysising the impact on the polymerization of jet flow field with the changes gas temperature, furnace temperature, the diameter of accompanying holes,and the hole distance with the main oxygen hole,in order to achieve the optimization of porous polymer jet oxygen lance design.To establish the mathematical model of gas-liquid two-phase flow in BOF, simulation analysis of the impact depth and gas-liquid two-phase velocity and spray droplet law of the impact of the porous jet impingement on the molten pool.Through the above research, the following conclusions are drawn:(1) The length of the core section of the single jet of the supersonic oxygen lance is 0.63 m, and the length of the core section of the jet oxygen lance can reach 1.52 m. With the protective gas, the length of the core area of the main oxygen jet increases significantly.(2) With the accompanying gas is oxygen, helium and hydrogen,the length of the core section of the single jet is 0.63 m, 1.28 m and 1.37 m respectively.With the decrease of the protective gas density, the length of the core region of the single jet flow is decreased, and the offset of the central line of the jet stream is decreased.(3) With the accompanying gas temperature is 300 K, 1500 K, 2500 K, the length of the single jet core section is 1.28 m, 1.41 m, 1.52 m respectively. And with the ambient temperature is 300 K, 1073 k, 1873 K, the length of the single jet core is 0.96 m, 121 m, 1.37 m respectively.As the increase of the accompanying flow temperature and the ambient temperature,the length of core section of and jet flow of coherent jet flows had good quality.(4) The effect of the hole diameter and the hole location on the aggregate jet follows the same law.With the decreasing of pore size and spacing, the smaller the jet stream pumping effect and the volume absorption between the main oxygen jet and the surrounding gas, the better protection of protective gas on the main stream of oxygen.(5) Three kinds of gun position, the maximum speed of liquid steel flow in the 0.5m/s.In the bottom of the furnace and the bottom edge is easy to form the "dead zone", which is not conducive to the smelting of steel liquid.The droplet splashing on the furnace wall erosion pressure is about 10 Pa when the gun position at 1m.But the molten steel flow to scour the furnace wall pressure is about 5pa, splash damage to the furnace wall is relatively large. |
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