Multiphase Flow Numerical Simulation Of Ladle Bottom Gas Injection Under Electric Field

Due to the needs of social development and economic construction,users are also demanding higher and higher varieties and quality of steel products.In some important fields,the demand for low-sulfur steel products is increasing.The sulfur content has a very important impact in the production process of steel,reducing the sulfur content of the steel for the production of high-quality special steel is very necessary.Therefore,under the action of electric field,the numerical simulation of multiphase flow of desulphurization gas at the bottom of ladle is studied,and the optimal injection parameters are selected to provide the theoretical basis for the actual production and application of hot metal pretreatment bottom jet desulfurization.In this paper,taking a 250 t ladle physical model of a steel mill as the research object,a three-dimensional model of ladle is established by using ICEM software.Then the mesh is partitioned and the mathematical model of continuity equation,energy equation,momentum equation and electric field force control equation are established.The VOF multi-phase flow model is used to simulate the flow between gas-liquid two-phase flow,and the numerical simulation is carried out by using Fluent software.The bottom nozzle of ladle adopts the arrangement of two nozzles with different angles,and the center distance is nine different solutions of 0.4R,0.5R and0.6R respectively.Specific conclusions are as follows:In the absence of an electric field,changing the initial temperature of hot metal ladle has no significant effect on the gas-liquid two-phase flow in hot metal ladle.The optimum hot metal initial temperature is 1350 ?.The effect of flow rate on the flow of gas-liquid two-phase flow in ladle is obviously greater than that of temperature.The best injection flow rate is 500 NL / min.With the voltage of 3200 V,the weak flow area between the two nozzles gradually increases with the increase of the center distance at the bottom of the ladle.With the increase of the angle between the two nozzles,the mixing time after the trend of increase and then decrease.The angle between the two nozzles at the bottom of the ladle is 60 °.When the center distance from the bottom of the ladle is 0.5R,the gas-liquid two-phase flow disturbance in the ladle is more uniform and the mixing time required is the shortest.The best injection position and without the role of electric field has not changed.Compared with no electric field,the flow rate at different monitoring points under the same injection flow rate increased to some extent,and the best injection flow rate is 400 NL / min.With the increase of voltage,the flow rate of different monitoring points also showed a gradual increase trend.When the voltage applied to the ladle is 9600 V,the hot metal at the top of the ladle is barely exposed,and at the same time,the possibility of large ladle slag is avoided.