Numerical Simulation Of Multiphase Flow In Electromagnetic Stirring Ladle

As a widely used secondary refining process and an important tool, LF has become a key link of optimization improvements and the focus of attention in the steel smelting process. The technical merits of the LF is of great significance to improve efficiency of LF operations, reduce the time of deep desulphurization, optimize the process of between converter and continuous casting, and keep the compact of the procedures.According to the refining techniques of LF,150t LF ladle as an object, a mathematical model to simulate the multiphase flow in bottom blowing ladle with magnetic stirring is developed. The circulation flow and mixing behavior of molten steel in the process has studied comprehensively and systematically. It mainly considers the effect of some factors such as the bottom blowing nozzle position, the gas injection flow rate and the magnitude of magnetic flux density, on the multiphase flow in the ladle.The Euler-Lagrange multiphase flow model is used in the model. The calculation results show that magnetic field can increase the residence time of argon in the ladle and it also can shorten the mixing time. The rotational flow field can make bubbles to be broken up more easily. The greater the magnetic flux density is, mixing is the more easily. Without electromagnetic stirring, the greater the gas flow rate is, the shorter the mixing time is, and it needs more time to form a stable slag eye. For the eccentric bottom blowing, when the injection gas flow rate is the same, the greater the magnetic flux density is, the larger the slag eye is and the shorter the mixing time is. When magnetic flux density is too small, the steel flow caused by magnetic field is weakened by that caused by gas injection and this tends to make the flow field more close to the flow field without magnetic field. With the same magnetic flux density and the gas flow rate, the mixing time in centric bottom blowing process is shorter than that of in the eccentric bottom blowing process, and both have the same mixing effect. For center bottom blowing process, the greater the magnetic flux density is, it will take the bubbles more time to escape the ladle. For the eccentric bottom blowing, while the magnetic flux density is in a certain range, the gas residence time will be shortened, but when the magnetic flux density is beyond this range, the gas residence time will increase.