The Numerical Simulation Research Of The Argon Blowing Process In The Ladle Furnace

Ladle furnace (LF) refining can increase liquid steel's purity to satisfy the continuous casting's requirements for the liquid steel's composition and temperature, and the quality requirements of the special steel, ordinary steel, cast steel etc industrial steel production. Because of its advantage of simple structure, convenient operation, multi-function, less investment etc, LF refining dominates the external equipment of the furnace, has become the main refining method in our country's pure steel production.Blowing argon is the main characteristic of the LF, it's meaningful to study the flow field while blowing argon as well as the physical chemistry reaction happened in the liquid steel, thus, this paper simulates the baogang's 150t'LF to study the shape of the flow field and the process of decarburization by blowing argon. This paper adopts FORTURN language as a self-design procedure tool, photographs are made from TECPLOT software. Using the continuity, N-S equations and the turbulence model to describe the three-dimensional flow;using the SIMPLE method to simulate the velocity distribution in the liquid steel, and then calculate the volume of the weak flow region; to simulate the bubble motion, using Lagrange model to describe the bubble motion and the process of decarburization; using the method of LongGe coulthard in fourth-order to carry out the calculation.Through the analysis of the simulation results, this paper compares the form of the flow field and the volume of the weak flow region under different gas blowing quantity in a given location, makes sure the optimum distribution of gas blowing quantity. This paper calculates the argon bubbles'trajectory, velocity and the process of growing up in the LF, making sure the bubble overflow speed and the bubble diameter at different times; according to the statistics, finding out the changing law of bubble up-floating speed, as well as the rate of bubble growing up. Based on this, we can calculate out the decarburization quantity of different diameters'bubbles, and then comparing their decarburization ability.Based on the best distribution of the blowing quantity gaining from the simulation results, we can optimize the ladle, which is good to the even distribution of temperature, and the removal of inclusions in the bubble. The study of the bubble decarburization ability will be helpful to accurately control the carbon content in the steel, which can increase the quality of the steel, optimize the quality of the steel production.