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Numerical Simulation of Inclusion of LF in Bao Gang

Author: HaoShuai
Tutor: ChenYiSheng
School: Inner Mongolia University of Science and Technology
Course: Iron and steel metallurgy
Keywords: numerical simulation fluid field commix time inclusion trajectory
CLC: TF769.2
Type: Master's thesis
Year: 2010
Downloads: 110
Quote: 0
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Abstract


The new 150t LF refining furnace of Baotou Steel Factory is looked as research object in the paper. According to actual refining process and furnace work requirements, it is discussed and researched that are the position of blowing argon holes, the different argon blowing quantity, the commix time of deoxidizer and the motive form of the inclusion in steel molten steel to provide the theoretical support for the actual production.The paper combined water models and mathematical models. It carried on numerical simulation to the flow field, which applied continuity equation, Navier-Stokes equation and turbulence models. Then it calculated the commix time of deoxidizing agent in the molten steel on the basis of flow field, which applied concentration distributed diffusion equation. Thirdly, the particle trajectory model has been coupled to calculate the retention time and the trajectory of 9 particles at different initial position in molten steel, and then statistical methods were introduced to complement the removal of the particles. The calculating procedure was written by FORTRAN language and the TECPLOT software was as post-processing tool.Though analysis and comparison results of numerical simulation and experimental result, it gets as follows: when it is blowing from the double-hole, it obtained that the momentum at the bottom has changed better and flowed actively with the increasing center distance of two holes and the smaller angle between the two holes; Besides, it get that the blowing volume has a critical value through water model experiment, and when the value is greater than the critical value, the commix time will change gently; The commix time of deoxidizing agent is about 300s in molten steel. In addition, by calculating different size particles trajectories of inclusion obtained as following: the removal time is different in the different position in the process of remove the inclusion. And the inclusion is removed very difficultly at an opposite position of double-hole when is in the flow field of symmetrical double-hole. And then the inclusion trajectory approximate two-dimension motion in the eddy.It is concluded that some specific operating parameters in actual production process in the study and provided some theoretical support and reference value for actual production.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Liquid steel in secondary refining and furnace processing > Ladle refining furnace
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