关键词: 钢包, 电磁搅拌, 气泡分布, 气泡长大, 混匀

Abstract: The Euler-Lagrange method was used for numerical modeling of the 150 t LF ladle, and the Kuo drag force model affected by the bubble shape was used. This method considered the influence of static pressure on bubble size. The argon inlet was at the bottom of the ladle and a rotating electromagnetic stirrer was at R/2 at the bottom of the ladle. The bubble behavior and the mixing time of the alloy were investigated. The results show that the electromagnetic stirrer placed eccentrically at the bottom can effectively change the bubble distribution state. In the range of 0-400 A, the greater the current intensity of the electromagnetic stirrer, the greater the degree of bubble deviation and the greater the degree of bubble dispersion. After applying the eccentric electromagnetic stirring at the bottom, the average residence time of 1 mm bubbles can be extended to 4.38 s, and the residence time of large bubbles such as 20 mm, 30 mm and 40 mm can also be extended by about 60 %. When the current intensity is 400 A, this electromagnetic stirrer can effectively improve the problem of lower temperature of molten steel at the bottom of the ladle and higher temperature around the center. When the current increases to 400 A, the alloy diffusion efficiency is increased by 60.4 %, and the mixing time of molten steel can be shortened by 145 s.

Key words: ladle, electromagnetic stirring, bubble distribution, bubble growth, mixing