IR-UT钢包精炼法的模拟实验

STUDIES OF IR-UT LADLE REFINING PROCESS WITH HYDRAULIC MODEL SIMULATION

作者结合３０ｔ钢包实例对ＩＲ－ＵＴ法进行了模拟实验，观察了诸工艺参数对包内流场的影响，讨论分析了满足包内流场保持合理状态所要求的工艺参数，模拟实验结论：对３０ｔ钢包而言，隔离罩内径以Ｉ．Ｄ１１００－１２００ｍｍ，插入深度以浸入钢液２００－３００ｍｍ为好；搅拌枪插入深度为枪嘴距包底２００ｍｍ；升温枪吹氧量约为０．１３－０．２８Ｎｍ＾３／ｓ。

The IR-UT ladle refining process was investigated with the scaled-down hydraulic model and LDA measurement; The influence of some technological parameters, such as snorkel dimensions, stirring lance depth and oxygen flow rate, on the flow patterns in the ladle was examined. Based on experimental data, the optimal parameters for maintaining beneficial flow patterns inside the ladle were determined. By cold model experiments, the following conclusions are obtained: (1) The relevant technological parameters, such as the size and immersion depth of the snorkel, inserting depth of the stirring gun as well as intake of oxygen and argon, should be properly chosen to keep the optimal flow field inside the ladle. For a 30 tons ladle, the diameter of the snorkel ranges from 1100 to 1200mm; its immersion depth ranges from 200 to 300mm;the nozzle of the stirring gun should be kept 200mm above the bottom of the ladle, oxygen flux rallges from 0.13 to 0.28 Nm3/s and.argon flux from 5×10-3 to 9×10-3Nm3/s.(2) In IR─UT ladle refining process, the circulating flow inside the snorkel is in the opposite direction to the circulating flow outside it. And the flow current in the two-phase region is larger than the one outside the snorkel. The turbulent energy also behaves in the same manner.(3) In the commercial production, non-homogeneity of the steel liquid inside the ladle caused by slag cannot be ignored. Therefore, argon flux should be made slightly larger than the one given above. For the same reason ， after the steel is molten, the snorkel should be lift up to allow the steel to be well stirred and mixed.