120t精炼钢包底吹氩物理模拟

Physical Modeling for Bottom Blowing Argon in 120 t Ladle

以120t精炼钢包为原型,利用相似原理建立了钢包的物理模拟系统,模拟钢包底吹氩工艺.通过测定不同的底吹条件对钢包混匀时间的影响,确定120t钢包底部透气砖位置和底吹工艺.研究发现,采用5#,6#位置的单透气砖或1#5#,2#6#位置的双透气砖进行钢包底吹氩,均有利于缩短钢包的混匀时间.底吹气量小于0.30Nm3/h时,最佳位置的6#单透气砖的混匀时间比最佳位置的2#6#双透气砖的短,而底吹气量大于0.30Nm3/h后,这两个位置的单透气砖和双透气砖的混匀时间很接近.喷吹夹角小的双透气砖比夹角大的双透气砖搅拌钢液的效果好,靠近钢包壁布置透气砖不利于底吹气体搅拌钢液.对于2#6#双透气砖供气,在D1方向的A,B,C3个位置喂线有利于获得短的混匀时间.

A physical modeling system was set up from the similarity theory for the bottom blowing argon process in a 120 t ladle.The influences of different bottom blowing conditions on the complete mixing time in the ladle were studied.The plug positions and bottom blowing parameters were determined.It was found that position of 5# or 6# with single plug blowing and position of 1#5# or 2#6# for with double-plug blowing were favorable to stirring and mixing in the ladle.The complete mixing time with single plug 6# was shorter than that with double-plug 2#6# at the bottom gas flow rate lower than 0.30 Nm3/h,while at the bottom gas flow rate larger than 0.30 Nm3/h their mixing times were almost the same.The effect of stirring with double plugs at small angle was better than that at large angle in the ladle.Plug locations near the ladle wall were not favorable to molten steel stirring with bottom blowing gas.For the 2#6# double-plug blowing,wire feeding at points A,B,or C along the direction of D1 could result in short mixing time.