Flow behavior of liquid steel in five-strand tundish
Taking the five-strand tundish of a steel mill as the research object,the physical model of tundish of 1∶2.5 is established.The effects of different insertion depth of nozzle,liquid steel level height,and blocking one strand on the behavior of liquid steel in tundish were investigated by through water simulation physical experiments.At the same time,a reasonable analysis of inclusions in the case of blocking and non-blocking is carried out.The results show that increasing the insertion depth of nozzle can increase the retention time of internal fluid and reduce the dead zone volume.When the insertion depth of nozzle exceeds 94 mm,the fluctuation of the residence time of each flow is small,and the dead zone volume of the second and third flow is stable.In addition,with the increase of steel liquid level,the dead zone volume of the first and third strand changes greatly,and the average dead zone volume of the outlet both increases first and then decreases.When the liquid steel level height is 314 mm or 333 mm,the residence time is longer and the dead zone volume is smaller.When the outlet is not blocked,the average dead zone volume at the outlet is 17.6%;when the second strand is blocked,the average dead zone volume increases to 23.15%,but the removal rate of inclusions is increased,especially for 20 μm inclusions,the removal rate is increased by 12.4%.For comprehensive consideration,it is suggested that the liquid steel level height in actual production should be 80%-85%of the height of the tundish,and the actual insertion depth of nozzle should be about 234 mm.In addition,if there is insufficient supply of liquid steel,difficulties in billet production and other phenomena and it is necessary to block one-strand operation,it is recommended to block the second strand in order to maintain the original flow characteristics of the liquid steel in the tundish.
tundishinsertion depthliquid steel level heightinclusiondead zone volume
万方数据
维普
