Abstract:To improve RH refining efficiency and shorten refining time, a 1∶4 water model was established based on a 150 t RH vacuum refining device in a steel plant to study the influence of the number of bottom blowing holes and the bottom flow. The results showed that the RH circulating flow rate and mixing time were obviously improved compared with those without bottom blowing. In the case of the same bottom blowing flow, the effect of the singlehole bottom blowing on circulation flow was obviously better than that of the doublehole bottom blowing. For example, when the bottom blowing flow rate was 90 L/min, the circulation flow rate of singlehole bottom blowing was 34% higher than that of nobottom blowing, while that of doublehole bottom blowing was only 13%. When the bottom blowing rate was less than 90 L/min, there was little difference in mixing time between singlehole bottom blowing and doublehole bottom blowing. When the bottom blowing flow rate was greater than 90 L/min, the mixing time was increased in the doublehole bottom blowing condition. It was suggested that singlehole bottom blowing process should be adopted at the production field. If the doublehole bottom blowing process was used, the bottom blowing flow rate should not exceed 90 L/min.