The current study focus on the effects of volume, category and distribution of steel scrap on the bath stirring for a 250 t-converter. It was found that the existing of steel scrap influenced the bath stirring during the blowing process. Different bath stirring can be observed when adding light and heavy steel scrap in the bath. Generally, the mixing time increased when the light scrap volume increased in the bath. Comparing to the mixing time without steel scrap addition, the mixing time increased 48.60% and 134.70% when 20 and 60 t steel scrap were added into the bath with the bottom flow rate of 50 L/min, respectively. However, different change trends can be observed when applying heavy steel scrap, which distribution affected the bath stirring, in turn affected the mixing time of the bath. For the heavy steel scrap, the mixing time increased when the scrap volume increased, and decreased when the bottom blowing flow rate increased when the scrap was centralized distributed. Excessive bottom blowing flow rate would react against the decreasing of the mixing time when the flow rate was more than 40 L/min. However, the change trend of mixing time with scrap volume and bottom blowing flow rate changed when the same amount of steel scraps were uniformed distributed. For a uniform distribution of heavy scrap (40 and 60 t) in the bath, the mixing time decreased 30.13% and 12.93% compared to that of adding 20 t steel scraps when the bottom blowing flow rate was 25 L/min. An unsymmetrical flow which accelerated the horizontal flow in the bath can be acquired when the heavy steel scrap was one-side distributed. This was positive to increase the efficiency of the bath stirring. With the same bottom blowing flow rate (25 L/min) and scrap amount (40 t), the mixing time with uniform and one-side distribution of scrap decreased 38.87% and 41.01% compared to centralized distribution of scrap in the bath, respectively.
Yong LIU Nanyang DENG Xiaobin ZHOU Duogang WANG Shiheng PENG
. Influence of steel scrap on the mixing of converter bath[J]. The Chinese Journal of Process Engineering, 2019
, 19(6)
: 1178
-1185
.
DOI: 10.12034/j.issn.1009-606X.219133
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