210t双联复吹转炉水模实验研究

Water-model Study of a 210 t Duplex Combined Blown Converter

以相似模型实验理论为基础,针对工程设计的210t双联复吹转炉,通过冷态模型实验,研究了底吹元件数目、底吹元件布置方式、底吹供气强度、氧枪枪位对熔池混匀时间的影响.在实验条件下,采用八支底吹供气原件,相对集中布置在0.33D,0.62D的两个同心圆上时,可有效缩短混匀时间.对于脱磷转炉,当枪位在350mm(对应原型2800mm)、底吹供气强度为0.24Nm3/min时,混匀时间最短,比较合理的底吹供气强度在0.21~0.27Nm3/(min·t)范围内.对于脱碳转炉,当顶枪枪位在225mm(对应原型1800mm),底吹供气强度为0.18Nm3/min时混匀时间最短,比较合理的底吹供气强度在0.15~0.21Nm3/min范围内.

Based on similarity theory of model experiment and a 210 t duplex combined blowing converter,by means of the cold model experiment,the influential factors of the number and configuration of bottom tuyeres,bottom gas supply strength and lance height on the mixing time were studied.The results showed that the shortest mixing time could be obtained when eight tuyeres were used and located at the eccentric positions of 0.33D and 0.62D at the bottom of the converter in the direction of its ear-axis.As to the dephosphorization converter,when the lance height was 350 mm(corresponding to 2800 mm in the industrial case) and the bottom gas supply strength was 0.24 Nm3/(min-t),the shortest mixing time could be obtained.The reasonable bottom gas supply strength was between 0.21 and 0.27 Nm3/(min-t).As to the decarbonization converter:When the lance height was 225 mm(corresponding to 1800 mm in the industrial case) and the bottom gas supply strength was 0.18 Nm3/(min-t),the shortest mixing time could be obtained.The reasonable bottom gas supply strength was between 0.15 and 0.21 Nm3/(min-t).