不锈钢AOD转炉吹炼过程中熔池混合特性初探  

PRELIMIMARY INVESTIGATION OF BATH MIXING CHARACTERISTICS DURING THE BLOWING PROCESS OF STAINLESS STEEL IN AN AOD CONVERTER

作　　者：车立兵[1] 朱宏利[1] 王新超[1] 魏季和[1] 史国敏[1] 江庆元[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]宝山钢铁股份有限公司不锈钢分公司

出　　处：《上海金属》2006年第5期25-30,共6页Shanghai Metals

基　　金：国家自然科学基金和宝钢集团公司联合资助(No.50374047)

摘　　要：利用水力学模拟,对不锈钢AOD转炉吹炼过程中熔池混合特性作了初步研究。模型和原型(包括喷枪)间的几何相似比为1/4。依据喷枪内气流特性参数的理论计算确定模型吹气量,并考察了侧枪数及枪位和侧、顶吹气量对混合特性的影响。结果表明,吹炼过程中液体循环运动活跃,熔池中不存在明显的“死区”,混合效果良好。侧吹主枪气量对熔池内液体的混合起决定性的作用,适当增大侧吹副枪气量也可使混合效率提高,而顶枪气流使混合时间延长。对应于工艺规定的顶吹氧量,对于侧枪,5枪-22·5°或27°夹角,6枪-27°夹角都能达到大体相当的良好的混合效果。得到了混合时间与主、副侧枪及顶枪气量、两相邻侧枪间夹角和侧枪数的关系。The mixing characteristics of the liquid in the bath of a 120t AOD convener during the refining process of stainless steel with side and top combined blowing have been preliminarily examined on a water model unit. The geometric similarity ratio between the model and its prototype （including the side tuyeres and the top lance） was 1：4. Based on the theoretical calculations for the parameters of the gas streams in the tuyeres and the lance, the gas blowing rates used for the model were more reasonably determined. The influence of the number and position of tuyere, and the gas flow rates for side and top blowing on the mixing characteristics was considered. The results demonstrated that the liquid in the bath underwent vigorous circulatory motion during the blowing, without obvious dead zone in the bath, resulting in a well mixing effectiveness. The gas flow rate of the main tuyere had a governing role on the mixing, and a suitable increase in the gas flow rate of the subtuyere could enhance mixing efficiency, while the gas jet from top lance could prolong the mixing time. Corresponding to the specified oxygen top blowing flow rate by the technology, five side tuyeres with an angular separation of 22.5 or 27 degree and six side tuyeres with an angle of 27 degree between each tuyere, could all reach an essentially equivalent and good mixing effectiveness, The relationships of the mixing time with the gas blowing rates of the main-tuyeres and sub-tuyeres and top lance, the angle between each tuyere, and the tuyere number were obtained.

关 键 词：不锈钢冶炼 水力学模拟 AOD转炉 侧顶复吹过程 熔池混合特性 

分 类 号：TF811.031[冶金工程—有色金属冶金]