【作者】 江庆元； 魏季和； 朱宏利； 池和冰； 王海江；

【Author】 Jiang Qingyuan~1 Wei Jihe~(2*) Zhu Hongli~2 Chi Hebing~1 WangHaijiang~2 (1.Stainless Steel Brunch,Baoshan Iron & Steel Co.,Ltd.,Shanghai 200431,China;2.Department of Metallic Materials,College of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

【机构】 宝山钢铁股份有限公司不锈钢分公司； 上海大学材料科学与工程学院；

【摘要】 在120 t AOD 炉的水模型装置上研究了不锈钢侧顶复吹 AOD 精炼过程中熔池内气体搅拌和流体流动特性。模型与其原型几何相似比为1:4。基于侧枪和顶枪内气流特性计算合理确定了模型吹气量,保证了其与原型间相当高的运动相似性。考察了侧吹和顶吹气量、侧枪数和侧枪间夹角的影响。结果表明,在多股侧吹气流驱动下,整个熔池液体处于活泼的搅拌和循环运动状态,不存在明显的"死区";侧吹主枪气量对气体搅拌和液体流态有决定性的作用,就搅拌而言, 侧吹气量越大,气体搅拌能越高,熔池液面越活跃;在给定的侧枪数和侧吹气量下,侧枪间夹角越大,气体对熔池的搅拌越均匀;顶吹气流会改变由侧吹气流引起的熔池内气体搅拌和液体流态,使紊流程度增强;顶吹气量越大,相应的变化越显著。更多还原

【Abstract】 The gas stirring and fluid flow character- ristics in the bath during the combined side and top blowing AOD (argon-oxygen decarburization) refi- ning process of stainless steel were studied on a water model unit of a 120t AOD converter equipped with seven side tuyeres (annular tube type) and one top lance (Laval type). The geometric similarity ratio of the model to its prototype (including the side tuyeres and the top lances) was 1:4. Based on the theoretical calculations of the gas jet properties in the side tuyeres and the top lances, the gas blowing rates utilized for the model were reasonably determined. Thus, considerably high kinematic similarity between the model and its prototype was ensured. The influences of the gas flow rates both for side and top blowing, the side tuyere number and the angle included between each tuyere on the characteristics were examined. The results showed that under driving of multiple gas side blowing, streams, the liquid in the whole bath was in active agitation and circulatory motion, and there was no evident dead zone in the bath. The gas blowing rate of the side main tuyere possessed a key role in the gas stirring and liquid flow pattern in the bath. As far as the stirring is concerned, the larger the gas side blowing rate, the higher the stirring energy input, the more vigorous the liquid surface of the bath. At a given tuyere number and a gas side blowing rate, the larger the angle included between each tuyere, the more uniform the gas stirring to the bath. The gas top blowing jet from the lance could change the agitation and liquid flow pattern in the bath caused by the gas side blowing streams, making the turbulent intensity increase, and the larger the gas top blowing rate, the more obvious the corresponding change.更多还原