摘要
以一种150t椭圆形钢包为原型建立1∶4的钢包水模型,在相似原理基础上,以氮气模拟现场用氩气进行底吹,以水模拟钢液,进行水模型实验.分析了底吹气孔位置、吹气量对钢液混匀及流动的影响.结果表明:原型方案两吹气孔位置距离近,相互干扰性强,动能耗散大,影响钢液搅拌效果.底吹气量存在临界值(327.6L·h-1),超过临界值后气量增加的动能主要消耗在鼓动液面和吹开渣面上,对钢液混匀的效果较小.优化后两底吹气孔分别位于长轴0.6R处,呈180°分布,优化后钢液混匀时间整体下降,相同吹气量下混匀效果更好.采用优化后方案,相同吹气量下钢液面裸露面积大大降低,减少了钢液二次氧化,钙处理过程全氧从58×10-6降低到47×10-6,软吹过程平均增N量<3×10-6.
The blowing hole location and the gas flow in a 150 t elliptic ladle were optimized by establishing a 1∶ 4 water model.Based on the similarity criterion,high pressure nitrogen was used to simulate argon in the water modelling experiment. Experimental results show that the mixing of liquid steel is weak in the original ladle because the two blowing holes are close to each other. A critical gas flow exists at different locations. Beyond the critical value,the increase in kinetic energy mainly is used to stir liquid steel and blow the slag surface. After optimization,the two blowing holes distribute in 180° and are arranged at the 0. 6 radius of the major axis respectively. The mixing time of liquid steel shortens and the exposed area of liquid steel reduces greatly compared with the original ladle with the same gas flow. Moreover,the total oxygen decreases to 47 × 10- 6from 58 × 10- 6during calcium treatment,and the average nitrogen pick-up amount is less than 3 × 10- 6during the soft stirring process.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2014年第S1期1-5,共5页
Chinese Journal of Engineering
基金
博士后特别资助基金资助项目(2013T60062)
钢铁冶金新技术国家重点实验室基金资助项目(41602014
KF13-09)
国家自然科学基金资助项目(51274029)
高等学校博士学科点专项科研基金资助项目(20130006110023)
关键词
精炼
钢包
吹氩
液体流动
水模拟
refining
ladles
argon blowing
flow of fluids
water modelling
