板坯连铸浸入式水口及结晶器内钢液流态的研究现状分析
Review on the flow pattern of molten steel in the submerged entry nozzle and the mold of continuous casting slabs
田玉石 1仇圣桃 2朱荣 3徐李军 2时朋召 2王旭2
作者信息
- 1. 北京科技大学冶金与生态工程学院,北京 100083;钢铁研究总院连铸技术国家工程研究中心,北京 100081
- 2. 钢铁研究总院连铸技术国家工程研究中心,北京 100081
- 3. 北京科技大学冶金与生态工程学院,北京 100083;北京科技大学碳中和研究院,北京 100083
- 折叠
摘要
通过系统分析连铸水口及结晶器内钢液流态的研究现状,深入探讨了不同工况条件下流态的转变规律、共性特征、影响因素及其对铸坯质量的影响,并着重分析了结晶器流动的非对称性.认为:①水口内存在气泡流、膜状流、环状流和段塞流等多种流态,流态受液体流量、气体流量和中间包液位影响.其中,气泡流相对稳定,有利于连铸生产.②当板坯结晶器处于对称的双辊流状态,且液面流速控制在 0.26～0.43 m/s时,有助于显著提高铸坯质量;同时,较高的拉速、较低的氩气流量以及增大的水口浸入深度有助于形成双辊流.③流动非对称性会引发偏流,通过精准的工艺操作可保障生产顺行并提高铸坯质量.
Abstract
Through a systematic analysis of the current researches on flow patterns in the nozzle and mold,this study explores the transformation laws,common characteristics,influencing factors,and their effects on slab quality under various operating conditions,with a particular focus on the asymmetry of flow in the mold.The conclusions are as follows:multiple flow patterns,including bubbly flow,film flow,annular flow,and slug flow,exist within the nozzle and are influenced by liquid flow rate,gas flow rate,and the level of liquid in the tundish.Bubbly flow is relatively stable and beneficial for continuous casting production.When the slab mold operates in a symmetric double-roll flow pattern and the mold surface flow velocity is controlled between 0.26 and 0.43 m/s,it significantly improves the quality of the cast slabs.Meanwhile,a higher casting speed,a lower argon flow rate,and an increased immersion depth of the nozzle have benefit for the formation of the double-roll flow pattern.Flow asymmetry can lead to bias flow.Thus,precise process control can ensure smooth production and enhance slab quality.
关键词
板坯连铸/结晶器/浸入式水口/流态/非对称流动Key words
slab continuous casting/mold/submerged entry nozzle/flow patterns/asymmetric flow引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据