吹氩结晶器内氩气泡对液态保护渣传热及流动行为的影响

项目名称： 吹氩结晶器内氩气泡对液态保护渣传热及流动行为的影响

项目编号： No.51474163

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 程常桂

作者单位： 武汉科技大学

项目金额： 80万元

中文摘要： 为防止水口堵塞和钢水二次氧化，促进结晶器内夹杂物上浮，连铸中一般从水口吹入一定量的氩气，氩气从钢液进入液态保护渣时，会导致液渣出现乳化现象，液渣的流动性和传热性发生改变，可带来钢液卷渣或铸坯表面缺陷问题。吹氩结晶器中，氩气泡在液态保护渣内的运动形式、分布状态是什么？氩气泡运动、分布状态如何影响液渣的流动及传热行为？液渣流动性和传热性的改变对结晶器内钢渣界面行为有何影响？这些问题前人研究很少，需要进一步探索。本申请项目将以解决这些问题为目标，通过电阻探针法测量液态保护渣内气泡的运动、分布行为；利用黏度测定法研究液渣的流动行为；利用瞬态热线法、热电偶法研究液渣的传热行为；结合理论分析和数学模型，从根本上理解吹氩结晶器内气泡对液渣流动和传热行为影响的机理，探寻其对钢渣界面波动及卷渣行为的影响规律，基于这些研究，提出优化吹氩工艺参数及保护渣性能的方法，为生产高质量的连铸坯提供理论依据和操作指导。

中文关键词： 连铸结晶器；吹氩；液态保护渣；传热；流动行为

英文摘要： To prevent reoxidation of molten steel and the nozzle clogging and promote the floating of inclusions in the mold, the argon gas is generally blown into the mold through submerged nozzle. When the argon gas enters into liquid mold flux from liquid steel, it can bring changing of the heat transfer and fluidity of the liquid mold flux, furthermore, it may cause slag entrapment or surface defects of strand. What is the movement and distribution behavior of argon bubbles in liquid mold flux, How is the heat transfer and fluid flow behavior of liquid mold flux influenced by argon bubbles? What is the influence of these changing on interfacial behavior between liquid mold flux and liquid steel? Metallurgists have rarely studied these problems, these problems need to be deeply studied. The goal of this project application is to resolve above problems, the movement and distribution behavior of argon bubbles will be measured by the resistance probe in liquid mold flux, the fludity of liquid mold flux will be studied by viscometry, the heat transfer behavior of liquid slag will be studied by the thermocouple method and the hot wire method. Then, the influence roles of argon bubbles on the fluidity and heat transfer behavior of liquid slag can be revealed combined with theoretical analysis and mathematical modeling, the influence rules of interface behavior between liquid steel and slag can be explained reliably. Based on these studies, then, we can propose the optimization method for process parameters of blowing argon gas and mold flux performance, which can provide a theoretical basis and operational guidance for production of high quality strand.

英文关键词： Continuous casting mold;blowing argon gas;liquid mold flux;heat transfer;flow behavior