中间包等离子加热和电磁搅拌复合技术的开发与使用  

Application and development of composite technology of plasma heating and electromagnetic stirring in tundish

作　　者：钟云涛 潘汉玉 Emmanuel Abiona 杨洪良 

机构地区：[1]ABB(中国)有限公司,北京 [2]ABB AB/Metallurgy,Vasteras,瑞典

出　　处：《连铸》2016年第6期37-41,共5页Continuous Casting

摘　　要：在连铸过程中,严格的钢水温度控制是保证连铸坯质量的前提,所以中包温度控制技术成为炼钢研究的方向之一。其中,中包等离子加热技术由于控制灵活,设备简单和清洁无污染具有广阔的应用前景。与感应加热相比,等离子加热在中包包型设计和维护成本上具有明显的优势。另外一面,与感应加热90%的加热效率相比,等离子加热仅有60%的加热效率。因此,如何提高等离子加热效率成为制约其发展的关键因素。ABB对于电磁搅拌和等离子加热相结合的方案做了大量的数值研究分析。结果显示,仅使用等离子加热,那么加热室的上部钢液由于浮力作用而滞流,导致传热效率低下,这是由于等离子加热形成了巨大的温度梯度造成的。结合使用EMS,加热室内的钢液以0.2～0.4 m/s的速度旋流,这加速了中包内钢水的对流传热,使得中包内的钢液温度均匀化,减小了中包水口处的温度波动,提高了等离子加热的热效率。同时,通过等离子加热和电磁搅拌相结合的方式能促进夹杂物上浮,达到净化钢水的作用。During casting, strictly controlling the temperature in tundish is the precondition to guarantee the quality of caster production. Therefore, the technology of controlling tundish temperature is one of the research direction of steel- making. Plasma heating is advantageous over induction heating in the aspects of less impact on tundish design and lower maintenance costs. On the other hand, plasma heating has a lower heating efficiency of 60% compared to that of induction heating 90%. The idea of utilizing electromagnetic stirring was numerically investigated in combination with plasma heating. With plasma heating alone, the flow in the upper part of heating chamber is dampened due to the buoyancy force caused by the large temperature gradient of plasma heating. With EMS, one rotational flow with the velocity of 0.2-0.4 m/s is created in the heating chamber, and the temperature in the heating chamber is homogenized. The tempera- ture response time in the outlet is reduced and heating efficiency of plasma heating can be improved with EMS. Mean- while, using the combination method of Plasma and EMS is able to accelerate inclusion floating result in cleaning the molten.

关 键 词：中包 感应加热 等离子加热 电磁搅拌 

分 类 号：TF777[冶金工程—钢铁冶金]