31计算中间包内各区域体积分数的新方法9-1.docVIP

中间包冶金洁净化技术（part 2） ——计算中间包内各区域体积分数的新模型 潘宏伟1，程树森 程子建1, 2 （北京科技大学冶金与生态工程学院，北京 100083）Purifying Technology in the Tundish Metallurgy ( part B ) －A New Approach to Calculate the Different Regions’ Volume Fraction in Tundish PAN Hongwei1，CHENG Shusen1 CHENG Zijian1,2 (1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Hongxing Stock Company of Jiugang, Jiayuguan 735100, Gansu, China) Abstract: So far, there are two widely used approaches to calculate different regions’ volume fraction for single-strand tundish, but they are proved to have some limitation. Few people do research about approach of calculating different regions’ volume fraction for multi-strand tundish. These will greatly inhibit the development of tundish designing and tundish metallurgy. In this paper, further study about the application of residual time distribution (RTD) concept in tundish metallurgical field is carried on, including the case of single-strand tundish and the case of multi-strand tundish. Then, basing on mathematical simulation, a completely new calculation approach is attempted to propose for the first time, and it is easy to calculate the different regions’ volume fraction in tundish. In the new approach, the standard of how to deal with RTD-curve is proposed definitely, and it is much complete and helpful to the application of RTD concept in metallurgy field. Definition of all regions in tundish flow field are further specified in the new approach, and especially, dead region’s definition is made more clear, which concept is always ambiguous for people before, and it can be adaptable to redefine according the actual demand. Newly proposed approach can distinguish different flow patterns sensitively. Especially, new approach is suitable for both of single-strand tundish and multi-strands tundish, but no other approach can do it so far. What’s more, new approach has consider the bypass flow, which is critical fo