摘要：结晶器中钢液的流动情况还有温度分布情况，对钢连铸过程、操作和的钢质量都有重要的影响，如卷渣、因温度高导致凝固坯壳不够厚而导致拉漏等，温度场和流场对钢的质量有决定性作用。

本文以板坯结晶器为对象作为研究，使用ansys软件中的CFX套件进行温度场和流场的耦合模拟，进行建模采用CFX进行计算求解，再进行后期处理得到后期处理图。观察不同拉速下，结晶器内钢液温度场和流场的变化,并通过比较，选择优化方案。

研究表明：

1)通过对现有的工艺的数据模拟，得到流场可分为三个区域，射流区，上循环区，和下循环区，其中射流区的速度最大。

2)通过对现有工艺的数据模拟，发现宝钢特钢现有工艺情况下，会发生卷渣。

3)通过对优化后的方案进行模拟发现0.5m/min的拉速最适合宝钢特钢的生产。

4)随拉速的增加，会使得高温区下移。

关键词：结晶器；温度场；流场，连铸

Abstract：In the casting process, the crystallizer is the most important one of the devices. The temperature of the molten steel in the crystallizer is also affected. It has an important influence on the quality of the steel. For example, if the flow rate is too high, it will protect the steel. When the slag is brought into the molten steel, slag formation will occur. However, if the temperature is high, the solidified shell will not be thick enough, resulting in leakage. Therefore, the temperature field and flow field have a decisive effect on the quality of the steel.

In this paper, the slab crystallizer is used as the object, and the ansys software is used to simulate the temperature field and the flow field. The finite element method is used to perform the modeling and calculation. Then the post-processing is performed to obtain the post-processing chart. Observe the different casting speeds. Observe and compare the changes of the flow field in the molten steel temperature field in the mold under different casting speeds and the optimization scheme is selected.

research shows:

1) Through the data simulation of the existing process, the flow field can be pided into three areas, the jet zone, the upper circulation zone, and the lower circulation zone, where the velocity of the jet zone is the largest.

2) Through the data simulation of the existing process, it was found that slag formation will occur in the existing process of Baosteel Special Steel.

3) Through the simulation of the optimized scheme, it is found that the casting speed of 0.5 is most suitable for the production of Baosteel Special Steel.

4) In the temperature field, the increase of the pulling speed will cause the high temperature zone to move down.

Key words: Crystallizer; Temperature field; Flow field；Continuous casting

目录

1引言 1

1.1 课题背景、目的意义和研究内容 1

1.1.1课题背景 1

1.1.2目的意义 2

1.1.3研究内容 2

1.1.4研究目标 2

1.2文献综述 2

1.2.1钢的连铸及其结晶器 2

1.2.2结晶器内的传热行为现象及因素 4

1.2.3钢液的凝固 6

2钢液的流动、传热数学模型 13

2.1控制方程 13

2.2结晶器内钢水在稳态条件下的边界条件 14

2.2.1温度场边界条件 14

2.2.2流场计算边界条件 14

3模拟过程 15

3.1几何模型的建立 15

3.2温度场的计算 15

4计算结果及分析讨论 24

4.1现有工艺结晶器内钢水的流体流动 25

4.2现有工艺结晶器内钢水的温度分布 27

4.3拉速对卷渣的影响 30

4.4拉速对温度分布的影响 31

5结论 33

致 谢 34

参考文献 35

1引言

1.1 课题背景、目的意义和研究内容

1.1.1课题背景

钢铁工业依旧是中国目前产业中举足轻重的一个产业，随着科学的进步和经济发展，中国的钢的连铸技术已经有了跨越性的进步。以连铸为中心的生产技术也有了新的指标，钢铸造产工艺发要向着收益高，成本低廉，质量良好的方向发展。钢铁的运用深入各个产业的发展中，而钢的连铸就成为各个产业发展的重要影响因素，可以说是直接影响了国民的经济发展，也成为衡量一个国家工业水平的一项指标。