连铸直轧板坯感应加热过程的有限元模拟

发布时间：2018-07-22 16:06

【摘要】：钢铁行业未来的发展方向趋向于技术上的节能降耗,在诸多新技术中,连铸直轧技术有着广阔的应用空间。连铸直轧工艺中铸坯不需要经过加热炉,只需在输送过程中补热,因而具有较高的经济效益和环境效益。铸坯感应加热是连铸直轧技术中的一个关键环节,因此,深入进行铸坯的感应加热规律研究,才能使连铸直轧技术得到长远发展和推广。感应加热问题涉及到电磁场和温度场,数值模拟繁琐复杂。虽然借助于计算机的高效运算,仍然需要处理复杂的物理模型,否则结果往往和实际有较大偏差。本文从电磁学和传热学基础理论入手,考虑初始不均匀温度场和运动影响,采用有限元软件ANSYS进行了板坯的感应加热三维模拟,为实际生产中板坯感应补热提供理论依据。首先在考虑参数随温度变化等条件下,对静止板坯进行感应加热有限元模拟,得到了板坯温度分布,结果中发现板坯边角部分温度相对较低。通过模拟研究了线圈形状对感应加热效率的影响,探索了不同电流密度、不同频率对板坯温度分布的影响。然后进行了感应加热试验验证模拟可靠性,并采用红热像仪测定工件温度分布。试验结果与模拟规律一致,数据拟合良好。解决了板坯感应补热实际工况模拟的一些关键问题。通过模拟板坯辊道输送空冷过程,得到空冷结果作为板坯加热的初始温度场。为了使模拟更切合实际,考虑板坯相对线圈的运动,实现方法是用VB调用ANSYS实现板坯的步进运动。最后在考虑初始温度场不均匀和板坯运动的情况下,模拟板坯纵向磁通感应补热,分析了温度场的分布规律。模拟分析了横向磁通感应加热基本规律,并在纵向磁通感应补热的基础上,进行板坯横向磁通感应补热的模拟,最终补热结果可以满足连铸直轧的要求。
[Abstract]:The future direction of steel industry tends to reduce energy consumption and reduce energy consumption in technology. In many new technologies, continuous casting technology has wide application space. The casting billet in continuous casting process does not need to pass through the furnace, only need to fill the heat in the process of transportation, so it has high economic and environmental benefits. As a key link in rolling technology, the research on the induction heating law of the casting billet can make the continuous casting technology develop and popularize in the long run. The problem of induction heating involves the electromagnetic field and temperature field, and the numerical simulation is complicated and complicated. Although the complex physical model still needs to be treated with the help of the computer's high efficiency operation, it is still necessary to deal with the complex physical model. This paper, starting with the basic theory of electromagnetics and heat transfer, takes into consideration the initial uneven temperature field and the influence of motion, and uses the finite element software ANSYS to simulate the induction heating of the slab, which provides a theoretical basis for the induction heating of the slab in the actual production. Under the condition of the finite element simulation of induction heating, the temperature distribution of slab is obtained. The result shows that the side corner temperature of slab is relatively low. Through simulation, the influence of coil shape on induction heating efficiency is studied, and the influence of different current density and frequency on slab temperature distribution is explored. The thermal test was used to verify the reliability of the simulation, and the temperature distribution of the workpiece was measured by the red heat imager. The test results were in agreement with the simulation law, and the data fitted well. Some key problems in the simulation of the actual working condition of induction heating were solved. The air cooling results were obtained as the initial temperature field of the slab heating by simulating the blank cooling process of the slab roller. In order to make the simulation more realistic and consider the motion of the slab relative to the coil, the realization method is to use the VB to call the ANSYS to realize the step motion of the slab. Finally, the longitudinal flux induction heating is simulated under the condition of the inhomogeneous initial temperature field and the slab motion, and the distribution law of the temperature field is analyzed. The transverse flux induction heating is simulated and analyzed. On the basis of the longitudinal flux induction heating, the lateral flux induction heating is simulated on the basis of the longitudinal flux induction heat. The final heating result can meet the requirements of continuous casting straight rolling.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG335.9

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