连铸坯感应加热三维有限元数值模拟研究
发布时间：2018-07-14 19:52
【摘要】：感应加热技术涉及电磁场与温度场等多物理场相互耦合问题，已经成为了当今冶金工程、电气工程和材料科学等领域交叉研究的热门课题。感应加热利用电磁感应产生涡流焦耳热对工件进行补偿加热，与传统方法相比具有高效率、低污染、安全、精确控制等特点，在工业生产中得到普遍应用。 热连轧生产中，由于连铸坯结晶水冷、传送散热，出现了轴向温度“头低尾高”和纵向横截面温度“芯表温差”现象，传统的二维有限元数值模拟方法只能对横截面芯表温差进行模拟分析，导致感应加热过程的模拟精度不高。针对这一问题，本文开展连铸坯感应加热三维有限元数值模拟研究，主要做了以下几方面工作： (1)连铸坯感应加热三维有限元模型建立。根据电磁感应原理，针对涡流场模型，将电磁场产生的涡流焦耳热作为新的温度场的内热源，确定初始条件和边界条件，得出三维电磁—热耦合场数学模型，建立了精确的有限元模型。 (2)连铸坯感应加热三维有限元模拟验证。根据连铸坯感应加热实际工况，，对热辐射和热对流、轴向热传导、线圈电流与涡流相互影响和物理参数随温度变化等关键技术进行处理，利用有限元软件ANSYS对电磁-热耦合场进行三维有限元法模拟，根据三维模拟结果，与实际值和二维模拟结果进行对比验证。 (3)连铸坯感应加热效果影响因素分析。影响连铸坯感应加热因素通常有两类，一类是感应器设备参数，如感应器与工件的空隙、线圈匝数和感应器在整个工艺生产线的安装位置等；另一类是感应器电参数，如输出电流和输出频率等。经过三维有限元模拟实验得到：输出电流和线圈匝数虽然不能影响温度分布，但可以影响加热效率；感应器频率可以改变铸坯温度分布，使边角温度得到补偿加热。在热送过程中，有无保温罩对铸坯进入感应器初始温度影响较大。通过各因素对感应加热效果的分析，为提高连铸坯感应加热质量提供参数调节依据。
[Abstract]:Induction heating, which involves the coupling of electromagnetic field and temperature field, has become a hot topic in the field of metallurgical engineering, electrical engineering and material science. Induction heating uses eddy current Joule heat produced by electromagnetic induction to compensate and heat the workpiece. Compared with traditional methods, it has the characteristics of high efficiency, low pollution, safety and accurate control, and is widely used in industrial production. In hot strip rolling, due to the cooling of crystal and heat dissipation of continuous casting billet, the phenomenon of axial temperature "low end height" and longitudinal cross section temperature "core surface temperature difference" appears. The traditional two-dimensional finite element numerical simulation method can only simulate and analyze the temperature difference of cross-section core, which leads to the low accuracy of induction heating process. In order to solve this problem, the three-dimensional finite element simulation of induction heating for continuous casting billet is studied in this paper. The main works are as follows: (1) the three-dimensional finite element model of induction heating for continuous casting billet is established. According to the electromagnetic induction principle, according to the eddy current field model, the eddy current joule heat produced by the electromagnetic field is taken as the internal heat source of the new temperature field, and the initial conditions and boundary conditions are determined, and the mathematical model of the three-dimensional electromagnetic and thermal coupling field is obtained. An accurate finite element model is established. (2) 3D finite element simulation of induction heating for continuous casting billet. According to the actual condition of induction heating of continuous casting billet, the key technologies such as heat radiation and heat convection, axial heat conduction, interaction between coil current and eddy current, and the variation of physical parameters with temperature are dealt with. The finite element software ANSYS is used to simulate the electromagnetic and thermal coupling field. The results are compared with the actual values and two-dimensional simulation results. (3) the factors affecting the induction heating effect of continuous casting billet are analyzed. There are usually two kinds of factors affecting induction heating of continuous casting billet, one is inductor equipment parameter, such as the gap between inductor and workpiece, the number of coil turns and the installation position of inductor in the whole process production line, the other is inductor electric parameter. Such as output current and output frequency. Three dimensional finite element simulation experiments show that the output current and coil turns can not affect the temperature distribution, but can affect the heating efficiency, and the frequency of the inductor can change the temperature distribution of the billet and make the edge angle temperature compensated and heated. In the process of heat transfer, the influence of heat preservation cover on the initial temperature of billet entering inductor is great. Through the analysis of the effect of induction heating by various factors, the parameter adjustment basis is provided for improving the quality of induction heating of continuous casting billet.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG307
本文编号：2122769
[Abstract]:Induction heating, which involves the coupling of electromagnetic field and temperature field, has become a hot topic in the field of metallurgical engineering, electrical engineering and material science. Induction heating uses eddy current Joule heat produced by electromagnetic induction to compensate and heat the workpiece. Compared with traditional methods, it has the characteristics of high efficiency, low pollution, safety and accurate control, and is widely used in industrial production. In hot strip rolling, due to the cooling of crystal and heat dissipation of continuous casting billet, the phenomenon of axial temperature "low end height" and longitudinal cross section temperature "core surface temperature difference" appears. The traditional two-dimensional finite element numerical simulation method can only simulate and analyze the temperature difference of cross-section core, which leads to the low accuracy of induction heating process. In order to solve this problem, the three-dimensional finite element simulation of induction heating for continuous casting billet is studied in this paper. The main works are as follows: (1) the three-dimensional finite element model of induction heating for continuous casting billet is established. According to the electromagnetic induction principle, according to the eddy current field model, the eddy current joule heat produced by the electromagnetic field is taken as the internal heat source of the new temperature field, and the initial conditions and boundary conditions are determined, and the mathematical model of the three-dimensional electromagnetic and thermal coupling field is obtained. An accurate finite element model is established. (2) 3D finite element simulation of induction heating for continuous casting billet. According to the actual condition of induction heating of continuous casting billet, the key technologies such as heat radiation and heat convection, axial heat conduction, interaction between coil current and eddy current, and the variation of physical parameters with temperature are dealt with. The finite element software ANSYS is used to simulate the electromagnetic and thermal coupling field. The results are compared with the actual values and two-dimensional simulation results. (3) the factors affecting the induction heating effect of continuous casting billet are analyzed. There are usually two kinds of factors affecting induction heating of continuous casting billet, one is inductor equipment parameter, such as the gap between inductor and workpiece, the number of coil turns and the installation position of inductor in the whole process production line, the other is inductor electric parameter. Such as output current and output frequency. Three dimensional finite element simulation experiments show that the output current and coil turns can not affect the temperature distribution, but can affect the heating efficiency, and the frequency of the inductor can change the temperature distribution of the billet and make the edge angle temperature compensated and heated. In the process of heat transfer, the influence of heat preservation cover on the initial temperature of billet entering inductor is great. Through the analysis of the effect of induction heating by various factors, the parameter adjustment basis is provided for improving the quality of induction heating of continuous casting billet.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG307
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