电磁出钢系统中感应加热电源设计及其对系统可靠性的影响

Power supply design in electromagnetic induction controlled automated steel-teeming system and its effects on system reliability

为了将电磁出钢技术应用于工业生产,需对该系统所用的感应加热电源以及电源在加热过程中系统的可靠性进行分析。利用工业实验和数值模拟方法考察自行设计的钢包内钢水质量为1.5 t的电磁出钢系统钢包的开浇时间,对比验证模型的正确性。在此基础上,考察电源参数(电流I,电源频率f)对300 t电磁出钢系统用钢包开浇效率的影响,以及电源在工作过程中线圈与钢包底壳的温度分布和等效应力。研究结果表明:电流和电源频率均影响钢包的开浇效率,适用于300 t钢包的感应加热电源参数为:I=500 A,f=16 k Hz。该参数电源的运行对线圈和钢包底壳的安全性影响较小,线圈与钢包底壳均满足材料的安全性要求,系统可以安全用于生产。

In order to use the electromagnetic steel technology in industrial production, the induction heating power supply used in the system and the system reliability need to be investigated when the power supply is in operation. The industrial experiments and numerical simulation were employed to investigate the teeming time of a self-designed ladle（with the mass of molten steel of 1.5 t in steel ladle） with an electromagnetic induction controlled automatic steel-teeming system. The calculated results were consistent with the experimental ones. The effect of the power parameters（current I, power frequency f） on the teeming efficiency of the industrial ladle（300 t） with the system was investigated. And the influences of the operating power supply on the temperature distribution and equivalent stress of the coil and ladle bottom shell were also analyzed. The results show that the current and power frequency both impact the ladle teeming efficiency and that the power parameters suitable for the ladle（300 t） are I = 500 A, f = 16 k Hz. The operating power supply with the parameters has little effect on the safety of the coil and ladle bottom shell. The coil and ladle bottom shell both meet their safety requirements, and the system can be safely used in production.