2018 Volume 58 Issue 7 Pages 1224-1231
The steel-teeming time, which is directly affected by the output parameters of the power supply, is one of the most important technical indicators of an electromagnetic steel-teeming system. Therefore, this work employs numerical simulation to build a power supply output parameter model for the electromagnetic steel-teeming system of a 110 t ladle of a steel mill. The correctness of the model is verified through a high-temperature offline test. The results of the simulation correspond closely to those of the offline test. Furthermore, the best combination of power supply output parameters was found to be: frequency 35.3 kHz, output current 152.9 A, output power 40.1 kW, and steel-teeming time 113 s. The factors influencing these parameters and the teeming time are summarized as follows: the magnitude of each power supply output parameter (i) increases, (ii) decreases initially then increases, (iii) decreases slightly, (iv) decreases initially then increases, and (v) decreases initially, increases rapidly, and then changes gradually with increasing (i) diameter of the liquid steel channel, (ii) length of the liquid steel channel, (iii) static pressure of the ladle, (iv) steel-teeming temperature, and (v) standing time, respectively; larger power supply output parameters are needed for the horn-shaped (as shown in Fig. 3) liquid steel channel than for the cylindrical channel. This article will serve as a theoretical reference for reducing the steel-teeming time of the electromagnetic steel-teeming system.
