关键词: 60 t LF, 供电制度；电气特性曲线；电耗；升温速度

Abstract: By investigating the transformer parameters of 60 t LF in a steelmaking workshop and combining with the selected test GCr15 steel LF process characteristics, the software is developed, and its electrical power characteristic curve is calculated, two power supply schemes that are suitable for the LF with the fastest heating speed and relatively power saving and the most economical power consumption are proposed. The first power supply scheme, at slagging and heating phase in the first stage the 4 stages (220 V) voltage and 18-20 kA phase current are adopted, and at heating phase in the second stage the 3 stages (240 V) voltage and 20 kA phase current are adopted, which is suitable for LF secondary power supply with fast production rhythm and relatively power saving. In the second power supply scheme,the5-grade(203 V)voltage and 17- 19 kA current power supply system are adopted in the first stage of slag melting and heating up; in the second stage of heating up, the 4-grade(220 V)voltage with 18 kA current is adopted; in the third stage, the heat preservation period is the same as the first power supply scheme, it can be applied to most of the production rhythm not too tight heats. Compared with the index before the test of the power consumption per ton of CCr15 steel and energy consumption per unit weight of molten steel temperature rise, the main energy consumption is reduced by8.51% and7.29% respectively, and the heating rate is increased by 8. 14%.

Key words: 60t LF, Power Supply System, Electrical Characteristic Curve, Power Consumption, Rate of Heating