Since the entire electrode and control system are fixed on the CD-LF station, the electrodes (cathode electrode and anode electrode) can only be moved vertically and continuously. Therefore, the accuracy of positioning the tanker in the CD-LF station directly affects the electrode in the ladle. The location. The ladle refractories close to the electrodes are accelerated by DC arc erosion to accelerate the damage. In severe cases, there is even the possibility of causing punctures. Measures to suppress arc arc arc. In view of the characteristics of DC arc combined with the specific characteristics of the DC-LF furnace equipment of our branch, we developed the following measures to suppress the arc of the DC arc.
Prior to power transmission and smelting, steel makers must reasonably adjust the flow rate of the argon blowing and blowing, and must not excessively form splashes of molten steel and produce foamy slag to ensure submerged arc smelting after the arc is transmitted. Its purpose is: First, to reduce the large fluctuations of the arc current, to form a good heating atmosphere, try to convert the DC power into the thermal effect of molten steel, and secondly, if no foam slag is created, the DC arc will make the ladle refractory due to the longer arc. The material is directly eroded by the thermal radiation of the high-temperature arc and exfoliated, which reduces the service life of the ladle. At the same time, the thermal energy loss of the DC arc is also large.
In the process of smelting and transmitting electricity, power transmission is strictly controlled according to the optimized power curve, and smelting of large voltage and small current is prohibited. The arc start phase requires a 310V power supply with a primary voltage of 21000A and a time of less than 15 minutes. During the smooth temperature rise of the arc, a secondary voltage of 280V must be used, and the current must be controlled at about 21000A. This completely eliminates the use of primary voltage in the entire smelting process. The phenomenon of 310V suppresses the erosion of the arc of the DC arc on the wall of the steel ladle and increases the service life of the ladle.
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