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Graphite electrode description and classification
The graphite electrode DC arc furnace used in DC arc furnaces is a new type of electric furnace steelmaking equipment that was developed in the early 1980s. The initial DC arc furnace was transformed from the original AC arc furnace, and some of them use three graphite electrodes. Some use two graphite electrodes, but most newly designed DC arc furnaces after the mid-1980s use only one graphite electrode. Compared to an alternating-current electric arc furnace using three graphite electrodes at the same power, electrodes that are oxidized at high temperatures are always used. The surface area is greatly reduced. In the same DC arc furnace operating at ultra-high power, the graphite electrode consumption per ton of steel can be reduced by about 50%. DC arc furnace current does not generate skin effect and proximity effect when passing through the electrode, and the electrode cross-section The current distribution is even, and the stability of the DC arc is good, the mechanical vibration during operation is small, and the noise of the electric furnace is also low. The diameter of graphite electrodes used in DC arc furnaces is also calculated based on the electric furnace capacity and the allowable current density of the electrodes. For ultra-high power electric furnaces with the same input power, a graphite furnace electrode using a direct current furnace has a larger electrode diameter, such as An AC electric arc furnace with a capacity of 150t uses an electrode with a diameter of 600mm, and a DC electric arc furnace with the same capacity needs to use an electrode with a diameter of 700-750mm, and the DC arc furnace has a higher quality requirement for the graphite electrode than the AC electric arc furnace.