Electric arc furnace of the technical advantages

Analysis of advantages of electric arc furnace bottom blowing technology :

(1) Promote the melting of scrap steel, reduce the soft melting phenomenon of cold zone, in order to help eliminate the existence of cold zone in the process of eAF steelmaking.  

(2) it is beneficial to improve the reaction rate of steel slag interface, contribute to the adsorption and removal of inclusions in eAF crude steelmaking, increase the reaction rate of dephosphorization and decarburization, and shorten the smelting process  

(3) The speed of molten steel moving in the molten pool is increased, which is helpful to eliminate the temperature imbalance in the molten pool and reduce the temperature of the molten steel.  

(4) Due to the stirring effect of bottom blowing gas, the interface reaction of steel slag tends to be more balanced, which reduces the content of iron oxide in the slag and is conducive to the reduction of iron consumption.  

(5) The life of the furnace lining is improved because the steelmaking temperature and the content of iron oxide in the slag are reduced.  

Due to the above advantages, the technology of eAF bottom blowing has been paid more attention and developed in recent years.  Bottom blowing technology is mainly in the arc furnace bottom into 120° Angle distribution of three pieces of ventilation  

Between the furnace bottom ramming material filled.  

When the first furnace is used, no gas is supplied, and the plug brick can be replaced when it is seriously damaged. The replacement method is similar to that of replacing EBT sleeve brick.  The cold zone of the eAF is shown in Figure 1. The general gas supply pressure of the bottom-blown gas brick is between 0.3-1.2mpa, and the flow rate (standard state) of the stirred gas is controlled between 0.002 and 0.001m3/(min·t) for the best effect.  The gas used for bottom blowing is nitrogen  

Argon, which is used as the bottom-blown gas, can reduce the nitrogen content in steel.  In order to reduce costs, some manufacturers use different gas media in different stages, in Oberh  

When the temperature of molten steel is below 1550℃, nitrogen is blown, and argon is blown between 1550℃ and 1650℃. Because the temperature of molten steel is below 1550℃, the amount of nitrogen absorption of molten steel is small.