Abstract
Results of analytically studied effect of electromagnetic blowing and the slag height on the arc efficiency are stated. An arc is blown from under an electrode toward the furnace walls under an electromagnetic force, arc radiation on the wall and roof increase and effective output, absorbed by the metal decreases. EAF (electric arc steel melting furnace) with independently powered arcs, eliminating its electromagnetic blowing is proposed. When arcs are powered independently, its efficiency increases significantly, and specific energy consumption decreases.
Highlights
Power consumption in electro-arc-steel melting furnaces (EAFs) may be reduced by the increase in the arc efficiency of furnaces
In [8] we proposed an analytical method to determine the average angular radiation coefficients (ARCs) of arcs for the metal bath in EAF at which this bath including the depression in the metal, is divided into elementary areas for which local and by summarizing average ARCs are determined for the metal bath
For an arc fully hidden in a metal and slag, 33% of the arc power is radiated to the free space, absorbed by furnace gases and the water of the wall and roof panels, and is removed from the furnace as losses because of electromagnetic blowing
Summary
Power consumption in EAF may be reduced by the increase in the arc efficiency of furnaces. Calculations show that if we are to increase the arc efficiency and reduce the power consumption, we need to eliminate electromagnetic arc blowing. In dc arc-steel melting furnaces with one roof electrode the arc glows vertically between electrode and metal bath at liquid stages of melting. In dc arc-steel melting furnaces the current doesn’t break and flows vertically in this way: roof electrode-electric arc-metal bath-bottom electrode. Since arc current breaks at 90 ̊, electromagnetic buoyancy acts on electric. (2014) Electromagnetism and the Arc Efficiency of Electric Arc Steel Melting Furnaces. Arc is blown out toward furnace wall by the action of electromagnetic buoyancy, its heat radiation on the wall increases and decreases on the metal, arc efficiency decreases. Since 90% of electric steel is made in EAF and 10% in dc EAF, it is very important to eliminate electromagnetic buoyancy in EAF
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