A method for designing an electrode diameter and a furnace shell shape of a two-phase DC fused magnesia furnace, comprising: designing the structure of the two-phase DC fused magnesia furnace system; calculating an arc power distribution on the surface of a fusing pool under joint effects of a cathode and an anode; determining physical parameters of the two-phase DC fused magnesia furnace system, comprising calculating the electrode diameter; and determining the furnace shell shape according to the arc power distribution on the surface of the fusing pool under the joint effects of the cathode and the anode and the calculated electrode diameter. Analyzing the operating state and electrical configuration of the two-phase DC fused magnesia furnace, enables effective calculation of an electrode diameter and a furnace shell shape that satisfy an optimal operating state of the two-phase DC fused magnesia furnace, thereby effectively reducing the consumption of materials and electrical energy in industrial production processes.
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