| 摘要 |
PROBLEM TO BE SOLVED: To maintain the temperature of a molten slag layer at a set value, by adjusting the setting of supply electric power or voltage and electric current to a melting furnace main body according to the liquid level of a molten metal layer inside a molten bath. SOLUTION: A supply electric power arithmetic and logic unit 23 is provided with a setting part for setting the rising rates of the liquid levels Lm of a plurality of molten metal layers M that can be preset and a setting part for setting supply electric power values corresponding thereto. In the case of the operation of an electric melting furnace, the rising rate of the liquid level Lm of the molten metal layer M and the supply electric power value corresponding thereto are conveniently selected and set according to the properties and the supplying amount of a substance to be melted A. In this way, the increased and decreased values of the supply electric power are operated by comparing the rising rate of the liquid level Lm of the set molten metal layer M with the preset standard rising rate, and the increased and decreased values of the supply power are output to a plasma control panel 24 as a supply electric power command signal Qw.
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