PURPOSE:To save manpower in the operation of a furnace and stabilizing the quality of a product based on the stable amount of melting and the stable melting temperature of copper by controlling the melting depending upon a retaining amount and its variations with time. CONSTITUTION:Three or more membership functions from NB(negative big) to PB (positive big) are set at a fuzzy inference section with respect to the deviation E between a desired retaining amount and an actual retaining amount and also the variation DELTAE of the deviation with time, and the variation amount of a combustion level at the time of respective combination is determined. A new combustion level is set by integrating the variation amount determined by the fuzzy inference to the combustion level under actual condition. The combustion level preset by a fold-line function on the basis of the combustion level determined by the fuzzy inference section is converted into an air pressure in each zone according to the relation with the air pressure in each zone. Then, a coefficient that varies stepwise with respect to the melting temperature of copper is set for each zone, and this coefficient is multiplied by the air pressure in each zone, which has been found previously, to make a correction and to set a final burner air pressure.
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