FURNACE TEMPERATURE SETTING METHOD AND FURNACE TEMPERATURE CONTROL METHOD FOR CONTINUOUS HEATING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a furnace temperature setting method and a furnace temperature control method for a continuous heating furnace that achieve a target metallization rate with a minimum necessary amount of heat applied to the continuous heating furnace which heats a raw material mounted to a moving furnace floor by a burner to perform reduction treatment.

SOLUTION: A space from a charging hole to a discharge hole of the continuous heating furnace is divided into zones. A furnace temperature is assumed at each zone and a plurality of furnace temperature patterns are set. A metallization rate αOUTat the discharge hole is calculated at each furnace temperature pattern using time functions of the metallization rate α and the carbon content rate β of the raw material calculated in advance using a test and the like. The necessary amount of heat applied to the continuous heating furnace is calculated for the furnace temperature patterns in which the calculated metallization rate αOUTis larger than or equal to a target value. The furnace temperature pattern which realizes the minimum necessary amount of heat applied among calculated necessary amounts of heat applied is set as the optimal furnace temperature pattern. Fuel supplied to a burner of the continuous heating furnace is controlled on the basis of the optimal furnace temperature pattern.

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