OPERATION METHOD FOR HOT STOVE

PROBLEM TO BE SOLVED: To make hot wind to be sent to a blast furnace constant without degrading furnace conditions in spite of the occurrence of the blow-by of the blast furnace by controlling an air quantity from the time the in-furnace pressures of both of a preceding hot stove and a succeeding hot stove which send the hot wind to the blast furnace coincide. SOLUTION: The in-furnace pressures of the first to third hot stoves connected to the blast furnace are detected at all times by respective in-furnace pressure sensors 30 to 32. A valve disposed at the first hot stove is operated to be opened and closed to blast the hot wind from the first hot stove to the blast furnace when the combustion of the first hot stove ends and the changeover of the first and second hot stoves starts. At the time of executing the changeover operation, the operation is executed by changing the blast control to the press control. The blasting is executed by changing over the control of the hot wind to be sent to the blast furnace from the blasting pressure control to the blast flow rate control from the point of the time the in-furnace pressure of the first hot stove for blasting by ending the heat accumulation in order to blast the hot wind to the blast furnace succeeding to the in-furnace pressure is equalized when the blasting of the preceding second hot stove sending the hot wind to the blast furnace nearly ends.