| 摘要 |
PROBLEM TO BE SOLVED: To perform pressurization of a hot stove while keeping blasting pressure into a blast furnace at a fixed level without being affected by variation of an operating level and unevenness of increased blast amount in an air blower, etc., when the pressure is filled into a hot stove by increasing the blasting pressure. SOLUTION: When the pressure is to be applied by opening a pressurizing valve 17 in the hot stove 15 to be blasted at the next time during blasting by opening a blasting system control valve 16 to the blast furnace 11 from either one of the hot stoves 15 at the starting time of pressurization when the blasting amount is increased in the air blower 14 to fill the pressure in the hot stove 15, the blasting pressure just before the starting time is memorized into a computing element as a stetting value. Thereafter, a pressure control valve 13 is driven with a control output calculated so as to compensate the deviation between the setting value and the actual blasting pressure measured with a pressure detector 12. In this way, the hot stove can be pressurized while keeping the blasting pressure into the blast furnace to a fixed level by increasing/decreasing the blasting amount used at the pressurized side.
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