| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the desired injection quantity can not be obtained when a calibration curve for deciding a targeted value for inner pressure in a tank corresponding to the injection quantity of fine powdery coal is used beyond the actual total pressure loss. SOLUTION: When the fine powdery coal in the pressurized tank 7 is injected into a blast furnace 1 by supplying the pressurized gas into the pressurized tank 7 for storing the fine powdery coal; in a control method, with which the calibration curve, as a function of the relation between the targeted fine powdery coal quantity and the pressure loss from the pressurizing tank 7 to the blast furnace 1, is set and the pressure loss amount is obtained from this calibration curve and the targeted fine powdery coal quantity, and the pressurizing tank pressure is adjusted to a value adding the pressure in the furnace near a tuyere to the obtained pressure loss amount, the pressure loss value from the pressurizing tank 7 to the blast furnace 1 is obtained at the pre-setting timing during injecting the fine powdery coal into the blast furnace 1. Then, when this obtained pressure loss value is out of the pre-setting range and generates this value continuously for the number of times of the pre-set number or more, the average value of the pressure loss value continuously generated is obtained, and the above calibration curve is renewed by parallel shifting to the position passing this obtained average pressure loss value and the point of the injection targeted fine powdery coal quantity at this time. COPYRIGHT: (C)2008,JPO&INPIT
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