| 摘要 |
PROBLEM TO BE SOLVED: To operate a blast furnace without giving an adverse effect to the operation, by varying a flow rate of pulverized coal in a distribution branch pipe in response to the increase or decrease of the flow rate of blast in a leg pipe. SOLUTION: The method for operating the blast furnace while blowing the pulverized coal distributed to the respective distribution branch pipes using a pulverized coal distribution flow control device, from a tuyere together with hot blast comprises the steps of: (i) measuring the blast flow rate and the pulverized coal flow rate in the respective tuyeres, and measuring one or more temperatures of a blast furnace bottom, molten pig iron, slag and a stave, and/or a falling rate of a charged material, at a periphery of a blast furnace bottom around the respective tuyeres; (ii)(a) reducing the blast flow rate and the pulverized coal flow rate according to the reduced rate, in a tuyere at which one or more temperatures of the above sites and/or the falling rate of the charged material are higher than standard values for control; and (b) adjusting the blast flow rate to the average flow rate of the blast flow rates through the respective tuyeres and individually control the pulverized coal flow rate in the tuyere, at a tuyere in which one or more temperatures among the above temperatures and/or the falling rate of the charged material are lower than the standard values for control. COPYRIGHT: (C)2007,JPO&INPIT
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