| 摘要 |
PURPOSE: A method for penetrating pulverized coal injection line of blast furnace is provided to minimize quality deterioration of hot metal, stabilize blast furnace circumstances and contribute to safety of workers by grasping injection state per pulverized coal injection lines and detecting and penetrating clogged part thereof at once. CONSTITUTION: In a method for penetrating the closed pulverized coal injection line in case that a pulverized coal injection line in pulverized coal injection facilities of blast furnace is clogged, the method for penetrating the pulverized coal injection line of the blast furnace comprises the processes of mounting a nitrogen purge pipe(14) equipped with an automatic nitrogen purge valve(12) at the rear end of pulverized coal supply switch valve(10) on each pulverized coal injection line(110) extended from a distribution valve(100), installing a nitrogen backwash pipe(28) with automatic switch valve(26) in front of an injection lance automatic valve(22) adjacent to pulverized coal injection lance(130), and mounting a pressure sensor(30) on the pulverized coal injection line(110); supplying first nitrogen gas of high pressure to the pulverized coal injection lance(130) from the distribution valve(100) by opening the automatic nitrogen purge valve(12) if pulverized coal is clogged in the pulverized coal injection line(110), and pressure is reduced to a set value or less in the pressure sensor(30); and supplying second nitrogen gas of high pressure to the pulverized coal injection lance(130) through the nitrogen backwash pipe(28) in an opposite direction to the distribution valve(100) side so as to penetrate pulverized coal clogged in the pulverized coal injection line(110) if pulverized coal inside the pulverized coal injection line(110) is not penetrated by supply of the first nitrogen gas.
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