DEVICE FOR PREVENTING BLOWOFF OF BLAST FURNACE AND METHOD FOR PREVENTING BLOWOFF

• Main Author: TOMIOKA KOICHI
• Format: Patent
• Language: English
• Published: 04.02.1997
• Edition: 6
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

PROBLEM TO BE SOLVED: To prevent channeling caused by gap part risen along a furnace wall part by successively arranging a cylindrical body in a through hole arranged in a furnace wall at the shaft part of a blast furnace and arranging a gas pressure exhaust pipe so as to be possible to insert in/pull from the furnace in this cylindrical body. SOLUTION: The through hole 4 passing through a cooling stave 3 at the shaft part of the blast furnace is arranged, and the cylindrical body 5 is successively arranged in the through hole 4. The gas pressure exhaust pipe 6 supported with a driving support rolls 9 and having a gas vent hole 7 is arranged in this cylindrical body 5 so as to be possible to advance/retreat with the driving support roll 9. Further, a shut-off valve 10 is arranged so as to approach the through hole 4 to shut off the through hole 4, and a heat resistant rubber-made seal valve 8 is fitted to the inside of the cylindrical body 5. In this constitution, at the time of detecting the widening of the gap part 20 in the furnace caused by pressure variation in the furnace with a pressure sensor arranged at the tip part of the gas pressure exhaust pipe 6, the shut-off valve 10 is opened and the gas pressure exhaust pipe 6 is inserted into the furnace to exhaust the gas in the furnace and charged material 22 is flowed into the gap part 20 from the surroundings of the gap part 20 to efficiently eliminate the gap part 20.