Title:
BLAST-FURNACE OPERATION METHOD AND BLAST FURNACE
Document Type and Number:
WIPO Patent Application WO/2023/233957
Kind Code:
A1
Abstract:
A blast-furnace operation method and a blast furnace are proposed with which it is possible to smoothly reoperate a blast furnace by preventing the coke from decreasing in diameter due to combustion and consumption and preventing the melt from deteriorating in dischargeability. The blast-furnace operation method is for suspending an operation of a blast furnace to stop the blasting and thereafter restarting blasting, and comprises a combustion step in which after the stopping of blasting, an oxygen-containing gas is blown into the furnace with a burner inserted into the tapping hole to burn the coke remaining in the furnace and reduce the volume of in-furnace residues, a charging step in which coke is newly charged into the volume reduction region, and a blasting step in which blasting through the tuyeres is restarted. The blast-furnace operation method further includes an introduction step in which an inert gas is introduced into the furnace during the period from after the stopping of blasting to before the blasting step.
Inventors:
MASAKI HIDEYA (JP)
OHIRA YASUYOSHI (JP)
FUKUMOTO YASUHIRO (JP)
KIMIYA KOJI (JP)
KAISE TATSUYA (JP)
YOSHIOKA DAIJIROU (JP)
MORIYAMA AKIRA (JP)
OHIRA YASUYOSHI (JP)
FUKUMOTO YASUHIRO (JP)
KIMIYA KOJI (JP)
KAISE TATSUYA (JP)
YOSHIOKA DAIJIROU (JP)
MORIYAMA AKIRA (JP)
Application Number:
PCT/JP2023/017685
Publication Date:
December 07, 2023
Filing Date:
May 11, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21B5/00; C21B7/00
Foreign References:
| JP6947345B1 | 2021-10-13 | |||
| JPS5271307A | 1977-06-14 | |||
| JPS53138913A | 1978-12-04 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
Download PDF: