Title:
BLAST FURNACE OPERATION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/153407
Kind Code:
A1
Abstract:
Since blast furnace gas discharged from a blast furnace contains a large amount of CO gas that did not contribute to ore reduction, blast furnace gas containing unused CO gas is again blown into the blast furnace through blast furnace tuyeres to reduce carbon oxides discharged from the blast furnace. If CO2 is removed from the blast furnace gas containing unused CO gas, and CO gas removed of CO2 is blown into the blast furnace again, nitrogen accumulates in the blast furnace, and O2 should be blown in instead of air blowing. Then, since there is no nitrogen in front of the tuyeres, the amount of gas generated in front of the tuyeres is insufficient, the temperature in front of the tuyeres rises, and it becomes difficult to operate the blast furnace. According to the present invention, N2 gas or CO2 gas is blown and circulated along with CO gas blown from the tuyeres.
Inventors:
TOKUNAGA MASAAKI (JP)
Application Number:
PCT/JP2023/004031
Publication Date:
August 17, 2023
Filing Date:
February 07, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21B5/00; C21B5/06; C21B7/00; F27D17/00
Foreign References:
| JP2015129325A | 2015-07-16 | |||
| JP2010275582A | 2010-12-09 | |||
| JP2020176318A | 2020-10-29 |
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
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