Monitoring system for annular scrubbers
US-10155195-B2 · Dec 18, 2018 · US
Blast furnace operation method
US2025179593A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025179593-A1 |
| Application number | US-202318836896-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 7, 2023 |
| Priority date | Feb 8, 2022 |
| Publication date | Jun 5, 2025 |
| Grant date | — |
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Abstract
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When CO 2 is removed from a blast furnace gas containing unused CO gas and CO gas after removing CO 2 is again injected into a blast furnace, nitrogen accumulates in the blast furnace. O 2 is thus injected instead of blast. This causes the absence of nitrogen in front of a tuyere, so that a volume of gas generated in front of the tuyere is insufficient and a temperature in front of the tuyere rises, resulting in a difficulty in the blast furnace operation. N 2 gas or CO 2 gas is thus injected together with the CO gas injected through the tuyere, and circulated.
First claim
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1 - 6 . (canceled) 7 . A blast furnace operation method comprising: injecting O 2 gas through a tuyere of a blast furnace in place of air blast; separating and removing CO 2 from a blast furnace gas discharged from a furnace top of the blast furnace; and injecting all of CO gas after removing CO 2 through the tuyere of the blast furnace, wherein all of N 2 gas, which is injected through the tuyere of the blast furnace and discharged from the furnace top of the blast furnace together with the CO gas after removing CO 2 , is circulated within the blast furnace to make a N 2 circulation amount in the blast furnace constant. 8 . A blast furnace operation method comprising: injecting O 2 gas through a tuyere of a blast furnace in place of air blast; separating and removing CO 2 from a blast furnace gas discharged from a furnace top of the blast furnace; and injecting a part of CO gas after removing CO 2 through the tuyere of the blast furnace, wherein N 2 gas, which is injected through the tuyere of the blast furnace and discharged from the furnace top of the blast furnace together with the part of the CO gas after removing CO 2 , is circulated within the blast furnace to make a N 2 circulation amount in the blast furnace constant. 9 . The blast furnace operation method according to claim 7 , wherein an H 2 gas is injected through the tuyere of the blast furnace and the CO gas after removing CO 2 comprises the H 2 gas. 10 . A blast furnace operation method comprising: injecting O 2 gas through a tuyere of a blast furnace in place of air blast; separating and removing CO 2 from a part of a blast furnace gas discharged from a furnace top of the blast furnace to produce a CO gas; and injecting, through the tuyere of the blast furnace, all of the CO gas after removing CO 2 together with a rest of the blast furnace gas not separating and removing CO 2 from the blast furnace gas discharged from the furnace top of the blast furnace to make a CO 2 circulation amount in the blast furnace constant. 11 . A blast furnace operation method comprising: injecting O 2 gas through a tuyere of a blast furnace in place of air blast; separating and removing CO 2 from a part of a blast furnace gas discharged from a furnace top of the blast furnace to produce a CO gas; and injecting, through the tuyere of the blast furnace, a part of the CO gas after removing CO 2 together with a rest of the blast furnace gas not separating and removing CO 2 from the blast furnace gas discharged from the furnace top of the blast furnace to make a CO 2 circulation amount in the blast furnace constant. 12 . The blast furnace operation method according to claim 10 , wherein an H 2 gas is injected through the tuyere of the blast furnace and the CO gas after removing CO 2 comprises the H 2 gas. 13 . The blast furnace operation method according to claim 8 , wherein an H 2 gas is injected through the tuyere of the blast furnace and the CO gas after removing CO 2 comprises the H 2 gas. 14 . The blast furnace operation method according to claim 11 , wherein an H 2 gas is injected through the tuyere of the blast furnace and the CO gas after removing CO 2 comprises the H 2 gas.
Assignees
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Classifications
Tuyéres · CPC title
of carbon dioxide · CPC title
by adding additional fuel in recirculation pipes · CPC title
Selection or treatment of the reducing gases · CPC title
Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases · CPC title
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- What does patent US2025179593A1 cover?
- When CO 2 is removed from a blast furnace gas containing unused CO gas and CO gas after removing CO 2 is again injected into a blast furnace, nitrogen accumulates in the blast furnace. O 2 is thus injected instead of blast. This causes the absence of nitrogen in front of a tuyere, so that a volume of gas generated in front of the tuyere is insufficient and a temperature in front of the tuyer…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21B7/002. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jun 05 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).