A method of manufacturing of a steel product in several steelmaking units
US-2024132984-A1 · Apr 25, 2024 · US
Method for producing reduced iron
US2023167517A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023167517-A1 |
| Application number | US-202117921745-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 14, 2021 |
| Priority date | May 28, 2020 |
| Publication date | Jun 1, 2023 |
| Grant date | — |
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Abstract
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A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, in which a heated gas mixture which contains a reducing gas and a nitrogen gas, the reducing gas containing 90 volume % or more of a hydrogen gas, is blown into the shaft furnace from a tuyere equipped at a lower portion of a reduction zone of the shaft furnace, at least part of the reducing gas is blown into a cooling zone of the reduced iron provided at a lower portion of the shaft furnace at normal temperature, and the reducing gas that has flowed up in the cooling zone is used for reduction of the iron oxide.
First claim
Opening claim text (preview).
1 . A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, wherein a heated gas mixture which contains a reducing gas and a nitrogen gas, the reducing gas containing 90 volume % or more of a hydrogen gas, is blown into the shaft furnace from a tuyere equipped at a lower portion of a reduction zone of the shaft furnace, and at least part of the reducing gas is blown into a cooling zone of the reduced iron provided at a lower portion of the shaft furnace at normal temperature, and the reducing gas that has flowed up in the cooling zone is used for reduction of the iron oxide. 2 . The method for producing reduced iron according to claim 1 , the method comprising: separating and collecting at least unreacted hydrogen gas and nitrogen gas from a furnace top gas of the shaft furnace; and reusing the separated and collected hydrogen gas and nitrogen gas as part of the gas mixture. 3 . A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, wherein a heated gas mixture which contains a reducing gas and a nitrogen gas, the reducing gas containing 90 volume % or more of a hydrogen gas, is blown into the shaft furnace, and an ammonia gas is blown into a cooling zone of the reduced iron provided at a lower portion of the shaft furnace at normal temperature, and a hydrogen gas and a nitrogen gas generated by decomposition of the ammonia gas while flowing up in the cooling zone are used as part of the gas mixture. 4 . The method for producing reduced iron according to claim 3 , the method comprising: separating and collecting at least unreacted hydrogen gas and nitrogen gas from a furnace top gas of the shaft furnace; and reusing part of the separated and collected hydrogen gas and nitrogen gas as part of the gas mixture and using a rest as a fuel gas at a time of heating the gas mixture.
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in shaft furnaces · CPC title
Controlling the physical properties of the gas, e.g. pressure or temperature · CPC title
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by adding additional fuel in recirculation pipes · CPC title
Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases · CPC title
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- What does patent US2023167517A1 cover?
- A method for producing reduced iron that produces reduced iron by reducing iron oxide charged in a shaft furnace, in which a heated gas mixture which contains a reducing gas and a nitrogen gas, the reducing gas containing 90 volume % or more of a hydrogen gas, is blown into the shaft furnace from a tuyere equipped at a lower portion of a reduction zone of the shaft furnace, at least part of the…
- Who is the assignee on this patent?
- Nippon Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21B13/0073. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jun 01 2023 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).