WO2021230307A1 - 還元鉄の製造方法 - Google Patents

還元鉄の製造方法 Download PDF

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Publication number
WO2021230307A1
WO2021230307A1 PCT/JP2021/018156 JP2021018156W WO2021230307A1 WO 2021230307 A1 WO2021230307 A1 WO 2021230307A1 JP 2021018156 W JP2021018156 W JP 2021018156W WO 2021230307 A1 WO2021230307 A1 WO 2021230307A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
reducing
shaft furnace
nitrogen gas
nitrogen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/018156
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隆信 稲田
守利 水谷
優 宇治澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AU2021272824A priority Critical patent/AU2021272824B2/en
Priority to US17/921,654 priority patent/US12486548B2/en
Priority to JP2022522188A priority patent/JP7575697B2/ja
Priority to EP21804039.2A priority patent/EP4151754A4/en
Priority to MX2022014023A priority patent/MX2022014023A/es
Priority to CA3176131A priority patent/CA3176131A1/en
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to BR112022021572A priority patent/BR112022021572A2/pt
Priority to KR1020227038898A priority patent/KR20220160694A/ko
Priority to CN202180034277.4A priority patent/CN115552041A/zh
Publication of WO2021230307A1 publication Critical patent/WO2021230307A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024091753A priority patent/JP2024113093A/ja
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/16—Arrangements of tuyeres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/22—Increasing the gas reduction potential of recycled exhaust gases by reforming
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Definitions

  • the method for producing reduced iron using a shaft furnace is a representative of the direct reduction process for producing reduced iron from iron oxide raw materials, mainly in areas (oil-producing countries) where natural gas can be obtained at low cost. It is widespread.
  • the iron oxide raw material for example, iron oxide pellets
  • the reducing gas 300 is blown from below the shaft furnace 100.
  • the reducing gas is heated to a predetermined temperature (for example, about 900 to 950 ° C.) and then blown into the shaft furnace 100.
  • Table 1 shows the preconditions (calculation conditions) provided for the case study. In light of the purpose of evaluating macroscopic heat and mass transfer, this calculation condition was set based on typical operating conditions so that the generality of the results would not be impaired.
  • the calculation target of the mathematical model was the space corresponding to the reduction reaction zone of the shaft furnace.
  • it is a method for producing reduced iron by reducing iron oxide charged in a shaft furnace, wherein the reduced iron contains 90% by volume or more of hydrogen gas.
  • a method for producing reduced iron which comprises a step of heating a mixed gas containing nitrogen gas and a step of blowing the heated mixed gas into a shaft furnace.
  • a step of separating and recovering at least unreacted hydrogen gas and nitrogen gas from the top gas of the shaft furnace and a step of reusing the separated and recovered hydrogen gas and nitrogen gas as a part of the mixed gas are included. You may go out.
  • the reducing gas intensity can be reduced even when a reducing gas containing a high concentration of hydrogen gas is used.
  • FIG. 2 shows the relationship between the blowing temperature (° C.) of the mixed gas 30 and the hydrogen gas intensity (Nm 3 / t—Fe) for each addition amount of the nitrogen gas 32.
  • Graph L1 shows the above relationship when nitrogen gas is not added
  • graph L2 shows the above relationship when nitrogen gas is added to the reducing gas 31 at 250 Nm 3 / t-Fe
  • graph L3 shows the relationship where nitrogen gas is added to the reduced gas 31 at 500 Nm 3.
  • the above relationship when / t-Fe is added is shown. Therefore, the graphs L2 and L3 correspond to the shaft furnace operation according to the first embodiment. Since the hydrogen gas concentration of the reducing gas 31 is 100% by volume here, the hydrogen gas basic unit can be read as the reduced gas basic unit.
  • the blowing temperatures of these graphs are 800 ° C., 840 ° C., 860 ° C., 880 ° C., 900 ° C., 920 ° C., 940 ° C., 960 ° C., 980 ° C., 1000 ° C., 1020 ° C., 1050 ° C., 1100 ° C. from the top. ing.
  • the furnace top gas 40 is introduced into the separation / recovery device 60, and the top gas 40 is cooled in the separation / recovery device 60.
  • the furnace top gas 40 is dust-removed.
  • water vapor is removed from the furnace top gas 40 as water 65, and unreacted hydrogen gas 31a and nitrogen gas 32 are separated and recovered as circulating gas 70.
  • the reducing gas 31 contains a reducing gas (CO or the like) other than hydrogen gas
  • the circulating gas 70 may contain an oxide of the reducing gas (CO 2 or the like) in addition to the unreacted reducing gas.
  • the circulating gas 70 contains these gases, there is no operational problem.
  • the process flow of the method for producing reduced iron (shaft furnace operation) according to the second embodiment will be described with reference to FIG. 7.
  • the second embodiment also contains the reducing gas 31 containing 90% by volume or more of hydrogen gas and the nitrogen gas 32, and blows the mixed gas 30 at a predetermined temperature into the shaft furnace 100. That is.
  • the method for producing reduced iron according to the second embodiment is different from the first embodiment in that the reducing gas 31 and the nitrogen gas 32 are individually heated and then mixed.
  • a step of individually heating the reducing gas 31 and the nitrogen gas 32 and a mixing of the heated reduced gas 31 and the nitrogen gas 32 are performed.
  • the steps other than these may be the same as those of the existing shaft furnace operation.
  • the heated reduction gas 31 and the nitrogen gas 32 are mixed in the mixing section 55 (for example, the confluence portion between the piping of the reduction gas 31 and the piping of the nitrogen gas 32). That is, the heated nitrogen gas 32 is added to the heated reducing gas 31. As a result, the mixed gas 30 having a predetermined temperature is produced. Then, the mixed gas 30 is blown into the shaft furnace 10. Subsequent steps are the same as in the first embodiment. Therefore, the heating temperature of the reducing gas 31 and the nitrogen gas 32 is adjusted so that the temperature of the mixed gas 30 after mixing becomes a predetermined temperature.
  • the predetermined temperature is preferably 900 ° C. or lower as described above.
  • the lower limit of the predetermined temperature is not particularly limited as long as the shaft furnace can be operated according to the second embodiment, but may be, for example, about 750 ° C.
  • the amount of nitrogen gas 32 added is set to 330 Nm 3 / t-Fe to generate a hydrogen gas source.
  • the blowing temperature of the mixed gas 30 can be reduced to 900 ° C. without increasing the unit (point P2).
  • the reducing gas 31 and the nitrogen gas 32 are individually heated, and the heating temperature of the nitrogen gas 32 is raised to about 1350 ° C. to raise the heating temperature of the reducing gas 31 to about 800 ° C. It can be reduced (point P3).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Iron (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Control And Safety Of Cranes (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Compounds Of Iron (AREA)
PCT/JP2021/018156 2020-05-14 2021-05-13 還元鉄の製造方法 Ceased WO2021230307A1 (ja)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BR112022021572A BR112022021572A2 (pt) 2020-05-14 2021-05-13 Método para produzir ferro reduzido
US17/921,654 US12486548B2 (en) 2020-05-14 2021-05-13 Method for producing reduced iron
JP2022522188A JP7575697B2 (ja) 2020-05-14 2021-05-13 還元鉄の製造方法
EP21804039.2A EP4151754A4 (en) 2020-05-14 2021-05-13 PROCESS FOR PRODUCING REDUCED IRON
MX2022014023A MX2022014023A (es) 2020-05-14 2021-05-13 Metodo para producir hierro reducido.
AU2021272824A AU2021272824B2 (en) 2020-05-14 2021-05-13 Method for producing reduced iron
CN202180034277.4A CN115552041A (zh) 2020-05-14 2021-05-13 还原铁的制造方法
CA3176131A CA3176131A1 (en) 2020-05-14 2021-05-13 Method for producing reduced iron
KR1020227038898A KR20220160694A (ko) 2020-05-14 2021-05-13 환원철의 제조 방법
JP2024091753A JP2024113093A (ja) 2020-05-14 2024-06-05 還元鉄の製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-085078 2020-05-14
JP2020085078 2020-05-14

Publications (1)

Publication Number Publication Date
WO2021230307A1 true WO2021230307A1 (ja) 2021-11-18

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PCT/JP2021/018156 Ceased WO2021230307A1 (ja) 2020-05-14 2021-05-13 還元鉄の製造方法

Country Status (11)

Country Link
US (1) US12486548B2 (https=)
EP (1) EP4151754A4 (https=)
JP (2) JP7575697B2 (https=)
KR (1) KR20220160694A (https=)
CN (1) CN115552041A (https=)
AU (1) AU2021272824B2 (https=)
BR (1) BR112022021572A2 (https=)
CA (1) CA3176131A1 (https=)
MX (1) MX2022014023A (https=)
TW (1) TWI788843B (https=)
WO (1) WO2021230307A1 (https=)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE2250610A1 (en) * 2022-05-20 2023-11-21 Greeniron H2 Ab Method and device for producing direct reduced metal
WO2024018692A1 (ja) 2022-07-21 2024-01-25 住友金属鉱山株式会社 含ニッケル酸化鉱石の製錬方法
WO2025028432A1 (ja) 2023-07-28 2025-02-06 住友金属鉱山株式会社 含ニッケル酸化鉱石の製錬方法
EP4288571B1 (en) 2021-02-03 2025-06-18 HYBRIT Development AB Bleed-off gas recovery in a direct reduction process
WO2025158579A1 (ja) * 2024-01-24 2025-07-31 日本製鉄株式会社 還元鉄の製造方法及びシャフト炉

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN116734616A (zh) * 2023-06-02 2023-09-12 东北大学 一种氢基竖炉炉顶煤气的膜法回收利用装置及方法

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US20170239700A1 (en) 2016-02-23 2017-08-24 Bilstein Gmbh & Co. Kg Method of and apparatus for rolling strip of fluctuating thickness
WO2019238720A1 (de) 2018-06-12 2019-12-19 Primetals Technologies Austria GmbH Herstellung von karburiertem eisenschwamm mittels wasserstoffbasierter direktreduktion
JP2020085078A (ja) 2018-11-20 2020-06-04 Ｋｙｂ株式会社 流体圧制御装置

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WO2019238720A1 (de) 2018-06-12 2019-12-19 Primetals Technologies Austria GmbH Herstellung von karburiertem eisenschwamm mittels wasserstoffbasierter direktreduktion
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JP2020085078A (ja) 2018-11-20 2020-06-04 Ｋｙｂ株式会社 流体圧制御装置

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YAMAOKA ET AL., TETSU-TO-HAGANE, vol. 74, 1988, pages 2254

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4288571B1 (en) 2021-02-03 2025-06-18 HYBRIT Development AB Bleed-off gas recovery in a direct reduction process
SE2250610A1 (en) * 2022-05-20 2023-11-21 Greeniron H2 Ab Method and device for producing direct reduced metal
WO2023224541A1 (en) * 2022-05-20 2023-11-23 Greeniron H2 Ab Method and device for producing direct reduced metal
SE545792C2 (en) * 2022-05-20 2024-02-06 Greeniron H2 Ab Method and device for producing direct reduced metal
WO2024018692A1 (ja) 2022-07-21 2024-01-25 住友金属鉱山株式会社 含ニッケル酸化鉱石の製錬方法
KR20250025468A (ko) 2022-07-21 2025-02-21 스미토모 긴조쿠 고잔 가부시키가이샤 니켈 함유 산화광석의 제련 방법
WO2025028432A1 (ja) 2023-07-28 2025-02-06 住友金属鉱山株式会社 含ニッケル酸化鉱石の製錬方法
WO2025158579A1 (ja) * 2024-01-24 2025-07-31 日本製鉄株式会社 還元鉄の製造方法及びシャフト炉
JP7737064B1 (ja) * 2024-01-24 2025-09-10 日本製鉄株式会社 還元鉄の製造方法及びシャフト炉

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BR112022021572A2 (pt) 2022-12-06
AU2021272824B2 (en) 2024-10-03
KR20220160694A (ko) 2022-12-06
EP4151754A4 (en) 2023-09-13
JP2024113093A (ja) 2024-08-21
JP7575697B2 (ja) 2024-10-30
JPWO2021230307A1 (https=) 2021-11-18
US12486548B2 (en) 2025-12-02
CN115552041A (zh) 2022-12-30
EP4151754A1 (en) 2023-03-22
TWI788843B (zh) 2023-01-01
TW202146667A (zh) 2021-12-16
CA3176131A1 (en) 2021-11-18
MX2022014023A (es) 2022-11-30
US20230167516A1 (en) 2023-06-01
AU2021272824A1 (en) 2022-11-24

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