WO2000047780A2 - Procede et appareil pour prechauffer du fer de reduction directe utilise pour alimenter un four a arc electrique - Google Patents

Procede et appareil pour prechauffer du fer de reduction directe utilise pour alimenter un four a arc electrique Download PDF

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Publication number
WO2000047780A2
WO2000047780A2 PCT/IB2000/000607 IB0000607W WO0047780A2 WO 2000047780 A2 WO2000047780 A2 WO 2000047780A2 IB 0000607 W IB0000607 W IB 0000607W WO 0047780 A2 WO0047780 A2 WO 0047780A2
Authority
WO
WIPO (PCT)
Prior art keywords
dri
gas
vessel
oxidizing
metallurgical furnace
Prior art date
Application number
PCT/IB2000/000607
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English (en)
Other versions
WO2000047780A3 (fr
Inventor
Juan A. Villarreal-Trevino
Original Assignee
Hylsa, S.A. De C.V.
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
Application filed by Hylsa, S.A. De C.V. filed Critical Hylsa, S.A. De C.V.
Priority to AU41391/00A priority Critical patent/AU4139100A/en
Publication of WO2000047780A2 publication Critical patent/WO2000047780A2/fr
Publication of WO2000047780A3 publication Critical patent/WO2000047780A3/fr

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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
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • 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

Definitions

  • the present invention relates to a method and apparatus for preheating direct reduced iron, DRI (sometimes called sponge iron), or the like, used as feed material for a metallurgical furnace, typically an electric arc furnace.
  • DRI sometimes called sponge iron
  • a hot inert, reducing, or carburizing atmosphere is used prior to charging the materials to the electric arc furnace (EAF).
  • the present invention describes an improvement in steelmaking processes, specifically an improved method and apparatus for preheating the direct reduced iron (DRI), sponge iron, or the like, fed to an EAF.
  • DRI direct reduced iron
  • U.S. Patent No. 4,642,048 to Kim shows utilization of the heating potential of the effluent gas from the EAF to preheat DRI as the feed material, but does not address the problem of re-oxidation that occurs from exposing the DRI to the hot oxidizing EAF effluent gas.
  • U.S. Patent No. 3,163,520 to Collin et al. discloses a process wherein a non- oxidizing gas is used for preheating a charge of iron ore and a carbonaceous material such as coke or coal. Even though the Collin teaches that this process can be advantageously used for preheating the charge without any or negligible pre- reduction, the object of the process is to provide the heat for increasing the temperature of the ore pellets and to supply the heat of reduction that will take place in a further step as in an electric pig-iron furnace or in an EAF.
  • the EAF charge is not iron ore, but DRI with a degree of metallization of at least 85%, thus a further reduction of the charge is not intended to be performed in the melting furnace.
  • the present invention has the advantage of using a reducing or inert atmosphere to preheat the DRI, avoiding the re-oxidation of the feeding charge and achieving a more cost-effective way to produce steel, such as by reducing the electric demand in an electric arc furnace (using instead a less expensive heat source for at least the initial heating) and even more importantly, decreasing the heating time and the overall tap-to-tap time thereby increasing the productivity of the EAF.
  • the present invention describes a method for producing steel in a metallurgical furnace, more specifically a method for preheating and carburizing direct reduced iron (DRI), sponge iron, or the like with a non-oxidizing gas and feeding said preheated material to a metallurgical furnace.
  • DRI direct reduced iron
  • the method herein described comprises charging the DRI at ambient temperature to a container or heating vessel, contacting a non-oxidizing and preferably carburizing gas stream at a high temperature with the DRI. After the DRI has reached a desired temperature, it is discharged and fed to said furnace.
  • This method can be performed in a continuous or batch wise mode, preferably in the continuous mode.
  • the preferred embodiment of the invention comprises the preheating of said DRI with a hot non-oxidizing gas; which may be of a reducing and/or of a carburizing nature, or also may be an inert gas (like nitrogen) or a hydrocarbon-containing gas (such natural gas).
  • a hot non-oxidizing gas which may be of a reducing and/or of a carburizing nature, or also may be an inert gas (like nitrogen) or a hydrocarbon-containing gas (such natural gas).
  • a hot non-oxidizing gas which may be of a reducing and/or of a carburizing nature, or also may be an inert gas (like nitrogen) or a hydrocarbon-containing gas (such natural gas).
  • a hot non-oxidizing gas which may be of a reducing and/or of a carburizing nature, or also may be an inert gas (like nitrogen) or a hydrocarbon-containing gas (such natural gas).
  • One of the preferred embodiments of the present invention comprises maintaining the preheating system
  • the DRI having at least a metallization of 85% and a temperature lower than the desired feeding temperature to the EAF is fed to a heating vessel, that can be in the form of a hopper or a vertical shaft, and is contacted with a stream of hot non- oxidizing and/or carburizing gas within said vessel to increase the temperature of the DRI to the desired feeding temperature of the DRI to the EAF.
  • a heating vessel that can be in the form of a hopper or a vertical shaft, and is contacted with a stream of hot non- oxidizing and/or carburizing gas within said vessel to increase the temperature of the DRI to the desired feeding temperature of the DRI to the EAF.
  • the preheating is continuous, the DRI flows downwardly through the vessel preferably with the hot gas flowing counter-currently.
  • one or more hoppers and conduit means could be used to feed it through the roof of said furnace.
  • one or more screw feeders can be used for this purpose.
  • the metallurgical furnace is most commonly an electric arc
  • the non-oxidizing gas is preferably a reducing and/or carburizing gas, which is produced by a suitable a source and then is heated to a temperature in the range of about 400°C to about 1000°C, but it is to be understood that the higher the temperature the more beneficial is the utilization of the present invention.
  • the reducing gas is preferred to comprise hydrogen, carbon monoxide and methane as its main components. This reducing gas can be produced by the reformation of natural gas with heat and steam, by coal gasification, by partial combustion, or by other methods known in the art, such as the thermal cracking of natural gas.
  • Figure 1 shows a preferred embodiment of the present invention.
  • Figure 2 shows basically the embodiment illustrated in figure 1, but in lieu of lock hoppers, instead combines two valve-isolated preheating units which share the same source of hot gas.
  • Direct reduced iron (DRI), sponge iron, briquettes (HBI), or the like is fed as stream 10 at ambient temperature in a manner known in the art to an optionally open hopper 12.
  • the DRI passes through a valve means 14 to a closed hopper 16, which is able to be pressurized, and then passes through valve 18 to preheater 20.
  • the combination of the valve 14, hopper 16 and valve 18 forms the first lock hopper means. See U.S. Patent Nos. 3,710,808 and 4,498,498.
  • a hot inert, reducing or carburizing gas is injected as stream 44 into preheater 20, where it passes through the bed of DRI to be pre-heated.
  • the gas stream exits the preheater 20 as an exhaust gas stream 22, then passes through the cooling and cleaning system 24, typically a water quench cooler, forming the cleaned gas stream 26.
  • the clean gas stream 26 passes through compressing means 28 and forms the pressurized gas stream 30.
  • Nitrogen, natural gas, carbon monoxide, hydrogen, combinations thereof or another suitable gas is fed as make-up gas 34 from a suitable source 32.
  • Make-up gas 34 is combined with said pressurized gas 30 to form stream 36, which passes through heater 38 to form said the hot inert, reducing or carburizing gas 44.
  • Heater 38 is supplied with a suitable combustible gas 40 through burner 42.
  • the fumes produced by the EAF 70 can be quenched (removing water therefrom), and the resulting cooled gas fed to the same burner 42.
  • the hot DRI is discharged through discharging means 50 and valve means 52, into hopper 54 (which with valves means 52 and 56 forms a system to pressurize and de- pressurize the discharge hopper 54 as the second lock hopper means).
  • the pressure of the system can be from atmospheric pressure to about 3 Kg/cm but it can be performed at higher pressure depending on the economic factors that exist in a predetermined facility. If it is desired that the operating pressure is near the atmospheric pressure, the charge and discharge system can be greatly simplified by gas seals or other means as best suited to the operating conditions.
  • the stream of hot DRI passing through valve 56 can be split to feed into two or more hoppers 60 and 64 respectively via conduit means 62 and 66 so as to be fed to different areas in the electric arc furnace 70; or could be introduced through screw feeder 68 through the walls of the EAF 70. See U.S. Patent No. 5,218,617.
  • the two preheater units 100 and 100A are alternately pressurized so that lock hopper feed and discharge combinations are not needed. Instead, while the direct reduced iron is being heated in preheater 100 A by a hot gas flow therethrough, the preheater 100 is fed from an optionally open accumulating hopper 94 via an open isolating feed valve 96 as stream 98, and after first being discharged as stream 104 via a discharging-isolating valve 102 means or combination. Meanwhile, the direct reduced iron already charged into preheater vessel 100 A is isolated by closed valves 96 and 102 and heated by gas flowing in via the open valve in stream 46 and out through the open valve in stream 22.
  • valves for streams 22 A and 46 A are closed so that it can be pressurized by opening the valves of gas streams 22 and 46.
  • Vessel 100A can then be depressurized and discharged via discharging valve means 102 A and then recharged via open valve 96A. It will be recognized that since preheater 100 A mirrors preheater 100, the similar attachments of the one are identified by the same relative reference numbers as used in connection with the other, but differentiated by the addition of "A" to the respective reference numbers.
  • one embodiment of the present invention could feed hot DRI to one, two, or more metallurgical furnaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Cette invention concerne un procédé et un appareil pour préchauffer du fer de réduction directe (DRI) avant son introduction dans un four métallurgique tel qu'un four à arc électrique. Ce procédé consiste à mettre en contact le DRI avec un gaz non oxydant, réducteur ou de cémentation, à une température élevée. La présente invention concerne également un moyen permettant de réduire la demande électrique à l'intérieur du four (par l'utilisation d'une source de chaleur moins coûteuse) et, plus important encore, permettant de réduire l'intervalle entre deux coulées et donc d'améliorer la productivité du four de fusion. Eventuellement, l'invention peut être exploitée pour également augmenter la teneur en carbone du DRI à charger.
PCT/IB2000/000607 1999-02-02 2000-02-01 Procede et appareil pour prechauffer du fer de reduction directe utilise pour alimenter un four a arc electrique WO2000047780A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41391/00A AU4139100A (en) 1999-02-02 2000-02-01 Method and apparatus for preheating of direct reduced iron used as feed to an electric arc furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11828999P 1999-02-02 1999-02-02
US60/118,289 1999-02-02

Publications (2)

Publication Number Publication Date
WO2000047780A2 true WO2000047780A2 (fr) 2000-08-17
WO2000047780A3 WO2000047780A3 (fr) 2001-07-26

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AU (1) AU4139100A (fr)
WO (1) WO2000047780A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007076896A1 (fr) 2006-01-04 2007-07-12 Saarstahl Ag Procede et prechauffage d'un agglomerat ferreux
CN114410873A (zh) * 2021-12-28 2022-04-29 东北大学 基于微波预热含铁炉料的纯氢竖炉炼铁装置及其炼铁方法
US11479829B2 (en) * 2016-10-24 2022-10-25 Technological Resources Pty. Limited Production of iron

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4609400A (en) * 1984-08-02 1986-09-02 Intersteel Technology, Inc. Method and apparatus for preheating charge materials for continuous steelmaking
US4822411A (en) * 1986-05-07 1989-04-18 Voest-Alpine Aktiengesellschaft Integrated steel mill arrangement
US4931090A (en) * 1989-08-23 1990-06-05 Zia Technology, Inc. Pneumatic steelmaking vessel and method of producing steel
US5069716A (en) * 1989-12-22 1991-12-03 C.V.G. Siderurgica Del Orinoco, C.A. Process for the production of liquid steel from iron containing metal oxides
US5400358A (en) * 1992-10-13 1995-03-21 Consteel, S.A. Continuous scrap preheating
US5529599A (en) * 1995-01-20 1996-06-25 Calderon; Albert Method for co-producing fuel and iron
US5588982A (en) * 1995-05-01 1996-12-31 Alabama Power Company Process for producing foudry iron
US5603748A (en) * 1993-06-19 1997-02-18 Lurgi Metallurgie Gmbh Process and apparatus for a direct reduction of iron oxide containing materials to form Fe3 C

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4609400A (en) * 1984-08-02 1986-09-02 Intersteel Technology, Inc. Method and apparatus for preheating charge materials for continuous steelmaking
US4822411A (en) * 1986-05-07 1989-04-18 Voest-Alpine Aktiengesellschaft Integrated steel mill arrangement
US4931090A (en) * 1989-08-23 1990-06-05 Zia Technology, Inc. Pneumatic steelmaking vessel and method of producing steel
US5069716A (en) * 1989-12-22 1991-12-03 C.V.G. Siderurgica Del Orinoco, C.A. Process for the production of liquid steel from iron containing metal oxides
US5400358A (en) * 1992-10-13 1995-03-21 Consteel, S.A. Continuous scrap preheating
US5603748A (en) * 1993-06-19 1997-02-18 Lurgi Metallurgie Gmbh Process and apparatus for a direct reduction of iron oxide containing materials to form Fe3 C
US5529599A (en) * 1995-01-20 1996-06-25 Calderon; Albert Method for co-producing fuel and iron
US5588982A (en) * 1995-05-01 1996-12-31 Alabama Power Company Process for producing foudry iron

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007076896A1 (fr) 2006-01-04 2007-07-12 Saarstahl Ag Procede et prechauffage d'un agglomerat ferreux
CN101184854B (zh) * 2006-01-04 2011-04-13 萨斯特股份公司 用于预热铁结块的方法
US9200338B2 (en) 2006-01-04 2015-12-01 Saarstahl Ag Method for preheating iron agglomerates
US11479829B2 (en) * 2016-10-24 2022-10-25 Technological Resources Pty. Limited Production of iron
US11959153B2 (en) 2016-10-24 2024-04-16 Technological Resources Pty Limited Production of iron
CN114410873A (zh) * 2021-12-28 2022-04-29 东北大学 基于微波预热含铁炉料的纯氢竖炉炼铁装置及其炼铁方法

Also Published As

Publication number Publication date
AU4139100A (en) 2000-08-29
WO2000047780A3 (fr) 2001-07-26

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