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
  • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B13/00—Making spongy iron or liquid steel, by direct processes
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B13/00—Making spongy iron or liquid steel, by direct processes
  • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
  • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
  • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
• • 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
• • 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
  • C21B13/143—Injection of partially reduced ore into a molten bath
• • 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
  • C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
  • C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
• • 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
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C2100/00—Exhaust gas
  • C21C2100/06—Energy from waste gas used in other processes
• • 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
  • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
• • 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 invention relates to a method for producing molten metal, wherein oxygen, reducing agent and in a reduction reactor reduced iron are introduced into a melter gasifier, the reducing agent gasified with the oxygen and the resulting heat, the reduced iron is melted, the dome gas from the A melt gasifier is used as at least a portion of the reducing gas, and wherein reacted top gas is withdrawn from the reduction reactor, and a plant for carrying out the method, with a reduction reactor, a melt gasifier with oxygen supply and a supply system for reducing agent, at least one conduit for the supply of the dome gas from the melt gasifier into the reduction reactor and at least one line for the removal of the top gas from the reduction reactor.
• blast furnaces various carbonaceous gases, such as natural gas, coke oven gas, etc., are injected via the tuyeres or in the Bosh plane with the background to save coke and increase economy, as already described in GB 883 998 A, for example.
• An injection of blast furnace gas is not economical due to the high CO 2 , N 2 and low H 2 content.
• the coupling of the melter gasifier operation with the reduction reactor results in a fluctuating metallization of the sponge iron of 70-90%.
• a fluctuating metallization of the sponge iron of 70-90%.
• This reduction also sinks Metallization in the fixed bed reduction shaft or fluidized bed reactor, which in turn causes a fall of the Charbett- and dome temperature in the melter gasifier.
• RAFT adiabatic flame temperature
• a particle separator is provided in at least one duct for the dome gas, from the particle discharge of which a particle recirculation leads to the melt gasifier, with a branching from the return duct into the particle recirculation.
• a reduction shaft 1 is of lumpy or pellet-shaped iron ore, optionally supplied with unburned aggregates.
• the sponge iron produced in the reduction shaft 1 is introduced into the head of a melter gasifier 3.
• a melter gasifier 3 At the bottom of the melter gasifier 3, liquid pig iron and above it liquid slag accumulate, which are preferably withdrawn discontinuously via their own taps.
• a gasification agent is supplied to the melter gasifier 3, preferably coal and / or coal briquettes, possibly mixed with screened undersize of the iron ore, which otherwise could not be used for the reduction process.
• an oxygen-containing gas is supplied in the lower region of the melter gasifier 3.
• the reducing gas generated is led out of the head of the melter gasifier 3 via a line 6, freed of solid constituents, in particular dust and fine-grained degassed coal, in a hot gas cyclone 7 and then passes via a line 8 into the reduction shaft 1.
• the reducing gas flows through the Pillar of iron ore and additives in countercurrent, thereby reducing the iron ore to sponge iron.
• the separated in the hot gas cyclone 7 degassed pulverized coal and other particulate ingredients are returned to the melter gasifier 3, preferably on entry into this by arranged in the wall of the melter gasifier 3 dust burner, which also oxygen-containing gas is fed, gasified.
• the at least partially consumed reducing gas is withdrawn at the upper end of the reduction shaft 1 via a top gas line 9 and fed to a laundry in the wet scrubber 10 as export gas due to the excess gas utilization and total energy optimization.
• For reducing the pressure of the system used reducing gas is added after washing in the wet scrubber 11 either the export gas or recycled via line 12 as a cooling gas in the line 6 before the hot gas cyclone 7.
• the top gas to be recycled is behind the wet scrubber 10 via a Line 13 is branched off and compressed by means of a compressor 14 with the highest possible suction pressure.
• unused reducing gas downstream of the wet scrubber 11 can be diverted via a further line 15 before admixture with the export gas and recycled.
• the recirculated top gas can according to a first variant after intercooling to 30-50 0 C in the cooler 16 and reduction of the CO 2 content to 2-3% by volume in the system 17 for CO 2 Entfemung introduced via lances 18 in the oxygen nozzles are injected into the melter gasifier 3, wherein the return line for the top gas to the mouth of the oxygen supply is parallel to this. Part of this gas treated in this way can be branched off and admixed for transporting the particles returned from the hot gas cyclone 7.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacture Of Iron (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• Hydrogen, Water And Hydrids (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38912104

Family Applications (1)

Country Status (16)

Families Citing this family (4)

Citations (5)

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• 2006
  • 2006-10-13 DE DE102006048601A patent/DE102006048601A1/de not_active Withdrawn
• 2007
  • 2007-10-01 CN CNA2007800376484A patent/CN101528948A/zh active Pending
  • 2007-10-01 WO PCT/EP2007/008514 patent/WO2008046503A1/de active Application Filing
  • 2007-10-01 EP EP07818594A patent/EP2082066A1/de not_active Withdrawn
  • 2007-10-01 KR KR1020097008757A patent/KR20090068351A/ko not_active Application Discontinuation
  • 2007-10-01 AU AU2007312665A patent/AU2007312665A1/en not_active Abandoned
  • 2007-10-01 MX MX2009003725A patent/MX2009003725A/es unknown
  • 2007-10-01 RU RU2009117865/02A patent/RU2009117865A/ru unknown
  • 2007-10-01 BR BRPI0719172-3A2A patent/BRPI0719172A2/pt not_active IP Right Cessation
  • 2007-10-01 ZA ZA200902093A patent/ZA200902093B/xx unknown
  • 2007-10-01 US US12/445,349 patent/US20100024599A1/en not_active Abandoned
  • 2007-10-01 JP JP2009531734A patent/JP2010506046A/ja active Pending
  • 2007-10-01 CA CA002665763A patent/CA2665763A1/en not_active Abandoned
  • 2007-10-03 TW TW096136997A patent/TW200827452A/zh unknown
  • 2007-10-12 CL CL200702941A patent/CL2007002941A1/es unknown
  • 2007-10-12 AR ARP070104522A patent/AR063265A1/es unknown

Patent Citations (5)

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