Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B3/00—General features in the manufacture of pig-iron
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B13/00—Making spongy iron or liquid steel, by direct processes
  • C21B13/0086—Conditioning, transformation of reduced iron ores
  • C21B13/0093—Protecting against oxidation
• • 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
• • 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
  • F27D3/00—Charging; Discharging; Manipulation of charge
  • F27D3/0025—Charging or loading melting furnaces with material in the solid state
• • 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
• • 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
• • 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 a device for charging a precursor for pig iron into a smelting unit.
• compacted iron (HCl) is obtained, a storage device or charging device, which is optionally traversed by a reducing gas, and from there to a smelting unit such as a melter gasifier.
• a storage device, also called HCI bin, or charging device performs a buffering function to ensure continuous charging of hot compacted iron into the system
• Pre-heat materials such as pellets or lump or coke through the reducing gas.
• Storage device is arranged above the smelting unit in order to allow a charging from the storage device in the smelting unit in the direction of gravity.
• the majority of the hot compacted iron obtained in the compacting step becomes one during normal operation
• FINEX ® system fed after compacting directly in the hot state of the storage device or charging device. Another portion of the recovered hot compacted in the compacting iron is used in the normal operation of a FINEX ® plant after compaction to create a stored outside of the memory device or charging device stock compacted irons. This supply of compacted irons is required, for example, during startup or low driving a FINEX ® plant.
• the hot compacted iron not directly transferred to the storage device is typically quenched with water in a quench tank and connected outdoors under atmospheric conditions
• Charging device supplied In this it is preheated before being charged into the smelting unit.
• Iron briquetted iron (hot briquetted iron, HBI) as - briquetted, that is, thus compacted - precursor is produced.
• Melting unit directly connected storage device or charging device, from which an addition takes place in the melter, is supplied, characterized in that a portion of the precursor is stored in a hot state in a storage container before it is fed into the storage device or charging device directly connected to the melter ,
• the oxidic iron carriers are converted into a precursor by reduction by means of a first reducing gas
• pig iron for example direct reduced iron DRI, implemented. If the product of the reduction is not lumpy, but is finely particulate, it may
• Storage device or charging device takes place.
• the precursor iron is not cooled by quenching, but stored in a hot condition in the reservoir. If compaction takes place, the precursor is stored in the reservoir after compaction. In this way, in the case of charging in the
• the addition of the stored in the reservoir precursor into the storage device or charging device can be done during a startup. It can also be done during normal operation, by addition of
• Storage device and charging device are as
• Smelting unit are suitable, respectively.
• Charging device requires some time. During this time, the material is therefore in the charging device and is thus stored in it.
• the oxidic iron carriers are finely particulate iron ore, or they are lump or pellets.
• the precursor is hot compacted iron.
• HCl compacted iron HCl, if the density of the precursor is less than or equal to 4.5 kg / dm 3 , and the metallization ⁇ 88%.
• HCl may contain additives.
• the precursor is hot briquetted iron HBI.
• HBI hot briquetted iron
• the density of the precursor greater than or equal to 5 kg / dm 3 and its metallization is greater than or equal to 88%.
• HBI typically contains no aggregates.
• the precursor is hot low-reduction iron.
• Storage container stored precursor with a
• Reverse oxidation protection gas which is a reoxidation of the
• Pre-product inhibits, lapped. This way a can
• an inert gas such as nitrogen in question or a reducing gas - in this reducing gas may be, for example, the first
• Reduction gas act or to the following
• Memory device or charging device flows through a second reducing gas.
• the first reducing gas and the second reducing gas are from the same
• the smelting unit such as a melter gasifier.
• the number of for the Provision of reducing gases necessary facilities reduced.
• the addition from the storage device or charging device takes place in the smelting unit in
• Gravity take place, that is, for example, such that the storage device or charging device is located below a feed opening for precursor in the melter and from there upwards, ie opposite to the
• the feed opening and the storage device or charging device may be laterally spaced apart from one another, wherein the precursor must be conveyed from the storage device or charging device sideways to the feed opening, not in the direction of
• Material can be done, for example, if the opening from which the precursor the storage device or
• Another object of the present invention is an apparatus for performing a method according to any one of claims 1 to 10, comprising at least one reduction unit for the reduction of oxidic iron carriers by means of a first reducing gas, a first reducing gas line opening into the reduction unit, a Melting unit for the production of pig iron from the obtained in the reduction of oxidic iron carriers by means of the first reducing gas precursor, and a
• Storage device or charging device connected to the smelting unit via at least one metering line
• Feed opening in the meltdown unit opens, and wherein a feed device for the task of pre-product is present on the supply device, characterized in that a reservoir for storage of precursor in the hot state is present, and an input device for input of intermediate product in the reservoir, wherein the reservoir also connected to the supply device.
• the oxidic iron carriers are in at least one
• Fluidized bed reactor or can be designed as a fixed bed reduction shaft, reduced by means of a first reducing gas.
• the first reducing gas used for the reduction is supplied by means of a first reducing gas line opening into the reduction unit.
• the addition line with an addition opening in the
• Melting unit opens can also be part of the
• the reduction unit may be, for example, a fixed bed reactor or a fluidized bed reactor.
• the optionally compacted or briquetted intermediate product obtained in the reduction of oxidic iron carriers is applied by means of a feed device to a feed device for the supply of precursor.
• the feeder can, for example, a chute,
• Feed device for supplying precursor for example a hot conveyor, the precursor is in one
• the storage device or charging device is connected to the smelting unit via a metering line, through which an addition of precursor from the storage device or charging device takes place directly into the smelting unit.
• additional devices may be present, such as valves or lock devices.
• the metering line opens with an addition opening in the smelting unit, through which originating from the storage device material in the
• the device according to the invention has a
• Reservoir for storing precursor in a hot state. This is connected both to an input device for input of precursor into the reservoir, as well as to the supply device.
• Input device is for example a downpipe, a
• Vor. can therefore be entered into the reservoir Vierden, and from the reservoir - for example via screw conveyor, rotary valve, intermediate hot conveyor, valve, pipe, chute - on the
• the storage container is lined with refractory material. Its storage capacity should advantageously meet the demand for precursor, for example hot compacted iron HCl, for about 12-24 hours to about two days operation of the apparatus for carrying out the invention
• a demand of 4600t HCl would correspond to a reservoir volume of about 2 x 900m 3 .
• a compaction device for compaction and / or briquetting is present, wherein the compacting device between the
• the compacting device is in each case connected to the two device parts between which it is located, "between" is in terms of
• Compacting device comprising compacting and crusher systems, compacted.
• hot compacted iron HCl or hot briquetted iron HBI is produced as precursor.
• a feeding device for the task of compacted and / or briquetted
• Input device for input of compacted and / or briquetted precursor from the compacting device is connected to the reservoir.
• a second opens
• Charging device Due to the contact with the second reducing gas introduced through the latter, material which is located in the storage device or charging device may optionally be partially reduced or
• the first reducing gas line and the second reducing gas line with an aggregate for
• An aggregate for reducing gas production is to be regarded as a source of reducing gas.
• a greedoxidationsschutzgas Arthur opens for supplying greedoxidationsschutzgas in the reservoir.
• the hot precursor present in the reservoir for example hot compacted iron HCl, can be protected from reoxidation.
• the reservoir is arranged at a lower level, for example at the level of the ground, than the feed opening into the smelting unit. This results in manufacturing material and
• the melter is a melter gasifier. It can also be a blast furnace.
• Quenching of precursor, such as HCl, before storage results according to the invention the advantage that no wet quenched precursor, such as HCl, with hot precursor, such as HCl, is mixed, creating explosion hazard by hydrogen generation
• a storage device or charging device such as an HCI bin
• a storage device or charging device can be made smaller, because material for buffering production variations of precursor need not be present in the HCI bin but can be withdrawn from the reservoir , This reduces material and labor costs for the construction of the HCI-Bin as well as its height.
• at least two storage containers are provided in order to use a redundancy container during maintenance work.
• Pre-product from the reservoir can also be supplied to several different meltdown units,
• melter gasifier for example, a melter gasifier and a blast furnace.
• FIG. 1 shows a schematic structure of a
• FIG. 2 shows a schematic structure of a
• Fine particle iron ore 1 is introduced into a cascade of fluidized bed reactors 2a, 2b, 2c.
• Reduction gas is introduced via the first reducing gas line 3 into the fluidized-bed reactor 2c, after leaving it via a connecting line 4 into the fluidized bed reactor 2b, passed after leaving via a connecting line 5 in the fluidized bed reactor 2a and withdrawn from this via a top gas line 6.
• Reduction gas line 3 rises at the melter gasifier 7, in which pig iron is produced from hot compacted iron. From the fluidized bed reactor 2c removed product is by means of a compacting device, the
• Crushing system 9b comprises, compacted to hot compacted iron.
• the hot compacted iron is fed via a supply device 10 to a storage device 11, the HCI bin.
• the HCI bin is above the
• Melter gasifier 7 arranged.
• the storage device 11 is connected to the melter gasifier 7 via a metering line 12, via which hot compacted iron HCl is added by gravity from the storage device 11 into the melter gasifier 7.
• the metering line 12 opens with a feed opening 13 in the melter gasifier 7.
• a second reducing gas line 14 opens into the
• Hot compacted iron produced in the compacting apparatus can be directly inputted to the storage tank 19 with appropriate adjustment of the chute 15 via an input device represented by line 17 and hot conveyor 18.
• an input device represented by line 17 and hot conveyor 18 About a opening into the reservoir 19
• the inert gas nitrogen is fed into the reservoir 19.
• the storage container 19 is connected to the supply device 10 via the supply outlet line 21 and the hot conveyor 22.
• hot compacted iron can be taken out of the reservoir 19 and supplied to the storage device 11.
• FIG. 2 device parts corresponding to FIG. 1 are provided with the same reference numerals as in FIG. FIG. 2 differs from FIG. 1 in that instead of
• Fluidized bed reactors a fixed bed reactor 24 as
• Reduction unit is used. In these, 23 lumps and pellets are entered as oxidic iron carriers.
• the fixed bed reactor is connected to the first reducing gas line 3, through which first reducing gas flows.
• Used reducing gas is withdrawn via the top gas line 6.
• Precursor is fed from the fixed bed reactor 24 either via line 16 of the feed device 10, or fed via line 17 to the hot conveyor 18, via which the hot precursor is conveyed into the reservoir 19.
• Preproduct can be supplied from the reservoir 19 via the execution line 25 a blast furnace 26.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Organic Chemistry (AREA)
• Metallurgy (AREA)
• Materials Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Geochemistry & Mineralogy (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacture Of Iron (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Furnace Details (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Crucibles And Fluidized-Bed Furnaces (AREA)
• Furnace Charging Or Discharging (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2009
  • 2009-10-16 AT AT0163609A patent/AT508953B1/de active
• 2010
  • 2010-10-06 JP JP2012533571A patent/JP2013507527A/ja active Pending
  • 2010-10-06 KR KR1020127012560A patent/KR101724268B1/ko active Active
  • 2010-10-06 EP EP10765415A patent/EP2488810A1/de not_active Withdrawn
  • 2010-10-06 US US13/502,282 patent/US8728384B2/en active Active
  • 2010-10-06 CN CN201080046646.3A patent/CN102612632B/zh active Active
  • 2010-10-06 CA CA2777654A patent/CA2777654C/en active Active
  • 2010-10-06 BR BR112012008905A patent/BR112012008905B1/pt active IP Right Grant
  • 2010-10-06 AU AU2010305955A patent/AU2010305955B2/en active Active
  • 2010-10-06 IN IN2795DEN2012 patent/IN2012DN02795A/en unknown
  • 2010-10-06 WO PCT/EP2010/064867 patent/WO2011045212A1/de active Application Filing
  • 2010-10-06 RU RU2012120086/02A patent/RU2533990C2/ru active
  • 2010-10-06 UA UAA201204641A patent/UA106508C2/uk unknown
• 2014
  • 2014-03-06 US US14/198,697 patent/US9365906B2/en active Active

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