EP0807187B1 - Verfahren und vorrichtung zum abkühlen von heissem brikettiertem eisenschwamm - Google Patents

Verfahren und vorrichtung zum abkühlen von heissem brikettiertem eisenschwamm Download PDF

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Publication number
EP0807187B1
EP0807187B1 EP96900197A EP96900197A EP0807187B1 EP 0807187 B1 EP0807187 B1 EP 0807187B1 EP 96900197 A EP96900197 A EP 96900197A EP 96900197 A EP96900197 A EP 96900197A EP 0807187 B1 EP0807187 B1 EP 0807187B1
Authority
EP
European Patent Office
Prior art keywords
sponge iron
cooling
cooling medium
several
briquetted
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.)
Expired - Lifetime
Application number
EP96900197A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0807187A1 (de
Inventor
Leopold Werner Kepplinger
Gerhard Cip
Anton Himmel
Karl-Heinz Zimmerbauer
Roland Sachsenhofer
Roy Hubert Whipp, Jr.
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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 Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP0807187A1 publication Critical patent/EP0807187A1/de
Application granted granted Critical
Publication of EP0807187B1 publication Critical patent/EP0807187B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

Definitions

  • the invention relates to a method for cooling hot briquetted sponge iron, and an apparatus for performing the method.
  • Hot briquetted sponge iron has to be safe with economically justifiable Effort to be transported and stored, one of the production of the Sponge iron are subjected to the following cooling as soon as possible.
  • DE-C - 29 35 707 From DE-C - 29 35 707 it is known to be called briquetted sponge iron cool that it is placed in a quenching tank in which it is brought to the desired Final temperature is cooled. In DE-C - 29 35 707 it is also mentioned that instead of Quenching tanks can also be provided with air cooling.
  • a disadvantage of these known submerged water cooling systems is that the mechanical parts used to transport the hot iron sponge briquettes alternately come into contact with hot water with a high solids, CO 2 and suspended matter content and ambient air, so that these parts are subject to very high wear.
  • the contact of the very hot sponge iron briquettes with cooling water creates the risk of water gas reactions. Due to the Leidenfrost phenomenon, which occurs very intensely in this high temperature range, water cooling is also not very efficient.
  • the insulating layer formed here from water vapor on the surface of the sponge iron briquettes has a severe deteriorating effect on the heat transfer in the high temperature range. Furthermore, the contact of the still hot iron sponge briquettes with the cooling water leads to a reduction in the product quality, etc.
  • the invention aims at avoiding these disadvantages and difficulties and presents itself the task, a method of the type described above and a device for Implementation of the process to create a trouble-free cooling process allow for optimal utilization of the capacity of the cooling device.
  • JP-A-06-316718 discloses iron briquettes in a first cooling stage Spray with cooling water and in a second stage with an even faster cooling To cool water. It is also known, first with a gas instead of water spray to cool, with this gas cooling the same high cooling speed as with Spray cooling is provided. The second cooling level is even faster cooling Water provided. From a further embodiment variant of JP-A-06-316718 known, first with inert gas, then with water spray and finally even faster to cool with water.
  • briquetted sponge iron should have a high product quality, one Formation of fine particles is avoided as possible during cooling.
  • the device for Implementation of the method should be subject to a low level of stress, and thus a have a long service life.
  • the briquetted sponge iron is preferably used during the second cooling step additionally flows through a gaseous cooling medium, which makes a special intensive contact of the sponge iron with the cooling medium succeeds.
  • the hot briquetted iron sponge is expediently opened during the first cooling step a temperature at least in the region of half the temperature of the hot Sponge iron, preferably cooled to a temperature below this temperature, which makes the use of the liquid cooling medium particularly efficient, especially since the Intensity with which the Leidenfrost phenomenon occurs and its isolation effect lower temperatures is much lower than at high temperatures.
  • the first cooling step is preferably carried out over a longer period of time than the second Cooling step, preferably over a period of more than 60% of the total cooling time, carried out.
  • the application is carried out according to a preferred embodiment gaseous cooling medium by pressing or by suction.
  • a preferred way of applying liquid to the bound iron sponge Cooling medium takes place by injecting the liquid cooling medium into an air stream. Also this enables an insulating effect due to itself on the surface of the Avoid spongy water vapor.
  • a preferred embodiment of the device is characterized in that the Edition of an endless conveyor belt, such as a plate belt, is formed, the upper Band strand is used to hold the hot briquetted sponge iron.
  • Another preferred embodiment has a support for the sponge iron as Circular cooler trained grid.
  • the gas guide device preferably also extends over the area of the spray nozzles.
  • Either single-substance nozzles or two-substance nozzles are used to apply the liquid cooling medium provided, the liquid cooling medium as well as gaseous cooling medium via the latter briquetted sponge iron can be fed.
  • Fig. 1 is a Cooling device according to the invention in a schematic representation in side view and Fig. 2nd the resulting basic temperature profile over the length of the cooling section illustrate.
  • Fig. 3 shows the structural design of an inventive Cooling device, also in side view.
  • the cooling device with a continuously and uniformly driven endless conveyor belt 1, such as one Plattenband, equipped, the upper band strand 2 as a support for hot Sponge iron briquettes 3 is used.
  • This sponge iron 3 is on the gas-permeable endless conveyor belt 1 appropriately applied in tape form, e.g. in a layer height 4 of about 200 mm and in a width corresponding to the bandwidth, e.g. about 1000 mm.
  • the iron sponge 3 is used to form the most uniform possible Sponge iron belt 9 in layers over the feed chutes 5.
  • the sponge iron belt 9 is then moved through an air cooling zone 11, in which the hot one Iron sponge 3 - it has a temperature TA in the range between 580 and 720 ° C
  • the cooling air is compressed by a compressor 12 and over an air guiding device 13 is fed to the upper belt run 2 in such a way that the air is forced is to flow through the sponge iron strip 9.
  • the cooling air system has a silencer, a volume flow control and not closer shown collection and distribution channels including the necessary shut-off devices and Controls on.
  • a water cooling zone 14 is provided in the approximately third third of the upper belt run 2, in which the sponge iron 3 by means of sprayed water to a surface temperature of about 85 ° C is intensively cooled.
  • the water is sprayed on via a distribution system 15 several spray nozzles 16, which are designed either as single-substance nozzles or as two-substance nozzles are. If two-substance nozzles are used, these are treated with treated water and compressed air.
  • the air supply also extends over the water cooling zone 14, so that in the water cooling zone 14 by an additional cooling effect Cooling air occurs.
  • the air pressed by the hot sponge iron 3 and the resulting steam are in a discharge hood 17 collected and with a suction, not shown Cleaning device derived.
  • FIG. 2 The particularly high efficiency of the cooling method according to the invention can be clearly seen from FIG. 2.
  • the full course of the line I shows the temperature profile on the surface of the sponge iron 3 over the length of the cooling device. It can be seen that the sponge iron 3 is gently and gently cooled in the air cooling zone 11, in which only air is used for cooling. Only when the sponge iron 3 has reached a temperature approximately in the region of half the initial temperature T A or below through the exclusive air cooling does the water cooling according to the invention begin, which causes a relatively abrupt and intensive cooling of the sponge iron 3 in comparison to the air cooling.
  • T E The final temperature of the sponge iron 3 reached after a relatively short cooling time
  • the dashed line II in FIG. 2 illustrates the temperature profile of the sponge iron 3, which would occur over the entire length of the upper belt run 2 if only air cooling was used.
  • the final temperature T " E of the sponge iron which is achieved in this case is clearly above the final temperature T E achieved according to the invention.
  • the device In order to be able to reach the final temperature T E according to the invention exclusively with air cooling, the device would have to extend over a substantially greater length and / or the air throughput would have to be quantitative significantly increased or the layer height 4 of the sponge iron strip 9 and thus the specific throughput can be reduced.
  • a dashed line III in FIG. 2 illustrates a cooling curve that would result from a cooling of the sponge iron 3 if this sponge iron 3 is sprayed in an initial area exclusively with liquid cooling medium, ie cooling water. It can be seen that initially a more abrupt cooling takes place than with air, but that due to the occurrence of the Leidenfrost phenomenon, the effectiveness of the cooling does not reach that of the cooling effect according to the invention, ie the final temperature T " E which can only be achieved with liquid cooling medium is also above the final temperature T E achieved according to the invention, so here too the cooling device would have to be designed longer or the sponge iron would be exposed to cooling medium for a longer time.
  • the invention is not limited to the embodiment shown in the drawing, but can be modified in various ways.
  • the endless conveyor belt 1 it is possible instead of the endless conveyor belt 1 to provide a round cooler by one gas permeable grate is formed and which rotates slowly, the one on the grate sponge iron applied during a rotation of the grate, for example by 260 °, is cooled by means of cooling air and then by means of cooling water.
  • the air supply alone in the air cooling zone 11 and in the Subsequent water cooling zone 14 to work exclusively with one or two-substance nozzles.
  • the cooling air can be sucked or pressed from below or from above through the Sponge iron belt 9 are passed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP96900197A 1995-01-23 1996-01-22 Verfahren und vorrichtung zum abkühlen von heissem brikettiertem eisenschwamm Expired - Lifetime EP0807187B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0010695A AT404361B (de) 1995-01-23 1995-01-23 Verfahren und vorrichtung zum abkühlen von heissem eisenschwamm
AT106/95 1995-02-28
PCT/AT1996/000008 WO1996023081A1 (de) 1995-01-23 1996-01-22 Verfahren und vorrichtung zum abkühlen von heissem brikettiertem eisenschwamm

Publications (2)

Publication Number Publication Date
EP0807187A1 EP0807187A1 (de) 1997-11-19
EP0807187B1 true EP0807187B1 (de) 1998-08-12

Family

ID=3481680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900197A Expired - Lifetime EP0807187B1 (de) 1995-01-23 1996-01-22 Verfahren und vorrichtung zum abkühlen von heissem brikettiertem eisenschwamm

Country Status (16)

Country Link
US (1) US6048381A (ja)
EP (1) EP0807187B1 (ja)
JP (1) JP4006022B2 (ja)
KR (1) KR100383351B1 (ja)
AR (1) AR000749A1 (ja)
AT (1) AT404361B (ja)
AU (1) AU703991B2 (ja)
BR (1) BR9606929A (ja)
CA (1) CA2211021C (ja)
CO (1) CO4560387A1 (ja)
DE (1) DE59600430D1 (ja)
EG (1) EG21043A (ja)
PE (1) PE38296A1 (ja)
RU (1) RU2142517C1 (ja)
WO (1) WO1996023081A1 (ja)
ZA (1) ZA96468B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8518146B2 (en) 2009-06-29 2013-08-27 Gb Group Holdings Limited Metal reduction processes, metallurgical processes and products and apparatus

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406963B (de) 1998-08-12 2000-11-27 Voest Alpine Ind Anlagen Verfahren zur herstellung von eisenbriketts und/oder kaltem eisenschwamm
JP3009661B1 (ja) * 1999-01-20 2000-02-14 株式会社神戸製鋼所 還元鉄ペレットの製造方法
JP2003027149A (ja) * 2001-07-10 2003-01-29 Kobe Steel Ltd 還元鉄ブリケットの製造方法
JP2003034813A (ja) * 2001-07-24 2003-02-07 Kobe Steel Ltd 粒状金属鉄とスラグの分離促進方法
JP4766806B2 (ja) * 2001-09-27 2011-09-07 新日鉄エンジニアリング株式会社 還元鉄塊成化物の冷却方法
EP1445335A4 (en) * 2001-09-19 2008-06-18 Nippon Steel Corp COOLING DEVICE AND METHOD FOR COOLING REDUCED IRON MASSES
DE20302678U1 (de) * 2003-02-19 2003-05-22 Aumund Foerdererbau Gmbh & Co Heißgutförderer
US7968044B2 (en) * 2007-04-30 2011-06-28 Spraying Systems Co. Sinter processing system
CN104249932B (zh) * 2013-06-28 2016-04-27 宝山钢铁股份有限公司 防止高温落料烫伤运输胶带的方法
CN113913579B (zh) * 2021-10-12 2023-01-24 中冶赛迪工程技术股份有限公司 用于冷却热态海绵铁的循环方法

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FR1215666A (fr) * 1958-02-19 1960-04-20 R N Corp Procédé de production de fer, appareil pour sa réalisation et produit obtenu
FR1315257A (fr) * 1961-12-22 1963-01-18 R N Corp Procédé perfectionné pour la fabrication de briquettes de fer
FR2193881B1 (ja) * 1972-07-26 1974-10-25 Delattre Levivier
ZA762594B (en) * 1975-06-05 1977-04-27 Midrex Corp Method and apparatus for continuous passivation of sponge iron material
DE2809172A1 (de) * 1978-03-03 1979-09-06 Kloeckner Humboldt Deutz Ag Verfahren und anlage zur kuehlung von reduziertem gut wie feinkoerniges erz
SU755844A1 (ru) * 1978-05-10 1980-08-15 Vnii Metall Teplotekhniki Двухстадийный способ охлаждения окатышей 1
US4165978A (en) * 1978-07-14 1979-08-28 Midrex Corporation Briquet sheet breaking by cooling and bending
US4188022A (en) * 1978-09-08 1980-02-12 Midrex Corporation Hot discharge direct reduction furnace
DD146847A1 (de) * 1979-12-29 1981-03-04 Rainer Ruehl Kuehltunnel fuer die gesteuerte zwangskuehlung von erhitztem gut,insbesondere von gussstuecken
JPS56163209A (en) * 1980-05-20 1981-12-15 Mitsubishi Heavy Ind Ltd Method for recovering waste heat of hot briquette
JPS59170213A (ja) * 1983-03-16 1984-09-26 Nippon Steel Corp 還元鉄ブリケツトの製造方法
JPS637341A (ja) * 1986-06-27 1988-01-13 Nippon Kokan Kk <Nkk> 焼結鉱の冷却方法
JP3145834B2 (ja) * 1993-03-08 2001-03-12 株式会社神戸製鋼所 還元鉄ブリケットの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8518146B2 (en) 2009-06-29 2013-08-27 Gb Group Holdings Limited Metal reduction processes, metallurgical processes and products and apparatus

Also Published As

Publication number Publication date
KR19980701673A (ko) 1998-06-25
ATA10695A (de) 1998-03-15
ZA96468B (en) 1996-08-28
EG21043A (en) 2000-09-30
PE38296A1 (es) 1996-09-25
JP4006022B2 (ja) 2007-11-14
BR9606929A (pt) 1997-11-11
CO4560387A1 (es) 1998-02-10
JPH11500782A (ja) 1999-01-19
AT404361B (de) 1998-11-25
AR000749A1 (es) 1997-08-06
EP0807187A1 (de) 1997-11-19
AU703991B2 (en) 1999-04-01
WO1996023081A1 (de) 1996-08-01
MX9705465A (es) 1998-07-31
US6048381A (en) 2000-04-11
CA2211021C (en) 2002-01-01
CA2211021A1 (en) 1996-08-01
DE59600430D1 (de) 1998-09-17
AU4379596A (en) 1996-08-14
KR100383351B1 (ko) 2003-07-18
RU2142517C1 (ru) 1999-12-10

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