EP0807187A1 - Procede et dispositif pour refroidir du fer spongieux chaud briquete - Google Patents

Procede et dispositif pour refroidir du fer spongieux chaud briquete

Info

Publication number
EP0807187A1
EP0807187A1 EP96900197A EP96900197A EP0807187A1 EP 0807187 A1 EP0807187 A1 EP 0807187A1 EP 96900197 A EP96900197 A EP 96900197A EP 96900197 A EP96900197 A EP 96900197A EP 0807187 A1 EP0807187 A1 EP 0807187A1
Authority
EP
European Patent Office
Prior art keywords
sponge iron
cooling
cooling medium
iron
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.)
Granted
Application number
EP96900197A
Other languages
German (de)
English (en)
Other versions
EP0807187B1 (fr
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/fr
Application granted granted Critical
Publication of EP0807187B1 publication Critical patent/EP0807187B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 must be subjected to a cooling which follows the production of the sponge iron as soon as possible so that it can be transported and stored safely and economically.
  • DE-C - 29 35 707 From DE-C - 29 35 707 it is known to cool hot briquetted sponge iron by placing it in a quenching tank in which it is cooled to the desired final temperature. In DE-C - 29 35 707 it is also mentioned that air cooling can also be provided instead of the quenching tank.
  • a disadvantage of these known submersible 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 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 to avoid these disadvantages and difficulties and has as its object to provide a method of the type described above and an apparatus for carrying out the method, which enable a trouble-free cooling process with optimal use of the capacity of the cooling device.
  • the briquetted sponge iron should have a high product quality, while the formation of fine particles during cooling is avoided as far as possible.
  • the device for carrying out the method should be subject to low stress and thus have a long service life.
  • the hot briquetted sponge iron is flowed through exclusively by a gaseous cooling medium, preferably cooling air, and is gently cooled in the meantime,
  • a gaseous cooling medium is preferably additionally flowed through the briquetted sponge iron during the second cooling step, as a result of which a particularly intensive contact of the sponge iron with the cooling medium is achieved.
  • the hot briquetted iron sponge is expediently cooled to a temperature at least in the region of half the temperature of the hot iron sponge, preferably to a temperature below this temperature, during the first cooling step, as a result of which the use of the liquid cooling medium becomes particularly efficient, especially since the intensity , with which the Leidenfrost phenomenon occurs, and its insulating effect is much lower at lower temperatures 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.
  • the gaseous cooling medium is applied by pressing or by suction, the sponge iron being applied in the form of a bed on a gas-permeable pad.
  • a preferred way of applying liquid cooling medium to the briquetted sponge iron is by injecting the liquid cooling medium into an air stream. This also makes it possible to largely avoid an insulating effect due to water vapor forming on the surface of the sponge iron.
  • dust extraction is advantageously carried out before the first cooling step.
  • a gas guide device at least partially surrounding the support for supplying a gaseous cooling medium to the briquetted sponge iron
  • the spray nozzles are arranged in the device only in the second half, as seen in the direction of movement of the support that carries the sponge iron.
  • a preferred embodiment of the device is characterized in that the support is formed by an endless conveyor belt, such as a plate belt, the upper belt strand of which is used to hold the hot briquetted iron sponge.
  • Another preferred embodiment has a grating designed as a round cooler as a support for the sponge iron.
  • the gas guide device preferably also extends over the area of the spray nozzles.
  • the pad that holds the sponge iron expediently passes through a dust extraction device.
  • Either single-substance nozzles or two-substance nozzles are provided for applying the liquid cooling medium, liquid cooling medium and gaseous cooling medium being able to be supplied to the briquetted sponge iron via the latter.
  • FIG. 1 shows a cooling device according to the invention in a schematic illustration in a side view
  • FIG. 2 illustrates the basic temperature curve that occurs here over the length of the cooling section
  • Fig. 3 shows the design of a cooling device according to the invention, also in side view.
  • the cooling device is equipped with a continuously and uniformly driven endless conveyor belt 1, such as a plate belt, the upper belt strand 2 of which serves as a support for hot sponge iron briquettes 3.
  • This sponge iron 3 is expediently applied to the gas-permeable endless conveyor belt 1 in the form of a belt, 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 applied in multiple layers to form an iron sponge belt 9 that is as uniform as possible, via the feed chutes 5.
  • the sponge iron 3 When the sponge iron 3 is moved in the direction of arrow 6 by being carried along with the endless conveyor belt 1, it is first passed through a dedusting zone 7 which has a hood 10 which is connected to a dust extractor 8 and covers the iron sponge belt 9. In the dedusting zone, the fine material adhering to the surfaces of the sponge iron particles, such as the briquette surfaces, is suctioned off.
  • the sponge iron belt 9 is then moved through an air cooling zone 11, in which the hot sponge iron 3 - it has a temperature T A in the range between 580 and 720 ° C. when applied to the endless conveyor belt 1 - exclusively with the aid of cooling air, in accordance with Fig. 1 is cooled to about 350 ° C by means of cooling air pressed through the iron sponge belt 9 from below.
  • the cooling air is compressed by means of a compressor 12 and fed to the upper belt run 2 via an air guiding device 13 such that the air is forced to flow through the sponge belt 9.
  • the cooling air system has a silencer, a volume flow control and collection and distribution channels, not shown, including the necessary shut-off devices and control devices.
  • a water cooling zone 14 is provided in the approximately third third of the upper belt run 2, in which the sponge iron 3 is intensively cooled to a surface temperature of approximately 85 ° C. by means of sprayed water.
  • the water is sprayed on via a distribution system 15 via a plurality of spray nozzles 16, which are designed either as single-substance nozzles or as two-substance nozzles. If two-substance nozzles are used, they are fed with treated water and compressed air.
  • the. Air supply also via the water cooling zone 14, so that an additional cooling effect by cooling air occurs in the water cooling zone 14.
  • the air pressed through the hot sponge iron 3 and the resulting steam are collected in a discharge hood 17 and discharged via a suction device (not shown) with a cleaning device.
  • the sponge iron 3 After the sponge iron 3 has left the endless conveyor belt 1 and is further conveyed via a discharge chute 18, the sponge iron 3 dries off due to the residual heat still remaining in it.
  • 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 reaches a temperature approximately in the region of half the starting temperature T A or below has reached the exclusive air cooling, according to the invention the water cooling is used, which causes a relatively abrupt and intensive cooling of the sponge iron 3 in comparison to the air cooling. The final temperature of the sponge iron 3 thus achieved after a relatively short cooling time is designated T E.
  • 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 ⁇ of the iron sponge achieved here is significantly higher than the final temperature Tg 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 increased or increased in quantity the layer height 4 of the sponge iron strip 9 and thus the specific throughput are reduced.
  • a dashed line III in FIG. 2 illustrates a cooling curve that would result from cooling the sponge iron 3 if this sponge iron 3 was 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 Leidenfrosf phenomenon, the effectiveness of the cooling does not reach that of the cooling effect according to the invention to an increased extent, ie the final temperature T_ which can only be achieved with liquid cooling medium also lies 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 to provide a circular cooler which is formed by a gas-permeable grate and which rotates slowly, the sponge iron applied to the grate during a rotation of the grate, for example by 260 °, by means of cooling air and then is cooled by cooling water.
  • the cooling air can be passed through the iron sponge belt 9 by suction or pressing from below or from above.

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)

Abstract

L'invention concerne un procédé de refroidissement de fer spongieux (3) chaud briqueté, selon lequel on parvient à une température finale aussi basse que possible au bout d'une période aussi courte que possible, en utilisant optimalement le réfrigérant. A cet effet, dans une première étape de refroidissement (11), le fer spongieux (3) chaud briqueté est uniquement traversé par un milieu de refroidissement gazeux et est simultanément refroidi modérément. Dans une seconde étape de refroidissement (14), un milieu de refroidissement liquide est pulvérisé sur le fer spongieux (3) chaud briqueté qui est refroidi de manière intensive jusqu'à obtention de la température finale.
EP96900197A 1995-01-23 1996-01-22 Procede et dispositif pour refroidir du fer spongieux chaud briquete Expired - Lifetime EP0807187B1 (fr)

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 1995-01-23
PCT/AT1996/000008 WO1996023081A1 (fr) 1995-01-23 1996-01-22 Procede et dispositif pour refroidir du fer spongieux chaud briquete

Publications (2)

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

Family

ID=3481680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900197A Expired - Lifetime EP0807187B1 (fr) 1995-01-23 1996-01-22 Procede et dispositif pour refroidir du fer spongieux chaud briquete

Country Status (16)

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

Families Citing this family (11)

* 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 (fr) * 2001-09-19 2008-06-18 Nippon Steel Corp Dispositif de refroidissement et procede de refroidissement de masses de fer reduites
DE20302678U1 (de) * 2003-02-19 2003-05-22 AUMUND-Fördererbau GmbH & Co. KG, 47495 Rheinberg Heißgutförderer
US7968044B2 (en) * 2007-04-30 2011-06-28 Spraying Systems Co. Sinter processing system
US8518146B2 (en) 2009-06-29 2013-08-27 Gb Group Holdings Limited Metal reduction processes, metallurgical processes and products and apparatus
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

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE25668C (de) * A. LINDENBERG in Berlin C, Neue Grünstr. 25 Werkzeug zum Ausschneiden kreisförmiger oder gerader Reifen aus Fourniren
DD25668A (fr) *
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 (fr) * 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9623081A1 *

Also Published As

Publication number Publication date
KR19980701673A (ko) 1998-06-25
CA2211021C (fr) 2002-01-01
JPH11500782A (ja) 1999-01-19
MX9705465A (es) 1998-07-31
PE38296A1 (es) 1996-09-25
CO4560387A1 (es) 1998-02-10
DE59600430D1 (de) 1998-09-17
AT404361B (de) 1998-11-25
US6048381A (en) 2000-04-11
ATA10695A (de) 1998-03-15
AU703991B2 (en) 1999-04-01
AU4379596A (en) 1996-08-14
ZA96468B (en) 1996-08-28
RU2142517C1 (ru) 1999-12-10
EG21043A (en) 2000-09-30
EP0807187B1 (fr) 1998-08-12
AR000749A1 (es) 1997-08-06
WO1996023081A1 (fr) 1996-08-01
KR100383351B1 (ko) 2003-07-18
JP4006022B2 (ja) 2007-11-14
CA2211021A1 (fr) 1996-08-01
BR9606929A (pt) 1997-11-11

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