EP0094928B1 - Dispositif de déchargement pour un four à cuve - Google Patents

Dispositif de déchargement pour un four à cuve Download PDF

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Publication number
EP0094928B1
EP0094928B1 EP83890059A EP83890059A EP0094928B1 EP 0094928 B1 EP0094928 B1 EP 0094928B1 EP 83890059 A EP83890059 A EP 83890059A EP 83890059 A EP83890059 A EP 83890059A EP 0094928 B1 EP0094928 B1 EP 0094928B1
Authority
EP
European Patent Office
Prior art keywords
lock chamber
star wheel
outlet
cellular wheel
discharge apparatus
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
Application number
EP83890059A
Other languages
German (de)
English (en)
Other versions
EP0094928A3 (en
EP0094928A2 (fr
Inventor
Martin Nagl
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0094928A2 publication Critical patent/EP0094928A2/fr
Publication of EP0094928A3 publication Critical patent/EP0094928A3/de
Application granted granted Critical
Publication of EP0094928B1 publication Critical patent/EP0094928B1/fr
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/21—Arrangements of devices for discharging
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces

Definitions

  • the invention relates to a discharge device for a shaft furnace, consisting of a lock chamber connected to the shaft furnace by means of a conveying line, in which a cell wheel receiving the furnace material, closing the lock chamber inlet from the lock chamber outlet and having star-shaped cell walls is drivably mounted, the feed line being connected to a sealing gas -Pressure source is connected.
  • lock chambers are provided via a delivery line connected to the shaft furnace, in which a rotor consisting of a drum is rotatably mounted.
  • This drum has a passage opening in a circumferential area for receiving or delivering the furnace material. If the passage opening of the drum matches the lock chamber inlet, the furnace material is brought into the drum from the shaft furnace.
  • the lock chamber inlet is closed by the drum jacket and the lock chamber outlet is opened when the passage opening in the drum jacket reaches the area of the lock chamber outlet, and the furnace material can fall out of the drum through the lock chamber outlet.
  • the main disadvantage of this arrangement of a drum is that the furnace material cannot be conveyed continuously through the lock chamber and that there is no security against undesired escape of furnace gas through the lock chamber.
  • the rotation of the drum means that no material is conveyed between the lock chamber inlet and outlet, because the furnace material is either rotated with the drum or rolls on the inside wall of the drum.
  • the invention has for its object to a discharge device of the type described. improve that the gas-tight furnace closure required for hot material discharge in the area of the lock chamber can be ensured with simple means.
  • the invention solves this problem in that the lock chamber between the lock chamber inlet and the lock chamber outlet has an exhaust pipe in the delivery area of the cellular wheel and that the angular distance between two successive cell walls of the cellular wheel is smaller than the angular distances of the exhaust pipe on the one hand from the lock chamber inlet and on the other hand from the lock chamber outlet.
  • Exhaust gas line between the lock chamber inlet and the lock chamber outlet in the delivery area of the cellular wheel can be effectively prevented that appropriate amounts of sealing gas are discharged through the lock chamber with the furnace material.
  • the sealing gas must at least have a pressure equal to the pressure of the furnace gas in order to prevent the furnace gas from reaching the lock chamber and a pressure loss in the furnace. This means that a corresponding pressure of the sealing gas is present in the delivery line between the shaft furnace and the lock chamber. can be set up with little effort, a direct connection between the delivery line and the exhaust line on the one hand and between the exhaust line and the lock chamber outlet on the other hand must be prevented via a cell chamber of the cellular wheel.
  • the angular distance between two successive cell walls of the cellular wheel on the angular distances of the exhaust pipe is on the one hand from the sluice lowering chamber inlet and on the other hand matched by the lock chamber outlet, so that there is at least one cell wall between the exhaust pipe and the lock chamber inlet or outlet in each rotational position of the cellular wheel.
  • the angular distance between the exhaust pipe and the lock chamber outlet can be selected to be greater than twice the angular distance between two successive cell walls.
  • the necessary pressure reduction in the lock chamber is based on the fact that the cell walls connect to the peripheral wall of the lock chamber and form a seal between the lock chamber inlet and the lock chamber outlet.
  • this closure cannot be completely gas-tight due to the necessary play between the cell wheel and the lock chamber, the sealing gas will also penetrate into the lock chamber against the conveying direction of the cell wheel between the cell walls of the cell wheel and the lock chamber wall. So that this sealing gas component can also be prevented from escaping from the lock chamber, an exhaust line can also be connected to the lock chamber between the lock chamber inlet and the lock chamber outlet in the return area of the cellular wheel.
  • the cellular wheel Since, according to the invention, the cellular wheel is not used for metering purposes, but rather for closing a lock chamber as gas-tight as possible, the cell walls of the cellular wheel must be brought close to the lock chamber wall.
  • the comparatively high temperatures of the furnace material passing through the lock chamber for example 750 ° C., must be taken into account. Because of these high material temperatures, heat radiation cannot be avoided despite good thermal insulation, so that it must be expected that the walls of the lock chamber will have a lower temperature than the cellular wheel stored in the lock chamber.
  • the associated different thermal expansions must not call into question the rotatability of the cellular wheel, so that sufficient expansion play must be provided between the cellular wheel and the lock chamber, especially with regard to starting from the cold state up to the full operating temperature.
  • the axial expansion play of the cellular wheel relative to the lock chamber can remain irrelevant for the gas-tight closure of the lock chamber by the cellular wheel if the cellular wheel consists of two end disks between which the cell walls are inserted. These end disks close the cell chambers in a gas-tight manner in the axial direction, so that no consideration has to be taken of connecting the cell walls to the end walls of the lock chamber.
  • the end disks of the cellular wheel can consequently be arranged at a distance from the end walls of the lock chamber that absorbs the thermal expansion of the cellular wheel with respect to the lock chamber, without sacrificing the tightness of the lock.
  • this axial distance between the end disks of the cellular wheel and the end walls of the lock chamber results in a possible flow channel for the sealing gas passing between the end disks of the cellular wheel and the peripheral wall of the lock chamber, which is no longer in the area of the exhaust pipes, but in the area of the lock chamber outlet reached.
  • the end disks of the cellular wheel in a further embodiment of the invention carry at least one ring flange projecting against the end wall of the lock chamber, which overlaps a counter flange on the end wall of the lock chamber to form a sealing gap on the outside. Since the ring flange and the counter flange are located concentrically next to one another, the axial expansion possibility of the cellular wheel is not restricted by this closure of the end space between the cellular wheel and the lock chamber.
  • the enlargement of the sealing gap between the ring flanges and the counter flanges that occurs during start-up does not cause any disturbing impairment with regard to the tightness of the lock, because with the enlargement of this sealing gap due to the greater radial expansion of the cellular wheel, the radial gaps between the cell walls and the front disks of the cellular wheel on the one hand and the peripheral wall of the lock chamber on the other hand become smaller, so that the sealing effect can be regarded as approximately constant in all operating states.
  • the high temperature of the furnace material, which should be conveyed through the lock chamber without any loss of heat, requires a comparatively high thermal load on the bearings for the shaft of the cellular wheel.
  • At least one ring channel for a coolant can be provided between the lock chamber and the shaft of the cellular wheel on the side of the bearings for the shaft of the cellular wheel facing the cellular wheel. This measure not only allows the bearing temperature to be reduced, but also provides additional security against leakage of gas from the shaft bearings. Particularly favorable conditions are created if two ring channels are provided axially one behind the other in order to carry out step-by-step cooling first with a cold inert gas and then with a cooling liquid, for example water.
  • the lock chamber carries an annular flange projecting axially against the front disk, which overlaps a counter flange on the front disk with the interposition of a sealing slide ring on the outside, so very simple constructional relationships are ensured without the necessary expansion possibility of the cellular wheel with respect to the lock chamber jeopardize the tight closure of the ring channel with respect to the lock chamber.
  • the expansion of the cellular wheel relative to the lock chamber causes the slide ring clamped between the flanges to compress, which accordingly has to yield elastically. Due to the greater pressing force on the slide ring, the tight seal of the ring channel is even increased.
  • the conveying device for discharging the hot furnace material is connected via a conveyor line 1 to a lock chamber 2 in which a cellular wheel 3 can be driven is stored.
  • This cellular wheel 3 consists of two end disks 5 seated on a shaft 4, between which the cell walls 6 are inserted.
  • the arrangement is such that the front disks 5 are provided with an axial distance from the end walls 7 of the lock chamber 2, while the radial gap 8 (see in particular Fig.
  • the annular space 10 which results between the end walls 7 of the lock chamber 2 and the front disks 5 of the cellular wheel 3 is closed off in the area of the outer circumference of the cellular wheel 3 by a gap seal which consists of two annular flanges 11 arranged at a radial distance from one another on the front disks 5 of the cellular wheel 3 and two corresponding counter flanges 12 is formed on the end walls 7 of the lock chamber 2.
  • two ring channels 15 and 16 are provided on the side of the bearing 14 facing the cellular wheel 3 between the lock chamber 2 and the shaft 4, into which a coolant can be introduced.
  • the lock chamber 2 in each case forms an annular flange 17 projecting axially against the front disk 5, which overlaps a counter flange 18 on the front disk 5 of the cellular wheel 3 on the outside at a radial distance, between the ring flange 17 and the Counter flange 18 is a sealing ring 19 is used sealingly, which consists for example of a graphite-asbestos mixture.
  • the slide ring 19 between the flanges 17 and 18 is compressed more, which increases the tightness of the annular channel 15 with respect to the lock chamber 2 and the annular space 10 increases without affecting the rotatability of the cellular wheel 3, because the sliding ring 19 can yield elastically.
  • the coolant which consists of a cold inert gas and is introduced into the annular space 15 via lines 20, dissipates the absorbed heat via the lines 21.
  • the annular channel 16, which is separated from the annular channel 15, is filled via the supply lines 22 with cooling water which is discharged via an axial bore 24 of the shaft 4 connected to the annular channel 16 by radial bores 23.
  • the axial bore 24 is extended by an extension tube 26 which slidably engages in a connecting piece 25.
  • a graduated cooling system is thus available for dissipating the heat, which ensures permissible operating temperatures for the bearings of the shaft 4 of the cellular wheel 3.
  • the delivery line 1 is connected to a sealing gas pressure source by means of a pipe connection 27, so that a sealing gas pressure greater than the furnace gas pressure can be built up in the delivery line 1.
  • the barrier gas pressure must be reduced within the lock chamber 2 in order to largely prevent the barrier gas from escaping from the lock chamber 2. This is effected with the aid of the cellular wheel 3, an exhaust line 30 being provided between the lock chamber inlet 28 and the lock chamber outlet 29 both in the delivery area of the cellular wheel 3 and in the opposite return area, which leads the sealing gas penetrating into the lock chamber 2 into an existing gas circuit. Since the sealing gas has to be heated in order to avoid cooling of the furnace material, recycling the sealing gas is of considerable economic importance.
  • the flow path between the lock chamber inlet 28 and the exhaust pipes 30 must therefore always be interrupted by at least one cell wall 6.
  • the angular distance a between two successive cell walls 6 of the cellular wheel 3 must be selected to be smaller than the angular distances ⁇ of the exhaust pipes 30 from the lock chamber inlet 28.
  • the same condition applies to the angular distance of the exhaust pipes 30 from the lock chamber outlet 29 in order to prevent the passage of sealing gas to the lock chamber outlet 29. If there are two or more cell walls between the exhaust gas lines 30 and the lock chamber outlet 29, the security against an undesired sealing gas outlet is increased.
  • the cellular wheel 3 which can be driven via a chain wheel 31, conveys the hot furnace material through the lock chamber 2, whereby due to the completion of the free passage between the lock chamber inlet 28 and the lock chamber outlet 29 through the cellular wheel 3, a certain barrier pressure in the region of the delivery line is maintained can be obtained.
  • the lock chamber 2 receiving the cellular wheel 3 consequently acts as a pressure lock, which allows the hot furnace material to pass through, so that a continuous furnace discharge can be ensured without having to fear discharge of the furnace gas.
  • the lock chamber 2 has a corresponding thermal insulation 32, which, however, cannot prevent a temperature difference between the cell wheel 3 and the lock chamber 2, which occurs in particular when the pressure lock is started from the cold Condition becomes noticeable by subjecting the cellular wheel 3 to greater thermal expansion. This greater thermal expansion is compensated for by appropriate expansion compensation without endangering the lock effect.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Claims (7)

1. Dispositif de défournement pour un four à cuve, formé d'une chambre de sas (2) qui est reliée au four à cuve au moyen d'une conduite de transport et dans laquelle est montée, de manière à pouvoir être entraînée, une roue cellulaire (3) recevant le produit du four, isolant l'entrée (28) de la chambre de sas de la sortie (29) de la chambre de sas, avec parois de cellules (6) disposées en étoile, la conduite de transport (1) étant raccordée à une source de pression de gaz de barrage, caractérisé par le fait que la chambre de sas (2) présente, entre l'entrée (28) de la chambre de sas et la partie (29) de la chambre de sas, une conduite à gaz résiduaires (30) dans la région de transport de la roue cellulaire (3) et que l'espacement angulaire (alpha) entre deux parois de cellules successives (6) de la roue cellulaire (3) est plus petit que les espacements angulaires (bêta) entre la conduite à gaz résiduaire (30) et l'entrée (28) de la chambre de sas d'une part et la sortie (29) de la chambre de sas, d'autre part.
2. Dispositif de défournement selon la revendication 1, caractérisé par le fait que l'espacement angulaire entre la conduite à gaz résiduaires (30) et la sortie (29) de la chambre de sas (2) est plus grand que le double de l'espacement angulaire entre deux parois de cellules successives (6).
3. Dispositif de défournement selon la revendication 1 ou 2, caractérisé par le fait qu'à la chambre de sas (2) est également raccordée, entre l'entrée (28) de la chambre de sas et la sortie (29) de la chambre de sas, dans la zone de refoulement de la roue ceitutaire (3). une conduite à gaz résiduaires (30).
4. Dispositif de défournement selon l'une des revendications 1 à 3, caractérisé par le fait que la roue cellulaire (3) est formée de deux disques frontaux (5) entre lesquels sont insérées les parois de cellules (6).
5. Dispositif de défournement selon la revendication 4, caractérisé par le fait que les disques frontaux (5) de la roue cellulaire (3) sont disposés avec espacement axial de la paroi frontale correspondante (7) de la chambre de sas (2) et portent au moins un rebord annulaire (11) faisant saillie vers la paroi frontale (7) de la chambre de sas (2) et qui s'applique extérieurement par dessus un rebord opposé (12) de la paroi frontale (7) de la chambre de sas (2) avec formation d'un interstice d'étanchéité (13).
6. Dispositif de défournement selon l'une des revendications 1 à 5, caractérisé par le fait qu'entre la chambre de sas (2) et l'arbre (4) de la roue cellulaire (3) est prévu, sur le côté des paliers (14) de l'arbre (4) de la roue cellulaire (3) qui est tourné vers la roue cellulaire (3), au moins un canal annulaire (15, 16) pour un agent de refroidissement.
7. Dispositif de défournement selon les revendications 4 à 6, caractérisé par le fait que le canal annulaire (15) se raccorde chaque fois au disque frontal (5) de la roue cellulaire (3), la chambre de sas (2) portant un rebord annulaire (17) faisant saillie axialement vers le disque frontal (5) et qui s'applique par dessus un rebord opposé (18) du disque frontal (5) avec interposition d'un anneau de glissement (19) assurant l'étanchéité.
EP83890059A 1982-05-18 1983-04-20 Dispositif de déchargement pour un four à cuve Expired EP0094928B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1958/82 1982-05-18
AT0195882A AT374275B (de) 1982-05-18 1982-05-18 Austragungsvorrichtung fuer einen schachtofen

Publications (3)

Publication Number Publication Date
EP0094928A2 EP0094928A2 (fr) 1983-11-23
EP0094928A3 EP0094928A3 (en) 1984-04-18
EP0094928B1 true EP0094928B1 (fr) 1986-07-30

Family

ID=3524722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83890059A Expired EP0094928B1 (fr) 1982-05-18 1983-04-20 Dispositif de déchargement pour un four à cuve

Country Status (6)

Country Link
US (1) US4507079A (fr)
EP (1) EP0094928B1 (fr)
JP (1) JPS58213180A (fr)
AT (1) AT374275B (fr)
CA (1) CA1212541A (fr)
DE (1) DE3364880D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT382712B (de) * 1985-05-10 1987-04-10 Voest Alpine Ag Beschickungsvorrichtung fuer einen schachtofen zum brennen von karbonathaltigem, mineralischem brenngut
IT1262034B (it) * 1993-10-07 1996-06-18 In Tec Italia Int Env Tech Srl Dispositivo e procedimento per il pretrattamento di rottami di circuiti elettronici.
JP3623016B2 (ja) * 1995-06-09 2005-02-23 株式会社チサキ 竪型焼成炉
AT14432U1 (de) * 2014-06-05 2015-11-15 Binder Co Ag Verfahren zur Expansion von sandkornförmigem Rohmaterial

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE333699C (de) * 1919-07-29 1921-03-03 Fried Krupp Akt Ges Entleerungsvorrichtung fuer unter Druck stehende Schachtoefen, Silos o. dgl.
DE337622C (de) * 1919-11-05 1921-06-03 Arno Andreas Umlaufende Entleerungstrommel fuer Schachtoefen
DE338413C (de) * 1919-12-13 1921-06-17 Arno Andreas Umlaufende Entleerungstrommel fuer Schachtoefen
DE345027C (de) * 1920-12-24 1921-12-05 Arno Andreas Umlaufende Entleerungstrommel fuer Schachtoefen
US1850009A (en) * 1928-05-23 1932-03-15 Gronwall Eugen Assar Alexis Reduction of metals out of their ores
DE545354C (de) * 1929-04-24 1932-02-29 William Henry Smith Verfahren und Vorrichtung zum Reduzieren von Erzen, insbesondere Eisenerzen
US2072450A (en) * 1932-05-13 1937-03-02 Philadelphia & Reading Coal & Furnace
DE1272945B (de) * 1959-10-20 1968-07-18 Metallurg D Imphy Soc Verfahren zum unmittelbaren Reduzieren von zerkleinertem Eisenerz
FR1374753A (fr) * 1963-11-13 1964-10-09 Dispositif d'alimentation pour four
GB1170360A (en) * 1966-09-28 1969-11-12 Anglo Amer Corp South Africa Improvements in the Segregation Process for the Treatment of Ores
US3850616A (en) * 1973-10-29 1974-11-26 Armco Steel Corp Inert gas seal for product discharge from a shaft furnace
US4073629A (en) * 1974-07-30 1978-02-14 Kamyr Inc. Coal gasification process with improved procedure for continuously discharging ash particles and apparatus therefor

Also Published As

Publication number Publication date
AT374275B (de) 1984-04-10
DE3364880D1 (en) 1986-09-04
EP0094928A3 (en) 1984-04-18
CA1212541A (fr) 1986-10-14
EP0094928A2 (fr) 1983-11-23
ATA195882A (de) 1983-08-15
US4507079A (en) 1985-03-26
JPS58213180A (ja) 1983-12-12

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