EP2502014B1 - Procédé et dispositif de fabrication d'anodes - Google Patents

Procédé et dispositif de fabrication d'anodes Download PDF

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Publication number
EP2502014B1
EP2502014B1 EP10785014.1A EP10785014A EP2502014B1 EP 2502014 B1 EP2502014 B1 EP 2502014B1 EP 10785014 A EP10785014 A EP 10785014A EP 2502014 B1 EP2502014 B1 EP 2502014B1
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EP
European Patent Office
Prior art keywords
secondary air
feeding device
kiln
zone
air feeding
Prior art date
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Application number
EP10785014.1A
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German (de)
English (en)
Other versions
EP2502014A1 (fr
Inventor
Domenico Di Lisa
Frank Heinke
Peter Krieg
Detlef Maiwald
Hans-Peter Mnikoleiski
Wolfgang Uhrig
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.)
Innovatherm Prof Dr Leisenberg GmbH and Co KG
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Innovatherm Prof Dr Leisenberg GmbH and Co KG
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    • 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
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge
    • F27B13/02—Furnaces with both stationary charge and progression of heating, e.g. of ring type, of type in which segmental kiln moves over stationary charge of multiple-chamber type with permanent partitions; Combinations of furnaces

Definitions

  • the present invention relates to a method for producing anodes in an anode ring furnace, comprising at least one furnace unit with a heating zone, a fire zone and a cooling zone, each with a plurality of furnace chambers connected to one another with heating channels, which are designed as heat exchangers and for receiving anodes serve, in which air is passed through the furnace unit by means of an air supply device into the cooling zone and after passing through the fire zone by means of a suction device is discharged from the heating zone as flue gas. Furthermore, the invention relates to an air supply device for an anode ring furnace and an anode ring furnace provided with such an air supply device.
  • the present method is used in the production of anodes which are required for melt flow electrolysis for the production of primary aluminum.
  • These anodes are made from petroleum coke with the addition of pitch as a binder in a molding process called “green anodes” or “raw anodes”, which follows the sintering process in an anode ring furnace.
  • This sintering process takes place in a defined heat treatment process in which the anodes go through three phases, namely a heating phase, a sintering phase and a cooling phase.
  • the raw anodes are heated or preheated in the heating zone before they are heated to sintering temperatures of approximately 1100 ° C. in the firing or fire zone after the heating phase has ended.
  • the disclosure DE 2010 372 A1 discloses a method for burning shaped carbon bodies in chamber ring furnaces, in which those chambers which have a critical temperature can be selectively cooled.
  • the cooling is preferably carried out by spraying water into the respective chamber, so that an increase in temperature is limited and thus formation of cracks or other structural defects in the firing material can be avoided.
  • EP 0 541 165 A2 describes a method for controlling the exhaust air in a ring furnace for burning bodies made of carbon.
  • An additional ring channel is installed, to which the individual oven chambers are connected during the cooling phase, thus enabling thermal control of the cooling process.
  • WO 2010/128226 A1 and in the WO 2004/027332 A1 describes openings in the ceiling of an anode ring furnace, which are also used for the supply of secondary air.
  • the present invention is therefore based on the object of proposing a method or a device which makes it possible to produce anodes of high density with high product quality in an anode ring furnace.
  • secondary air is supplied in the heating zone of the suction device upstream by means of a secondary air supply device. Due to the supply of secondary air to the heating zone, it is possible to specifically influence the heating gradients in the heating zone that are otherwise dependent solely on the air flow in the furnace from the physics of the furnace vessel, in particular from the nature and geometry of the heating channels of the furnace vessel. In particular, it is possible to achieve the reduction in the heating gradient desired for heating high-density raw anodes by supplying the secondary air to the heating zone.
  • the supply of secondary air in the heating zone increases the oxygen content in the flue gas, so that even with high density anodes that have a higher percentage of pitch, a complete combustion of the pitch can be achieved , which would not be possible without the supply of secondary air.
  • the secondary air supply device is positioned as a function of at least one Process parameters so that, for example, at the beginning of the fire cycle, the secondary air supply device is positioned as far as possible from the fire zone within the heating zone, or at the end of the fire cycle, the secondary air supply device is arranged in a correspondingly closely adjacent manner to the fire zone.
  • the process parameters can be used to set the secondary air supply in order, for example, to gain empirically gained knowledge regarding the relationship between certain process parameters and the heating gradient that arises to use in the preheating zone.
  • the secondary air can be supplied as a function of the oven temperature in one or more oven chambers of the heating zone.
  • the secondary air can be supplied as a function of the negative pressure in the heating zone.
  • a particularly direct control of the secondary air supply becomes possible if the secondary air supply takes place as a function of a measurement value determination for the heating gradient.
  • the air supply device according to the invention has the features of claim 9.
  • a secondary air supply device in addition to the primary air supply device for supplying primary air in the cooling zone, a secondary air supply device is provided for arrangement in the heating zone.
  • the secondary air supply device of the air supply device has a positioning device for the variable positioning of the secondary air supply device in the heating zone, changes in the positioning of the secondary air supply device can be made depending on the process parameters.
  • An air supply device the secondary air supply device of which is designed in such a way that it enables several furnace chambers to be acted upon, can further increase the effectiveness of influencing the heating gradient.
  • the air supply device is constructed in such a way that the secondary air supply device is assigned at least one measuring device that generates a measurement of a process parameter as an input variable for a control device of the secondary air supply device, an autonomous system provided with all the necessary devices can be created, for example on a existing anode ring furnace can be easily retrofitted.
  • the anode ring furnace according to the invention has the features of claim 13.
  • the anode ring furnace is provided with an air supply device which enables the burning or sintering of high-density anodes with the same productivity as the sintering of low-density anodes.
  • Fig. 1 shows an anode ring furnace 10, which regularly consists of a plurality of furnace units 11, which are also referred to as so-called "fire".
  • each oven unit 11 has 12 oven chambers 12, which are combined in different numbers to form a heating zone 13, a fire zone 14 and a cooling zone 15.
  • the furnace chambers 12 have pits 16, each on both sides of in the longitudinal direction of the furnace unit 11 ( Fig. 1 ) Extending heating channels 17 are limited.
  • the pits 16 serve to receive anodes 30, which are received in a row arrangement in the pits 16.
  • the heating channels 17 of the furnace chambers 12 are connected to one another in the longitudinal direction of the furnace unit 11 by flow channels 31.
  • Fig. 1 shows, there is a number of different devices above the furnace chambers 12, the positioning of which in relation to the furnace chambers 12 can be changed in the circumferential direction 18 and - as will be explained below - the location of the heating zone 13, fire zone 14 and cooling zone 15 through their respective assignment define, which are advanced together with the devices in the direction of rotation 18.
  • the furnace unit 11 in the fire zone 14 is provided with three burner devices 19.
  • the burner devices 19 are each assigned to a furnace chamber 12, the pits 16 of which are equipped with raw anodes, which are heated to approximately 1100 ° C. by means of the temperature applied by the burner devices 19 and sintered to produce anodes that can be used for melt flow electrolysis.
  • the anodes are not subjected to temperature directly via the burner devices 19, but instead heat is transferred from the air carried in the heating channels 17 via heating channel walls 20 to the anodes arranged in the pits 16.
  • the furnace chambers 12 therefore function as heat exchangers.
  • the cooling zone 15 which in the present case comprises six furnace chambers 12, in which the raw anodes have been sintered under high temperature in two previous firing phases, in which the burner devices 19 were in the appropriate position.
  • a primary air supply device 21 by means of which the heating channels 17 can be supplied with fresh or ambient air.
  • a suction device 22 in the heating zone 13 (see also Fig. 2 ) arranged for the flue gases above the furnace chambers 12, in which there are not yet raw raw anodes exposed to high temperatures by the burner devices 19.
  • the corresponding waste heat is supplied with fresh air through the primary air supply device 21 by means of the suction device 22 arranged in the heating zone 13 to the heating zone 13 and is used there to preheat the anodes before they are subsequently subjected to the burner devices 19.
  • the function of the primary air supply device 21 and the suction device 22 is matched to one another by suitable throttling and control devices in such a way that, in addition to a controlled fuel supply to the burner devices 19, a predetermined temperature-time profile is set in the heating channels running between the pits 16.
  • the anode ring furnace 10 or the furnace unit 11 shown as an example has an air supply device 23 which, in addition to the primary air supply device 21, comprises a secondary air supply device 24 arranged in the heating zone 13.
  • the secondary air supply device 24 is provided with a measuring device 25 with which process parameters, such as, for example, the temperature and / or the negative pressure, are recorded in the heating zone 13 and transmitted as input variables to a control device 26 of the secondary air supply device 24, which regulates the air volume flow introduced into the heating zone 13 via the secondary air supply device 24.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)

Claims (11)

  1. Procédé de production d'anodes dans un four circulaire (10) comprenant au moins une unité de four (« feu ») (11) ayant une zone de chauffage (13), une zone de feu (14) et une zone de refroidissement (15), ayant chacune une pluralité de chambres de four (12) qui sont reliées par des canaux de chauffage (17), sont réalisées comme échangeurs de chaleur et servent à recevoir des anodes, de l'air primaire étant introduit dans la zone de refroidissement au moyen d'un dispositif d'alimentation en air primaire (21) pour le passage de l'air à travers l'unité de four et, après passage à travers la zone de feu, l'air primaire étant évacué de la zone de chauffage comme gaz de fumée au moyen d'un dispositif d'évacuation (22), de l'air secondaire étant introduit dans la zone de chauffage dans la direction de l'écoulement d'air primaire en amont du dispositif d'évacuation au moyen d'un dispositif d'alimentation en air secondaire (24), la teneur en oxygène dans le gaz de fumée étant augmentée,
    caractérisé en ce que
    le dispositif d'alimentation en air secondaire (24) est positionné en fonction d'au moins un paramètre de processus.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    plusieurs chambres de four de la zone de chauffage sont alimentées par le dispositif d'alimentation en air secondaire (24).
  3. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'air secondaire est introduit en fonction d'au moins un paramètre de processus.
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'air secondaire est introduit en fonction de la température dans une ou plusieurs chambres de four (12) de la zone de chauffage (13).
  5. Procédé selon la revendication 3 ou 4,
    caractérisé en ce que
    l'air secondaire est introduit en fonction du vide dans la zone de chauffage (13).
  6. Procédé selon l'une quelconque des revendications 3 à 5,
    caractérisé en ce que
    l'air secondaire est introduit en fonction de la durée de cycle du traitement thermique des anodes.
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'air secondaire est introduit en fonction d'une détermination de valeur mesurée du gradient de chauffage.
  8. Dispositif d'alimentation en air pour un four circulaire pour la production d'anodes, un dispositif d'alimentation en air secondaire (24) destiné à introduire de l'air secondaire dans une zone de chauffage (13) d'une unité de four et ainsi à augmenter la teneur en oxygène étant prévu en plus d'un dispositif d'alimentation en air primaire (21) destiné à introduire de l'air dans une zone de refroidissement (15) de l'unité de four (11),
    caractérisé en ce que
    le dispositif d'alimentation en air secondaire (24) est muni d'un dispositif de positionnement destiné à positionner le dispositif d'alimentation en air secondaire de manière variable dans la zone de chauffage (13).
  9. Dispositif d'alimentation en air selon la revendication 8,
    caractérisé en ce que
    le dispositif d'alimentation en air secondaire (24) est réalisé de telle manière que plusieurs chambres de four (12) peuvent être alimentées.
  10. Dispositif d'alimentation en air selon l'une quelconque des revendications 8 ou 9,
    caractérisé en ce
    qu'au moins un dispositif de mesure (25) est assigné au dispositif d'alimentation en air secondaire (24) et produit une valeur mesurée d'un paramètre de processus comme valeur d'entrée pour un dispositif de commande (26) du dispositif d'alimentation en air secondaire.
  11. Four circulaire pour la production d'anodes,
    caractérisé par
    un dispositif d'alimentation en air selon l'une quelconque des revendications 8 à 10.
EP10785014.1A 2009-11-20 2010-11-15 Procédé et dispositif de fabrication d'anodes Active EP2502014B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009046937.0A DE102009046937B4 (de) 2009-11-20 2009-11-20 Verfahren und Vorrichtung zur Herstellung von Anoden
PCT/EP2010/067512 WO2011061159A1 (fr) 2009-11-20 2010-11-15 Procédé et dispositif de fabrication d'anodes

Publications (2)

Publication Number Publication Date
EP2502014A1 EP2502014A1 (fr) 2012-09-26
EP2502014B1 true EP2502014B1 (fr) 2020-04-29

Family

ID=43618773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10785014.1A Active EP2502014B1 (fr) 2009-11-20 2010-11-15 Procédé et dispositif de fabrication d'anodes

Country Status (6)

Country Link
US (1) US9328960B2 (fr)
EP (1) EP2502014B1 (fr)
AU (1) AU2010320998B2 (fr)
CA (1) CA2780844C (fr)
DE (1) DE102009046937B4 (fr)
WO (1) WO2011061159A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110617712A (zh) * 2019-10-20 2019-12-27 单系夫 一种炭素原料回转煅烧方法和装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1330164A (en) * 1918-01-22 1920-02-10 Aluminum Co Of America Ring-furnace
DE2008206C3 (de) 1970-02-21 1974-05-02 Sigri Elektrographit Gmbh Verfahren zum Brennen von Kohlenstoff-Formkörpern in Kammerringöfen
DE2010372B2 (de) 1970-03-05 1976-11-04 Sigri Elektrographit Gmbh, 8901 Meitingen Verfahren zum brennen von kohlenstoff-formkoerpern in kammerringoefen
US4253823A (en) * 1979-05-17 1981-03-03 Alcan Research & Development Limited Procedure and apparatus for baking carbon bodies
DE3119517A1 (de) 1981-05-15 1982-12-02 Årdal og Sunndal Verk a.s., Oslo Verfahren zum brennen oder calcinieren von kohlebloecken in einem ringkammerofen unter zurueckfuehrung des rauchgases sowie eine vorrichtung zur durchfuehrung des verfahrens
US4382778A (en) * 1981-09-04 1983-05-10 Noranda Mines Limited Method and apparatus for reducing excess air inleakage into an open ring-type carbon baking furnace
FR2515799B1 (fr) * 1981-10-29 1986-04-04 Pechiney Aluminium Dispositif de chauffage pour fours de cuisson ouverts a feu tournant et procede de mise en oeuvre de ce dispositif
US4687439A (en) * 1986-02-28 1987-08-18 Aluminum Company Of America & Delta Refractories, Inc. Furnaces for baking anodes
ES2010215B3 (es) * 1986-06-17 1989-11-01 Pechiney Aluminium Dispositivo y procedimiento de optimizacion de la combustion en los hornos con camaras para la coccion de bloques carbonados.
NO174364C (no) * 1991-11-06 1994-04-20 Norsk Hydro As Anordning ved ringkammerovn
NO180215C (no) * 1995-02-10 1997-03-05 Norsk Hydro As Anordning ved mottrykksvifte i en ringkammerovn
CH695870A5 (de) 2002-09-23 2006-09-29 R & D Carbon Ltd Optimierung der Pechdampfverbrennung in einem Brennofen für Kohlenstoffelektroden.
FR2918164B1 (fr) * 2007-06-29 2009-09-25 Solios Environnement Sa Procede de surveillance d'un conduit des fumees reliant un four de cuisson de blocs carbones a un centre de traitement des fumees
CA2699825C (fr) * 2007-09-18 2014-06-17 Wolfgang Leisenberg Procede et dispositif de recuperation de chaleur
FR2946737B1 (fr) 2009-06-15 2013-11-15 Alcan Int Ltd Procede de regulation d'un four de cuisson de blocs carbones et four adapte a sa mise en oeuvre.
US9970710B2 (en) * 2012-06-15 2018-05-15 Fluor Technologies Corporation Carbon baking heat recovery ring furnace

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102009046937A1 (de) 2011-05-26
US20120295208A1 (en) 2012-11-22
US9328960B2 (en) 2016-05-03
CA2780844A1 (fr) 2011-05-26
DE102009046937B4 (de) 2019-12-05
AU2010320998B2 (en) 2014-08-07
CA2780844C (fr) 2018-06-05
AU2010320998A1 (en) 2012-06-14
EP2502014A1 (fr) 2012-09-26
WO2011061159A1 (fr) 2011-05-26

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