EP0627606A2 - Dispositif de préchauffage - Google Patents

Dispositif de préchauffage Download PDF

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Publication number
EP0627606A2
EP0627606A2 EP94106297A EP94106297A EP0627606A2 EP 0627606 A2 EP0627606 A2 EP 0627606A2 EP 94106297 A EP94106297 A EP 94106297A EP 94106297 A EP94106297 A EP 94106297A EP 0627606 A2 EP0627606 A2 EP 0627606A2
Authority
EP
European Patent Office
Prior art keywords
silo housing
electrodes
core
silo
housing
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
EP94106297A
Other languages
German (de)
English (en)
Other versions
EP0627606B1 (fr
EP0627606A3 (fr
Inventor
Werner Fischer
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.)
Maschinenfabrik Gustav Eirich GmbH and Co KG
Original Assignee
Maschinenfabrik Gustav Eirich GmbH and Co KG
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 Maschinenfabrik Gustav Eirich GmbH and Co KG filed Critical Maschinenfabrik Gustav Eirich GmbH and Co KG
Publication of EP0627606A2 publication Critical patent/EP0627606A2/fr
Publication of EP0627606A3 publication Critical patent/EP0627606A3/fr
Application granted granted Critical
Publication of EP0627606B1 publication Critical patent/EP0627606B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F27D3/10—Charging directly from hoppers or shoots
    • 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
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • 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
    • F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0008—Resistor heating

Definitions

  • the invention relates to a device for preheating dry substances according to the preamble of patent claim 1.
  • Masses for the production of electrodes (anodes, cathodes) for the production of aluminum by melt flow electrolysis consist of dry substances - dry substances are mixtures of petroleum coke and granularly prepared electrode residues - to which pitch is added as a binder immediately before shaping. Masses of this composition are also called green masses, from which the electrodes are formed and then fired.
  • the drying agent has to be heated, in this context we speak of preheating, which happens in so-called preheaters, into which drying agents are conveyed in one end via dosing cars, the material to be conveyed is heated in the preheater, and from which, at the other end, heated drying agents are applied in the direction of mixers. Heating screws, heating silos and heating drums are known as preheaters.
  • the invention has a heating silo to the subject.
  • a heating silo is known - in technical terms they are known as batch preheaters - in which dry material is preheated by means of electrical resistance heating.
  • a plurality of electrodes arranged one above the other - penetrating through the preheater walls in an insulated manner - are provided for introducing and discharging the current flowing through and thus heating up the dry substance (direct or alternating current).
  • the known, polygonal device is characterized by an inhomogeneous mass flow, and uneven heating, which leads to the graphitization of undissolved material on the electrodes and the insulation blowing through.
  • the inventor has set himself the task of creating a preheater of the type mentioned above by uniformly heating dry substance through a homogeneous mass flow, and the object is achieved by means of the characterizing features of claim 1.
  • the invention should also include arranging two preheaters in such a way that repairs can be carried out by means of the shortest possible standstill periods of the entire system for green masses.
  • Fig. 1 shows schematically two preheaters 10, 11 which are arranged on a frame 12.
  • the preheater 10 is arranged below a continuously operating balance 13 and above a continuously operating mixer 14.
  • the preheater 10 and the mixer 14 are fed from the scale 13 via filling pipes 19 and 20.
  • the preheater 10 is connected to a rectifier 15 via electrodes 16, 17 and connecting cables 18.
  • Preheaters 10 and 11 are arranged on a horizontal frame 12 which is designed to be rotatable by 360% about a vertical axis of rotation 19.
  • the rectifier 15 can be removed (loosen the connection cable 18), the frame 12 rotated by 180% so that the preheater 11 moves under the scale 13 and over the mixer 14, and the connecting cable 18 again the electrodes 16, 17 (parts of the same type and function are identified by the same reference numerals) and preheater 11 are put into operation.
  • interruptions in operation can be kept to a minimum.
  • FIG. 2 shows preheaters 10 (in operation) and 11 (in operation) designed according to the invention.
  • the preheaters 10 and 11 are identical, so that the description is limited to that of the preheater 10.
  • the preheater 10 consists of a round hollow body 22, hereinafter also referred to as silo housing 22, which is formed from rings 23 arranged concentrically one above the other (six rings 23 in the illustrated case).
  • the concentricity is ensured by graded 24, 25 end faces, which fit into one another, center the rings 23 to each other, so that a steplessly round inner 26 and ace surface 27 of the silo housing 22 is formed.
  • the rings 23 forming the silo housing 22 consist of a heat-resistant, electrically non-conductive ceramic material, for example a heat-resistant (heat-resistant should be understood to be resistance up to 500 ° C.) concrete.
  • the silo housing 22, which is made of ceramic material is concentrically surrounded at a distance by a metallic jacket tube 28, which is held equidistantly on all sides via supports 29 to the silo housing 22.
  • the air space 30 thus established between the silo housing 22 and the metallic jacket tube 28 also serves for insulation purposes.
  • the silo housing 22 At the top, i.e. In the direction of the scale 13, the silo housing 22, the air space 30 and the casing tube 28 are closed by a removable cover 31 which has a central opening 32 through which the dry material emerging from the filling tube 19 is passed into the silo housing 22.
  • a removable cover 31 which has a central opening 32 through which the dry material emerging from the filling tube 19 is passed into the silo housing 22.
  • the silo housing 22 is likewise closed with a cover 33 with an opening 33a, into which the filling tube 20 flows.
  • a concentric core 31 is located concentrically within the silo housing 22 and runs in the same direction.
  • the core 34 consists of rings 35 which are held together by a tie rod 36 and an anchor plate 36a.
  • annular space 37 which is supplied at the top by a distribution cone 38 on the core 34 in equal quantities on all sides, the tip 39 of the distribution cone 38 being arranged concentrically with the opening 32 for this purpose is.
  • the rings 35 are made of the same ceramic material as the rings 23 of the silo housing 22.
  • inner electrodes 41 protrude into the annular space 37 on one or, as shown in the present exemplary embodiment, fastened on two rings 23. Two radially opposite, between them are shown Inner electrodes 41 receiving core 34.
  • a plurality of such inner electrodes 41 are provided on the inner circumference in uniform division, penetrating the annular space 37 as far as core 34, these electrodes 41 being connected to one another in an electrically conductive manner, ie in a current-conducting manner.
  • the upper electrode 16, which is connected to the rectifier 15, passes through (insulates) the jacket tube 28, the) air space 30 and connects rings to an inner electrode 41 or to the device for electrically connecting the inner electrodes 41.
  • the concentric and axial holding of the core 34 in the silo housing 22 can take place with respect to the concentricity by means of the inner electrodes 41, the axial holding could be attached to the upper end of the core 34 via a metallic ring 42 and by means of a shoulder 40 on the inner electrodes 41 lying on top, which could also serve as an electrical connection of the inner electrodes.
  • internal electrodes 43 are provided in the same configuration and arrangement, which are electrically conductively connected to a lower electrode 17, which is also connected to the rectifier 15.
  • 45 denotes a drive unit which, with a drive shaft 46, drives the cover 33 through a removal tool train 47 rotating between tie plate 36a and cover 33.
  • the removal tool 42 consists of a star (not shown in the top view) of a plurality of circularly curved arms 48, which remove dry matter and promote the removal into the filling tube 20 which eccentrically opens into the cover 33.
  • the mode of operation of the device according to the invention is briefly summarized as follows.
  • dry matter is evenly distributed to the annular space 37 through the opening 32 into the annular space 37, favored by the distribution cone 38.
  • a dry matter column in the form of an annular tube is formed which is externally limited by the inner diameter of the silo housing 22 and internally by the outer diameter of the core 34.
  • the removal tool 47 continuously removes dry substance at the bottom and conveys it through the filling tube in the direction of the mixer 14, so that the dry matter moves evenly from top to bottom.
  • current flows from the upper 41 to the lower inner electrodes 43 in the axial direction and is heated up to 300 ° C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Resistance Heating (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Drying Of Solid Materials (AREA)
  • Ceramic Products (AREA)
EP94106297A 1993-05-10 1994-04-22 Dispositif de préchauffage Expired - Lifetime EP0627606B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH143193 1993-05-10
CH143193 1993-05-10
CH1431/93 1993-05-10

Publications (3)

Publication Number Publication Date
EP0627606A2 true EP0627606A2 (fr) 1994-12-07
EP0627606A3 EP0627606A3 (fr) 1996-02-07
EP0627606B1 EP0627606B1 (fr) 1999-08-04

Family

ID=4210308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106297A Expired - Lifetime EP0627606B1 (fr) 1993-05-10 1994-04-22 Dispositif de préchauffage

Country Status (9)

Country Link
US (1) US5535236A (fr)
EP (1) EP0627606B1 (fr)
CN (1) CN1076469C (fr)
AU (1) AU671723B2 (fr)
CA (1) CA2122948C (fr)
DE (1) DE59408566D1 (fr)
NO (1) NO302201B1 (fr)
RU (1) RU2121639C1 (fr)
UA (1) UA27799C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010015496A1 (fr) * 2008-08-07 2010-02-11 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Dispositif de mélange avec chauffage par induction
CN101382392B (zh) * 2008-10-21 2010-06-16 鞍山市华杰建材技术开发有限公司 列管式预热器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9900253A (pt) 1999-02-02 2000-08-29 Companhia Brasileira Carbureto Recipiente de alumìnio e aço inoxidável a formação de eletrodos de autocozimento para a utilização em baixos-fornos elétricos de redução
BR9900252A (pt) 1999-02-02 2000-08-29 Companhia Brasileira Carbureto Recipiente de aço inoxidável para a formação de eletrodos de autocozimento para a utilização em baixos-fornos elétricos de redução
EP2546593B1 (fr) * 2011-07-12 2015-03-04 SMS Concast Italia S.p.A. Dispositif pour le transfert de matériau métallurgique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1047137A (en) * 1963-04-09 1966-11-02 Great Lakes Carbon Corp Apparatus and process for continuously making baked and/or graphitized carbon bodies,or for applying electrothermal energy to conductive compositions
DE2257483A1 (de) * 1972-11-23 1974-05-30 Sudawskij Ofen zur elektrodenherstellung
SU693100A1 (ru) * 1978-04-07 1979-10-25 Новокузнецкий алюминиевый завод Подогреватель токопровод щих сыпучих материалов
US4431503A (en) * 1981-06-22 1984-02-14 Metallurgical, Inc. Energy reduction in the manufacture of pre-baked carbon containing electrodes for electrolytic production of metals such as aluminum
ZA852705B (en) * 1984-10-18 1985-12-24 Custom Equip Corp Low temperature kiln
NO159960C (no) * 1986-07-08 1989-02-22 Norsk Hydro As Ovn for hoeytemperaturbehandling av plastiske eller forherdete produkter.
DE3824323A1 (de) * 1988-07-18 1990-01-25 Horst J Ing Grad Feist Verfahren zum grafitieren von rohlingen aus kohlenstoff zu graphitelektroden
AU643611B2 (en) * 1991-04-10 1993-11-18 Mintek Direct resistance heating electrical furnace assembly and method of operating same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010015496A1 (fr) * 2008-08-07 2010-02-11 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Dispositif de mélange avec chauffage par induction
CN102057748A (zh) * 2008-08-07 2011-05-11 德国古斯塔夫·爱立许机械制造有限公司 具有感应加热的混合装置
CN102057748B (zh) * 2008-08-07 2015-11-25 德国古斯塔夫·爱立许机械制造有限公司 具有感应加热的混合装置
US9295109B2 (en) 2008-08-07 2016-03-22 Maschinenfabrik Gustav Eirich Gmbh & Co., Kg Mixing device having induction heating
CN101382392B (zh) * 2008-10-21 2010-06-16 鞍山市华杰建材技术开发有限公司 列管式预热器

Also Published As

Publication number Publication date
EP0627606B1 (fr) 1999-08-04
CN1076469C (zh) 2001-12-19
NO941718D0 (no) 1994-05-09
CA2122948C (fr) 1999-09-21
AU671723B2 (en) 1996-09-05
CN1112233A (zh) 1995-11-22
UA27799C2 (uk) 2000-10-16
DE59408566D1 (de) 1999-09-09
EP0627606A3 (fr) 1996-02-07
NO941718L (no) 1994-11-11
RU2121639C1 (ru) 1998-11-10
NO302201B1 (no) 1998-02-02
CA2122948A1 (fr) 1994-11-11
US5535236A (en) 1996-07-09
AU6197094A (en) 1994-11-24
RU94015597A (ru) 1996-04-10

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