EP3312536B1 - Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired - Google Patents

Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired Download PDF

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Publication number
EP3312536B1
EP3312536B1 EP17190030.1A EP17190030A EP3312536B1 EP 3312536 B1 EP3312536 B1 EP 3312536B1 EP 17190030 A EP17190030 A EP 17190030A EP 3312536 B1 EP3312536 B1 EP 3312536B1
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EP
European Patent Office
Prior art keywords
roller
spacer
conveyor furnace
rings
roller conveyor
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EP17190030.1A
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German (de)
French (fr)
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EP3312536A1 (en
Inventor
Jan Marcel Hausherr
Liviu Toma
Jens Schmidt
Friedrich Raether
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • 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
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • 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
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • F27D3/028—Roller rails or succession of small sized rollers

Definitions

  • a roller furnace for the thermal treatment of a firing material which has at least two spacer rings and at least three spacer sleeves, which are wider in extent, on at least one roller, the spacer rings and the spacer sleeves making contact with one another.
  • the spacer rings and spacer sleeves are arranged on the at least one roller without a material connection to the at least one roller and are fixed to one another and to the roller via at least one clamping flange. Spacer rings and spacer sleeves on the roll protect them from wear and are quick and easy to replace.
  • the roller oven can be operated significantly more economically compared to roller ovens from the prior art.
  • the use of the roller furnace according to the invention for the thermal treatment of a firing material is proposed and a method for the economical treatment of a firing material with heat is presented.
  • the firing material to be treated is usually placed on temperature-resistant, reusable ceramic support frames and sequentially guided through the heating room.
  • the transport takes place via rollers that lie one behind the other in the furnace chamber and ensure the further transport of the firing material.
  • a serious material problem with this structure is the contact between the roll and the support frame, which contains the firing material. Transport over the rollers creates friction between the carrier frame and the roller, which leads to wear of the roller and carrier frame. This wear means that the rollers used have to be replaced after a few months. Since the rollers themselves and their assembly are cost-intensive, this leads to high operating costs of the roller ovens.
  • the DE 40 41 217 A1 discloses a continuous furnace and a method for the maintenance of a continuous furnace, wherein the maintenance effort is or is reduced by the fact that each support / thermal insulation arrangement forms a tensile and pressure-resistant structural unit and this structural unit can be removed from the core tube in the axial direction and onto it Core tube can be pushed on.
  • the EP 1197 721 A1 discloses a coolable furnace roller, in particular for a roller hearth furnace, which has at least one clamping ring made of metal or a metal alloy in order to produce an optimal metallic contact for heat transfer between the supporting ring and shaft which is as unimpeded as possible.
  • the US 2007/232471 A1 discloses a metallic roller around which heat-resistant rings and disks are attached without welding and which is distinguished by excellent deformability in accordance with thermal expansion and shrinkage.
  • the roller furnace according to the invention has the advantage that the presence of spacer rings and spacer sleeves prevents direct contact from the firing material or the frame with the firing material, and thus significantly reduces the frictional wear of the roller. This results in a significantly longer service life of the roll, which lowers the operating costs of the roll oven and thus makes its operation more economical.
  • the spacer rings and spacer sleeves have no integral connection to the roller and are therefore, e.g. after they have worn out, they can be replaced quickly and easily (simply remove and slide on new rings and sleeves). As a result, the economic operation of the roller kiln is further increased.
  • the spacer sleeves also ensure that the position of the spacer rings (and optionally including guide rings) remains constant during operation of the roller furnace, which means that the (support frame with) the fired material can be guided through the roller furnace in a targeted manner.
  • the surface of the spacer rollers and / or the spacer sleeves can have a coating (for example made of a hard material such as a metal carbide, ceramics). This can further increase the mechanical or chemical wear and also the temperature resistance of the spacer rollers or spacer sleeves.
  • a coating for example made of a hard material such as a metal carbide, ceramics. This can further increase the mechanical or chemical wear and also the temperature resistance of the spacer rollers or spacer sleeves.
  • the rollers, the spacer rings and / or the spacer sleeves, in particular the spacer rollers, can contain reinforcing fibers, the reinforcing fibers preferably being selected from the group consisting of glass fibers, carbon fibers, carbon nanotubes, silicon carbide fibers, basalt fibers, Al 2 O 3 fibers, steel fibers and combinations thereof .
  • the spacer rings and / or the spacer sleeves can have an inner diameter which is 0.01 to 2 mm, preferably 0.05 to 1.5 mm, particularly preferably 0.1 to 1.0 mm, in particular 0.2 to 0.5 mm , is larger than the diameter of the roll.
  • the boiler room can contain at least one supply for gas, preferably at least one supply for a gas selected from the group consisting of water vapor, N 2 , CO, H 2 and mixtures thereof.
  • the heat source can be used to generate a temperature of 400 to 1600 ° C in the boiler room.
  • the roller furnace also contains at least two guide rings, preferably at least three guide rings, which are arranged on the at least one roller without a material connection to the at least one roller and on the spacer rings and spacer sleeves and on the at least one roller via the at least one clamping flange and the at least one counterpart are fixed, the guide rings having a greater length dimension perpendicular to the axis of rotation of the roller than the at least two spacer rings.
  • the guide rings are optional at least in some areas, e.g. on one side of the guide ring or on both sides of the guide ring, beveled and / or rounded.
  • Individual spacer rings can be replaced when the wall thickness has decreased by 0.1 to 2 mm.
  • the treatment of combustion goods in the boiler room of the roller furnace can take place at a temperature of 400 to 1600 ° C.
  • roller furnace according to the invention for the thermal treatment of a firing material, preferably for the thermal treatment of a firing material at temperatures of 400 to 1600 ° C., is proposed.
  • FIG 1 schematically shows a cross section through a specific embodiment of a roller furnace 1 according to the invention.
  • the spacer rings 2 ensure that the carrier frame 3 does not have any contact with the roller 4 with items to be burned.
  • the spacer sleeves 5 define the position of the spacer rings 2 along the roller 4 and provide additional protection for the roller 4.
  • the roller 4 also contains three guide rings 6.
  • the two outer guide rings 6 are here on one side in some areas (here for Inside the roller furnace facing side) and the central guide ring 6 is bevelled on both sides in some areas.
  • the spacer rings 2 and spacer sleeves 5 are fixed to one another and to the roller 4 via two clamping flanges 7 (here two screwable clamps).

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

Description

Es wird ein Rollenofen zur thermischen Behandlung eines Brennguts bereitgestellt, der auf mindestens einer Rolle mindestens zwei Abstandsringe und mindestens drei, in der Ausdehnung breitere, Abstandshülsen aufweist, wobei sich die Abstandsringe und die Abstandshülsen gegenseitig kontaktieren. Die Abstandsringe und Abstandshülsen sind auf der mindestens einen Rolle ohne stoffschlüssige Verbindung zur mindestens einen Rolle angeordnet und sind über mindestens einen Klemmflansch untereinander und mit der Rolle fixiert. Abstandsringe und Abstandshülsen auf der Rolle schützen diese vor Verschleiß und sind einfache und schnell austauschbar. Der Rollenofen lässt sich verglichen mit Rollenöfen aus dem Stand der Technik deutlich ökonomischer betreiben. Es wird die Verwendung des erfindungsgemäßen Rollenofens zur thermischen Behandlung eines Brennguts vorgeschlagen und ein Verfahren zur ökonomischen Behandlung eines Brennguts mit Wärme vorgestellt.A roller furnace for the thermal treatment of a firing material is provided which has at least two spacer rings and at least three spacer sleeves, which are wider in extent, on at least one roller, the spacer rings and the spacer sleeves making contact with one another. The spacer rings and spacer sleeves are arranged on the at least one roller without a material connection to the at least one roller and are fixed to one another and to the roller via at least one clamping flange. Spacer rings and spacer sleeves on the roll protect them from wear and are quick and easy to replace. The roller oven can be operated significantly more economically compared to roller ovens from the prior art. The use of the roller furnace according to the invention for the thermal treatment of a firing material is proposed and a method for the economical treatment of a firing material with heat is presented.

Bei Rollenöfen wird das zu behandelnde Brenngut üblicherweise auf temperaturbeständigen, mehrfach verwendbaren keramischen Trägergestellen platziert und sequentiell durch den Heizraum geführt. Der Transport erfolgt dabei über Rollen, die hintereinander im Ofenraum liegen und den Weitertransport des Brennguts gewährleisten. Ein gravierendes Werkstoffproblem bei diesem Aufbau ist der Kontakt zwischen Rolle und Trägergestell, welches das Brenngut enthält. Der Transport über die Rollen erzeugt Reibung zwischen dem Trägergestell und der Rolle, was zu Verschleiß von Rolle und Trägergestell führt. Dieser Verschleiß führt dazu, dass die eingesetzten Rollen nach wenigen Monaten ausgewechselt werden müssen. Da die Rollen ans sich und deren Montage kostenintensiv ist führt dies zu hohen Betriebskosten der Rollenöfen.In the case of roller ovens, the firing material to be treated is usually placed on temperature-resistant, reusable ceramic support frames and sequentially guided through the heating room. The transport takes place via rollers that lie one behind the other in the furnace chamber and ensure the further transport of the firing material. A serious material problem with this structure is the contact between the roll and the support frame, which contains the firing material. Transport over the rollers creates friction between the carrier frame and the roller, which leads to wear of the roller and carrier frame. This wear means that the rollers used have to be replaced after a few months. Since the rollers themselves and their assembly are cost-intensive, this leads to high operating costs of the roller ovens.

Die DE 40 41 217 A1 offenbart einen Durchlaufofen und ein Verfahren zur Wartung eines Durchlaufofens, wobei der Aufwand bei der Wartung dadurch vermindert ist bzw. wird, dass jede Trag/Wärmedämm-Anordnung eine zug- und druckfeste Baueinheit bildet und diese Baueinheit vom Kernrohr in axialer Richtung abziehbar und auf das Kernrohr aufschiebbar ist. Die EP 1197 721 A1 offenbart eine kühlbare Ofenrolle, insbesondere für einen Rollenherdofen, die zur Herstellung eines optimalen metallischen Kontakts für einen möglichst ungehinderten Wärmeübergang zwischen Tragring und Welle mindestens einen Klemmring aus Metall oder aus einer Metalllegierung aufweist. Die US 2007/232471 A1 offenbart eine metallische Rolle, um die herum ohne Verschweißen hitzebeständige Ringe und Scheiben angebracht sind und die sich durch eine ausgezeichnete Verformbarkeit in Übereinstimmung mit thermischer Ausdehnung und Schrumpfung auszeichnet.The DE 40 41 217 A1 discloses a continuous furnace and a method for the maintenance of a continuous furnace, wherein the maintenance effort is or is reduced by the fact that each support / thermal insulation arrangement forms a tensile and pressure-resistant structural unit and this structural unit can be removed from the core tube in the axial direction and onto it Core tube can be pushed on. The EP 1197 721 A1 discloses a coolable furnace roller, in particular for a roller hearth furnace, which has at least one clamping ring made of metal or a metal alloy in order to produce an optimal metallic contact for heat transfer between the supporting ring and shaft which is as unimpeded as possible. The US 2007/232471 A1 discloses a metallic roller around which heat-resistant rings and disks are attached without welding and which is distinguished by excellent deformability in accordance with thermal expansion and shrinkage.

Ausgehend hiervon war es die Aufgabe der vorliegenden Erfindung, einen Rollenofen bereitzustellen, der sich mit niedrigeren Betriebskosten, d.h. ökonomischer, betreiben lässt.Proceeding from this, it was the object of the present invention to provide a roller furnace which can be operated with lower operating costs, i.e. more economical, can be operated.

Die Aufgabe wird gelöst durch den Rollenofen gemäß Anspruch 1, das Verfahren gemäß Anspruch 12 und die Verwendung gemäß Anspruch 15. Die abhängigen Ansprüche zeigen vorteilhafte Weiterbildungen auf. Erfindungsgemäß wird ein Rollenofen zur thermischen Behandlung eines Brennguts bereitgestellt, enthaltend

  1. a) einen Heizraum, der eine mindestens eine Wärmequelle enthält;
  2. b) mindestens eine Rolle zum Transport eines Brennguts durch den Heizraum, wobei die Rolle einen Mittelbereich aufweist, der sich innerhalb des Heizraums befindet und einen ersten und einen zweiten Endbereich aufweist, wobei sich der erste und zweite Endbereich außerhalb des Heizraums an sich gegenüberliegenden Stellen des Heizraums befindet;
  3. c) mindestens zwei Abstandsringe, die auf der mindestens einen Rolle angeordnet sind;
  4. d) mindestens drei Abstandshülsen, die auf der mindestens einen Rolle angeordnet sind, wobei die mindestens drei Abstandshülsen eine größere Längenausdehnung entlang der Drehachse der Rolle und eine kleinere Längenausdehnung senkrecht zur Drehachse der Rolle aufweisen als die mindestens zwei Abstandsringe und wobei die mindestens drei Abstandshülsen jeweils mindestens einen Abstandsring kontaktieren;
  5. e) mindestens einen Klemmflansch und mindestens ein Gegenstück, wobei der mindestens eine Klemmflansch in dem ersten Endbereich der mindestens einen Rolle angeordnet ist und mindestens eine der Abstandshülsen kontaktiert und das mindestens eine Gegenstück in dem zweiten Endbereich der Rolle angeordnet ist und mindestens eine der Abstandshülsen kontaktiert;
dadurch gekennzeichnet, dass die Abstandsringe und Abstandshülsen auf der mindestens einen Rolle ohne stoffschlüssige Verbindung zur mindestens einen Rolle angeordnet sind und der mindestens eine Klemmflansch die mindestens zwei Abstandsringe und mindestens drei Abstandshülsen untereinander und mit der Rolle über eine Klemmverbindung fixiert.The object is achieved by the roller furnace according to claim 1, the method according to claim 12 and the use according to claim 15. The dependent claims show advantageous developments. According to the invention, a roller furnace for the thermal treatment of a firing material is provided, comprising
  1. a) a boiler room containing at least one heat source;
  2. b) at least one roller for transporting a combustible material through the boiler room, the roller having a central region which is located within the boiler room and has a first and a second end region, the first and second end regions being located at opposite locations of the boiler room Boiler room is located;
  3. c) at least two spacer rings which are arranged on the at least one roller;
  4. d) at least three spacer sleeves, which are arranged on the at least one roller, the at least three spacer sleeves having a greater length dimension along the axis of rotation of the roller and a smaller length dimension perpendicular to the axis of rotation of the roller than that at least two spacer rings and wherein the at least three spacer sleeves each contact at least one spacer ring;
  5. e) at least one clamping flange and at least one counterpart, the at least one clamping flange being arranged in the first end region of the at least one roller and contacting at least one of the spacer sleeves and the at least one counterpart being arranged in the second end region of the roller and contacting at least one of the spacer sleeves ;
characterized in that the spacer rings and spacer sleeves are arranged on the at least one roller without a material connection to the at least one roller and the at least one clamping flange fixes the at least two spacer rings and at least three spacer sleeves to one another and to the roller via a clamp connection.

Der erfindungsgemäße Rollenofen weist den Vorteil auf, dass durch die Gegenwart von Abstandsringen und Abstandshülsen ein direkter Kontakt von dem Brenngut, bzw. dem Gestell mit Brenngut, zur Rolle verhindert wird und somit der Reibungsverschleiß der Rolle signifikant reduziert ist. Es ergibt sich dadurch eine erheblich höhere Lebensdauer der Rolle, was die Betriebskosten des Rollenofens senkt und somit seinen Betrieb ökonomischer macht. Darüberhinaus weisen die Abstandsringe und Abstandshülsen keine stoffschlüssige Verbindung zur Rolle auf und sind somit, z.B. nach deren Verschleißens, auf einfache und schnelle Art und Weise austauschbar (einfaches Entfernen und Aufschieben neuer Ringe und Hülsen). Als Folge hiervon wird der ökonomische Betrieb des Rollenofens weiter gesteigert. Die Abstandshülsen gewährleisten zudem, dass die Position der Abstandsringe (und optional enthaltender Führungsringe) während dem Betrieb des Rollenofens konstant bleibt, wodurch das (Trägergestell mit) Brenngut gezielt durch den Rollenofen geführt werden kann.The roller furnace according to the invention has the advantage that the presence of spacer rings and spacer sleeves prevents direct contact from the firing material or the frame with the firing material, and thus significantly reduces the frictional wear of the roller. This results in a significantly longer service life of the roll, which lowers the operating costs of the roll oven and thus makes its operation more economical. In addition, the spacer rings and spacer sleeves have no integral connection to the roller and are therefore, e.g. after they have worn out, they can be replaced quickly and easily (simply remove and slide on new rings and sleeves). As a result, the economic operation of the roller kiln is further increased. The spacer sleeves also ensure that the position of the spacer rings (and optionally including guide rings) remains constant during operation of the roller furnace, which means that the (support frame with) the fired material can be guided through the roller furnace in a targeted manner.

Die Oberfläche der Abstandsrollen und/oder der Abstandshülsen kann eine Beschichtung (z.B. aus einem Hartstoff, wie z.B. einem Metall-Karbid, Keramiken) aufweisen. Dies kann den mechanischen bzw. chemischen Verschleiß und auch die Temperaturbeständigkeit der Abstandsrollen bzw. Abstandshülsen weiter steigern.The surface of the spacer rollers and / or the spacer sleeves can have a coating (for example made of a hard material such as a metal carbide, ceramics). This can further increase the mechanical or chemical wear and also the temperature resistance of the spacer rollers or spacer sleeves.

Der erfindungsgemäße Rollenofen kann dadurch gekennzeichnet, dass er

  1. i) mindestens zwei, bevorzugt mindestens vier, besonders bevorzugt mindestens acht, insbesondere mindestens zwanzig, Rollen; und/oder
  2. ii) mindestens drei, bevorzugt mindestens vier, besonders bevorzugt mindestens fünf, insbesondere mindestens sechs, Abstandsringe auf der mindestens einen Rolle, optional auf allen Rollen; und/oder
  3. iii) mindestens vier, bevorzugt mindestens fünf, besonders bevorzugt mindestens sechs, insbesondere mindestens sieben, Abstandshülsen auf der mindestens einen Rolle, optional auf allen Rollen;
aufweist.The roller furnace according to the invention can be characterized in that it
  1. i) at least two, preferably at least four, particularly preferably at least eight, in particular at least twenty, roles; and or
  2. ii) at least three, preferably at least four, particularly preferably at least five, in particular at least six, spacer rings on the at least one roller, optionally on all rollers; and or
  3. iii) at least four, preferably at least five, particularly preferably at least six, in particular at least seven, spacer sleeves on the at least one roller, optionally on all rollers;
having.

Hierbei kann das mindestens eine Gegenstück

  1. i) einen Klemmflansch enthalten oder daraus bestehen; und/oder
  2. ii) einen stoffschlüssig mit der Rolle verbundenen Ring oder eine stoffschlüssig mit der Rolle verbundene Hülse enthalten oder daraus bestehen, wobei die stoffschlüssige Verbindung bevorzugt ausgewählt ist aus der Gruppe bestehend aus Klebeverbindung, Schweißverbindung und Mischungen hiervon; und/oder
  3. iii) eine Ausbuchtung der Rolle darstellen, die monolithisch zur Rolle ist.
This can be at least one counterpart
  1. i) contain or consist of a clamping flange; and or
  2. ii) contain or consist of a ring which is integrally connected to the roller or a sleeve which is integrally connected to the roller, the integral connection preferably being selected from the group consisting of adhesive connection, welded connection and mixtures thereof; and or
  3. iii) represent a bulge of the roll that is monolithic to the roll.

Die Rollen, die Abstandsringe und/oder die Abstandshülsen können

  1. i) ein Metall, bevorzugt Stahl, besonders bevorzugt Edelstahl; und/oder
  2. ii) ein oxidisches Material, bevorzugt ein oxidisches Material ausgewählt aus der Gruppe bestehend aus Al2O3, SiO2, ZrO und Mischungen hiervon; und/oder
  3. iii) einen Hartstoff, bevorzugt einen Hartstoff ausgewählt aus der Gruppe bestehend aus Si3N4, SiC und Mischungen hiervon, besonders bevorzugt ausgewählt aus der Gruppe bestehend aus SiSiC, RSiC und Mischungen hiervon;
enthalten oder daraus bestehen, wobei bevorzugt Abstandshülsen, die zumindest bereichsweise im ersten oder zweiten Endbereich außerhalb des Heizraums angeordnet sind ein Metall, bevorzugt Stahl, besonders bevorzugt Edelstahl, enthalten oder daraus bestehen (z.B. in Form eines gewalzten Blechs). Abstandshülsen aus diesen kostengünstigen Materialien haben hat den Vorteil, dass in dem Endbereich außerhalb des Heizraums ("Kaltbereich") die Anschaffungskosten für die Abstandshülsen geringer sind und damit der Betrieb des Rollenofens (noch) ökonomischer wird ohne dadurch einen Nachteil zu erleiden, da die Anforderung an die Hitzetoleranzen im Kaltbereich geringer sind.The rollers, the spacer rings and / or the spacer sleeves can
  1. i) a metal, preferably steel, particularly preferably stainless steel; and or
  2. ii) an oxidic material, preferably an oxidic material selected from the group consisting of Al 2 O 3 , SiO 2 , ZrO and mixtures thereof; and or
  3. iii) a hard material, preferably a hard material selected from the group consisting of Si 3 N 4 , SiC and mixtures thereof, particularly preferably selected from the group consisting of SiSiC, RSiC and mixtures thereof;
contain or consist thereof, preferably spacer sleeves, which are arranged at least in regions in the first or second end region outside the boiler room, contain or consist of a metal, preferably steel, particularly preferably stainless steel (for example in the form of a rolled sheet). Spacers made from these inexpensive materials have the advantage that the purchase costs for the spacers are lower in the end area outside the boiler room (“cold area”) and thus the Operation of the roller kiln becomes (even) more economical without suffering a disadvantage because the requirements for the heat tolerances in the cold area are lower.

Die Rollen, die Abstandsringe und/oder die Abstandshülsen, insbesondere die Abstandsrollen, können Verstärkungsfasern enthalten, wobei die Verstärkungsfasern bevorzugt ausgewählt sind aus der Gruppe bestehend aus Glasfasern, Kohlenstofffasern, Kohlenstoffnanoröhrchen, Siliziumkarbidfasern Basaltfasern, Al2O3-Fasern, Stahlfasern und Kombinationen hiervon.The rollers, the spacer rings and / or the spacer sleeves, in particular the spacer rollers, can contain reinforcing fibers, the reinforcing fibers preferably being selected from the group consisting of glass fibers, carbon fibers, carbon nanotubes, silicon carbide fibers, basalt fibers, Al 2 O 3 fibers, steel fibers and combinations thereof .

Die Abstandsringe und/oder die Abstandshülsen können einen Innendurchmesser aufweisen, der 0,01 bis 2 mm, bevorzugt 0,05 bis 1,5 mm, besonders bevorzugt 0,1 bis 1,0 mm, insbesondere 0,2 bis 0,5 mm, größer ist als der Durchmesser der Rolle.The spacer rings and / or the spacer sleeves can have an inner diameter which is 0.01 to 2 mm, preferably 0.05 to 1.5 mm, particularly preferably 0.1 to 1.0 mm, in particular 0.2 to 0.5 mm , is larger than the diameter of the roll.

Eine Wanddicke

  1. i) der Abstandsringe kann 1 bis 20 mm, bevorzugt 2 bis 16 mm, besonders bevorzugt 3 bis 12 mm, insbesondere 5 bis 10 mm, betragen; und/oder
  2. ii) der Abstandshülsen kann 0,1 mm bis < 1mm, 0,2 mm bis 0,9 mm, besonders bevorzugt 0,3 mm bis 0,8 mm, insbesondere 0,4 mm bis 0,6 mm, betragen.
Da die Abstandshülsen eine kleinere Längenausdehnung senkrecht zur Drehachse der Rolle aufweisen als die Abstandsringe weisen diese im Betrieb des Rollenofens keinen Kontakt zum (Trägergestell mit) Brenngut auf und können somit auch dünnwandig ausgestaltet sein. Eine dünne Wanddicke der Abstandshülsen ist somit in dem erfindungsgemäßen Rollenofen nicht nachteilig und vielmehr mit dem Vorteil verbunden, dass die Produktions- und Anschaffungskosten der Abstandshülsen geringer sind und dadurch der Rollenofen (noch) ökonomischer betrieben werden kann.A wall thickness
  1. i) the spacer rings can be 1 to 20 mm, preferably 2 to 16 mm, particularly preferably 3 to 12 mm, in particular 5 to 10 mm; and or
  2. ii) the spacer sleeves can be 0.1 mm to <1 mm, 0.2 mm to 0.9 mm, particularly preferably 0.3 mm to 0.8 mm, in particular 0.4 mm to 0.6 mm.
Since the spacer sleeves have a smaller length dimension perpendicular to the axis of rotation of the roller than the spacer rings, these have no contact with the (support frame with) firing material during operation of the roller furnace and can therefore also be of thin-walled design. A thin wall thickness of the spacer sleeves is thus not disadvantageous in the roller furnace according to the invention and rather is associated with the advantage that the production and purchase costs of the spacer sleeves are lower and the roller furnace can (still) be operated more economically.

Der Heizraum kann mindestens eine Zufuhr für Gas enthalten, bevorzugt mindestens eine Zufuhr für ein Gas ausgewählt aus der Gruppe bestehend aus Wasserdampf, N2, CO, H2 und Mischungen hiervon.The boiler room can contain at least one supply for gas, preferably at least one supply for a gas selected from the group consisting of water vapor, N 2 , CO, H 2 and mixtures thereof.

Die Wärmequelle kann dazu geeignet ist, eine Temperatur von 400 bis 1600 °C in dem Heizraum zu erzeugen.The heat source can be used to generate a temperature of 400 to 1600 ° C in the boiler room.

In einer bevorzugten Ausgestaltungsform enthält der Rollenofen ferner mindestens zwei Führungsringe, bevorzugt mindestens drei Führungsringe, die auf der mindestens einen Rolle ohne stoffschlüssige Verbindung zur mindestens einen Rolle angeordnet sind und an den Abstandsringen und Abstandshülsen und an der mindestens einen Rolle über den mindestens einen Klemmflansch und das mindestens eine Gegenstück fixiert sind, wobei die Führungsringe eine größere Längenausdehnung senkrecht zur Drehachse der Rolle aufweisen als die mindestens zwei Abstandsringe. Optional sind die Führungsringe zumindest bereichsweise, z.B. an einer Seite des Führungsrings oder an beiden Seiten des Führungsrings, angeschrägt und/oder abgerundet. Diese Führungsringe unterbinden ein seitliches "Abwandern" des Brennguts bzw. des Gestells mit Brenngut und verhindern somit eine Beschädigung der (Wärmeisolierung der) Seitenwände des Rollenofens. Dadurch erhöht sich zum Einen die Lebensdauer des Rollenofens und es wird sichergestellt, dass die seitliche Wärmeisolierung des Rollenofens über seine gesamte Lebensdauer aufrecht erhalten bleibt. Beide Faktoren machen den Betrieb des Rollenofens ökonomischer.In a preferred embodiment, the roller furnace also contains at least two guide rings, preferably at least three guide rings, which are arranged on the at least one roller without a material connection to the at least one roller and on the spacer rings and spacer sleeves and on the at least one roller via the at least one clamping flange and the at least one counterpart are fixed, the guide rings having a greater length dimension perpendicular to the axis of rotation of the roller than the at least two spacer rings. The guide rings are optional at least in some areas, e.g. on one side of the guide ring or on both sides of the guide ring, beveled and / or rounded. These guide rings prevent lateral "migration" of the firing goods or the frame with firing goods and thus prevent damage to the (heat insulation of) the side walls of the roller furnace. On the one hand, this increases the lifespan of the roller oven and it is ensured that the lateral heat insulation of the roller oven is maintained over its entire lifespan. Both factors make the operation of the roller oven more economical.

Der Rollenofen kann mindestens ein Gestell zum Transport von einem Brenngut aufweisen, wobei das Gestell bevorzugt

  1. i) ein Metall, bevorzugt Stahl, besonders bevorzugt Edelstahl; und/oder
  2. ii) ein oxidisches Material, bevorzugt ein oxidisches Material ausgewählt aus der Gruppe bestehend aus Al2O3, SiO2, ZrO und Mischungen hiervon; und/oder
  3. iii) einen Hartstoff, bevorzugt einen Hartstoff ausgewählt aus der Gruppe bestehend aus Si3N4, SiC und Mischungen hiervon, besonders bevorzugt ausgewählt aus der Gruppe bestehend aus SiSiC, RSiC und Mischungen hiervon;
enthält oder daraus besteht.The roller furnace can have at least one frame for transporting a firing material, the frame being preferred
  1. i) a metal, preferably steel, particularly preferably stainless steel; and or
  2. ii) an oxidic material, preferably an oxidic material selected from the group consisting of Al 2 O 3 , SiO 2 , ZrO and mixtures thereof; and or
  3. iii) a hard material, preferably a hard material selected from the group consisting of Si 3 N 4 , SiC and mixtures thereof, particularly preferably selected from the group consisting of SiSiC, RSiC and mixtures thereof;
contains or consists of.

Ferner wird ein Verfahren zur ökonomischen Behandlung eines Brennguts mit Wärme bereitgestellt, umfassend die Schritte

  1. a) Behandlung von Brenngütern in dem Heizraum eines Rollenofens gemäß einem der vorhergehenden Ansprüche;
  2. b) Messung einer Wandstärke der Abstandsringe und/oder der Abstandshül sen; und
  3. c) Austausch von einzelnen Abstandsringen und/oder einzelnen Abstandshülsen, wenn die Wandstärke einen kritischen Wert unterschritten hat, wobei der Austausch das Lösen und Wiederherstellen der Klemmverbindung des mindestens einen Klemmflansches umfasst.
Furthermore, a method for the economical treatment of a fuel with heat is provided, comprising the steps
  1. a) treatment of fuel in the boiler room of a roller furnace according to one of the preceding claims;
  2. b) measurement of a wall thickness of the spacer rings and / or the spacer sleeve sen; and
  3. c) Exchange of individual spacer rings and / or individual spacer sleeves if the wall thickness has fallen below a critical value, the exchange comprising loosening and restoring the clamp connection of the at least one clamp flange.

Der Austausch einzelner Abstandsringe kann erfolgen, wenn sich die Wandstärke um 0,1 bis 2 mm reduziert hat.Individual spacer rings can be replaced when the wall thickness has decreased by 0.1 to 2 mm.

Die Behandlung von Brenngütern in dem Heizraum des Rollenofens kann bei einer Temperatur von 400 bis 1600 °C erfolgen.The treatment of combustion goods in the boiler room of the roller furnace can take place at a temperature of 400 to 1600 ° C.

Darüberhinaus wird die Verwendung des erfindungsgemäßen Rollenofens zur thermischen Behandlung eines Brennguts, bevorzugt zur thermischen Behandlung eines Brennguts bei Temperaturen von 400 bis 1600 °C, vorgeschlagen.In addition, the use of the roller furnace according to the invention for the thermal treatment of a firing material, preferably for the thermal treatment of a firing material at temperatures of 400 to 1600 ° C., is proposed.

Anhand der nachfolgenden Figur und des nachfolgenden Beispiels soll der erfindungsgemäße Gegenstand näher erläutert werden, ohne diesen auf die hier dargestellten spezifischen Ausgestaltungsformen einschränken zu wollen.The subject according to the invention is intended to be explained in more detail with reference to the following figure and the following example, without wishing to restrict it to the specific embodiments shown here.

Figur 1 zeigt schematisch einen Querschnitt durch eine spezifische Ausgestaltungsform eines erfindungsgemäßen Rollenofens 1. Die Abstandringe 2 sorgen dafür, dass das Trägergestell 3 mit Brenngut keinen Kontakt zur Rolle 4 hat. Die Abstandhülsen 5 definieren die Position der Abstandsringe 2 entlang der Rolle 4 und stellen einen zusätzlichen Schutz der Rolle 4 dar. In dieser Ausgestaltungsform enthält die Rolle 4 zudem drei Führungsringe 6. Die zwei äußeren Führungsringe 6 sind hier bereichsweise an einer Seite (hier die zum Inneren des Rollenofens gewandte Seite) angeschrägt und der mittlere Führungsring 6 ist hier bereichsweise beidseitig angeschrägt. Die Abstandsringe 2 und Abstandshülsen 5 sind über zwei Klemmflansche 7 (hier zwei verschraubbare Schellen) untereinander und zur Rolle 4 fixiert. Figure 1 schematically shows a cross section through a specific embodiment of a roller furnace 1 according to the invention. The spacer rings 2 ensure that the carrier frame 3 does not have any contact with the roller 4 with items to be burned. The spacer sleeves 5 define the position of the spacer rings 2 along the roller 4 and provide additional protection for the roller 4. In this embodiment, the roller 4 also contains three guide rings 6. The two outer guide rings 6 are here on one side in some areas (here for Inside the roller furnace facing side) and the central guide ring 6 is bevelled on both sides in some areas. The spacer rings 2 and spacer sleeves 5 are fixed to one another and to the roller 4 via two clamping flanges 7 (here two screwable clamps).

Beispiel - Mögliche Materialien für die Rolle, die Abstandsringe und die Abstandshülsen Example - Possible materials for the roller, the spacer rings and the spacer sleeves

Die Rolle, die Abstandsringe und/oder die Abstandshülsen können die folgenden Materialien enthalten oder daraus bestehen

  • hochveredelte Stähle (bis 900°C im Rollenofen);
  • gegossene Hartlegierungen (Co, Ni) (bis ca. 1000 °C im Rollenofen);
  • Hartmetalle (CerMet, TiC, WC, TaC) (bis ca . 1000°C im Rollenofen);
  • Al2O3 (bis ca . 1200°C im Rollenofen);
  • ZrO (bis ca . 1200°C im Rollenofen);
  • Si3N4 (bis ca . 1200°C im Rollenofen)
  • SiSiC (bis über 1200°C im Rollenofen);
  • RSiC (bis über 1200°C im Rollenofen);
  • LPI-SiC (bis über 1200°C im Rollenofen).
The roller, the spacer rings and / or the spacer sleeves can contain or consist of the following materials
  • highly refined steels (up to 900 ° C in a roller furnace);
  • cast hard alloys (Co, Ni) (up to approx. 1000 ° C in a roller furnace);
  • Hard metals (CerMet, TiC, WC, TaC) (up to approx. 1000 ° C in a roller furnace);
  • Al 2 O 3 (up to approx. 1200 ° C in a roller furnace);
  • ZrO (up to approx. 1200 ° C in a roller oven);
  • Si 3 N 4 (up to approx. 1200 ° C in a roller oven)
  • SiSiC (up to over 1200 ° C in a roller oven);
  • RSiC (up to over 1200 ° C in a roller oven);
  • LPI-SiC (up to over 1200 ° C in a roller oven).

Claims (15)

  1. A roller conveyor furnace (1) for the thermal treatment of an object to be fired, comprising
    a) a heating chamber which comprises at least one heat source;
    b) at least one roller (4) for transporting an object to be fired through the heating chamber, wherein the roller (4) has a middle region which is located within the heating chamber and has a first and a second end region, wherein the first and second end regions are located outside the heating chamber at points of the heating chamber which lie opposite one another;
    c) at least two spacer rings (2), which are arranged on the at least one roller (4);
    d) at least three spacer sleeves (5), which are arranged on the at least one roller (4), wherein the at least three spacer sleeves (5) have a greater linear extent along the axis of rotation of the roller (4) and a smaller linear extent perpendicularly to the axis of rotation of the roller (4) than the at least two spacer rings (2), and wherein the at least three spacer sleeves (5) in each case contact at least one spacer ring (2);
    e) at least one clamping flange (7) and at least one counter-piece (7), wherein the at least one clamping flange (7) is arranged in the first end region of the at least one roller (4) and contacts at least one of the spacer sleeves (5), and the at least one counter-piece (7) is arranged in the second end region of the roller (4) and contacts at least one of the spacer sleeves (5);
    characterised in that the spacer rings (2) and spacer sleeves (5) are arranged on the at least one roller (4) without a connection by a material bond with the at least one roller (4), and the at least one clamping flange (7) fixes the at least two spacer rings (2) and at least three spacer sleeves (5) to each other and to the roller (4) by way of a clamping connection.
  2. A roller conveyor furnace (1) according to Claim 1, characterised in that the roller conveyor furnace has
    i) at least two rollers (4); and/or
    ii) at least three spacer rings (2) on the at least one roller (4); and/or
    i) at least four spacer sleeves (5) on the at least one roller (4).
  3. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the at least one counter-piece (7)
    i) comprises or consists of a clamping flange (7); and/or
    ii) comprises or consists of a ring connected by a material bond to the roller (4), or a sleeve connected by a material bond to the roller (4); and/or
    iii) represents a protrusion of the roller (4) which is monolithic with the roller (4).
  4. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the rollers (4), the spacer rings (2) and/or the spacer sleeves (5) comprises or consists of
    i) a metal; and/or
    ii) an oxidic material; and/or
    iii) a hard material.
  5. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the rollers (4), the spacer rings (2) and/or the spacer sleeves (5) comprise reinforcing fibres.
  6. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the spacer rings (2) and/or the spacer sleeves (5) have an internal diameter which is 0.01 to 2 mm greater than the diameter of the roller (4).
  7. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that a wall thickness
    i) of the spacer rings (2) is 1 to 20 mm; and/or
    ii) of the spacer sleeves (5) is 0.1 mm to < 1mm.
  8. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the heating chamber comprises at least one feed for gas.
  9. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the heat source is suitable for producing a temperature of 400 to 1600 °C in the heating chamber.
  10. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the roller conveyor furnace (1) further contains at least two guide rings (6), which are arranged on the at least one roller (4) without a connection by a material bond with the at least one roller (4) and are fixed to the spacer rings (2) and spacer sleeves (5) and to the at least one roller (4) by way of the at least one clamping flange (7) and the at least one counter-piece (7), the guide rings (6) having a greater linear extent perpendicularly to the axis of rotation of the roller (4) than the at least two spacer rings (2).
  11. A roller conveyor furnace (1) according to one of the preceding claims, characterised in that the roller conveyor furnace (1) has at least one frame (3) for transporting an object to be fired, wherein the frame (3) comprises or consists of
    i) a metal; and/or
    ii) an oxidic material; and/or
    iii) a hard material.
  12. A method for economically treating an object to be fired with heat, comprising the steps
    a) treating objects to be fired in the heating chamber of a roller conveyor furnace according to one of the preceding claims;
    b) measuring a wall thickness of the spacer rings (2) and/or the spacer sleeves (5); and
    c) replacing individual spacer rings (2) and/or individual spacer sleeves (5) if the wall thickness has dropped below a critical value, the replacement comprising the releasing and restoring of the clamping connection of the at least one clamping flange (7).
  13. A method according to Claim 12, characterised in that the replacement of individual spacer rings (2) takes place if the wall thickness has been reduced by 0.1 to 2 mm.
  14. A method according to one of Claims 12 or 13, characterised in that the treatment of objects to be fired in the heating chamber of the roller conveyor furnace (1) takes place at a temperature of 400 to 1600°C.
  15. Use of the roller conveyor furnace (1) according to one of Claims 1 to 11 for the thermal treatment of an object to be fired.
EP17190030.1A 2016-10-14 2017-09-08 Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired Active EP3312536B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016220099.2A DE102016220099A1 (en) 2016-10-14 2016-10-14 Roller kiln for the thermal treatment of a combustible, uses thereof, and method for the economical treatment of a combustible with heat

Publications (2)

Publication Number Publication Date
EP3312536A1 EP3312536A1 (en) 2018-04-25
EP3312536B1 true EP3312536B1 (en) 2020-03-25

Family

ID=59923232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17190030.1A Active EP3312536B1 (en) 2016-10-14 2017-09-08 Roller furnace for thermal treatment of an item, uses thereof and method for economical treatment of an object to be fired

Country Status (2)

Country Link
EP (1) EP3312536B1 (en)
DE (1) DE102016220099A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110081713B (en) * 2019-04-10 2020-10-09 东南大学 Roller supporting device for industrial roller kiln

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB431459A (en) * 1933-12-06 1935-07-08 Driver Harris Co Improvements relating to heat treating furnaces
GB782632A (en) * 1955-08-16 1957-09-11 Wheelabrator Corp Roller conveyor
DE4041217A1 (en) * 1989-12-23 1991-07-11 Reining Heisskuehlung Gmbh & C Driven roller for continuous heating furnace - has core tube enclosed in removable layer of thermal insulation
US5370530A (en) * 1993-03-24 1994-12-06 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
DE19653045A1 (en) * 1996-12-19 1998-06-25 Horst Groos Method for transporting ceramic firing goods through kiln
DE10047046A1 (en) * 2000-09-22 2002-04-11 Sms Demag Ag Furnace roll used for transporting continuously cast material from a continuous casting plant comprises a shaft with coolant channels arranged outside of the furnace, and supporting rings arranged on the shaft using a receiving bore
KR100578468B1 (en) * 2004-05-20 2006-05-10 대한동방 주식회사 Adiabatic Roll

Non-Patent Citations (1)

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

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DE102016220099A1 (en) 2018-04-19

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