EP2220449B1 - Tunnel furnace for the temperature treatment of goods - Google Patents

Tunnel furnace for the temperature treatment of goods Download PDF

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Publication number
EP2220449B1
EP2220449B1 EP08853545.5A EP08853545A EP2220449B1 EP 2220449 B1 EP2220449 B1 EP 2220449B1 EP 08853545 A EP08853545 A EP 08853545A EP 2220449 B1 EP2220449 B1 EP 2220449B1
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EP
European Patent Office
Prior art keywords
tunnel
tunnel furnace
goods
characterized
furnace according
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.)
Active
Application number
EP08853545.5A
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German (de)
French (fr)
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EP2220449A1 (en
Inventor
Wolfgang Hasselmann
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.)
Umicore AG and Co KG
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Umicore AG and Co KG
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Filing date
Publication date
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Priority to DE102007057237A priority Critical patent/DE102007057237A1/en
Application filed by Umicore AG and Co KG filed Critical Umicore AG and Co KG
Priority to PCT/EP2008/066092 priority patent/WO2009068505A1/en
Publication of EP2220449A1 publication Critical patent/EP2220449A1/en
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Publication of EP2220449B1 publication Critical patent/EP2220449B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40292545&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2220449(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/021Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases

Description

  • The invention relates to a tunnel kiln for the temperature treatment of goods in a continuous process within a manufacturing process.
  • Tunnel ovens or furnaces usually consist of several flanged segments. The segments form a tunnel through which the objects to be treated are transported on a suitable conveyor belt. A loading station and an unloading station are used for loading and unloading the conveyor belt. The tunnel kilns are heated either by means of burners or electric heating elements.
  • The publication DE 2 344 138 , the US patent US 2,330,984 , the Belgian patent BE 557592 and the European patent application EP 0 090 790 A1 disclose tunnel ovens in which, driven by a fan, heated air circulates transversely to the transport direction of the goods. The circulation flow is designed so that it flows through the goods located on a conveyor belt over the entire width of the conveyor belt in the same direction. The return flow of the heated air takes place via appropriate clearances on both sides of the conveyor belt within the tunnel kiln.
  • The European patent application EP 1 106 947 A1 describes a tunnel furnace for the heating of printed circuit boards. Among other things, this oven has two parallel conveyor belts for the printed circuit boards.
  • Tunnel furnaces are also used in the manufacture of automotive catalytic converters for drying and calcining ceramic green bodies or a catalyst layer applied to inert supports. Tunnel furnaces for the calcination of ceramic honeycomb bodies are described, for example, in the patents US 6,048,199 . US 6,089,860 and US Pat. No. 6,325,963 B1 described. DE 1 251 479 B discloses a method for transporting piece-form kiln through a tunnel kiln, with a number of separate tunneling units. Under the stove of the furnace in a heating chamber heating elements, or gas or oil burners or electric radiators are arranged. Each tunnel unit has its own fans, which are located under the stove hot air chamber in which the heating elements are arranged.
  • The present invention is particularly concerned with a tunnel kiln for the production of automotive exhaust catalysts. When the goods are therefore preferably freshly coated with catalyst monolithic support body as in shape be used by so-called honeycomb bodies made of ceramic or metal for the production of automotive exhaust catalysts. The catalyst layer must be dried and calcined. Of course, the tunnel kiln according to the invention can also be used for the treatment of other goods.
  • The catalytic coating of the honeycomb body usually consists of a slurry of oxidic carrier materials in water. The slurry may further contain precursor compounds of catalytically active noble metals and promoters. These are often nitrates or chlorides of these noble metals and promoters, which are converted into the actual catalytically active components only by the calcination in the tunnel kiln. By drying and calcination water vapor and nitrogen oxides or chlorine compounds are released, which must be discharged together with a part of the furnace air from the tunnel kiln with simultaneous replacement by fresh air and optionally fed to an exhaust gas detoxification.
  • From the loading station, the honeycomb bodies generally first pass into a drying zone in which they are dried at a temperature of about 100 to 200 ° C. After passing through the drying zone they enter the calcination zone, where they are treated at temperatures of 300 to 600 ° C. Then they leave the tunnel kiln via the unloading station.
  • Object of the present invention is to provide a tunnel oven, which is particularly space-saving and optimally utilizes the heating energy used and thus contributes to energy savings.
  • This object is achieved by a tunnel furnace for the temperature treatment of goods (12, 12 ') having a tunnel-shaped furnace space through which the goods to be treated are transported in a direction of passage, wherein the tunnel furnace in the direction of passage has a plurality of tunnel segments (10) flanged together. The tunnel kiln is characterized in that each tunnel segment contains at least one fan (15) and at least one heating element (17) and a fresh air intake duct (19) and an exhaust duct (22) for waste air laden with exhaust gases and water vapor and the / Blower in the tunnel segments is / are arranged such that it / a circulation flow (23) with a downward and an upward flow across the Can produce passage direction, wherein two parallel conveyor belts (11, 11 ') are provided for the goods in the downward and upward flow and wherein the cross section of the tunnel oven perpendicular to the passage direction through a vertical flow baffle (13) is divided into two halves.
  • According to the invention, a circulation flow is generated transversely to the passage direction of the goods in the tunnel segments of the blower or blowers and the goods to be treated are transported by the circulation flow both on the pressure and on the suction side of the blower. As a result, the generated gas stream is used optimally for the treatment of the goods. Depending on the arrangement of the fans, the downward or upward flow is on the pressure side or on the suction side of the fan or vice versa. Preferably, the fan is driven by a motor which is arranged in the intake channel for the fresh air.
  • Preferably, the tunnel segments have a rectangular cross-section and are each bounded by a bottom, a ceiling and two side walls, the fans are preferably introduced from below through the bottom in the furnace chamber. To facilitate general maintenance and repair work, the side walls of the tunnel segments can be designed hinged.
  • In the furnace chamber flow guide plates and perforated or slotted plates for uniform arrival and optionally flow through the goods to be treated can be arranged to guide the air flow. In addition, the Strömungsleitbleche support the formation of the desired circulation flow.
  • Both gas or oil burners or electric heating elements are suitable for heating the furnace space. Preferably, electrical heating elements are used.
  • To reduce heat losses, it is advantageous to arrange the exhaust passage inside the furnace chamber. Preferably, therefore, the exhaust duct is laid inside the tunnel segments. The exhaust duct collects the exhaust air of the individual circulation flows and leads them outwards at a central point. If necessary, the exhaust air can be supplied to an exhaust gas detoxification.
  • The fans located inside the tunnel segments must be serviced or repaired from time to time. In a preferred embodiment of the tunnel kiln, therefore, the fans are flanged to the tunnel segment for the purpose of easy replacement with part of the floor or sidewall.
  • For transporting the goods through the tunnel kiln cars or conveyor belts can be used. Preferably, conveyor belts are used. In this case, the goods to be treated on the suction and pressure side of the blower on two parallel conveyor belts are transported by the circulation flows. For simplicity, both bands can be driven by a common drive. Preferably, the fan is arranged under only one of the conveyor belts with only a part of the goods.
  • The tunnel kiln is used, for example, for the drying and calcining of catalyst layer coated ceramic or metallic honeycomb bodies for the production of autocatalysts. For this purpose, the desired temperature profile is set along the direction of passage of the tunnel kiln by controlling the heating elements of the tunnel segments. The goods to be treated are transported on the parallel conveyor belts by the downward and upward flow of the circulation flow, wherein in each case a part of the circulation flow to remove released during the temperature treatment of the goods exhaust gases and water vapor is discharged from the furnace and replaced by an appropriate amount of fresh air.
  • The modular design of the tunnel kiln makes it possible to insert other stations, such as a station for reductive treatment of the goods with, for example, forming gas, between the tunnel segments according to the invention. Furthermore, it is possible to replace the heating of a selected tunnel segments, if necessary, by cooling.
  • If only small numbers of goods to be treated in the oven, it may be advantageous to build a chamber furnace on the basis of only one tunnel segment, wherein the conveyor belts are replaced by corresponding supporting grates.
  • In the tunnel furnaces discussed in the introduction to the introduction with a circulation flow transversely to the passage direction, the goods to be treated are only flowed through in one direction by the heating air. The return flow is guided around the goods on the outside. This means that the individual tunnel segments must have a wider cross section than is necessary for the transport of the goods. In contrast, in the present invention, the return flow of the circulation flow is utilized for the treatment of the goods. As a result, the individual tunnel segments can be designed correspondingly more compact. Experience of the inventor shows that up to 30% lateral surface of a tunnel segment can be saved by the invention. This means a considerable saving in steel sheets and heat insulation. In addition, the heat radiation is reduced in accordance with the saved lateral surface, which can not be completely avoided despite good insulation. The tunnel kiln according to the invention thus also contributes significantly to the saving of energy.
  • The invention will be explained in more detail with reference to the following figures. Show it:
  • FIG. 1:
    Side view of a tunnel kiln
    FIG. 2:
    Cross section through a tunnel segment
  • FIG. 1 shows the basic structure of a tunnel kiln (1). At the beginning and end of the tunnel kiln is a loading station (2) for loading the tunnel kiln with the goods to be treated, or an unloading station (3) for removing the treated goods. The tunnel kiln consists of several flanged tunnel segments (4). Temperatures between 100 and 600, preferably between 100 and 500 ° C are required for the drying and calcination of autocatalysts. The modular design of the furnace makes it possible to set the treatment temperature for each tunnel segment largely independent of adjacent segments. Thus, it is possible to adjust the temperature in the oven for drying the wet catalysts between 100 and 200 ° C then to the loading station. For example, after passing through this drying zone, the oven temperature is raised to 300 to 600 ° C to calcine the catalyst coating.
  • FIG. 2 shows by way of example the cross section of a tunnel segment (10) perpendicular to the direction of passage. The cross section of the tunnel segment is rectangular and is limited by a bottom plate (24), a ceiling (25) and by the two side walls (26 and 27). The cross section of the tunnel kiln is divided into two halves by a vertical flow baffle (13). In both halves is ever a conveyor belt (11, 11 ') for the goods to be transported through the tunnel (12, 12'). The conveyor belts are expediently perforated to impede the circulation flow as little as possible. In FIG. 2 the longitudinal extent of the conveyor belts is directed perpendicular to the plane of the drawing. A fan (15) is flanged from below to the tunnel furnace and serves to generate the circulation flow (23). The fan is driven by the motor (16). The gas flows in the tunnel segment are in FIG. 2 indicated by dashed arrows. On the suction side of the blower fresh air (18) via a suction passage (19) is sucked. The fresh air (20) is brought by a heating element (17) to the necessary treatment temperature. For cooling the fan motor, it is advantageous to arrange the motor in the intake duct for the fresh air. The hot exhaust gas laden with exhaust gases (21) is collected by an exhaust gas duct (22) and led to a central disposal point. To use the heat content of the exhaust gas, it is advantageous to lay the exhaust duct (22) in the interior of the tunnel segments. The flow conditions in the tunnel segment can be influenced by suitable Strömungsleitbleche and diaphragms so that the goods to be treated are flown as evenly as possible. Exemplary is in FIG. 2 only another Strömungsleitbleich (14) shown. The necessary thermal insulation of the walls of the tunnel segment are in FIG. 2 not shown for the sake of clarity.

Claims (12)

  1. Tunnel furnace comprising a furnace chamber and a throughput direction for the temperature treatment of goods (12, 12'), the tunnel furnace including a plurality of tunnel segments (10) flanged together in the throughput direction,
    characterized in that
    each tunnel segment includes at least one blower (15) and at least one heating element (17) as well as an intake duct (19) for fresh air and an exhaust duct (22) for exhaust air laden with exhaust gases and water vapor, and in that the blower(s) in the tunnel segments is/are arranged in such a way that it/they can produce a circulation flow (23) with a downward and an upward flow transverse to the throughput direction, two parallel conveyor belts (11, 11') being provided for the goods in the downward and upward flow, the cross section of the tunnel furnace being divided into two halves perpendicularly to the throughput direction by a vertical flow guide plate (13).
  2. Tunnel furnace according to claim 1,
    characterized in that
    the blower (15) is driven by a motor (16) which is arranged in the intake duct (19) for the fresh air (18).
  3. Tunnel furnace according to claim 1,
    characterized in that
    the tunnel segments have a rectangular cross section and are each delimited by a base plate (24), a ceiling (25) and two side walls (26, 27), the blower being introduced from below through the base into the furnace chamber.
  4. Tunnel furnace according to claim 3,
    characterized in that
    flow guide plates (13) for guiding the air flow and perforated or slotted plates (14) for even inflow to the goods to be treated are arranged in the furnace chamber.
  5. Tunnel furnace according to claim 4,
    characterized in that
    the heating elements (17) are electrically operated.
  6. Tunnel furnace according to claim 5,
    characterized in that
    the exhaust pipe (22) collects the exhaust air of the individual circulation flows and conducts them outside at a central point.
  7. Tunnel furnace according to claim 6,
    characterized in that
    the exhaust duct (22) is laid inside the tunnel segments.
  8. Tunnel furnace according to claim 6,
    characterized in that
    the side walls of the tunnel segments are designed to be foldable in order to facilitate maintenance and repair work.
  9. Tunnel furnace according to claim 1,
    characterized in that
    the two conveyor belts are driven by a common drive.
  10. Tunnel furnace according to claim 1,
    characterized in that
    the blower (15) is arranged below only one of the conveyor belts (11') with only a portion of the goods (12').
  11. Use of the tunnel furnace according to any of the preceding claims for the drying and calcining ceramic or metallic honeycomb bodies coated with catalyst layers.
  12. Method for operating the tunnel furnace according to any of the preceding claims,
    characterized in that
    the desired temperature profile is adjusted along the throughput direction of the tunnel furnace by controlling the respective heating elements, and the goods to be treated are transported on the parallel conveyor belts through the downward and upward flow of the circulation flow, a portion of the circulation flow in each case being discharged from the furnace in order to remove exhaust gases and water vapor released during the temperature treatment of the goods, and replaced by a corresponding quantity of fresh air.
EP08853545.5A 2007-11-26 2008-11-24 Tunnel furnace for the temperature treatment of goods Active EP2220449B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102007057237A DE102007057237A1 (en) 2007-11-26 2007-11-26 Tunnel kiln for the temperature treatment of goods
PCT/EP2008/066092 WO2009068505A1 (en) 2007-11-26 2008-11-24 Tunnel furnace for the temperature treatment of goods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL08853545T PL2220449T3 (en) 2007-11-26 2008-11-24 Tunnel furnace for the temperature treatment of goods

Publications (2)

Publication Number Publication Date
EP2220449A1 EP2220449A1 (en) 2010-08-25
EP2220449B1 true EP2220449B1 (en) 2019-05-08

Family

ID=40292545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08853545.5A Active EP2220449B1 (en) 2007-11-26 2008-11-24 Tunnel furnace for the temperature treatment of goods

Country Status (11)

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US (1) US8476559B2 (en)
EP (1) EP2220449B1 (en)
JP (1) JP5656639B2 (en)
CN (1) CN101874188B (en)
BR (1) BRPI0819905B1 (en)
CA (1) CA2706615C (en)
DE (1) DE102007057237A1 (en)
PL (1) PL2220449T3 (en)
RU (1) RU2495346C2 (en)
WO (1) WO2009068505A1 (en)
ZA (1) ZA201003934B (en)

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Publication number Priority date Publication date Assignee Title
US7155876B2 (en) 2003-05-23 2007-01-02 Douglas Machine, Inc. Heat tunnel for film shrinking
CN102135377A (en) * 2011-03-02 2011-07-27 西南交通大学 Heat treatment furnace for dynamically and continuously preparing high-temperature superconductive strip with fluorine-free chemical solution deposition method
CN102343991B (en) * 2011-10-10 2013-12-11 楚天科技股份有限公司 Tunnel type sterilizing drier
FR3032265B1 (en) * 2015-02-04 2017-02-10 Fives Stein Method for controlling oven from measurements of formed calamine
JP6474286B2 (en) * 2015-03-09 2019-02-27 ヤマト科学株式会社 Clean exhaust system
JP6200924B2 (en) * 2015-09-07 2017-09-20 トーホーエンジニアリング株式会社 Hot air circulation furnace
EP3424595A1 (en) 2017-07-06 2019-01-09 Umicore Ag & Co. Kg Coating apparatus and method

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DE1251470B (en)
US1488910A (en) 1920-02-25 1924-04-01 American Dressler Tunnel Kilns Continuous heating method and apparatus
US3463465A (en) 1967-11-30 1969-08-26 Emhart Corp Glassware annealing lehr having individual modules with self-contained air recirculating means
US3884667A (en) 1972-11-21 1975-05-20 Smit Nijmegen Bv Tunnel furnace, and a method of operating same
US4065251A (en) 1976-08-03 1977-12-27 Associated Electrical Industries Limited Furnaces
FR2390691A2 (en) 1977-05-14 1978-12-08 Riedel Rudolf Tunnel kiln for ceramic prods. - where gases used in the cooling zone are fed through the heating zone to raise thermal efficiency
EP0177917A2 (en) 1984-10-08 1986-04-16 Rudolf Riedel Tunnel furnace with two paralel ducts
JPS61134583A (en) * 1984-12-06 1986-06-21 Kurosaki Rokogyo Kk Continuous industrial kiln
DE10140007A1 (en) 2001-08-16 2003-03-13 Schott Glas Cooling conveyor oven comprises a conveying device consisting of a conveyor belt, a housing enclosing the conveyor belt, a ventilator for introducing air to the glass parts, and a heating device for tempering the air
US20030143098A1 (en) 2000-06-28 2003-07-31 Hartmut Weber Method and device for sintering aluminum based sintered parts
EP1049904B1 (en) 1997-12-22 2007-08-01 Corning Incorporated Method for firing ceramic honeycomb bodies and a tunnel kiln used therefor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1251470B (en)
US1488910A (en) 1920-02-25 1924-04-01 American Dressler Tunnel Kilns Continuous heating method and apparatus
US3463465A (en) 1967-11-30 1969-08-26 Emhart Corp Glassware annealing lehr having individual modules with self-contained air recirculating means
US3884667A (en) 1972-11-21 1975-05-20 Smit Nijmegen Bv Tunnel furnace, and a method of operating same
US4065251A (en) 1976-08-03 1977-12-27 Associated Electrical Industries Limited Furnaces
FR2390691A2 (en) 1977-05-14 1978-12-08 Riedel Rudolf Tunnel kiln for ceramic prods. - where gases used in the cooling zone are fed through the heating zone to raise thermal efficiency
EP0177917A2 (en) 1984-10-08 1986-04-16 Rudolf Riedel Tunnel furnace with two paralel ducts
JPS61134583A (en) * 1984-12-06 1986-06-21 Kurosaki Rokogyo Kk Continuous industrial kiln
EP1049904B1 (en) 1997-12-22 2007-08-01 Corning Incorporated Method for firing ceramic honeycomb bodies and a tunnel kiln used therefor
US20030143098A1 (en) 2000-06-28 2003-07-31 Hartmut Weber Method and device for sintering aluminum based sintered parts
DE10140007A1 (en) 2001-08-16 2003-03-13 Schott Glas Cooling conveyor oven comprises a conveying device consisting of a conveyor belt, a housing enclosing the conveyor belt, a ventilator for introducing air to the glass parts, and a heating device for tempering the air

Also Published As

Publication number Publication date
JP5656639B2 (en) 2015-01-21
EP2220449A1 (en) 2010-08-25
RU2010125105A (en) 2012-01-10
BRPI0819905A2 (en) 2015-05-19
US20100301033A1 (en) 2010-12-02
DE102007057237A1 (en) 2009-05-28
CN101874188B (en) 2012-12-19
CN101874188A (en) 2010-10-27
US8476559B2 (en) 2013-07-02
BRPI0819905B1 (en) 2018-01-02
CA2706615A1 (en) 2009-06-04
CA2706615C (en) 2015-11-03
WO2009068505A1 (en) 2009-06-04
ZA201003934B (en) 2011-02-23
JP2011504573A (en) 2011-02-10
RU2495346C2 (en) 2013-10-10
PL2220449T3 (en) 2020-03-31

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