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EP2754958B1 - Tube de chauffage radiant - Google Patents

Tube de chauffage radiant Download PDF

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Publication number
EP2754958B1
EP2754958B1 EP13150878.0A EP13150878A EP2754958B1 EP 2754958 B1 EP2754958 B1 EP 2754958B1 EP 13150878 A EP13150878 A EP 13150878A EP 2754958 B1 EP2754958 B1 EP 2754958B1
Authority
EP
European Patent Office
Prior art keywords
radiant tube
tube
thermal insulation
longitudinal end
radiant
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
EP13150878.0A
Other languages
German (de)
English (en)
Other versions
EP2754958A1 (fr
Inventor
Dominik Schröder
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.)
LOI Thermprocess GmbH
Original Assignee
LOI Thermprocess GmbH
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 LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Priority to EP13150878.0A priority Critical patent/EP2754958B1/fr
Publication of EP2754958A1 publication Critical patent/EP2754958A1/fr
Application granted granted Critical
Publication of EP2754958B1 publication Critical patent/EP2754958B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/126—Radiant burners cooperating with refractory wall surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic
    • F23D2212/103—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • the invention is directed to a horizontally mounted radiant tube for indirectly heating an industrial furnace comprising a tubular body comprising a central portion and at least one return portion located adjacent to the central portion, and at least one shoulder serving to support or suspend a free longitudinal end of the radiant tube wherein the middle section and the at least one return section are flow-connected to one another via at least one deflection section, the other longitudinal end of the radiant tube opposite the free longitudinal end can be fixed in a wall of the industrial furnace and has at least one opening to which a burner serving to heat the radiant tube can be connected, and the deflecting section deflecting at least one combustion exhaust gas within the radiant tube the free longitudinal end of the radiant tube is arranged.
  • a radiant tube of the type mentioned is, for example, from DE 20 2008 009 065 U1 , of the DE 29 20 902 A1 as well as the DE 20 2012 103 366 U1 is known and used to heat an industrial furnace when the atmosphere of the furnace chamber has to be adjusted in a certain way and does not allow the interference of air and exhaust gases.
  • a radiant heating pipe is heated on the inside by a heat source designed as a burner and is thereby heated, whereby a material located in the furnace chamber is heated by the heat radiation emanating from the radiant heat pipe.
  • radiant tubes are used as radiant tubes, as in the DE 29 20 902 A1 described, or with several arms or branches, as exemplified by a double-P-beam tube in the DE 20 2008 009 065 U1 disclosed executed.
  • a longitudinal end of the radiant heating pipe extends through a furnace wall, wherein the outside or outside the furnace usually a burner is flanged. Due to the design, the weight must be intercepted, in particular with metallic radiant heaters to avoid their bending.
  • the hot combustion exhaust gases flow through a central portion of the radiant heating tube in the direction of the free longitudinal end, where they are deflected and in a return to the return section, through which they are passed in the region of the burner from the Strahlskyrohr.
  • the wall of the free longitudinal end of the radiant tube is particularly strongly heated, whereby the strength values of the wall of the radiant tube, at least in the region of the free longitudinal end sink to values that when trapping the weight on the example tubular-shaped approach to plastic Deformations of the free longitudinal end of the Strahlitzrohres, which may be formed, for example, as kumpelêt lead.
  • the invention has for its object to provide a solution that provides a radiant heat pipe in a structurally simple manner, which in particular in the region of its support or suspension has improved strength at high operating temperatures and consistently good performance for a long service life.
  • this object is achieved in that the inner wall of the radiant tube at the free longitudinal end is at least partially covered with a thermal insulation.
  • a StrahlMaprohr comprising a tubular body comprising a central portion and at least one disposed adjacent the central portion return portion, and at least one serving for supporting or suspension of a free longitudinal end of the radiant heater neck, the outside at the free longitudinal end of the Radiant heat pipe is mounted, wherein the central portion and the at least one return section are fluidly connected to each other via at least one deflecting portion, the free longitudinal end opposite, the other longitudinal end of the Strahl2020rohres at least one opening and the at least one deflection section is disposed at the free longitudinal end of the radiant tube wherein the inner wall of the radiant tube at the free longitudinal end is at least partially covered with a thermal insulation, which is a material with a sauceleitschreibkei t of less than 0.6 W / (m ⁇ K).
  • the invention provides an improved radiant heat pipe in which the combustion exhaust gases no longer impinge on the inner wall of the radiant tube or Strahlskyrohrendes in their deflection in the region of the free longitudinal end now. Rather, the deflection is now - viewed from the direction of the burner or the furnace wall - in front of the inner wall of the radiant tube in the region of the free longitudinal end of the thermal insulation.
  • the wall of the Strahlskyrohres is in the area of the deflection at the free longitudinal end by the thermal insulation before too strong Warming protected, which means that the protected by the thermal insulation wall of the radiant tube is heated by at least 50 ° C less, which may mean an increase in strength by a factor of 2 to 5 in the temperature limit range of Strahlskyrohrmaterials.
  • the thermal insulation in particular reducing or even preventing the bending of the wall in the region of the extension.
  • the thermal insulation may also protect welded joints, such as a weld over which the neck may be attached to the radiant tube.
  • the inner wall is at least partially covered by the thermal insulation in the region of at least one deflection section.
  • the invention provides in a further embodiment that at least the approach to the opposite portion of the inner wall of the radiant tube is covered by the thermal insulation.
  • the goal must be achieved that the strength of the approach and the strength of the connection of the approach to the radiant tube at the given operating temperatures and weight forces is not deformed.
  • the thermal insulation is a high-temperature ceramic wool-containing vacuum molding.
  • a molded part consists of particularly temperatur pizza casting material and can be used depending on the choice of the ceramic base material, for example, up to 1800 ° C application temperature, which is far above the usual operating temperature of radiant tubes.
  • the thermal insulation can be formed from a refractory, fireclay or insulating brick to cover the inner wall of the radiant heating pipe in the region of the free end or in the region of the deflection section and to protect it from direct contact with the combustion exhaust gases to be deflected.
  • a particularly good thermal insulation can be achieved in the radiant heat pipe according to the invention in that the thermal insulation has a material with a thermal conductivity of less than 0.6 W / (m ⁇ K).
  • the thermal insulation has a wall thickness in the tube longitudinal direction of at most one third of the diameter of the radiant tube.
  • the thickness of the thermal insulation must be chosen so that the temperature at the transition to the approach is lowered so far that the weight forces can be absorbed without deformation of the radiant tube.
  • the invention provides in a further embodiment, that the thermal insulation has a temperature of the radiant tube in the region of the approach such reducing wall thickness in the tube longitudinal direction that absorbed by approach forces when suspending or supporting the free longitudinal end of the radiant tube neither the approach nor the free longitudinal end or plastically deform a transition region between the free longitudinal end and the extension.
  • the insulation at Strahlrahlrohrende may be constructed in sandwich construction, in which case at least one formed at least in the region of the free longitudinal end Material layer is the thermal insulation, so that the thermal insulation is at least partially embedded as a material layer in the base material of the radiant tube.
  • the thermal insulation itself may be constructed in sandwich construction.
  • the invention provides in an embodiment that the thermal insulation has at least two different, different properties and having layers arranged one behind the other in the tube longitudinal direction. In this case, material layers with different properties can be advantageously combined to achieve the desired goal.
  • at least one of the at least two layers of the thermal insulation may comprise metal or mineral insulating material or ceramic insulating material.
  • the radiant tube according to the invention which is installed horizontally in the oven, can be designed in different construction.
  • the Strahltropicrohr be designed as a jacket jet pipe, in which case the central portion is defined by a flame tube.
  • the radiant heating tube may be formed to enlarge the radiating surface as a P-beam tube, a double P-beam tube, a U-beam tube or a W-beam tube. It can be seen that the invention is suitable for all types of radiant heating pipes, irrespective of whether or not the design permits internal recirculation of the combustion exhaust gases.
  • FIGS. 1 to 4 Various embodiments of a radiant tube according to the invention are shown.
  • the Strahlskyrohre shown serve the indirect heating of an industrial furnace, not shown, which is defined as a space enclosed by walls, in which a good heat is supplied by means of the Strahlskyrohres.
  • FIG. 1 is an inventive StrahlMaprohr 1 according to a first embodiment
  • FIG. 2 an inventive radiant tube 1 'according to a second embodiment
  • FIG. 3 an inventive StrahlMaprohr 1 "according to a third embodiment and in FIG.
  • the radiant tube 1, 1 ', 1 ", 1"' installed horizontally in the furnace has a tubular body 2 which, depending on the design, can be configured differently always a first longitudinal end 3 of the tubular body 2 and the Strahltropicrohres 1, 1 ', 1 ", 1"' passed through a furnace wall 4 of the industrial furnace, so that the tubular body 2 is arranged horizontally extending in the furnace chamber 5 and can radiate its heat there.
  • the tubular body 2 fastened with its first longitudinal end 3 to the wall or furnace wall 4 is heated by hot combustion exhaust gases of a burner 6 arranged outside of the furnace chamber 5.
  • the burner 6 is shown only schematically in the figures Recuperator 13 in the tubular body 2 in and flow through a central portion 8 of the tubular body, in the direction of the free End 9 of the tubular body 2 leads, as the drawn arrow 10 indicates.
  • Combustion air is supplied to the burner 6 via a connection 11 and combustion gas via a further connection 12, wherein a recuperator 13 can be provided for utilizing the heat of the combustion exhaust gases before the combustion exhaust gases are removed from the tubular body 2 via the connection 14.
  • the tubular body 2 has at least one deflection section 15, at which the combustion exhaust gases are deflected in the direction of the burner 6.
  • the respective deflection section 15 in the individual embodiments connects in the case of the jacket jet pipe 16 (see FIGS. 1 .
  • the middle section 8 with a return section 19 which is formed by the annular space between the flame tube 17 and the nozzle jet pipe 16.
  • the two deflecting sections 15 have the tubular central section 8 with two tubular return sections 19 ', which lead back to the first longitudinal end 3 of the tubular body 2, whereby combustion exhaust gas can partially reach the central section 8 again.
  • the or the deflecting sections 15, on which or at which the combustion exhaust gases within the radiant tube 1, 1 ', 1 ", 1"' are deflected, is or are at the free longitudinal end 9 of the radiant tube 1, 1 ', 1 " , 1 '"arranged.
  • the inner wall 21 of the respective Strahlitzrohres 1, 1 ', 1 ", 1'" at the free longitudinal end 9 at least partially covered with a thermal insulation 22, whereby excessive heating of the inner wall 21 is prevented, which in turn a desired increase in Strength in this area.
  • the insulation covers the entire bottom-shaped longitudinal end 9 of the radiant tube 1, so that the deflection of the combustion exhaust gases takes place before the thermal insulation 22 and thus before the inner wall 21, whereby the longitudinal end 9 is heated less than the remaining wall portion of the radiant tube 1, which of the combustion exhaust gas is still heated.
  • the radiant heating pipe 1 ' is designed in the manner of a double P-beam pipe, the entire longitudinal end 9 is covered by the thermal insulation 22.
  • a heat-resistant plate 23 is provided, for example, metal or ceramic, through which a direct contact of the thermal insulation 22 with the in this Be prevented area deflected combustion exhaust gases, because the combustion exhaust gases are deflected at the now the deflection section 15 defining plate 23.
  • the plate 23 thus forms a kind of protective shield for the thermal insulation 22 so that it is not exposed directly to the hot combustion exhaust gases.
  • a plurality of through-openings formed in the flame tube 17 form the deflection sections 15 between the middle section 8 and the annular gap-shaped return section 19, in particular the inner wall 21 only in sections in the region of the middle section 8 or only at the end of the flame tube 17 is covered by the thermal insulation 22.
  • the deflection sections 15 in the form of the passage openings are indicated only schematically and it is understood that these can vary in shape and number.
  • the thermal insulation 22 in all embodiments of the radiant heating pipe 1, 1 ', 1 ", 1"' at least the section or region of the inner wall 21 opposite the projection 20 is covered by the thermal insulation 22.
  • the thermal insulation 2 may be a high-temperature wool exhibiting vacuum molding or be formed from a refractory or insulating stone.
  • the thermal insulation 22 may also be made of vacuum-formed ceramic fibers. It should be desirable for the thermal insulation 22 to comprise a material having a thermal conductivity of less than or equal to 0.6 W / (m ⁇ K).
  • thermal insulation 22 has a wall thickness 24 in the pipe longitudinal direction of at most one third of the diameter 25 of the radiant heating pipe 1 ", as shown in FIG. 3 is shown as an example.
  • the thermal insulation 22 it is at least necessary for the thermal insulation 22 to have a wall thickness or wall thickness 24 reducing the temperature of the radiant heating tube 1, 1 ', 1 ", 1"' in the region of the extension 20 in the tube longitudinal direction has to be absorbed by the approach 20 forces when suspending or supporting the free longitudinal end 9 of the radiant tube 1, 1 ', 1 ", 1"' neither the approach 20 nor the free longitudinal end 9 or a transition region between the free longitudinal end 9 and the approach 20th plastically deform.
  • the thermal insulation 22 may be formed homogeneously and from a single material or material. Alternatively, it is also conceivable that the thermal insulation 22 is formed layer of different materials. It is conceivable here that the thermal insulation 22 has at least two different, different properties and arranged one behind the other in the tube longitudinal layers 22, 23, wherein at least one of the at least two layers 22, 23 of the thermal insulation 22 metal or mineral insulating material or ceramic insulating material can.
  • the material of the Strahlskyrohres in the wall region of the support serving for approach approach is less heated than the other wall portions of the Strahlskyrohres , which can increase the strength by a factor of 2 to 5 in the temperature limit range of the radiant tube material.
  • the invention has been described in particular using the example of a jacket jet for an industrial furnace, wherein the Strahlskyrohr is formed gas-tight on one side at one of its two longitudinal ends and on the closed longitudinal end formed on the outside a protruding approach to support the closed longitudinal end formed.
  • the sealed longitudinal end or the bottom of the radiant tube is provided on the inside with an insulation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)

Claims (9)

  1. Tube de chauffage radiant (1,1',1",1"') pour le chauffage indirect d'un four industriel, qui comporte au moins un corps tubulaire (2), comprenant une section centrale (8) et au moins une section de retour (19,19') disposée près de la section centrale (8) et au moins un téton en saillie (20) prévu à l'extrémité longitudinale libre (9) à l'extérieur sur le tube de chauffage radiant (1,1',1",1"'), servant à soutenir ou à suspendre une extrémité longitudinale (9) libre du tube de chauffage radiant (1,1',1",1"'),
    la section centrale (8) et au moins une section de renvoi (19,19') étant reliées en communication fluide l'une à l'autre par le biais d'au moins une section de déviation (15),
    l'autre extrémité longitudinale (3) du tube de chauffage radiant (1,1',1",1"'), opposée à l'extrémité longitudinale libre (9) pouvant être fixée dans une paroi (4) du four industriel et comportant au moins une ouverture (7) à laquelle un brûleur (6) servant au chauffage du tube de chauffage radiant (1,1',1",1"') peut être raccordé, et
    au moins une section de déviation (19,19') déviant les gaz de combustion à l'intérieur du tube de chauffage radiant (1,1',1",1"') étant disposée à l'extrémité longitudinale libre (9) du tube de chauffage radiant (1,1',1",1"'),
    caractérisé en ce que
    la paroi intérieure (21) du tube de chauffage radiant (1,1',1",1"'), est recouverte à l'extrémité longitudinale libre (9) au moins par section d'une isolation thermique (22), qui comporte un matériau avec une thermoconductivité inférieure à 0,6 W/(m.K).
  2. Tube de chauffage radiant (1,1',1",1"') selon la revendication 1, caractérisé en ce que la paroi intérieure (21) est recouverte au moins par section d'une isolation thermique (22) dans la zone d'au moins une section de déviation (15).
  3. Tube de chauffage radiant (1,1',1",1"') selon la revendication 1 ou 2, caractérisé en ce qu'au moins la section de la paroi intérieure (21) du tube de chauffage radiant (1,1',1",1"'), opposée au téton en saillie (20) est recouverte par l'isolation thermique (22).
  4. Tube de chauffage radiant (1,1',1",1"') selon l'une quelconque des revendications précédentes, caractérisé en ce que l'isolation thermique (22) est une pièce moulée sous vide comportant une laine de céramique à haute température.
  5. Tube de chauffage radiant (1,1',1",1"') selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'isolation thermique (22) est formée d'une brique réfractaire ou isolante.
  6. Tube de chauffage radiant (1,1',1",1"') selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'isolation thermique (22) est composé de fibres céramiques moulées sous vide.
  7. Tube de chauffage radiant (1,1',1",1"') selon l'une quelconque des revendications précédentes, caractérisé en ce que l'isolation thermique (22) comporte une épaisseur de paroi (24) dans le sens longitudinal du tube au maximum d'un tiers du diamètre (25) du tube de chauffage radiant (1,1',1",1"').
  8. Tube de chauffage radiant (1,1",1'") selon l'une quelconque des revendications précédentes, caractérisé en ce que le tube de chauffage radiant (1,1",1'") est constitué comme un tube radiant d'enveloppe (16) et la section centrale (8) est définie par un tube à flammes (17).
  9. Tube de chauffage radiant (1') selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le tube de chauffage radiant (1') est constitué comme un tube radiant P, un tube radiant P double (18) un tube radiant en U ou un tube radiant W.
EP13150878.0A 2013-01-10 2013-01-10 Tube de chauffage radiant Active EP2754958B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13150878.0A EP2754958B1 (fr) 2013-01-10 2013-01-10 Tube de chauffage radiant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13150878.0A EP2754958B1 (fr) 2013-01-10 2013-01-10 Tube de chauffage radiant

Publications (2)

Publication Number Publication Date
EP2754958A1 EP2754958A1 (fr) 2014-07-16
EP2754958B1 true EP2754958B1 (fr) 2017-06-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13150878.0A Active EP2754958B1 (fr) 2013-01-10 2013-01-10 Tube de chauffage radiant

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EP (1) EP2754958B1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106594728A (zh) * 2016-12-16 2017-04-26 北京神雾环境能源科技集团股份有限公司 一种蛇形燃气辐射管
DE202017103336U1 (de) 2017-06-02 2018-09-04 Loi Thermprocess Gmbh Strahlungsheizrohr zum waagerechten Betrieb in einem Ofenraum eines Industrieofens
EP3410009A1 (fr) 2017-06-02 2018-12-05 LOI Thermprocess GmbH Tuyau chauffant par rayonnement à fonctionnement horizontal dans une chambre de four d'un four industriel
DE102020100748A1 (de) 2020-01-14 2021-07-15 Loi Thermprocess Gmbh Vorrichtung zum Abstützen von mindestens zwei Strahlheizrohren in einem Ofenraum sowie Industrieofen
CN115212670B (zh) * 2022-06-29 2023-07-04 成都易态科技有限公司 工业窑炉烟气净化装置及黄磷烟气净化系统

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Publication number Priority date Publication date Assignee Title
DE2314118C2 (de) * 1973-03-21 1979-10-11 Fa. J. Aichelin, 7015 Korntal Flammrohr für ein Mantelstrahlheizrohr eines Industrieofens
DE2920902A1 (de) 1979-05-23 1981-04-09 Loi Industrieofenanlagen Gmbh, 4300 Essen Vorrichtung zum beheizen eines industrieofens
US5932885A (en) * 1997-05-19 1999-08-03 Mcdermott Technology, Inc. Thermophotovoltaic electric generator
WO2009039399A1 (fr) * 2007-09-21 2009-03-26 Wessex Incorporated Tube rayonnant
DE202008009065U1 (de) 2008-07-04 2008-10-09 WS Wärmeprozesstechnik GmbH Strahlungsheizanordnung mit Verzugkompensation
DE202012103366U1 (de) * 2012-09-04 2012-10-08 WS - Wärmeprozesstechnik GmbH Strahlungsheizrohr

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