EP3410009A1 - Tuyau chauffant par rayonnement à fonctionnement horizontal dans une chambre de four d'un four industriel - Google Patents

Tuyau chauffant par rayonnement à fonctionnement horizontal dans une chambre de four d'un four industriel Download PDF

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Publication number
EP3410009A1
EP3410009A1 EP18174023.4A EP18174023A EP3410009A1 EP 3410009 A1 EP3410009 A1 EP 3410009A1 EP 18174023 A EP18174023 A EP 18174023A EP 3410009 A1 EP3410009 A1 EP 3410009A1
Authority
EP
European Patent Office
Prior art keywords
heating tube
thermally insulated
tube body
radiant heating
furnace
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.)
Withdrawn
Application number
EP18174023.4A
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German (de)
English (en)
Inventor
Dominikus 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
Priority claimed from DE202017103336.8U external-priority patent/DE202017103336U1/de
Application filed by LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Publication of EP3410009A1 publication Critical patent/EP3410009A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a Strahlungssammlungrohr for horizontal operation in a furnace chamber of an industrial furnace, with a Schuringianu which is connected at one end to a burner and held on a furnace wall of the furnace chamber and closed at the other free end and can be supported in the furnace chamber by means of a holder ,
  • the invention relates to an industrial furnace with a Strahlungs carvingrohr invention.
  • Radiant heating also called radiant tubes, are used for indirect heating of furnace chambers and are usually heated with burners, which are operated with a liquid or gaseous fuel.
  • the main component of a Strahlungssammlungrohres is a metallic heating tube body, which is connected at one end to a burner, usually flanged, is.
  • the heating tube body is at the burner end on a furnace wall, d. H. held in the furnace room insulation.
  • the other free end which is located opposite the burner and protrudes into the furnace chamber, is closed gas-tight in relation to the atmosphere in the furnace chamber.
  • the combustion exhaust gases of the burner flow towards the free end, where they are deflected and recycled to be directed out of the radiant heating tube.
  • a good which is to be heated in the furnace chamber of the industrial furnace, is consequently heated by means of heat radiation and does not come into contact with the burner exhaust gases.
  • the burner-side end of the Schurohr analysess the Strahlungssammlungrohres is usually stored in a furnace wall.
  • the furnace wall will be any area of the furnace room insulation.
  • Strahlungs202063e in the form of Mantelstrahlungsstrarohren usually extend through a furnace wall into the furnace chamber and are stored in this way in the furnace wall.
  • the heating tube body may have at one or both ends outside an approach for storage purposes. Out of practice it is known to form the heel as a steel pipe in radiant heating pipes made of steel, which is welded to the Schurohr Economics.
  • Radiant heating tubes for horizontal operation in a furnace chamber have a considerable weight, which must be intercepted at the free end in order to prevent bending, in particular of metallic Strahlungssammlungrohren. Under a horizontal operation are also understood operations in which the Strahlungssammlungrohr is operated at an arbitrary angle.
  • the object of the invention is therefore to provide a way as the support of metallic Strahlungssammlungrohren in horizontal operation in the furnace chamber of an industrial furnace can be ensured in a structurally simple manner.
  • the heating tube body at the free end on a thermally insulated portion extending in the axial direction of the Strahlungssammlungrohres over a predefined length, wherein the holder engages the thermally insulated portion.
  • the radiant heating tube is at its closed end in Oven chamber supported by a holder which comes to the thermally insulated portion of the Schuhmik stressess to rest or rest.
  • the thermally insulated section which comes to rest in the holder in the furnace chamber or to the support, is not flowed through by the hot combustion gases, so that the temperature load is reduced in the storage area.
  • the thermally insulated portion extending from the free end of the SchuhlSchtechnik analysess in the direction of the burner, wherein the Schurohrève is formed at the free end frontally without rudimentary.
  • the bracket for capturing the weight acts directly on the periphery of the SchuhlSchtechnikes within the thermally insulated portion.
  • the thermal insulation extends within the thermally insulated portion are preferably over the entire cross section of the heating tube body, so that the hot flue gases or combustion gases can not flow through the portion at which the holder engages for the purpose of support.
  • the predefined length of the thermally insulated portion is about two thirds of the diameter of the Schurohr stressess, but at least 100mm.
  • the predefined length of the thermally insulated portion is slightly larger than the width of the support (viewed in the axial direction), which comes to rest on the circumference of the Schurohr stressess or on the circumference of the approach.
  • the thermally insulated section has a thermal insulation formed as a vacuum molding having high temperature ceramic wool.
  • the thermal insulation may be formed as a refractory or insulating stone.
  • a preferred embodiment of the radiant heating tube is characterized in that the thermally insulated section has a thermal insulation which has at least two different, different properties In the longitudinal direction one behind the other arranged layers and / or that at least one of the at least two layers comprises a mineral insulating material or ceramic insulating material.
  • the flow-facing side of the insulating material must be designed so that the insulation withstands the flow of combustion gases in the radiant tube.
  • the thermally insulated portion has a thermal insulation with a thermal conductivity of less than 0.6W / (m ⁇ K).
  • the heating tube body is designed as a jacket jet pipe which concentrically surrounds a flame tube which has an outlet, wherein a deflection section for the combustion waste gases is formed between the outlet of the flame tube and the thermally insulated section.
  • the thermally insulated portion preferably has a thermal insulation, which is designed as a plug and can be inserted into the heating tube body.
  • the plug may be formed as a vacuum molding, which has high temperature ceramic wool.
  • the stopper is made of refractory or insulating stone.
  • the plug can be produced by casting from a refractory ceramic material.
  • Flame tubes of Mantelstrahlikirohren are usually made of a ceramic material, while the jacket jet pipe, which surrounds the flame tube, usually made of steel.
  • the length of the deflection between the outlet of the flame tube and the thermally insulated portion may change due to the large number of temperature changes, which could adversely affect the deflection of the hot combustion gases from the flame tube in the jacket tube. Therefore, in a preferred embodiment, a spacer permeable to the combustion exhaust gases extends in the axial direction of the flame tube in the deflection section and is integrally connected thereto.
  • the spacer and the thermally insulated section thus form a structural unit.
  • the spacer is preferably made of the same material as the thermally insulated section.
  • the thermally insulated portion is preferably formed plug-shaped with integrated spacer and can be easily inserted or mounted in the nozzle tube.
  • the spacer has a plurality of ribs, between which the combustion exhaust gases are deflected into the heating tube body, wherein the ribs seen in the axial direction of the flame tube extend from the axial center of the flame tube in the radial direction, preferably T-shaped, Y-shaped or cross-shaped.
  • Spacers with a T-shaped, Y-shaped or cross-shaped cross section are stable, have a long service life and can be relatively easily produced as part of a thermally insulated section in the form of a plug, especially in the casting process.
  • the heating tube body has a central portion and at least one arranged next to the central portion return portion, wherein the central portion and the return portion are fluidly connected to each other by means of a deflection section.
  • the radiant heating tube may be formed as a P-radiant heating tube, double P-radiant heating tube, U-radiant heating tube, or as a W radiant heating tube.
  • the thermally insulated portion may be formed as at least one approach, which is provided on the outside of the heating tube body at its free end.
  • the thermally isolated approach has the advantage that the temperature load in the storage area is reduced.
  • the approach can be designed as a steel tube, which is completely filled inside with a thermal insulation.
  • the object is further achieved by an industrial furnace having a furnace chamber and a Strahlungs2020 invention, wherein the Schuhlungs2020es is held at one end in a wall of the furnace chamber and wherein the other free end of the Schurohr stressess has a thermally insulated portion extending in the longitudinal direction of Radiant heating tube extends over a predefined length and wherein in the furnace chamber is a holder which engages the thermally insulated portion.
  • the holder is curved to the flat support of the Schuntz stressess.
  • a preferred development is characterized in that the holder is designed such that an axial movement of the heating tube body is possible.
  • the holder may be formed as an opening in a wall of the furnace chamber or as a hanging in the furnace chamber bearing.
  • Fig. 1 shows a furnace chamber 1 of an industrial furnace, not shown, with a Strahlungssammlungrohr 2, which is arranged for horizontal or horizontal operation in the furnace chamber 1.
  • the furnace chamber 1 is a space enclosed by furnace walls 3a, 3b, 3c, 3d in which a good 4 is to be heated.
  • the radiant heater 2 is used for indirect heating of the goods 4 by means of thermal radiation.
  • the radiant heating tube 2 is designed as a jacket radiant heating tube or jacket radiant heating tube, wherein a heating tube body 5 is designed as a jacket jet tube which concentrically surrounds a flame tube 6.
  • the heating tube body 5 is mounted at one end 7 in an opening in the furnace wall 3 a of the furnace chamber 1 and connected to a burner 8 shown schematically, which is located outside the furnace chamber 1.
  • the burner 8 is supplied with a gaseous fuel via a fuel connection 9 and combustion air via a combustion air connection 10.
  • the radiant heating tube 2 has a considerable weight, so that the projecting into the oven chamber 1 end 14 of the Schurohr stresses 5 must be supported.
  • a thermally insulated portion 15 is provided, on which a bracket 16 engages to support the free end 14.
  • the thermally insulated section 15 has a thermal insulation with a thermal conductivity of less than 0.6W / (m ⁇ K).
  • the thermal insulation in section 15 is designed as a plug which can be inserted into the heating tube body 5.
  • the stopper has a plurality of leg-shaped spacers, not shown, which extend between the heating tube body 5 or the jacket tube and the flame tube 6. Radiant heating pipes made of metal are operated in the meantime at the material power limit, so that by means of the thermally insulated portion 15, the service life of the radiant heating tube 2 can be doubled or even tripled.
  • the thermally insulated portion 15 has a thermal insulation formed as a vacuum molding having high temperature ceramic wool.
  • the thermal insulation is designed as a refractory or insulating stone.
  • the thermally insulated section 15 extends from the free end 14 of the heating tube body 5 over a predefined length A in the longitudinal direction or axial direction of the heating tube body 5.
  • the length A of the thermally insulated section 15 depends on the thermal conductivity of the thermal insulation.
  • the length of the thermally insulated portion 15 is inversely proportional to the thermal conductivity of the respective thermal insulation.
  • the length A of the thermally insulated portion 15 of the Edelrohr stressess 5 is about two thirds of the diameter D of the Schurohr stressess 5, but at least 100mm.
  • the thermally insulated section 15 at the end of the heating tube body 5 allows the heating tube body 5 can be frontally formed in a structurally simple manner lump-free and supported by a bracket 16 which engages directly on the circumference or the longitudinal wall of the heating tube body 5. It is crucial that the heating tube body 5 in the wall region in which the holder 16 acts on the heating tube body 5 or in the region of the support of the heating tube body 5 on the holder 16 is not flowed through with hot flue gases or combustion gases.
  • the heating tube body 5 is formed in the embodiment at the closed end frontally straight. Alternatively, the closed end 14 of the heating tube body 5 may be curved on the end side.
  • the holder 16 is formed as a curved formed wall pocket in the second furnace wall 3b, which lies opposite the first furnace wall 3a.
  • the holder 16 in the form of the wall pocket is curved, so that a flat support of the Schuh stressess 5 in the wall pocket is possible to optimally absorb the weight of the Strahlskyrohres 2.
  • the radiant heating tube 2 is supported by means of furnace walls 3a, 3b opposite one another.
  • the free end 14 of the heating tube body 5 has a thermally insulated section 15 with a first insulating layer 15a and a second insulating layer 15b, which are arranged one behind the other in the axial direction. At least one of the two insulating layers 15a, 15b comprises a mineral insulating material or ceramic insulating material.
  • the first insulating layer must be wear resistant to the flow of hot flue gases.
  • the predefined length A of the thermally insulated portion 15 of the Schurohr stressess 5 is about two-thirds of the diameter D of the Schurohr stressess 5, but at least 100mm.
  • the heating tube body 5 is designed such that the holder 16 acts on the circumference or the longitudinal wall of the heating tube body 5 in the region of the thermally insulated section 15.
  • the predefined length A of the thermally insulated portion 15 is slightly larger than the width of the holder 16 in the longitudinal direction of the heating tube body fifth
  • the thermally insulated portion 15 of the Edelrohr stresses 5 is not traversed by hot flue gases or combustion gases due to the thermal insulation, so that the thermal load in this area, in which the holder 16 engages, depending on the selected insulation, is relatively low.
  • the holder 16 is formed as a hanging holder which is fixed in the oven chamber 1.
  • the holder 16 is arched and engages the Schustermaschine 5 on the thermally insulated portion 15 at its periphery or on the longitudinal wall of the Schurohr stressess 5 at.
  • the holder 16 is formed so that an axial movement of the heating tube body 5 is possible.
  • Fig. 3 shows a schematic representation of a section through the closed end 14 of the radiant heater 2 in Fig. 2 in the region of the support of the thermally insulated portion 15 of the heating tube body 5 in the holder 16.
  • the thermal insulation extends in section 15 over the entire cross section of the heating tube body fifth
  • Fig. 4 shows a schematic representation of a Strahlungssammlungrohres 2 according to the invention in the form of a double P-Strahlungssammlungrohres.
  • the heating tube body 5 has a middle section 17 and two return sections 18 and 18 'arranged next to the central section 17.
  • the middle section 17 and the return sections 18 and 18 ' are fluidly connected to one another by means of a deflection section 11.
  • the heating tube body 5 is mounted at one end 7 in a furnace wall 3a of the furnace chamber 1 and connected to a burner 8 shown schematically, which is located behind the furnace wall 3a.
  • the burner 8 is supplied with a gaseous fuel via a fuel connection 9 and combustion air via a combustion air connection 10.
  • the hot combustion exhaust gases of the burner 8 flow through the middle section 17 and are diverted in a deflection section 11 into the return sections 18, 18 '.
  • the thermally insulated portion 15 is formed as at least one approach, which is provided on the heating tube body 5 at the free end of the front end outside.
  • the thermally isolated approach has the advantage that the temperature load in the area of storage is reduced.
  • the approach can be designed as a steel tube, which is completely filled inside with a thermal insulation.
  • Fig. 5 shows a schematic representation of a section of a Strahlungssammlungrohres invention in the form of a Mantelstrahlikirohres in a second embodiment.
  • the jacket radiant tube after Fig. 5 is basically like that in Fig. 1 constructed Mantelstrahlikirohr constructed. It could also be like that in Fig. 2 be shown Mantelstrahlsortrohr be constructed.
  • a deflection section 11 is formed, in which the hot combustion exhaust gases from the flame tube 6 are deflected into the heating tube body 5 and the nozzle tube, which in Fig. 5 is shown by flow arrows 21.
  • the thermally insulated portion 15 is formed as a plug, which is inserted into the heating tube body 5 in the form of a jacket jet pipe.
  • the spacer is made of the same material as the thermally insulated portion 15 and the plug and is integrally connected thereto.
  • the spacer and the thermally insulated portion 15 thus form a structural unit.
  • the thermally insulated portion 15 is preferably formed plug-shaped with integrated spacer and can be inserted for mounting in a simple manner in the Schurohr stresses 5 in the form of a jacket jet.
  • the assembly consisting of the thermally insulated portion 15 and the spacer 19 made of a ceramic pourable material, so that the assembly can be produced in a mold.
  • Fig. 6 to 8 show a schematic representation of embodiments of the spacer 19 from Fig. 5 in cross section.
  • the thermally insulated portion 5 is in the Fig. 6 to 8 not shown.
  • the spacer 19 has a plurality of ribs 20, between which the combustion exhaust gases from the flame tube 6 are deflected into the heating tube body 5 and the jacket jet tube.
  • the ribs 20 extend as viewed in the axial direction of the flame tube 6, from the center of the cylinder 6 of the flame tube in the radial direction.
  • the cross section of the spacer is cross-shaped in the embodiment.
  • the cross section may be T-shaped or Y-shaped.
  • Such cross sections are stable, have a long service life and can be relatively easily produced as part of a thermally insulated section in the form of a plug, especially in the casting process.
  • any other cross-sectional shapes of the spacer 19 are possible, it being necessary to ensure that the combustion exhaust gases are diverted from the flame tube 6 into the heating tube body 5.
  • the spacer 19, the ribs 20, viewed in the axial direction of the flame tube 6, extending from the axial center of the flame tube 6 in the radial direction, can also be used in Strahlungssammlungrohren in which the heating tube body 5 is made of ceramic.
  • spacer 19 is also possible with Strahlungssammlungrohren that are not operated horizontally.
  • a horizontal operation of the radiant heating tube is also understood to mean operation of the radiant heating tube in any inclined position.
  • the radiant heating tube can be designed, for example, as a P-radiant heating tube, U-radiant heating tube or as a W radiant heating tube.
  • the holder 16 may be configured as desired.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)
EP18174023.4A 2017-06-02 2018-05-24 Tuyau chauffant par rayonnement à fonctionnement horizontal dans une chambre de four d'un four industriel Withdrawn EP3410009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202017103336.8U DE202017103336U1 (de) 2017-06-02 2017-06-02 Strahlungsheizrohr zum waagerechten Betrieb in einem Ofenraum eines Industrieofens
DE102018107192.2A DE102018107192A1 (de) 2017-06-02 2018-03-26 Strahlungsheizrohr zum waagerechten Betrieb in einem Ofenraum eines Industrieofens

Publications (1)

Publication Number Publication Date
EP3410009A1 true EP3410009A1 (fr) 2018-12-05

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Application Number Title Priority Date Filing Date
EP18174023.4A Withdrawn EP3410009A1 (fr) 2017-06-02 2018-05-24 Tuyau chauffant par rayonnement à fonctionnement horizontal dans une chambre de four d'un four industriel

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Country Link
EP (1) EP3410009A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225757A (en) * 1962-11-09 1965-12-28 Hazen Engineering Company Radiant tube heaters
DE1751858A1 (de) * 1968-08-08 1970-07-30 Annawerk Gmbh Keramische Betr Mantelstrahlheizrohr
DE1808223A1 (de) * 1968-08-08 1970-10-15 Annawerk Gmbh Keramische Betr Mantelstrahl-Heizrohr
EP2754958A1 (fr) 2013-01-10 2014-07-16 LOI Thermprocess GmbH Tube de chauffage radiant
US9303880B1 (en) * 2012-04-10 2016-04-05 L.B. White Company, Inc. Radiant tube heater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3225757A (en) * 1962-11-09 1965-12-28 Hazen Engineering Company Radiant tube heaters
DE1751858A1 (de) * 1968-08-08 1970-07-30 Annawerk Gmbh Keramische Betr Mantelstrahlheizrohr
DE1808223A1 (de) * 1968-08-08 1970-10-15 Annawerk Gmbh Keramische Betr Mantelstrahl-Heizrohr
US9303880B1 (en) * 2012-04-10 2016-04-05 L.B. White Company, Inc. Radiant tube heater
EP2754958A1 (fr) 2013-01-10 2014-07-16 LOI Thermprocess GmbH Tube de chauffage radiant

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