EP3332203B1 - Radiant tube with corrugated radiant tube back support - Google Patents

Radiant tube with corrugated radiant tube back support Download PDF

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Publication number
EP3332203B1
EP3332203B1 EP16745695.3A EP16745695A EP3332203B1 EP 3332203 B1 EP3332203 B1 EP 3332203B1 EP 16745695 A EP16745695 A EP 16745695A EP 3332203 B1 EP3332203 B1 EP 3332203B1
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EP
European Patent Office
Prior art keywords
radiant tube
back support
furnace
tube back
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
EP16745695.3A
Other languages
German (de)
French (fr)
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EP3332203A1 (en
Inventor
Daniele BETTONAGLI
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.)
Nicro SpA
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Nicro SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0045—Radiant burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D2099/0061—Indirect heating

Definitions

  • the present invention relates to a radiant tube with corrugated radiant tube back support.
  • Furnaces for heat-treating sheets and other products made of steel and other materials comprising, for example, a variably shaped radiant tube, e.g. shaped as a "P", "S”, “I”, “double P", “M” or "double U".
  • Said radiant tube is supported by the furnace walls, on one side by an attachment flange and on the other by a radiant tube back support which rests on a surface of a furnace socket fixed to the furnace wall.
  • WO-2011/044599 describes a radiant tube with a radiant tube back support resting on a surface of a furnace socket fixed to the wall of a furnace by means of a replaceable sliding plane.
  • US-4520789 shows a radiant tube with a flange having a cavity slidingly associated with a tubular arm fixed to the furnace wall.
  • said tubular arm is coated with a thermal insulating material.
  • WO-2014072839 describes a radiant tube with a radiant tube back support provided with anti-sticking means, such as rolling means, or a coating comprising a low-friction material, or a carbon tungsten or zirconium based thermally treated material, or any other material having a given roughness, or a hardening material.
  • JP-8327263 describes a low-friction coefficient coating to be applied to the portions of a heat exchanger in contact with the support walls of a furnace so as to prevent sticking phenomena.
  • US-7678465 describes an anti-sticking coating comprising zirconium oxide, for steel subject to high temperatures.
  • WO-99/14400 describes a heat exchanger comprising a protective coating which envisages zirconium.
  • WO-2014072839 also discloses a corrugation or bellow or compensator adapted to absorb at least part of the thrust of a radiant tube on a radiant tube support in case of sticking thereof with the furnace side wall support, allowing the radiant tube to be subjected to expansion, like a sort of "bellow” regardless of the adherence, over a given distance without damaging the radiant tube.
  • a radiant tube for furnaces for heat-treating sheets and other products made of steel or other material comprising at least one conduit supported by a flange fixed to a lateral wall of the furnace which allows the inlet and the outlet of heating hot fluid into/from the radiant tube, and at least one radiant tube back support suitable to rest on a surface of a furnace socket fixed to another wall of the furnace, characterized in that said radiant tube back support is tubular and has an outer surface comprising an alternating series of protrusions and recesses in sequence along the direction of a sliding axis of said radiant tube back support orthogonal to said wall of the furnace, so that the radiant tube back support rests on the surface of the furnace socket only at peak points of the protrusions.
  • a radiant tube 1 for furnaces for heat-treating sheets and other products made of steel or other material has a "double P" shape envisaging a central conduit 2 in communication with two lateral conduits 3 by means of two fittings 4, 5 ( figures 1-3 ).
  • the first fitting 4 is placed at a first end of the radiant tube 1 and is fixed to a lateral wall (not shown in the figures) of the furnace by means of a flange 6 which lets the hot heating fluid in/out from the radiant tube 1.
  • the radiant tube back support 7 has a corrugated outer surface 71, i.e. which was subjected to an operation of corrugation.
  • Said outer surface 71 has an alternating series of protrusions 72 and recesses 73 in sequence along the direction of a sliding axis L of said radiant tube back support 7, said axis L coinciding with the axis of the tubular radiant tube back support 7 and being orthogonal with respect to said lateral wall of the furnace.
  • said axis L represents the prevalent sliding direction of the radiant tube back support 7 on the surface 81 of the furnace socket 8, the radiant tube back support 7 being able to slide along further directions, although these are, in all cases, secondary with respect to that of axis L.
  • the corrugation pitch i.e. the distance between two consecutive protrusions 72 or two consecutive recesses 73
  • the depth of the recesses 73 is either greater than or equal to 1 mm, preferably comprised between 2.5 mm and 3.5 mm.
  • the corrugation pitch (distance between two consecutive protrusions 72 or two consecutive recesses 73) is about 40 mm, and the depth of the recesses 73 (distance between the peak 721 of a protrusion 72 and the bottom 731 of a recess 73) is about 3 mm.
  • the length of the radiant tube back support 7 is comprised between 250 mm and 350 mm.
  • the radiant tube back support 7 about 300 mm long.
  • the depth of the recesses 73 which must be either greater than or equal to 1 mm to allow the radiant tube back support 7 to rest on the surface 81 of the furnace socket 8 only at the peak points 721 of the protrusions 72: consequently, the contact is punctiform, thus avoiding sticking phenomena.
  • the presence of the alternating series of protrusions 72 and recesses 73 means that the radiant tube back support 7 may slide, without sticking, on said surface 81 of the furnace socket 8, and in particular that said radiant tube back support 7 can slide prevalently along the direction of the sliding axis L. A shallower depth would not prevent the sticking at very high temperatures.
  • the depth of the recesses makes it possible to have a sufficient space to contain possible slag inside the furnace.
  • the radiant tube back support 7 envisages through holes 75 to allow the release of possible overheating which could otherwise be generated in a closed chamber; preferably, the radiant tube back support 7 comprises four through holes 75 at 90°.
  • the radiant tube back support 7 does not have any coating: it is only corrugated during the step of manufacturing of the radiant tube 1.
  • the radiant tube back support 7 In order to limit the overheating of the radiant tube back support 7, it can be coated with a thermal insulating substance which comprises zirconium oxide (in percentage by weight higher than 90%) and yttrium oxide (in percentage by weight lower than 10%).
  • a thermal insulating substance which comprises zirconium oxide (in percentage by weight higher than 90%) and yttrium oxide (in percentage by weight lower than 10%).
  • Said substance creates a thermal barrier between the radiant tube back support 7 and the surface 81 of the furnace socket 8.
  • said substance comprises ZrO 2 at 92% by weight and Y 2 O 3 at 8% by weight.
  • said substance has a porosity percentage (by weight) comprised between 10 and 15, a micro-hardness (HV 300 ) comprised between 500 and 600, a binding capacity higher than 8 MPa and confers a roughness (Ra) comprised between 7 and 8 ⁇ m to the sprayed surface.
  • said substance increases the corrosion resistance of the radiant tube back support 7 at high temperatures.
  • FIGS 6-10 show further embodiments of the radiant tube 1 according to the invention, shaped as a "P", “S”, “I”, “M” and “double U”, with one or more radiant tube back supports 7 as described in the claims.
  • the radiant tube back support 7 may have a different shape: it may have a non-circular section, e.g. a square or triangular section, or be flat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)

Description

  • The present invention relates to a radiant tube with corrugated radiant tube back support.
  • Furnaces for heat-treating sheets and other products made of steel and other materials are known, comprising, for example, a variably shaped radiant tube, e.g. shaped as a "P", "S", "I", "double P", "M" or "double U".
  • Said radiant tube is supported by the furnace walls, on one side by an attachment flange and on the other by a radiant tube back support which rests on a surface of a furnace socket fixed to the furnace wall.
  • The interaction between the radiant tube back support and the surface of the furnace socket makes it possible to compensate for movements of the radiant tube caused by temperature variations.
  • The high temperatures which are reached by the furnace, as average between 700°C and 1200°C, determine a problem of adhesion of the radiant tube back support to said surface, with consequent "sticking" of the radiant tube, which thus breaks.
  • WO-2011/044599 describes a radiant tube with a radiant tube back support resting on a surface of a furnace socket fixed to the wall of a furnace by means of a replaceable sliding plane.
  • US-4520789 shows a radiant tube with a flange having a cavity slidingly associated with a tubular arm fixed to the furnace wall. In order to limit the overheating, said tubular arm is coated with a thermal insulating material.
  • WO-2014072839 describes a radiant tube with a radiant tube back support provided with anti-sticking means, such as rolling means, or a coating comprising a low-friction material, or a carbon tungsten or zirconium based thermally treated material, or any other material having a given roughness, or a hardening material.
  • JP-8327263 describes a low-friction coefficient coating to be applied to the portions of a heat exchanger in contact with the support walls of a furnace so as to prevent sticking phenomena.
  • US-7678465 describes an anti-sticking coating comprising zirconium oxide, for steel subject to high temperatures.
  • WO-99/14400 describes a heat exchanger comprising a protective coating which envisages zirconium.
  • Disadvantageously, the sliding plane described in WO-2011/044599 is subject to wear and therefore must be replaced with consequent stopping of the furnace which must be cooled down and then heated again. A similar problem relates to the rolling means described in WO-2014072839 .
  • WO-2014072839 also discloses a corrugation or bellow or compensator adapted to absorb at least part of the thrust of a radiant tube on a radiant tube support in case of sticking thereof with the furnace side wall support, allowing the radiant tube to be subjected to expansion, like a sort of "bellow" regardless of the adherence, over a given distance without damaging the radiant tube.
  • In the other, wide use is made of radiant tube back support coatings, which in all cases imply a supplementary work of application on the radiant tube back support and a further research expense for finding the right coating, which is, in all cases, subject to wear after a given number of working cycles.
  • It is the object of the present invention to make a radiant tube for furnaces for heat-treating sheets and other products made of steel or other material, with a radiant tube back support which does not stick to the surface of the furnace socket fixed to the wall of the furnace, which is simple to make, not subject to wear and which makes it possible to obtain long working cycles without needing to extinguish the furnace.
  • According to the invention, such an object is reached by a radiant tube for furnaces for heat-treating sheets and other products made of steel or other material, comprising at least one conduit supported by a flange fixed to a lateral wall of the furnace which allows the inlet and the outlet of heating hot fluid into/from the radiant tube, and at least one radiant tube back support suitable to rest on a surface of a furnace socket fixed to another wall of the furnace,
    characterized in that said radiant tube back support is tubular and has an outer surface comprising an alternating series of protrusions and recesses in sequence along the direction of a sliding axis of said radiant tube back support orthogonal to said wall of the furnace, so that the radiant tube back support rests on the surface of the furnace socket only at peak points of the protrusions.
  • These and other features of the present invention will be further apparent from the following detailed description of its embodiments thereof, shown by way of non-limitative example in the accompanying drawings, in which:
    • figure 1 shows in a top plan view of a "double P" radiant tube with a partially sectioned radiant tube back support;
    • figure 2 shows a side view of the radiant tube in figure 1;
    • figure 3 is a frontal view of the radiant tube in figure 1;
    • figure 4 shows an enlarged section view of the radiant tube back support taken along the line IV-IV in figure 3, with a cavity of a support fixed to a wall of a furnace;
    • figure 5 shows a section view taken along the line V-V in figure 4;
    • figure 6 shows a top plan view of an "S" shaped radiant tube;
    • figure 7 shows a top plan view of an "I" shaped radiant tube;
    • figure 8 shows a top plan view of a "P" shaped radiant tube;
    • figure 9 shows a top plan view of an "M" shaped radiant tube;
    • figure 10 shows a top plan view of a "double U" shaped radiant tube".
  • A radiant tube 1 for furnaces for heat-treating sheets and other products made of steel or other material has a "double P" shape envisaging a central conduit 2 in communication with two lateral conduits 3 by means of two fittings 4, 5 (figures 1-3).
  • The first fitting 4 is placed at a first end of the radiant tube 1 and is fixed to a lateral wall (not shown in the figures) of the furnace by means of a flange 6 which lets the hot heating fluid in/out from the radiant tube 1.
  • A tubular radiant tube back support 7, suitable to rest on a surface 81 of a furnace socket 8 fixed to a second lateral wall of the furnace, is externally fixed at the second fitting 5 (figure 4).
  • The radiant tube back support 7 has a corrugated outer surface 71, i.e. which was subjected to an operation of corrugation.
  • Said outer surface 71 has an alternating series of protrusions 72 and recesses 73 in sequence along the direction of a sliding axis L of said radiant tube back support 7, said axis L coinciding with the axis of the tubular radiant tube back support 7 and being orthogonal with respect to said lateral wall of the furnace. Particularly, said axis L represents the prevalent sliding direction of the radiant tube back support 7 on the surface 81 of the furnace socket 8, the radiant tube back support 7 being able to slide along further directions, although these are, in all cases, secondary with respect to that of axis L.
  • Preferably, the corrugation pitch (i.e. the distance between two consecutive protrusions 72 or two consecutive recesses 73) is comprised between 35 mm and 45 mm, and the depth of the recesses 73 (distance between the peak 721 of a protrusion 72 and the bottom 731 of a recess 73) is either greater than or equal to 1 mm, preferably comprised between 2.5 mm and 3.5 mm.
  • Even more preferably, the corrugation pitch (distance between two consecutive protrusions 72 or two consecutive recesses 73) is about 40 mm, and the depth of the recesses 73 (distance between the peak 721 of a protrusion 72 and the bottom 731 of a recess 73) is about 3 mm.
  • Preferably, the length of the radiant tube back support 7 is comprised between 250 mm and 350 mm.
  • Even more preferably, the radiant tube back support 7 about 300 mm long.
  • Fundamentally important is the depth of the recesses 73, which must be either greater than or equal to 1 mm to allow the radiant tube back support 7 to rest on the surface 81 of the furnace socket 8 only at the peak points 721 of the protrusions 72: consequently, the contact is punctiform, thus avoiding sticking phenomena. The presence of the alternating series of protrusions 72 and recesses 73 means that the radiant tube back support 7 may slide, without sticking, on said surface 81 of the furnace socket 8, and in particular that said radiant tube back support 7 can slide prevalently along the direction of the sliding axis L. A shallower depth would not prevent the sticking at very high temperatures.
  • Advantageously, the depth of the recesses makes it possible to have a sufficient space to contain possible slag inside the furnace. Furthermore, the radiant tube back support 7 envisages through holes 75 to allow the release of possible overheating which could otherwise be generated in a closed chamber; preferably, the radiant tube back support 7 comprises four through holes 75 at 90°.
  • In the embodiment shown above, the radiant tube back support 7 does not have any coating: it is only corrugated during the step of manufacturing of the radiant tube 1.
  • In order to limit the overheating of the radiant tube back support 7, it can be coated with a thermal insulating substance which comprises zirconium oxide (in percentage by weight higher than 90%) and yttrium oxide (in percentage by weight lower than 10%).
  • Said substance creates a thermal barrier between the radiant tube back support 7 and the surface 81 of the furnace socket 8.
  • In an embodiment, said substance comprises ZrO2 at 92% by weight and Y2O3 at 8% by weight.
  • Advantageously, said substance has a porosity percentage (by weight) comprised between 10 and 15, a micro-hardness (HV300) comprised between 500 and 600, a binding capacity higher than 8 MPa and confers a roughness (Ra) comprised between 7 and 8 µm to the sprayed surface.
  • Furthermore, said substance increases the corrosion resistance of the radiant tube back support 7 at high temperatures.
  • Two reinforcing flaps 10, mounted obliquely with respect to the axis of the radiant tube back support 7, are provided in order to improve the solidity of the radiant tube back support 7.
  • Figures 6-10 show further embodiments of the radiant tube 1 according to the invention, shaped as a "P", "S", "I", "M" and "double U", with one or more radiant tube back supports 7 as described in the claims.
  • The radiant tube back support 7 may have a different shape: it may have a non-circular section, e.g. a square or triangular section, or be flat.

Claims (9)

  1. A radiant tube (1) for furnaces for heat-treating sheets and other products made of steel or other material, comprising at least one conduit (2) supported by a flange (6) fixed to a lateral wall of the furnace which allows the inlet and the outlet of heating hot fluid into/from the radiant tube (1), and by at least one radiant tube back support (7) suitable to rest on a surface (81) of a furnace socket (8) fixed to another wall of the furnace,
    characterized in that said radiant tube back support (7) is tubular and has an outer surface (71) comprising an alternating series of protrusions (72) and recesses (73) in sequence along the direction of a sliding axis (L) of said radiant tube back support (7) which is orthogonal to said wall of the furnace, so that the radiant tube back support (7) rests on the surface (81) of the furnace socket (8) only at peak points (721) of the protrusions (72).
  2. A radiant tube (1) according to claim 1, characterized in that the depth of the recesses (73) is either greater than or equal to 1 mm.
  3. A radiant tube (1) according to any of the preceding claims, characterized in that the radiant tube back support (7) is coated by a thermal insulating substance suitable for breaking the thermal bridge, which comprises zirconium oxide and yttrium oxide.
  4. A radiant tube (1) according to claim 3, characterized in that the zirconium oxide is in percentage by weight greater than 90% and the yttrium oxide is in percentage by weight lower than 10%.
  5. A radiant tube (1) according to claim 4, characterized in that said substance comprises ZrO2 at 92% by weight and Y2O3 at 8% by weight.
  6. A radiant tube (1) according to any of the preceding claims, characterized in that it is provided with two reinforcing flaps (10) for the radiant tube back support (7), obliquely mounted with respect to the axis of the radiant tube back support (7).
  7. A radiant tube (1) according to any of the preceding claims, characterized in that it comprises a central conduit (2) communicating with two lateral conduits (3) by means of two fittings (4, 5), said radiant tube back support (7) being provided at one fitting (5).
  8. A radiant tube (1) according to any of claims 1-6, characterized in that it is alternatively shaped as a "P", "S", "I", "M" and "double U".
  9. A radiant tube (1) according to any of the preceding claims, characterized in that said radiant tube back support (7) is provided with through holes (75) for circulating gas inside the radiant tube back support (7) itself.
EP16745695.3A 2015-08-07 2016-07-27 Radiant tube with corrugated radiant tube back support Active EP3332203B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A002984A ITUB20152984A1 (en) 2015-08-07 2015-08-07 Radiant tube with corrugated shank.
PCT/EP2016/067939 WO2017025333A1 (en) 2015-08-07 2016-07-27 Radiant tube with corrugated radiant tube back support

Publications (2)

Publication Number Publication Date
EP3332203A1 EP3332203A1 (en) 2018-06-13
EP3332203B1 true EP3332203B1 (en) 2020-03-04

Family

ID=54477161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16745695.3A Active EP3332203B1 (en) 2015-08-07 2016-07-27 Radiant tube with corrugated radiant tube back support

Country Status (5)

Country Link
EP (1) EP3332203B1 (en)
CN (1) CN108027213A (en)
ES (1) ES2792987T3 (en)
IT (1) ITUB20152984A1 (en)
WO (1) WO2017025333A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800006668A1 (en) * 2018-06-26 2019-12-26 Massimiliano Bisson SUPPORT DEVICE FOR RADIANT TUBES
US11524136B2 (en) * 2018-12-24 2022-12-13 Biosense Webster (Israel) Ltd. Non-invasive measurement of the pitch of a braid

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08278001A (en) * 1995-04-04 1996-10-22 Nippon Steel Corp Mounting structure of radiant tube
JP3549981B2 (en) * 1996-05-08 2004-08-04 新日本製鐵株式会社 Furnace support structure of radiant tube with alternating heat storage
JP3855369B2 (en) * 1997-05-26 2006-12-06 Ｊｆｅスチール株式会社 Radiant tube support device
JP3327204B2 (en) * 1998-03-10 2002-09-24 住友金属工業株式会社 Radiant tube support structure
KR20050017781A (en) * 2003-08-08 2005-02-23 주식회사 케너텍 Radiant tube support in furnace
JP2005241144A (en) * 2004-02-26 2005-09-08 Jfe Steel Kk Radiant tube type heating device
DE202008009065U1 (en) * 2008-07-04 2008-10-09 WS Wärmeprozesstechnik GmbH Radiant heating arrangement with delay compensation
KR101025615B1 (en) * 2009-06-18 2011-03-30 주식회사 세창엔지니어링 Radiant tube
AT508368B1 (en) * 2009-10-13 2011-01-15 Ebner Ind Ofenbau DEVICE FOR HEAT TREATMENT OF TAPE BANDS
CN101724744B (en) * 2009-12-18 2011-07-06 孙立彬 Double-P type radiant tube and manufacture method thereof
US10011887B2 (en) * 2013-01-02 2018-07-03 Massimiliano Bisson Support device for radiant tubes

Also Published As

Publication number Publication date
WO2017025333A1 (en) 2017-02-16
ES2792987T3 (en) 2020-11-12
CN108027213A (en) 2018-05-11
EP3332203A1 (en) 2018-06-13
ITUB20152984A1 (en) 2017-02-07

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