EP1561825A1 - Procédé pour la fabrication d'un turbulateur - Google Patents

Procédé pour la fabrication d'un turbulateur Download PDF

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Publication number
EP1561825A1
EP1561825A1 EP04100381A EP04100381A EP1561825A1 EP 1561825 A1 EP1561825 A1 EP 1561825A1 EP 04100381 A EP04100381 A EP 04100381A EP 04100381 A EP04100381 A EP 04100381A EP 1561825 A1 EP1561825 A1 EP 1561825A1
Authority
EP
European Patent Office
Prior art keywords
sheet
vane
cylindrical body
incision
essentially cylindrical
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Withdrawn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
EP04100381A
Other languages
German (de)
English (en)
Inventor
Robert Schmeler
Guy Thillen
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Priority to EP04100381A priority Critical patent/EP1561825A1/fr
Priority to DE112005000165T priority patent/DE112005000165T5/de
Priority to PCT/EP2005/050368 priority patent/WO2005075689A1/fr
Publication of EP1561825A1 publication Critical patent/EP1561825A1/fr
Withdrawn legal-status Critical Current

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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
    • F27D9/00—Cooling of furnaces or of charges therein
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/24—Cooling arrangements

Definitions

  • the present invention relates to a method for manufacturing a turbulator and a turbulator manufactured with this method.
  • the turbulator can be used for swirling a cooling medium in a blast furnace cooling system, in particular in connection with cooling staves of such a system.
  • Heat exchange applications employ at least one flowing medium, liquid or gaseous or a mixture of both flowing through a conduit.
  • Efficiency of thermal transfer depends partly on relative velocity of the medium.
  • One way of improving efficiency is to increase axial velocity of the medium. In order to increase axial velocity, the discharge rate of the medium must be increased, which is generally not desired.
  • Another way of improving efficiency is to add a transversal velocity component to the medium. Due to such a transversal velocity component the flow velocity of the medium is increased near the walls of the conduit, whereby the heat transfer is improved. By optimizing the transversal velocity, considering the required heat transfer, the total discharge rate of the medium can be reduced considerably.
  • Turbulators are commonly used as passive elements in such heat exchange applications to add or increase a transversal velocity component of a medium, or in other words to curl or swirl the medium so as to benefit from aforementioned increase in efficiency.
  • US-B-6 530 422 discloses a conduit for petrochemical applications with a swirl creating, helical baffle directly connected to, and cast together with the conduit by precision casting. It is clear that this manufacturing process is both complex and expensive. A cheaper alternative is to form a turbulator from a flat sheet to be subsequently inserted into a conduit.
  • EP-B-0 181 711 discloses a turbulator for waste gases made from a single flat sheet, which is slitted and has tabs bent to a generally right angle with flow direction and is helically twisted before it is longitudinally inserted into a conduit.
  • FR-A-2 211 111 discloses a turbulator made from a single flat sheet, having tabs bent out of the sheet and inserted longitudinally into a conduit.
  • the object of the present invention is to provide a simplified method for manufacturing a turbulator. This object is achieved by a method as claimed in claim 1 and a turbulator as claimed in claim 17.
  • the present invention proposes a method for manufacturing a turbulator, in particular for swirling a cooling medium in a blast furnace cooling system.
  • the method comprises the steps of providing a flat sheet having an upper surface and an opposite lower surface, a downstream edge and an opposite upstream edge, a first side edge and an opposite second side edge; making at least one incision in the sheet; transforming, e.g. through bending or folding, part of the sheet at the incision so as to form a vane on the upper surface of the sheet.
  • the method comprises the further step of transforming the sheet into an essentially cylindrical body by bringing the first side edge in proximity to the second side edge.
  • This method provides an simplified fast and cheap way of producing turbulators having an essentially cylindrical body.
  • the vanes can be arranged so as to impart a swirling motion to the medium, without having an excessive flow restriction or resistance.
  • the incision is such as to describe an open contour on the sheet, the open contour being complemented by a base line so as to define a vane area.
  • the base line provides a connection between the vane area and the sheet.
  • the base line of the vane area can be directed towards the upstream edge of the sheet.
  • base line of the vane area can be directed towards one of the side edges of the sheet.
  • the incision extends from the downstream edge into the flat sheet and in a direction generally towards the upstream edge.
  • the incision can be perpendicular to the downstream edge. Providing an incision from the downstream edge of the flat sheet is particularly easy and quick, thereby further simplyifing the method. It is however not excluded to provide the incision in other parts of the sheet.
  • the vane is formed by bending the vane area out of the surface of the sheet.
  • a plurality of vanes are preferably provided in the flat sheet so as to improve the turbulation of the medium.
  • the vane can have a first free corner and a second free corner, the first free corner being moved further away from its original position than the second free corner.
  • Such a vane has a surface imparting, on its own, a swirling motion to the medium.
  • the base line of the vane can be arranged at an angle with respect to the direction of flow of the medium, thereby imparting a swirling motion to the medium.
  • the latter can be offset in a direction of flow in order to impart a swirling motion to the medium.
  • the flat sheet is transformed into an essentially cylindrical body so as to arrange the vanes inside the essentially cylindrical body.
  • the vanes provide a restriction to the flow of a medium through the essentially cylindrical body, thereby imparting a swirling motion to the medium. It will be appreciated that it is also possible to arrange the vanes outside the essentially cylindrical body, e.g. if the medium flows through an essentially annular conduit having a central core.
  • the flat sheet can be made of metal or plastic material.
  • the material should be chosen depending on the intended use.
  • the material can e.g. be steel, preferably stainless steel, or copper. Any other suitable material which has the properties of being resistant to thermal fatigue, corrosion resistant, machineable, thermally conductive and of sufficient strength can also be used.
  • the essentially cylindrical body is preferably inserted into a conduit and forms a turbulator therein. Any medium flowing through the conduit is turbulated as it hits the vanes of the essentially cylindrical body.
  • the essentially cylindrical body is fixed in the conduit by deformation of the conduit in the region of the essentially cylindrical body.
  • the conduit can e.g. be deformed by making a recess on an outer surface of the conduit, thereby deforming an inner surface of the conduit. Such a recess can change the inner cross-section of the conduit, thereby preventing the cylindrical body from being displaced or dislodged.
  • the conduit can also be deformed by bending of the conduit in the region comprising the essentially cylindrical body. If the direction of the axis of the conduit is changed, the essentially cylindrical body is prevented from being displaced or dislodged.
  • the essentially cylindrical body can also be fixed in the conduit by resilience of the sheet.
  • the flat sheet can have a resilience, which, once the sheet has been deformed into a cylindrical body, urges the sheet back into its original form. When confined in a conduit, the sheet then pushes against the inner wall of the conduit and is thereby locked in place. It will be understood that this only works if the first and second side edges are not fixedly connected, e.g. through welding.
  • the present invention also relates to a turbulator, in particular for swirling a cooling medium in a blast furnace cooling system, comprising an essentially cylindrical body formed from a flat sheet and at least one vane protruding from a surface of the sheet, the vane being formed by making an incision in the sheet and bending the sheet at the incision.
  • essentially cylindrical body is, although preferred, not limited to a circular cross-section.
  • Fig.1 shows the steps for manufacturing a turbulator according to a first embodiment of the invention.
  • a flat, generally rectangular sheet 10 is provided.
  • This sheet 10 has an upper surface 12, an opposite lower surface 14, a downstream edge 16 and an opposite upstream edge 18, a first side edge 20 and an opposite second side edge 22.
  • the sheet 10 is made from steel, preferably stainless steel, or copper. Any other suitable material, such as e.g. plastic material, which has the properties of being resistant to thermal fatigue, corrosion resistant, machineable, thermally conductive and of sufficient strength can be used.
  • the flat sheet 10 is provided with incisions 24, 24', 24", e.g. by means of cutting or punching.
  • these incisions 24, 24', 24" are essentially straight, perpendicular to and starting at the downstream edge 16 of the sheet 10.
  • the incisions 24, 24', 24" are such as to describe open contours on the sheet 10, which are complemented by base lines 26, 26', 26" 26"' so as to form vane areas 28, 28', 28", 28"' in the sheet 10.
  • the vane areas 28, 28', 28", 28"' are then transformed, generally by bending, into vanes 30, 30', 30", 30"'. This can be achieved e.g. by bending upwards (with respect to upper surface 12 and lower surface 14), only one corner of the vane areas 28, 28', 28", 28"'.
  • the thickness of the sheet 10 is chosen such that the vanes 30, 30', 30", 30"' resist operational stress of the turbulator without being deformed.
  • the flat sheet 10 is shown with all of the vane areas 28, 28', 28", 28"' transformed into vanes 30, 30', 30", 30"'.
  • the sheet 10 is then transformed, e.g. by bending or coiling, as shown by arrow 32, into a generally cylindrical body, wherein the first side edge 20 and the second side edge 22 meet.
  • first side edge 20 can be welded to the second side edge 22.
  • Fig.2 and Fig.3 show a conduit 34 with the turbulator having a generally cylindrical body 36 arranged therein.
  • the vanes 30, 30', 30", 30"' of the generally cylindrical body 36 can also be seen.
  • the conduit 34 can be a tube in a heat exchange application, e.g. in a blast furnace cooling system.
  • the conduit 34 can be a tube arranged in a cooling stave.
  • Fig.4 shows the steps for manufacturing a turbulator according to a second embodiment of the invention.
  • the flat sheet 10 is provided with incisions 24, 24', 24", e.g. by means of cutting or punching.
  • these incisions 24, 24', 24" are essentially U-shaped and describe open contours on the sheet 10, which are complemented by base lines 26, 26', 26" so as to form vane areas 28, 28', 28" in the sheet 10.
  • the vane areas 28, 28', 28" are then transformed, generally by bending, into vanes 30, 30', 30".
  • the base lines 26, 26', 26" are arranged at an angle.
  • the incisions 24, 24', 24" are offset in a direction of flow of the medium.
  • Fig.5 shows the steps for manufacturing a turbulator according to a third embodiment of the invention.
  • the flat sheet 10 is provided with incisions 24, 24', 24", e.g. by means of cutting or punching.
  • these incisions 24, 24', 24" are essentially trapezium-shaped and describe open contours on the sheet 10, which are complemented by base lines 26, 26', 26" so as to form vane areas 28, 28', 28" in the sheet 10.
  • the base lines 26, 26', 26" are the longer base of the trapezium.
  • the vane areas 28, 28', 28" are then transformed, generally by bending, into vanes 30, 30', 30".
  • the base lines 26, 26', 26" are arranged at an angle.
EP04100381A 2004-02-03 2004-02-03 Procédé pour la fabrication d'un turbulateur Withdrawn EP1561825A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04100381A EP1561825A1 (fr) 2004-02-03 2004-02-03 Procédé pour la fabrication d'un turbulateur
DE112005000165T DE112005000165T5 (de) 2004-02-03 2005-01-28 Verfahren zum Befestigen eines Tubulatoreinsatzes in einer Leitung
PCT/EP2005/050368 WO2005075689A1 (fr) 2004-02-03 2005-01-28 Procede de fixation de piece de turbulateur a l'interieur d'un conduit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04100381A EP1561825A1 (fr) 2004-02-03 2004-02-03 Procédé pour la fabrication d'un turbulateur

Publications (1)

Publication Number Publication Date
EP1561825A1 true EP1561825A1 (fr) 2005-08-10

Family

ID=34673719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04100381A Withdrawn EP1561825A1 (fr) 2004-02-03 2004-02-03 Procédé pour la fabrication d'un turbulateur

Country Status (1)

Country Link
EP (1) EP1561825A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE312989C (fr) *
DE1126431B (de) * 1959-06-19 1962-03-29 Laengerer & Reich Kuehler Kuehlerrohreinsatz
US4727907A (en) * 1987-03-30 1988-03-01 Dunham-Bush Turbulator with integral flow deflector tabs
FR2659730A1 (fr) * 1990-03-19 1991-09-20 Muller Cie Turbulateur notamment pour chaudiere a gaz.
EP0567399A1 (fr) * 1992-04-21 1993-10-27 Valeo Thermique Moteur Tube d'échangeur de chaleur à dispositif perturbateur intégré
US20030188850A1 (en) * 2002-04-09 2003-10-09 Honeywell International Inc., Tubular catalytic aircraft precooler

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE312989C (fr) *
DE1126431B (de) * 1959-06-19 1962-03-29 Laengerer & Reich Kuehler Kuehlerrohreinsatz
US4727907A (en) * 1987-03-30 1988-03-01 Dunham-Bush Turbulator with integral flow deflector tabs
FR2659730A1 (fr) * 1990-03-19 1991-09-20 Muller Cie Turbulateur notamment pour chaudiere a gaz.
EP0567399A1 (fr) * 1992-04-21 1993-10-27 Valeo Thermique Moteur Tube d'échangeur de chaleur à dispositif perturbateur intégré
US20030188850A1 (en) * 2002-04-09 2003-10-09 Honeywell International Inc., Tubular catalytic aircraft precooler

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