EP1144934B1 - Benutzung eines starren, schraubenförmigen Elements in Verbindung mit einem Wärmetauscherrohr - Google Patents

Benutzung eines starren, schraubenförmigen Elements in Verbindung mit einem Wärmetauscherrohr Download PDF

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Publication number
EP1144934B1
EP1144934B1 EP99961127A EP99961127A EP1144934B1 EP 1144934 B1 EP1144934 B1 EP 1144934B1 EP 99961127 A EP99961127 A EP 99961127A EP 99961127 A EP99961127 A EP 99961127A EP 1144934 B1 EP1144934 B1 EP 1144934B1
Authority
EP
European Patent Office
Prior art keywords
tube
rigid
diameter
use according
helicoidal member
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.)
Expired - Lifetime
Application number
EP99961127A
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English (en)
French (fr)
Other versions
EP1144934A1 (de
EP1144934B9 (de
Inventor
Thierry Patureaux
Marie-Andrée Senegas
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.)
TotalEnergies Marketing Services SA
Original Assignee
TotalFinaElf France SA
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Publication date
Application filed by TotalFinaElf France SA filed Critical TotalFinaElf France SA
Publication of EP1144934A1 publication Critical patent/EP1144934A1/de
Application granted granted Critical
Publication of EP1144934B1 publication Critical patent/EP1144934B1/de
Publication of EP1144934B9 publication Critical patent/EP1144934B9/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters

Definitions

  • the present invention relates to improvements made to heat exchanger tubes to liquids, to prevent clogging inputs of these tubes by suspended materials in the liquid to circulate in the tubes.
  • Deposits are known to occur in the exchanger tubes from the liquids circulating there and that it is necessary to clean them periodically, to remedy the decline in performance that results from this fouling, after periods of use of several months.
  • WO 81/01839 A discloses an evaporator comprising tubes heated from the outside, for the production of fresh water from salt water. During the use of the evaporator, in order to clean the inside of the tubes, we move inside them helical springs protruding outside these tubes.
  • the subject of the invention is the use, in association with a circular heat exchanger tube in which is called to circulate a liquid, a helical rigid element protruding to the outside of this tube at the entrance to it, with a view to maintaining away from this input the materials carried by the liquid and likely to block this entry, the element rigid helical being integral with the end of the associated tube without use of an auxiliary fastener, characterized in that the rigid helical element is supported by its turns deformed elastically against the face internal or the outer face of the tube.
  • This rigid helical element has the effect not only of oppose the entry into the tube of various suspended materials driven by the liquid, but also to cause turbulence of this fluid at the entrance of the tube, thus avoiding that the materials carried can completely block the entrance of the tube.
  • various systems of flanges forming cages intended to retain the materials conveyed by the fluid see, in particular, US-A-5,509,467, EP-A-132 766, US-A-5,102,537, US-A-2,774,569, US-A-4,590,994, and US-A-1,172,938).
  • the implementation of these devices is however complicated and expensive, as requiring, for example, complex realizations, using complicated and delicate preliminary assemblies.
  • they cause only insufficient turbulence of the liquid upstream of the inlet of the tubes, so that the materials driven by this liquid can come apply firmly against these devices and cause them clogging.
  • EP-A-0 219 882 discloses a heat exchanger in vertical channels which flows a gas fluid.
  • these channels are housed elastic elements such as helical springs or supporting metal wires blades extending radially. These elastic elements protrude at both ends of the tubes and are intended to be vibrated, in order to periodically clean inside the channels, by means of an injection intermittent additional compressed gas. It is not not indicated, in this earlier document, whether the fluid gas flowing normally in the holds may contain materials likely to block the entrance of these. On the other hand, it is specified that under normal use, the elastic elements are not set in motion by the gaseous fluid.
  • EP-A-0 369 851 a method of continuous cleaning of a tube, in particular of a heat exchanger heat, in which a fluid circulates, according to which a helical movable element housed in this tube and hooked to one end of it by a mechanical connection the leaving free to turn on itself along the axis of the tube, is driven in continuous rotation by the fluid.
  • the movable element comprises at least one sharp edge intended
  • the helical rigid element protrudes upstream from the entrance of the tube at a distance of between about 1 and 10 the outer diameter of the associated tube and, preferably, between 2 and 8 times this diameter.
  • the rigid helical element could be held in position at the entrance of the tube by hooking means known in the technical, able to keep it inside or outside the tube following the technology of the exchanger but this use of an organ auxiliary fixation is not within the scope of the invention.
  • such a fastening means can be constituted, for example, in a manner known per se, by a rigid member of U-shaped fastener, known as a "pin" in the art, which is disposed to the outside of the tube, with the ends of the branches of the U close together elastically from each other and engaged in the entrance of the tube, while that the wire wound helically is hooked to the base of the U.
  • a rigid member of U-shaped fastener known as a "pin" in the art
  • the rigid helical element is made integral with the end of the tube at the entrance of which it protrudes to the outside without the aid of any auxiliary fastening device, in taking firm support, by its elastically deformed turns, against the inner face of the tube, as described in FR-A-2 611 879 in another application, or against the outer face of this tube.
  • FR-A-2 611 879 relates, in fact, tubes heat exchanger, in which are arranged in fixed position of obstacles intended to provoke turbulence of the circulating fluid, with a view to improving the thermal exchanges between this fluid and the wall of the tube and to reduce the risk of solid waste deposits on the inner surface of this wall.
  • said "turbulence promoters” or “disruptive flux” consists in arranging the inside of circular section tubes, in a fixed position in contact with their inner wall, a wire, for example metallic, helically wound.
  • a means particularly simple is to use a wire elastically deformable helical profile, the diameter of the turns is normally greater than the diameter inside the tube, to longitudinally stretch this wire for decrease the diameter of its turns, in order to introduce it into the tube, and after having it introduced, to release it so that its turns tend to resume their initial diameter inside the tube, in coming firmly against the inner wall of the latter, without the wire being displaced by the fluid circulated in the tube.
  • the invention therefore proposes to adapt this known technique with a view to obtaining a different result, by having the same way a wire wound helically inside the heat exchanger tube, in the vicinity of the entrance of this tube but with a protruding part outside the tube, in order to oppose the passage of materials carried by the liquid.
  • the rigid helical element can, when the shape of the tubular plate of the heat exchanger, or any other device analogue, makes it possible to have tubes including an outer part of their upstream end is usable, elastically grip this end of the tube along part of its length and protrude into upstream of the tube inlet.
  • the rigid helical element has advantageously turns of diameter normally less than outer diameter of the tube and is deformed elastically so as to increase the diameter of certain turns, in order to be able to engage the end of the tube along part of its length, before releasing these turns so that they enclose the tube.
  • the rigid helical element can, in all these embodiments, be consisting of a simple rigid wire wound helically.
  • the ratio of the pitch of the helix to the diameter of the turns is between 0.1 and 5.0 and preferably between 0.5 and 3.0.
  • the rigid helical element can possibly extend according to the entire length of the tube.
  • the diameter of the last turn of the element Rigid helical, located outside the tube is smaller than the diameter other turns of this element.
  • the invention makes it possible to very effectively prevent clogging of tube inlets of exchangers by suspended materials likely to become against these entries.
  • Figure 1 represents a box 1 water supply tube 2 circular section of a heat exchanger thermal, this box being itself supplied with water by a conduit 3.
  • the helical turn formed by the wire 5a preferably a diameter at rest higher to the inner diameter of the associated tube and is elastically deformable.
  • the helically wound wire 5, which protrudes outside the tube 2 can occupy only a short length of it, in the vicinity of its entrance, or extend inside this tube following a major part of its length, if at the same time it serves as a promoter of turbulence.
  • Figure 3 shows another form of implementation of the invention wherein the yarn 10 wound helically encircles the upstream end of tube 11 and heat exchanger 10 protrudes to beyond the inlet of this tube.
  • the helical coils normally have a diameter less than the outer diameter of the tube, as shown by the portion 10 has projecting, and some of them have been elastically deformed to increase its diameter so as to engage the end y of the tube, to be then released, in order to grip the tube.
  • These tubes have a length of 6 m and a diameter internal 15 mm.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (9)

  1. Verwendung eines steifen schraubenförmigen Elements (5, 16) in Verbindung mit einem Wärmeaustauschrohr (2, 11) mit kreisförmigem Querschnitt, in dem eine Flüssigkeit umzulaufen bestimmt ist,
       wobei das steife schraubenförmige Element (5, 16) am Eingang dieses Rohrs nach außen vorsteht, um Materialien, die von der Flüssigkeit transportiert werden und geeignet sind, den Eingang zu verstopfen, auf Abstand zu halten, und
       wobei das steife schraubenförmige Element (5, 10) mit dem Ende des zugeordneten Rohrs (2, 11) ohne Verwendung eines Hilfsmittels zur Befestigung verbunden ist,
       dadurch gekennzeichnet, dass
       das steife schraubenförmige Element (5, 10) mit seinen elastisch verformten Windungen an der Innen- oder Außenfläche des Rohrs (2, 11) anliegt.
  2. Verwendung nach Anspruch 1, dadurch gekennzeichnet, dass das steife schraubenförmige Element (5, 6, 10) stromaufwärts von dem Eingang des Rohrs aus vorsteht entsprechend einem Abstand, der ungefähr zwischen den Einfachen und dem Zehnfachen des Außendurchmessers des zugeordneten Rohrs liegt und vorzugsweise zwischen dem Zweifachen und dem Achtfachen des Durchmessers.
  3. Verwendung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das steife schraubenförmige Element (5) aus Windungen gebildet ist, die
       einen Durchmesser aufweisen, der normalerweise größer als der Innendurchmesser des zugeordneten Rohrs (2) ist, und
       durch Elastizität fest an dessen Innenwand anliegen.
  4. Verwendung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das steife schraubenförmige Element (10) elastisch einem Abschnitt seiner Länge nach den Außenabschnitt des zugeordneten Rohrs (11) umschließt.
  5. Verwendung nach Anspruch 4, dadurch gekennzeichnet, dass
       die Windungen des steifen schraubenförmige Elements (10) einen Durchmesser aufweisen, der normalerweise kleiner als der Außendurchmesser des zugeordneten Rohrs (11) ist,
       wobei diejenigen dieser Windungen, die das Rohr umschließen, elastisch verformt wurden, um zu ermöglichen, das Rohr in sie hineinzustecken.
  6. Verwendung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass das steife schraubenförmige Element (5, 10) aus einem steifen Draht besteht, der so aufgerollt wurde, dass eine Schraubenlinie gebildet wird.
  7. Verwendung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass das Verhältnis zwischen der Ganghöhe der Schraubenlinie des steifen schraubenförmigen Elements (5, 10) und dem Durchmesser der Windungen zwischen 0,1 und 5 liegt, vorzugsweise zwischen 0,5 und 3,0.
  8. Verwendung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass der Durchmesser der letzten Windung des steifen schraubenförmigen Elements, die außerhalb des Rohres liegt, kleiner ist als der Durchmesser der Schraubenlinie dieses Elements.
  9. Verwendung nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass das steife schraubenförmige Element (5, 10) sich über die gesamte Länge des zugeordneten Rohrs (2, 11) erstreckt.
EP99961127A 1998-12-22 1999-12-21 Benutzung eines starren, schraubenförmigen Elements in Verbindung mit einem Wärmetauscherrohr Expired - Lifetime EP1144934B9 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9816222 1998-12-22
FR9816222A FR2787564B1 (fr) 1998-12-22 1998-12-22 Perfectionnements apportes aux tubes d'echangeurs thermiques, en vue d'eviter le colmatage de leur entree par des materiaux en suspension
PCT/FR1999/003226 WO2000037874A1 (fr) 1998-12-22 1999-12-21 Dispositif pour eviter le colmatage des tubes d'echangeurs de chaleur

Publications (3)

Publication Number Publication Date
EP1144934A1 EP1144934A1 (de) 2001-10-17
EP1144934B1 true EP1144934B1 (de) 2005-08-31
EP1144934B9 EP1144934B9 (de) 2006-03-08

Family

ID=9534310

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99961127A Expired - Lifetime EP1144934B9 (de) 1998-12-22 1999-12-21 Benutzung eines starren, schraubenförmigen Elements in Verbindung mit einem Wärmetauscherrohr

Country Status (7)

Country Link
EP (1) EP1144934B9 (de)
AT (1) ATE303574T1 (de)
AU (1) AU1784600A (de)
DE (1) DE69927053T2 (de)
ES (1) ES2249051T3 (de)
FR (1) FR2787564B1 (de)
WO (1) WO2000037874A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124065A (en) * 1976-11-04 1978-11-07 Water Services Of America, Inc. Apparatus for cleaning heat exchanger tubes

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1172938A (en) 1915-04-02 1916-02-22 Gustavus T Buxton Fluid system.
US2774569A (en) 1954-04-05 1956-12-18 Karl Oscar F Jacobsen Earth moving hydraulic suction nozzles
DE2952169A1 (de) * 1979-12-22 1981-07-02 Serck Gmbh, 2000 Hamburg Verfahren und vorrichtung zum verhindern der sediment-ablagerung in steigrohren von verdampfern
US4489776A (en) 1983-07-21 1984-12-25 Water Services Of America, Inc. Heat exchanger with tube cleaning element capturing cage interconnection
US4590994A (en) 1984-08-17 1986-05-27 Champion Elmer L Heat exchanger tube strainer
FR2589229B1 (fr) * 1985-10-25 1988-01-08 Neu Ets Procede et dispositif automatique de nettoyage d'un echangeur de chaleur pour fluides gazeux
FR2611879B1 (fr) 1987-02-23 1990-06-22 Chausson Usines Sa Echangeur de chaleur a faisceau tubulaire et a perturbateur interne
FR2639425B1 (fr) * 1988-11-18 1991-06-07 Total France Procede et dispositif de nettoyage d'un tube dans lequel circule un fluide, et utilisation dans les tubes d'echangeurs de chaleur
US5102537A (en) 1990-09-18 1992-04-07 Jones Joseph R Piping outlet protector
US5509467A (en) 1994-06-28 1996-04-23 Champion Clam Traps, Inc. Heat exchanger tube strainer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4124065A (en) * 1976-11-04 1978-11-07 Water Services Of America, Inc. Apparatus for cleaning heat exchanger tubes

Also Published As

Publication number Publication date
WO2000037874A1 (fr) 2000-06-29
DE69927053T2 (de) 2006-06-22
ES2249051T3 (es) 2006-03-16
AU1784600A (en) 2000-07-12
EP1144934A1 (de) 2001-10-17
DE69927053D1 (de) 2005-10-06
ATE303574T1 (de) 2005-09-15
EP1144934B9 (de) 2006-03-08
FR2787564B1 (fr) 2001-03-02
FR2787564A1 (fr) 2000-06-23

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