EP1144934B9 - 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
EP1144934B9
EP1144934B9 EP99961127A EP99961127A EP1144934B9 EP 1144934 B9 EP1144934 B9 EP 1144934B9 EP 99961127 A EP99961127 A EP 99961127A EP 99961127 A EP99961127 A EP 99961127A EP 1144934 B9 EP1144934 B9 EP 1144934B9
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
Other languages
English (en)
French (fr)
Other versions
EP1144934A1 (de
EP1144934B1 (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
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 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 the liquid heat exchanger tubes, in order to prevent clogging of the inlets of these tubes by materials suspended in the liquid intended to circulate in the tubes.
  • EP-A-0 219 882 discloses a heat exchanger in vertical channels from which a gaseous fluid flows.
  • these channels are housed elastic elements such as coil springs or metal son supporting blades extending radially.
  • These elastic members protrude at both ends of the tubes and are intended to be vibrated, in order to periodically clean the interior of the channels, by means of an intermittent injection of an additional compressed gas. It is not indicated in this prior document, whether the gaseous fluid flowing normally in the holds may contain materials likely to block the entry thereof. On the other hand, it is specified that, under normal conditions of use, the elastic elements are not set in motion by the gaseous fluid.
  • EP-A-0 369 851 also discloses a process for continuously cleaning a tube, in particular a heat exchanger, in which a fluid circulates, in which a helical movable element housed in this tube and hooked on one end of it by a mechanical connection leaving it 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 to scrape the inner surface of the tube during its rotation, in order to clean this tube continuously.
  • 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, helical springs protruding outside these tubes are moved inside them.
  • the present invention aims to equip this input with a simple and inexpensive means, able not only to retain the detritus entrained by the liquid penetrating into these tubes and to prevent them from being applied against the entrance of these tubes by closing them, but also to cause upstream of this inlet turbulence sufficient to prevent clogging thereof, while ensuring a homogenization of the temperature of the liquid.
  • the subject of the invention is the use, in association with a circular-section heat exchanger tube in which a liquid is called to circulate, of a rigid helical element projecting towards the outside of this tube. at the inlet thereof, in order to keep away from this inlet the materials carried by the liquid and likely to plug this inlet, the rigid helical element being secured to the end of the associated tube without use of an auxiliary fastener, characterized in that the helical rigid element is supported by its turns deformed elastically against the inner face or the outer face of the tube.
  • No. 4,424,065 discloses a use according to the preamble of claim 1.
  • This rigid helical element has the effect not only of opposing the entry into the tube of the various suspended materials entrained by the liquid, but also of causing significant turbulence of this fluid at the inlet of the tube, thus avoiding that the materials conveyed can completely block the entrance of the tube.
  • the rigid helical element protrudes upstream of the inlet of the tube at a distance of between about 1 and 10 times 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 tube inlet by hooking means known in the art, able to keep it inside or outside the tube according to the technology of the exchanger, but this use of an auxiliary fastener is not within the scope of the invention.
  • such a fastening means may be constituted, for example, in a manner known per se, by a rigid U-profile fastening member, said "pin" in the art, which is disposed outside the tube, with the ends of the branches of the U elastically close to one another and engaged in the tube inlet, while the helically wound wire is hanging on the base of the U.
  • the rigid helical element is secured to the end of the tube at the input of which it projects outwardly without the aid of any auxiliary fastening member, taking firm support by its turns deformed elastically 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, heat exchanger tubes, in which are arranged in fixed position obstacles intended to cause turbulence of the fluid flowing therein, in order to improve the heat exchange between this fluid and the tube wall and reduce the risk of solid waste deposits on the inner surface of this wall.
  • a simple way to achieve such obstacles consists in arranging inside circular section tubes, in a fixed position at contact of their inner wall, a wire, for example metal, wound helically.
  • a particularly simple means consists in using an elastically deformable helical profile wire, whose diameter of the turns is normally greater than the internal diameter of the tube, to longitudinally stretch this wire to reduce the diameter of its turns, in order to be able to introduce it into the tube, and, after having thus introduced it, to release it so that its turns tend to resume their initial diameter inside the tube, coming to apply firmly against the inner wall of the latter, without the wire may be 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 arranging in the same way a wire wound helically inside the exchanger tube. thermal, in the vicinity of the inlet of this tube, but with a projecting portion outside the tube, to oppose the passage of the materials carried by the liquid.
  • the helicoidal rigid element can, when the shape of the tubular plate of the heat exchanger, or any other similar device, make it possible to have tubes of which an outer portion of their upstream end is usable, elastically grip this end of the tube along part of its length and protrude upstream of the inlet of the tube.
  • the helical rigid element advantageously has turns of diameter normally smaller than the external diameter of the tube and is deformed elastically so as to increase the diameter of certain turns, in order to engage the end of the next tube. part of its length, before releasing these turns so that they enclose the tube.
  • the rigid helical element can, in all these embodiments, be constituted by 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 may possibly extend along the entire length of the tube.
  • the diameter of the last turn of the helical rigid element, located outside the tube is smaller than the diameter of the other turns of this element.
  • the invention makes it possible to very effectively prevent the closing of the entries of the heat exchanger tubes by suspended materials that risk being pressed against these inputs.
  • Figure 1 shows a box 1 for supplying water tubes 2 of circular section of a heat exchanger, the box itself being supplied with water through a conduit 3.
  • the helical coil formed by the wire 5 preferably has a greater rest diameter. 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 thereof, in the vicinity of its inlet, or extend inside this tube according to a major part of its length, if at the same time it serves as a promoter of turbulence.
  • FIG. 2 which does not come within the scope of the invention, there is a helically wound wire 6 which is housed at the inlet of a heat exchanger tube 7 and projects from outside of it.
  • This wire is not necessarily pressed against the inner wall of the tube, but is held in position therein by a pin formed by a metal wire curved U-shaped, the two branches can be elastically approximated one the other to be engaged in the tube 7, while the base of the U, which is simply attached to one end of the wire 6 helically wound, protrudes outside the tube.
  • 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 their diameter, in order to be able to engage the end of the tube, to be then released, in order to grip the tube.
  • These tubes have a length of 6 m and an internal diameter of 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 EP1144934B1 (de) 2005-08-31
EP1144934B9 true 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)

Family Cites Families (11)

* 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
US4124065A (en) * 1976-11-04 1978-11-07 Water Services Of America, Inc. Apparatus for cleaning heat exchanger tubes
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

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
EP1144934B1 (de) 2005-08-31
FR2787564B1 (fr) 2001-03-02
FR2787564A1 (fr) 2000-06-23

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