EP0908669A1 - Low pressure feedwater preheater - Google Patents

Low pressure feedwater preheater Download PDF

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Publication number
EP0908669A1
EP0908669A1 EP97810761A EP97810761A EP0908669A1 EP 0908669 A1 EP0908669 A1 EP 0908669A1 EP 97810761 A EP97810761 A EP 97810761A EP 97810761 A EP97810761 A EP 97810761A EP 0908669 A1 EP0908669 A1 EP 0908669A1
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EP
European Patent Office
Prior art keywords
bundle
support plates
feed water
low
pressure feed
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.)
Granted
Application number
EP97810761A
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German (de)
French (fr)
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EP0908669B1 (en
Inventor
Herbert Wernig
Mustafa Dr. Youssef
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.)
General Electric Switzerland GmbH
Original Assignee
ABB Asea Brown Boveri Ltd
Asea Brown Boveri AB
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 ABB Asea Brown Boveri Ltd, Asea Brown Boveri AB filed Critical ABB Asea Brown Boveri Ltd
Priority to DE59708896T priority Critical patent/DE59708896D1/en
Priority to EP97810761A priority patent/EP0908669B1/en
Priority to JP10285266A priority patent/JP2000240903A/en
Priority to US09/168,995 priority patent/US5975030A/en
Publication of EP0908669A1 publication Critical patent/EP0908669A1/en
Application granted granted Critical
Publication of EP0908669B1 publication Critical patent/EP0908669B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines

Definitions

  • the invention relates to a low-pressure feed water preheater heated by bleed steam or heaters with two-flow tube bundles Tube plate design for power plants, and in particular a construction for the Tube bundle carrier.
  • Low pressure feed water preheaters are well known. They are arranged in a power plant between the condenser and a degasser and serve to preheat the feed water in a steam-water circuit by exchanging heat between steam and feed water flowing in pipes.
  • the steam is tapped by a low-pressure turbine and fed into the preheater, where it condenses on the pipes and heats the feed water.
  • the heater is used to reheat heating water that flows through a district heating circuit.
  • the feed water flows from a water chamber divided into two parts, which is arranged at one end of the preheater, via a two-flow system.
  • This consists of a bundle of tubes, which are either laid out together with a deflection chamber or U-shaped.
  • the water flows from the first part of the water chamber through the pipes via the deflection chamber or via the U back into the second part of the water chamber, the cold half of the pipes being referred to as the cold leg and the warm half as the warm leg.
  • the tube bundles are each firmly anchored in a plate which is then arranged in the water chamber.
  • the tubes are held and supported by bundle supports, which each consist of support plates and side members.
  • the steam tapped by the turbine passes through the steam inlet opening into the low-pressure feedwater preheater and is distributed through a baffle plate, so that it first flows into an annular steam space between the casing shell and the tube bundle and then penetrates radially into the bundle along the entire tube bundle length and at the Pipe surfaces condensed.
  • Direct flow of the steam into the Bundelgasse is prevented by side panels arranged on the outside.
  • One or more ventilation pipes are arranged in the Bundelgasse. These have several extraction holes through which the non-condensable gases are extracted. The gases collect in the zone in which the lowest pressure prevails.
  • the zone of the lowest pressure does not run parallel to the tubes and along the center of the bundle alley, but gradually shifts from the center of the bundle to the cold leg of the tube bundle. It therefore runs obliquely from the middle of the deflection side of the tubes to the cold inlet side of the tubes at the water chamber. It is not possible to ideally place a suction pipe in this low pressure zone, since such a suction pipe would have to be placed on or in the cold leg on the tube bottom side.
  • DE 28 20 736 describes a feed water preheater which has a partition in the bundle alley between the cold and warm legs of the tube bundle, which extends along the entire length of the tube bundle.
  • the partition wall results in a low pressure zone on both sides and in the vicinity of the Bundelgasse, which does not extend into the tube bundle.
  • On each side of the partition there are suction pipes with ventilation openings through which the non-condensable gases are extracted. This ensures that ventilation pipes are located at the lowest pressures in both the warm and the cold half of the bundle.
  • the dividing wall that is continuous over the bundle length is welded to the side plates of the bundle carrier.
  • the perforated support plate which consists of two halves, is also welded to the side panels and the partition.
  • the welded connections are technically well suited for this type of preheater, but the manufacture of the bundle carriers with this welded construction requires a great deal of time, labor and costs.
  • the invention has for its object to avoid the great effort in the manufacture of the bundle carrier with a partition and to find a construction for the bundle carrier, the manufacture of which is as simple and inexpensive and in particular requires as little or no welding work.
  • This object is achieved according to the invention by a low-pressure preheater or heater according to the preamble of the main claim, the two-flow tube bundle of which has a bundle support structure, the support plates of which are each made from a single piece and are thus continuous, and the partition consists of individual sheet metal parts which are arranged between the side plates and the continuous support plates.
  • the sheet metal parts of the partition are mechanically guided by a toothing in the support plates.
  • the sheet metal parts of the partition have at least one toothing on each side facing the support plates, which fit into openings in the support plate.
  • the side plates like the support plates, are also each made from a single piece, are continuous and are guided through the support plate.
  • This design for the bundle carrier has the advantage that the individual parts, the support plates, partition wall parts and side panels are each machine-made from one piece and, if possible, assembled without any further machine operation. The time-consuming welding work is no longer necessary, and the bundle carrier is made much easier to manufacture, with which time is saved and costs are significantly reduced.
  • the feed water preheater in FIGS. 1 a), b) and 2 has a steam inlet opening 2 and a condensate outlet opening 3 on its steam jacket 1.
  • the steam jacket 1 encloses a steam chamber 4 and a tube bundle 5.
  • a cylindrically curved baffle plate 13 is arranged at the steam inlet opening 2, through which the incoming steam is deflected into the steam chamber 4 and the tube bundle 5 does not flow directly against it.
  • At one end of the preheater there is a divided water chamber 6 with inlet and outlet openings 18, from which the feed water flows through the two legs of the tube bundle 5 and back into the water chamber.
  • the tube bundle 5 is anchored in a tube sheet 7 and is supported by a tube bundle carrier which has support plates 8 and side plates 9.
  • FIG. 1 shows the profile of a support plate 8 with drilled openings for the suction pipes 12 and tie rods 10 and milled slot openings 14 for the side plates 9. The outline of the perforation for the tube bundle is indicated by dashed lines.
  • the support plates 8 are further supported on two arranged on the inner wall of the steam jacket 1 angle 15, on which the support plates 8 with the tube bundle 5 can move freely in the longitudinal and transverse directions due to the uneven thermal expansion of the warm and cold pipe legs.
  • the support plate 8 also has four supports 21 in the form of wings for the purpose of lateral guidance of the bundle carriers on the inner wall of the steam jacket 1.
  • the supports 21 are each shaped such that their edge runs parallel to the inner wall of the steam jacket 1.
  • the support 21 is not located directly on the inner wall of the steam jacket 1, but between it and the inner wall of the steam jacket 1 there is a free or free space for displacements of the support plates 8 due to thermal expansion of the tube bundle.
  • FIG. 3 again shows the support plates 8 with milled slot openings 14 through which the side plates 9 are pushed, as well as the drill openings for the suction pipes 12 and tie rods 10.
  • the individual plate parts of the partition 11 have, for example, all four corners and in the middle of the edges facing the support plate 8, toothing 16 according to FIG. 4. These teeth 16 are inserted into openings 17 in the support plate 8 which are adapted to them during assembly. The attachment and guidance of the partition wall parts 11 in the support plates 8 are ensured by the toothing on each side facing the support plate.
  • toothing 16 shown with teeth shaped at right angles
  • other toothing forms are also conceivable, such as toothing with triangular shapes.
  • the support plates 8 are clamped together by means of tie rods 10, spacer sleeves 19 and nuts 20.
  • the tie rods 10 and spacer sleeves 19 expand as a result of heating and move together with the support plates 8 in the longitudinal direction.
  • the tubes also expand in the longitudinal direction, but to a different extent and unevenly due to the different temperatures of the cold and warm legs, which is ensured by the free displacement of the tubes in the support plates 8.
  • All components of the bundle carrier according to the invention consisting of support plates, dividing wall parts, side plates, spacer sleeves and tie rods are completely prefabricated in the factory and can be assembled inexpensively without (or as little as possible) welding work.

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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)

Abstract

The low pressure preheater, for stored water, has separate support plates (8) for the tube bundles, each in a single piece. The dividing wall (11) is of separate sheet sections, bonded to the support plates (8). The side plates (9) are each in a single piece, held in slit openings (14) at the support plates (8). The support plates (8) are held together in tension by tie rods.

Description

Technisches GebietTechnical field

Die Erfindung betrifft einen durch Anzapfdampf beheizten Niederdruck-Speisewasservorwärmer oder Heizer mit Zwei-Fluss-Rohrbündeln der Rohrbodenbauart für Kraftwerksanlagen, und insbesondere eine Konstruktion für die Rohrbündelträger.The invention relates to a low-pressure feed water preheater heated by bleed steam or heaters with two-flow tube bundles Tube plate design for power plants, and in particular a construction for the Tube bundle carrier.

Stand der TechnikState of the art

Niederdruck-Speisewasservorwärmer sind allgemein bekannt. Sie sind in einer Kraftwerksanlage zwischen dem Kondensator und einem Entgaser angeordnet und dienen der Vorwärmung des Speisewassers in einem Dampf-Wasserkreislauf durch Wärmetausch zwischen Dampf und in Rohren fliessendem Speisewasser. Der Dampf wird hierzu von einer Niederdruckturbine angezapft und in den Vorwärmer geleitet, wo er an den Rohren kondensiert und das Speisewasser erwärmt. In einem Fernheizwerk dient der Heizer der Wiederaufwärmung von Heizwasser, das durch einen Fernheizkreislauf fliesst.
Mit dem angezapften Dampf sowie aus der Atmosphäre, insbesondere bei im Vakuumbereich betriebene Vorwärmer, gelangt Luft (nicht kondensierbare Gase) in den Vorwärmer, welche den Wärmeübergang behindert. Diese Behinderung wird durch eine Entlüftung der Apparate durch Absaugen dieser nicht kondensierbaren Gase behoben, weswegen verschiedene Massnahmen getroffen werden müssen, um die Gase möglichst vollständig wegzuführen. Low pressure feed water preheaters are well known. They are arranged in a power plant between the condenser and a degasser and serve to preheat the feed water in a steam-water circuit by exchanging heat between steam and feed water flowing in pipes. The steam is tapped by a low-pressure turbine and fed into the preheater, where it condenses on the pipes and heats the feed water. In a district heating plant, the heater is used to reheat heating water that flows through a district heating circuit.
With the tapped steam and from the atmosphere, especially with preheaters operated in a vacuum area, air (non-condensable gases) enters the preheater, which hinders the heat transfer. This hindrance is remedied by venting the apparatus by extracting these non-condensable gases, which is why various measures must be taken to remove the gases as completely as possible.

Das Speisewasser fliesst von einer in zwei Teile unterteilte Wasserkammer, die an einem Ende des Vorwärmers angeordnet ist, über ein Zwei-Fluss-System. Dies besteht aus einem Bündel von Rohren, die entweder gerade zusammen mit einer Umlenkkammer oder U-förmig ausgelegt sind. Das Wasser fliesst von dem ersten Teil der Wasserkammer durch die Rohre über die Umlenkkammer bzw. über das U zurück in den zweiten Teil der Wasserkammer, wobei die kalte Hälfte der Rohre als kalter Schenkel bzw. die warme Hälfte als warmer Schenkel bezeichnet wird. In Speisewasservorwärmern der Rohrbodenbauart sind die Rohrbündel jeweils in einer Platte fest verankert, der anschliessend der Wasserkammer angeordnet ist. Ferner sind die Rohre durch Bündelträger gehalten und gestützt, die jeweils aus Stützplatten und Längsträgern bestehen.
Der von der Turbine angezapfte Dampf tritt durch die Dampfeintrittsöffnung in den Niederdruck-Speisewasservorwärmer und wird durch ein Prallblech verteilt, sodass er zunächst in einen ringförmigen Dampfraum zwischen dem Gehäusemantel und dem Rohrbündel fliesst und sodann entlang der gesamten Rohrbündellänge radial in das Bündel dringt und an den Rohroberflächen kondensiert. In der Mitte des Rohrbündels ist ein freier Raum, die sogenannte Bündelgasse. Direktes Einströmen des Dampfes in die Bündelgasse wird durch aussen angeordnete Seitenbleche verhindert. In der Bündelgasse sind ein oder mehrere Entlüftungsrohre angeordnet. Diese weisen mehrere Absauglöcher auf, durch die die nicht kondensierbaren Gase abgesaugt werden. Die Gase sammeln sich in der Zone, in der der tiefste Druck herrscht. Es hat sich gezeigt, dass die Zone des tiefsten Drucks nicht parallel zu den Rohren und entlang der Mitte der Bündelgasse verläuft, sondern von der Mitte des Bündels sich allmählich zum kalten Schenkel des Rohrbündels verschiebt. Sie verläuft also von der Mitte der Umlenkungsseite der Rohre schräg zur kalten Eintrittsseite der Rohre bei der Wasserkammer. Ein Absaugrohr ideal in dieser Tiefstdruckzone zu plazieren ist nicht möglich, da ein solches Absaugrohr an der Rohrbodenseite am oder im kalten Schenkel plaziert werden müsste.
In der DE 28 20 736 ist ein Speisewasservorwärmer beschrieben, der in der Bündelgasse zwischen dem kalten und warmen Schenkel des Rohrbündels eine Trennwand aufweist, die sich entlang der gesamten Länge des Rohrbündels erstreckt. Durch die Trennwand ergeben sich in der Bündelgasse beidseitig und in der Nähe von ihr je eine Tiefstdruckzone, die sich nicht in das Rohrbündel erstreckt. Hier auf jeder Seite der Trennwand sind Absaugrohre mit Entlüftungsöffnungen angeordnet, durch die die nicht kondensierbaren Gase abgesaugt werden. Dadurch ist sichergestellt, dass sich Entlüftungsrohre an den Stellen der tiefsten Drücke sowohl in der warmen als auch in der kalten Bündelhälfte befinden.
Die über die Bündellänge durchgehende Trennwand ist mit den Seitenblechen der Bündelträger verschweisst. Die aus zwei Hälften bestehende perforierte Stützplatte ist ebenfalls mit den Seitenblechen und der Trennwand veschweisst. Die Schweissverbindungen sind für diese Art Vorwärmer technisch gut geeignet, die Fabrikation der Bündelträger erfordert jedoch mit dieser Schweisskonstruktion einen grossen Zeit-, Arbeits- sowie Kostenaufwand.The feed water flows from a water chamber divided into two parts, which is arranged at one end of the preheater, via a two-flow system. This consists of a bundle of tubes, which are either laid out together with a deflection chamber or U-shaped. The water flows from the first part of the water chamber through the pipes via the deflection chamber or via the U back into the second part of the water chamber, the cold half of the pipes being referred to as the cold leg and the warm half as the warm leg. In feedwater preheaters of the tube sheet design, the tube bundles are each firmly anchored in a plate which is then arranged in the water chamber. Furthermore, the tubes are held and supported by bundle supports, which each consist of support plates and side members.
The steam tapped by the turbine passes through the steam inlet opening into the low-pressure feedwater preheater and is distributed through a baffle plate, so that it first flows into an annular steam space between the casing shell and the tube bundle and then penetrates radially into the bundle along the entire tube bundle length and at the Pipe surfaces condensed. There is a free space in the middle of the tube bundle, the so-called Bundelgasse. Direct flow of the steam into the Bundelgasse is prevented by side panels arranged on the outside. One or more ventilation pipes are arranged in the Bundelgasse. These have several extraction holes through which the non-condensable gases are extracted. The gases collect in the zone in which the lowest pressure prevails. It has been shown that the zone of the lowest pressure does not run parallel to the tubes and along the center of the bundle alley, but gradually shifts from the center of the bundle to the cold leg of the tube bundle. It therefore runs obliquely from the middle of the deflection side of the tubes to the cold inlet side of the tubes at the water chamber. It is not possible to ideally place a suction pipe in this low pressure zone, since such a suction pipe would have to be placed on or in the cold leg on the tube bottom side.
DE 28 20 736 describes a feed water preheater which has a partition in the bundle alley between the cold and warm legs of the tube bundle, which extends along the entire length of the tube bundle. The partition wall results in a low pressure zone on both sides and in the vicinity of the Bundelgasse, which does not extend into the tube bundle. On each side of the partition there are suction pipes with ventilation openings through which the non-condensable gases are extracted. This ensures that ventilation pipes are located at the lowest pressures in both the warm and the cold half of the bundle.
The dividing wall that is continuous over the bundle length is welded to the side plates of the bundle carrier. The perforated support plate, which consists of two halves, is also welded to the side panels and the partition. The welded connections are technically well suited for this type of preheater, but the manufacture of the bundle carriers with this welded construction requires a great deal of time, labor and costs.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, den grossen Aufwand in der Fabrikation der Bündelträger mit Trennwand zu vermeiden und eine Konstruktion für die Bündelträger zu finden, deren Fabrikation möglichst einfach und kostengünstig ist und insbesondere möglichst wenig oder keine Schweissarbeit erfordert.
Diese Aufgabe ist erfindungsgemäss durch einen Niederdruck-Speisevorwärmer oder Heizer gemäss des Oberbegriffs des Hauptanspruchs gelöst, dessen Zwei-Fluss-Rohrbündel eine Bündelträgerkonstruktion aufweist, deren Stützplatten je aus einem einzigen Stück gefertigt und somit durchgehend sind, und die Trennwand aus einzelnen Blechteilen besteht, die zwischen den Seitenblechen und den durchgehenden Stützplatten angeordnet sind.
In einer Ausführung der Erfindung sind die Blechteile der Trennwand mechanisch durch eine Verzahnung in den Stützplatten geführt. Hierzu weisen die Blechteile der Trennwand auf jeder den Stützplatten zugewandten Seiten mindestens eine Verzahnung auf, die zu Öffnungen in der Stützplatte passen. Die Seitenbleche sind, wie die Stützplatten, ebenfalls je aus einem einzigen Stück gefertigt, durchgehend und durch die Stützplatte geführt.
Diese Konstruktion für die Bündelträger hat den Vorteil, dass die einzelnen Teile, die Stützplatten, Trennwandteile und Seitenbleche je aus einem Stück maschinell gefertigt und möglichst ohne weiteren Maschinenarbeitsgang zusammengebaut werden. Die aufwendigen Schweissarbeiten fallen weg, und es ergibt sich eine stark vereinfachte Fabrikation des Bündelträgers, mit der Zeit eingespart und Kosten bedeutend reduziert werden.The invention has for its object to avoid the great effort in the manufacture of the bundle carrier with a partition and to find a construction for the bundle carrier, the manufacture of which is as simple and inexpensive and in particular requires as little or no welding work.
This object is achieved according to the invention by a low-pressure preheater or heater according to the preamble of the main claim, the two-flow tube bundle of which has a bundle support structure, the support plates of which are each made from a single piece and are thus continuous, and the partition consists of individual sheet metal parts which are arranged between the side plates and the continuous support plates.
In one embodiment of the invention, the sheet metal parts of the partition are mechanically guided by a toothing in the support plates. For this purpose, the sheet metal parts of the partition have at least one toothing on each side facing the support plates, which fit into openings in the support plate. The side plates, like the support plates, are also each made from a single piece, are continuous and are guided through the support plate.
This design for the bundle carrier has the advantage that the individual parts, the support plates, partition wall parts and side panels are each machine-made from one piece and, if possible, assembled without any further machine operation. The time-consuming welding work is no longer necessary, and the bundle carrier is made much easier to manufacture, with which time is saved and costs are significantly reduced.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Es zeigen:

  • Fig. 1 a) und b) axiale Längsschnitte durch einen Niederdruck-Speisewasservorwärmer, um 90° zueinander stehend.
  • Fig. 2 einen Querschnitt eines Speisewasservorwärmers gemäss Fig. 1.
  • Fig. 3 einen Bündelträger in Perspektive gemäss der Erfindung.
  • Fig. 4 eine Detailansicht der Verzahnung von zwei Blechteilen der Trennwand mit einer Stützplatte.
    • Show it:
  • Fig. 1 a) and b) axial longitudinal sections through a low-pressure feed water preheater, standing at 90 ° to each other.
  • FIG. 2 shows a cross section of a feed water preheater according to FIG. 1.
  • Fig. 3 shows a bundle carrier in perspective according to the invention.
  • Fig. 4 is a detailed view of the teeth of two sheet metal parts of the partition with a support plate.

    • Weg der Ausführung der ErfindungWay of carrying out the invention

    Der Speisewasservorwärmer in den Figuren 1 a), b) und 2 weist an seinem Dampfmantel 1 eine Dampfeintrittsöffnung 2 und eine Kondensataustrittsöffnung 3 auf. Der Dampfmantel 1 umschliesst einen Dampfraum 4 und ein Rohrbündel 5. An der Dampfeintrittsöffnung 2 ist ein zylindrisch gewölbtes Prallblech 13 angeordnet, durch das der eintretende Dampf in den Dampfraum 4 abgelenkt wird und das Rohrbündel 5 nicht direkt anströmt. An einem Ende des Vorwärmers ist eine unterteilte Wasserkammer 6 mit Ein- und Austrittsöffnungen 18 angeordnet, aus der das Speisewasser durch die beiden Schenke des Rohrbündels 5 und zurück in die Wasserkammer fliesst. Das Rohrbündel 5 ist in einem Rohrboden 7 verankert und durch einen Rohrbündelträger gestützt, der Stützplatten 8 und Seitenbleche 9 aufweist. Die Stützplatten 8 sind ferner durch Tie-Rods 10 mit Abstandhülsen 19 und Muttern 20 zusammengehalten. Zwischen den Rohrschenkeln in der Bündelgasse ist eine Trennwand 11 angeordnet, beidseitig davon sind Absaugrohre 12 zur Entlüftung des Dampfes vorgesehen. Wie bereits erwähnt bildet sich hier die Zone des tiefsten Drucks, sodass die nicht kondensierbaren Gase sich in dieser Zone sammeln und durch Öffnungen in den Absaugrohren 12 weggeführt werden. Figur 2 zeigt das Profil einer Stützplatte 8 mit gebohrten Öffnungen für die Absaugrohre 12 und die Tie-Rods 10 sowie gefrästen Schlitzöffnungen 14 für die Seitenbleche 9. Der Umriss der Perforierung für das Rohrbündel ist mit gestrichelten Linien angedeutet. Die Stützplatten 8 sind ferner auf zwei an der Innenwand des Dampfmantels 1 angeordneten Winkel 15 abgestützt, auf denen die Stützplatten 8 mit dem Rohrbündel 5 infolge der ungleichen thermischen Ausdehnung des warmen und kalten Rohrschenkels, in Längs- und Querrichtung sich frei bewegen können. Die Stützplatte 8 weist ferner vier Abstützungen 21 in Form von Flügeln auf zwecks seitlicher Führung der Bündelträger auf der Innenwand des Dampfmantels 1. Die Abstützungen 21 sind jeweils so geformt, dass ihr Rand parallel zur Innenwand des Dampfmantels 1 verläuft. Die Abstützung 21 liegt nicht direkt an der Innenwand des Dampfmantels 1, sondern es besteht zwischen ihr und der Innenwand des Dampfmantels 1 ein Frei- oder Spielraum für Verschiebungen der Stützplatten 8 infolge thermischer Ausdehnungen des Rohrbündels. Die Stützplatte 8 darf sich also aufgrund thermischer Ausdehnungen des Rohrbündels 5 verschieben bis die Abstützung 21 mit der Innenwand des Dampfmantels 1 in Berührung kommt und dort abgestützt wird.
    Figur 3 zeigt wiederum die Stützplatten 8 mit gefrästen Schlitzöffnungen 14, durch die die Seitenbleche 9 geschoben werden, sowie die Bohröffnungen für die Absaugrohre 12 und die Tie-Rods 10. Die einzelnen Blechteile der Trennwand 11 weisen beispielsweise an allen vier Ecken sowie in der Mitte der Kanten, die der Stützplatte 8 zugewandt sind, Verzahnungen 16 gemäss Figur 4 auf. Diese Verzahnung 16 werden bei der Montage in ihnen angepasste Öffnungen 17 in der Stützplatte 8 eingeführt. Die Befestigung und Führung der Trennwandteile 11 in den Stützplatten 8 sind durch die Verzahnungen auf jeder Seite, die der Stützplatte zugewandt ist, gewährleistet. Selbstverständlich sind ausser der dargestellten Verzahnung 16 mit rechtwinklig geformten Zähnen auch weitere Verzahnungsformen denkbar, wie zum Beispiel Verzahnungen mit Dreiecksformen.
    Die Stützplatten 8 sind mittels Tie-Rods 10, Abstandhülsen 19 und Muttern 20 zusammensgespannt. Die Tie-Rods 10 und Abstandhülsen 19 dehnen sich infolge Aufwärmung und verschieben sich zusammen mit den Stützplatten 8 in Längsrichtung. Die Rohre dehnen sich ebenfalls in der Längsrichtung, jedoch zu einem anderen Ausmass und durch die verschiedenen Temperaturen des kalten und warmen Schenkels ungleichmässig, welches durch die freie Verschiebung der Rohre in den Stützplatten 8 gewährleistet ist. Sämtliche Bestandteile des erfindungsgemässen Bündelträgers bestehend aus Stützplatten, Trennwandteilen, Seitenblechen, Abstandhülsen und Tie-Rods werden in der Fabrik vollständig vorgefertig und schnell, ohne (oder möglichst wenig) Schweissarbeit kostengünstig zusammengebaut.     The feed water preheater in FIGS. 1 a), b) and 2 has a steam inlet opening 2 and a condensate outlet opening 3 on its steam jacket 1. The steam jacket 1 encloses a steam chamber 4 and a tube bundle 5. A cylindrically curved baffle plate 13 is arranged at the steam inlet opening 2, through which the incoming steam is deflected into the steam chamber 4 and the tube bundle 5 does not flow directly against it. At one end of the preheater there is a divided water chamber 6 with inlet and outlet openings 18, from which the feed water flows through the two legs of the tube bundle 5 and back into the water chamber. The tube bundle 5 is anchored in a tube sheet 7 and is supported by a tube bundle carrier which has support plates 8 and side plates 9. The support plates 8 are also held together by tie rods 10 with spacer sleeves 19 and nuts 20. A partition 11 is arranged between the pipe legs in the bundle alley, suction pipes 12 are provided on both sides thereof for venting the steam. As already mentioned, the zone of the lowest pressure forms here, so that the non-condensable gases collect in this zone and are led away through openings in the suction pipes 12. Figure 2 shows the profile of a support plate 8 with drilled openings for the suction pipes 12 and tie rods 10 and milled slot openings 14 for the side plates 9. The outline of the perforation for the tube bundle is indicated by dashed lines. The support plates 8 are further supported on two arranged on the inner wall of the steam jacket 1 angle 15, on which the support plates 8 with the tube bundle 5 can move freely in the longitudinal and transverse directions due to the uneven thermal expansion of the warm and cold pipe legs. The support plate 8 also has four supports 21 in the form of wings for the purpose of lateral guidance of the bundle carriers on the inner wall of the steam jacket 1. The supports 21 are each shaped such that their edge runs parallel to the inner wall of the steam jacket 1. The support 21 is not located directly on the inner wall of the steam jacket 1, but between it and the inner wall of the steam jacket 1 there is a free or free space for displacements of the support plates 8 due to thermal expansion of the tube bundle. The support plate 8 may therefore shift due to thermal expansion of the tube bundle 5 until the support 21 comes into contact with the inner wall of the steam jacket 1 and is supported there.
    FIG. 3 again shows the support plates 8 with milled slot openings 14 through which the side plates 9 are pushed, as well as the drill openings for the suction pipes 12 and tie rods 10. The individual plate parts of the partition 11 have, for example, all four corners and in the middle of the edges facing the support plate 8, toothing 16 according to FIG. 4. These teeth 16 are inserted into openings 17 in the support plate 8 which are adapted to them during assembly. The attachment and guidance of the partition wall parts 11 in the support plates 8 are ensured by the toothing on each side facing the support plate. Of course, in addition to the toothing 16 shown with teeth shaped at right angles, other toothing forms are also conceivable, such as toothing with triangular shapes.
    The support plates 8 are clamped together by means of tie rods 10, spacer sleeves 19 and nuts 20. The tie rods 10 and spacer sleeves 19 expand as a result of heating and move together with the support plates 8 in the longitudinal direction. The tubes also expand in the longitudinal direction, but to a different extent and unevenly due to the different temperatures of the cold and warm legs, which is ensured by the free displacement of the tubes in the support plates 8. All components of the bundle carrier according to the invention consisting of support plates, dividing wall parts, side plates, spacer sleeves and tie rods are completely prefabricated in the factory and can be assembled inexpensively without (or as little as possible) welding work.

    BezugszeichenlisteReference list

    11
    DampfmantelSteam jacket
    22nd
    DampfeintrittsöffnungSteam inlet opening
    33rd
    KondensataustrittsöffnungCondensate outlet opening
    44th
    DampfraumSteam room
    55
    RohrbündelTube bundle
    66
    WasserkammerWater chamber
    77
    RohrbodenTube sheet
    88th
    StützplatteSupport plate
    99
    SeitenblechPage sheet
    1010th
    Tie-RodTie rod
    1111
    TrennwandteilPartition part
    1212th
    AbsaugrohreSuction pipes
    1313
    PrallblechBaffle
    1414
    gefräste Schlitzöffnungenmilled slot openings
    1515
    AbstützwinkelSupport bracket
    1616
    VerzahnungenGears
    1717th
    Öffnung für VerzahnungOpening for toothing
    1818th
    Ein-/AustrittsöffnungEntry / exit opening
    1919th
    AbstandhülsenSpacers
    2020th
    MutternNuts
    2121
    AbstützungenSupports

    Claims (7)

    Niederdruck-Speisewasservorwärmer oder Heizer in Kraftwerksanlagen, der durch Anzapfdampf beheizt wird, mit mindestens je einer am Dampfmantel (1) angebrachten Dampfeintrittsöffnung (2) und Kondensataustrittsöffnung (3) und einem Zwei-Fluss-Rohrbündel (5) der Plattenbauart, das einen kalten und warmen Schenke, mindestens eine senkrecht zur Bündelachse angeordnete Stützplatte (8) und parallel zur Bündelachse verlaufende Seitenbleche (9) aufweist, und bei dem in der Mitte des Rohrbündels (5) zwischen dem warmen und kalten Bündelschenkel eine Trennwand (11) entlang der gesamten Länge der Rohrschenkel angeordnet ist, dadurch gekennzeichnet, dass
    die einzelnen Stützplatten (8) je aus einem einzigen Stück gefertigt und durchgehend sind und die Trennwand (11) aus einzelnen Blechteilen besteht, die mit den Stützplatten (8) verbunden sind.    Low-pressure feed water preheater or heater in power plants, which is heated by bleed steam, with at least one steam inlet opening (2) and steam condensate outlet opening (3) and a two-flow tube bundle (5) of the plate type, which is cold and warm bar, has at least one support plate (8) arranged perpendicular to the bundle axis and side plates (9) running parallel to the bundle axis, and in which in the middle of the tube bundle (5) between the warm and cold bundle legs a partition (11) along the entire length the pipe leg is arranged, characterized in that
    the individual support plates (8) are each made from a single piece and are continuous and the partition (11) consists of individual sheet metal parts which are connected to the support plates (8).         Niederdruck-Speisewasservorwärmer oder Heizer nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Seitenbleche (9) je aus einem einzigen Stück gefertigt und durchgehend sind und durch Schlitzöffnungen (14) in den Stützplatten (8) geführt sind.    Low-pressure feed water preheater or heater according to claim 1,
    characterized in that
    the side plates (9) are each made from a single piece and are continuous and are guided through slot openings (14) in the support plates (8).         Niederdruck-Speisewasservorwärmer oder Heizer nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die einzelnen Blechteile der Trennwand (11) auf jeder der beiden Seiten, die einer Stützplatte (8) zugewandt ist, eine oder mehrere Verzahnungen (16) aufweisen und jede Stützplatte (8) eine zu jeder dieser Verzahnungen (16) angepasste Öffnung (17) aufweist.     Low-pressure feed water preheater or heater according to claim 1,
    characterized in that
    the individual sheet metal parts of the partition (11) have one or more toothings (16) on each of the two sides facing a support plate (8) and each support plate (8) has an opening (17) adapted to each of these toothings (16) having.         Niederdruck-Speisewasservorwärmer oder Heizer nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass
    die Stützplatten (8) des Bündelträgers mittels Tie-Rods (10) und Abstandhülsen (19) zwischen den Stützplatten (8) zusammengespannt sind.    Low-pressure feed water preheater or heater according to one of claims 1 to 3,
    characterized in that
    the support plates (8) of the bundle carrier are clamped together by means of tie rods (10) and spacer sleeves (19) between the support plates (8).         Niederdruck-Speisewasservorwärmer oder Heizer nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Stützplatten (8) mit den Rohrbündeln (5) auf zwei an der Innenwand des Dampfmantels 1 angeordneten Winkel (15) abgestützt ist, sodass das Rohrbündel (5) infolge thermischer Ausdehnungen sich horizontal frei bewegt.    Low-pressure feed water preheater or heater according to claim 1,
    characterized in that
    the support plates (8) with the tube bundles (5) are supported on two angles (15) arranged on the inner wall of the steam jacket 1, so that the tube bundle (5) moves freely horizontally as a result of thermal expansion.         Niederdruck-Speisewasservorwärmer oder Heizer nach Anspruch 1,
    dadurch gekennzeichnet, dass
    jede Stützplatte (8) mindestens vier Abstützungen (21) aufweist, die mit einem Freiraum zur Innenwand des Dampfmantels (1) angeordnet ist, der eine freie Verschiebung des Bündelträgers in Längs- und Querrichtung erlaubt.    Low-pressure feed water preheater or heater according to claim 1,
    characterized in that
    each support plate (8) has at least four supports (21) which are arranged with a free space to the inner wall of the steam jacket (1), which allows the bundle carrier to be moved freely in the longitudinal and transverse directions.         Niederdruck-Speisewasservorwärmer oder Heizer nach Anspruch 1,
    dadurch gekennzeichnet, dass,
    beidseitig der Trennwand (11) in Zonen der tiefsten Drücke Absaugrohre (12) für die Absaugung von nicht kondensierbaren Gasen verlaufen.    Low-pressure feed water preheater or heater according to claim 1,
    characterized in that
    Exhaust pipes (12) for extracting non-condensable gases run on both sides of the partition (11) in zones of the lowest pressures.
    EP97810761A 1997-10-09 1997-10-09 Low pressure feedwater preheater Expired - Lifetime EP0908669B1 (en)

    Priority Applications (4)

    Application Number Priority Date Filing Date Title
    DE59708896T DE59708896D1 (en) 1997-10-09 1997-10-09 Low-pressure feedwater
    EP97810761A EP0908669B1 (en) 1997-10-09 1997-10-09 Low pressure feedwater preheater
    JP10285266A JP2000240903A (en) 1997-10-09 1998-10-07 Low pressure supply water preheating apparatus or heater
    US09/168,995 US5975030A (en) 1997-10-09 1998-10-09 Low-pressure feedwater preheater

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP97810761A EP0908669B1 (en) 1997-10-09 1997-10-09 Low pressure feedwater preheater

    Publications (2)

    Publication Number Publication Date
    EP0908669A1 true EP0908669A1 (en) 1999-04-14
    EP0908669B1 EP0908669B1 (en) 2002-12-04

    Family

    ID=8230424

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97810761A Expired - Lifetime EP0908669B1 (en) 1997-10-09 1997-10-09 Low pressure feedwater preheater

    Country Status (4)

    Country Link
    US (1) US5975030A (en)
    EP (1) EP0908669B1 (en)
    JP (1) JP2000240903A (en)
    DE (1) DE59708896D1 (en)

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US20140202399A1 (en) * 2013-01-21 2014-07-24 Maarky Thermal Systems Inc. Dual end plate subcooling zone for a feedwater heater
    US9541280B2 (en) * 2014-06-04 2017-01-10 Fives North American Combustion, Inc. Ultra low NOx combustion for steam generator
    CN106288322B (en) * 2016-10-18 2022-01-04 东方电气集团东方锅炉股份有限公司 Longitudinal-grazing-free heat exchange superheat section structure for reducing diameter of low-pressure heater equipment

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    Publication number Priority date Publication date Assignee Title
    US2995341A (en) * 1959-01-08 1961-08-08 Griscom Russell Co Feed water heater sub-cooling zone
    DE2458437B1 (en) * 1974-12-10 1976-02-12 Kraftwerk Union Ag FEED WATER PREHEATER WITH TWO STEAM ROOMS
    DE2820736A1 (en) 1978-05-12 1979-11-15 Bbc Brown Boveri & Cie FEED WATER PREHEATER

    Family Cites Families (6)

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    Publication number Priority date Publication date Assignee Title
    CH393366A (en) * 1962-05-18 1965-06-15 Bbc Brown Boveri & Cie Steam-heated feed water preheater
    US3630276A (en) * 1970-02-10 1971-12-28 Nasa Shell-side liquid metal boiler
    US3683866A (en) * 1970-11-20 1972-08-15 Combustion Eng Superheating steam generator
    DE2642800C2 (en) * 1976-09-23 1982-12-09 Deggendorfer Werft Und Eisenbau Gmbh, 8360 Deggendorf Tube sheet connection for tube bundle reactors or tube bundle heat exchangers
    FR2477265A1 (en) * 1980-02-29 1981-09-04 Framatome Sa PRE-HEATING STEAM GENERATOR
    FR2644281B1 (en) * 1989-03-09 1991-06-07 Framatome Sa DEVICE FOR STABILIZING THE TUBES OF THE BEAM OF A STEAM GENERATOR COMPRISING ANTI-VIBRATION BARS

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2995341A (en) * 1959-01-08 1961-08-08 Griscom Russell Co Feed water heater sub-cooling zone
    DE2458437B1 (en) * 1974-12-10 1976-02-12 Kraftwerk Union Ag FEED WATER PREHEATER WITH TWO STEAM ROOMS
    DE2820736A1 (en) 1978-05-12 1979-11-15 Bbc Brown Boveri & Cie FEED WATER PREHEATER

    Also Published As

    Publication number Publication date
    DE59708896D1 (en) 2003-01-16
    EP0908669B1 (en) 2002-12-04
    JP2000240903A (en) 2000-09-08
    US5975030A (en) 1999-11-02

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