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EP0097989B1 - Réchauffeur d'eau d'alimentation à haute pression disposé verticalement à construction à collecteur avec un désurchauffeur et un séparateur eau-vapeur - Google Patents

Réchauffeur d'eau d'alimentation à haute pression disposé verticalement à construction à collecteur avec un désurchauffeur et un séparateur eau-vapeur Download PDF

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Publication number
EP0097989B1
EP0097989B1 EP83200846A EP83200846A EP0097989B1 EP 0097989 B1 EP0097989 B1 EP 0097989B1 EP 83200846 A EP83200846 A EP 83200846A EP 83200846 A EP83200846 A EP 83200846A EP 0097989 B1 EP0097989 B1 EP 0097989B1
Authority
EP
European Patent Office
Prior art keywords
steam
desuperheater
condensate
feed water
preheater
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
Application number
EP83200846A
Other languages
German (de)
English (en)
Other versions
EP0097989A1 (fr
Inventor
Helena Riegger
Jörg Schwander
Günter Volks
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Priority to AT83200846T priority Critical patent/ATE13463T1/de
Publication of EP0097989A1 publication Critical patent/EP0097989A1/fr
Application granted granted Critical
Publication of EP0097989B1 publication Critical patent/EP0097989B1/fr
Expired legal-status Critical Current

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Classifications

    • 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 standing high-pressure feed water preheater in a collector design with a desuperheater and a device for separating the steam and water phases according to the preamble of claim 1.
  • the feed water which is under pressure, is heated to the desired final temperature by tapping steam from the turbines in high-pressure preheaters.
  • bleed steam is, as is the rule, superheated steam
  • some of the superheating heat in a desuperheater which is the end part of the preheater tube bundle, viewed in the flow direction of the feed water to be heated, can be released to the feed water, with baffles for steam flow paths along the pipes in the Desuperheater worry.
  • the steam reaches the condensation part, where it is deposited.
  • Feed water preheaters which have desuperheaters which are open at the top or only partially closed, so that the steam can flow out at high speed and the condensate formed in the upper part of the preheater is carried upwards, causing erosion there.
  • an opening has therefore been provided in a further design in the partition between the desuperheater chamber and the condensation chamber, through which part of the steam flow is short-circuited and the speed of the remaining steam is to be reduced so that the mentioned erosion is largely avoided.
  • this measure resulted in increased erosion attacks in the condensation zone, since the steam flowing in through the opening mentioned impacts even larger drops of condensate than in the upper part of the preheater tube bundle.
  • the object of the present invention is to design the desuperheater so that in the areas of high steam speeds the collision of steam with the condensate trickling downward and the resulting erosion damage are largely avoided, which erosion damage in the rest can also occur on the pipe supports. It is also intended to prevent condensate from falling into the desuperheater, particularly during normal operation, with changes in load and when the power plant is shut down, since this would impair the thermodynamic effectiveness of the desuperheater.
  • a further object of the invention is to design those elements of the desuperheater limitation, by means of which the tube bundles are sealed off transversely to their longitudinal extension from the steam guide channels, in such a way that the assembly effort is as low as possible and, compared to the conventional technology, only little and light welding work to be performed in accessible places is required.
  • the condensate collector located below the desuperheater 1 is omitted as not essential to the invention.
  • the main parts of the desuperheater 1 are essentially a desuperheater box 2, on which the steam inlet connection 3 sits and which receives the feed water outlet header 4, an upwardly extending steam guide duct 5, which contains the last strand 7 of the preheater tube bundle 6, as seen in the flow direction of the feed water, furthermore a steam distribution channel 8 and a deflection manifold 9, which connects this to the steam distribution channel 8 at the upper end of the steam guide channel 5.
  • This distribution channel 8 is of shallow depth and forms a partition between the last strand 7 and the penultimate strand 10 of the preheater tube bundle 6.
  • a horizontal condensate collecting plate 15 is attached to the steam distribution duct 8 above the deflector 9.
  • the desuperheater is a ge with the exception of the condensate collecting plate 15 and an end plate on the top of the deflector 9 welded sheet metal construction.
  • the connection of the end plate, designated 17, to the vertical walls of the desuperheater is shown in FIGS. 8 and 9. It is simply welded at its four edges to three walls of the steam guide duct 5 and one wall of the steam distribution duct 8.
  • Both the end plate 17 and the condensate collecting plate 15 are composed of elements which allow the pipe coils of the preheater pipe bundle 6 to be installed very easily.
  • End plate elements 18, from which the end plate is composed, are shown in FIGS. 3 to 5, condensate collecting plate elements 19 in FIGS. 6 and 7 each in elevation and plan view.
  • FIG. 3 to 5 show that the width of an end plate element 18 is equal to the center distance between two adjacent pipe layers.
  • the two vertical long sides are provided with semi-circular recesses 20 distributed over the entire length, through which the tubes 21 of the preheater tube bundles are guided.
  • Fig. 4 shows two adjacent elements 18, Fig.5 in plan a section of a single element.
  • the individual layers of the tube coils are inserted into the recesses 20 of an element 18, the second element 18 is placed thereon and so on and finally, as mentioned above, the completely assembled closing plate is welded into the sheet metal structure of the desuperheater.
  • the curvature 23 results in a streamlined deflection of the steam from the steam guide duct 5 into the steam distribution duct 8, which also prevents stagnant, erosion-prone steam zones in which condensate could form.
  • the bevel 24 ensures that condensate that collects on the top can drain off.
  • the condensate collecting plate 15 which, as can be seen from FIG. 1, is welded above the end plate 17 to a wall of the steam distribution channel, is composed of the elements 19 shown in FIGS. 6 and 7. After it has been assembled from the elements 19, a drip strip 25 is welded onto the free end, which prevents condensate from dripping down onto the end plate. In addition, it holds the elements 19 together at their free end.
  • the functional advantage of this type of desuperheater is that the steam entering the steam distribution duct 8 via the steam guide duct 5 is evenly distributed on its narrow sides 11 and flows outwards through the steam inlet openings 12, from where it then flows and condenses radially from the outside inwards into the tube bundle . Part of the steam flows down through the steam outlet slot 14. This slot also serves as drainage for condensate arising in the steam distribution channel 8.
  • this desuperheater provides a clear separation of the two flowing phases, the steam emerging from the steam distribution channel 8 and that of the upper parts of the condensation surface, i.e. H. the bundle of pipes, trickling water.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Air Supply (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Claims (4)

1. Réchauffeur vertical d'eau d'alimentation à haute pression, du type à collecteurs, avec un désurchauffeur (1 ) et un séparateur eau-vapeur dans la région d'un faisceau (6) de tubes du réchauffeur, dans lequel un corps (2) de désurchauffeur contient un collecteur (4) de sortie de l'eau d'alimentation, caractérisé en ce que le corps (2) de désurchauffeur est pourvu d'un canal (5) de guidage de la vapeur, dirigé vers le haut, qui entoure de façon sensiblement étanche à la vapeur, la dernière branche (7), vue dans le sens de circulation de l'eau d'alimentation, du faisceau (6) de tubes du réchauffeur, sur une partie de la longueur de cette branche, en ce qu'un conduit coudé (9) de déviation est raccordé à l'extrémité supérieure du canal (5) de guidage de la vapeur, en ce qu'il est prévu un canal (8) de distribution de la vapeur, dans lequel débouche le conduit coudé (9) de déviation et que celui-ci met en communication de façon conductrice avec le canal (5) de guidage de la vapeur, en ce que le canal (8) de distribution de la vapeur a la forme d'un caisson plat qui s'étend dans l'espace libre existant entre deux branches (7, 10» voisines du faisceau (6) de tubes du réchauffeur, et en ce que les deux faces étroites verticales (11 ) du canal (8) de distribution de la vapeur sont pourvues d'ouvertures (12) de sortie de la vapeur, réparties sur toute leur hauteur, et la face étroite horizontale inférieure comporte une fente (14) d'échappement de la vapeur, s'étendant sur toute sa longueur.
2. Réchauffeur d'eau d'alimentation à haute pression suivant la revendication 1, caractérisé en ce qu'une plaque d'obturation (17) forme la limite horizontale supérieure du conduit coudé (9) de déviation, plaque à travers laquelle les tubes (21) du faisceau (6) de tubes du réchauffeur s'étendent vers l'intérieur du canal (5) de guidage de la vapeur, et en ce que la plaque d'obturation (17) est composée d'éléments (18) en forme de barreaux, dont la largeur est égale à la distance séparant les plans médians de deux nappes de tubes voisines et dont les faces longitudinales verticales sont pourvues de cavités (20) semi-circulaires réparties sur leur longueur, le rayon de ces cavités étant égal au demi-diamètre extérieur des tubes (21 ).
3. Réchauffeur d'eau d'alimentation à haute pression suivant la revendication 2, caractérisé en ce que les éléments (18) de plaque d'obturation présentent un profil arrondi (23) à leur face tournée vers l'intérieur du canal (5) de guidage de la vapeur, en ce que la plaque d'obturation (17) est soudée, par son contour horizontal, aux tôles de paroi du canal (5) de guidage de la vapeur, et en ce que la plaque d'obturation (17) présente un chanfrein (14) à sa face supérieure.
4. Réchauffeur d'eau d'alimentation à haute pression suivant les revendications 1 et 3, caractérisé en ce qu'au-dessus de la plaque d'obturation (17) une plaque (15) de captage du condensat, composée d'éléments (19) en forme de barres, est soudée au canal (8) de distribution de la vapeur, la largeur des éléments (19) de la plaque de captage du condensat étant égale à la distance séparant les plans médians de deux nappes de tubes voisines et les faces longitudinales verticales de ces éléments présentant, réparties sur leur longueur, des cavités (20) semi-circulaires dont le rayon est égal au demi-diamètre extérieur des tubes (21 ), et en ce que les extrémités libres des éléments de la plaque de captage du condensat sont solidarisées par un larmier (25) soudé à leur face inférieure.
EP83200846A 1982-06-30 1983-06-09 Réchauffeur d'eau d'alimentation à haute pression disposé verticalement à construction à collecteur avec un désurchauffeur et un séparateur eau-vapeur Expired EP0097989B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83200846T ATE13463T1 (de) 1982-06-30 1983-06-09 Stehender hochdruckspeisewasservorwaermer in sammlerbauweise mit erhitzer und einer einrichtung zum trennen von dampf- und wasserphase.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3992/82 1982-06-30
CH399282 1982-06-30

Publications (2)

Publication Number Publication Date
EP0097989A1 EP0097989A1 (fr) 1984-01-11
EP0097989B1 true EP0097989B1 (fr) 1985-05-22

Family

ID=4267785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200846A Expired EP0097989B1 (fr) 1982-06-30 1983-06-09 Réchauffeur d'eau d'alimentation à haute pression disposé verticalement à construction à collecteur avec un désurchauffeur et un séparateur eau-vapeur

Country Status (7)

Country Link
US (1) US4461244A (fr)
EP (1) EP0097989B1 (fr)
JP (1) JPS5915703A (fr)
AT (1) ATE13463T1 (fr)
AU (1) AU553614B2 (fr)
DE (1) DE3360204D1 (fr)
ZA (1) ZA834712B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3461332D1 (en) * 1983-04-29 1987-01-02 Bbc Brown Boveri & Cie Feed-water heater
US8133049B1 (en) * 2008-03-07 2012-03-13 James Colman Sullivan Modular refractory support system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938588A (en) * 1973-10-18 1976-02-17 Westinghouse Electric Corporation Deaerating feedwater heater
CH573573A5 (fr) * 1974-07-29 1976-03-15 Bbc Brown Boveri & Cie
DE2820736A1 (de) * 1978-05-12 1979-11-15 Bbc Brown Boveri & Cie Speisewasservorwaermer
CH628410A5 (de) * 1978-05-31 1982-02-26 Bbc Brown Boveri & Cie Speisewasservorwaermer.

Also Published As

Publication number Publication date
DE3360204D1 (en) 1985-06-27
JPH0356362B2 (fr) 1991-08-28
JPS5915703A (ja) 1984-01-26
AU553614B2 (en) 1986-07-24
EP0097989A1 (fr) 1984-01-11
AU1616783A (en) 1984-01-05
ZA834712B (en) 1984-03-28
ATE13463T1 (de) 1985-06-15
US4461244A (en) 1984-07-24

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