EP0131670A1 - Feed-water preheater with a desuperheater, in particular for a thermal power plant - Google Patents

Feed-water preheater with a desuperheater, in particular for a thermal power plant Download PDF

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Publication number
EP0131670A1
EP0131670A1 EP83401463A EP83401463A EP0131670A1 EP 0131670 A1 EP0131670 A1 EP 0131670A1 EP 83401463 A EP83401463 A EP 83401463A EP 83401463 A EP83401463 A EP 83401463A EP 0131670 A1 EP0131670 A1 EP 0131670A1
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EP
European Patent Office
Prior art keywords
box
steam
tubes
desuperheating
heater
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
EP83401463A
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German (de)
French (fr)
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EP0131670B2 (en
EP0131670B1 (en
Inventor
Waldémar Bongard
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.)
Hamon Sobelco SA
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Hamon Sobelco SA
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8191422&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0131670(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hamon Sobelco SA filed Critical Hamon Sobelco SA
Priority to AT83401463T priority Critical patent/ATE25284T1/en
Priority to EP83401463A priority patent/EP0131670B2/en
Priority to DE8383401463T priority patent/DE3369553D1/en
Priority to AU27214/84A priority patent/AU565700B2/en
Priority to ZA845385A priority patent/ZA845385B/en
Publication of EP0131670A1 publication Critical patent/EP0131670A1/en
Publication of EP0131670B1 publication Critical patent/EP0131670B1/en
Application granted granted Critical
Publication of EP0131670B2 publication Critical patent/EP0131670B2/en
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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0131—Auxiliary supports for elements for tubes or tube-assemblies formed by plates

Definitions

  • the water supplying the boiler passes through a series of heaters generally consisting of a tube bundle, an outer casing and water boxes or collectors.
  • the heater (1) represents in Figs. 1 and 2 is a conventional heater. At the upper part of the heater 1 is an inlet 2 for superheated steam. This input is connected to a horizontal desuperheating chamber 3 by means of a distribution box 4. The box is traversed longitudinally by tubes such as 5. Vertical baffles are arranged inside the box 3. These baffles partly used to support the tubes 5.
  • the distribution box further comprises an upper horizontal wall 16, a vertical side wall 17 and a flat inclined side wall 18 close to the wall of the casing 11 of the heater and connecting to the horizontal bottom wall 19 of the box 13 via a vertical wall 20.
  • These tubes 21 are supported by a series of plates 22 orthogonal to the tubes. These plates are in one piece and have the shape of a rectangle with cut upper corners. These plates occupy the entire cross section of the box 13 with the exception of an area in the vicinity of the walls 18 and 20.

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  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Resistance Heating (AREA)
  • Beverage Vending Machines With Cups, And Gas Or Electricity Vending Machines (AREA)
  • Water Treatment By Sorption (AREA)
  • Beans For Foods Or Fodder (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Control Of Resistance Heating (AREA)
  • Greenhouses (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Air Supply (AREA)

Abstract

1. A feed-water heater comprising a chest (13) for de-superheating the steam and through which extends longitudinally a nest of tubes (21) through which the feed water flows, characterized in that the chest comprises a steam inlet extending substantially throughout the length of the de-superheating chest (13) and a steam outlet extending along the lateral side opposed to the steam inlet and along an equivalent length.

Description

La présente invention concerne un réchauffeur d'eau alimentaire comprenant une zone de désurchauffe notamment pour centrale électrique thermique.The present invention relates to a food water heater comprising a desuperheating zone, in particular for a thermal electric power station.

Dans une centrale électrique thermique, l'eau alimentant la chaudière passe au travers d'une série de réchauffeurs constitués généralement d'un faisceau tubulaire, d'une enveloppe extérieure et de boîtes à eau ou de collecteurs.In a thermal power plant, the water supplying the boiler passes through a series of heaters generally consisting of a tube bundle, an outer casing and water boxes or collectors.

La vapeur de chauffage pénètre dans l'enveloppe autour du faisceau tubulaire où elle finit par se condenser, cédant sa chaleur à l'eau alimentaire traversant les tubes.The heating steam enters the envelope around the tube bundle where it eventually condenses, giving up its heat to the food water passing through the tubes.

Lorsque la vapeur est surchauffée, le coefficient de transmission de chaleur de la vapeur aux tubes reste fort mauvais jusqu'au point où la condensation de la vapeur débute.When the steam is overheated, the heat transfer coefficient of the steam to the tubes remains very poor up to the point where the condensation of the steam begins.

Pour pallier cette mauvaise transmission de chaleur, il est connu d'augmenter la vitesse de la vapeur en la faisant circuler au travers d'une zone de désurchauffe contenue dans un caisson également traversé par les tubes du réchauffeur et comportant des chicanes servant aussi à supporter des tubes.To overcome this poor heat transmission, it is known to increase the speed of the steam by circulating it through a desuperheating zone contained in a box also crossed by the tubes of the heater and comprising baffles also serving to support tubes.

Ceci est réalisé, toutefois, au prix d'une aug- mentation de la perte de charge qui détériore les performances du réchauffeur et qui est d'autant plus importante que le nombre de chicanes est élevé.Cette perte de charge détermine la différence de pression que le caisson doit pouvoir supporter.This is achieved, however, at the cost of an increase in pressure drop which deteriorates the performance of the heater and which is all the more important as the number of baffles is high. This pressure drop determines the pressure difference that the box must be able to support.

L'entrée et la sortie de la vapeur-dans la zone.de desurchauffe sont des endroits particulièrement délicats car ils sont très localisés et ont une section réduite,ce qui entraîne un impact par la vapeur qui peut être dangereux pour les tubes qui y sont soumis (vibrations,érosion).The entry and exit of steam - in the overheating zone. Are particularly delicate places because they are very localized and have a reduced section, which results in an impact by steam which can be dangerous for the tubes which are there. subject (vibrations, erosion).

La présente invention vise à fournir un réchauffeur d'eau alimentaire comportant une zone de désurchauffe ne présentant pas les inconvénients de la technique antérieure.The present invention aims to provide a food water heater comprising a desuperheating zone which does not have the drawbacks of the prior art.

A cet effet, la présente invention a pour objet un réchauffeur d'eau alimentaire comportant un caisson de désurchauffe de la vapeur traversé longitudinalement par un faisceau de tubes parcourus par l'eau alimentaire, caractérisé en ce que le caisson comprend une entrée de vapeur s'étendant sur au moins une partie substantielle d'une de ses parois latérales.To this end, the subject of the present invention is a food water heater comprising a box for desuperheating steam traversed longitudinally by a bundle of tubes traversed by food water, characterized in that the box comprises a steam inlet s 'extending over at least a substantial part of one of its side walls.

L'entrée de vapeur s'étend avantageusement sur toute la longueur du caisson.The steam inlet advantageously extends over the entire length of the box.

En outre, la sortie de vapeur est avantageusement disposée du côté latéral opposé à l'entrée de vapeur et a une longueur équivalente.In addition, the steam outlet is advantageously arranged on the lateral side opposite to the steam inlet and has an equivalent length.

Le trajet de la vapeur a ainsi lieu orthogonalement aux tubes traversant le caisson.The vapor path thus takes place orthogonally to the tubes passing through the box.

Le guidage de la vapeur en courants parallèles peut en outre être assuré par des plaques d'un seul tenant supportant les tubes, disposées ortogonalement à ces tubes et occupant sensiblement la totalité de la section transversale du caisson, sans que cela provoque des pertes de charge supplémentaires. D'ailleurs, les plaques de support peuvent être rapprochées sans que cela augmente la vitesse de la vapeur, celle-ci étant conditionnée par la longueur totale du caisson.Steam guidance in parallel currents can also be ensured by integral plates supporting the tubes, arranged ortogonally to these tubes and occupying substantially the entire cross section of the box, without this causing pressure losses additional. Moreover, the support plates can be brought together without increasing the speed of the vapor, this being conditioned by the total length of the box.

Il est en outre avantageux que le réchauffeur soit dépourvu de tubes de condensation dans la zone de sortie de la vapeur du caisson, évitant ainsi tout obstacle lors de l'entrée dans la zone de condensation du réchauffeur.It is also advantageous for the heater to be free of condensation tubes in the zone for the outlet of the vapor from the box, thus avoiding any obstacle when entering the condensation zone of the heater.

Grâce à la présente invention, on évite les effets d'impact de la vapeur sur les tubes et par suite les phénomènes de vibration et d'érosion.Thanks to the present invention, the effects of impact of the steam on the tubes and consequently the phenomena of vibration and erosion are avoided.

L'invention sera exposée ci-après plus en détail en se référant aux dessins annexés, sur lesquels :

  • la Fig. 1 est une vue schématique partielle en coupe longitudinale d'un réchauffeur classique;
  • la Fig. 2 est une vue de dessus de la Fig. 1 représentant les chicanes;
  • la Fig. 3 est une vue partielle en coupe transversale d'un réchauffeur selon l'invention; et
  • la Fig. 4 est une vue en perspective du caisson de surchauffe présent dans le réchauffeur représenté sur la Fig. 3.
The invention will be explained below in more detail with reference to the accompanying drawings, in which:
  • Fig. 1 is a partial schematic view in longitudinal section of a conventional heater;
  • Fig. 2 is a top view of FIG. 1 representing the baffles;
  • Fig. 3 is a partial view in cross section of a heater according to the invention; and
  • Fig. 4 is a perspective view of the overheating chamber present in the heater shown in FIG. 3.

Le réchauffeur (1) représente sur les Fig. 1 et 2 est un réchauffeur classique . A la partie supérieure du réchauffeur 1 est disposée une entrée 2 de vapeur surchauffée. Cette entrée est reliée à un caisson de désurchauffe 3 horizontal par l'intermédiaire d'un caisson de distribution 4. Le caisson est traversé longitudinalement par des tubes tels que 5. Des chicanes verticales sont disposées à l'intérieur du caisson 3. Ces chicanes servent en partie à supporter les tubes 5.The heater (1) represents in Figs. 1 and 2 is a conventional heater. At the upper part of the heater 1 is an inlet 2 for superheated steam. This input is connected to a horizontal desuperheating chamber 3 by means of a distribution box 4. The box is traversed longitudinally by tubes such as 5. Vertical baffles are arranged inside the box 3. These baffles partly used to support the tubes 5.

Dans un tel caisson la vapeur subit une série de changements de direction qui contribuent à augmenter la perte de charge.In such a box the steam undergoes a series of changes of direction which contribute to increasing the pressure drop.

En outre l'entrée de la vapeur dans le caisson ainsi que sa sortie ont lieu dans des endroits très localisés entraînant des impacts néfastes par la vapeur.In addition, the entry of steam into the box as well as its exit take place in very localized locations causing harmful impacts by the steam.

Le réchauffeur 10 selon l'invention représenté sur la Fig. 3 comprend une enveloppe cylindrique 11.The heater 10 according to the invention shown in FIG. 3 comprises a cylindrical envelope 11.

A la partie supérieure du réchauffeur 10 est disposée une entrée verticale 12 de vapeur surchauffée Cette entrée 12 est reliée à un caisson de désurchauffe 13 disposé horizontalement par l'intermédiaire d'un caisson de distribution 14 disposé horizontalement.At the upper part of the heater 10 is disposed a vertical inlet 12 for superheated steam. This inlet 12 is connected to a desuperheating box 13 arranged horizontally by means of a distribution box 14 arranged horizontally.

Les caissons 13 et 14 ont des longueurs sensiblement égales entre elles et sont séparées par une paroi horizontale 15.The boxes 13 and 14 have lengths substantially equal to each other and are separated by a horizontal wall 15.

Le caisson de distribution comprend en outre une paroi horizontale supérieure 16,une.paroi latérale verticale.17 et une paroi latérale 18 inclinée plane proche de la paroi de l'enveloppe 11 du réchauffeur et se raccordant à la paroi inférieure horizontale 19 du caisson 13 par l'intermédiaire d'une paroi verticale 20.The distribution box further comprises an upper horizontal wall 16, a vertical side wall 17 and a flat inclined side wall 18 close to the wall of the casing 11 of the heater and connecting to the horizontal bottom wall 19 of the box 13 via a vertical wall 20.

Un espace est ménagé entre la paroi de séparation 15 et la paroi inclinée 18 sur toutes leurs longueurs pour permettre l'entrée de la vapeur dans le caisson de désurchauffe 13 à partir du caisson de distribution 14.A space is provided between the partition wall 15 and the inclined wall 18 over all their lengths to allow the entry of steam into the desuperheating box 13 from the distribution box 14.

La vapeur est ainsi introduite dans le caisson 13 le long de la paroi inclinée 18,puis passe entre les parois horizontales 15 et 19 où est disposé un faisceau de tubes 21, horizontaux et parallèles à l'axe de l'enveloppe cylindrique 11.Steam is thus introduced into the box 13 along the inclined wall 18, then passes between the horizontal walls 15 and 19 where a bundle of tubes 21 is arranged, horizontal and parallel to the axis of the cylindrical envelope 11.

Ces tubes 21 sont supportés par une série de plaques 22 orthogonales aux tubes.Ces plaques sont d'un seul tenant et ont la forme d'un rectangle à coins supérieurs coupés. Ces plaques occupent la totalité de la section transversale du caisson 13 à l'exception d'une zone au voisinage des parois 18 et 20.These tubes 21 are supported by a series of plates 22 orthogonal to the tubes. These plates are in one piece and have the shape of a rectangle with cut upper corners. These plates occupy the entire cross section of the box 13 with the exception of an area in the vicinity of the walls 18 and 20.

Ces plaques servent non seulement à supporter les tubes 21,mais également à guider la vapeur qui circule ainsi en courants parallèles entre les plaques 22.These plates serve not only to support the tubes 21, but also to guide the vapor which thus circulates in parallel currents between the plates 22.

La vapeur sort du caisson 13 au voisinage de la paroi de l'enveloppe cylindrique 11 dans une zone où le réchauffeur est dépourvu de tubes de condensation,l'ensemble des tubes de condensation tels que 23 étant disposés à un niveau inférieur au niveau de la paroi inférieure 19 du caisson 13.The vapor leaves the box 13 in the vicinity of the wall of the cylindrical envelope 11 in an area where the heater is devoid of condensation tubes, all the condensation tubes such as 23 being arranged at a level below the level of the bottom wall 19 of box 13.

Il apparaît,aussi bien au niveau de l'entrée de la vapeur dans le caisson 13 de désurchauffe qu'au niveau de la sortie de la vapeur de ce caisson,qu'il n'y a pas de localisation du passage de la vapeur.Les problèmes liés à une telle localisation sont ainsi évitésIt appears, both at the level of the entry of steam into the desuperheating box 13 and at the level of the outlet of the steam from this box, that there is no localization of the passage of steam. The problems associated with such a location are thus avoided

D'autre part,on évite également grâce à la présente invention les pertes de charge importantes que l'on avait dans la technique antérieure.On the other hand, it also avoids with the present invention the large pressure drops that were in the prior art.

Des descriptions du réchauffeur représentées sur les Fig.3 et 4 ne sont données qu'à titre d'exemple (avec une entrée de vapeur verticale et des tubes horizontaux). Toute autre orientation des réchauffeurs est possible.En particulier,l'entrée de vapeur peut être horizontale et les tubes verticaux.Descriptions of the heater shown in Figs. 3 and 4 are given by way of example only (with a vertical steam inlet and horizontal tubes). Any other orientation of the heaters is possible, in particular the steam inlet can be horizontal and the tubes vertical.

En outre,le caisson de distribution peut comporter à la place de la paroi inclinée 18 et de la paroi verticale 20,une paroi unique courbe se raccordant aux parois 16 et 19 et proche de la paroi de l'enveloppe 11.In addition, the distribution box can comprise, instead of the inclined wall 18 and the vertical wall 20, a single curved wall connecting to the walls 16 and 19 and close to the wall of the envelope 11.

Claims (6)

1. Réchauffeur d'eau alimentaire comportant un caisson (13) de désurchauffe de la vapeur traversé longitudinalement par un faisceau de tubes (21) parcourus par l'eau alimentaire, caractérisé en ce que le caisson comprend une entrée de vapeur s'étendant sur au moins une partie substantielle d'une de ses parois latérales.1. Food water heater comprising a box (13) for desuperheating steam traversed longitudinally by a bundle of tubes (21) through which the food water passes, characterized in that the box comprises a steam inlet extending over at least a substantial part of one of its side walls. 2. Réchauffeur selon la revendication 1, caractérisé en ce que l'entrée de vapeur s'étend sur toute la longueur du caisson (13) de désurchauffe.2. A heater according to claim 1, characterized in that the steam inlet extends over the entire length of the desuperheating box (13). 3. Réchauffeur selon la revendication 1 ou 2, caractérisé en ce qu'il comprend un caisson de distribution (14) s'étendant le long du caisson (13) de désurchauffe et répartissant la vapeur sur toute l'entrée de ce caisson (13).3. Heater according to claim 1 or 2, characterized in that it comprises a distribution box (14) extending along the box (13) of desuperheating and distributing the vapor over the entire inlet of this box (13 ). 4. Réchauffeur selon l'une quelconque des revendications 1 à 3, le caisson (13) comprend une sortie de vapeur s'étendant sur le côté latéral opposé à l'entrée de vapeur et sur une longueur équivalente.4. A heater according to any one of claims 1 to 3, the box (13) comprises a steam outlet extending on the lateral side opposite the steam inlet and over an equivalent length. 5. Réchauffeur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il est dépourvu de tubes de condensation (22)face à la zone de sortie de la vapeur du caisson (13) de désurchauffe.5. A heater according to any one of claims 1 to 4, characterized in that it is devoid of condensing tubes (22) facing the steam outlet zone of the desuperheating chamber (13). 6. Réchauffeur selon l'une quelconque des revendications 1 à 5, caractérisé en ce que les tubes (21) traversant le caisson (13) sont supportés par des plaques d'un seul tenant (22) et orthogonales à ces tubes (21).6. A heater according to any one of claims 1 to 5, characterized in that the tubes (21) passing through the box (13) are supported by integral plates (22) and orthogonal to these tubes (21) .
EP83401463A 1983-07-13 1983-07-13 Feed-water preheater with a desuperheater, in particular for a thermal power plant Expired - Lifetime EP0131670B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT83401463T ATE25284T1 (en) 1983-07-13 1983-07-13 FEED WATER PREHEATER WITH DESHEATER ESPECIALLY FOR THERMAL POWER PLANTS.
EP83401463A EP0131670B2 (en) 1983-07-13 1983-07-13 Feed-water preheater with a desuperheater, in particular for a thermal power plant
DE8383401463T DE3369553D1 (en) 1983-07-13 1983-07-13 Feed-water preheater with a desuperheater, in particular for a thermal power plant
AU27214/84A AU565700B2 (en) 1983-07-13 1984-04-24 Feed-water heater
ZA845385A ZA845385B (en) 1983-07-13 1984-07-12 Feed-water heater,in particular for a thermal electric power station including a de-superheating zone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83401463A EP0131670B2 (en) 1983-07-13 1983-07-13 Feed-water preheater with a desuperheater, in particular for a thermal power plant

Publications (3)

Publication Number Publication Date
EP0131670A1 true EP0131670A1 (en) 1985-01-23
EP0131670B1 EP0131670B1 (en) 1987-01-28
EP0131670B2 EP0131670B2 (en) 1991-01-02

Family

ID=8191422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401463A Expired - Lifetime EP0131670B2 (en) 1983-07-13 1983-07-13 Feed-water preheater with a desuperheater, in particular for a thermal power plant

Country Status (5)

Country Link
EP (1) EP0131670B2 (en)
AT (1) ATE25284T1 (en)
AU (1) AU565700B2 (en)
DE (1) DE3369553D1 (en)
ZA (1) ZA845385B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE365685C (en) * 1922-12-21 Friedrich Werle Feed water preheater for heating with exhaust steam
GB273803A (en) * 1926-04-07 1927-07-07 British Thomson Houston Co Ltd Improvements in and relating to feed water heating systems and apparatus therefor
GB931698A (en) * 1960-09-22 1963-07-17 Richardsons Westgarth & Co Improvements in or relating to feed-water heaters
FR2427550A1 (en) * 1978-05-31 1979-12-28 Bbc Brown Boveri & Cie SUPPLY WATER HEATER

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE365685C (en) * 1922-12-21 Friedrich Werle Feed water preheater for heating with exhaust steam
GB273803A (en) * 1926-04-07 1927-07-07 British Thomson Houston Co Ltd Improvements in and relating to feed water heating systems and apparatus therefor
GB931698A (en) * 1960-09-22 1963-07-17 Richardsons Westgarth & Co Improvements in or relating to feed-water heaters
FR2427550A1 (en) * 1978-05-31 1979-12-28 Bbc Brown Boveri & Cie SUPPLY WATER HEATER

Also Published As

Publication number Publication date
ATE25284T1 (en) 1987-02-15
AU2721484A (en) 1985-01-17
ZA845385B (en) 1985-02-27
EP0131670B2 (en) 1991-01-02
AU565700B2 (en) 1987-09-24
DE3369553D1 (en) 1987-03-05
EP0131670B1 (en) 1987-01-28

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