EP0123986B1 - Feed-water heater - Google Patents

Feed-water heater Download PDF

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Publication number
EP0123986B1
EP0123986B1 EP84104151A EP84104151A EP0123986B1 EP 0123986 B1 EP0123986 B1 EP 0123986B1 EP 84104151 A EP84104151 A EP 84104151A EP 84104151 A EP84104151 A EP 84104151A EP 0123986 B1 EP0123986 B1 EP 0123986B1
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EP
European Patent Office
Prior art keywords
steam
desuperheater
feed water
chambers
chamber
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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
EP84104151A
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German (de)
French (fr)
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EP0123986A1 (en
Inventor
Helmut Dipl.-Ing. Lang
Son Dr. Ing. Le Mong
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
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BBC Brown Boveri AG Switzerland
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Publication of EP0123986A1 publication Critical patent/EP0123986A1/en
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Expired 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 present invention relates to a feed water preheater of the horizontal type according to the first part of patent claim 1.
  • the feed water is gradually warmed up in preheaters before it enters the steam generator.
  • preheaters can be designed in a vertical or horizontal construction. If superheated steam is introduced into a feedwater preheater, part of the superheating heat can be used thermodynamically in a desuperheater if the steam is sufficiently superheated.
  • the steam is introduced into the desuperheater through a nozzle directed towards the tube bundle and is passed in countercurrent around the tube bundle and thereby heats the feed water flowing in the tubes, the heating taking place by convective means.
  • the tapping steam is passed through the superheating degree at high speed in the axial direction of the preheater through one or more chambers arranged in the desuperheater and then flows into the condensation zone of the preheater.
  • the steam pressure in the condensation part of the preheater is significantly lower than at the inlet of the desuperheater due to the flow losses that the steam suffers when it traverses until it leaves the desuperheater.
  • the steam outlet openings are arranged on the end face of the desuperheater facing the condensation part or on the last desuperheater support plate. At this point, part of the preheater tubes is unsupported, and the steam flows through the outlet openings directly to and along the condensation tubes.
  • Both embodiments show a horizontal preheater with built-in desuperheater at the feed water outlet and flooded condensate subcooler at the feed water inlet.
  • the desuperheating bundles are designated 1, the condensation bundles 2 and the supercooling bundles 3.
  • a steam jacket 5, only partially shown, is placed over the tube bundle.
  • the tubes 6 combined into the bundles mentioned are welded into the tube sheet 4.
  • the actual desuperheater is made by an allsei. tig closed sheet metal jacket 12 formed, which carries the steam inlet 7 on its top.
  • the supercooling bundle 3 is enclosed on all sides by a supercooling jacket 8. This is divided into individual chambers by means of baffles 9, the last of which carries the condensate outlet 10.
  • the cooler is flooded, the condensate level is designated 11.
  • the overheated bleed steam is conducted in the desuperheater at a certain speed in countercurrent to the feed water and releases its superheat.
  • the size of the desuperheater must be selected correctly so that the point at which the outer walls of the pipes reach the local saturation temperature and thus the condensation does not occur within the desuperheater. This means that, depending on the size of the desuperheater, the number of chambers required and thus the number of steam deflections is even or odd. This is crucial for the constructive design of the transition from the desuperheating zone to the condensation zone.
  • the solution according to the invention is now shown as it presents itself with an odd number of chambers. For the sake of simplicity, only one chamber is shown; it is understood, however, that even with three or five chambers, the same solution, which always affects only the last of the desuperheating chambers, is used.
  • baffles 14 adjoin the outlet openings. These baffles 14, which are supported in a suitable manner in the steam space, introduce the steam axially into the condensation zone.
  • FIGS. 2 and 2a show that solution which is used for an even number of deflection chambers.
  • a desuperheater is shown, which is divided into two chambers by means of a baffle 18.
  • the desuperheater bundle 1 When flowing into the first chamber from top to bottom resp. from the outside in, the desuperheater bundle 1 is in the last chamber from bottom to top resp. Flows through from inside to outside. Accordingly, any steam above the tube bundle 1 should be drawn off.
  • the sheet metal jacket 12 which is closed on all sides, is now provided in the rearmost chamber with lateral steam outlet openings 13, which in the example shown extend almost over the entire length of the chamber.
  • lateral steam outlet openings 13 which in the example shown extend almost over the entire length of the chamber.
  • the support plate 19 thus forms a further outlet opening 20 for the heated steam.
  • the parts of the preheater jacket opposite the side openings 13 are covered with plated sheets 16.

Description

Die vorliegende Erfindung betrifft einen Speisewasservorwärmer der liegenden Bauart gemäss dem ersten Teil des Patentanspruches 1.The present invention relates to a feed water preheater of the horizontal type according to the first part of patent claim 1.

In Wärmekraftanlagen wird das Speisewasser vor dem Eintritt in den Dampferzeuger stufenweise in Vorwärmern aufgewärmt. Diese Vorwärmer können in vertikaler oder horizontaler Bauweise ausgebildet sein. Wird in einen Speisewasservorwärmer überhitzter Dampf eingeleitet, so kann bei ausreichender Ueberhitzung des Dampfes ein Teil der Ueberhitzungswärme in einen Enthitzer thermodynamisch ausgenutzt werden. Der Dampf wird durch einen auf die Rohrbündel gerichteten Stutzen in den Enthitzer eingeleitet und im Gegenstrom um die Rohrbündel geführt und erwärmt dabei das in den Rohren strömende Speisewasser, wobei die Erwärmung auf konvektivem Wege erfolgt. Bei Enthitzern der horizontalen Bauart wird der Anzapfdampf entsprechend dem Ueberhitzungsgrad mit hoher Geschwindigkeit in Axialrichtung des Vorwärmers durch eine oder mehrere im Enthitzer angeordnete Kammern geleitet und strömt dann in die Kondensationszone des Vorwärmers. Der Dampfdruck im Kondensationsteil des Vorwärmers ist wegen der Strömungsverluste, die der Dampf beim Durchqueren bis zum Verlassen des Enthitzers erleidet, wesentlich niedriger als am Enthitzereintritt.In thermal power plants, the feed water is gradually warmed up in preheaters before it enters the steam generator. These preheaters can be designed in a vertical or horizontal construction. If superheated steam is introduced into a feedwater preheater, part of the superheating heat can be used thermodynamically in a desuperheater if the steam is sufficiently superheated. The steam is introduced into the desuperheater through a nozzle directed towards the tube bundle and is passed in countercurrent around the tube bundle and thereby heats the feed water flowing in the tubes, the heating taking place by convective means. In the case of desuperheaters of the horizontal type, the tapping steam is passed through the superheating degree at high speed in the axial direction of the preheater through one or more chambers arranged in the desuperheater and then flows into the condensation zone of the preheater. The steam pressure in the condensation part of the preheater is significantly lower than at the inlet of the desuperheater due to the flow losses that the steam suffers when it traverses until it leaves the desuperheater.

Bei den bekannten Ausbildungen (vgl. z. B. FR-A-2 433 706) von horizontalen Vorwärmern sind die Dampfaustrittsöffnungen an der dem Kondensationsteil zugewandten Stirnseite des Enthitzers bzw. an der letzten Enthitzerstützplatte angeordnet. An dieser Stelle ist ein Teil der Vorwärmerrohre nicht abgestützt, und der Dampf strömt durch die Austrittsöffnungen die Kondensationsrohre direkt an und an diesen entlang.In the known designs (cf. for example FR-A-2 433 706) of horizontal preheaters, the steam outlet openings are arranged on the end face of the desuperheater facing the condensation part or on the last desuperheater support plate. At this point, part of the preheater tubes is unsupported, and the steam flows through the outlet openings directly to and along the condensation tubes.

Dadurch entsteht zwischen dem aus dem Enthitzer austretenden Dampf und dem von den Kondensationsrohren herabfallenden Kondensat ein Kreuzstrom, wodurch insbesondere bei hohen Dampfgeschwindigkeiten das Kondensat vom Dampf mitgerissen und gegen die Kondensationsrohre geschleudert wird: Dadurch können Erosions-/Korrosionsschäden an den Kondensationsrohren auftreten.This creates a cross-flow between the steam escaping from the desuperheater and the condensate falling from the condensation pipes, causing the condensate to be entrained by the steam and thrown against the condensation pipes, especially at high steam speeds: Erosion / corrosion damage to the condensation pipes can occur.

Es ist Aufgabe der Erfindung, eine Enthitzerausbildung zu schaffen, bei welcher die Gefahr von Erosion-/Korrosionsschäden durch eine direkte Dampfanströmung der Kondensationsrohre vermieden wird.It is an object of the invention to provide a desuperheater design in which the risk of erosion / corrosion damage from a direct flow of steam to the condensation tubes is avoided.

Die vorgenannte Aufgabe wird erfindungsgemäss durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.According to the invention, the aforementioned object is achieved by the characterizing features of patent claim 1.

In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung schematisch dargestellt.Two exemplary embodiments of the invention are shown schematically in the drawing.

Es zeigt :

  • Figur 1 Einen Längsschnitt durch einen Speisewasservorwärmer mit ungerader Kammerzahl im Enthitzer ;
  • - Figur 1a einen Querschnitt durch den Vorwärmer entlang der Schnittlinie A-A in Fig. 1 ;
  • Figur 2 einen Längsschnitt durch einen Speisewasservorwärmer mit gerader Kammerzahl im Enthitzer :
  • Figur 2a einen Querschnitt durch den Vorwärmer entlang der Schnittlinie B-B in Fig. 2.
It shows :
  • Figure 1 shows a longitudinal section through a feed water preheater with an odd number of chambers in the desuperheater;
  • - Figure 1a shows a cross section through the preheater along the section line AA in Fig. 1;
  • FIG. 2 shows a longitudinal section through a feed water preheater with an even number of chambers in the desuperheater:
  • FIG. 2a shows a cross section through the preheater along the section line BB in FIG. 2.

Erfindungsunwesentliche Elemente wie beispielsweise die Wasserkammern, Stützplatten und dgl. sind nicht dargestellt. Die Strömungsrichtung des Heizdampfes ist mit Pfeilen bezeichnet.Elements not essential to the invention, such as the water chambers, support plates and the like, are not shown. The direction of flow of the heating steam is indicated by arrows.

Beide Ausführungsbeispiele zeigen jeweils einen horizontalen Vorwärmer mit eingebautem Enthitzer am Speisewasseraustritt und überflutetem Kondensatunterkühler am Speisewassereintritt.Both embodiments show a horizontal preheater with built-in desuperheater at the feed water outlet and flooded condensate subcooler at the feed water inlet.

In den Querschnitten der Fig. 1a und 2a sind die Enthitzungsbündel mit 1, die Kondensationsbündel mit 2 und die Unterkühlungsbündel mit 3 bezeichnet. Ueber die Rohrbündel ist ein nur teilweise dargestellter Dampfmantel 5 gestülpt. Die zu den genannten Bündeln zusammengefassten Rohre 6 sind im Rohrboden 4 eingeschweisst.In the cross sections of FIGS. 1a and 2a, the desuperheating bundles are designated 1, the condensation bundles 2 and the supercooling bundles 3. A steam jacket 5, only partially shown, is placed over the tube bundle. The tubes 6 combined into the bundles mentioned are welded into the tube sheet 4.

Der eigentliche Enthitzer wird von einem allsei. tig geschlossenen Blechmantel 12 gebildet, der an seiner Oberseite den Dampfeintritt 7 trägt. Das Unterkühlungsbündel 3 ist von einem Unterkühlungsmantel 8 allseitig umschlossen. Dieser ist mittels Schikanen 9 in einzelne Kammern unterteilt, wovon die letzte den Kondensataustritt 10 trägt. Der Kühler ist überflutet, das Kondensatniveau ist mit 11 bezeichnet.The actual desuperheater is made by an allsei. tig closed sheet metal jacket 12 formed, which carries the steam inlet 7 on its top. The supercooling bundle 3 is enclosed on all sides by a supercooling jacket 8. This is divided into individual chambers by means of baffles 9, the last of which carries the condensate outlet 10. The cooler is flooded, the condensate level is designated 11.

Der überhitzte Anzapfdampf wird im Enthitzer mit einer bestimmten Geschwindigkeit im Kreuzgegenstrom zum Speisewasser geführt und gibt darin seine Ueberhitzungswärme ab. Damit sich innerhalb des Enthitzers nicht jene Stelle befindet, an der die Aussenwände der Rohre die örtliche Sättigungstemperatur erreichen, und somit die Kondensation einsetzt, muss die Grösse des Enthitzers richtig gewählt sein. Dies führt dazu, dass je nach Enthitzergrösse die benötigte Kammerzahl und damit die Zahl der Dampfumlenkungen gerade oder ungerade ist. Dies ist entscheidend für die konstruktive Ausbildung des Uebergangs der Enthitzungszone in die Kondensationszone.The overheated bleed steam is conducted in the desuperheater at a certain speed in countercurrent to the feed water and releases its superheat. The size of the desuperheater must be selected correctly so that the point at which the outer walls of the pipes reach the local saturation temperature and thus the condensation does not occur within the desuperheater. This means that, depending on the size of the desuperheater, the number of chambers required and thus the number of steam deflections is even or odd. This is crucial for the constructive design of the transition from the desuperheating zone to the condensation zone.

In den Fig. 1 und 1a ist nun die erfindungsgemässe Lösung aufgezeigt, wie sie sich bei einer ungeraden Kammerzahl präsentiert. Der Einfachheit halber ist nur eine einzige Kammer dargestellt ; es versteht sich indessen, dass auch bei drei oder fünf Kammern die gleiche Lösung, welche immer nur die letzte der Enthitzungskammern betrifft, zur Anwendung gelangt.1 and 1a, the solution according to the invention is now shown as it presents itself with an odd number of chambers. For the sake of simplicity, only one chamber is shown; it is understood, however, that even with three or five chambers, the same solution, which always affects only the last of the desuperheating chambers, is used.

Der allseitig geschlossene Blechmantel 12, der den Enthitzer umgibt, ist in der letzten Kammer mit seitlichen Dampfaustrittsöffnungen 13 versehen, die sich über die ganze Kammerlänge erstrecken. Diese Oeffnungen 13 befinden sich unterhalb des Enthitzungsbündels 1, da bei oben eintretendem Dampf (7) in die erste Kammer und bei ungerader Kammerzahl die letzte Kammer ebenfalls von oben nach unten durchströmt wird. Um nun zu vermeiden, dass der seitlich austretende Dampf einerseits gegen den Dampfmantel 5 strömt und andererseits das stehende Kondensat (11) aufpeitscht, schliessen sich an die Austrittsöffnungen 13 Umlenkbleche 14 an. Diese Umlenkbleche 14, die sich auf geeignete Weise im Dampfraum abstützen, führen den Dampf axial in die Kondensationszone ein. Hierzu können sie in ihrer axialen Erstreckung etwas grösser bemessen sein als es die Austrittsöffnungen 13 sind, d. h. sie können über die letzte Umlenkkammer hinaus bis in die Kondensationszone hineinreichen. Bei der Abschlussstützplatte 15 des Enthitzers strömt lediglich eine geringe Dampfmenge durch die Ringspalte zwischen den Rohren 6 und den Plattenlöchern und gelangt damit in Rohrlängsrichtung in den freien Querschnitt des Rohrfeldes. Der Hauptteil des Dampfes strömt in den freien Raum um das Kondensationsbündel 2, das er nun mit minimaler Geschwindigkeit von aussen nach innen durchströmen kann. Die Umlenkbleche 14 weisen einen gewissen Abstand 17 zum Dampfmantel 5 auf. Dadurch kann ein Teil des Dampfes um das Umlenkblech 14 herum strömen und jene Teile des Kondensationsbündels 2 beaufschlagen, die unmittelbar unterhalb der Bodenfläche des Enthitzermantels 12 angeordnet sind.The sheet metal jacket 12, which is closed on all sides and which surrounds the desuperheater, is provided in the last chamber with lateral steam outlet openings 13 which extend over the entire length of the chamber. These openings 13 are located below the heat recovery bundle 1, since at the top steam (7) entering the first chamber and, if the number of chambers is odd, the last chamber is also flowed through from top to bottom. In order to prevent the steam escaping from the side from flowing against the steam jacket 5 on the one hand and whipping up the standing condensate (11) on the other hand, 13 baffles 14 adjoin the outlet openings. These baffles 14, which are supported in a suitable manner in the steam space, introduce the steam axially into the condensation zone. To this end, they can be dimensioned somewhat larger in their axial extent than the outlet openings 13, ie they can extend beyond the last deflection chamber into the condensation zone. In the end support plate 15 of the desuperheater, only a small amount of steam flows through the annular gaps between the tubes 6 and the plate holes and thus reaches the free cross section of the tube field in the longitudinal direction of the tube. The main part of the steam flows into the free space around the condensation bundle 2, which it can now flow through from outside to inside at a minimal speed. The baffle plates 14 are at a certain distance 17 from the steam jacket 5. As a result, part of the steam can flow around the deflection plate 14 and act on those parts of the condensation bundle 2 which are arranged directly below the bottom surface of the desuperheater casing 12.

In den Fig. 2 und 2a ist jene Lösung dargestellt, wie sie bei einer geraden Anzahl Umlenkkammern Anwendung findet. Gezeigt ist ein Enthitzer, der mittels einer Schikane 18 in zwei Kammern unterteilt ist.FIGS. 2 and 2a show that solution which is used for an even number of deflection chambers. A desuperheater is shown, which is divided into two chambers by means of a baffle 18.

Bei Einströmung in die erste Kammer von oben nach unten resp. von aussen nach innen wird hier in der letzten Kammer das Enthitzerbündel 1 von unten nach oben resp. von innen nach aussen quer durchströmt. Dementsprechend sollte jeder Dampf oberhalb des Rohrbündels 1 abgezogen werden.When flowing into the first chamber from top to bottom resp. from the outside in, the desuperheater bundle 1 is in the last chamber from bottom to top resp. Flows through from inside to outside. Accordingly, any steam above the tube bundle 1 should be drawn off.

Gemäss der Erfindung ist nun auch hier der allseitig geschlossene Blechmantel 12 in der hintersten Kammer mit seitlichen Dampfaustrittsöffnungen 13 versehen, die sich im gezeigten Beispiel fast über die ganze Kammerlänge erstrecken. Darüber hinaus bietet sich die Möglichkeit an, die Abschlussstützplatte 19 direkt oberhalb des Rohrbündels zu unterbrechen. Zusammen mit dem gekrümmten Oberteil des Blechmantels 12 bildet die Abstützplatte 19 somit eine weitere Austrittsöffnung 20 für den enthitzten Dampf. Um Erosionen des Dampfmantels 5 zu vermeiden, sind die den Seitenöffnungen 13 gegenüberliegenden Partien des Vorwärmermantels mit plattieren Blechen 16 belegt.According to the invention, the sheet metal jacket 12, which is closed on all sides, is now provided in the rearmost chamber with lateral steam outlet openings 13, which in the example shown extend almost over the entire length of the chamber. In addition, there is the possibility of interrupting the end support plate 19 directly above the tube bundle. Together with the curved upper part of the sheet metal jacket 12, the support plate 19 thus forms a further outlet opening 20 for the heated steam. In order to avoid erosions of the steam jacket 5, the parts of the preheater jacket opposite the side openings 13 are covered with plated sheets 16.

Claims (5)

1. Feed water preheater of the horizontal type with included desuperheater, whose sheet metal shell (12) is subdivided by means of baffles (18) into deflection chambers in which the steam from which heat has to be desuperheated flows through the desuperheater bundles (1) transversely before it is guided in the longitudinal direction of the tube into the condensation zone, characterised in that steam outlet'openings (13) are located at the side in the sheet metal shell (12) in the last deflection chamber, which steam outlet openings extend over the whole of the chamber length.
2. Feed water preheater according to Claim 1, characterised in that in the case of an uneven number of chamber, a deflection sheet (14) continues on from the steam outlet openings (13); which deflection sheet is located at a small lateral distance (17) from the steam shell (5) and extends at least over the same length as the openings (13).
3. Feed water preheater according to Claim 1, characterised in that in the case of an even number of chambers, plated sheets (16) of erosion resistant material are located opposite the steam outlet openings (13).
4. Feed water preheater according to Claim 1, characterised in that in the case of an even number of chambers, the final support plate (19) of the desuperheater is interrupted above the desuperheater bundle (1) and, together with the upper part of the sheet metal shell (12), forms an outlet opening (20) for the desuperheated steam.
EP84104151A 1983-04-29 1984-04-12 Feed-water heater Expired EP0123986B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH230883 1983-04-29
CH2308/83 1983-04-29

Publications (2)

Publication Number Publication Date
EP0123986A1 EP0123986A1 (en) 1984-11-07
EP0123986B1 true EP0123986B1 (en) 1986-11-12

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EP84104151A Expired EP0123986B1 (en) 1983-04-29 1984-04-12 Feed-water heater

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US (1) US4541366A (en)
EP (1) EP0123986B1 (en)
AU (1) AU560111B2 (en)
CA (1) CA1255169A (en)
DE (1) DE3461332D1 (en)
DK (1) DK159024C (en)
ES (1) ES8503817A1 (en)
HU (1) HU191759B (en)
PL (1) PL143578B1 (en)
RO (1) RO89632A (en)
ZA (1) ZA843150B (en)

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RU2674816C1 (en) * 2018-01-30 2018-12-13 Открытое акционерное общество "Таганрогский котлостроительный завод "Красный котельщик" (ОАО ТКЗ "Красный котельщик") Horizontal vapour-liquid heat exchanger

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US4858564A (en) * 1988-05-16 1989-08-22 Foster Wheeler Energy Corporation Feedwater heater with improved steam distribution
CH679280A5 (en) * 1989-10-31 1992-01-31 Asea Brown Boveri
US5377489A (en) * 1991-05-09 1995-01-03 Westinghouse Electric Corporation Internal moisture separation cycle for a low pressure turbine
DE19511264C2 (en) * 1995-03-27 1998-06-10 Siemens Ag Heat exchanger
RU2489645C1 (en) * 2011-12-27 2013-08-10 Открытое акционерное общество "Российский концерн по производству электрической и тепловой энергии на атомных станциях" (ОАО "Концерн Росэнергоатом") Steam and water heater
RU2670999C2 (en) * 2016-05-11 2018-10-29 Андрей Витальевич Билан Multipass horizontal network heater
RU177310U1 (en) * 2017-08-17 2018-02-15 Открытое акционерное общество "Научно-производственное объединение по исследованию и проектированию энергетического оборудования им. И.И. Ползунова" (ОАО "НПО ЦКТИ") Horizontal heater

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CH628410A5 (en) * 1978-05-31 1982-02-26 Bbc Brown Boveri & Cie Feed water preheater.
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JPS5914682B2 (en) * 1980-09-29 1984-04-05 株式会社日立製作所 feed water heater
ATE13463T1 (en) * 1982-06-30 1985-06-15 Bbc Brown Boveri & Cie STANDING HIGH PRESSURE FEED WATER PREHEATER IN RECEIVER CONSTRUCTION WITH HEATER AND A DEVICE TO SEPARATE THE STEAM AND WATER PHASE.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2674816C1 (en) * 2018-01-30 2018-12-13 Открытое акционерное общество "Таганрогский котлостроительный завод "Красный котельщик" (ОАО ТКЗ "Красный котельщик") Horizontal vapour-liquid heat exchanger

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DK159024B (en) 1990-08-20
DK159024C (en) 1991-01-28
EP0123986A1 (en) 1984-11-07
US4541366A (en) 1985-09-17
HUT38141A (en) 1986-04-28
PL247444A1 (en) 1985-01-02
AU560111B2 (en) 1987-03-26
RO89632A (en) 1986-06-30
DK209584A (en) 1984-10-30
DE3461332D1 (en) 1987-01-02
AU2729684A (en) 1984-11-01
PL143578B1 (en) 1988-02-29
HU191759B (en) 1987-04-28
ZA843150B (en) 1984-12-24
ES532002A0 (en) 1985-03-01
DK209584D0 (en) 1984-04-26
ES8503817A1 (en) 1985-03-01
CA1255169A (en) 1989-06-06

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