EP0357590B1 - Waste heat boiler - Google Patents

Waste heat boiler Download PDF

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Publication number
EP0357590B1
EP0357590B1 EP89890214A EP89890214A EP0357590B1 EP 0357590 B1 EP0357590 B1 EP 0357590B1 EP 89890214 A EP89890214 A EP 89890214A EP 89890214 A EP89890214 A EP 89890214A EP 0357590 B1 EP0357590 B1 EP 0357590B1
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EP
European Patent Office
Prior art keywords
heating surface
evaporator heating
circulation
collector
down pipe
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Expired - Lifetime
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EP89890214A
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German (de)
French (fr)
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EP0357590A1 (en
Inventor
Kurt Budin
Georg Dipl.-Ing. Dr. Gasteiger
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AE ENERGIETECHNIK GMBH
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Austrian Energy and Environment SGP Waagner Biro GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/04—Steam boilers of forced-flow type of combined-circulation type, i.e. in which convection circulation due to the difference in specific gravity between cold and hot water is promoted by additional measures, e.g. by injecting pressure-water temporarily

Definitions

  • the invention relates to a waste heat steam generator in use behind a gas turbine, according to the preamble of claims 1, 2 and 3.
  • a waste heat steam generator is known from US-A-2 031 423.
  • Waste heat steam generators are usually designed in two types, e.g. with natural circulation or forced circulation.
  • natural circulation the evaporator bundles are arranged in a horizontal flue gas duct in a vertical installation position and connected to at least one steam drum via downpipes and riser pipes.
  • the heating surface tubes from the superheater and economizer or from various other heating surfaces, if present, can be designed in a horizontal and or vertical arrangement.
  • the heating surface pipes from the superheater, evaporator and economizer or other heating surfaces, if present, are arranged in a vertical flue gas duct in a horizontal installation position.
  • the evaporator heating surfaces are connected to at least one steam drum via downpipes, circulation pumps and risers.
  • the circulation pumps which ensure the water circulation in the evaporator, are associated with a cost and labor in the construction of the system and also form a disruptive factor.
  • the object of the present invention is to provide a waste heat steam generator, which is a gas turbine and has the advantage that the water circulation is ensured without the use of a circulation pump.
  • the present waste heat steam generator is provided in a vertical version with an evaporator heating surface 1, a drum 2, a down pipe system 3, a riser pipe system 4 and a feed line 5 with a feed pump 6.
  • the drum 2 is connected on the water side to the downpipe system 3, which opens into an inlet header 7 via a lower stroke 29, to which the pipe system of the evaporator heating surface 1 is connected.
  • the term "lower stroke” is to be understood so that the downpipes 3 are led down to a level which is lower than the inlet header 7 of the evaporator heating surface 1, so that the water flows from the bottom up before it enters the collector.
  • the "lower stroke” can thus be understood as a kind of water bag.
  • the evaporator heating surface 1 is connected on the outlet side to an outlet header 8, into which the riser pipe system 4 opens, which is connected to the steam chamber of the drum 2 via an overtravel 9, or directly via a pipe system 10 to the water chamber 11 of the drum 2.
  • overstroke is to be understood such that the steam / water mixture is introduced into the drum 2 higher than the level of the water in it.
  • the feed pump 6 promotes the like from a feed water tank. Via the feed line 5 water into the water space 11 for make-up.
  • an injector 12 is provided in the downpipe system 3, which is connected to a shut-off device 14, e.g. a valve, a tap or the like.
  • a shut-off device 14 e.g. a valve, a tap or the like.
  • provided line 13 is connected to the feed line 5.
  • a second variant of claim 1 provides a pump 16 in a bypass line 15 which connects the downpipe system 3 with an injector 17 Riser pipe system 4 connects.
  • This pump 16 feeds boiler water into the riser pipe system 4 in the direction of its flow, as a result of which the water circulation is dynamically excited in the start-up phase and the excitation can be switched off again after switching off the pump 16 after the stationary circulation state has been reached.
  • a third variant can be in the riser pipe system 4 from a line 18 in which a shut-off device 19, e.g. a valve, a tap or the like. steam, nitrogen or another gas.
  • a shut-off device 19 e.g. a valve, a tap or the like. steam, nitrogen or another gas. This measure increases the thermosiphon effect and ensures an acceleration of the circulation process in the start-up phase.
  • a fourth variant sees one through a shut-off device 21, e.g. a valve, a tap or the like.
  • lockable line 22 which connects the inlet header 7 to the outlet header 8 of the evaporator heating surface 1.
  • the installation of such a lockable connecting line 22 between at least one inlet and at least one outlet header 7 or 8 of the evaporator heating surfaces 1 ensures that when the first vapor bubbles are formed, they stimulate the water circulation in the start-up phase by direct discharge into the riser pipe system 4.
  • thermosiphon effect of the water circulation can be advantageously influenced by suitable dimensioning of the pipe system of the evaporator heating surfaces 1 and of the downcomer and riser pipe systems 3 and 4.
  • the waste heat boiler design can be retained in the known embodiment and the use of circulation pumps in the circuit can be dispensed with.
  • the evaporator heating surface 1 is arranged in a horizontal arrangement in an exhaust gas duct 23, into which the exhaust gases of one or more gas turbines flow in the direction of arrow A, above and / or below the evaporator heating surface 1, a superheater heating surface 24 can also be provided in a horizontal arrangement, which is connected on the inlet side to the steam chamber 26 of the drum 2 via an inlet collector 30 and a line 25 and on the outlet side leads to the turbine via an outlet collector 31 and a line 27 provided with a shut-off device 28 .

Description

Die Erfindung betrifft einen Abhitze-Dampferzeuger in der Verwendung hinter einer Gasturbine, nach dem Oberbegriff der Patentansprüche 1, 2 und 3. Ein solcher Abhitze-Dampferzenger ist aus US-A- 2 031 423 bekannt.The invention relates to a waste heat steam generator in use behind a gas turbine, according to the preamble of claims 1, 2 and 3. Such a waste heat steam generator is known from US-A-2 031 423.

Üblicherweise werden Abhitze-Dampferzeuger in zwei Bauarten ausgeführt u.zw. mit Naturumlauf oder Zwangsumlauf. Beim Naturumlauf sind die Verdampferbündel in einem horizontalen Rauchgaskanal in vertikaler Einbaulage angeordnet und über Fallrohre und Steigrohre mit mindestens einer Dampftrommel verbunden. Hierbei können die Heizflächenrohre vom Überhitzer und Economizer bzw. von diversen anderen Heizflächen, falls vorhanden, in waagrechter und oder senkrechter Anordnung ausgeführt sein.Waste heat steam generators are usually designed in two types, e.g. with natural circulation or forced circulation. In natural circulation, the evaporator bundles are arranged in a horizontal flue gas duct in a vertical installation position and connected to at least one steam drum via downpipes and riser pipes. The heating surface tubes from the superheater and economizer or from various other heating surfaces, if present, can be designed in a horizontal and or vertical arrangement.

Beim Zwangsumlauf sind die Heizflächenrohre vom Überhitzer, Verdampfer und Economizer bzw. andere Heizflächen, falls vorhanden, in einem vertikalen Rauchgaskanal in horizontaler Einbaulage angeordnet. Die Verdampferheizflächen sind über Fallrohre, Umwälzpumpen und Steigrohre mit mindestens einer Dampftrommel verbunden. Die Umwälzpumpen, welche den Wasserumlauf im Verdampfer sicherstellen, sind mit einem Kosten- und Arbeitsaufwand bei der Erstellung der Anlage verbunden und bilden außerdem einen Störfaktor.In the case of forced circulation, the heating surface pipes from the superheater, evaporator and economizer or other heating surfaces, if present, are arranged in a vertical flue gas duct in a horizontal installation position. The evaporator heating surfaces are connected to at least one steam drum via downpipes, circulation pumps and risers. The circulation pumps, which ensure the water circulation in the evaporator, are associated with a cost and labor in the construction of the system and also form a disruptive factor.

Aufgabe der vorliegenden Erfindung ist die Schaffung eines Abhitze-Dampferzeugers, welcher einer Gasturbine nachgestellt ist und den Vorteil hat, daß der Wasserumlauf ohne Verwendung einer Umwälzpumpe sichergestellt wird.The object of the present invention is to provide a waste heat steam generator, which is a gas turbine and has the advantage that the water circulation is ensured without the use of a circulation pump.

Diese Aufgabe wird bei einem Abhitze-Dampferzeuger der eingangs erwähnten Art durch die kennzeichnenden Merkmale des unabhängigen Anspruchs 1 gelöst, sowie alternativ durch die kennzeichnenden Merkmale der unabhängigen Ansprüche 2, bzw 3.This object is achieved in a waste heat steam generator of the type mentioned at the outset by the characterizing features of independent claim 1, and alternatively by the characterizing features of independent claims 2 and 3 respectively.

Die Erfindungen werden anhand der Zeichnung näher erläutert, in welcher ein Ausführungsbeispiel des erfindungsgemäßen Abhitze-Dampferzeugers schematisch dargestellt ist.The inventions are explained in more detail with reference to the drawing, in which an embodiment of the waste heat steam generator according to the invention is shown schematically.

Der gegenständliche Abhitze-Dampferzeuger ist in vertikaler Ausführung mit einer Verdampferheizfläche 1, einer Trommel 2, einem Fallrohrsystem 3, einem Steigrohrsystem 4, sowie einer Speiseleitung 5 mit einer Speisepumpe 6 versehen. Die Trommel 2 ist wasserseitig an das Fallrohrsystem 3 angeschlossen, welches über einen Unterhub 29 in einen Eintrittssammler 7 mündet, an den das Rohrsystem der Verdampferheizfläche 1 angeschlossen ist. Der Begriff "Unterhub" ist so zu verstehen, daß die Fallrohre 3 nach unten bis zu einer Ebene geführt sind, die tiefer gelegen ist als der Eintrittssammler 7 der Verdampferheizfläche 1, sodaß das Wasser von unten nach oben strömt bevor es in den Sammler eintritt. Der "Unterhub" kann somit als eine Art Wassersack verstanden werden. Die Verdampferheizfläche 1 ist ausgangsseitig an einen Austrittssammler 8 angeschlossen, in welchen das Steigrohrsystem 4 mündet, das mit dem Dampfraum der Trommel 2 über einen Überhub 9, oder direkt über ein Rohrsystem 10 mit dem Wasserraum 11 der Trommel 2 verbunden ist. Der Begriff "Überhub" ist so zu verstehen, daß das Dampfwassergemisch höher als der Spiegel des Wassers in der Trommel 2 in diese eingeführt wird.The present waste heat steam generator is provided in a vertical version with an evaporator heating surface 1, a drum 2, a down pipe system 3, a riser pipe system 4 and a feed line 5 with a feed pump 6. The drum 2 is connected on the water side to the downpipe system 3, which opens into an inlet header 7 via a lower stroke 29, to which the pipe system of the evaporator heating surface 1 is connected. The term "lower stroke" is to be understood so that the downpipes 3 are led down to a level which is lower than the inlet header 7 of the evaporator heating surface 1, so that the water flows from the bottom up before it enters the collector. The "lower stroke" can thus be understood as a kind of water bag. The evaporator heating surface 1 is connected on the outlet side to an outlet header 8, into which the riser pipe system 4 opens, which is connected to the steam chamber of the drum 2 via an overtravel 9, or directly via a pipe system 10 to the water chamber 11 of the drum 2. The term "overstroke" is to be understood such that the steam / water mixture is introduced into the drum 2 higher than the level of the water in it.

Die Speisepumpe 6 fördert aus einem Speisewasserbehälter od.dgl. über die Speiseleitung 5 Wasser in den Wasserraum 11 zur Nachspeisung.The feed pump 6 promotes the like from a feed water tank. Via the feed line 5 water into the water space 11 for make-up.

Zur Beschleunigung des Wasserumlaufes in der Anfahrphase können als Anfahrhilfe diverse Systeme eingesetzt werden:Various systems can be used as a starting aid to accelerate the water circulation during the start-up phase:

Nach einer ersten Variante des Anspruchs 1 ist im Fallrohrsystem 3 ein Injektor 12 vorgesehen, welcher über eine mit einem Absperrorgan 14, z.B. einem Ventil, einem Hahn od.dgl. versehene Leitung 13 an die Speiseleitung 5 angeschlossen ist. Durch Einspeisung eines Teilstromes aus der Speiseleitung 5 in das Fallrohrsystem 3 in der Strömungsrichtung im Fallrohrsystem 3 wird eine dynamische Anregung des Wasserumlaufes in der Anfahrphase sichergestellt.According to a first variant of claim 1, an injector 12 is provided in the downpipe system 3, which is connected to a shut-off device 14, e.g. a valve, a tap or the like. provided line 13 is connected to the feed line 5. By feeding a partial flow from the feed line 5 into the down pipe system 3 in the flow direction in the down pipe system 3, a dynamic excitation of the water circulation in the start-up phase is ensured.

Eine zweite Variante des Anspruchs 1 sieht eine Pumpe 16 in einer Nebenstromleitung 15 vor, welche das Fallrohrsystem 3 mit einem Injektor 17 im Steigrohrsystem 4 verbindet. Diese Pumpe 16 speist Kesselwasser, in das Steigrohrsystem 4 in deren Strömungsrichtung ein, wodurch der Wasserumlauf in der Anfahrphase dynamisch angeregt wird und nach Erreichen des stationären Umlaufzustandes durch Abschalten der Pumpe 16 die Anregung wieder ausgeschaltet werden kann.A second variant of claim 1 provides a pump 16 in a bypass line 15 which connects the downpipe system 3 with an injector 17 Riser pipe system 4 connects. This pump 16 feeds boiler water into the riser pipe system 4 in the direction of its flow, as a result of which the water circulation is dynamically excited in the start-up phase and the excitation can be switched off again after switching off the pump 16 after the stationary circulation state has been reached.

Im Rahmen der Erfindung besteht auch die Möglichkeit, die Leitung 15 an die Leitung 5 anzuschließen, in welchem Fall Speisewasser eingeführt wird, wobei die Pumpe 16 entfallen kann. Natürlich kann Wasser auch aus jedem anderen System genommen werden.Within the scope of the invention there is also the possibility of connecting the line 15 to the line 5, in which case feed water is introduced, it being possible to dispense with the pump 16. Of course, water can also be taken from any other system.

Gemäß einer dritten Variante (Anspruch 2) kann in das Steigrohrsystem 4 aus einer Leitung 18, in welcher sich ein Absperrorgan 19, z.B. ein Ventil, ein Hahn od.dgl. befindet, Dampf, Stickstoff oder ein anderes Gas eingeblasen werden. Durch diese Maßnahme wird die Thermosyphonwirkung verstärkt und eine Beschleunigung des Umlaufvorganges in der Anfahrphase sichergestellt.According to a third variant (claim 2) can be in the riser pipe system 4 from a line 18 in which a shut-off device 19, e.g. a valve, a tap or the like. steam, nitrogen or another gas. This measure increases the thermosiphon effect and ensures an acceleration of the circulation process in the start-up phase.

Eine vierte Variante (Anspruch 3) sieht eine durch ein Absperrorgan 21, z.B. ein Ventil, einen Hahn od.dgl. absperrbare Leitung 22 vor, welche den Eintrittssammler 7 mit dem Austrittssammler 8 der Verdampferheizfläche 1 verbindet. Der Einbau einer solchen absperrbaren Verbindungsleitung 22 zwischen mindestens einem Ein- und mindestens einem Austrittssammler 7 bzw. 8 der Verdampferheizflächen 1 stellt sicher, daß bei Bildung der ersten Dampfblasen diese durch direkte Ableitung in das Steigrohrsystem 4 den Wasserumlauf in der Anfahrphase anregen.A fourth variant (claim 3) sees one through a shut-off device 21, e.g. a valve, a tap or the like. lockable line 22 which connects the inlet header 7 to the outlet header 8 of the evaporator heating surface 1. The installation of such a lockable connecting line 22 between at least one inlet and at least one outlet header 7 or 8 of the evaporator heating surfaces 1 ensures that when the first vapor bubbles are formed, they stimulate the water circulation in the start-up phase by direct discharge into the riser pipe system 4.

Durch geeignete Dimensionierung des Rohrsystems der Verdampferheizflächen 1 und des Fall- und des Steigrohrsystems 3 bzw. 4 kann die Thermosyphonwirkung des Wasserumlaufes vorteilhaft beeinflußt werden.The thermosiphon effect of the water circulation can be advantageously influenced by suitable dimensioning of the pipe system of the evaporator heating surfaces 1 and of the downcomer and riser pipe systems 3 and 4.

Außerdem ist es vorteilhaft für die Verdampferheizfläche 1, wie in der Zeichnung angedeutet ist, Rippenrohre zu verwenden.It is also advantageous for the evaporator heating surface 1, as indicated in the drawing, to use finned tubes.

Durch den Unterhub 29 und vorzugsweise auch den Überhub 9 und bzw. oder die direkte Verbindung des Steigrohrsystems 4 mit dem Wasserraum 11 der Trommel 2 kann die Abhitzekesselausführung in der bekannten Ausführungsform beibehalten werden und auf die Verwendung von Umwälzpumpen im Kreislauf verzichtet werden.Through the lower stroke 29 and preferably also the overstroke 9 and / or the direct connection of the riser pipe system 4 with the water space 11 of the drum 2, the waste heat boiler design can be retained in the known embodiment and the use of circulation pumps in the circuit can be dispensed with.

Für die Verwendung des Abhitze-Dampferzeugers hinter Gasturbinen wird die Verdampferheizfläche 1, wie dargestellt, in horizontaler Anordnung in einem Abgaskanal 23 angeordnet, in welchen die Abgase einer oder mehrerer Gasturbinen in Richtung des Pfeiles A einströmen, wobei über und bzw. oder unter der Verdampferheizfläche 1 eine Überhitzerheizfläche 24 ebenfalls in horizontaler Anordnung vorgesehen sein kann, die eingangsseitig über einen Eintrittssammler 30 und eine Leitung 25 mit dem Dampfraum 26 der Trommel 2 in Verbindung steht und ausgangsseitig über einen Austrittssammler 31 und eine mit einem Absperrorgan 28 versehene Leitung 27 zur Turbine führt.For the use of the waste heat steam generator behind gas turbines, the evaporator heating surface 1, as shown, is arranged in a horizontal arrangement in an exhaust gas duct 23, into which the exhaust gases of one or more gas turbines flow in the direction of arrow A, above and / or below the evaporator heating surface 1, a superheater heating surface 24 can also be provided in a horizontal arrangement, which is connected on the inlet side to the steam chamber 26 of the drum 2 via an inlet collector 30 and a line 25 and on the outlet side leads to the turbine via an outlet collector 31 and a line 27 provided with a shut-off device 28 .

Claims (3)

  1. A waste-heat steam generator for use downstream of a gas turbine, at least one cylinder (2) being provided, which forms part of a circulation system comprising at least one down pipe (3), at least one evaporator heating surface (1) and at least one ascending pipe (4), the down pipe (3) extending downwards to a level which is lower than the inlet collector (7) of the evaporator heating surface (1), so that the water flows from below upwards before entering the collector (7), the evaporator heating surface (1) is horizontally arranged and the circulation is natural circulation, characterised in that at least one injector (12, 17) is provided as a starting aid, which solely during the start-up phase feeds a partial flow of water with the desired direction of flow into the down pipe system (3) and/or the ascending pipe system (4).
  2. A waste-heat steam generator for use downstream of a gas turbine, at least one cylinder (2) being provided, which forms part of a circulation system comprising at least one down pipe (3), at least one evaporator heating surface (1) and at least one ascending pipe (4), the down pipe (3) extending downwards to a level which is lower than the inlet collector (7) of the evaporator heating surface (1), so that the water flows from below upwards before entering the collector (7), the evaporator heating surface (1) is horizontally arranged and the circulation is natural circulation, characterised in that a device is provided as a starting aid for feeding steam, a steam-water mixture, gases such as nitrogen or the like, into the ascending pipe system (4).
  3. A waste-heat steam generator for use downstream of a gas turbine, at least one drum (2) being provided, which forms part of a circulation system comprising at least one down pipe (3), at least one evaporator heating surface (1) and at least one ascending pipe (4), the down pipe (3) extending downwards to a level which is lower than the inlet collector (7) of the evaporator heating surface (1), so that the water flows from below upwards before entering the collector (7), the evaporator heating surface (1) is horizontally arranged and the circulation is natural circulation, characterised in that a blockable connection line (22) is provided as a starting aid between at least one inlet and outlet collector (7 or 8) in each case of the evaporator heating surface (1).
EP89890214A 1988-08-29 1989-08-18 Waste heat boiler Expired - Lifetime EP0357590B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2116/88 1988-08-29
AT2116/88A AT392683B (en) 1988-08-29 1988-08-29 HEAT STEAM GENERATOR

Publications (2)

Publication Number Publication Date
EP0357590A1 EP0357590A1 (en) 1990-03-07
EP0357590B1 true EP0357590B1 (en) 1993-07-21

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EP89890214A Expired - Lifetime EP0357590B1 (en) 1988-08-29 1989-08-18 Waste heat boiler

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EP (1) EP0357590B1 (en)
KR (1) KR0142330B1 (en)
CN (1) CN1018574B (en)
AT (1) AT392683B (en)
DE (1) DE58904955D1 (en)
DK (1) DK169109B1 (en)
ES (1) ES2043114T3 (en)
FI (1) FI93055C (en)

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DE19524727A1 (en) * 1995-07-07 1997-01-09 Nem Bv Natural heat recovery steam generator
RU2491477C1 (en) * 2012-02-08 2013-08-27 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Steam generator plant
WO2015140361A1 (en) 2014-03-21 2015-09-24 Foster Wheeler Energia, S.L.U. Evaporation cycle of a natural circulation steam generator in connection with a vertical duct for upward gas flow

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DE19534802A1 (en) * 1995-09-20 1997-04-10 Nem Bv Heat recovery steam generators, particularly when used behind a gas turbine
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US9518731B2 (en) 2011-03-23 2016-12-13 General Electric Technology Gmbh Method and configuration to reduce fatigue in steam drums
US20120247406A1 (en) * 2011-03-28 2012-10-04 Alstom Technology Ltd. Method of controlling drum temperature transients
WO2014108980A1 (en) 2013-01-10 2014-07-17 パナソニック株式会社 Rankine cycle device and cogeneration system
US9982881B2 (en) * 2015-04-22 2018-05-29 General Electric Technology Gmbh Method and system for gas initiated natural circulation vertical heat recovery steam generator
EP3835653A1 (en) 2019-12-11 2021-06-16 Siemens Aktiengesellschaft Hot evaporator refilling

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19524727A1 (en) * 1995-07-07 1997-01-09 Nem Bv Natural heat recovery steam generator
DE19524727C2 (en) * 1995-07-07 1998-04-09 Nem Bv Natural heat recovery steam generator
RU2491477C1 (en) * 2012-02-08 2013-08-27 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Steam generator plant
WO2015140361A1 (en) 2014-03-21 2015-09-24 Foster Wheeler Energia, S.L.U. Evaporation cycle of a natural circulation steam generator in connection with a vertical duct for upward gas flow

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Publication number Publication date
CN1018574B (en) 1992-10-07
ES2043114T3 (en) 1993-12-16
FI893754A0 (en) 1989-08-09
AT392683B (en) 1991-05-27
KR0142330B1 (en) 1998-07-01
FI93055B (en) 1994-10-31
ATA211688A (en) 1990-10-15
DK422389A (en) 1990-03-01
DK169109B1 (en) 1994-08-15
FI93055C (en) 1995-02-10
DK422389D0 (en) 1989-08-28
DE58904955D1 (en) 1993-08-26
FI893754A (en) 1990-03-01
KR900003582A (en) 1990-03-26
EP0357590A1 (en) 1990-03-07
CN1041438A (en) 1990-04-18

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