EP0856126B1 - Method for Producing Gland Steam, and corresponding Steam Power Station - Google Patents
Method for Producing Gland Steam, and corresponding Steam Power Station Download PDFInfo
- Publication number
- EP0856126B1 EP0856126B1 EP96945485A EP96945485A EP0856126B1 EP 0856126 B1 EP0856126 B1 EP 0856126B1 EP 96945485 A EP96945485 A EP 96945485A EP 96945485 A EP96945485 A EP 96945485A EP 0856126 B1 EP0856126 B1 EP 0856126B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steam
- turbine
- drum
- saturated
- sealing
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 2
- 210000004907 gland Anatomy 0.000 title 1
- 229920006395 saturated elastomer Polymers 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 5
- 238000013021 overheating Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/002—Steam conversion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/007—Preventing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/005—Steam superheating characterised by heating method the heat being supplied by steam
Definitions
- the invention relates to a method for producing Sperrdamf steam power plant with a from saturated steam. It continues to focus on one Device for performing this method and use of the barrier steam generated by this method.
- saturated steam When water evaporates, it evaporates by adding heat this in whole or in part.
- the resulting one Steam is in the thermal with the remaining water Equilibrium and is usually referred to as saturated steam.
- saturated steam may contain considerable amounts Water components, so that machine parts exposed to saturated steam Damage, for example in the form of corrosion can.
- thermodynamic Reason is when using steam as process steam in the chemical industry or as a working medium in one Steam power plant requires overheating of saturated steam.
- the saturated steam is usually first of all Water separated before further heat is supplied to it.
- a steam power plant working according to the natural circulation principle is usually one arranged in a steam generator Evaporator both on the water and steam side with one Steam drum connected.
- the water-steam mixture generated in the evaporator is fed to the steam drum, which too serves to separate water and steam.
- From the steam drum the water is again fed to the evaporator, so that there is complete circulation.
- the steam In the steam drum the steam is in equilibrium with the water and lies thus as saturated steam.
- To branch off through evaporation Saturated steam obtained as useful steam is on the steam drum a useful steam outlet arranged.
- the steam is usually the useful steam of a superheater heating surface fed and overheated there. The one that overheated Steam is then fed to the steam turbine where it is relaxed working.
- the invention is therefore based on the object of a method and a device for generating barrier steam specify, providing superheated Steam is guaranteed particularly reliably with simple means should be.
- the invention is based on the consideration that the needed as sealing steam when starting a steam turbine superheated steam is at a lower pressure level can than the available saturated steam. So is one Relaxation of a first partial flow to be used of saturated steam possible. With this throttling of the first Partial current lowers its temperature level. The thus resulting temperature difference between the unthrottled Saturated steam and the throttled first partial flow The saturated steam can therefore cause the first partial flow to overheat be used.
- the superheated steam generated in terms of its mass flow and its pressure level particularly flexible to the The first partial flow will be able to adapt process requirements advantageously via a controllable throttle valve guided.
- the relaxed and overheated first partial stream fed to a steam turbine expediently the relaxed and overheated first partial stream fed to a steam turbine.
- the saturated steam is advantageously from a steam drum the water-steam cycle of a steam turbine.
- the stated object is achieved according to the invention from saturated steam by means of a heat exchanger, the primary side and over a throttle element connected on the secondary side to a saturated steam reservoir is.
- the throttle body expediently a controllable throttle valve.
- the heat exchanger is connected on the secondary side to a steam turbine.
- the saturated steam reservoir is advantageously one in the water-steam cycle a steam turbine switched steam drum.
- the stated object is achieved according to the invention by the steam turbine is a separate one connected to the steam drum
- the sealing steam line opens into the secondary side Heat exchanger connected on the primary side to the steam drum is switched.
- the advantages achieved with the invention are in particular in that by overheating the relaxed first Partial flow of saturated steam through heat exchange with a second Partial flow of saturated steam a reliable generation of superheated steam guaranteed with particularly simple means is. Especially with a steam power plant with frequent Night shutdowns are therefore a supply to the steam turbine with superheated steam as barrier steam when restarting guaranteed without an additional heating or Overheating device is required.
- An embodiment of the invention is based on a Drawing explained in more detail.
- the figure shows schematically a steam power plant.
- the steam power plant 1 comprises a steam turbine 2, via a turbine shaft 4 with a generator 6 connected is.
- the steam turbine 2 is on the output side a steam line 10 connected to a condenser 12.
- the condenser 12 is via a line 14, into which a condensate pump 16 is switched, with a feed water tank 18 connected.
- the feed water tank 18 is on the output side via a feed line 20 into which a feed water pump 22 is connected to a steam drum 24.
- For Preheating of the feed water to be supplied from the steam drum 24 S can be a number of preheater heating surfaces, not shown, in line 20 or an economizer.
- the steam drum 24 is on the water outlet side and on the steam inlet side with one arranged in a steam generator 26 Evaporator 28 connected.
- the steam generator 26 can be a fossil or nuclear-fired steam generator or a Heat recovery steam generator.
- a useful steam outlet 30 is arranged, which in a Evaporator 26 arranged superheater 32 to the steam turbine 2 is connected.
- the steam turbine 2 can comprise one or more pressure stages. Depending on the number of pressure levels and the design of the Water-steam circuit 34 of the steam turbine 2 can additionally to the heating surfaces 28 and 32 shown in the figure additional heating surfaces can be provided.
- a sealing steam line 40 is connected to the steam drum 24, via which 2 steam can be fed to the steam turbine 2 is.
- a controllable Throttle valve trained throttle member 42 switched.
- a heat exchanger in the sealing steam line 40 44 switched on the secondary side.
- the heat exchanger 44 is on the primary side via a branching off from the sealing steam line 40 Partial flow line 46 connected to the steam drum 24.
- the steam drum 24 When the steam power plant 1 is operated, the steam drum 24 the water W supplied to the evaporator 28 completely or there partially evaporated and as steam D or water-steam mixture WD returned to the steam drum 24. In the steam drum 24 the steam D is separated from the water W. The steam D is itself in the steam drum 24 with the water W in the thermodynamic Equilibrium and therefore lies as saturated steam in front.
- Hot useful steam N which is under pressure can be used in the steam drum 24 removed and over the superheater 32 of the steam turbine 2 are fed where he relaxes work-performing.
- barrier steam SD is supplied to an area between the turbine shaft 4 and the housing of the steam turbine 2, particularly during a startup process.
- a partial stream t 1 of steam D present as saturated steam is removed from the steam drum 24 serving as a saturated steam reservoir.
- the partial flow t 1 is throttled via the controllable throttle valve or the throttle member 42 in such a way that its pressure level is adapted to the requirements of the steam turbine 2.
- the throttling lowers the temperature level of the partial flow t 1 .
- the partial flow t 1 is overheated by a heat exchange of the unthrottled second partial flow t 2 with the throttled first partial flow t 1 in the heat exchanger 44. This superheated partial flow t 1 can then be fed to the steam turbine 2 as sealing steam SD without it being exposed to a risk of corrosion.
- the steam power plant 1 is therefore particularly suitable for frequent restarting of the steam turbine 2, in particular after a night standstill.
- the steam D present in the steam drum 24 as saturated steam has a temperature of approximately 210 ° C.
- the partial flow t 1 has a temperature of approximately 150 ° C. after it has been throttled.
- this temperature can be increased to approximately 180 ° C. without the need for an additional superheater device.
- the overheating of the partial stream t 1 is thus ensured with particularly simple means and particularly reliably.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Control Of Turbines (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Erzeugung von Sperrdamf Dampfkraftanlage mit einer aus Sattdampf. Sie richtet sich weiter auf eine Einrichtung zur Durchführung dieses Verfahrens und eine Verwendung des nach diesem Verfahren erzeugten Sperrdampfes.The invention relates to a method for producing Sperrdamf steam power plant with a from saturated steam. It continues to focus on one Device for performing this method and use of the barrier steam generated by this method.
Bei der Verdampfung von Wasser durch Zuführung von Wärme verdampft dieses ganz oder teilweise. Der dabei entstehende Dampf steht mit dem verbliebenen Wasser im thermischen Gleichgewicht und wird üblicherweise als Sattdampf bezeichnet. Derartiger Sattdampf enthält möglicherweise beträchtliche Wasseranteile, so daß dem Sattdampf ausgesetzte Maschinenteile Schäden, beispielsweise in Form von Korrosion, erleiden können. Aus diesem Grund und/oder aus thermodynamischen Gründen ist bei der Nutzung von Dampf als Prozeßdampf in der chemischen Industrie oder als Arbeitsmedium in einer Dampfkraftanlage eine Überhitzung von Sattdampf erforderlich. Zur Überhitzung wird der Sattdampf üblicherweise zunächst vom Wasser getrennt, bevor ihm weitere Wärme zugeführt wird.When water evaporates, it evaporates by adding heat this in whole or in part. The resulting one Steam is in the thermal with the remaining water Equilibrium and is usually referred to as saturated steam. Such saturated steam may contain considerable amounts Water components, so that machine parts exposed to saturated steam Damage, for example in the form of corrosion can. For this reason and / or from thermodynamic Reason is when using steam as process steam in the chemical industry or as a working medium in one Steam power plant requires overheating of saturated steam. To overheat, the saturated steam is usually first of all Water separated before further heat is supplied to it.
Bei einer nach dem Naturumlaufprinzip arbeitenden Dampfkraftanlage ist üblicherweise ein in einem Dampferzeuger angeordneter Verdampfer sowohl wasser- als auch dampfseitig mit einer Dampftrommel verbunden. Das im Verdampfer erzeugte Wasser-Dampf-Gemisch wird der Dampftrommel zugeleitet, die zu einer Trennung von Wasser und Dampf dient. Aus der Dampftrommel wird das Wasser wiederum dem Verdampfer zugeleitet, so daß ein vollständiger Umlauf gegeben ist. In der Dampftrommel steht der Dampf mit dem Wasser im Gleichgewicht und liegt somit als Sattdampf vor. Zur Abzweigung von durch die Verdampfung gewonnenem Sattdampf als Nutzdampf ist an der Dampftrommel ein Nutzdampfausgang angeordnet. Beim Betrieb der Dampfkraftanlage wird der Nutzdampf üblicherweise einer Überhitzerheizfläche zugeführt und dort überhitzt. Der so überhitzte Dampf wird dann der Dampfturbine zugeführt, wo er sich arbeitsleistend entspannt.In a steam power plant working according to the natural circulation principle is usually one arranged in a steam generator Evaporator both on the water and steam side with one Steam drum connected. The water-steam mixture generated in the evaporator is fed to the steam drum, which too serves to separate water and steam. From the steam drum the water is again fed to the evaporator, so that there is complete circulation. In the steam drum the steam is in equilibrium with the water and lies thus as saturated steam. To branch off through evaporation Saturated steam obtained as useful steam is on the steam drum a useful steam outlet arranged. When operating the The steam is usually the useful steam of a superheater heating surface fed and overheated there. The one that overheated Steam is then fed to the steam turbine where it is relaxed working.
Bei einem Anfahrvorgang der Dampfkraftanlage, beispielsweise nach einem Nachtstillstand, ist es erforderlich, der Dampfturbine Sperrdampf zuzuführen, durch dessen Einleitung in einen Dichtungsbereich zwischen Turbinenwelle und Turbinengehäuse eine Abdichtung des Turbineninneren gegen die Umgebung der Dampfturbine sichergestellt wird. Eine Zuführung von nicht überhitztem Dampf oder Sattdampf als Sperrdampf setzt dabei Strukturteile der Dampfturbine einer erhöhten Gefährdung durch Korrosion oder Spannungsbeanspruchung aus. Insbesondere für eine Dampfkraftanlage, die nach häufigen Nachtstillständen wieder anzufahren ist, ist daher die Zuführung von überhitztem Dampf als Sperrdampf erforderlich. Besonders bei einem Anfahrvorgang nach einem Nachtstillstand ist das Temperaturniveau im Dampferzeuger jedoch oftmals nicht ausreichend hoch, um eine ausreichende Dampfüberhitzung mittels der im Dampferzeuger vorgesehenen Überhitzerheizflächen zu gewährleisten. Gleich oder ähnliche Anforderungen werden häufig auch an den eingangs erwähnten Prozeßdampf gestellt.When starting the steam power plant, for example After a night shutdown, it is necessary to use the steam turbine To supply sealing steam by introducing it into a Sealing area between the turbine shaft and turbine housing a seal of the turbine interior from the environment the steam turbine is ensured. A feed of does not use superheated steam or saturated steam as sealing steam thereby structural parts of the steam turbine pose an increased risk due to corrosion or stress. In particular for a steam power plant that after frequent night stoppages is to be started again is the feed of superheated steam required as barrier steam. Especially when starting after a night standstill it is However, the temperature level in the steam generator is often not sufficient high to ensure adequate steam superheating the superheater heating surfaces provided in the steam generator guarantee. The same or similar requirements are common also put to the process steam mentioned above.
Es ist aus der EP 0 605 156 A bekannt, Sperrdampf durch Mischen von Sattdampf und überhitztem Dampf zu erzeugung. Eine Erzeugung von überhitztem Dampf durch drosselung von Stattfampf mit anschließender Überhitzung durch Wärmetausch mit ungedrosseltem Dampf ist allgemein aus der FR 2 253 982 A bekannt.It is known from EP 0 605 156 A to produce sealing steam by mixing saturated steam and superheated steam. A generation of superheated steam by throttling substitute steam with subsequent superheating by heat exchange with unthrottled steam is generally known from FR 2 253 982 A.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Einrichtung zur Erzeugung von Sperrdampf anzugeben, wobei die Bereitstellung von überhitztem Dampf mit einfachen Mitteln besonders zuverlässig gewährleistet sein soll.The invention is therefore based on the object of a method and a device for generating barrier steam specify, providing superheated Steam is guaranteed particularly reliably with simple means should be.
Bezüglich des Verfahrens wird diese Aufgabe erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.With regard to the method, this object is achieved according to the invention by the features of claim 1 solved.
Die Erfindung geht dabei von der Überlegung aus, daß der als Sperrdampf beim Anfahren einer Dampfturbine benötigte überhitzte Dampf auf einem niedrigeren Druckniveau liegen kann als der zur Verfügung stehende Sattdampf. Somit ist eine Entspannung eines der Nutzung zuzuführenden ersten Teilstromes des Sattdampfes möglich. Bei dieser Drosselung des ersten Teilstromes senkt sich dessen Temperaturniveau ab. Die somit entstehende Temperaturdifferenz zwischen dem nicht gedrosselten Sattdampf und dem gedrosselten ersten Teilstrom des Sattdampfes kann daher zur Überhitzung des ersten Teilstromes herangezogen werden.The invention is based on the consideration that the needed as sealing steam when starting a steam turbine superheated steam is at a lower pressure level can than the available saturated steam. So is one Relaxation of a first partial flow to be used of saturated steam possible. With this throttling of the first Partial current lowers its temperature level. The thus resulting temperature difference between the unthrottled Saturated steam and the throttled first partial flow The saturated steam can therefore cause the first partial flow to overheat be used.
Um den erzeugten überhitzten Dampf hinsichtlich seines Massenstromes und seines Druckniveaus besonders flexibel an die Prozeßerfordernisse anpassen zu können, wird der erste Teilstrom vorteilhafterweise über ein regelbares Drosselventil geführt.The superheated steam generated in terms of its mass flow and its pressure level particularly flexible to the The first partial flow will be able to adapt process requirements advantageously via a controllable throttle valve guided.
Um mit einfachen Mitteln eine besonders lange Lebensdauer einer Dampfturbine auch bei häufigen Nachtstillständen zu gewährleisten, wird zweckmäßigerweise der entspannte und überhitzte erste Teilstrom einer Dampfturbine zugeführt. Zudem wird vorteilhafterweise der Sattdampf aus einer Dampftrommel des Wasser-Dampf-Kreislaufs einer Dampfturbine entnommen.To ensure a particularly long lifespan with simple means To ensure steam turbine even during frequent night stoppages, expediently the relaxed and overheated first partial stream fed to a steam turbine. In addition the saturated steam is advantageously from a steam drum the water-steam cycle of a steam turbine.
Bezüglich der Einrichtung zur Erzeugung von überhitztem Dampf aus Sattdampf wird die genannte Aufgabe erfindungsgemäß gelöst mittels eines Wärmetauschers, der primärseitig und über ein Drosselorgan sekundärseitig an ein Sattdampfreservoir angeschlossen ist.Regarding the device for generating superheated steam The stated object is achieved according to the invention from saturated steam by means of a heat exchanger, the primary side and over a throttle element connected on the secondary side to a saturated steam reservoir is.
Zur Anpassung des Massenstroms und/oder des Druckniveaus des überhitzten Dampfes an die Prozeßerfordernisse ist das Drosselorgan zweckmäßigerweise ein regelbares Drosselventil.To adjust the mass flow and / or the pressure level of the superheated steam to the process requirements is the throttle body expediently a controllable throttle valve.
In weiterer zweckmäßiger Ausgestaltung ist der Wärmetauscher sekundärseitig mit einer Dampfturbine verbunden. Das Sattdampfreservoir ist vorteilhafterweise eine in den Wasser-Dampf-Kreislauf einer Dampfturbine geschaltete Dampftrommel. In a further expedient embodiment, the heat exchanger is connected on the secondary side to a steam turbine. The saturated steam reservoir is advantageously one in the water-steam cycle a steam turbine switched steam drum.
Bezüglich der Dampfkraftanlage mit einer Dampfturbine, in deren Wasser-Dampf-Kreislauf eine Dampftrommel geschaltet ist, wird die genannte Aufgabe erfindungsgemäß gelöst, indem in die Dampfturbine eine an die Dampftrommel angeschlossene separate Sperrdampfleitung mündet, in die sekundärseitig ein primärseitig an die Dampftrommel angeschlossener Wärmetauscher geschaltet ist.Regarding the steam power plant with a steam turbine, in the Water-steam cycle a steam drum is switched the stated object is achieved according to the invention by the steam turbine is a separate one connected to the steam drum The sealing steam line opens into the secondary side Heat exchanger connected on the primary side to the steam drum is switched.
Um eine lange Lebensdauer einer Dampfturbine mit besonders einfachen Mitteln und besonders zuverlässig sicherzustellen, wird zweckmäßigerweise der gemäß dem obengenannten Verfahren überhitzte Dampf beim Anfahren der Dampfturbine zu deren Abdichtung verwendet.To ensure a long service life of a steam turbine with special simple means and particularly reliably to ensure expediently the according to the above method superheated steam when starting the steam turbine to seal it used.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß durch die Überhitzung des entspannten ersten Teilstromes des Sattdampfes durch Wärmetausch mit einem zweiten Teilstrom des Sattdampfes eine zuverlässige Erzeugung von überhitztem Dampf mit besonders einfachen Mitteln gewährleistet ist. Insbesondere bei einer Dampfkraftanlage mit häufigen Nachtstillständen ist somit eine Versorgung der Dampfturbine mit überhitztem Dampf als Sperrdampf bei einem Wiederanfahren gewährleistet, ohne daß eine zusätzliche Heiz- oder Überhitzungsvorrichtung erforderlich ist.The advantages achieved with the invention are in particular in that by overheating the relaxed first Partial flow of saturated steam through heat exchange with a second Partial flow of saturated steam a reliable generation of superheated steam guaranteed with particularly simple means is. Especially with a steam power plant with frequent Night shutdowns are therefore a supply to the steam turbine with superheated steam as barrier steam when restarting guaranteed without an additional heating or Overheating device is required.
Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert. Darin zeigt die Figur schematisch eine Dampfkraftanlage.An embodiment of the invention is based on a Drawing explained in more detail. The figure shows schematically a steam power plant.
Die Dampfkraftanlage 1 gemäß der Figur umfaßt eine Dampfturbine
2, die über eine Turbinenwelle 4 mit einem Generator 6
verbunden ist. Die Dampfturbine 2 ist ausgangsseitig über
eine Dampfleitung 10 an einen Kondensator 12 angeschlossen.
Der Kondensator 12 ist über eine Leitung 14, in die eine Kondensatpumpe
16 geschaltet ist, mit einem Speisewasserbehälter
18 verbunden. Der Speisewasserbehälter 18 ist ausgangsseitig
über eine Zuführungsleitung 20, in die eine Speisewasserpumpe
22 geschaltet ist, an eine Dampftrommel 24 angeschlossen. Zur
Vorwärmung von der Dampftrommel 24 zuzuführendem Speisewasser
S kann in die Leitung 20 eine Anzahl nicht dargestellter Vorwärmerheizflächen
oder ein Economizer geschaltet sein.The steam power plant 1 according to the figure comprises a steam turbine
2, via a turbine shaft 4 with a
Die Dampftrommel 24 ist wasserausgangsseitig und dampfeingangsseitig
mit einem in einem Dampferzeuger 26 angeordneten
Verdampfer 28 verbunden. Der Dampferzeuger 26 kann dabei ein
fossil- oder nuklearbefeuerter Dampferzeuger oder auch ein
Abhitzedampferzeuger sein. An der Dampftrommel 24 ist weiterhin
ein Nutzdampfausgang 30 angeordnet, der über einen im
Verdampfer 26 angeordneten Überhitzer 32 an die Dampfturbine
2 angeschlossen ist.The
Die Dampfturbine 2 kann eine oder mehrere Druckstufen umfassen.
Je nach Anzahl der Druckstufen und je nach Auslegung des
Wasser-Dampf-Kreislaufs 34 der Dampfturbine 2 können zusätzlich
zu den in der Figur dargestellten Heizflächen 28 und 32
weitere Heizflächen vorgesehen sein.The steam turbine 2 can comprise one or more pressure stages.
Depending on the number of pressure levels and the design of the
Water-
An die Dampftrommel 24 ist eine Sperrdampfleitung 40 angeschlossen,
über die der Dampfturbine 2 Sperrdampf SD zuführbar
ist. In die Sperrdampfleitung 40 ist ein als regelbares
Drosselventil ausgebildetes Drosselorgan 42 geschaltet. In
Strömungsrichtung des Sperrdampfs SD gesehen nach dem Drosselorgan
42 ist in die Sperrdampfleitung 40 ein Wärmetauscher
44 sekundärseitig geschaltet. Der Wärmetauscher 44 ist primärseitig
über eine von der Sperrdampfleitung 40 abzweigende
Teilstromleitung 46 an die Dampftrommel 24 angeschlossen.A sealing
Beim Betrieb der Dampfkraftanlage 1 wird von der Dampftrommel
24 dem Verdampfer 28 zugeführtes Wasser W dort ganz oder
teilweise verdampft und als Dampf D oder Wasser-Dampf-Gemisch
WD in die Dampftrommel 24 zurückgeführt. In der Dampftrommel
24 wird der Dampf D vom Wasser W separiert. Der Dampf D befindet
sich in der Dampftrommel 24 mit dem Wasser W im thermodynamischen
Gleichgewicht und liegt somit als Sattdampf
vor.When the steam power plant 1 is operated, the
Unter Überdruck stehender heißer Nutzdampf N kann der Dampftrommel
24 entnommen und über den Überhitzer 32 der Dampfturbine
2 zugeführt werden, wo er sich arbeitsleistend entspannt.Hot useful steam N which is under pressure can be used in the
Um eine Abdichtung des Turbineninneren der Dampfturbine 2 gegen
deren Umgebung sicherzustellen, wird insbesondere bei einem
Anfahrvorgang einem Bereich zwischen der Turbinenwelle 4
und dem Gehäuse der Dampfturbine 2 Sperrdampf SD zugeführt.
Dazu wird der als ein Sattdampfreservoir dienenden Dampftrommel
24 ein Teilstrom t1 von als Sattdampf vorliegendem
Dampf D entnommen. Der Teilstrom t1 wird über das regelbare
Drosselventil oder das Drosselorgan 42 derart gedrosselt, daß
sein Druckniveau an die Erfordernisse der Dampfturbine 2 angepaßt
ist. Durch die Drosselung senkt sich das Temperaturniveau
des Teilstroms t1 ab. Ein zweiter in der Teilstromleitung
46 geführter nicht gedrosselter Teilstrom t2 des als
Sattdampf vorliegenden Dampfes D weist somit eine höhere Temperatur
auf als der im Drosselorgan 42 gedrosselte erste
Teilstrom t1. Durch einen Wärmetausch des nicht gedrosselten
zweiten Teilstroms t2 mit dem gedrosselten ersten Teilstrom t1
im Wärmetauscher 44 wird der Teilstrom t1 überhitzt. Dieser
überhitzte Teilstrom t1 kann dann der Dampfturbine 2 als
Sperrdampf SD zugeführt werden, ohne daß diese einer Gefährdung
durch Korrosion ausgesetzt ist.In order to ensure that the interior of the turbine of the steam turbine 2 is sealed off from its surroundings, barrier steam SD is supplied to an area between the turbine shaft 4 and the housing of the steam turbine 2, particularly during a startup process. For this purpose, a partial stream t 1 of steam D present as saturated steam is removed from the
Die Dampfkraftanlage 1 ist somit besonders geeignet für ein
häufiges Wiederanfahren der Dampfturbine 2, insbesondere nach
einem Nachtstillstand. Nach einem Nachtstillstand weist der
in der Dampftrommel 24 als Sattdampf vorliegende Dampf D eine
Temperatur von etwa 210° C auf. Aufgrund von Druck- und Temperaturverlusten
in Rohrleitungen und aufgrund der Drosselung
durch das Drosselorgan 42 weist der Teilstrom t1 nach seiner
Drosselung eine Temperatur von etwa 150° C auf. Durch Wärmetausch
mit dem nicht gedrosselten Teilstrom t2 kann diese
Temperatur auf etwa 180° C erhöht werden, ohne daß dazu eine
zusätzliche Überhitzereinrichtung benötigt wird. Die Überhitzung
des Teilstroms t1 ist somit mit besonders einfachen Mitteln
und besonders zuverlässig gewährleistet.The steam power plant 1 is therefore particularly suitable for frequent restarting of the steam turbine 2, in particular after a night standstill. After a night standstill, the steam D present in the
Claims (3)
- Method of generating sealing steam for a steam turbine (2), in which a first partial flow (t1) of saturated steam extracted from a steam drum (24) is throttled before it is superheated by heat exchange with a second partial flow (t2) of the saturated steam.
- Steam power plant (1) having a steam turbine (2), in the water/steam cycle (34) of which a steam drum (24) is connected, a separate sealing-steam line (40) connected to the steam drum (24) leading into the steam turbine (2), in which sealing-steam line (40) a heat exchanger (44) connected on the primary side to the steam drum (24) is connected on the secondary side via a throttle member (42).
- Use of the sealing steam generated according to the method according to Claim 1 for starting a steam turbine (2) of a steam power plant (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19538674A DE19538674A1 (en) | 1995-10-17 | 1995-10-17 | Process and device for generating superheated steam from saturated steam and steam power plant |
| DE19538674 | 1995-10-17 | ||
| PCT/DE1996/001927 WO1997014285A2 (en) | 1995-10-17 | 1996-10-08 | Method and device for producing superheated steam from saturated steam and a steam generating facility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0856126A2 EP0856126A2 (en) | 1998-08-05 |
| EP0856126B1 true EP0856126B1 (en) | 2000-02-23 |
Family
ID=7775097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96945485A Expired - Lifetime EP0856126B1 (en) | 1995-10-17 | 1996-10-08 | Method for Producing Gland Steam, and corresponding Steam Power Station |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6003317A (en) |
| EP (1) | EP0856126B1 (en) |
| DE (2) | DE19538674A1 (en) |
| ES (1) | ES2143803T3 (en) |
| IN (1) | IN190405B (en) |
| MY (1) | MY129600A (en) |
| TW (1) | TW325513B (en) |
| WO (1) | WO1997014285A2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19919653A1 (en) * | 1999-04-29 | 2000-11-02 | Abb Alstom Power Ch Ag | Barrier steam feed |
| US6921858B2 (en) * | 2002-11-08 | 2005-07-26 | Bechtel Bwxt Idaho, Llc | Method and apparatus for pressurizing a liquefied gas |
| US7325400B2 (en) * | 2004-01-09 | 2008-02-05 | Siemens Power Generation, Inc. | Rankine cycle and steam power plant utilizing the same |
| EP1961921A1 (en) * | 2007-02-26 | 2008-08-27 | Siemens Aktiengesellschaft | Seal for a turbo engine |
| US8424281B2 (en) * | 2007-08-29 | 2013-04-23 | General Electric Company | Method and apparatus for facilitating cooling of a steam turbine component |
| GB2457266B (en) * | 2008-02-07 | 2012-12-26 | Univ City | Generating power from medium temperature heat sources |
| US8347598B2 (en) | 2011-03-18 | 2013-01-08 | General Electric Company | Apparatus for starting up combined cycle power systems and method for assembling same |
| DE102012019167A1 (en) * | 2012-09-28 | 2014-04-03 | Man Diesel & Turbo Se | Sealing steam system |
| CN104088677B (en) * | 2014-06-25 | 2016-03-02 | 北京越麓咨询有限责任公司 | Steam reheater in a kind of machine of multistage impulse turbine |
| CN108779405B (en) * | 2016-03-14 | 2020-11-24 | 托普索公司 | Method and plant for producing a methanated gas |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH367520A (en) * | 1959-04-22 | 1963-02-28 | Sulzer Ag | Method and device for generating sealing steam |
| DE1105431B (en) * | 1959-04-22 | 1961-04-27 | Sulzer Ag | Device for the delivery of sealing steam for sealing points in steam power plants, especially steam turbine plants |
| SE373196B (en) * | 1973-12-10 | 1975-01-27 | Svenska Maskinverken Ab | |
| US4474010A (en) * | 1980-02-15 | 1984-10-02 | Sumitomo Semento Kabushiki Kaisha | Method of recovering exhaust gas from boiler in electrical power generating device using combustible material as fuel and apparatus for performing such method |
| JPS5951109A (en) * | 1982-09-17 | 1984-03-24 | Hitachi Ltd | Condenser vacuum holder of steam power plant |
| US4873829A (en) * | 1988-08-29 | 1989-10-17 | Williamson Anthony R | Steam power plant |
| JPH03275903A (en) * | 1990-03-23 | 1991-12-06 | Toshiba Corp | Starting method of steam turbine plant and condenser used therefor |
| US5412936A (en) * | 1992-12-30 | 1995-05-09 | General Electric Co. | Method of effecting start-up of a cold steam turbine system in a combined cycle plant |
-
1995
- 1995-10-17 DE DE19538674A patent/DE19538674A1/en not_active Withdrawn
-
1996
- 1996-10-01 TW TW085111938A patent/TW325513B/en not_active IP Right Cessation
- 1996-10-08 WO PCT/DE1996/001927 patent/WO1997014285A2/en active IP Right Grant
- 1996-10-08 EP EP96945485A patent/EP0856126B1/en not_active Expired - Lifetime
- 1996-10-08 DE DE59604502T patent/DE59604502D1/en not_active Expired - Lifetime
- 1996-10-08 ES ES96945485T patent/ES2143803T3/en not_active Expired - Lifetime
- 1996-10-11 IN IN1799CA1996 patent/IN190405B/en unknown
- 1996-10-15 MY MYPI96004286A patent/MY129600A/en unknown
-
1998
- 1998-04-17 US US09/062,627 patent/US6003317A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IN190405B (en) | 2003-07-27 |
| DE59604502D1 (en) | 2000-03-30 |
| WO1997014285A3 (en) | 1997-07-03 |
| MY129600A (en) | 2007-04-30 |
| TW325513B (en) | 1998-01-21 |
| US6003317A (en) | 1999-12-21 |
| WO1997014285A2 (en) | 1997-04-24 |
| ES2143803T3 (en) | 2000-05-16 |
| EP0856126A2 (en) | 1998-08-05 |
| DE19538674A1 (en) | 1997-04-24 |
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