EP0851971B1 - Process and device for preheating the feed water to a steam generator in power station processes - Google Patents

Process and device for preheating the feed water to a steam generator in power station processes Download PDF

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Publication number
EP0851971B1
EP0851971B1 EP96931765A EP96931765A EP0851971B1 EP 0851971 B1 EP0851971 B1 EP 0851971B1 EP 96931765 A EP96931765 A EP 96931765A EP 96931765 A EP96931765 A EP 96931765A EP 0851971 B1 EP0851971 B1 EP 0851971B1
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EP
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Prior art keywords
steam
ejector
exergy
disposed
generator
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EP96931765A
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German (de)
French (fr)
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EP0851971A1 (en
Inventor
Norbert KNÜWER
Achim Nietzschmann
Wolfgang Urbanczyk
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Steag Energy Services GmbH
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Steag Encotec GmbH
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    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
    • F01K7/40—Use of two or more feed-water heaters in series

Definitions

  • the invention relates to a method for preheating the Feed water of a steam generator in a power plant process according to the preamble of claim 1. Furthermore, the invention relates an arrangement according to the preamble of claim 3.
  • From US-A-3 973 402 is a steam turbine power plant with a feed water preheating of the generic type known.
  • the steam is drawn from a high-pressure turbine tapping with a higher level of exergy Driving steam mixed in a steam jet to increase efficiency to improve the power plant process.
  • motive steam serves the exhaust steam of a reheater, which is made with steam the steam generator is operated.
  • This known arrangement improves process efficiency, but requires one costly turbine tapping and a relatively complex control the motive steam and suction steam connections.
  • the invention has for its object the cost / benefit ratio to improve feed water preheating.
  • the arrangement according to the invention can of course be from the house can be integrated into newly designed power plants, whereby through suitable selection of the taps and interpretation of the at least a thermocompressor a very close approximation of the Steam jet outlet pressure or temperature at the maximum permissible pressure or the maximum permissible temperature of the respective preheater can be reached. Accordingly the efficiency of the preheating of the feed water is high.
  • the thermal compressors used according to the invention or steam jets are relatively inexpensive producible.
  • the feed water is preferably preheated in several stages, and the steam mixture is after the thermal compression of the highest preheater level.
  • the steam mixture is after the thermal compression of the highest preheater level.
  • inferior bleed steam after thermocompression with KZÜ steam from a lower stage of the preheater line be supplied for preheating water.
  • the exit steam from a high pressure turbine 2 which is also used as a cold reheat steam (KZÜ steam) is referred to for raising the temperature of the feed water in the last preheating stage HDV2 used.
  • KZÜ steam cold reheat steam
  • At the entry point 7 in the steam generator 1 is the feed water target temperature reached.
  • the previous preheating stage HDV1 will with exergetically relatively high quality tap steam from the Tap A2 of the two-flow medium pressure turbine 3 is applied. Exergetically relatively inferior steam from one Tap A3 is fed back into the feed water tank 4.
  • the arrangement of the embodiment according to the invention 1 differs from the conventional arrangement 1a by a different and cost-damping Feed water preheating.
  • the last preheating stage HDV2 becomes Raising the temperature of the feed water with a steam mixture acted upon by a thermal compressor or steam jet 11, whose driving steel connection 12 with driving steam from a reheating stage is applied to the steam generator 1.
  • One Suction port 13 of the steam jet 11 is fed KZÜ steam.
  • the KZÜ steam sucked in over 13 is in the steam jet 11 compressed and with the motive steam from the steam generator 1 mixed.
  • the motive steam does not need the reheater area to be removed from the steam generator 1; instead can the tapping point at any suitable point in the steam generator or in the subsequent live steam line 16 the inlet valves of the HP turbine.
  • second steam jet 31 is provided, the exergetically inferior Steam from the tap A3 of the MD turbine 3 below Use of motive steam is sucked out of the steam generator 1.
  • the resulting steam mixture is used to raise the temperature in the first preheating stage HDV1.
  • the motive steam connections 12 and 32 of the two steam jets 11 and 31 are connected in parallel, while the suction ports 13 and 33 with different Tap steam from A1 or A3 are acted on.
  • the conventional basic circuit according to FIG. 2a differs differs from that according to FIG. 1a by a third preheating stage HDV3 in the preheater street 6 '.
  • HDV3 lifts the feed water to the target temperature at inlet 7 of the steam generator 1 on.
  • the third preheater HDV3 is steamed from one High pressure turbine tap AZ applied. This conventional one Execution due to the high-pressure tap AZ high Investment costs.
  • the invention comes in at least comparably cheaper Raising the temperature of the feed water at the inlet point 7 without HD tap AZ off.
  • a suitable circuit arrangement is shown in Fig. 2.
  • thermocompressor or steam jet 11 corresponds to those from FIG. 1.
  • the second preheater HDV1 is just like the corresponding one Preheater of the conventional arrangement according to FIG. 2a with KZÜ steam from tap A1.
  • Thermocompressor or steam jet 31 is also the first Preheating stage HDV1 with low-energy tap steam from the tapping A3 of the MD turbine 3 after thermal compression by motive steam in a second Thermocompressor or steam jet 31. Its outlet connection 34 is connected to the HDV1.
  • the motive steam connection 32 of the steam jet 31 and the suction port 13 of the steam jet 11 are therefore connected in parallel.
  • the motive steam connection could 32 also in accordance with the embodiment according to FIG. 1 connected in parallel to the motive steam connection 12 and with steam be acted upon from the steam generation line 19.
  • a safety shut-off valve 18 the motive steam connection 12 upstream of the steam jet 11. It secures the Preheater HDV2 or HDV3 acted upon by steam jet 11 against impermissible operating conditions.
  • the operating pressure can be applied at the resulting steam jet outlet temperature in outlet 14 to the maximum permissible pressure in the associated preheater (HDV2 or HDV3) be approximated.
  • the operating pressure in the preheater can vary from Outlet pressure of the high-pressure turbine through suitable check valves be decoupled.

Abstract

A steam mixture from a thermo-compressor (11) is applied to the last preheating stage (HDV2) to raise the temperature of the feed water of a steam generator (1). KZÜ steam (Cold intermediate reheating steam) is fed from an outlet tapping (A1) of the high-pressure turbine (2) to an intake union (13) on the thermo-compressor (11). The operating steam here is steam from the generator (1) with which the KZÜ steam is compressed and mixed. Exergetically lower steam is extracted by a second thermocompressor from a tapping (A3) of a medium-pressure turbine (3) using operating steam from the steam generator (1). The steam mixture obtained is used to raise the temperature of the first preheating stage (HDV1) of the preheating system (6).

Description

Die Erfindung betrifft ein Verfahren zum Vorwärmen des Speisewassers eines Dampferzeugers in einem Kraftwerksprozeß nach dem Oberbegriff des Anspruchs 1. Ferner betrifft die Erfindung eine Anordnung nach dem Oberbegriff des Anspruchs 3.The invention relates to a method for preheating the Feed water of a steam generator in a power plant process according to the preamble of claim 1. Furthermore, the invention relates an arrangement according to the preamble of claim 3.

Bei Kraftwerksprozessen ist es bekannt und üblich, aus Turbinenanzapfungen oder aus einer kalten Zwischenüberhitzung (KZÜ) Dampf zu entnehmen und diesen Dampf in Hochdruck- und Niederdruck-Vorwärmern zur Speisewasservorwärmung zu nutzen. Durch diese Art der Speisewasservorwärmung kann die Zufuhr an Primärenergie im Dampferzeuger verringert werden. Allerdings ist die Anzahl der Anzapfungen an der Turbine sowohl aus wirtschaftlichen als auch aus technischen Gründen begrenzt. Die Austrittstemperatur aus dem jeweiligen Speisewasser-Vorwärmer ist begrenzt durch die Sättigungs- bzw. Überhitzungstemperatur des Anzapfdampfes.In power plant processes, it is known and customary to Turbine taps or from a cold reheat (KZÜ) to extract steam and this steam in high pressure and Use low pressure preheaters for preheating water. This type of feed water preheating can increase the supply Primary energy in the steam generator can be reduced. Indeed is the number of taps on the turbine from both economic limited as well for technical reasons. The Outlet temperature from the respective feed water preheater is limited by the saturation or superheating temperature of the tap steam.

Aus der US-A-3 973 402 ist eine Dampfturbinenkraftwerksanlage mit einer Speisewasservorwärmung der gattungsgemäßen Art bekannt. Dabei wird der Dampf aus einer Hochdruckturbinenanzapfung mit einem auf höherem Exergieniveau befindlichen Treibdampf in einem Dampfstrahler gemischt, um den Wirkungsgrad des Kraftwerksprozesses zu verbessern. Als Treibdampf dient der Abdampf eines Zwischenüberhitzers, der mit Dampf aus dem Dampferzeuger betrieben wird. Diese bekannte Anordnung verbessert zwar den Prozeßwirkungsgrad, bedingt aber eine kostspielige Turbinenanzapfung und eine relativ aufwendige Regelung der Treibdampf- und Saugdampfanschlüsse.From US-A-3 973 402 is a steam turbine power plant with a feed water preheating of the generic type known. The steam is drawn from a high-pressure turbine tapping with a higher level of exergy Driving steam mixed in a steam jet to increase efficiency to improve the power plant process. As motive steam serves the exhaust steam of a reheater, which is made with steam the steam generator is operated. This known arrangement improves process efficiency, but requires one costly turbine tapping and a relatively complex control the motive steam and suction steam connections.

Der Erfindung liegt die Aufgabe zugrunde, das Kosten/Nutzenverhältnis bei der Speisewasservorwärmung zu verbessern. The invention has for its object the cost / benefit ratio to improve feed water preheating.

Ausgehend von dem eingangs genannten Verfahren, besteht die erfindungsgemäße Lösung dieser Aufgabe darin,

  • daß die auf höherem Exergieniveau befindliche Dampf-Teilmenge dem Dampferzeuger oder einer dem Dampferzeuger nachfolgenden Frischdampfleitung direkt entnommenen wird; und
  • daß die auf niedrigerem Exergieniveau befindliche Dampf-Teilmenge nach teilweiser Entspannung in einer Turbine einer kalten Zwischenüberhitzung entnommen wird.
    • Based on the method mentioned at the outset, the solution to this problem according to the invention consists in
  • that the partial steam quantity located at a higher exergy level is taken directly from the steam generator or a live steam line following the steam generator; and
  • that the partial steam quantity located at a lower exergy level is taken from a cold reheat after partial relaxation in a turbine.

    • Die zugehörige Anordnung zur Durchführung des Verfahrens ist dadurch gekennzeichnet,

  • daß der Treibdampfanschluß des Dampfstrahlers direkt mit dem Dampferzeuger oder einer dem Dampferzeuger nachfolgenden Frischdampfleitung verbunden ist; und
  • daß der Saugdampfanschluß des Dampfstrahlers mit einer Zwischenüberhitzung (KZÜ) verbunden ist.
    • The associated arrangement for carrying out the method is characterized in that
  • that the motive steam connection of the steam jet is connected directly to the steam generator or a live steam line following the steam generator; and
  • that the suction steam connection of the steam jet is connected to an intermediate overheating (KZÜ).

    • Dieser Erfindungsgegenstand ist nahezu universell einsetzbar. Die erfindungsgemäße Anordnung kann natürlich von Haus aus in neu konzipierte Kraftwerke integriert werden, wobei durch geeignete Auswahl der Anzapfungen und Auslegung des wenigstens einen Thermokompressors eine sehr enge Annäherung des Dampfstrahler-Austrittsdrucks bzw. -temperatur an den maximal zulässigen Druck bzw. die maximal zulässige Temperatur des jeweiligen Vorwärmers erreicht werden kann. Dementsprechend hoch ist der Wirkungsgrad bei der Speisewasservorwärmung. Bei neuen Anlagen ermöglicht die Erfindung die Einsparung einer teuren HD-Anzapfung. Die erfindungsgemäß eingesetzten Thermokompressoren bzw. Dampfstrahler sind relativ kostengünstig herstellbar.This subject of the invention is almost universally applicable. The arrangement according to the invention can of course be from the house can be integrated into newly designed power plants, whereby through suitable selection of the taps and interpretation of the at least a thermocompressor a very close approximation of the Steam jet outlet pressure or temperature at the maximum permissible pressure or the maximum permissible temperature of the respective preheater can be reached. Accordingly the efficiency of the preheating of the feed water is high. At The invention enables new systems to be saved expensive HD tapping. The thermal compressors used according to the invention or steam jets are relatively inexpensive producible.

    Aber auch in bestehenden Anlagen kann der Wirkungsgrad des Wassersdampfkreislaufs durch Einsatz der Erfindung verbessert werden, wodurch Primärenergie eingespart wird.But the efficiency of the Steam cycle improved by using the invention which saves primary energy.

    Vorzugsweise wird das Speisewasser mehrstufig vorgewärmt, und die Dampfmischung wird nach der Thermokompression der höchsten Vorwärmerstufe zugeführt. In Weiterbildung der Erfindung kann dabei minderwertiger Anzapfdampf nach Thermokompression mit KZÜ-Dampf einer niedrigeren Stufe der Vorwärmerstraße zur Speisewasservorwärmung zugeführt werden. The feed water is preferably preheated in several stages, and the steam mixture is after the thermal compression of the highest preheater level. In development of the invention can inferior bleed steam after thermocompression with KZÜ steam from a lower stage of the preheater line be supplied for preheating water.

    Sichert man die Vorwärmer durch Sicherheitsabsperrarmaturen gegen unzulässige Betriebszustände ab, so können bei bestehenden Anlagen die Betriebsdrücke am HDV (Hochdruckvorwärmer) bei den sich ergebenden Dampfstrahler-Austrittstemperaturen an die maximal zulässigen Drücke sehr eng angenähert werden. Der Betriebsdruck im Vorwärmer kann durch geeignete Rückschlagklappen vom Turbinenaustrittsdruck entkoppelt werden.Securing the preheater with safety shut-off fittings against inadmissible operating states, so with existing Attach the operating pressures to the HDV (High pressure preheater) at the resulting steam jet outlet temperatures the maximum allowable pressures very much to be closely approximated. The operating pressure in the preheater can through suitable check valves from the turbine outlet pressure be decoupled.

    Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und aus der folgenden Beschreibung von in der Zeichnung dargestellten Ausführungsbeispielen.Further details and advantages of the invention emerge itself from the subclaims and from the following description of embodiments shown in the drawing.

    In der Zeichnung zeigen:

    Fig. 1A
    einen Ausschnitt aus der Basisschaltung eines herkömmlichen Dampfkraftwerks mit Speisewasservorwärmung;
    Fig. 1
    eine durch Einbau eines Ausführungsbeispiels der Erfindung verbesserte Basisschaltung;
    Fig. 2A
    einen Ausschnitt einer herkömmlichen Basisschaltung eines anderen Dampfkraftwerks mit Hochdruckturbinenanzapfung; und
    Fig. 2
    eine mit der herkömmlichen Anordnung gemäß Fig. 2A vergleichbare Kraftwerkanordnung mit Speisewasservorwärmung gemäß einem anderen Ausführungsbeispiel der Erfindung.
    The drawing shows:
    Fig. 1A
    a section of the basic circuit of a conventional steam power plant with feed water preheating;
    Fig. 1
    a base circuit improved by incorporating an embodiment of the invention;
    Figure 2A
    a section of a conventional basic circuit of another steam power plant with high pressure turbine tapping; and
    Fig. 2
    a comparable with the conventional arrangement of FIG. 2A power plant arrangement with feed water preheating according to another embodiment of the invention.

    Bei der herkömmlichen Kraftwerksschaltung gemäß Fig. 1A wird das Speisewasser eines Dampferzeugers 1 aus einem Speisewasserbehälter 4 von einer Speisewasserpumpe 5 in eine als ganze mit 6 bezeichnete Vorwärmstraße aus zwei aufeinanderfolgenden Hochdruck-Vorwärmern HDV1 und HDV2 gefördert. In den beiden Vorwärmestufen wird die Speisewassertemperatur schrittweise soweit angehoben, daß das Speisewasser an der Eintrittsstelle 7 in den Dampferzeuger 1 die Solltemperatur erreicht.In the conventional power plant circuit according to FIG. 1A the feed water of a steam generator 1 from a feed water tank 4 from a feed water pump 5 into a whole preheating line labeled 6 from two successive High pressure preheaters HDV1 and HDV2 promoted. In the In both preheating stages, the feed water temperature is gradually increased raised so far that the feed water at the entry point 7 in the steam generator 1 reaches the target temperature.

    In dem in Fig. 1a dargestellten herkömmlichen Ausführungsbeispiel wird der Austrittsdampf aus einer Hochdruckturbine 2, der auch als kalter Zwischenüberhitzungsdampf (KZÜ-Dampf) bezeichnet wird, zur Temperaturanhebung des Speisewassers in der letzten Vorwärmestufe HDV2 verwendet. An der Eintrittsstelle 7 in den Dampferzeuger 1 wird die Speisewasser-Solltemperatur erreicht. Die vorausgehende Vorwärmestufe HDV1 wird mit exergetisch relativ hochwertigem Anzapfdampf aus der Anzapfung A2 der zweiflutigen Mitteldruckturbine 3 beaufschlagt. Exergetisch relativ minderwertiger Dampf aus einer Anzapfung A3 wird in den Speisewasserbehälter 4 rückgeführt.In the conventional embodiment shown in Fig. 1a the exit steam from a high pressure turbine 2, which is also used as a cold reheat steam (KZÜ steam) is referred to for raising the temperature of the feed water in the last preheating stage HDV2 used. At the entry point 7 in the steam generator 1 is the feed water target temperature reached. The previous preheating stage HDV1 will with exergetically relatively high quality tap steam from the Tap A2 of the two-flow medium pressure turbine 3 is applied. Exergetically relatively inferior steam from one Tap A3 is fed back into the feed water tank 4.

    Die erfindungsgemäße Anordnung des Ausführungsbeispiels gemäß Fig. 1 unterscheidet sich von der herkömmlichen Anordnung gemäß Fig. 1a durch eine andersartige und kostendämpfende Speisewasservorwärmung. Die letzte Vorwärmestufe HDV2 wird zur Temperaturanhebung des Speisewassers mit einem Dampfgemisch aus einem Thermokompressor bzw. Dampfstrahler 11 beaufschlagt, dessen Treibstahlanschluß 12 mit Treibdampf aus einer Nacherhitzungsstufe des Dampferzeugers 1 beaufschlagt ist. Einem Ansauganschluß 13 des Dampfstrahlers 11 wird KZÜ-Dampf zugeführt. Der über 13 angesaugte KZÜ-Dampf wird im Dampfstrahler 11 verdichtet und mit dem Treibdampf aus dem Dampferzeuger 1 gemischt. Der Treibdampf braucht nicht dem Nacherhitzerbereich des Dampferzeugers 1 entnommen zu werden; statt dessen kann die Entnahmestelle an irgendeiner geeigneten Stelle im Dampferzeuger oder in der nachfolgenden Frischdampfleitung 16 vor den Einlaßventilen der HD-Turbine angeordnet sein.The arrangement of the embodiment according to the invention 1 differs from the conventional arrangement 1a by a different and cost-damping Feed water preheating. The last preheating stage HDV2 becomes Raising the temperature of the feed water with a steam mixture acted upon by a thermal compressor or steam jet 11, whose driving steel connection 12 with driving steam from a reheating stage is applied to the steam generator 1. One Suction port 13 of the steam jet 11 is fed KZÜ steam. The KZÜ steam sucked in over 13 is in the steam jet 11 compressed and with the motive steam from the steam generator 1 mixed. The motive steam does not need the reheater area to be removed from the steam generator 1; instead can the tapping point at any suitable point in the steam generator or in the subsequent live steam line 16 the inlet valves of the HP turbine.

    Zur weiteren Wirkungsgradverbesserung des Wasser-Dampf-Kreislaufs ist bei dem Ausführungsbeispiel gemäß Fig. 1 ein zweiter Dampfstrahler 31 vorgesehen, der exergetisch minderwertigen Dampf aus der Anzapfung A3 der MD-Turbine 3 unter Verwendung von Treibdampf aus dem Dampferzeuger 1 ansaugt. Das entstehende Dampfgemisch dient zur Temperaturanhebung in der ersten Vorwärmestufe HDV1. Die Treibdampfanschlüsse 12 und 32 der beiden Dampfstrahler 11 und 31 sind parallel geschaltet, während die Sauganschlüsse 13 und 33 mit unterschiedlichem Anzapfdampf aus A1 bzw. A3 beaufschlagt sind.To further improve the efficiency of the water-steam cycle is in the embodiment of FIG. 1 second steam jet 31 is provided, the exergetically inferior Steam from the tap A3 of the MD turbine 3 below Use of motive steam is sucked out of the steam generator 1. The The resulting steam mixture is used to raise the temperature in the first preheating stage HDV1. The motive steam connections 12 and 32 of the two steam jets 11 and 31 are connected in parallel, while the suction ports 13 and 33 with different Tap steam from A1 or A3 are acted on.

    Die herkömmliche Basisschaltung gemäß Fig. 2a unterscheidet sich von derjenigen gemäß Fig. 1a durch eine dritte Vorwärmstufe HDV3 in der Vorwärmerstraße 6'. HDV3 hebt das Speisewasser auf die Solltemperatur am Einlaß 7 des Dampferzeugers 1 an. Der dritte Vorwärmer HDV3 wird mit Dampf aus einer Hochdruckturbinenzapfung AZ beaufschlagt. Diese herkömmliche Ausführung bedingt durch die HD-Anzapfung AZ hohe Investitionskosten.The conventional basic circuit according to FIG. 2a differs differs from that according to FIG. 1a by a third preheating stage HDV3 in the preheater street 6 '. HDV3 lifts the feed water to the target temperature at inlet 7 of the steam generator 1 on. The third preheater HDV3 is steamed from one High pressure turbine tap AZ applied. This conventional one Execution due to the high-pressure tap AZ high Investment costs.

    Die Erfindung kommt bei zumindest vergleichbar günstiger Temperaturanhebung des Speisewassers an der Einlaßstelle 7 ohne HD-Anzapfung AZ aus. Eine geeignete Schaltungsanordnung ist in Fig. 2 gezeigt.The invention comes in at least comparably cheaper Raising the temperature of the feed water at the inlet point 7 without HD tap AZ off. A suitable circuit arrangement is shown in Fig. 2.

    Die Temperaturanhebung geschieht bei dem Ausführungsbeispiel gemäß Fig. 2 in der letzten Stufe (HDV3) mit den gleichen Mitteln wie in der letzten Stufe HDV2 bei dem Ausführungsbeispiel gemäß Fig. 1. Insofern stimmen die Bezeichnungen des Thermokompressors bzw. Dampfstrahlers 11 und der zugehörigen Anschlüsse 12, 13 und 14 mit denjenigen aus Fig. 1 überein.The temperature increase occurs in the embodiment 2 in the last stage (HDV3) with the same means as in the last stage HDV2 in the embodiment 1. In this respect, the names are correct of the thermocompressor or steam jet 11 and the associated Connections 12, 13 and 14 correspond to those from FIG. 1.

    Der zweite Vorwärmer HDV1 wird ebenso wie der entsprechende Vorwärmer der herkömmlichen Anordnung gemäß Fig. 2a mit KZÜ-Dampf aus der Anzapfung A1 beaufschlagt.The second preheater HDV1 is just like the corresponding one Preheater of the conventional arrangement according to FIG. 2a with KZÜ steam from tap A1.

    Auch in dem Ausführungsbeispiel gemäß Fig. 2 ist die erste Vorwärmstufe HDV1 mit energetisch minderwertigem Anzapfdampf aus der Anzapfung A3 der MD-Turbine 3 beaufschlagt und zwar nach Thermokompression durch Treibdampf in einem zweiten Thermokompressor bzw. Dampfstrahler 31. Dessen Ausgangsanschluß 34 ist mit dem HDV1 verbunden. Bei dem Ausführungsbeispiel gemäß Fig. 2 dient der KZÜ-Dampf aus der Anzapfung A1 als Treibdampf. Der Treibdampfanschluß 32 des Dampfstrahlers 31 und der Sauganschluß 13 des Dampfstrahlers 11 sind daher parallel geschaltet. Selbstverständlich könnte der Treibdampfanschluß 32 auch entsprechend der Ausführung gemäß Fig. 1 zum Treibddampfanschluß 12 parallel geschaltet und mit Dampf aus der Dampferzeugungsleitung 19 beaufschlagt sein.2 is also the first Preheating stage HDV1 with low-energy tap steam from the tapping A3 of the MD turbine 3 after thermal compression by motive steam in a second Thermocompressor or steam jet 31. Its outlet connection 34 is connected to the HDV1. In the embodiment 2 serves the KZÜ steam from the tap A1 as motive steam. The motive steam connection 32 of the steam jet 31 and the suction port 13 of the steam jet 11 are therefore connected in parallel. Of course, the motive steam connection could 32 also in accordance with the embodiment according to FIG. 1 connected in parallel to the motive steam connection 12 and with steam be acted upon from the steam generation line 19.

    In beiden beschriebenen Ausführungsbeispielen der Erfindung ist ein Sicherheitsabsperrarmatur 18 dem Treibdampfanschluß 12 des Dampfstrahlers 11 vorgeschaltet. Sie sichert den vom Dampfstrahler 11 beaufschlagten Vorwärmer HDV2 bzw. HDV3 gegen unzulässige Betriebszustände ab. Bei einem Einbau des beschriebenen Thermokompressors 11 in bestehende herkömmliche Anlagen kann der Betriebsdruck bei der sich ergebenden Dampfstrahler-Austrittstemperatur im Auslaß 14 an den maximal zulässigen Druck im zugehörigen Vorwärmer (HDV2 bzw. HDV3) angenähert werden. Der Betriebsdruck im Vorwärmer kann vom Austrittsdruck der HD-Turbine durch geeignete Rückschlagklappen entkoppelt werden.In both described embodiments of the invention is a safety shut-off valve 18 the motive steam connection 12 upstream of the steam jet 11. It secures the Preheater HDV2 or HDV3 acted upon by steam jet 11 against impermissible operating conditions. When installing the described thermal compressor 11 in existing conventional The operating pressure can be applied at the resulting steam jet outlet temperature in outlet 14 to the maximum permissible pressure in the associated preheater (HDV2 or HDV3) be approximated. The operating pressure in the preheater can vary from Outlet pressure of the high-pressure turbine through suitable check valves be decoupled.

    Im Rahmen des Erfindungsgedankens sind zahlreiche Abwandlungen möglich. In vielen Fällen werden gewünschte Wirkungsgradsteigerungen und die Einsparung von Investitionskosten bereits durch die Verwendung nur eines einzigen Dampfstrahlers 11 in der in Fig. 1 dargestellten Anordnung erreicht; dabei kann die Dampfbeaufschlagung der vorausgehenden Stufe(n) herkömmlicher Ausführung sein. Auch die Anzapfungen an den Turbinen sind in Fig. 1 nur beispielsweise gezeigt; sie können sich bei bereits existierenden Anlagen nach den baulichen Gegebenheiten richten.There are numerous modifications within the scope of the inventive concept possible. In many cases, desired increases in efficiency and saving on investment costs through the use of just a single steam jet 11 reached in the arrangement shown in Fig. 1; there can apply steam to the previous stage (s) be conventional execution. Also the taps on the Turbines are shown in Fig. 1 only by way of example; you can with existing systems according to the structural Straighten the circumstances.

    Claims (6)

    1. Method of preheating the feedwater of a steam generator (1) in a power station process, wherein at least two part steam quantities disposed at different exergy levels are removed and are mixed with use of a thermocompression method, wherein the part steam quantity disposed at the higher exergy level is used as drive steam for suction and compression of the part steam quantity disposed at the lower exergy level and wherein the steam mixture is fed to a feedwater preheater (HDV2; HDV3) after the thermocompression, characterised in that the part steam quantity disposed at the higher exergy level is removed directly at the steam generator or at a fresh steam duct (16) downstream of the steam generator and that the part steam quantity disposed at the lower exergy level is removed at a cold intermediate superheating (KZÜ) after partial expansion in a turbine (2).
    2. Method according to claim 1, characterised in that the feedwater is preheated in multi-staged manner, that the steam mixture is fed to the highest preheating stage after the thermocompression and that bleed steam disposed at the low exergy level is fed to a lower feedwater preheater stage (HDV1; HDV2) after thermocompression with intermediately superheated steam or fresh steam from the steam generator (1) or a fresh steam duct (16) downstream thereof.
    3. Arrangement for preheating the feedwater of a steam generator (1), the steam of which is expanded in a downstream turbine arrangement (3) in a power station process, wherein steam bleed points, at which part steam quantities disposed at different exergy levels are withdrawable to the power station process, are arranged at at least two physically separate locations (19, A1) of the power station process, wherein the two bleed points disposed at different steam exergy levels are connected with a steam ejector (11), wherein the bleed point of the higher exergy level is connected with the drive steam connection (12) and the other bleed point is connected with the suction steam connection (13) of the steam ejector and wherein the outlet (14) of the steam ejector (11) is coupled with the highest feedwater preheater stage (HDV2; HDV3), characterised in that the drive steam connection (12) of the steam ejector (11) is connected directly with the steam generator (1) or a fresh steam duct (16) downstream of the steam generator and that the suction steam connection (13) of the steam ejector (11) is connected with an intermediate superheater (KZÜ).
    4. Arrangement according to claim 3, characterised in that the outlet (14) of the steam ejector (11) is coupled with the highest stage (HDV; HDV3) of a multi-stage preheater stage (6; 6').
    5. Arrangement according to claim 4, characterised in that a bleed point (A3) for steam disposed at the lower exergy level is provided, that the low exergetic bleed point is connected with the suction steam connection (33) of a second steam ejector (31), that the drive steam ejector connection (32) of the second steam ejector (31) is connected with the steam generator (1), a fresh steam duct (16) downstream thereof or a bleed point of an intermediate superheater (A1) and that the outlet (34) of the steam ejector (31) is coupled with a low feedwater preheater stage (HDV1).
    6. Arrangement according to one of claims 3 to 5, characterised in that means (18) for decoupling the connections (12, 13) of the steam ejector (11) are provided.
    EP96931765A 1995-09-22 1996-09-04 Process and device for preheating the feed water to a steam generator in power station processes Expired - Lifetime EP0851971B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19535318A DE19535318C2 (en) 1995-09-22 1995-09-22 Method and arrangement for preheating the feed water of a steam generator in power plant processes
    DE19535318 1995-09-22
    PCT/EP1996/003869 WO1997011259A1 (en) 1995-09-22 1996-09-04 Process and device for preheating the feed water to a steam generator in power station processes

    Publications (2)

    Publication Number Publication Date
    EP0851971A1 EP0851971A1 (en) 1998-07-08
    EP0851971B1 true EP0851971B1 (en) 2001-12-12

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    EP96931765A Expired - Lifetime EP0851971B1 (en) 1995-09-22 1996-09-04 Process and device for preheating the feed water to a steam generator in power station processes

    Country Status (5)

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    EP (1) EP0851971B1 (en)
    AT (1) ATE210783T1 (en)
    DE (2) DE19535318C2 (en)
    TR (1) TR199800323T1 (en)
    WO (1) WO1997011259A1 (en)

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    US6363270B1 (en) 1995-04-11 2002-03-26 Resmed Limited Monitoring the occurrence of apneic and hypopneic arousals
    CN105736079A (en) * 2015-08-22 2016-07-06 赵东旭 Operation control method of power grid of power generation system

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    DE19736888A1 (en) * 1997-08-25 1998-10-01 Siemens Ag Once-through steam generator start-up method e.g. for gas-and-steam turbine plant
    DE19806238C1 (en) 1998-02-16 1999-04-15 Steag Ag Heat exchanger for power station
    US8091361B1 (en) * 2007-11-05 2012-01-10 Exergetic Systems, Llc Method and apparatus for controlling the final feedwater temperature of a regenerative Rankine cycle using an exergetic heater system
    EP2333256B1 (en) * 2009-12-08 2013-10-16 Alstom Technology Ltd Power plant with CO2 capture and method to operate such power plant
    DE102011078193A1 (en) * 2011-06-28 2013-01-03 Siemens Aktiengesellschaft Additional control tap for a preheater to improve the system dynamics and frequency control in a steam power plant
    FR2984400A1 (en) * 2011-12-19 2013-06-21 Suez Environnement METHOD AND INSTALLATION OF COGENERATION WITH THERMOCOMPRESSION
    DE102013225543B3 (en) 2013-12-11 2015-02-12 Currenta Gmbh & Co.Ohg Steam storage with latent heat storage and steam thermocompressor
    CN105888753B (en) * 2016-05-16 2017-02-22 普瑞森能源科技（北京）股份有限公司 Medium-pressure and low-pressure industrial steam supply method and system through medium-pressure and low-pressure communication butterfly valve adjustment and hot press adoption
    CN106014499B (en) * 2016-05-16 2017-08-29 张曙光 High-low pressure vapour source switching system steam feed pump and control method based on hot pressing principle

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    US3103917A (en) * 1958-04-17 1963-09-17 Rolls Royce Steam generating plant
    GB971195A (en) * 1962-07-23 1964-09-30 Ass Elect Ind Improvements in steam turbine power plants
    US3973402A (en) * 1974-01-29 1976-08-10 Westinghouse Electric Corporation Cycle improvement for nuclear steam power plant
    JPS61126309A (en) * 1984-11-22 1986-06-13 Toshiba Corp Steam power plant
    DE3616797A1 (en) * 1986-05-17 1987-11-19 Koerting Ag Steam turbine system

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    Publication number Priority date Publication date Assignee Title
    US6363270B1 (en) 1995-04-11 2002-03-26 Resmed Limited Monitoring the occurrence of apneic and hypopneic arousals
    CN105736079A (en) * 2015-08-22 2016-07-06 赵东旭 Operation control method of power grid of power generation system

    Also Published As

    Publication number Publication date
    TR199800323T1 (en) 1998-05-21
    DE19535318A1 (en) 1997-03-27
    ATE210783T1 (en) 2001-12-15
    DE19535318C2 (en) 1997-11-27
    DE59608461D1 (en) 2002-01-24
    EP0851971A1 (en) 1998-07-08
    WO1997011259A1 (en) 1997-03-27

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