EP2546476A1 - Steam turbine installation and method for operating the steam turbine installation - Google Patents

Steam turbine installation and method for operating the steam turbine installation Download PDF

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Publication number
EP2546476A1
EP2546476A1 EP11174006A EP11174006A EP2546476A1 EP 2546476 A1 EP2546476 A1 EP 2546476A1 EP 11174006 A EP11174006 A EP 11174006A EP 11174006 A EP11174006 A EP 11174006A EP 2546476 A1 EP2546476 A1 EP 2546476A1
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EP
European Patent Office
Prior art keywords
steam turbine
steam
feedwater
additional
line
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.)
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Application number
EP11174006A
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German (de)
French (fr)
Inventor
Michael Wechsung
Carsten Graeber
Thomas Loeper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP11174006A priority Critical patent/EP2546476A1/en
Priority to US14/131,499 priority patent/US9322298B2/en
Priority to PCT/EP2012/061251 priority patent/WO2013007462A2/en
Priority to EP20120729473 priority patent/EP2705225B1/en
Priority to JP2014519475A priority patent/JP5990581B2/en
Priority to CN201280034950.5A priority patent/CN103649474B/en
Publication of EP2546476A1 publication Critical patent/EP2546476A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • F01K7/44—Use of steam for feed-water heating and another purpose
    • 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
    • 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
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F22D1/325—Schematic arrangements or control devices therefor

Definitions

  • the invention relates to a steam turbine plant and a method for operating the steam turbine plant.
  • a steam turbine plant is used in particular in a thermal power plant for the production of electrical energy.
  • the steam turbine plant to a steam turbine and a steam generator, heated with the feed water and thereby live steam is generated, which is provided to the steam turbine for driving the same.
  • This cycle of the steam turbine plant is conventionally designed so that it has the maximum thermal efficiency at full load of the steam turbine. Other operating conditions, which are below the full load, lead to a correspondingly lower thermal efficiencies.
  • the partial load operation of the steam turbine plant in particular if it is used in the power plant, of high relevance, since for example in the steam turbine plant a power reserve is to be maintained for coping with overload operating conditions.
  • the object of the invention is to provide a steam turbine plant and a method for operating the steam turbine plant, wherein the steam turbine plant has a high thermal efficiency over a wide power range.
  • the steam turbine plant according to the invention has a steam turbine, a steam generator and a process steam-operated feedwater preheating device, the steam turbine having a Matterlastbypasstechnisch with the overload operation of the steam turbine live steam between the steam turbine inlet and the removal point of Why Suitewasservor becamermungs Surprise can be fed, wherein the feedwater pre-heating device has an additional extraction line to the Overload bypass line is connected so that during partial load operation of the steam turbine can be removed from this process steam and the feedwater preheating device for additional feedwater pre-heating is zuglagbar.
  • the method according to the invention for operating the steam turbine plant has the steps of: determining the optimum efficiency and the associated rated power of the steam turbine; as soon as the steam turbine is operated above the rated power, releasing the overload bypass line and isolating the auxiliary tapping line so that live steam is fed between the steam turbine entrance of the steam turbine and the tapping point of the feedwater pre-heater; as soon as the steam turbine is driven below the nominal line, isolating the overload bypass line and releasing the additional tapping line, so that process steam is taken between the steam turbine inlet of the steam turbine and the extraction point and fed to the feedwater pre-heater for additional feedwater pre-heating.
  • the overload bypass line for the operation of the steam turbine at overload and the additional extraction line for the operation of the steam turbine is provided at partial load.
  • a partial mass flow of the live steam is guided around a first part of the high pressure blading of the steam turbine and fed into the steam turbine.
  • the power surplus which is above the rated power, can be generated by the steam turbine without the live steam pressure at the steam turbine inlet being increased compared with the nominal load operating state.
  • the operation of the additional tapping line in part-load operation of the steam turbine removes process steam from the steam turbine which is fed to the feedwater pre-heater for additional feedwater pre-heating in the part-load operation of the steam turbine, thereby raising the feedwater temperature.
  • the thermodynamically induced lowering of the feedwater temperature can be counteracted with decreasing steam turbine power.
  • the fact that a lowering of the thermal efficiency of the steam turbine plant would be accompanied by the feed water temperature reduction, is achieved with the operation of the additional extraction line in partial load operation of the steam turbine that the thermal efficiency of the steam turbine is high.
  • the thermal efficiency is high, so that over a wide power range of the steam turbine whose thermal efficiency is high.
  • the additional extraction line is connected to the overload bypass line, the point of the steam turbine at which both the overload bypass line and the additional extraction line open into the steam turbine, the same point for feeding the live steam in case of overload as well as for the removal of the process steam in the partial load case ,
  • the steam turbine only a single point at which both the overload bypass line and the additional extraction line are attached.
  • the provision of two or more points for feeding the live steam in case of overload and removing the process steam in part load would be structurally complex and only correspondingly costly to implement, so that the steam turbine plant according to the invention with its single junction for the overload bypass line and the additional extraction line easy and is constructed inexpensively.
  • the overload bypass line and the additional tapping line is advantageous equalization of the efficiency curve as a function of the power of the steam turbine achieved.
  • load changes of the steam turbine plant are mobile at a constant and high level of thermal efficiency faster.
  • the load range is large, in which the steam turbine plant is operable at a constant over the time and produced by the steam generator steam temperature.
  • the steam turbine plant has a minimum operating point at low partial load level at which the steam turbine is still operable at stable conditions in the steam turbine plant (Benson minimum load).
  • the additional feedwater in the operating state of the steam turbine below the rated power, is such that the feedwater temperature at the feed water inlet of the steam generator via the load is constant.
  • the additional feedwater pre-heating such that the feedwater temperature at the feed water inlet of the steam generator increases with decreasing power of the steam turbine plant.
  • the increase of the feedwater temperature at the feed water inlet of the steam generator while increasing the amount of feed water at the feed water inlet of the steam generator, the minimum operating point of the steam turbine plant is displaced towards lower part loads.
  • the increase in the feedwater temperature can advantageously be exploited to the limit of the thermal and mechanical load capacity of the steam generator.
  • Any of the steam turbine downstream flue gas process steps, such as a DeNOx system can be operated due to the raised feedwater temperature at a higher flue gas temperature.
  • This feed water preheating device preferably has a feedwater preheater, which is operated by the process steam taken from the sampling point and by the process steam taken with the additional sampling line. This will both operate to operate the feedwater pre-heater supplied to the extracted by the additional extraction line process steam as well as the withdrawn from the sampling process vapor.
  • the feedwater preheating device has a feedwater preheater operated by the process steam withdrawn from the sampling point and an auxiliary preheater operated by the process steam withdrawn with the supplemental sampling line. Due to the fact that the additional preheater is provided in the steam turbine plant, the integration of the additional preheater into the cycle of the steam turbine plant can be performed independently of the integration of the feedwater preheater, so that degrees of freedom can be advantageously used with regard to the optimization of the thermal efficiency of the steam turbine plant. In this case, it is preferable for the additional preheater to be connected in the feedwater flow downstream of the feedwater preheater. Thus, the additional preheater is advantageously downstream of the feedwater pre-heater. This is particularly advantageous because the pressure level of the process steam, with which the additional preheater is operated, is higher than the pressure level of the process steam, with which the feedwater pre-heater is operated.
  • the feedwater preheating means comprises a three-way valve, with which the additional preheater in the feedwater flow can be switched on and switched off from the feedwater flow.
  • a partial flow of the feedwater flow through the additional preheater can be conducted with the three-way valve.
  • an additional extraction valve is preferably installed, with which the mass flow of the process steam in the additional extraction line is controllable.
  • the steam turbine is a high-pressure steam turbine.
  • a steam turbine installation 1 has a steam generator 2, which is provided for generating live steam in the steam turbine installation 1.
  • the steam turbine plant 1 further has a feedwater supply line 3, with the feed water is supplied to the steam generator 2.
  • a superheater 4 is provided, through which the live steam is provided in a supercritical state.
  • the steam turbine plant 1 to a steam turbine 5, which is designed as a high-pressure stage 6 and at the entrance of the live steam via a steam line 7 for driving the steam turbine 5 can be flowed.
  • the mass flow of the live steam can be controlled with a built-in steam line 7 main steam valve 8.
  • the live steam can be relaxed as process steam, whereby the shaft power of the steam turbine 5 can be obtained.
  • the steam turbine 5 has a removal nozzle 9, which opens into a removal line 10, which leads to a feedwater pre-heater 11. Through the removal nozzle 9 process steam can be tapped off from the steam turbine 5, which is guided via the extraction line 10 to the feedwater pre-heater 11.
  • the Feedwater pre-heater 11 is designed as a heat exchanger which is connected in the feedwater supply line 3, so that a preheating of the feedwater can be accomplished by condensing the process steam in the feedwater pre-heater 11.
  • the condensate produced during condensation of the process steam can be discharged via a condensate line 12 in a condensate collecting line 13.
  • the steam turbine 5 has an overload bypass line 14, which branches off from the main steam line 7 upstream of the main steam valve 8 and leads to an overload bypass pipe 15 of the steam turbine 5, which is arranged between the main steam inlet and the outlet nozzle 9.
  • an overload bypass valve 16 is provided with which both the live steam mass flow flowing through the overload bypass line 14 and the overload bypass line 14 can be isolated.
  • the overload bypass line 14 Downstream of the overload bypass valve 16, the overload bypass line 14 opens into an additional extraction line 17, which leads to an additional preheater 19.
  • an additional extraction valve 18 is installed, with which the process steam flowing through the additional extraction line 17 can be controlled in its mass flow and with which the additional extraction line 17 can be isolated.
  • the additional preheater 19 is designed as a heat exchanger, which can be flowed through both from the process steam from the additional extraction line 17 and from the feed water from the feedwater supply line 3.
  • the additional preheater 19 is arranged downstream of the feedwater preheater 11, so that feed water which has already been preheated by the feedwater preheater 11 can be flowed through the additional preheater 19.
  • the additional preheater 19 is connected in parallel to the feedwater supply line 3 via a feedwater preheating line 21.
  • a three-way valve 20 is installed, with which the feedwater flow in the Feedwater supply line 3, which is flowed through the additional preheater 19, is adjustable.
  • the three-way valve 20 is to be switched accordingly when either no feed water, the entire feedwater flow or only a part thereof is to be passed through the additional preheater 19.
  • the steam turbine 5 Over the power range of the steam turbine 5, its thermal efficiency is variable according to their design and construction.
  • the steam turbine 5 is designed so that it should have the maximum thermal efficiency at a given rated power. If the steam turbine is operated above the rated power, the overload bypass valve 16 is opened and the additional intake valve 18 is closed, whereby the overload bypass line 14 is released and the additional extraction line 17 is insulated. As a result, live steam is fed between the steam turbine inlet of the steam turbine 5 and the removal point 9. Once the steam turbine 5 is operated below the rated power, the overload bypass valve 16 is closed, so that the overload bypass line 14 is isolated, and the additional bleed valve 18 is opened, so that the additional extraction line 17 is released.
  • process steam is withdrawn from the steam turbine 5 upstream of the withdrawal nozzle 9, which is fed to the additional preheater 19.
  • the mass flow of the process steam in the additional extraction line 17 is controllable.
  • the process steam flows from the additional extraction line 17 into the additional preheater 19 and is condensed with the release of heat.
  • the resulting condensate is fed to the condensate line 12 of the condensate collecting line 13.
  • the three-way valve 20th Depending on the pressure level of the process steam at the inlet of the additional preheater 19 and the resulting preheating for the feed water at the outlet of the additional preheater 19 in the feedwater preheat pipe 21 and the consequent mixing of the feedwater in the downstream portion of the feedwater supply pipe 3 is the three-way valve 20th to operate accordingly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Turbines (AREA)

Abstract

The installation has a steam turbine (5) having an overload bypass line (14) with which main steam is fed to a feed water pre-heating unit (11) between steam turbine input and extraction point (9) during overload operation of steam turbine. An auxiliary extraction line (17) is connected to overload bypass line in such a way that process steam is able to extract from the steam turbine during partial load operation of steam turbine so as to add extracted process stream to feed water pre-heating unit for additional pre-heating of feed water. An independent claim is included for method for operating steam turbine installation.

Description

Die Erfindung betrifft eine Dampfturbinenanlage und ein Verfahren zum Betreiben der Dampfturbinenanlage.The invention relates to a steam turbine plant and a method for operating the steam turbine plant.

Eine Dampfturbinenanlage findet insbesondere in einem thermischen Kraftwerk zur Erzeugung von elektrischer Energie Anwendung. Insbesondere aus ökologischen und ökonomischen Gesichtspunkten ist es erstrebenswert, die Dampfturbinenanlage bei einem möglichst hohen thermischen Wirkungsgrad zu betreiben. Herkömmlich weist die Dampfturbinenanlage eine Dampfturbine und einen Dampferzeuger auf, mit dem Speisewasser erwärmt und dadurch Frischdampf erzeugt wird, das der Dampfturbine zum Antreiben derselben bereitgestellt wird. Dieser Kreisprozess der Dampfturbinenanlage ist herkömmlich derart ausgelegt, dass er bei Volllast der Dampfturbine den maximalen thermischen Wirkungsgrad hat. Andere Betriebszustände, die unterhalb der Volllast liegen, führen zu einem entsprechend niedrigeren thermischen Wirkungsgraden.A steam turbine plant is used in particular in a thermal power plant for the production of electrical energy. In particular, from an ecological and economic point of view, it is desirable to operate the steam turbine plant with the highest possible thermal efficiency. Conventionally, the steam turbine plant to a steam turbine and a steam generator, heated with the feed water and thereby live steam is generated, which is provided to the steam turbine for driving the same. This cycle of the steam turbine plant is conventionally designed so that it has the maximum thermal efficiency at full load of the steam turbine. Other operating conditions, which are below the full load, lead to a correspondingly lower thermal efficiencies.

Jedoch ist der Teillastbetrieb der Dampfturbinenanlage, insbesondere wenn sie in dem Kraftwerk eingesetzt ist, von hoher Relevanz, da beispielsweise bei der Dampfturbinenanlage eine Leistungsreserve zum Bewältigen von Überlastbetriebszuständen vorzuhalten ist. Somit ist es wünschenswert, die Dampfturbinenanlage über einen breiten Lastbereich mit einem möglichst hohen thermischen Wirkungsgrad zu betreiben.However, the partial load operation of the steam turbine plant, in particular if it is used in the power plant, of high relevance, since for example in the steam turbine plant a power reserve is to be maintained for coping with overload operating conditions. Thus, it is desirable to operate the steam turbine plant over a wide load range with the highest possible thermal efficiency.

Aufgabe der Erfindung ist es, eine Dampfturbinenanlage und ein Verfahren um Betreiben der Dampfturbinenanlage zu schaffen, wobei die Dampfturbinenanlage über einen weiten Leistungsbereich einen hohen thermischen Wirkungsgrad hat.The object of the invention is to provide a steam turbine plant and a method for operating the steam turbine plant, wherein the steam turbine plant has a high thermal efficiency over a wide power range.

Die erfindungsgemäße Dampfturbinenanlage weist eine Dampfturbine, einen Dampferzeuger und eine prozessdampfbetriebene Speisewasservorwärmungseinrichtung auf, wobei die Dampfturbine eine Überlastbypassleitung aufweist, mit der beim Überlastbetrieb der Dampfturbine Frischdampf zwischen dem Dampfturbineneintritt und der Entnahmestelle der Speisewasservorwärmungseinrichtung einspeisbar ist, wobei die Speisewasservorwärmungseinrichtung eine Zusatzentnahmeleitung aufweist, die an die Überlastbypassleitung so angeschlossen ist, dass beim Teillastbetrieb der Dampfturbine von dieser Prozessdampf entnehmbar und der Speisewasservorwärmungseinrichtung zur zusätzlichen Speisewasservorwärmung zufügbar ist. Das erfindungsgemäße Verfahren zum Betreiben der Dampfturbinenanlage weist die Schritte auf: Bestimmen des Wirkungsgradoptimums und der zugeordneten Nennleistung der Dampfturbine; sobald die Dampfturbine oberhalb der Nennleistung betrieben wird, Freigeben der Überlastbypassleitung und Isolieren der Zusatzentnahmeleitung, so dass Frischdampf zwischen dem Dampfturbineneintritt der Dampfturbine und der Entnahmestelle der Speisewasservorwärmungseinrichtung eingespeist wird; sobald die Dampfturbine unterhalb der Nennleitung getrieben wird, Isolieren der Überlastbypassleitung und Freigeben der Zusatzentnahmeleitung, so dass Prozessdampf zwischen dem Dampfturbineneintritt der Dampfturbine und der Entnahmestelle entnommen sowie der Speisewasservorwärmungseinrichtung zur zusätzlichen Speisewasservorwärmung zugeführt wird.The steam turbine plant according to the invention has a steam turbine, a steam generator and a process steam-operated feedwater preheating device, the steam turbine having a Überlastbypassleitung with the overload operation of the steam turbine live steam between the steam turbine inlet and the removal point of Speisewasservorwärmungseinrichtung can be fed, wherein the feedwater pre-heating device has an additional extraction line to the Overload bypass line is connected so that during partial load operation of the steam turbine can be removed from this process steam and the feedwater preheating device for additional feedwater pre-heating is zufügbar. The method according to the invention for operating the steam turbine plant has the steps of: determining the optimum efficiency and the associated rated power of the steam turbine; as soon as the steam turbine is operated above the rated power, releasing the overload bypass line and isolating the auxiliary tapping line so that live steam is fed between the steam turbine entrance of the steam turbine and the tapping point of the feedwater pre-heater; as soon as the steam turbine is driven below the nominal line, isolating the overload bypass line and releasing the additional tapping line, so that process steam is taken between the steam turbine inlet of the steam turbine and the extraction point and fed to the feedwater pre-heater for additional feedwater pre-heating.

Somit ist die Überlastbypassleitung für den Betrieb der Dampfturbine bei Überlast und die Zusatzentnahmeleitung für den Betrieb der Dampfturbine bei Teillast vorgesehen. Im Überlastbetrieb der Dampfturbine wird ein Teilmassenstrom des Frischdampfs um einen ersten Teil der Hochdruckbeschaufelung der Dampfturbine geführt und in die Dampfturbine eingespeist. Dadurch ist von der Dampfturbine der Leistungsüberschuss, der oberhalb der Nennleistung liegt, erzeugbar, ohne dass der Frischdampfdruck am Dampfturbineneintritt verglichen mit dem Nennlastbetriebszustand anzuheben wäre.Thus, the overload bypass line for the operation of the steam turbine at overload and the additional extraction line for the operation of the steam turbine is provided at partial load. In overload operation of the steam turbine, a partial mass flow of the live steam is guided around a first part of the high pressure blading of the steam turbine and fed into the steam turbine. As a result, the power surplus, which is above the rated power, can be generated by the steam turbine without the live steam pressure at the steam turbine inlet being increased compared with the nominal load operating state.

Ferner wird durch den Betrieb der Zusatzentnahmeleitung im Teillastbetrieb der Dampfturbine von der Dampfturbine Prozessdampf entnommen, der der Speisewasservorwärmungseinrichtung zur zusätzlichen Speisewasservorwärmung im Teillastbetrieb der Dampfturbine zugeführt wird, wodurch die Speisewassertemperatur angehoben wird. Damit kann dem thermodynamisch bedingten Absenken der Speisewassertemperatur bei abnehmender Dampfturbinenleistung entgegengewirkt werden. Dadurch, dass mit der Speisewassertemperaturabsenkung eine Absenkung des thermischen Wirkungsgrads der Dampfturbinenanlage einhergehen würde, wird mit dem Betrieb der Zusatzentnahmeleitung im Teillastbetrieb der Dampfturbine erreicht, dass der thermische Wirkungsgrad der Dampfturbine hoch ist. Somit ist sowohl im Überlastbetrieb als auch im Teillastbetrieb der Dampfturbine der thermische Wirkungsgrad hoch, so dass über einen weiten Leistungsbereich der Dampfturbine dessen thermischer Wirkungsgrad hoch ist.Furthermore, the operation of the additional tapping line in part-load operation of the steam turbine removes process steam from the steam turbine which is fed to the feedwater pre-heater for additional feedwater pre-heating in the part-load operation of the steam turbine, thereby raising the feedwater temperature. Thus, the thermodynamically induced lowering of the feedwater temperature can be counteracted with decreasing steam turbine power. The fact that a lowering of the thermal efficiency of the steam turbine plant would be accompanied by the feed water temperature reduction, is achieved with the operation of the additional extraction line in partial load operation of the steam turbine that the thermal efficiency of the steam turbine is high. Thus, both in overload operation and in partial load operation of the steam turbine, the thermal efficiency is high, so that over a wide power range of the steam turbine whose thermal efficiency is high.

Dadurch, dass die Zusatzentnahmeleitung an die Überlastbypassleitung angeschlossen ist, ist die Stelle der Dampfturbine, an der sowohl die Überlastbypassleitung als auch die Zusatzentnahmeleitung in die Dampfturbine münden, dieselbe Stelle für die Einspeisung des Frischdampfs im Überlastfall als auch für die Entnahme des Prozessdampfs im Teillastfall vorgesehen. Somit weist die Dampfturbine lediglich eine einzige Stelle auf, an der sowohl die Überlastbypassleitung als auch die Zusatzentnahmeleitung angebaut sind. Im Gegensatz dazu wäre das Vorsehen von zwei oder mehreren Stellen für das Einspeisen des Frischdampfs im Überlastfall und das Entnehmen des Prozessdampfs im Teillastfall konstruktiv aufwändig und lediglich entsprechend kostenintensiv zu realisieren, so dass die erfindungsgemäße Dampfturbinenanlage mit ihrer einzigen Anschlussstelle für die Überlastbypassleitung und die Zusatzentnahmeleitung einfach und kostengünstig konstruiert ist.Because the additional extraction line is connected to the overload bypass line, the point of the steam turbine at which both the overload bypass line and the additional extraction line open into the steam turbine, the same point for feeding the live steam in case of overload as well as for the removal of the process steam in the partial load case , Thus, the steam turbine only a single point at which both the overload bypass line and the additional extraction line are attached. In contrast, the provision of two or more points for feeding the live steam in case of overload and removing the process steam in part load would be structurally complex and only correspondingly costly to implement, so that the steam turbine plant according to the invention with its single junction for the overload bypass line and the additional extraction line easy and is constructed inexpensively.

Mit dem Vorsehen der Überlastbypassleitung und der Zusatzentnahmeleitung ist vorteilhaft eine Vergleichmäßigung des Wirkungsgradverlaufs in Abhängigkeit der Leistung der Dampfturbine erzielt. Dadurch sind Laständerungen der Dampfturbinenanlage schneller bei gleichbleibendem und hohem Niveau des thermischen Wirkungsgrads fahrbar. Ferner ist der Lastbereich groß, in dem die Dampfturbinenanlage bei einer über die Zeit konstanten und von dem Dampferzeuger erzeugten Frischdampftemperatur betreibbar ist. Außerdem ist vorteilhaft erreicht, dass die Dampfturbinenanlage einen Mindestbetriebspunkt auf niedrigem Teillastniveau hat, bei dem die Dampfturbine noch bei stabilen Verhältnissen in der Dampfturbinenanlage (Benson-Mindestlast) betreibbar ist.With the provision of the overload bypass line and the additional tapping line is advantageous equalization of the efficiency curve as a function of the power of the steam turbine achieved. As a result, load changes of the steam turbine plant are mobile at a constant and high level of thermal efficiency faster. Furthermore, the load range is large, in which the steam turbine plant is operable at a constant over the time and produced by the steam generator steam temperature. In addition, it is advantageously achieved that the steam turbine plant has a minimum operating point at low partial load level at which the steam turbine is still operable at stable conditions in the steam turbine plant (Benson minimum load).

Beim Verfahren zum Betreiben der Dampfturbinenanlage ist es bevorzugt, dass im Betriebszustand der Dampfturbine unterhalb der Nennleistung die zusätzliche Speisewasservorwärmung derart ist, dass die Speisewassertemperatur am Speisewassereintritt des Dampferzeugers über die Last konstant ist. Alternativ bevorzugt ist im Betriebszustand der Dampfturbine unterhalb der Nennleistung die zusätzliche Speisewasservorwärmung derart, dass die Speisewassertemperatur am Speisewassereintritt des Dampferzeugers bei abnehmender Leistung der Dampfturbinenanlage ansteigt. Ferner ist es bevorzugt, dass die Erhöhung der Speisewassertemperatur am Speisewassereintritt des Dampferzeugers bei gleichzeitiger Erhöhung der Speisewassermenge am Speisewassereintritt des Dampferzeugers der Mindestbetriebspunkt der Dampfturbinenanlage hin zu tieferen Teillasten verschiebbar ist. Das Ansteigen der Speisewassertemperatur kann vorteilhaft bis an die Grenze der thermischen und mechanischen Belastbarkeit des Dampferzeugers ausgereizt werden. Eventuell der Dampfturbinenanlage nachgeschaltete Rauchgasprozessschritte, wie beispielsweise eine DeNOx-Anlage, können infolge der angehobenen Speisewassertemperatur bei einer höheren Rauchgastemperatur betrieben werden.In the method for operating the steam turbine plant, it is preferred that in the operating state of the steam turbine below the rated power, the additional feedwater is such that the feedwater temperature at the feed water inlet of the steam generator via the load is constant. Alternatively preferred in the operating condition of the steam turbine below the rated power, the additional feedwater pre-heating such that the feedwater temperature at the feed water inlet of the steam generator increases with decreasing power of the steam turbine plant. Further, it is preferred that the increase of the feedwater temperature at the feed water inlet of the steam generator while increasing the amount of feed water at the feed water inlet of the steam generator, the minimum operating point of the steam turbine plant is displaced towards lower part loads. The increase in the feedwater temperature can advantageously be exploited to the limit of the thermal and mechanical load capacity of the steam generator. Any of the steam turbine downstream flue gas process steps, such as a DeNOx system can be operated due to the raised feedwater temperature at a higher flue gas temperature.

Diese Speisewasservorwärmungseinrichtung weist bevorzugtermaßen einen Speisewasservorwärmer auf, der von dem von der Entnahmestelle entnommenen Prozessdampf und von dem mit der Zusatzentnahmeleitung entnommenen Prozessdampf betrieben ist. Dadurch wird zum Betreiben des Speisewasservorwärmers sowohl der durch die Zusatzentnahmeleitung entnommene Prozessdampf als auch der von der Entnahmestelle entnommene Prozessdampf zugeführt.This feed water preheating device preferably has a feedwater preheater, which is operated by the process steam taken from the sampling point and by the process steam taken with the additional sampling line. This will both operate to operate the feedwater pre-heater supplied to the extracted by the additional extraction line process steam as well as the withdrawn from the sampling process vapor.

Alternativ weist die Speisewasservorwärmungseinrichtung einen Speisewasservorwärmer, der von den von der Entnahmestelle entnommenen Prozessdampf betrieben ist, und einen Zusatzvorwärmer auf, der von dem mit der Zusatzentnahmeleitung entnommenen Prozessdampf betrieben ist. Dadurch, dass der Zusatzvorwärmer in der Dampfturbinenanlage vorgesehen ist, kann die Einbindung des Zusatzvorwärmers in den Kreisprozess der Dampfturbinenanlage unabhängig von der Einbindung des Speisewasservorwärmers vorgenommen sein, so dass hinsichtlich der Optimierung des thermischen Wirkungsgrads der Dampfturbinenanlage Freiheitsgrade vorteilhaft genutzt werden können. Hierbei ist es bevorzugt, dass der Zusatzvorwärmer im Speisewasserstrom stromab des Speisewasservorwärmers geschaltet ist. Somit ist der Zusatzvorwärmer vorteilhaft dem Speisewasservorwärmer nachgeschaltet. Dies ist insbesondere deshalb vorteilhaft, da das Druckniveau des Prozessdampfs, mit dem der Zusatzvorwärmer betrieben ist, höher ist, als das Druckniveau des Prozessdampfs, mit dem der Speisewasservorwärmer betrieben ist.Alternatively, the feedwater preheating device has a feedwater preheater operated by the process steam withdrawn from the sampling point and an auxiliary preheater operated by the process steam withdrawn with the supplemental sampling line. Due to the fact that the additional preheater is provided in the steam turbine plant, the integration of the additional preheater into the cycle of the steam turbine plant can be performed independently of the integration of the feedwater preheater, so that degrees of freedom can be advantageously used with regard to the optimization of the thermal efficiency of the steam turbine plant. In this case, it is preferable for the additional preheater to be connected in the feedwater flow downstream of the feedwater preheater. Thus, the additional preheater is advantageously downstream of the feedwater pre-heater. This is particularly advantageous because the pressure level of the process steam, with which the additional preheater is operated, is higher than the pressure level of the process steam, with which the feedwater pre-heater is operated.

Außerdem ist es bevorzugt, dass die Speisewasservorwärmungseinrichtung ein Dreiwegeventil aufweist, mit dem der Zusatzvorwärmer in dem Speisewasserstrom zuschaltbar und von dem Speisewasserstrom abschaltbar ist. Hierbei ist bevorzugtermaßen mit dem Dreiwegeventil ein Teilstrom des Speisewasserstroms durch den Zusatzvorwärmer leitbar. Somit ist vorteilhaft mit dem Dreiwegeventil der gesamte Speisewasserstrom entweder an dem Zusatzvorwärmer vorbei, beispielsweise im Überlastbetrieb der Dampfturbine, oder teilweise oder ganz durch den Zusatzvorwärmer leitbar, beispielsweise im Teillastbetrieb der Dampfturbine. Somit kann hinsichtlich der Optimierung des thermischen Wirkungsgrads der Dampfturbinenanlage in jedem Betriebszustand durch eine entsprechende Betätigung des Dreiwegeventils und einer entsprechenden Dimensionierung des Teilstroms des Speisewasserstroms durch den Zusatzvorwärmer optimiert werden.In addition, it is preferred that the feedwater preheating means comprises a three-way valve, with which the additional preheater in the feedwater flow can be switched on and switched off from the feedwater flow. In this case, preferably a partial flow of the feedwater flow through the additional preheater can be conducted with the three-way valve. Thus, advantageous with the three-way valve, the entire feedwater flow either past the Zusatzvorwärmer, for example in overload operation of the steam turbine, or partially or completely by the Zusatzvorwärmer conductive, for example, in partial load operation of the steam turbine. Thus, with regard to the optimization of the thermal efficiency of the steam turbine plant in each operating state by a corresponding actuation of the three-way valve and a corresponding dimensioning the partial flow of the feedwater flow can be optimized by the additional preheater.

In der Zusatzentnahmeleitung ist bevorzugtermaßen ein Zusatzentnahmeventil eingebaut, mit dem der Massenstrom des Prozessdampfs in der Zusatzentnahmeleitung steuerbar ist. Außerdem ist es bevorzugt, dass die Dampfturbine eine Hochdruckdampfturbine ist.In the additional extraction line an additional extraction valve is preferably installed, with which the mass flow of the process steam in the additional extraction line is controllable. In addition, it is preferable that the steam turbine is a high-pressure steam turbine.

Im Folgenden wird eine bevorzugte Ausführungsform der erfindungsgemäßen Dampfturbinenanlage anhand der beigefügten schematischen Zeichnung erläutert. Es zeigt die Figur ein Wärmeschaltbild der Ausführungsform der Dampfturbinenanlage.In the following, a preferred embodiment of the steam turbine plant according to the invention will be explained with reference to the accompanying schematic drawing. The figure shows a thermal circuit diagram of the embodiment of the steam turbine plant.

Wie es aus der Figur ersichtlich ist, weist eine Dampfturbinenanlage 1 einen Dampferzeuger 2 auf, der zur Erzeugung von Frischdampf in der Dampfturbinenanlage 1 vorgesehen ist. Die Dampfturbinenanlage 1 weist ferner eine Speisewasserzuführleitung 3 auf, mit der Speisewasser dem Dampferzeuger 2 zugeführt wird. Stromab des Dampfererzeugers 2 ist ein Überhitzer 4 vorgesehen, durch den der Frischdampf in überkritischem Zustand bereitgestellt ist.As can be seen from the figure, a steam turbine installation 1 has a steam generator 2, which is provided for generating live steam in the steam turbine installation 1. The steam turbine plant 1 further has a feedwater supply line 3, with the feed water is supplied to the steam generator 2. Downstream of the steam generator 2, a superheater 4 is provided, through which the live steam is provided in a supercritical state.

Ferner weist die Dampfturbinenanlage 1 eine Dampfturbine 5 auf, die als eine Hochdruckstufe 6 ausgebildet ist und an deren Eintritt der Frischdampf via eine Frischdampfleitung 7 zum Antreiben der Dampfturbine 5 einströmbar ist. Der Massenstrom des Frischdampfs ist mit einem in der Frischdampfleitung 7 eingebauten Frischdampfventil 8 steuerbar. In der Dampfturbine 5 ist der Frischdampf als Prozessdampf entspannbar, wodurch die Wellenleistung der Dampfturbine 5 gewinnbar ist.Furthermore, the steam turbine plant 1 to a steam turbine 5, which is designed as a high-pressure stage 6 and at the entrance of the live steam via a steam line 7 for driving the steam turbine 5 can be flowed. The mass flow of the live steam can be controlled with a built-in steam line 7 main steam valve 8. In the steam turbine 5, the live steam can be relaxed as process steam, whereby the shaft power of the steam turbine 5 can be obtained.

Die Dampfturbine 5 weist einen Entnahmestutzen 9 auf, der in eine Entnahmeleitung 10 mündet, die zu einem Speisewasservorwärmer 11 führt. Durch den Entnahmestutzen 9 ist von der Dampfturbine 5 Prozessdampf abzapfbar, der via die Entnahmeleitung 10 zu dem Speisewasservorwärmer 11 geführt wird. Der Speisewasservorwärmer 11 ist als ein Wärmetauscher ausgeführt, der in die Speisewasserzuführleitung 3 geschaltet ist, so dass unter Kondensieren des Prozessdampfs in dem Speisewasservorwärmer 11 eine Vorwärmung des Speisewassers bewerkstelligbar ist. Das beim Kondensieren des Prozessdampfs anfallende Kondensat ist über eine Kondensatleitung 12 in einer Kondensatsammelleitung 13 abführbar.The steam turbine 5 has a removal nozzle 9, which opens into a removal line 10, which leads to a feedwater pre-heater 11. Through the removal nozzle 9 process steam can be tapped off from the steam turbine 5, which is guided via the extraction line 10 to the feedwater pre-heater 11. Of the Feedwater pre-heater 11 is designed as a heat exchanger which is connected in the feedwater supply line 3, so that a preheating of the feedwater can be accomplished by condensing the process steam in the feedwater pre-heater 11. The condensate produced during condensation of the process steam can be discharged via a condensate line 12 in a condensate collecting line 13.

Die Dampfturbine 5 weist eine Überlastbypassleitung 14 auf, die stromauf des Frischdampfventils 8 von der Frischdampfleitung 7 abzweigt und zu einem Überlastbypassstutzen 15 der Dampfturbine 5 führt, der zwischen dem Frischdampfeintritt und dem Entnahmestutzen 9 angeordnet ist. In der Überlastbypassleitung 14 ist ein Überlastbypassventil 16 vorgesehen, mit dem sowohl der durch die Überlastbypassleitung 14 strömende Frischdampfmassenstrom steuerbar als auch die Überlastbypassleitung 14 isolierbar ist.The steam turbine 5 has an overload bypass line 14, which branches off from the main steam line 7 upstream of the main steam valve 8 and leads to an overload bypass pipe 15 of the steam turbine 5, which is arranged between the main steam inlet and the outlet nozzle 9. In the overload bypass line 14, an overload bypass valve 16 is provided with which both the live steam mass flow flowing through the overload bypass line 14 and the overload bypass line 14 can be isolated.

Stromab des Überlastbypassventils 16 mündet die Überlastbypassleitung 14 in eine Zusatzentnahmeleitung 17, die zu einem Zusatzvorwärmer 19 führt. In der Zusatzentnahmeleitung 17 ist ein Zusatzentnahmeventil 18 eingebaut, mit dem der durch die Zusatzentnahmeleitung 17 strömende Prozessdampf in seinem Massenstrom steuerbar ist und mit der die Zusatzentnahmeleitung 17 isolierbar ist.Downstream of the overload bypass valve 16, the overload bypass line 14 opens into an additional extraction line 17, which leads to an additional preheater 19. In the additional extraction line 17, an additional extraction valve 18 is installed, with which the process steam flowing through the additional extraction line 17 can be controlled in its mass flow and with which the additional extraction line 17 can be isolated.

Der Zusatzvorwärmer 19 ist als ein Wärmetauscher ausgebildet, der sowohl von dem Prozessdampf aus der Zusatzentnahmeleitung 17 als auch von dem Speisewasser aus der Speisewasserzuführleitung 3 durchströmbar ist. Der Zusatzvorwärmer 19 ist stromab des Speisewasservorwärmers 11 angeordnet, so dass durch den Zusatzvorwärmer 19 bereits von dem Speisewasservorwärmer 11 vorgewärmtes Speisewasser strömbar ist. Der Zusatzvorwärmer 19 ist parallel zu der Speisewasserzuführleitung 3 via eine Speisewasservorwärmleitung 21 geschaltet. An der stromauf liegenden Mündungsstelle der Speisewasservorwärmleitung 21 und der Speisewasserzuführleitung 3 ist ein Dreiwegeventil 20 eingebaut, mit dem der Speisewasserstrom in der Speisewasserzuführleitung 3, der durch den Zusatzvorwärmer 19 strömbar ist, regelbar ist. Somit ist das Dreiwegeventil 20 entsprechend zu schalten, wenn entweder kein Speisewasser, der gesamte Speisewasserstrom oder nur ein Teil davon durch den Zusatzvorwärmer 19 geleitet werden soll.The additional preheater 19 is designed as a heat exchanger, which can be flowed through both from the process steam from the additional extraction line 17 and from the feed water from the feedwater supply line 3. The additional preheater 19 is arranged downstream of the feedwater preheater 11, so that feed water which has already been preheated by the feedwater preheater 11 can be flowed through the additional preheater 19. The additional preheater 19 is connected in parallel to the feedwater supply line 3 via a feedwater preheating line 21. At the upstream mouth of the feedwater preheating line 21 and the feedwater supply line 3, a three-way valve 20 is installed, with which the feedwater flow in the Feedwater supply line 3, which is flowed through the additional preheater 19, is adjustable. Thus, the three-way valve 20 is to be switched accordingly when either no feed water, the entire feedwater flow or only a part thereof is to be passed through the additional preheater 19.

Über den Leistungsbereich der Dampfturbine 5 ist ihr thermischer Wirkungsgrad entsprechend ihrer Auslegung und Bauweise variabel. Die Dampfturbine 5 ist so ausgelegt, dass sie bei einer vorgegebenen Nennleistung den maximalen thermischen Wirkungsgrad haben soll. Wird die Dampfturbine oberhalb der Nennleistung betrieben, wird das Überlastbypassventil 16 geöffnet und das Zusatzentnahmeventil 18 geschlossen, wodurch die Überlastbypassleitung 14 freigegeben und die Zusatzentnahmeleitung 17 isoliert ist. Dadurch wird Frischdampf zwischen dem Dampfturbineneintritt der Dampfturbine 5 und der Entnahmestelle 9 eingespeist. Sobald die Dampfturbine 5 unterhalb der Nennleistung betrieben wird, wird das Überlastbypassventil 16 geschlossen, so dass die Überlastbypassleitung 14 isoliert ist, und das Zusatzentnahmeventil 18 geöffnet, so dass die Zusatzentnahmeleitung 17 freigegeben ist. Dadurch wird von der Dampfturbine 5 stromauf des Entnahmestutzens 9 Prozessdampf entnommen, der dem Zusatzvorwärmer 19 zugeführt wird. Durch eine entsprechende Stellung des Zusatzentnahmeventils 18 ist der Massenstrom des Prozessdampfs in der Zusatzentnahmeleitung 17 steuerbar. Der Prozessdampf strömt von der Zusatzentnahmeleitung 17 in den Zusatzvorwärmer 19 und wird unter Wärmeabgabe kondensiert. Das dabei entstehende Kondensat wird mit der Kondensatleitung 12 der Kondensatsammelleitung 13 zugeführt.Over the power range of the steam turbine 5, its thermal efficiency is variable according to their design and construction. The steam turbine 5 is designed so that it should have the maximum thermal efficiency at a given rated power. If the steam turbine is operated above the rated power, the overload bypass valve 16 is opened and the additional intake valve 18 is closed, whereby the overload bypass line 14 is released and the additional extraction line 17 is insulated. As a result, live steam is fed between the steam turbine inlet of the steam turbine 5 and the removal point 9. Once the steam turbine 5 is operated below the rated power, the overload bypass valve 16 is closed, so that the overload bypass line 14 is isolated, and the additional bleed valve 18 is opened, so that the additional extraction line 17 is released. As a result, process steam is withdrawn from the steam turbine 5 upstream of the withdrawal nozzle 9, which is fed to the additional preheater 19. By a corresponding position of the additional extraction valve 18, the mass flow of the process steam in the additional extraction line 17 is controllable. The process steam flows from the additional extraction line 17 into the additional preheater 19 and is condensed with the release of heat. The resulting condensate is fed to the condensate line 12 of the condensate collecting line 13.

In Abhängigkeit des Druckniveaus des Prozessdampfs am Eintritt des Zusatzvorwärmers 19 und der sich daraus ergebenden Vorwärmung für das Speisewasser am Austritt des Zusatzvorwärmers 19 in der Speisewasservorwärmungsleitung 21 bzw. die sich daraus ergebende Vermischung des Speisewassers in dem stromab liegenden Abschnitt der Speisewasserzuführleitung 3 ist das Dreiwegeventil 20 entsprechend zu betätigen.Depending on the pressure level of the process steam at the inlet of the additional preheater 19 and the resulting preheating for the feed water at the outlet of the additional preheater 19 in the feedwater preheat pipe 21 and the consequent mixing of the feedwater in the downstream portion of the feedwater supply pipe 3 is the three-way valve 20th to operate accordingly.

Claims (12)

Dampfturbinenanlage mit einer Dampfturbine (5), einem Dampferzeuger (2) und einer prozessdampfbetriebenen Speisewasservorwärmungseinrichtung (9-13, 17-21),
wobei die Dampfturbine (5) eine Überlastbypassleitung (14) aufweist, mit der beim Überlastbetrieb der Dampfturbine (5) Frischdampf zwischen dem Dampfturbineneintritt und der Entnahmestelle (9) der Speisewasservorwärmungseinrichtung (9-13, 17-21) einspeisbar ist,
dadurch gekennzeichnet, dass
die Speisewasservorwärmungseinrichtung (9-13, 17-21) eine Zusatzentnahmeleitung (17) aufweist, die an die Überlastbypassleitung (14) so angeschlossen ist, dass beim Teillastbetrieb der Dampfturbine (5) von dieser Prozessdampf entnehmbar und der Speisewasservorwärmungseinrichtung (9-13, 17-21) zur zusätzlichen Speisewasservorwärmung zufügbar ist.Steam turbine plant comprising a steam turbine (5), a steam generator (2) and a process steam-operated feed water preheating device (9-13, 17-21),
wherein the steam turbine (5) has an overload bypass line (14) with which live steam can be fed in between the steam turbine inlet and the removal point (9) of the feedwater preheating device (9-13, 17-21) during overload operation of the steam turbine (5),
characterized in that
the feedwater preheating device (9-13, 17-21) has an additional removal line (17) which is connected to the overload bypass line (14) so that during partial load operation of the steam turbine (5) it can be removed from this process steam and the feedwater preheating device (9-13, 17 -21) can be added for additional feed water preheating. Dampfturbinenanlage gemäß Anspruch 1,
wobei die Speisewasservorwärmungseinrichtung (9-13, 17-21) einen Speisewasservorwärmer (11) aufweist, der von dem von der Entnahmestelle (9) entnommenen Prozessdampf und von dem mit der Zusatzentnahmeleitung (17) entnommenen Prozessdampf betrieben ist.Steam turbine plant according to claim 1,
wherein the feedwater preheating means (9-13, 17-21) comprises a feedwater preheater (11) operated by the process steam taken from the sampling point (9) and by the process steam withdrawn with the additional sampling line (17). Dampfturbinenanlage gemäß Anspruch 1,
wobei die Speisewasservorwärmungseinrichtung (9-13, 17-21) einen Speisewasservorwärmer (11), der von dem von der Entnahmestelle (9) entnommenen Prozessdampf betrieben ist, und einen Zusatzvorwärmer (19) aufweist, der von dem mit der Zusatzentnahmeleitung (17) entnommenen Prozessdampf betrieben ist.Steam turbine plant according to claim 1,
wherein the feedwater pre-heater (9-13, 17-21) has a feedwater pre-heater (11) operated by the process steam withdrawn from the extraction point (9) and an auxiliary preheater (19) taken from that with the auxiliary extraction line (17) Process steam is operated. Dampfturbinenanlage gemäß Anspruch 3,
wobei der Zusatzvorwärmer (19) im Speisewasserstrom stromab des Speisewasservorwärmers (11) geschaltet ist.Steam turbine plant according to claim 3,
wherein the additional preheater (19) is connected in the feedwater flow downstream of the feedwater preheater (11). Dampfturbinenanlage gemäß Anspruch 3 oder 4,
wobei die Speisewasservorwärmungseinrichtung (9-13, 17-21) ein Dreiwegeventil (21) aufweist, mit dem der Zusatzvorwärmer (19) in den Speisewasserstrom zuschaltbar und von dem Speisewasserstrom abschaltbar ist.Steam turbine plant according to claim 3 or 4,
wherein the feed water preheating means (9-13, 17-21) comprises a three-way valve (21) with which the additional preheater (19) can be switched into the feedwater flow and switched off from the feedwater flow. Dampfturbinenanlage gemäß Anspruch 5,
wobei mit dem Dreiwegeventil (20) ein Teilstrom des Speisewasserstroms durch den Zusatzvorwärmer (19) leitbar ist.Steam turbine plant according to claim 5,
wherein with the three-way valve (20) a partial flow of the feedwater flow through the additional preheater (19) is conductive. Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 6, wobei in der Zusatzentnahmeleitung (17) ein Zusatzentnahmeventil (18) eingebaut ist, mit dem der Massenstrom des Prozessdampfs in der Zusatzentnahmeleitung (17) steuerbar ist.Steam turbine plant according to one of claims 1 to 6, wherein in the additional extraction line (17) an additional extraction valve (18) is installed, with which the mass flow of the process steam in the additional extraction line (17) is controllable. Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 7, wobei die Dampfturbine (5) eine Hochdruckdampfturbine ist.Steam turbine plant according to one of claims 1 to 7, wherein the steam turbine (5) is a high-pressure steam turbine. Verfahren zum Betreiben einer Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 8, mit den Schritten: - Bestimmen des Wirkungsgradoptimums und der zugeordneten Nennleistung der Dampfturbine (5); - sobald die Dampfturbine (5) oberhalb der Nennleistung betrieben wird, Freigeben der Überlastbypassleitung (14) und Isolieren der Zusatzentnahmeleitung (17), so dass Frischdampf zwischen dem Dampfturbineneintritt der Dampfturbine (5) und der Entnahmestelle (9) der Speisewasservorwärmungseinrichtung (9-13, 17-21) eingepeist wird; - sobald die Dampfturbine (5) unterhalb der Nennleistung betrieben wird, Isolieren der Überlastbypassleitung (14) und Freigeben der Zusatzentnahmeleitung (17), so dass Prozessdampf zwischen dem Dampfturbineneintritt der Dampfturbine (5) und der Entnahmestelle (9) entnommen sowie der Speisewasservorwärmungseinrichtung (9-13, 17-21) zur zusätzlichen Speisewasservorwärmung zugeführt wird. A method of operating a steam turbine plant according to any one of claims 1 to 8, comprising the steps of: - Determining the optimum efficiency and the associated rated power of the steam turbine (5); - When the steam turbine (5) is operated above the rated power, releasing the overload bypass line (14) and isolating the additional extraction line (17), so that live steam between the steam turbine inlet of the steam turbine (5) and the removal point (9) of the feedwater preheating device (9-13 , 17-21) is fed; - As soon as the steam turbine (5) is operated below the rated power, isolating the overload bypass line (14) and releasing the additional tapping line (17), so that process steam between the steam turbine inlet of the steam turbine (5) and the removal point (9) removed and the feedwater pre-heater (9 -13, 17-21) for additional feedwater pre-heating. Verfahren gemäß Anspruch 9,
wobei im Betriebszustand der Dampfturbine (5) unterhalb der Nennleistung die zusätzliche Speisewasservorwärmung derart ist, dass die Speisewassertemperatur am Speisewassereintritt des Dampferzeugers (2) über die Last konstant ist.Method according to claim 9,
wherein in the operating state of the steam turbine (5) below the rated power, the additional feedwater preheating is such that the feedwater temperature at the feedwater inlet of the steam generator (2) via the load is constant. Verfahren gemäß Anspruch 9,
wobei im Betriebszustand der Dampfturbine (5) unterhalb Nennleistung die zusätzliche Speisewasservorwärmung derart ist, dass die Speisewassertemperatur am Speisewassereintritt des Dampferzeugers (2) bei abnehmender Leistung der Dampfturbinenanlage (1) ansteigt.Method according to claim 9,
wherein in the operating state of the steam turbine (5) below rated power, the additional feedwater preheating is such that the feedwater temperature at the feed water inlet of the steam generator (2) increases with decreasing power of the steam turbine plant (1). Verfahren gemäß Anspruch 11,
wobei die Erhöhung der Speisewassertemperatur am Speisewassereintritt des Dampferzeugers (2) bei gleichzeitiger Erhöhung der Speisewassermenge am Speisewassereintritt des Dampferzeugers (2) der Mindestbetriebspunkt der Dampfturbinenanlage (1) hin zu tieferen Teillasten verschiebbar ist.Method according to claim 11,
wherein the increase of the feedwater temperature at the feed water inlet of the steam generator (2) while increasing the amount of feed water at the feed water inlet of the steam generator (2) of the minimum operating point of the steam turbine plant (1) is displaceable towards lower part loads.
EP11174006A 2011-07-14 2011-07-14 Steam turbine installation and method for operating the steam turbine installation Withdrawn EP2546476A1 (en)

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US14/131,499 US9322298B2 (en) 2011-07-14 2012-06-14 Steam turbine installation and method for operating the steam turbine installation
PCT/EP2012/061251 WO2013007462A2 (en) 2011-07-14 2012-06-14 Steam turbine installation and method for operating the steam turbine installation
EP20120729473 EP2705225B1 (en) 2011-07-14 2012-06-14 Steam turbine installation and method for operating the steam turbine installation
JP2014519475A JP5990581B2 (en) 2011-07-14 2012-06-14 Steam turbine equipment and driving method of the steam turbine equipment
CN201280034950.5A CN103649474B (en) 2011-07-14 2012-06-14 Steam turbine installation and the method for running steam turbine installation

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CN103649474A (en) 2014-03-19
US9322298B2 (en) 2016-04-26
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