EP2705225A2 - Steam turbine installation and method for operating the steam turbine installation - Google Patents

Steam turbine installation and method for operating the steam turbine installation

Info

Publication number
EP2705225A2
EP2705225A2 EP12729473.4A EP12729473A EP2705225A2 EP 2705225 A2 EP2705225 A2 EP 2705225A2 EP 12729473 A EP12729473 A EP 12729473A EP 2705225 A2 EP2705225 A2 EP 2705225A2
Authority
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.)
Granted
Application number
EP12729473.4A
Other languages
German (de)
French (fr)
Other versions
EP2705225B1 (en
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
Original Assignee
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 EP20120729473 priority Critical patent/EP2705225B1/en
Publication of EP2705225A2 publication Critical patent/EP2705225A2/en
Application granted granted Critical
Publication of EP2705225B1 publication Critical patent/EP2705225B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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
    • F01K7/40—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
    • 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
    • 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 Ver ⁇ drive for operating the steam turbine plant.
  • a steam turbine plant is used in particular in a thermi ⁇ thermal power plant for generating electrical energy use.
  • the steam turbine plant has a steam turbine ⁇ and a steam generator, heated with the feed water, thereby generating live steam, which is provided to the steam turbine for driving the same.
  • This cycle of the steam turbine plant is commonly designed such that it has the maxi ⁇ paint thermal efficiency at full load of the steam turbine. Other operating conditions, which are below the full load, lead to an accordingly entspre ⁇ lower thermal efficiencies.
  • the partial load operation of the steam turbine plant in particular ⁇ when it is used in the power plant, is 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 to operate the steam turbine plant to sheep ⁇ fen, wherein the steam turbine plant over a wide Leis ⁇ processing section has a high thermal efficiency.
  • the steam turbine system according to the invention has a Dampftur ⁇ bine, a steam generator and a process-steam-powered Suiteingervor maybermungs adopted, wherein the steam turbine comprises an overload bypass line, with the steam between the steam inlet and the discharge point of the Suiteiganvor maybermungs adopted be fed when overload operation of the steam turbine, wherein the Suiteiganvorierrmungs adopted a Additional tapping line has, which is connected to the overload bypass line so that during partial load operation of the steam turbine can be removed from this process steam and the feedwater pre-heating 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 additional tapping line, so that live steam is fed between the steam turbine inlet of the steam turbine and the extraction point of the feedwater pre-heater; as soon as the steam turbine is driven below the nominal line, iso ⁇ lieren the overload bypass line and releasing the additional extraction line, so that process steam is taken between the steam turbine inlet of the steam turbine and the extraction point and the feedwater preheating device is supplied to the additional feedwater preheating.
  • thermodynamically induced lowering of the feedwater temperature can be counteracted with decreasing steam turbine power.
  • 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 ⁇ cal efficiency of the steam turbine is high.
  • the thermal efficiency is high, so that its thermal efficiency is high over a wide power range of the steam turbine.
  • the point of the steam turbine at which both the overload bypass line and the additional extraction line open into the steam turbine is the same point for feeding the live steam in case of overload as well as for removing the process steam Partial load case provided.
  • the steam turbine to only a one ⁇ Zige point where both the overload bypass line and the additional extraction line are grown.
  • 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 steam turbine plant is formed with a control system.
  • an equalization of the efficiency profile as a function of the power of the Dampftur ⁇ bine is advantageously achieved.
  • load changes of the steam turbine systems can be moved faster at a constant and high level of thermal efficiency.
  • 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 a low partial load level at which the steam turbine can still be operated under stable conditions in the steam turbine plant (Benson minimum load).
  • the additional feedwater is such that the feedwater temperature at the feed water inlet of the steam generator via the load is constant.
  • the additional feedwater such that the feed water temperature increases in the operating condition of the steam turbine under ⁇ half of the rated output at the feedwater inlet of the steam generator with decreasing power of the steam turbine plant.
  • the rise in the feedwater temperature can advantageously be exploited to the limit of the thermal and mechanical load capacity of the steam generator.
  • Any flue gas process steps downstream of the steam turbine plant, such as a DeNOx plant, can be operated at a higher flue gas temperature as a result of the raised feedwater temperature.
  • This feedwater pre-heater preferably has a feedwater pre-heater that is different from that of the As a result, the process steam taken from the additional extraction line and the process steam removed from the extraction point are supplied to operate the feedwater pre-heater.
  • 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.
  • theificatvorier in the feed water stream ⁇ is connected downstream of the feedwater preheater.
  • the additional preheater is advantageously downstream of the feedwater ⁇ servoruzar. 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 device has 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 sampling valve is preferably incorporated extent to which the mass flow of the Pro ⁇ zessdampfs is controllable in the additional removal pipe.
  • the steam turbine plant 1 has a feedwater supply line 3, with which 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.
  • the steam turbine plant 1 to a steam turbine 5, which is designed as a high pressure stage 6 and at de ⁇ ren entry of live steam via a main steam line 7 for driving the steam turbine 5 can be flowed.
  • the mass flow of the live steam is controllable with a built-in Frischdampflei ⁇ device 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 withdrawal line 10, which leads to a feedwater supply. warmer 11 leads.
  • the feedwater heater 11 is designed as a heat exchanger leads connected to the Lucaswasserzu slaughtertechnisch 3, so that preheating of the feed water in the feed water preheater 11 is bewerkstelligbar ⁇ under condensing the process steam.
  • 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 upstream of the main steam valve 8 from the Frischdampflei ⁇ device 7 and leads to a Studentslastbypassstutzen 15 of the steam turbine 5, which is arranged between the live steam inlet and the sampling nozzle 9.
  • an overload bypass valve 16 is provided, with which both the fresh steam mass flow flowing through the overload bypass line 14 controllable and the overload bypass line 14 can be isolated.
  • the Matterlastby ⁇ pass line 14 opens into an additional extraction line 17, which leads to a relievevortude 19.
  • an additional extraction valve 18 is installed, with which the process steam flowing through the additional extraction line 17 is controllable in its mass flow and with which the Rajentnahiemei ⁇ device 17 is isolatable.
  • 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 can be flowed through the additional preheater 19, can be regulated.
  • 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.
  • 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.
  • the three-way valve 20 is 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 invention relates to a steam turbine installation that has a steam turbine (5), a steam generator (2) and a feed water pre-heating unit (9-13, 17-21) operated by process steam, the steam turbine (5) having an overload bypass line (14) with which main steam can be fed to the feed water pre-heating unit (9-13, 17-21) between the steam turbine input and the extraction point (9) during overload operation of the steam turbine (5), characterised in that the feed water pre-heating unit (9-13, 17-21) has an auxiliary extraction line (17) that is connected to the overload bypass line (14) in such a way that process steam can be extracted from the steam turbine (5) during partial load operation of the steam turbine (5) and added to the feed water pre-heating unit (9-13, 17-21) for the additional pre-heating of feed water.

Description

Beschreibung description
Dampfturbinenanlage und Verfahren zum Betreiben der Dampfturbinenanlage Steam turbine plant and method for operating the steam turbine plant
Die Erfindung betrifft eine Dampfturbinenanlage und ein Ver¬ fahren zum Betreiben der Dampfturbinenanlage . The invention relates to a steam turbine plant and a Ver ¬ drive for operating the steam turbine plant.
Eine Dampfturbinenanlage findet insbesondere in einem thermi¬ schen 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 betrei¬ ben. Herkömmlich weist die Dampfturbinenanlage eine Dampftur¬ bine 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 maxi¬ malen thermischen Wirkungsgrad hat. Andere Betriebszustände, die unterhalb der Volllast liegen, führen zu einem entspre¬ chend niedrigeren thermischen Wirkungsgraden. A steam turbine plant is used in particular in a thermi ¬ thermal power plant for generating electrical energy use. In particular, environmental and economic point of view it is desirable that the steam turbine plant with a very high thermal efficiency to Operator Op ¬ ben. Conventionally, the steam turbine plant has a steam turbine ¬ and a steam generator, heated with the feed water, thereby generating live steam, which is provided to the steam turbine for driving the same. This cycle of the steam turbine plant is commonly designed such that it has the maxi ¬ paint thermal efficiency at full load of the steam turbine. Other operating conditions, which are below the full load, lead to an accordingly entspre ¬ lower thermal efficiencies.
Jedoch ist der Teillastbetrieb der Dampfturbinenanlage, ins¬ besondere 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 Dampfturbi¬ nenanlage über einen breiten Lastbereich mit einem möglichst hohen thermischen Wirkungsgrad zu betreiben. However, the partial load operation of the steam turbine plant, in particular ¬ when it is used in the power plant, is 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 turbinen ¬ nenanlage 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 schaf¬ fen, wobei die Dampfturbinenanlage über einen weiten Leis¬ tungsbereich einen hohen thermischen Wirkungsgrad hat. Die erfindungsgemäße Dampfturbinenanlage weist eine Dampftur¬ bine, 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 Speisewasservor- wärmungseinrichtung einspeisbar ist, wobei die Speisewasser- vorwärmungseinrichtung 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 Spei- sewasservorwärmungseinrichtung eingespeist wird; sobald die Dampfturbine unterhalb der Nennleitung getrieben wird, Iso¬ lieren 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 object of the invention is to provide a steam turbine plant and a method to operate the steam turbine plant to sheep ¬ fen, wherein the steam turbine plant over a wide Leis ¬ processing section has a high thermal efficiency. The steam turbine system according to the invention has a Dampftur ¬ bine, a steam generator and a process-steam-powered Speisewasservorwärmungseinrichtung, wherein the steam turbine comprises an overload bypass line, with the steam between the steam inlet and the discharge point of the Speisewasservorwärmungseinrichtung be fed when overload operation of the steam turbine, wherein the Speisewasservorwärmungseinrichtung a Additional tapping line has, which is connected to the overload bypass line so that during partial load operation of the steam turbine can be removed from this process steam and the feedwater pre-heating 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 additional tapping line, so that live steam is fed between the steam turbine inlet of the steam turbine and the extraction point of the feedwater pre-heater; as soon as the steam turbine is driven below the nominal line, iso ¬ lieren the overload bypass line and releasing the additional extraction line, so that process steam is taken between the steam turbine inlet of the steam turbine and the extraction point and the feedwater preheating device is supplied to the additional feedwater preheating.
Somit ist die Überlastbypassleitung für den Betrieb der Thus, the overload bypass line for the operation of the
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. Ferner wird durch den Betrieb der Zusatzentnahmeleitung im Teillastbetrieb der Dampfturbine von der Dampfturbine Pro¬ zessdampf entnommen, der der Speisewasservorwärmungseinrich- tung zur zusätzlichen Speisewasservorwärmung im Teillastbe- trieb der Dampfturbine zugeführt wird, wodurch die Speisewas¬ sertemperatur 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 thermi¬ sche Wirkungsgrad der Dampfturbine hoch ist. Somit ist sowohl im Überlastbetrieb als auch im Teillastbetrieb der Dampftur- bine der thermische Wirkungsgrad hoch, so dass über einen weiten Leistungsbereich der Dampfturbine dessen thermischer Wirkungsgrad hoch ist. Steam turbine under overload and the additional extraction line for the operation of the steam turbine 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. Furthermore, whereby the Speisewas ¬ water temperature is raised the additional removal pipe is removed during partial load operation of the steam turbine of the steam turbine Pro ¬ zessdampf by the operation, which is the Speisewasservorwärmungseinrich- processing for additional feed water in the part-load operation of the steam turbine is supplied. 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 ¬ cal efficiency of the steam turbine is high. Thus, both in overload operation as well as in partial load operation of the steam turbine, the thermal efficiency is high, so that its thermal efficiency is high over a wide power range of the steam turbine.
Dadurch, dass die Zusatzentnahmeleitung an die Überlastby- passleitung 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 ein¬ zige 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 is the same point for feeding the live steam in case of overload as well as for removing the process steam Partial load case provided. Thus, the steam turbine to only a one ¬ Zige point where both the overload bypass line and the additional extraction line are grown. 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.
In vorteilhafter Weise wird die Dampfturbinenanlage mit einem Steuerungssystem ausgebildet. Mit dem Vorsehen der Überlastbypassleitung und der Zusatzentnahmeleitung ist vorteilhaft eine Vergleichmäßigung des Wirkungsgradverlaufs in Abhängigkeit der Leistung der Dampftur¬ bine erzielt. Dadurch sind Laständerungen der Dampfturbinen- anläge 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 (Ben- son-Mindestlast ) betreibbar ist. 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. Alterna- tiv bevorzugt ist im Betriebszustand der Dampfturbine unter¬ halb 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 Speisewas¬ sermenge am Speisewassereintritt des Dampferzeugers der Min¬ destbetriebspunkt der Dampfturbinenanlage hin zu tieferen Teillasten verschiebbar ist. Das Ansteigen der Speisewasser- temperatur kann vorteilhaft bis an die Grenze der thermischen und mechanischen Belastbarkeit des Dampferzeugers ausgereizt werden. Eventuell der Dampfturbinenanlage nachgeschaltete Rauchgasprozessschritte, wie beispielsweise eine DeNOx-Anla- ge, können infolge der angehobenen Speisewassertemperatur bei einer höheren Rauchgastemperatur betrieben werden. Advantageously, the steam turbine plant is formed with a control system. With the provision of the overload bypass line and the auxiliary extraction line an equalization of the efficiency profile as a function of the power of the Dampftur ¬ bine is advantageously achieved. As a result, load changes of the steam turbine systems can be moved faster at a constant and high level of thermal efficiency. 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 a low partial load level at which the steam turbine can still be operated under stable conditions in the steam turbine plant (Benson minimum load). 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. Alterna- tively preferred is the additional feedwater such that the feed water temperature increases in the operating condition of the steam turbine under ¬ half of the rated output at the feedwater inlet of the steam generator 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 with simultaneous increase of Speisewas ¬ sermenge at the feed water inlet of the steam generator Min ¬ destbetriebspunkt the steam turbine plant is displaced towards lower part loads. The rise in the feedwater temperature can advantageously be exploited to the limit of the thermal and mechanical load capacity of the steam generator. Any flue gas process steps downstream of the steam turbine plant, such as a DeNOx plant, can be operated at a higher flue gas temperature as a result of the raised feedwater 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 feedwater pre-heater preferably has a feedwater pre-heater that is different from that of the As a result, the process steam taken from the additional extraction line and the process steam removed from the extraction point are supplied to operate the feedwater pre-heater.
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 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. The fact that the additional preheater is provided in the steam turbine plant, the integration of Zusatzvorwärmers in the cycle of
Dampfturbinenanlage unabhängig von der Einbindung des Speise¬ wasservorwärmers vorgenommen sein, so dass hinsichtlich der Optimierung des thermischen Wirkungsgrads der Dampfturbinenanlage Freiheitsgrade vorteilhaft genutzt werden können. Steam turbine plant to be made independently of the integration of the feed ¬ water pre-heater, so that in terms of optimizing the thermal efficiency of the steam turbine plant degrees of freedom can be used to advantage.
Hierbei ist es bevorzugt, dass der Zusatzvorwärmer im Speise¬ wasserstrom stromab des Speisewasservorwärmers geschaltet ist. Somit ist der Zusatzvorwärmer vorteilhaft dem Speisewas¬ servorwärmer 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. Here, it is preferable that the Zusatzvorwärmer in the feed water stream ¬ is connected downstream of the feedwater preheater. Thus, the additional preheater is advantageously downstream of the feedwater ¬ servorwärmer. 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 Speisewasservorwärmungs- einrichtung 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 Op- timierung des thermischen Wirkungsgrads der Dampfturbinen- anlage in jedem Betriebszustand durch eine entsprechende Be¬ tätigung des Dreiwegeventils und einer entsprechenden Dimensionierung des Teilstroms des Speisewasserstroms durch den Zusatzvorwärmer optimiert werden. In addition, it is preferred that the feedwater preheating device has 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 op- Optimization of the thermal efficiency of the steam turbine plant in each operating state by a corresponding Be ¬ actuation of the three-way valve and a corresponding dimensioning of 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 Pro¬ zessdampfs in der Zusatzentnahmeleitung steuerbar ist. Außer- dem ist es bevorzugt, dass die Dampfturbine eine Hochdruck¬ dampfturbine ist. In the auxiliary sample line an additional sampling valve is preferably incorporated extent to which the mass flow of the Pro ¬ zessdampfs is controllable in the additional removal pipe. The outside, 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 sche- matischen Zeichnung erläutert. Es zeigt die Figur ein Wärme¬ schaltbild 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 heat ¬ circuit diagram of the embodiment of the steam turbine plant.
Wie es aus der Figur ersichtlich ist, weist eine Dampfturbi¬ nenanlage 1 einen Dampferzeuger 2 auf, der zur Erzeugung von Frischdampf in der Dampfturbinenanlage 1 vorgesehen ist. Die Dampfturbinenanlage 1 weist ferner eine Speisewasserzuführ- leitung 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 Zu- stand bereitgestellt ist. As is apparent from the figure, has a steam turbines ¬ nena position 1 to a steam generator 2 which is provided for the generation of steam in the steam turbine plant. 1 The steam turbine plant 1 also has a feedwater supply line 3, with which 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 de¬ ren Eintritt der Frischdampf via eine Frischdampfleitung 7 zum Antreiben der Dampfturbine 5 einströmbar ist. Der Massenstrom des Frischdampfs ist mit einem in der Frischdampflei¬ tung 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 de ¬ ren entry of live steam via a main steam line 7 for driving the steam turbine 5 can be flowed. The mass flow of the live steam is controllable with a built-in Frischdampflei ¬ device 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 Speisewasservor- wärmer 11 führt. Durch den Entnahmestutzen 9 ist von der Dampfturbine 5 Prozessdampf abzapfbar, der via die Entnahme¬ leitung 10 zu dem Speisewasservorwärmer 11 geführt wird. Der Speisewasservorwärmer 11 ist als ein Wärmetauscher ausge- führt, der in die Speisewasserzuführleitung 3 geschaltet ist, so dass unter Kondensieren des Prozessdampfs in dem Speise¬ wasservorwärmer 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 withdrawal line 10, which leads to a feedwater supply. warmer 11 leads. 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 heater 11 is designed as a heat exchanger leads connected to the Speisewasserzuführleitung 3, so that preheating of the feed water in the feed water preheater 11 is bewerkstelligbar ¬ under condensing the process steam. 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 Frischdampflei¬ tung 7 abzweigt und zu einem Überlastbypassstutzen 15 der Dampfturbine 5 führt, der zwischen dem Frischdampfeintritt und dem Entnahmestutzen 9 angeordnet ist. In der Überlastby¬ passleitung 14 ist ein Überlastbypassventil 16 vorgesehen, mit dem sowohl der durch die Überlastbypassleitung 14 strömende Frischdampfmassenstrom steuerbar als auch die Überlast- bypassleitung 14 isolierbar ist. The steam turbine 5 has an overload bypass line 14 which branches off upstream of the main steam valve 8 from the Frischdampflei ¬ device 7 and leads to a Überlastbypassstutzen 15 of the steam turbine 5, which is arranged between the live steam inlet and the sampling nozzle 9. In Überlastby ¬ pass line 14, an overload bypass valve 16 is provided, with which both the fresh steam mass flow flowing through the overload bypass line 14 controllable and the overload bypass line 14 can be isolated.
Stromab des Überlastbypassventils 16 mündet die Überlastby¬ passleitung 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 Zusatzentnahmelei¬ tung 17 isolierbar ist. 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 Speisewasservorwärmlei- tung 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. 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 ge¬ öffnet 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 un¬ terhalb der Nennleistung betrieben wird, wird das Überlast¬ bypassventil 16 geschlossen, so dass die Überlastbypasslei¬ tung 14 isoliert ist, und das Zusatzentnahmeventil 18 geöff¬ net, so dass die Zusatzentnahmeleitung 17 freigegeben ist. Dadurch wird von der Dampfturbine 5 stromauf des Entnahme¬ stutzens 9 Prozessdampf entnommen, der dem Zusatzvorwärmer 19 zugeführt wird. Durch eine entsprechende Stellung des Zusatz¬ entnahmeventils 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 ent¬ stehende Kondensat wird mit der Kondensatleitung 12 der Kondensatsammelleitung 13 zugeführt. In Abhängigkeit des Druckniveaus des Prozessdampfs am Ein¬ tritt 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. Downstream of the overload bypass valve 16 the Überlastby ¬ pass line 14 opens into an additional extraction line 17, which leads to a Zusatzvorwärmer 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 is controllable in its mass flow and with which the Zusatzentnahiemei ¬ device 17 is isolatable. 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 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 can be flowed through the additional preheater 19, can be regulated. 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. 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 operated above the rated power, the overload bypass valve 16 ge ¬ opens and the additional intake valve 18 is closed, whereby the overload bypass line 14 is released and the additional extraction line 17 is isolated. 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 un ¬ terhalb the nominal power is operated, the overload ¬ bypass valve 16 is closed so that the Überlastbypasslei ¬ tung is isolated 14, and the additional extraction valve 18 geöff ¬ net, so that the additional removal pipe is released 17th Characterized is taken from the steam turbine 5 upstream of the discharge nozzle 9 ¬ process steam which is supplied to the Zusatzvorwärmer 19th 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 ent ¬ standing condensate is supplied to the condensate line 12 of the condensate collecting line 13. Depending on the pressure level of the process steam at the entry 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 line 21 or the the resulting mixing of the feedwater in the downstream portion of the feedwater supply line 3, the three-way valve 20 is to operate accordingly.

Claims

Patentansprüche claims
1. Dampfturbinenanlage mit einer Dampfturbine (5), einem Dampferzeuger (2) und einer prozessdampfbetriebenen Speise- wasservorwärmungseinrichtung (9-13, 17-21), A steam turbine plant comprising a steam turbine (5), a steam generator (2) and a process steam-operated feedwater pre-heating device (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 Ent- nahmesteile (9) der Speisewasservorwärmungseinrichtung (9- wherein the steam turbine (5) has an overload bypass line (14) with which live steam is supplied between the steam turbine inlet and the removal parts (9) of the feedwater preheating device (9) during overload operation of the steam turbine (5).
13, 17-21) einspeisbar ist, 13, 17-21) can be fed,
dadurch gekennzeichnet, dass  characterized in that
die Speisewasservorwärmungseinrichtung (9-13, 17-21) eine Zusatzentnahmeleitung (17) aufweist, die an die Überlastby- passleitung (14) so angeschlossen ist, dass beim Teillastbetrieb der Dampfturbine (5) von dieser Prozessdampf ent¬ nehmbar und der Speisewasservorwärmungseinrichtung (9-13, 17-21) zur zusätzlichen Speisewasservorwärmung zufügbar ist . the Speisewasservorwärmungseinrichtung (9-13, 17-21) comprising an auxiliary extraction line (17), the matching circuit to the Überlastby- (14) is connected so that during part-load operation of the steam turbine (5) of this process steam ent ¬ Removable, the Speisewasservorwärmungseinrichtung (9 -13, 17-21) can be added for additional feed water preheating.
2. Dampfturbinenanlage gemäß Anspruch 1, 2. Steam turbine plant according to claim 1,
mit einem Steuerungssystem, das derart ausgebildet ist, dass die Dampfturbinenanlage nach einem Verfahren gemäß den Ansprüchen 9 bis 12 betreibbar ist.  with a control system which is designed such that the steam turbine plant can be operated by a method according to claims 9 to 12.
3. Dampfturbinenanlage gemäß Anspruch 1, 3. Steam turbine plant according to claim 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. 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).
4. Dampfturbinenanlage gemäß Anspruch 1, 4. Steam turbine plant according to claim 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.  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.
5. Dampfturbinenanlage gemäß Anspruch 3, 5. Steam turbine plant according to claim 3,
wobei der Zusatzvorwärmer (19) im Speisewasserstrom stromab des Speisewasservorwärmers (11) geschaltet ist.  wherein the additional preheater (19) is connected in the feedwater flow downstream of the feedwater preheater (11).
6. Dampfturbinenanlage gemäß Anspruch 3 oder 4, 6. Steam turbine plant according to claim 3 or 4,
wobei die Speisewasservorwärmungseinrichtung (9-13, 17-21) ein Dreiwegeventil (21) aufweist, mit dem der Zusatzvorwär¬ mer (19) in den Speisewasserstrom zuschaltbar und von dem Speisewasserstrom abschaltbar ist. wherein the feedwater preheating device (9-13, 17-21) has a three-way valve (21) with which the Zusatzvorwär ¬ mer (19) in the feedwater flow switchable and can be switched off from the feedwater flow.
7. Dampfturbinenanlage gemäß Anspruch 5, 7. Steam turbine plant according to claim 5,
wobei mit dem Dreiwegeventil (20) ein Teilstrom des Speise¬ wasserstroms durch den Zusatzvorwärmer (19) leitbar ist. wherein with the three-way valve (20) a partial flow of the feed ¬ water flow through the additional preheater (19) is conductive.
8. Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 6, wobei in der Zusatzentnahmeleitung (17) ein Zusatzentnahmeventil (18) eingebaut ist, mit dem der Massenstrom des Pro- zessdampfs in der Zusatzentnahmeleitung (17) steuerbar ist. 8. Steam turbine plant according to one of claims 1 to 6, wherein in the additional tapping line (17) an additional tapping valve (18) is installed, with which the mass flow of the process steam in the additional tapping line (17) is controllable.
9. Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 7, wobei die Dampfturbine (5) eine Hochdruckdampfturbine ist. 9. Steam turbine plant according to one of claims 1 to 7, wherein the steam turbine (5) is a high-pressure steam turbine.
10. Verfahren zum Betreiben einer Dampfturbinenanlage gemäß einem der Ansprüche 1 bis 8, mit den Schritten: 10. A method of operating a steam turbine plant according to one of claims 1 to 8, comprising the steps:
- Bestimmen des Wirkungsgradoptimums und der zugeordneten Nennleistung der Dampfturbine (5) ;  - Determining the optimum efficiency and the associated rated power of the steam turbine (5);
- sobald die Dampfturbine (5) oberhalb der Nennleistung be trieben wird, Freigeben der Überlastbypassleitung (14) und Isolieren der Zusatzentnahmeleitung (17), so dass Frischdampf zwischen dem Dampfturbineneintritt der Dampfturbine (5) und der Entnahmestelle (9) der Speisewasservorwärmungs einrichtung (9-13, 17-21) eingepeist wird;  - Once the steam turbine (5) is operated above the rated power be, releasing the overload bypass line (14) and isolating the additional tapping line (17), so that live steam between the steam turbine inlet of the steam turbine (5) and the removal point (9) of the feedwater pre-heating device (9 -13, 17-21) is fed;
- 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.  - As soon as the steam turbine (5) is operated below the rated power, isolating the overload bypass line (14) and releasing the additional extraction 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.
11. Verfahren gemäß Anspruch 9, 11. The method according to claim 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.  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.
12. Verfahren gemäß Anspruch 9, 12. The method according to claim 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. 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).
13. Verfahren gemäß Anspruch 11, 13. The method according to claim 11,
wobei die Erhöhung der Speisewassertemperatur am Speisewassereintritt des Dampferzeugers (2) bei gleichzeitiger Erhö¬ hung der Speisewassermenge am Speisewassereintritt des Dampferzeugers (2) der Mindestbetriebspunkt der Dampfturbi¬ nenanlage (1) hin zu tieferen Teillasten verschiebbar ist. wherein the increase of the feedwater temperature at the feed water inlet of the steam generator (2) with simultaneous increase ¬ increase of the feedwater quantity at the feed water inlet of the steam generator (2) of the minimum operating point of the steam turbine ¬ nenanlage (1) towards lower part loads is displaceable.
EP20120729473 2011-07-14 2012-06-14 Steam turbine installation and method for operating the steam turbine installation Not-in-force EP2705225B1 (en)

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CN103649474A (en) 2014-03-19
JP5990581B2 (en) 2016-09-14
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US9322298B2 (en) 2016-04-26
JP2014522940A (en) 2014-09-08

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