EP2496796A2 - Fossil-fueled power station comprising a carbon dioxide separation device and method for operating a fossil-fueled power station - Google Patents

Fossil-fueled power station comprising a carbon dioxide separation device and method for operating a fossil-fueled power station

Info

Publication number
EP2496796A2
EP2496796A2 EP10775787A EP10775787A EP2496796A2 EP 2496796 A2 EP2496796 A2 EP 2496796A2 EP 10775787 A EP10775787 A EP 10775787A EP 10775787 A EP10775787 A EP 10775787A EP 2496796 A2 EP2496796 A2 EP 2496796A2
Authority
EP
European Patent Office
Prior art keywords
steam
carbon dioxide
fossil
separation device
power plant
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.)
Withdrawn
Application number
EP10775787A
Other languages
German (de)
French (fr)
Inventor
Ulrich Grumann
Jens Keyser
Ulrich Much
Andreas Pickard
Mike Rost
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
Publication of EP2496796A2 publication Critical patent/EP2496796A2/en
Withdrawn legal-status Critical Current

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
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • 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
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/12—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engines being mechanically coupled
    • F01K23/14—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engines being mechanically coupled including at least one combustion engine
    • 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
    • F01K7/16—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 only of turbine type
    • F01K7/22—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 only of turbine type the turbines having inter-stage steam heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/32—Direct CO2 mitigation

Definitions

  • the object of the invention is therefore to specify a device and a method in a fossil-fired power plant, low-pressure steam from a source other than the
  • the object of the invention directed to a device is solved by the features of claim 1.
  • the invention is based on a steam turbine, which has a kom despreusige middle and low pressure stage.
  • steam turbine also still includes a high-pressure stage in a separate case.
  • the live steam for the high-pressure stage after leaving the high-pressure stage, is returned to the boiler for reheating (reheating) via a vapor return line (cold reheat line).
  • a process steam line which is connected to the carbon dioxide separation device, is connected to the vapor recirculation line, wherein a counterpressure steam turbine is connected in the process steam line. Due to the back pressure steam turbine, the extracted process steam is at the process steam condition (saturated steam) brought.
  • the boiler must be designed accordingly ⁇ .
  • the extracted process steam is converted into electrical energy by a generator connected to the counterpressure steam turbine. Characterized the überschüssi ge ⁇ energy of the process steam for electric power generation is available.
  • the carbon dioxide separation process consists of an absorption unit and a desorption unit.
  • the process steam line is connected to a heat exchanger desorption unit feeding.
  • the desorption unit is connected to a condensate return line.
  • the process steam is removed from the vapor return line in the method according to the invention.
  • the process steam is thereby released in a relaxation process, whereby a relaxed steam (saturated steam) is formed.
  • the expanded vapor is then fed to the carbon dioxide separation device.
  • the relaxation process is used to generate electrical energy.
  • the expanded steam is then ⁇ preferably used in order to heat the desorption of the carbon dioxide deposition process.
  • the preparation measures for "Capture Ready" are limited by the invention to a corresponding Kesselausle ⁇ tion and a connection point outside the plant-critical machine house .
  • the steam turbine can retrofit a carbon dioxide separation device thermodynamically on the then used for the separation process. Connecting the backpressure turbine before reheating results in lower steam temperatures, which can be easily relieved by standard industrial turbines.
  • the fossil fuel-fired power plant 1 shows essentially a fossil-fired power plant ⁇ system 1 with a device connected to a carbon dioxide separating heat exchanger 21.
  • the fossil fuel-fired power plant 1 is here as a gas and steam power station
  • GUID designed.
  • the gas and steam turbine plant is ver ⁇ simplified shown and consists essentially of a gas turbine 13, a steam turbine 2, a generator 20 and a switched into the exhaust duct of the gas turbine steam generator 4, designed as a heat recovery steam generator 15th Die
  • Steam turbine 2 comprises a high pressure stage 24 and a medium- and low-pressure stage 25.
  • the gas turbine 13, the genes ⁇ rator 20 and the steam turbine 2 are located on a ge ⁇ common shaft 8.
  • the high-pressure stage 24 is connected to the steam generator 4 by supplying fresh steam via a main steam line 23 and steam-returning via a cold intermediate superheat line 16.
  • a process steam line 6 is connected to the tapping of a process steam 17.
  • the middle and low pressure stage 25 is connected to the steam generator 4 via a hot intermediate superheat conduit 31.
  • the extracted steam from the cold intermediate superheat line has a temperature of approx. 160 ° C.
  • a back-pressure steam turbine 7 is provided, which is connected to the process steam supply line 6 connected to the process steam.
  • the backpressure steam turbine 7 fin ⁇ det a relaxation of the process steam 17 to a saturated steam 26 instead.
  • the process steam 17 is thereby converted by a connected to the back pressure steam turbine 7 generator 9 into electrical energy.
  • the back pressure steam turbine 7 is connected to a heat exchanger 21 of a carbon dioxide separation device.
  • the carbon dioxide separation device is not shown here in detail.
  • the counterpressure steam turbine 7 is connected to the desorption unit 11 of the carbon dioxide separation device via a saturated steam line 28.
  • the saturated steam 26 in desorption unit 11 assists the boiling out of a solvent for the release of carbon dioxide.
  • a condensate is discharged into the condenser 22 via a condensate return line 29.
  • the condensate return line 29 is connected to the capacitor 22 accordingly.
  • a Kondensatlei ⁇ tung 30 is provided which connects the condenser 22 to the steam generator 4 to the feed water circuit to close ⁇ SEN.

Abstract

The invention relates to a fossil-fueled power station (1) comprising a steam turbine (2), a steam generator (4) mounted downstream of the steam turbine (2) via a steam return line (3) and a carbon dioxide separation device (5). According to the invention, the carbon dioxide separation device (5) is connected to the steam return line (3) via a process steam line (6), a backpressure steam turbine (7) being mounted into the process steam line (6).

Description

Beschreibung description
Fossil befeuerte Kraftwerksanlage mit einer Kohlendioxid- Abscheidevorrichtung sowie Verfahren zum Betrieb einer fossil befeuerten Kraftwerksanlage Fossil fueled power plant with a carbon dioxide capture device and process to operate a fossil fueled power plant
Für die Abscheidung von Kohlendioxid aus Abgasen von fossil befeuerten Kraftwerksanlagen, wie beispielsweise Gas- und Dampfkraftwerksanlagen (GUD) oder Kohle befeuerten Dampf- kraftanlagen (DKW) , ist eine große Menge an Energie erforder¬ lich. For the capture of carbon dioxide emissions from fossil-fueled power plants, such as combined cycle power plants (GUD) or coal-fired steam turbines (DKW), a large amount of energy is erforder ¬ Lich.
Bei Einsatz eines nasschemischen Absorbtions- Desorptionsver- fahren zur Abscheidung von Kohlendioxid muss diese Energie in Form von thermischer Energie zur Beheizung des Desorpti- onsprozesses aufgebracht werden. Üblicherweise wird dazu Nie¬ derdruckdampf aus dem Wasserdampfkreislauf der Kraftwerksanlage verwendet. Selbst wenn eine im Bau befindliche Kraftwerksanlage noch nicht mit einem an ihr angeschlossenen Kohlendioxid- Abscheidevorrichtung ausgestattet wird, besteht schon heute die Nachweispflicht der späteren Nachrüstbarkeit (Capture Readyness) . Dementsprechend werden bereits heute entsprechen- de Vorkehrungen getroffen, sodass eine Kohlendioxid- Abscheidevorrichtung zu einem späteren Zeitpunkt problemlos in die Kraftwerksanlage integriert werden kann. Betroffen von derartigen Vorkehrungen sind beispielsweise das Maschinenhaus, welches durch die Entnahme des Niederdruckdampfes ent- sprechend vergrößert werden muss. When using a wet-chemical absorption-desorption method for separating carbon dioxide, this energy must be applied in the form of thermal energy for heating the desorption process. Typically never ¬ derdruckdampf is used from the water steam cycle of the power plant. Even if a power plant under construction is not yet equipped with a carbon dioxide separation device connected to it, there is already a duty to prove the later retrofittability (capture readyness). Accordingly, appropriate precautions are already taken today so that a carbon dioxide separation device can be easily integrated into the power plant at a later date. Affected by such precautions are, for example, the nacelle, which must be increased by the removal of the low-pressure steam accordingly.
Zudem besteht die Erfordernis, dass die Dampfturbine bzw. der Kraftwerksprozess für die Entnahme von Niederdruckdampf ent¬ sprechen konfiguriert sein muss. Bei Dampfturbinen mit ge- trenntem Gehäuse für die Mittel- und Niederdruckstufe ist die Entnahme von Niederdruckdampf an der Überströmleitung auf einfache weise möglich. Hingegen bei Dampfturbinen mit einer eingehäusigen Mittel- und Niederdruckstufe ist die Entnahme der erforderlichen großen Dampfmenge aus der Turbine bei ge¬ eignetem Druck nicht möglich. There is also the requirement that the steam turbine or the power plant process for the removal of low pressure steam to speak ent ¬ must be configured. For steam turbines with a separate housing for the medium and low pressure stages, the extraction of low pressure steam at the overflow line is easily possible. On the other hand with steam turbines with a moderate medium and low pressure stage is the removal the required large amount of steam from the turbine at ge ¬ suitable pressure not possible.
Die Entnahme von Dampf aus anderen Quellen innerhalb des Kraftwerksprozesses ist oft nicht wirtschaftlich, oder auf geeignete Weise möglich. So führt beispielsweise eine Entnah¬ me aus einer Zwischenüberhitzungsleitung der Dampfturbine zur Schieflast des Kessels. Auch die Entnahme von höherwertigem Dampf für die Kohlendioxid-Abscheidevorrichtung muss ausge- schlössen werden, da dies zu unvertretbarem Energieverlusten führt . The removal of steam from other sources within the power plant process is often not economical or suitably possible. So a Entnah ¬ me of a reheat line of the steam turbine, for example, leads to unbalanced load of the boiler. Also, the removal of higher-grade steam for the carbon dioxide separation device must be ruled out, as this leads to unjustifiable energy losses.
Aufgabe der Erfindung ist es daher, eine Vorrichtung und ein Verfahren bei einer fossil befeuerte Kraftwerksanlage an- zugeben, Niederdruckdampf aus einer anderen Quelle als derThe object of the invention is therefore to specify a device and a method in a fossil-fired power plant, low-pressure steam from a source other than the
Überstömleitung zwischen Mittel- und Niederdurckstufe für ei¬ ne Kohlendioxid-Abscheidevorrichtung bereitzustellen, sodass eine Schieflast des Kraftwerksprozesses vermieden wird, und die Energieverluste durch die Dampfentnähme weitgehend mini- miert werden. Überstömleitung provide between middle and Niederdurckstufe for ei ¬ ne carbon dioxide separation device, so that a load unbalance of the power plant process is avoided, and the energy losses are minimized by the Dampfentnähme largely.
Gelöst wird die auf eine Vorrichtung gerichtete Aufgabe der Erfindung durch die Merkmale des Anspruchs 1. Die Erfindung geht dabei von einer Dampfturbine aus, die eine eingehäusige Mittel- und Niederdruckstufe hat. Neben der Mit¬ tel- und Niederdruckstufe umfasst die Dampfturbine zudem noch eine Hochdruckstufe in einem separaten Gehäuse. Dabei ist vorgesehen, dass der Frischdampf für die Hochdruckstufe nach Austritt aus der Hochdruckstufe über eine Dampfrückführlei- tung (kalte Zwischenüberhitzungs-Leitung) in den Kessel zur Wiedererwärmung ( Zwischenüberhitzung) zurück geführt wird. Erfindungsgemäß ist nun vorgesehen, dass an die Dampfrück- führleitung eine Prozessdampfleitung angeschlossen ist, die mit der Kohlendioxid-Abscheidevorrichtung verbunden ist, wobei in die Prozessdampfleitung eine Gegendruckdampfturbine geschaltet ist. Durch die Gegendruckdampfturbine wird der entnommene Prozessdampf auf Prozessdampfzustand (Sattdampf) gebracht. Für eine Entnahme des Dampfes muss der Kessel ent¬ sprechend ausgelegt sein. The object of the invention directed to a device is solved by the features of claim 1. The invention is based on a steam turbine, which has a kommäusige middle and low pressure stage. In addition to the ¬ With medium and low-pressure stage steam turbine also still includes a high-pressure stage in a separate case. It is envisaged that the live steam for the high-pressure stage, after leaving the high-pressure stage, is returned to the boiler for reheating (reheating) via a vapor return line (cold reheat line). According to the invention, it is now provided that a process steam line, which is connected to the carbon dioxide separation device, is connected to the vapor recirculation line, wherein a counterpressure steam turbine is connected in the process steam line. Due to the back pressure steam turbine, the extracted process steam is at the process steam condition (saturated steam) brought. For a removal of the steam, the boiler must be designed accordingly ¬ .
In einer vorteilhaften Weiterbildung der fossil befeuerten Kraftwerksanlage wird der entnommene Prozessdampf durch einen an der Gegendruckdampfturbine angeschlossenen Generator in elektrische Energie umgewandelt. Dadurch ist die überschüssi¬ ge Energie des Prozessdampfes zur Erzeugung elektrischer Energie nutzbar. In an advantageous development of the fossil-fired power plant, the extracted process steam is converted into electrical energy by a generator connected to the counterpressure steam turbine. Characterized the überschüssi ge ¬ energy of the process steam for electric power generation is available.
In einer zweckmäßigen Ausgestaltung der fossil befeuerten Kraftwerksanlage besteht der Kohlendioxid-Abscheideprozess aus einer Absorptionseinheit und einer Desorptionseinheit . Die Prozessdampfleitung ist dabei zuführend mit einem Wärme- tauscher der Desorptionseinheit verbunden. Ausleitend ist die Desorptionseinheit mit einer Kondensatrückführleitung verbunden . In an expedient embodiment of the fossil-fired power plant, the carbon dioxide separation process consists of an absorption unit and a desorption unit. The process steam line is connected to a heat exchanger desorption unit feeding. As a result, the desorption unit is connected to a condensate return line.
Die auf ein Verfahren gerichtete Aufgabe der Erfindung wird gelöst durch die Merkmale des Anspruchs 5. The object of the invention directed to a method is solved by the features of claim 5.
Analog zur Vorrichtung wird bei dem erfindungsgemäßen Verfahren der Prozessdampf aus der Dampfrückführleitung entnommen. Der Prozessdampf wird dabei in einem Entspannungsprozess ent- spannt wobei ein entspannter Dampf (Sattdampf) gebildet wird. Der entspannte Dampf wird dann der Kohlendioxid- Abscheidevorrichtung zugeführt. Analogous to the device, the process steam is removed from the vapor return line in the method according to the invention. The process steam is thereby released in a relaxation process, whereby a relaxed steam (saturated steam) is formed. The expanded vapor is then fed to the carbon dioxide separation device.
Vorteilhafterweise wird der Entspannungsprozess zur Erzeugung elektrischer Energie verwendet. Der entspannte Dampf wird da¬ bei vorzugsweise zur Beheizung des Desorptionsprozesses des Kohlendioxid-Abscheideprozess verwendet . Advantageously, the relaxation process is used to generate electrical energy. The expanded steam is then ¬ preferably used in order to heat the desorption of the carbon dioxide deposition process.
Die Vorbereitungsmaßnahmen für „Capture Ready" beschränken sich durch die Erfindung auf eine entsprechende Kesselausle¬ gung und einen Anschlusspunkt außerhalb des anlagekritischen Maschinenhauses. Die Dampfturbine kann bei Nachrüstung einer Kohlendioxid-Abscheidevorrichtung thermodynamisch auf den dann genutzten Abscheideprozess optimiert werden. Der An- schluss der Gegendruckturbine vor der Zwischenüberhitzung führt zu geringeren Dampftemperaturen, die von Standard Industrieturbinen problemlos entspannt werden können. The preparation measures for "Capture Ready" are limited by the invention to a corresponding Kesselausle ¬ tion and a connection point outside the plant-critical machine house .. The steam turbine can retrofit a carbon dioxide separation device thermodynamically on the then used for the separation process. Connecting the backpressure turbine before reheating results in lower steam temperatures, which can be easily relieved by standard industrial turbines.
Nachfolgend wird die Erfindung anhand einer Zeichnung näher erläutert: Darin zeigt The invention is explained in more detail with reference to a drawing: Darin shows
FIG 1 Eine fossil befeuerte Kraftwerksanlage mit einer 1 shows a fossil-fired power plant with a
Kohlendioxid-AbscheideVorrichtung  Carbon dioxide separator
FIG 1 zeigt im Wesentlichen eine fossil befeuerte Kraftwerks¬ anlage 1 mit einem an eine Kohlendioxid-Abscheidevorrichtung angeschlossenen Wärmetauscher 21. Die fossil befeuerte Kraft- Werksanlage 1 ist hier als Gas- und Dampfkraftwerksanlage1 shows essentially a fossil-fired power plant ¬ system 1 with a device connected to a carbon dioxide separating heat exchanger 21. The fossil fuel-fired power plant 1 is here as a gas and steam power station
(GUD) ausgestaltet. Die Gas- und Dampfturbinenanlage ist ver¬ einfacht dargestellt und besteht im wesentlichen aus einer Gasturbine 13, einer Dampfturbine 2, einem Generator 20 und einem in den Abgaskanal der Gasturbine geschalteten Dampfer- zeuger 4, ausgestaltet als Abhitzedampferzeuger 15. Die (GUD) designed. The gas and steam turbine plant is ver ¬ simplified shown and consists essentially of a gas turbine 13, a steam turbine 2, a generator 20 and a switched into the exhaust duct of the gas turbine steam generator 4, designed as a heat recovery steam generator 15th Die
Dampfturbine 2 besteht aus einer Hochdruckstufe 24 und einer Mittel- und Niederdruckstufe 25. Die Gasturbine 13, der Gene¬ rator 20 und die Dampfturbine 2 befinden sich auf einer ge¬ meinsamen Welle 8. Der Dampfturbine 2 ist ein Kondensator 22 nachgeschaltet. Steam turbine 2 comprises a high pressure stage 24 and a medium- and low-pressure stage 25. The gas turbine 13, the genes ¬ rator 20 and the steam turbine 2 are located on a ge ¬ common shaft 8. The steam turbine 2, a condenser 22 downstream of it.
Die Hochdruckstufe 24 ist mit dem Dampferzeuger 4 frischdampfzuführend über eine Frischdampfleitung 23 und dampfrück- führend über eine kalte Zwischenüberhitzungsleitung 16 ver- bunden. An der kalten Zwischenüberhitzungsleitung 16 ist zur Anzapfung eines Prozessdampfes 17 eine Prozessdampfleitung 6 angeschlossen. Die Mittel- und Niederdruckstufe 25 ist über eine heiße Zwischenüberhitzungsleitung 31 mit dem Dampferzeuger 4 verbunden. Der entnommene Dampf aus der kalten Zwi- schenüberhitzungsleitung weist dabei ein Temperatur von ca. 160°C auf. Neben der Dampfturbine 2 ist eine Gegendruckdampfturbine 7 vorgesehen, die prozessdampfzuführend mit der Prozessdampf¬ leitung 6 verbunden ist. In der Gegendruckdampfturbine 7 fin¬ det eine Entspannung des Prozessdampfes 17 zu einem Sattdampf 26 statt. Der Prozessdampf 17 wird dabei durch einen an die Gegendruckdampfturbine 7 angeschlossenen Generator 9 in elektrische Energie umgewandelt. The high-pressure stage 24 is connected to the steam generator 4 by supplying fresh steam via a main steam line 23 and steam-returning via a cold intermediate superheat line 16. At the cold reheat line 16, a process steam line 6 is connected to the tapping of a process steam 17. The middle and low pressure stage 25 is connected to the steam generator 4 via a hot intermediate superheat conduit 31. The extracted steam from the cold intermediate superheat line has a temperature of approx. 160 ° C. In addition to the steam turbine 2, a back-pressure steam turbine 7 is provided, which is connected to the process steam supply line 6 connected to the process steam. In the backpressure steam turbine 7 fin ¬ det a relaxation of the process steam 17 to a saturated steam 26 instead. The process steam 17 is thereby converted by a connected to the back pressure steam turbine 7 generator 9 into electrical energy.
Der Gegendruckdampfturbine 7 ist ein Wärmetauscher 21 einer Kohlendioxid-Abscheidevorrichtung geschaltet. Die Kohlendioxid-Abscheidevorrichtung ist dabei hier nicht näher dargestellt. Verbunden ist die Gegendruckdampfturbine 7 mit der Desorptionseinheit 11 der Kohlendioxid-Abscheidevorrichtung über eine Sattdampfleitung 28. Der Sattdampf 26 unterstützt in Desorptionseinheit 11 das auskochen eines Lösungsmittels zur Widerfreisetzung von Kohlendioxid. The back pressure steam turbine 7 is connected to a heat exchanger 21 of a carbon dioxide separation device. The carbon dioxide separation device is not shown here in detail. The counterpressure steam turbine 7 is connected to the desorption unit 11 of the carbon dioxide separation device via a saturated steam line 28. The saturated steam 26 in desorption unit 11 assists the boiling out of a solvent for the release of carbon dioxide.
Aus dem Wärmetauscher 21 wird über eine Kondensatrückführlei¬ tung 29 ein Kondensat in den Kondensator 22 ausgeleitet. Dazu ist die Kondensatrückführleitung 29 mit dem Kondensator 22 entsprechend verbunden. Schlussendlich ist eine Kondensatlei¬ tung 30 vorgesehen, die den Kondensator 22 mit dem Dampferzeuger 4 verbindet, um den Speisewasserkreislauf zu schlie¬ ßen . From the heat exchanger 21, a condensate is discharged into the condenser 22 via a condensate return line 29. For this purpose, the condensate return line 29 is connected to the capacitor 22 accordingly. Finally, a Kondensatlei ¬ tung 30 is provided which connects the condenser 22 to the steam generator 4 to the feed water circuit to close ¬ SEN.

Claims

Patentansprüche claims
1. Fossil befeuerte Kraftwerksanlage (1) umfassend eine 1. Fossil-fired power plant (1) comprising a
Dampfturbine (2), einem der Dampfturbine (2) über eine Dampf- rückführleitung (3) nach geschalteten Dampferzeuger (4) und eine Kohlendioxid-Abscheidevorrichtung (5) , Steam turbine (2), one of the steam turbine (2) via a steam return line (3) downstream of the steam generator (4) and a carbon dioxide separation device (5),
dadurch gekennzeichnet, dass die Kohlendioxid- Abscheidevorrichtung (5) über eine Prozessdampfleitung (6) mit der Dampfrückführleitung (3) verbunden ist, und dass in die Prozessdampfleitung (6) eine Gegendruckdampfturbine (7) geschaltet ist. characterized in that the carbon dioxide separation device (5) via a process steam line (6) with the vapor return line (3) is connected, and in that the process steam line (6), a back pressure steam turbine (7) is connected.
2. Fossil befeuerte Kraftwerksanlage (1) nach Anspruch 1, da¬ durch gekennzeichnet, dass die Gegendruckdampfturbine (7) über eine Welle (8) mit einem Generator (9) zur Stromerzeu¬ gung verbunden ist. 2. Fossil fueled power plant (1) according to claim 1, since ¬ characterized in that the counter-pressure steam turbine (7) via a shaft (8) with a generator (9) for Stromerzeu ¬ supply is connected.
3. Fossil befeuerte Kraftwerksanlage (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kohlendioxid- Abscheidevorrichtung (5) eine Absorptionseinheit (10) und ei¬ ne Desorptionseinheit (11) umfasst. 3. Fossil fueled power plant (1) according to claim 1 or 2, characterized in that the carbon dioxide separation device (5) comprises an absorption unit (10) and ei ¬ ne desorption unit (11).
4. Fossil befeuerte Kraftwerksanlage (1) nach einem der An¬ sprüche 1 bis 3, gekennzeichnet durch eine Ausgestaltung als Gas- und Dampfturbinenkraftwerk (12), umfassend eine Gasturbine (13), wobei der Dampferzeuger (4) ein Abhitzedampferzeu¬ ger (15) ist, und die Dampfrückführleitung (3) eine kalte Zwischenüberhitzungsleitung (16) ist. 4. Fossil fueled power plant (1) according to one of claims ¬ 1 to 3, characterized by a configuration as a gas and steam turbine power plant (12), comprising a gas turbine (13), wherein the steam generator (4) a Abhitzedampferzeu ¬ ger (15 ), and the vapor return line (3) is a cold reheat line (16).
5. Verfahren zum Betrieb einer fossil befeuerte Kraftwerksanlage (1), mit einem einer Dampfturbine (2) über eine Dampf- rückführleitung (3) nachgeschalteten Dampferzeuger (4) und einer Kohlendioxid-Abscheidevorrichtung (5) , bei dem 5. A method for operating a fossil-fired power plant (1), with a steam turbine (2) via a steam return line (3) downstream steam generator (4) and a carbon dioxide separation device (5), in which
Prozessdampf (17) aus der Dampfrückführleitung (3) entnommen wird, der Prozessdampf (17) in einem Entspannungsprozess (18) entspannt wird, wobei ein entspannter Dampf (19) gebildet wird, und der entspannte Dampf (19) der Kohlendioxid- Abscheidevorrichtung (5) zugeführt wird. Process steam (17) is removed from the vapor return line (3), the process steam (17) is expanded in a relaxation process (18), wherein a relaxed steam (19) is formed, and the expanded steam (19) of the carbon dioxide precipitation device (5 ) is supplied.
6. Verfahren nach Anspruch 5, bei dem der Entspannungsprozess (18) weiterhin einen Generator (20) umfasst, und zur Erzeugung elektrischer Energie verwendet wird. The method of claim 5, wherein the relaxation process (18) further comprises a generator (20) and used to generate electrical energy.
7. Verfahren nach Anspruch 5 oder 6, bei dem der entspannte Dampf (19) zur Desorption von Kohlendioxid verwendet wird. 7. The method of claim 5 or 6, wherein the expanded steam (19) is used for the desorption of carbon dioxide.
EP10775787A 2009-11-02 2010-10-29 Fossil-fueled power station comprising a carbon dioxide separation device and method for operating a fossil-fueled power station Withdrawn EP2496796A2 (en)

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