EP0180093B1 - Thermal power plant - Google Patents

Thermal power plant Download PDF

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Publication number
EP0180093B1
EP0180093B1 EP85113145A EP85113145A EP0180093B1 EP 0180093 B1 EP0180093 B1 EP 0180093B1 EP 85113145 A EP85113145 A EP 85113145A EP 85113145 A EP85113145 A EP 85113145A EP 0180093 B1 EP0180093 B1 EP 0180093B1
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EP
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Prior art keywords
feed water
line
exhaust gas
condensate
heat exchanger
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Expired
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EP85113145A
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German (de)
French (fr)
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EP0180093A1 (en
Inventor
Hermann Brückner
Winfried Dipl.-Ing. Ganzer
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Siemens AG
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Siemens AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • 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
    • F01K23/106—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 with water evaporated or preheated at different pressures in exhaust boiler
    • F01K23/108—Regulating means specially adapted therefor

Definitions

  • the invention relates to a thermal power plant with a gas turbine, a device for heat recovery connected downstream of the gas turbine on the exhaust gas side, an energy converter associated with the device for heat recovery with an associated capacitor and this connected via a condensate line feed water tank for the device for heat recovery, and with a device downstream of the device for heat recovery on the exhaust gas side Exhaust gas heat exchanger, which is connected to the feed water tank via a feed water feed line and a feed water return line to form a closed feed water circuit.
  • the invention has for its object to improve the overall efficiency of a thermal power plant of the type mentioned.
  • the inlet temperature of the feed water into the exhaust gas heat exchanger can be reduced, so that more exhaust gas heat can be transferred to the feed water circuit and the supply of, for example, water vapor to the energy converter in the feed water tank can be dispensed with.
  • the specified setpoint, to which the feed water inlet temperature is regulated with the help of the control valve in the feed water supply line, can be selected higher than the dew point of H 2 0 or also of acids in the exhaust gas, so that corrosion on the heat transfer surfaces of the exhaust gas heat exchanger is avoided.
  • thermal power plant according to the invention can achieve that when the gas turbine changes load and the associated changes in the exhaust gas temperature, the setpoint value of the feed water temperature in the feed water return line is kept within the range between the predetermined maximum value and the predetermined minimum value.
  • the drawing shows the basic circuit diagram of a combined gas-steam thermal power plant with a gas turbine 2 and a steam turbine 3 with a high-pressure part and a low-pressure part.
  • the drive shaft of a compressor 4 for combustion air and an electric generator 5 is coupled to the output shaft of the gas turbine 2. Furthermore, a combustion chamber 8 is provided, to which the exhaust port of the compressor 4 and the feed port of the gas turbine 2 for combustion gas are connected. The drive shaft of an electric generator 6 is coupled to the output shaft of the steam turbine 3.
  • a waste heat steam generator 7 is connected to the discharge port of the gas turbine 2 for exhaust gas, with a high-pressure steam superheater 11 connected directly to the discharge port of the gas turbine 2 for exhaust gas, and to the high-pressure evaporator 13, high-pressure economizer 15, low-pressure steam superheater 17, low-pressure evaporator 9 and low-pressure economizer connected in series in the exhaust gas stream 12th
  • the heat recovery steam generator 7 also includes a high-pressure steam drum 22 and a low-pressure steam drum 28.
  • the feed water outlet of the high-pressure economizer 15 and the outlet of the high-pressure evaporator 13 are connected to the high-pressure steam drum 22.
  • the feed water outlet of the high pressure steam drum 22 is connected to the inlet of the high pressure evaporator 13 via a circulation pump 24.
  • the steam outlet of the high pressure steam drum 22 is connected to the steam inlet of the high pressure steam superheater 11.
  • the outlet of the low-pressure economizer 12 and the outlet of the low-pressure evaporator 9 are connected to the low-pressure steam drum 28.
  • the feed water outlet of the low-pressure steam drum 28 is connected both via a feed water pump 26 at the feed water inlet of the high-pressure economizer 15 and via a further circulation pump 10 at the inlet of the low-pressure evaporator 9.
  • the steam outlet of the low-pressure steam drum 28 is connected to the steam inlet of the low-pressure steam superheater 17.
  • the live steam outlet of the high pressure steam superheater 11 is connected to the steam inlet of the high pressure part of the steam turbine 3 and the live steam outlet of the low pressure steam superheater 17 is connected to the steam inlet of the low pressure part of the steam turbine 3.
  • a feed water line 32 having a feed water pump 31 leads from a feed water container 30 to the feed water inlet of the low-pressure economizer 12.
  • a condenser 34 which has a hotwell 35 on the condensate outlet side, is connected downstream of the evaporation nozzle of the steam turbine 3 via an exhaust steam line 33.
  • This hotwell 35 is connected to the feed water tank 30 via a condensate line 37 having a condensate pump 36 with a downstream control valve 43.
  • An exhaust gas heat exchanger 14 is connected on the gas side downstream of the low-pressure economizer 12 and is connected on its water side to the feed water tank 30 via a feed water return line 39.
  • a feed water supply line 38 with a control valve 40 and upstream circulation pump 41 also leads from the feed water tank 30 to the water side of the exhaust gas heat exchanger 14.
  • a bypass line 42 for condensate leads from a connection point on the condensate line 37 between the condensate pump 36 and the control valve 43 to a connection point on the feed water supply line 38 between the control valve 40 and the feed water inlet of the exhaust gas heat exchanger 14.
  • the control valve 43 has a regulator 45 with a pressure sensor in the feed water tank 30 and the control valve 40 a controller 46, each with a temperature sensor in the feed water return line 39 and in the feed water return line 38 between the feed water inlet into the exhaust gas heat exchanger 14 and the connection point of the bypass line 42.
  • Condensate flows out of the hotwell 35 via the condensate line 37, the bypass line 42 and the feed water supply line 38 through the exhaust gas heat exchanger 14 via the feed water return line 39 into the feed water tank 30 , warmer feed water from the feed water tank 30 mixed, so that the entry temperature of the condensate into the exhaust gas heat exchanger 14 assumes such a setpoint value, for example 70 ° C., at which the dew point temperature of the H 2 0 and lower SO 2 components in the exhaust gas on the exhaust gas side of the exhaust gas heat exchanger 14 is not undercut and therefore corrosion on the heat transfer surfaces of the exhaust gas heat exchanger 14 is avoided.
  • a setpoint value for example 70 ° C.
  • the pressure in the feed water tank 30 is set to a predetermined setpoint, e.g. 1.2 bar, regulated with the aid of the control valve 43, with which cold condensate from the condensate line 37 is fed directly into the feed water tank 30.
  • the outlet temperature of the condensate from the exhaust gas heat exchanger 14 in the feed water return line 39 e.g. changes in the load of the gas turbine 2 or the steam turbine 3 exceed a predetermined maximum value or fall below a predetermined minimum value
  • the regulation of the inlet temperature of the condensate in the exhaust gas heat exchanger 14 is replaced and the feed water throughput fed into the feed water supply line 38 via the control valve 40 is set such that the outlet temperature of the Feed water from the exhaust gas heat exchanger 14 a predetermined setpoint, for example 110 ° C, and the regulation of the pressure in the feed water tank 30 to the predetermined target value via the control valve 43 remains effective.

Abstract

1. Thermal power plant having a gas turbine (2), a heat recovery device (11, 13, 15, 17, 9, 12) connected to the gas turbine on its exhaust gas side, an energy transducer (3) associated with the heat recovery device, with associated condenser (34) and feed water container (30) for the heat recovery device, connected to the condenser on the outlet side by means of a condensate line (37), and also having an exhaust gas heat exchanger (14) connected to the heat recovery device on its exhaust gas side, which exchanger is connected to the feed water container (30) by means of a feed water supply line (38) and a feed water return line (39) forming a closed feed water circuit, characterized in that there is provided a bypass line (42) for condensate going from the condensate line (37) to the feed water inlet of the exhaust gas heat exchanger (14), and in that in the feed water supply line (38), in front of the connection point of the bypass line (42), seen in the direction of the feed water current, there is fitted a control valve (40) with a temperature sensor in the feed water supply line (38) behind the connection point of the bypass line (42), and with an associated regulator (46) which keeps the feed water inlet temperature for the exhaust gas heat exchanger (14) at a predetermined desired value by appropriate supply of feed water from the feed water container (30) into the feed water supply line (38).

Description

Die Erfindung betrifft ein Wärmekraftwerk mit einer Gasturbine, einer der Gasturbine abgasseitig nachgeschalteten Einrichtung zur Wärmerückgewinnung, einem der Einrichtung zur Wärmerückgewinnung zugeordneten Energieumsetzer mit zugeordnetem Kondensator und diesem über eine Kondensatleitung nachgeschalteten Speisewasserbehälter für die Einrichtung zur Wärmerückgewinnung, sowie mit einem der Einrichtung zur Wärmerückgewinnung abgasseitig nachgeschalteten Abgaswärmetauscher, der über eine Speisewasserhinführ- und eine Speisewasserrückführleitung unter Ausbildung eines geschlossenen Speisewasserkreislaufes am Speisewasserbehälter angeschlossen ist.The invention relates to a thermal power plant with a gas turbine, a device for heat recovery connected downstream of the gas turbine on the exhaust gas side, an energy converter associated with the device for heat recovery with an associated capacitor and this connected via a condensate line feed water tank for the device for heat recovery, and with a device downstream of the device for heat recovery on the exhaust gas side Exhaust gas heat exchanger, which is connected to the feed water tank via a feed water feed line and a feed water return line to form a closed feed water circuit.

Es ist bereits üblich, bei einem solchen Wärmekraftwerk Wasserdampf aus dem aus einer Dampfturbine bestehenden Energieumsetzer direkt in den Speisewasserbehälter zu leiten, um dort das Kondensat auf eine vorgegebene Speisewassertemperaturvorzuwärmen und zu entgasen. Der Dampfturbine wird also Dampf entzogen, der für die Energieumsetzung nicht mehr zur Verfügung steht.In such a thermal power plant, it is already common to direct water vapor from the energy converter consisting of a steam turbine directly into the feed water tank in order to preheat and degas the condensate there to a predetermined feed water temperature. Steam is therefore extracted from the steam turbine, which is no longer available for energy conversion.

Durch die DE-A3002615 und DE-A 1626151 ist es aber auch schon bekannt, in einem separaten Kreislauf Kondensat aus dem Speisewasserbehälter durch einen separaten, dem Energieumsetzer zugeordneten Wärmetauscher zu leiten und wieder zurück in den Speisewasserbehälter zu pumpen. Hierdurch findet eine Aufheizung des Speisewassers statt. Jedoch ist hierbei die rückgewinnbare Wärme durch die Temperatur des Speisewassers begrenzt.From DE-A3002615 and DE-A 1626151, however, it is also already known to conduct condensate from the feed water tank in a separate circuit through a separate heat exchanger assigned to the energy converter and to pump it back into the feed water tank. This causes the feed water to heat up. However, the heat that can be recovered is limited by the temperature of the feed water.

Der Erfindung liegt die Aufgabe zugrunde, den Gesamtwirkungsgrad eines Wärmekraftwerkes der eingangs erwähnten Art zu verbessern.The invention has for its object to improve the overall efficiency of a thermal power plant of the type mentioned.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäss durch die Merkmale im kennzeichnenden Teil des Patentanspruches 1.This object is achieved according to the invention by the features in the characterizing part of patent claim 1.

Mit dem über die Bypassleitung in die Speisewasserhinführleitung geführten Kondensat kann die Eintrittstemperatur des Speisewassers in den Abgaswärmetauscher abgesenkt werden, so dass mehr Abgaswärme in den Speisewasserkreislauf übertragen und auf die Zufuhr von z.B. Wasserdampf äus dem Energieumsetzer in den Speisewasserbehälter verzichtet werden kann. Der vorgegebene Sollwert, auf den die Speisewassereintrittstemperatur mit Hilfe des Regelventils in der Speisewasserhinführleitung geregelt wird, kann höher als der Taupunkt von H20 oder auch von Säuren im Abgas gewählt werden, so dass Korrosion an den Wärmeübertragungsflächen des Abgaswärmetauschers vermieden wird.With the condensate fed into the feed water supply line via the bypass line, the inlet temperature of the feed water into the exhaust gas heat exchanger can be reduced, so that more exhaust gas heat can be transferred to the feed water circuit and the supply of, for example, water vapor to the energy converter in the feed water tank can be dispensed with. The specified setpoint, to which the feed water inlet temperature is regulated with the help of the control valve in the feed water supply line, can be selected higher than the dew point of H 2 0 or also of acids in the exhaust gas, so that corrosion on the heat transfer surfaces of the exhaust gas heat exchanger is avoided.

Mit einer vorteilhaften Weiterbildung des erfindungsgemässen Kraftwerkes entsprechend Patentanspruch 2 wird gleichbleibender Druck im Speisewasserbehälter und damit gleichbleibende Temperatur des Speisewassers im Speisewasserbehälter erzielt, so dass die Entgasung des Speisewassers im Speisewasserbehälter stets bei einem Druck erfolgen kann, der genügend hoch ist, um die im Speisewasser gelösten Gase auszutreiben.With an advantageous development of the power plant according to the invention according to claim 2, constant pressure in the feed water tank and thus constant temperature of the feed water in the feed water tank is achieved, so that the degassing of the feed water in the feed water tank can always take place at a pressure which is sufficiently high to the dissolved in the feed water To expel gases.

Mit einer anderen vorteilhaften Weiterbildung des erfindungsgemässen Wärmekraftwerkes entsprechend Patentanspruch 3 kann erreicht werden, dass bei Laständerung der Gasturbine und damit verbundenen Änderungen der Abgastemperatur der Sollwert der Speisewassertemperatur in der Speisewasserrückführleitung innerhalb des Bereiches zwischen dem vorgegebenen Maximalwert und dem vorgegebenen Minimalwert gehalten wird.Another advantageous development of the thermal power plant according to the invention can achieve that when the gas turbine changes load and the associated changes in the exhaust gas temperature, the setpoint value of the feed water temperature in the feed water return line is kept within the range between the predetermined maximum value and the predetermined minimum value.

Die Erfindung und ihre Vorteile seien anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert:The invention and its advantages are explained in more detail with reference to the drawing using an exemplary embodiment:

In der Zeichnung ist das Prinzipschaltbild eines kombinierten Gas-Dampf-Wärmekraftwerkes dargestellt mit einer Gasturbine 2 und einer Dampfturbine 3 mit Hochdruckteil und Niederdruckteil.The drawing shows the basic circuit diagram of a combined gas-steam thermal power plant with a gas turbine 2 and a steam turbine 3 with a high-pressure part and a low-pressure part.

An die Abtriebswelle der Gasturbine 2 ist die Antriebswelle eines Verdichters 4 für Verbrennungsluft und eines elektrischen Generators 5 angekoppelt. Ferner ist eine Brennkammer 8 vorgesehen, an der der Abluftstutzen des Verdichters 4 und der Zuführstutzen der Gasturbine 2 für Verbrennungsgas angeschlossen sind. An der Abtriebswelle der Dampfturbine 3 ist die Antriebswelle eines elektrischen Generators 6 angekoppelt.The drive shaft of a compressor 4 for combustion air and an electric generator 5 is coupled to the output shaft of the gas turbine 2. Furthermore, a combustion chamber 8 is provided, to which the exhaust port of the compressor 4 and the feed port of the gas turbine 2 for combustion gas are connected. The drive shaft of an electric generator 6 is coupled to the output shaft of the steam turbine 3.

Am Abführstutzen der Gasturbine 2 für Abgas ist ein Abhitzedampferzeuger 7 angeschlossen mit einem unmittelbar am Abführstutzen der Gasturbine 2 für Abgas angeschlossenen Hochdruckdampfüberhitzer 11 und zu diesem im Abgasstrom in der angegebenen Reihenfolge in Serie geschalteten Hochdruckverdampfer 13, Hochdruckeconomiser 15, Niederdruckdampfüberhitzer 17, Niederdruckverdampfer 9 und Niederdruckeconomiser 12.A waste heat steam generator 7 is connected to the discharge port of the gas turbine 2 for exhaust gas, with a high-pressure steam superheater 11 connected directly to the discharge port of the gas turbine 2 for exhaust gas, and to the high-pressure evaporator 13, high-pressure economizer 15, low-pressure steam superheater 17, low-pressure evaporator 9 and low-pressure economizer connected in series in the exhaust gas stream 12th

Zum Abhitzedampferzeuger 7 gehören ferner eine Hochdruckdampftrommel 22 und eine Niederdruckdampftrommel 28. An der Hochdruckdampftrommel 22 ist der Speisewasseraustritt des Hochdruckeconomisers 15 und der Austritt des Hochdruckverdampfers 13 angeschlossen. Der Speisewasseraustritt der Hochdruckdampftrommel 22 ist über eine Umwälzpumpe 24 am Eintritt des Hochdruckverdampfers 13 angeschlossen. Der Dampfaustritt der Hochdruckdampftrommel 22 ist am Dampfeintritt des Hochdruckdampfüberhitzers 11 angeschlossen.The heat recovery steam generator 7 also includes a high-pressure steam drum 22 and a low-pressure steam drum 28. The feed water outlet of the high-pressure economizer 15 and the outlet of the high-pressure evaporator 13 are connected to the high-pressure steam drum 22. The feed water outlet of the high pressure steam drum 22 is connected to the inlet of the high pressure evaporator 13 via a circulation pump 24. The steam outlet of the high pressure steam drum 22 is connected to the steam inlet of the high pressure steam superheater 11.

Der Austritt des Niederdruckeconomisers 12 und der Austritt des Niederdruckverdampfers 9 sind an der Niederdruckdampftrommel 28 angeschlossen. Der Speisewasseraustritt der Niederdruckdampftrommel 28 ist sowohl über eine Speisewasserpumpe 26 am Speisewassereintritt des Hochdruckeconomisers 15 als auch über eine weitere Umwälzpumpe 10 am Eintritt des Niederdruckverdampfers 9 angeschlossen. Der Dampfaustritt der Niederdruckdampftrommel 28 ist am Dampfeintritt des Niederdruckdampfüberhitzers 17 angeschlossen. Der Frischdampfaustritt des Hochdruckdampfüberhitzers 11 ist am Dampfeintritt des Hochdruckteiles der Dampfturbine 3 und der Frischdampfaustritt des Niederdruckdampfüberhitzers 17 am Dampfeintritt des Niederdruckteils der Dampfturbine 3 angeschlossen. Von einem Speisewasserbehälter 30 führt eine eine Speisewasserpumpe 31 aufweisende Speisewasserleitung 32 zum Speisewassereintritt des Niederdruckeconomisers 12.The outlet of the low-pressure economizer 12 and the outlet of the low-pressure evaporator 9 are connected to the low-pressure steam drum 28. The feed water outlet of the low-pressure steam drum 28 is connected both via a feed water pump 26 at the feed water inlet of the high-pressure economizer 15 and via a further circulation pump 10 at the inlet of the low-pressure evaporator 9. The steam outlet of the low-pressure steam drum 28 is connected to the steam inlet of the low-pressure steam superheater 17. The live steam outlet of the high pressure steam superheater 11 is connected to the steam inlet of the high pressure part of the steam turbine 3 and the live steam outlet of the low pressure steam superheater 17 is connected to the steam inlet of the low pressure part of the steam turbine 3. A feed water line 32 having a feed water pump 31 leads from a feed water container 30 to the feed water inlet of the low-pressure economizer 12.

Dem Abdampfstutzen der Dampfturbine 3 ist über eine Abdampfleitung 33 ein Kondensator 34 nachgeschaltet, der auf der Kondensataustrittsseite einen Hotwell 35 aufweist. Dieser Hotwell 35 ist über eine eine Kondensatpumpe 36 mit nachgeschaltetem Regelventil 43 aufweisende Kondensatleitung 37 am Speisewasserbehälter 30 angeschlossen. Ein Abgaswärmetauscher 14 ist an seiner Gasseite dem Niederdruckeconomiser 12 abgasseitig nachgeschaltet und an seiner Wasserseite über eine Speisewasserrückführleitung 39 mit dem Speisewasserbehälter 30 verbunden. Eine Speisewasserhinführleitung 38 mit einem Regelventil 40 und vorgeschalteter Umwälzpumpe 41 führt vom Speisewasserbehälter 30 ebenfalls zur Wasserseite des Abgaswärmetauschers 14.A condenser 34, which has a hotwell 35 on the condensate outlet side, is connected downstream of the evaporation nozzle of the steam turbine 3 via an exhaust steam line 33. This hotwell 35 is connected to the feed water tank 30 via a condensate line 37 having a condensate pump 36 with a downstream control valve 43. An exhaust gas heat exchanger 14 is connected on the gas side downstream of the low-pressure economizer 12 and is connected on its water side to the feed water tank 30 via a feed water return line 39. A feed water supply line 38 with a control valve 40 and upstream circulation pump 41 also leads from the feed water tank 30 to the water side of the exhaust gas heat exchanger 14.

Ferner führt eine Bypassleitung 42 für Kondensat von einer Anschlussstelle an der Kondensatleitung 37 zwischen der Kondensatpumpe 36 und dem Regelventil 43 zu einer Anschlussstelle an der Speisewasserhinführleitung 38 zwischen dem Regelventil 40 und dem Speisewassereintritt des Abgaswärmetauschers 14. Das Regelventil 43 weist einen Regler 45 mit einem Druckfühler im Speisewasserbehälter 30 und das Regelventil 40 einen Regler 46 mit je einem Temperaturfühler in der Speisewasserrückführleitung 39 und in der Speisewasserhinführleitung 38 zwischen dem Speisewassereintritt in den Abgaswärmetauscher 14 und der Anschlussstelle der Bypassleitung 42 auf.Furthermore, a bypass line 42 for condensate leads from a connection point on the condensate line 37 between the condensate pump 36 and the control valve 43 to a connection point on the feed water supply line 38 between the control valve 40 and the feed water inlet of the exhaust gas heat exchanger 14. The control valve 43 has a regulator 45 with a pressure sensor in the feed water tank 30 and the control valve 40 a controller 46, each with a temperature sensor in the feed water return line 39 and in the feed water return line 38 between the feed water inlet into the exhaust gas heat exchanger 14 and the connection point of the bypass line 42.

Aus dem Hotwell 35 strömt Kondensat über die Kondensatleitung 37, die Bypassleitung 42 und die Speisewasserhinführleitung 38 durch den Abgaswärmetauscher 14 über die Speisewasserrückführleitung 39 in den Speisewasserbehälter 30. An der Anschlussstelle der Bypassleitung 42 an die Speisewasserhinführleitung 38 wird das Kondensat mit über das Regelventil 40 geleitetem, wärmerem Speisewasser aus dem Speisewasserbehälter 30 vermischt, so dass die Eintrittstemperatur des Kondensats in den Abgaswärmetauscher 14 einen solchen Sollwert annimmt, z.B. 70°C, bei dem die Taupunkttemperatur des H20 und geringer SO2-Anteile im Abgas auf der Abgasseite des Abgaswärmetauschers 14 nicht unterschritten ist und deshalb Korrosion an den Wärmeübertragungsflächen des Abgaswärmetauschers 14 vermieden wird.Condensate flows out of the hotwell 35 via the condensate line 37, the bypass line 42 and the feed water supply line 38 through the exhaust gas heat exchanger 14 via the feed water return line 39 into the feed water tank 30 , warmer feed water from the feed water tank 30 mixed, so that the entry temperature of the condensate into the exhaust gas heat exchanger 14 assumes such a setpoint value, for example 70 ° C., at which the dew point temperature of the H 2 0 and lower SO 2 components in the exhaust gas on the exhaust gas side of the exhaust gas heat exchanger 14 is not undercut and therefore corrosion on the heat transfer surfaces of the exhaust gas heat exchanger 14 is avoided.

Der Druck im Speisewasserbehälter 30 wird auf einen vorgegebenen Sollwert, z.B. 1.2 bar, mit Hilfe des Regelventils 43 geregelt, mit dem kaltes Kondensat aus der Kondensatleitung 37 direkt in den Speisewasserbehälter 30 geführt wird.The pressure in the feed water tank 30 is set to a predetermined setpoint, e.g. 1.2 bar, regulated with the aid of the control valve 43, with which cold condensate from the condensate line 37 is fed directly into the feed water tank 30.

Wenn die Austrittstemperatur des Kondensats aus dem Abgaswärmetauscher 14 in der Speisewasserrückführleitung 39 z.B. durch Laständerungen der Gasturbine 2 oder der Dampfturbine 3 einen vorgegebenen Maximalwert überschreitet oder einen vorgegebenen Minimalwert unterschreitet, wird die Regelung der Eintrittstemperatur des Kondensats in den Abgaswärmetauscher 14 abgelöst und der über das Regelventil 40 in die Speisewasserhinführleitung 38 eingespeiste Speisewasserdurchsatz so eingestellt, dass die Austrittstemperatur des Speisewassers aus dem Abgaswärmetauscher 14 einen vorgegebenen Sollwert, z.B. 110°C, hat und die Regelung des Druckes im Speisewasserbehälter 30 auf den vorgegebenen Sollwert über das Regelventil 43 wirksam bleibt.If the outlet temperature of the condensate from the exhaust gas heat exchanger 14 in the feed water return line 39 e.g. changes in the load of the gas turbine 2 or the steam turbine 3 exceed a predetermined maximum value or fall below a predetermined minimum value, the regulation of the inlet temperature of the condensate in the exhaust gas heat exchanger 14 is replaced and the feed water throughput fed into the feed water supply line 38 via the control valve 40 is set such that the outlet temperature of the Feed water from the exhaust gas heat exchanger 14 a predetermined setpoint, for example 110 ° C, and the regulation of the pressure in the feed water tank 30 to the predetermined target value via the control valve 43 remains effective.

Claims (3)

1. Thermal power plant having a gas turbine (2), a heat recovery device (11, 13, 15, 17,9, 12) connected to the gas turbine on its exhaust gas side, an energy transducer (3) associated with the heat recovery device, with associated condenser (34) and feed water container (30) for the heat recovery device, connected to the condenser on the outlet side by means of a condensate line (37), and also having an exhaust gas heat exchanger (14) connected to the heat recovery device on its exhaust gas side, which exchanger is connected to the feed water container (30) by means of a feedwater supply line (38) and a feed water return line (39) forming a closed feed water circuit, characterised in that there is provided a bypass line (42) for condensate going from the condensate line (37) to the feed water inlet of the exhaust gas heat exchanger (14), and in that in the feed water supply line (38), in front of the connection point of the bypass line (42), seen in the direction of the feed water current, there is fitted a control valve (40) with a temperature sensor in the feed water supply line (38) behind the connection point of the bypass line (42), and with an associated regulator (46) which keeps the feed water inlet temperature for the exhaust gas heat exchanger (14) at a predetermined desired value by appropriate supply of feed water from the feed water container (30) into the feed water supply line (38).
2. Thermal power plant according to claim 1, characterised in that in the condensate line (37) behind the branch-off point of the bypass line (42), seen in the direction of the condensate stream, there is fitted a control valve (43) with a pressure sensor in the feed water container (30) and a regulator (45) which keeps the pressure in the feed water container (30) at a predetermined desired value by appropriate supply of condensate into the feed water container (30).
3. Thermal power plant according to claim 1, characterised in that a temperature sensor is fitted in the feed water return line (39) and connected to the regulator (46) of the control valve (40) in the feed water supply line (38) which, when a predetermined maximum value of the feed water temperature in the feed water return line (39) has been exceeded, and when a predetermined minimum value of the same has been fallen short of, keeps the feed water outlet temperature from the exhaust gas heat exchanger (14) at a predetermined desired value by appropriate supply of feed water:
EP85113145A 1984-10-29 1985-10-16 Thermal power plant Expired EP0180093B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85113145T ATE34802T1 (en) 1984-10-29 1985-10-16 THERMAL POWER PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3439567 1984-10-29
DE3439567 1984-10-29

Publications (2)

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EP0180093A1 EP0180093A1 (en) 1986-05-07
EP0180093B1 true EP0180093B1 (en) 1988-06-01

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EP85113145A Expired EP0180093B1 (en) 1984-10-29 1985-10-16 Thermal power plant

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EP (1) EP0180093B1 (en)
JP (1) JPS61108814A (en)
AT (1) ATE34802T1 (en)
DE (1) DE3563088D1 (en)
IN (1) IN161926B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0643452Y2 (en) * 1988-02-08 1994-11-14 株式会社三五 Silencer
US4976100A (en) * 1989-06-01 1990-12-11 Westinghouse Electric Corp. System and method for heat recovery in a combined cycle power plant
DE102009010020B4 (en) * 2009-02-21 2016-07-07 Flagsol Gmbh Feedwater degasser of a solar thermal power plant
DE102010054963B4 (en) * 2010-12-17 2017-06-01 Jumag Dampferzeuger Gmbh Pressure control for full degassing in feedwater vessels by means of controllable valve
DE102013204396A1 (en) * 2013-03-13 2014-09-18 Siemens Aktiengesellschaft Condensate preheater for a heat recovery steam generator
CN107697494B (en) * 2017-09-14 2019-02-22 江苏航天惠利特环保科技有限公司 A kind of coupled method device for recovering oil and gas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1626151A1 (en) * 1967-02-22 1971-01-14 Aeg Kanis Turbinen Thermal power plant with a steam turbine with reheater and with a gas turbine
CH613255A5 (en) * 1976-11-25 1979-09-14 Sulzer Ag System for the utilisation of waste heat from a gas flow to drive electrical generators
DE3002615A1 (en) * 1979-12-05 1981-06-11 BBC AG Brown, Boveri & Cie., Baden, Aargau Combined gas and steam turbine power plant - uses gas turbine waste heat to generate steam, preheats air-to-gas turbine compressor
CH655548B (en) * 1982-03-31 1986-04-30

Also Published As

Publication number Publication date
DE3563088D1 (en) 1988-07-07
JPS61108814A (en) 1986-05-27
ATE34802T1 (en) 1988-06-15
EP0180093A1 (en) 1986-05-07
IN161926B (en) 1988-02-27

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