EP2984301B1 - Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre - Google Patents

Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre Download PDF

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Publication number
EP2984301B1
EP2984301B1 EP14728486.3A EP14728486A EP2984301B1 EP 2984301 B1 EP2984301 B1 EP 2984301B1 EP 14728486 A EP14728486 A EP 14728486A EP 2984301 B1 EP2984301 B1 EP 2984301B1
Authority
EP
European Patent Office
Prior art keywords
overspeed protection
steam turbine
gas turbine
triggering
speed
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.)
Not-in-force
Application number
EP14728486.3A
Other languages
German (de)
English (en)
Other versions
EP2984301A1 (fr
Inventor
Martin Bennauer
Edwin Gobrecht
Martin Hallekamp
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 PL14728486T priority Critical patent/PL2984301T3/pl
Priority to EP14728486.3A priority patent/EP2984301B1/fr
Publication of EP2984301A1 publication Critical patent/EP2984301A1/fr
Application granted granted Critical
Publication of EP2984301B1 publication Critical patent/EP2984301B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/003—Arrangements for testing or measuring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/20—Checking operation of shut-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines

Definitions

  • the invention relates to a method for testing an overspeed protection of a combined cycle single-shaft plant, wherein during a test operation, the gas turbine and steam turbine are operated at a test speed, the generator is operated with a connected load and during the test operation, a load shedding takes place.
  • the speeds are determined and monitored.
  • the speed of a combined cycle power plant is at a constant frequency of 50 Hz or 60 Hz. It may happen that this speed is exceeded, which can be referred to as overspeed. If this overspeed exceeds a critical value, a protective mechanism should be provided by taking action and preventing any further increase in speed. In general, this will be done switching off the steam supply to the steam turbine and switching off the fuel supply to the gas turbine. In this case, a trip of the steam turbine to the gas turbine will thus take place.
  • the EP 2 372 482 A2 discloses a method and system for testing an overspeed protection system of a turbomachine.
  • the FR 2 947 300 A1 discloses a method for testing a turbomachine.
  • the object of the invention is to provide a method for testing a GuD single-shaft system, wherein the overspeed protection test of operating speeds from feasible.
  • This object is achieved by a method for testing an overspeed protection of a combined cycle gas turbine plant, wherein during a test operation, the gas turbine and steam turbine are operated at a test speed, wherein the generator is operated with a connected load, wherein during the test operation, a load shedding takes place The speed of the steam turbine increases and a DT overspeed protection is triggered when a DT tripping limit value is reached.
  • An essential idea of the invention is therefore that the steam and gas turbine is driven to a test speed corresponding to the operating speed of 50 Hz or 60 Hz, an electric generator, wherein an electric load is arranged on the electric generator.
  • This electrical load leads to increased torque on the rotors the gas and steam turbine.
  • a load shedding ie the electric load is abruptly switched off, the counteracting of the torque to the gas and steam turbine rotors, with the result that the speed increases more or less abruptly, since the control of steam supply and fuel supply to the gas turbine in Consequence of the inertia of the system does not comply.
  • the steam turbine initially reaches the DT triggering limit value, the DT overspeed protection being triggered, and subsequently the gas turbine reaches a GT limit value, the GT overspeed protection being triggered after reaching the GT limit value.
  • two triggering conditions must be achieved in succession in order first to trigger the overspeed protection of the steam turbine and then of the gas turbine.
  • the DT trip limit must be reached and then the GT limit.
  • the steam turbine is in test operation in a fully warmed condition. This means that the operating parameters of the steam turbine in the test mode are ideally achieved and no temporary effects are to be considered in the sharp operation.
  • the gas turbine is operated in test mode with lower power.
  • the gas turbine is operated in test mode with a constant exhaust gas temperature.
  • a time t tripping elapses between the triggering of the DT overspeed protection and the load shedding, and the triggering ⁇ t max applies, with a steam turbine trip taking place, if t triggering is > t max and triggering of the DT Overspeed protection has not yet occurred.
  • the FIG. 1 shows a GuD single-shaft system 1.
  • This GuD single-shaft system 1 comprises a steam turbine 2, a gas turbine 3 and an electric generator 4, which are connected to each other via a common shaft 5 to transmit torque.
  • a clutch 6 is arranged, with which the torque transmission can be interrupted.
  • an electrical load 9 or an electrical load 9 is connected via a switch 8.
  • the switch 8 is shown in the closed state.
  • the FIG. 2 shows a speed curve of the gas turbine (n GT ) and the steam turbine (n DT ).
  • speed curves show the speed curve of the gas turbine 3 and the steam turbine 2 with the clutch closed 6.
  • the gas turbine 3 and steam turbine 2 is operated at a constant speed of 3000 revolutions per minute.
  • the electrical load 9 is disconnected from the generator 4 via the switch 8.
  • the result is that the speed of the gas turbine (n GT ) and the steam turbine (n DT ) goes high for a short time and if a tripping limit has been reached, a trip of the steam turbine 2 3 takes place, resulting in a sharp decrease in the speed, as in FIG. 2 recognizable leads.
  • the sharp overspeed protection must be carried out with a, compared to normal operation, unaltered trip limit value of the overspeed protection.
  • the gas turbine 3 and steam turbine 2 are defined accelerated to the trigger limit of the associated overspeed protection.
  • the overspeed protection must ab juryn when exceeding the tripping limits, the corresponding actuators of gas turbine 3 and steam turbine 2 and thus prevent critical overspeed.
  • the sharp overspeed protection test is not a real safety requirement for functional safety, as the controllers approach the appropriate trip limits with a defined dynamic range and do not reach a critical overspeed.
  • both the gas turbine 3 and the steam turbine 2 are each equipped with a separate overspeed protection. Due to the mechanical coupling 6 between the gas turbine 3 and the steam turbine 2 in single-shaft systems, the speed of the steam turbine 2 can not be higher than the speed of the gas turbine 3. Furthermore, the gas turbine 3 must provide a sufficient boiler output for the sharp overspeed test of the steam turbine 2. Thus, the over-speed test of the steam turbine 2 can not be performed independently of the gas turbine 3.
  • the method for testing the overspeed protection of the CCGT 1 takes place as follows: during a test operation, the gas turbine 3 and the steam turbine 2 are operated at a test speed equal to the operating speed of 3000 revolutions per minute.
  • the generator 4 is operated with a connected load 9, wherein during the test operation for Time t load shedding takes place, whereby the speed of the steam turbine 2 and the gas turbine 3 increases and on reaching a DT tripping limit DT overspeed protection and GT overshoot protection is triggered when the GT tripping limit value is reached. The result is that the speed of the steam turbine 2 and the gas turbine 3 is reduced.
  • the mass moment of inertia or the start-up time constant influences the dynamic behavior of gas turbine 3 and steam turbine 2 after load shedding.
  • the ratio of the start-up time constant has an influence on the selection of the trip limit value.
  • the triggering limit value of the steam turbine overspeed protection can be set just above the maximum mains frequency (eg 61.5 Hz) without reducing the system availability (eg at 104 %).
  • the distance between the maximum permissible mains frequency and the triggering limit value of the steam turbine overspeed protection is selected such that no undesired trip occurs during operation.
  • Another constraint is that the triggering limit of the steam turbine overspeed protection is not greater than the gas turbine overspeed protection trip limit.
  • the gas turbine overspeed protection trip limit must be set to a value above the maximum speed after a load dump and below the critical overspeed.
  • the choice of the tripping limit value must be such that the steam turbine 2 reaches the tripping limit value before the gas turbine 3.
  • the control technology of the gas turbine 3 and steam turbines 2 of a CCGT 1 is extended so that a switch is installed, with the sharp overspeed test is activated.
  • This function is automatically deactivated after a maximum period of time to be set in order to protect the steam turbine 2 from contact with cold steam.
  • the maximum period must be selected according to the duration of the sharp overspeed test with the condition that the steam temperatures remain within the allowable range during the test.
  • the method is characterized as follows: depending on the switch, the load dump detection is first blocked in the gas turbine 3 and an automated, for example, a time-delayed opening of the switch 8 of the generator 4 is generated.
  • the speed controller set point is initially set to a value just above the triggering limit value of the steam turbine overspeed protection, which may be 105%, for example, with the controller to approach the limit value with a defined acceleration.
  • the amount of acceleration affects the duration of the test.
  • the limit frequency influence is deactivated, and then the influence of the gas turbine fire power on the steam turbine controller is suppressed.
  • the total quick-closing in the case of coupling failures must be regulated for the duration of the overspeed test, which is only necessary if the gas turbine 3 is tripped by the total quick-closing before the triggering limit value is reached.
  • the method for testing the overspeed protection of the CCGT 1 occurs as long as the steam turbine 2 is completely warmed up and is in operation for more than 5 hours.
  • the gas turbine 3 is operated with the lowest possible power and constant exhaust gas temperature, which is reflected by the IGV point. Pressing the switch in the control system activates the overspeed test. When the overspeed test is activated, the necessary switching operations will be automated, and the automated opening of the switch 8 will take place somewhat later. Then the gas turbine 3 and steam turbine 2 will drive the trip limit value in a defined manner.
  • the steam turbine 2 reaches its triggering limit first, with the gas turbine 3 shortly thereafter Tripping limit reached. This total process must not exceed a certain time to be set, since the steam then becomes inadmissibly cold. Therefore, the function of sharp over-speed tester is automatically deactivated automatically after a few seconds that can be adjusted, thereby generating a steam turbine trip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Claims (7)

  1. Procédé de test d'une protection vis-à-vis d'un surrégime d'une centrale à turbine à gaz à cycle combiné à un seul arbre ( 1 ),
    dans lequel, pendant un fonctionnement de test, on fait fonctionner la turbine ( 3 ) à gaz et la turbine ( 2 ) à vapeur à un régime de test, la génératrice ( 4 ) étant entraînée en ayant une charge raccordée,
    caractérisé en ce que,
    pendant le fonctionnement de test, a lieu un délestage de charge,
    le régime de la turbine ( 2 ) à vapeur augmentant et, lorsque est atteinte une valeur limite de déclenchement de la turbine à vapeur, une protection vis-à-vis d'un surrégime étant déclenchée.
  2. Procédé suivant la revendication 1,
    dans lequel la turbine ( 2 ) à vapeur atteint d'abord la valeur limite de déclenchement de la turbine à vapeur et, ensuite, la turbine ( 3 ) à gaz atteint une valeur limite de turbine à gaz et la protection vis-à-vis d'un surrégime est déclenchée après qu'est atteinte la valeur limite de turbine à vapeur.
  3. Procédé suivant la revendication 2,
    dans lequel on déclenche la protection vis-à-vis d'un surrégime de la turbine à gaz, après que la valeur limite de turbine à gaz est atteinte.
  4. Procédé suivant la revendication 1, 2 ou 3,
    dans lequel la turbine ( 2 ) à vapeur se trouve en fonctionnement de test, dans un état réchauffé complètement.
  5. Procédé suivant l'une des revendications précédentes,
    dans lequel on fait fonctionner la turbine ( 3 ) à gaz, dans le fonctionnement de test, à une puissance petite.
  6. Procédé suivant l'une des revendications précédentes,
    dans lequel on fait fonctionner la turbine ( 3 ) à gaz, en fonctionnement de test, à une température constante des gaz d'échappement.
  7. Procédé suivant l'une des revendications précédentes,
    dans lequel il se passe, entre le déclenchement de la protection vis-à-vis d'un surrégime de la turbine à vapeur et le délestage de charge, un temps tAuslösung et l'on a tAuslösung < tmax, un trip de la turbine à vapeur s'effectuant dès que tAuslösung > tmax et alors que le déclenchement de la protection vis-à-vis d'un surrégime de la turbine à vapeur n'a pas encore eu lieu.
EP14728486.3A 2013-06-06 2014-05-26 Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre Not-in-force EP2984301B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL14728486T PL2984301T3 (pl) 2013-06-06 2014-05-26 Sposób testowania blokowania nadmiernej liczby obrotów jednowałowej turbiny gazowo- parowej
EP14728486.3A EP2984301B1 (fr) 2013-06-06 2014-05-26 Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13170738.2A EP2811119A1 (fr) 2013-06-06 2013-06-06 Procédé de test d'une protection contre le surrégime d'une installation GuD à un arbre
PCT/EP2014/060773 WO2014195163A1 (fr) 2013-06-06 2014-05-26 Procédé pour tester une protection contre le sur-régime d'une installation à cycle combiné mono-arbre
EP14728486.3A EP2984301B1 (fr) 2013-06-06 2014-05-26 Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre

Publications (2)

Publication Number Publication Date
EP2984301A1 EP2984301A1 (fr) 2016-02-17
EP2984301B1 true EP2984301B1 (fr) 2017-04-26

Family

ID=48577560

Family Applications (2)

Application Number Title Priority Date Filing Date
EP13170738.2A Withdrawn EP2811119A1 (fr) 2013-06-06 2013-06-06 Procédé de test d'une protection contre le surrégime d'une installation GuD à un arbre
EP14728486.3A Not-in-force EP2984301B1 (fr) 2013-06-06 2014-05-26 Procédé de test d'une protection contre le surrégime d'une installation gud à un arbre

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP13170738.2A Withdrawn EP2811119A1 (fr) 2013-06-06 2013-06-06 Procédé de test d'une protection contre le surrégime d'une installation GuD à un arbre

Country Status (8)

Country Link
US (1) US9976440B2 (fr)
EP (2) EP2811119A1 (fr)
JP (1) JP6185162B2 (fr)
KR (1) KR101846639B1 (fr)
CN (1) CN105264182B (fr)
PL (1) PL2984301T3 (fr)
RU (1) RU2629244C2 (fr)
WO (1) WO2014195163A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10316700B2 (en) * 2015-02-24 2019-06-11 Siemens Aktiengesellschaft Combined cycle power plant having supercritical steam turbine
JP6944406B2 (ja) 2018-03-29 2021-10-06 三菱パワー株式会社 一軸コンバインドサイクルプラント、一軸コンバインドサイクルプラントの試験方法および一軸コンバインドサイクルプラントの制御装置

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
SU848710A1 (ru) * 1979-12-25 1981-07-23 Предприятие П/Я А-3513 Система автоматического регулировани пАРОгАзОВОй уСТАНОВКи
US6116853A (en) * 1998-11-13 2000-09-12 Siemens Aktiengesellschaft Method and apparatus for checking the operating reliability of a turbine during load shedding
US6785633B2 (en) * 2001-12-28 2004-08-31 General Electric Company Method and apparatus for assessing performance of combined cycle power-plants
JP3930462B2 (ja) * 2003-08-01 2007-06-13 株式会社日立製作所 一軸コンバインドサイクル発電設備及びその運転方法
US7194865B2 (en) * 2004-08-30 2007-03-27 Compressor Controls Corporation Turbine overspeed protection
JP2008248875A (ja) * 2007-03-08 2008-10-16 Kawasaki Plant Systems Ltd ガスタービン発電システムおよびその運転制御方法
WO2009118332A2 (fr) * 2008-03-25 2009-10-01 Alstom Technology Ltd Centrale électrique et procédé de fonctionnement
FR2947300B1 (fr) * 2009-06-25 2011-07-15 Snecma Procede de realisation d'un test de la chaine de protection d'une turbomachine contre les survitesses lors d'un demarrage.
US8661880B2 (en) * 2010-03-23 2014-03-04 General Electric Company Method and system for testing an overspeed protection system of a powerplant
US8370100B2 (en) * 2010-03-23 2013-02-05 General Electric Company Method for determining when to perform a test of an overspeed protection system of a powerplant machine
US8365583B2 (en) * 2010-03-23 2013-02-05 General Electric Company Method and system for testing an overspeed protection system of a powerplant machine
US8756939B2 (en) 2010-03-23 2014-06-24 General Electric Company Method and system for testing an overspeed protection system of a powerplant machine
EP2458180A1 (fr) * 2010-11-30 2012-05-30 Siemens Aktiengesellschaft Procédé de fonctionnement d'une turbine à gaz lors de la régulation de la charge, dispositif de réglage du fonctionnement d'une turbine à gaz et centrale
CN102071978A (zh) * 2010-12-08 2011-05-25 广东电网公司电力科学研究院 一种汽轮机甩负荷工况下超速保护的方法
JP5781312B2 (ja) * 2011-01-12 2015-09-16 三菱日立パワーシステムズ株式会社 ガスタービンの信頼性評価試験方法
JP2012197750A (ja) * 2011-03-22 2012-10-18 Toshiba Corp 発電プラントおよび発電プラント運転方法
EP2848773A1 (fr) * 2013-09-17 2015-03-18 Siemens Aktiengesellschaft Procédé de contrôle d'un dispositif de protection contre le surrégime d'une installation à un arbre

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Also Published As

Publication number Publication date
JP2016523331A (ja) 2016-08-08
KR20160015310A (ko) 2016-02-12
CN105264182B (zh) 2016-12-28
PL2984301T3 (pl) 2017-10-31
JP6185162B2 (ja) 2017-08-23
KR101846639B1 (ko) 2018-04-06
EP2811119A1 (fr) 2014-12-10
WO2014195163A1 (fr) 2014-12-11
RU2015155901A (ru) 2017-07-17
US9976440B2 (en) 2018-05-22
EP2984301A1 (fr) 2016-02-17
US20160123183A1 (en) 2016-05-05
RU2629244C2 (ru) 2017-08-28
CN105264182A (zh) 2016-01-20

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