EP3022402A2 - Method for testing an overspeed protection device of a single-shaft plant - Google Patents

Method for testing an overspeed protection device of a single-shaft plant

Info

Publication number
EP3022402A2
EP3022402A2 EP14771808.4A EP14771808A EP3022402A2 EP 3022402 A2 EP3022402 A2 EP 3022402A2 EP 14771808 A EP14771808 A EP 14771808A EP 3022402 A2 EP3022402 A2 EP 3022402A2
Authority
EP
European Patent Office
Prior art keywords
steam turbine
speed
overspeed protection
gas turbine
shaft system
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
EP14771808.4A
Other languages
German (de)
French (fr)
Other versions
EP3022402B1 (en
Inventor
Martin Ophey
Thorsten Engler
Susanne Haas
Andreas Pahl
Marian-Peter Pieczyk
Martin Stapper
David Veltmann
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 EP14771808.4A priority Critical patent/EP3022402B1/en
Priority to PL14771808T priority patent/PL3022402T3/en
Publication of EP3022402A2 publication Critical patent/EP3022402A2/en
Application granted granted Critical
Publication of EP3022402B1 publication Critical patent/EP3022402B1/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
    • 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
    • F01D21/02—Shutting-down responsive to overspeed
    • 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

Definitions

  • the invention relates to a method for testing an overspeed protection device of a single-shaft system.
  • Energy is a gas turbine, a steam turbine and a generator arranged on a common strand.
  • the electrical energy is fed into an electrical network and the strand rotates at a speed corresponding to the rated speed of the single-shaft system, such as 50 Hz or 60 Hz.
  • the speed may increase to levels above the rated speed.
  • the single-shaft system is mechanically and thermally loaded excessively, resulting in a shortening of the life of the single-shaft system.
  • an overspeed protection device prevents further increase in the speed of the train, the limit speed being conventionally selected to be between the rated speed and the critical speed.
  • the overspeed protection device is checked by operating the single-shaft system in a test mode in which the limit value is lowered from the limit value during normal operation, thereby avoiding excessive load on the single-shaft system during test operation.
  • test mode it would be desirable in test mode the same
  • the object of the invention is to provide a method for testing an overspeed protection device of a single-shaft system, wherein the method does not lead to an excessive load on the single-shaft system.
  • the inventive method for testing an overspeed protection device of a single-shaft turbine having a gas turbine and a steam turbine comprises the steps of: b) operating the single-shaft system such that no steam is conducted into the steam turbine and the gas turbine drives the steam turbine; c) increasing the mass flow of the fuel introduced into the gas turbine such that the speed of the single-shaft system reaches a steam turbine limit speed, wherein the overspeed protection device is arranged such that a first overspeed protection is triggered as soon as the speed of the single-shaft system reaches the steam turbine limit speed; d) Check whether the first overspeed contactor is triggered.
  • the thermal load on the steam turbine during testing of the overspeed protection device is low, which gives the single-shaft system a long service life.
  • the method is easy to carry out because only the mass flow of the fuel introduced into the gas turbine is controlled in order to reach the steam turbine limit value speed.
  • the method is performed with the steps of: e) increasing the mass flow of the fuel introduced into the gas turbine such that the speed of the single-shaft system reaches a gas turbine limit speed higher than the steam turbine limit speed, the over-speed protection device being arranged such that a second overspeed protection is triggered as soon as the speed of the single-shaft system reaches the gas turbine limit speed; f) Check if the second overspeed protection is triggered.
  • the method preferably comprises the step of: a) evacuating the steam turbine. If there is a gas in the steam turbine during testing of the overspeed protection device, this is set in motion by the rotor of the steam turbine, which results in a release of so-called ventilation heat.
  • the ventilation heat can lead to a strong thermal load of the steam turbine, the strong thermal load leads to a shortening of the life of the steam turbine.
  • the single-shaft system preferably has a generator to which no electrical load is connected.
  • a single-shaft system 1 has a gas turbine 2, a steam turbine 3 and an electric generator 4.
  • the gas turbine 2 and the steam turbine 4 serve to generate rotational energy, wherein the rotational energy in the generator 4 is converted into electrical energy.
  • the generator 4 is arranged between the gas turbine 2 and the steam turbine 3.
  • the gas turbine 2 has a gas turbine shaft 5 and the steam turbine 3 has a steam turbine shaft 6.
  • the generator 4 and the gas turbine 2 are arranged together on the steam turbine shaft 6.
  • a separate generator shaft is provided for the generator 4, which is coupled by means of a coupling to the gas turbine shaft 5.
  • the figure shows that the steam turbine shaft 6 is connected to the gas turbine shaft 5 by means of a clutch 7.
  • the clutch 7 is set up so that the clutch 7 engages as soon as the steam turbine 3 overhauls the gas turbine 2, and disengages when the speed of the steam turbine 3 is smaller than that of the gas turbine 2.
  • the clutch 7 may be, for example, an SSS clutch.
  • the clutch 7 is changed so that the gas turbine 2 can drive the steam turbine 3, so that the gas turbine 2 and the steam turbine 3 rotate at the same speed. This can be done, for example, that the clutch 7 is mechanically blocked.
  • the clutch 7 is removed and replaced by an intermediate shaft, by means of which the gas turbine shaft 5 and the steam turbine shaft 6 are firmly connected to each other.
  • the single-shaft system 1 has an overspeed protection device.
  • the overspeed protection device is set up such that a first overspeed protection is triggered as soon as the speed of the steam turbine 3 reaches a steam turbine limit speed, and a second overspeed protection is triggered as soon as the speed of the gas turbine 2 reaches a gas turbine limit value speed.
  • the method for testing an overspeed protection device of a single-shaft plant 1 having a gas turbine 2, a steam turbine 3 and a generator 4 to which no electric load is connected is carried out with the steps of: a) evacuating the steam turbine 3; al) engagement of the clutch; b) Operating the single-shaft system 1 such that no steam is conducted into the steam turbine 3 and the vacuum in the steam turbine 3 is maintained and the gas turbine 2 drives the steam turbine 3, so that the gas turbine 2 and the steam turbine 3 rotate at the same speed ; c) increasing the mass flow of the fuel introduced into the gas turbine 2 in such a way that the rotational speed of the single-shaft plant 1 is a steam turbine limit value achieved number, wherein the overspeed protection device is arranged such that a first overspeed protection is triggered when the speed of the single-shaft system 1 reaches the steam turbine limit speed; d) checking whether the first overspeed protection is triggered; e) increasing the mass flow of the fuel introduced into the gas turbine 2 such that the speed of the single-
  • the steam turbine limit speed may be 106 to 108% of the rated speed and the gas turbine limit speed may be 0.1 to 0.5% greater than the steam turbine limit speed.

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

Abstract

The invention relates to a method for testing an overspeed protection device of a single-shaft plant (1) comprising a gas turbine (2) and a steam turbine (3), which method comprises the steps: b) operating the single-shaft plant (1) in such a way that no steam is fed into the steam turbine (3) and the gas turbine (2) drives the steam turbine (3); c) increasing the mass flow rate of the fuel fed into the gas turbine (2) in such a way that the speed of the single-shaft plant (1) reaches a steam turbine limit speed, the overspeed protection device being set in such a way that a first overspeed protection is triggered as soon as the speed of the single-shaft plant (1) reaches the steam turbine limit speed; d) carrying out a test to determine whether the first overspeed protection is triggered.

Description

Beschreibung description
Verfahren zum Prüfen einer Überdrehzahlschutzeinrichtung einer Einwellenanlage Method for testing an overspeed protection device of a single-shaft system
Die Erfindung betrifft ein Verfahren zum Prüfen einer Überdrehzahlschutzeinrichtung einer Einwellenanlage. Bei einer Einwellenanlage zur Erzeugung von elektrischerThe invention relates to a method for testing an overspeed protection device of a single-shaft system. In a single-shaft system for the production of electrical
Energie sind eine Gasturbine, eine Dampfturbine und ein Generator auf einem gemeinsamen Strang angeordnet. Im Normalbetrieb der Einwellenanlage wird die elektrische Energie in ein elektrisches Netz eingespeist und der Strang rotiert mit einer Drehzahl, die der Nenndrehzahl der Einwellenanlage entspricht, wie beispielsweise 50 Hz oder 60 Hz. Bei einem Störfall, insbesondere bei einem Abfall der an dem Generator angeschlossenen elektrischen Last, kann die Drehzahl auf Werte oberhalb der Nenndrehzahl ansteigen. Wenn die Drehzahl eine kritische Drehzahl erreicht, wird die Einwellenanlage mechanisch und thermisch übermäßig belastet, was in einer Verkürzung der Lebensdauer der Einwellenanlage resultiert. Energy is a gas turbine, a steam turbine and a generator arranged on a common strand. In normal operation of the single-shaft system, the electrical energy is fed into an electrical network and the strand rotates at a speed corresponding to the rated speed of the single-shaft system, such as 50 Hz or 60 Hz. In an accident, especially in a drop in the generator connected to the electrical Load, the speed may increase to levels above the rated speed. When the speed reaches a critical speed, the single-shaft system is mechanically and thermally loaded excessively, resulting in a shortening of the life of the single-shaft system.
Bei Erreichen einer Grenzwertdrehzahl greift eine Überdreh- zahlschutzeinrichtung, die ein weiteres Ansteigen der Drehzahl des Strangs unterbindet, wobei die Grenzwertdrehzahl herkömmlich derart gewählt wird, dass sie zwischen der Nenndrehzahl und der kritischen Drehzahl liegt. Herkömmlich wird die Überdrehzahlschutzeinrichtung überprüft, indem die Ein- wellenanlage in einem Testbetrieb betrieben wird, bei dem die Grenzwertdrehzahl gegenüber der Grenzwertdrehzahl im Normal - betrieb abgesenkt wird, um dadurch während des Testbetriebs eine übermäßige Belastung der Einwellenanlage zu vermeiden. Wünschenswert wäre es jedoch im Testbetrieb die gleiche When a limit speed is reached, an overspeed protection device prevents further increase in the speed of the train, the limit speed being conventionally selected to be between the rated speed and the critical speed. Conventionally, the overspeed protection device is checked by operating the single-shaft system in a test mode in which the limit value is lowered from the limit value during normal operation, thereby avoiding excessive load on the single-shaft system during test operation. However, it would be desirable in test mode the same
Grenzwertdrehzahl wie im Normalbetrieb zu verwenden. Ein solcher Test ist zudem in einigen Ländern, wie beispielsweise in Südkorea, zwingend vorgeschrieben. Aufgabe der Erfindung ist es, ein Verfahren zum Prüfen einer Überdrehzahlschutzeinrichtung einer Einwellenanlage zu schaffen, wobei das Verfahren nicht zu einer übermäßigen Belastung der Einwellenanlage führt. Limit speed to use as in normal operation. Such a test is also compulsory in some countries, such as South Korea. The object of the invention is to provide a method for testing an overspeed protection device of a single-shaft system, wherein the method does not lead to an excessive load on the single-shaft system.
Das erfindungsgemäße Verfahren zum Prüfen einer Überdrehzahl - Schutzeinrichtung einer eine Gasturbine und eine Dampfturbine aufweisenden Einwellenanlage weist die Schritte auf: b) Be- treiben der Einwellenanlage derart, dass kein Dampf in die Dampfturbine geleitet wird und die Gasturbine die Dampfturbine antreibt; c) Erhöhen des Massenstroms des in die Gasturbine eingeleiteten Brennstoffs derart, dass die Drehzahl der Einwellenanlage eine Dampfturbinengrenzwertdrehzahl erreicht, wobei die Überdrehzahlschutzeinrichtung derart eingerichtet ist, dass ein erster Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage die Dampfturbinengrenzwertdrehzahl erreicht; d) Prüfen, ob der erste Überdrehzahl - schütz ausgelöst wird. Indem kein Dampf in die Dampfturbine geleitet wird, ist die thermische Belastung der Dampfturbine während des Prüfens der Überdrehzahlschutzeinrichtung gering, wodurch die Einwellenanlage eine lange Lebensdauer hat. Zudem ist das Verfahren einfach durchführbar, weil zum Erreichen der Dampfturbinengrenzwertdrehzahl lediglich der Massenstrom des in die Gasturbine eingeleiteten Brennstoffs geregelt wird . The inventive method for testing an overspeed protection device of a single-shaft turbine having a gas turbine and a steam turbine comprises the steps of: b) operating the single-shaft system such that no steam is conducted into the steam turbine and the gas turbine drives the steam turbine; c) increasing the mass flow of the fuel introduced into the gas turbine such that the speed of the single-shaft system reaches a steam turbine limit speed, wherein the overspeed protection device is arranged such that a first overspeed protection is triggered as soon as the speed of the single-shaft system reaches the steam turbine limit speed; d) Check whether the first overspeed contactor is triggered. By not passing steam into the steam turbine, the thermal load on the steam turbine during testing of the overspeed protection device is low, which gives the single-shaft system a long service life. In addition, the method is easy to carry out because only the mass flow of the fuel introduced into the gas turbine is controlled in order to reach the steam turbine limit value speed.
Bevorzugt wird das Verfahren mit den Schritten durchgeführt: e) Erhöhen des Massenstroms des in die Gasturbine eingeleite- ten Brennstoffs derart, dass die Drehzahl der Einwellenanlage eine Gasturbinengrenzwertdrehzahl erreicht, die höher als die Dampfturbinengrenzwertdrehzahl ist, wobei die Überdrehzahl - Schutzeinrichtung derart eingerichtet ist, dass ein zweiter Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage die Gasturbinengrenzwertdrehzahl erreicht; f) Prüfen, ob der zweite Überdrehzahlschutz ausgelöst wird. Preferably, the method is performed with the steps of: e) increasing the mass flow of the fuel introduced into the gas turbine such that the speed of the single-shaft system reaches a gas turbine limit speed higher than the steam turbine limit speed, the over-speed protection device being arranged such that a second overspeed protection is triggered as soon as the speed of the single-shaft system reaches the gas turbine limit speed; f) Check if the second overspeed protection is triggered.
Indem die Gasturbinengrenzwertdrehzahl höher als die Dampf- turbinengrenzwertdrehzahl ist, kann somit das Prüfen des zweiten Überdrehzahlschutzes nach erfolgter Prüfung des ersten Überdrehzahlschutzes und unabhängig von dieser Prüfung durchgeführt werden. Das Verfahren weist bevorzugt den Schritt auf: a) Evakuieren der Dampfturbine. Befindet sich während des Prüfens der Überdrehzahlschutzeinrichtung ein Gas in Dampfturbine, so wird dieses von dem Rotor der Dampfturbine in Bewegung gesetzt, was in einer Freisetzung einer sogenannten Ventilationswärme resultiert. Die Ventilationswärme kann zu einer starken thermischen Belastung der Dampfturbine führen, wobei die starke thermische Belastung zu einer Verkürzung der Lebensdauer der Dampfturbine führt. Indem die Dampfturbine evakuiert wird, wird die Bildung der Ventilationswärme vorteilhaft unterbun- den, wodurch die Lebensdauer der Dampfturbine der Einwellenanlage lang ist. Thus, by having the gas turbine limit speed higher than the steam turbine limit speed, the testing of the second overspeed protection after the first overspeed protection has been tested and carried out independently of this test. The method preferably comprises the step of: a) evacuating the steam turbine. If there is a gas in the steam turbine during testing of the overspeed protection device, this is set in motion by the rotor of the steam turbine, which results in a release of so-called ventilation heat. The ventilation heat can lead to a strong thermal load of the steam turbine, the strong thermal load leads to a shortening of the life of the steam turbine. By evacuating the steam turbine, the formation of the ventilation heat is advantageously prevented, whereby the life of the steam turbine of the single-shaft system is long.
Die Einwellenanlage weist bevorzugt einen Generator auf, an dem keine elektrische Last angeschlossen ist. Indem die The single-shaft system preferably has a generator to which no electrical load is connected. By the
Dampfturbinengrenzwertdrehzahl und die Gasturbinengrenzwert- drehzahl durch Erhöhen des Massenstroms des Brennstoffs und/oder des Dampfs erreicht wird und nicht etwa durch ein Abwerfen der elektrischen Last, können die Dampfturbinengrenzwertdrehzahl und die Gasturbinengrenzwertdrehzahl vor- teilhaft langsam angefahren werden und eine kritische Drehzahl der Einwellenanlage vorteilhaft vermieden werden. Dadurch kann eine übermäßige mechanische und thermische Belastung der Einwellenanlage während des Prüfens der Überdrehzahlschutzeinrichtung vermieden werden, wodurch die Lebens- dauer der Einwellenanlage lang ist. Die übermäßige Belastung kann mit dem erfindungsgemäßen Verfahren selbst dann vermieden werden, wenn für die Gasturbinengrenzwertdrehzahl und die Dampfturbinengrenzwertdrehzahl die gleichen Grenzwertdrehzahlen wie im Normalbetrieb der Einwellenanlage eingesetzt wer- den. Im Folgenden wird anhand der beigefügten schematischen Zeichnung das erfindungsgemäße Verfahren näher erläutert. Die Figur zeigt eine schematische Ansicht einer Einwellenanlage. Wie es aus der Figur ersichtlich ist, weist eine Einwellenanlage 1 eine Gasturbine 2, eine Dampfturbine 3 und einen elektrischen Generator 4 auf. Die Gasturbine 2 und die Dampfturbine 4 dienen zur Erzeugung von Rotationsenergie, wobei die Rotationsenergie in dem Generator 4 in elektrische Ener- gie umgewandelt wird. Der Generator 4 ist zwischen der Gasturbine 2 und der Dampfturbine 3 angeordnet . Die Gasturbine 2 weist eine Gasturbinenwelle 5 und die Dampfturbine 3 weist eine Dampfturbinenwelle 6 auf. In der Figur ist dargestellt, dass der Generator 4 und die Gasturbine 2 zusammen auf der Dampfturbinenwelle 6 angeordnet sind. Es ist jedoch ebenfalls denkbar, dass für den Generator 4 eine separate Generatorwelle vorgesehen wird, die mittels einer Kupplung an die Gasturbinenwelle 5 gekuppelt ist. Die Figur zeigt, dass die Dampfturbinenwelle 6 mittels einer Kupplung 7 mit der Gasturbinenwelle 5 verbunden. Für den Normalbetrieb ist die Kupplung 7 derart eingerichtet, dass die Kupplung 7 einkuppelt, sobald die Dampfturbine 3 die Gasturbine 2 überholt, und auskuppelt, wenn die Drehzahl der Dampf- turbine 3 kleiner als die der Gasturbine 2 ist. Die Kupplung 7 kann beispielsweise eine SSS-Kupplung sein. Ausgehend davon wird in einem Testbetrieb zum Prüfen der Überdrehzahleinrichtung die Kupplung 7 derart verändert, dass die Gasturbine 2 die Dampfturbine 3 antreiben kann, so dass die Gasturbine 2 und die Dampfturbine 3 mit der gleichen Drehzahl drehen. Dies kann beispielsweise dadurch erfolgen, dass die Kupplung 7 mechanisch blockiert wird. Alternativ ist denkbar, dass für den Testbetrieb die Kupplung 7 ausgebaut wird und durch eine Zwischenwelle ersetzt wird, mittels der die Gasturbinenwelle 5 und die Dampfturbinenwelle 6 fest miteinander verbunden werden . Um ein Ansteigen der Drehzahl der Einwellenanlage 1 auf einen kritischen Wert zu vermeiden, weist die Einwellenanlage 1 eine Überdrehzahlschutzeinrichtung auf. Die Überdrehzahl - Schutzeinrichtung ist dabei derart eingerichtet, dass ein erster Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Dampfturbine 3 eine Dampfturbinengrenzwertdrehzahl erreicht, und ein zweiter Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Gasturbine 2 eine Gasturbinengrenz - wertdrehzahl erreicht. Bei einem Auslösen des zweiten Über- drehzahlschutzes kann der Massenstrom des Brennstoffs Steam turbine limit and the Gasurbinengrenzwert- speed by increasing the mass flow of the fuel and / or steam is achieved and not by a drop in the electrical load, the steam turbine limit speed and the gas turbine limit speed can be approached advantageously slow and a critical speed of the single-shaft system can be advantageously avoided , As a result, excessive mechanical and thermal loading of the single-shaft system during testing of the overspeed protection device can be avoided, whereby the service life of the single-shaft system is long. The excessive load can be avoided with the method according to the invention even if the gas turbine limit value speed and the steam turbine limit value speed use the same limit speed as in normal operation of the single-shaft system. In the following, the method according to the invention is explained in more detail with reference to the accompanying schematic drawing. The figure shows a schematic view of a single-shaft system. As can be seen from the figure, a single-shaft system 1 has a gas turbine 2, a steam turbine 3 and an electric generator 4. The gas turbine 2 and the steam turbine 4 serve to generate rotational energy, wherein the rotational energy in the generator 4 is converted into electrical energy. The generator 4 is arranged between the gas turbine 2 and the steam turbine 3. The gas turbine 2 has a gas turbine shaft 5 and the steam turbine 3 has a steam turbine shaft 6. In the figure it is shown that the generator 4 and the gas turbine 2 are arranged together on the steam turbine shaft 6. However, it is also conceivable that a separate generator shaft is provided for the generator 4, which is coupled by means of a coupling to the gas turbine shaft 5. The figure shows that the steam turbine shaft 6 is connected to the gas turbine shaft 5 by means of a clutch 7. For normal operation, the clutch 7 is set up so that the clutch 7 engages as soon as the steam turbine 3 overhauls the gas turbine 2, and disengages when the speed of the steam turbine 3 is smaller than that of the gas turbine 2. The clutch 7 may be, for example, an SSS clutch. On the basis of this, in a test operation for checking the overspeed input device, the clutch 7 is changed so that the gas turbine 2 can drive the steam turbine 3, so that the gas turbine 2 and the steam turbine 3 rotate at the same speed. This can be done, for example, that the clutch 7 is mechanically blocked. Alternatively, it is conceivable that for the test operation, the clutch 7 is removed and replaced by an intermediate shaft, by means of which the gas turbine shaft 5 and the steam turbine shaft 6 are firmly connected to each other. In order to avoid an increase in the speed of the single-shaft system 1 to a critical value, the single-shaft system 1 has an overspeed protection device. The overspeed protection device is set up such that a first overspeed protection is triggered as soon as the speed of the steam turbine 3 reaches a steam turbine limit speed, and a second overspeed protection is triggered as soon as the speed of the gas turbine 2 reaches a gas turbine limit value speed. When triggering the second overspeed protection, the mass flow of the fuel
und/oder der Massenstrom des Dampfs unterbrochen werden. and / or the mass flow of the steam are interrupted.
Wenn die Gasturbine 2 und die Dampfturbine 3 bei ihrer Nenndrehzahl rotieren, kann durch Schließen eines Schalters 9 ein elektrischer Verbraucher 10 an einen elektrischen Anschluss 8 des Generators 4 angeschlossen werden. Der Stromverbrauch des Verbrauchers 10 entspricht einer an den Generator 4 angeschlossenen elektrischen Last. Durch Öffnen des Schalters 9 wird sichergestellt, dass während des Prüfens der Überdreh- zahlschutzeinrichtung keine elektrische Last an dem Generator 4 angeschlossen ist. When the gas turbine 2 and the steam turbine 3 rotate at their rated speed, by closing a switch 9, an electrical load 10 can be connected to an electrical terminal 8 of the generator 4. The power consumption of the consumer 10 corresponds to an electrical load connected to the generator 4. Opening the switch 9 ensures that no electrical load is connected to the generator 4 during testing of the overspeed protection device.
Anhand eines Beispiels wird im Folgenden das erfindungsgemäße Verfahren näher erläutert . By way of example, the method according to the invention will be explained in more detail below.
Beispielhaft wird das Verfahren zum Prüfen einer Überdrehzahlschutzeinrichtung einer eine Gasturbine 2, eine Dampfturbine 3 und einen Generator 4, an dem keine elektrische Last angeschlossen ist, aufweisenden Einwellenanlage 1 mit den Schritten durchgeführt: a) Evakuieren der Dampfturbine 3; al) Einrücken der Kupplung; b) Betreiben der Einwellenanlage 1 derart, dass kein Dampf in die Dampfturbine 3 geleitet wird und das Vakuum in der Dampfturbine 3 aufrecht erhalten wird sowie die Gasturbine 2 die Dampfturbine 3 antreibt, so dass die Gasturbine 2 und die Dampfturbine 3 mit der gleichen Drehzahl rotieren; c) Erhöhen des Massenstroms des in die Gasturbine 2 eingeleiteten Brennstoffs derart, dass die Drehzahl der Einwellenanlage 1 eine Dampfturbinengrenzwertdreh- zahl erreicht, wobei die Überdrehzahlschutzeinrichtung derart eingerichtet ist, dass ein erster Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage 1 die Dampfturbinengrenzwertdrehzahl erreicht; d) Prüfen, ob der erste Überdrehzahlschutz ausgelöst wird, e) Erhöhen des Massenstroms des in die Gasturbine 2 eingeleiteten Brennstoffs derart, dass die Drehzahl der Einwellenanlage 1 eine Gastur- binengrenzwertdrehzahl erreicht, die höher als die Dampfturbinengrenzwertdrehzahl ist, wobei die Überdrehzahlschutzein- richtung derart eingerichtet ist, dass ein zweiter Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage 1 die Gasturbinengrenzwertdrehzahl erreicht; f) Prüfen, ob der zweite Überdrehzahlschutz ausgelöst wird. Dabei kann die Dampfturbinengrenzwertdrehzahl 106 bis 108 % der Nenndrehzahl betragen und die Gasturbinengrenzwertdrehzahl 0,1 bis 0,5 % größer als die Dampfturbinengrenzwertdrehzahl sein. Obwohl die Erfindung im Detail durch das bevorzugte Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen. By way of example, the method for testing an overspeed protection device of a single-shaft plant 1 having a gas turbine 2, a steam turbine 3 and a generator 4 to which no electric load is connected is carried out with the steps of: a) evacuating the steam turbine 3; al) engagement of the clutch; b) Operating the single-shaft system 1 such that no steam is conducted into the steam turbine 3 and the vacuum in the steam turbine 3 is maintained and the gas turbine 2 drives the steam turbine 3, so that the gas turbine 2 and the steam turbine 3 rotate at the same speed ; c) increasing the mass flow of the fuel introduced into the gas turbine 2 in such a way that the rotational speed of the single-shaft plant 1 is a steam turbine limit value achieved number, wherein the overspeed protection device is arranged such that a first overspeed protection is triggered when the speed of the single-shaft system 1 reaches the steam turbine limit speed; d) checking whether the first overspeed protection is triggered; e) increasing the mass flow of the fuel introduced into the gas turbine 2 such that the speed of the single-shaft system 1 reaches a gas turbine limit speed which is higher than the steam turbine limit speed, the overspeed protection device being such is set up that a second overspeed protection is triggered when the speed of the single-shaft system 1 reaches the gas turbine limit speed; f) Check if the second overspeed protection is triggered. Here, the steam turbine limit speed may be 106 to 108% of the rated speed and the gas turbine limit speed may be 0.1 to 0.5% greater than the steam turbine limit speed. Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims

Patentansprüche claims
1. Verfahren zum Prüfen einer Überdrehzahlschutzeinrichtung einer eine Gasturbine (2) und eine Dampfturbine (3) aufweisenden Einwellenanlage (1) mit den Schritten: 1. A method for testing an overspeed protection device of a gas turbine (2) and a steam turbine (3) having single-shaft system (1) with the steps:
b) Betreiben der Einwellenanlage (1) derart, dass kein Dampf in die Dampfturbine (3) geleitet wird und die Gasturbine (2) die Dampfturbine (3) antreibt;  b) operating the single-shaft system (1) such that no steam is conducted into the steam turbine (3) and the gas turbine (2) drives the steam turbine (3);
c) Erhöhen des Massenstroms des in die Gasturbine (2) eingeleiteten Brennstoffs derart, dass die Drehzahl der Einwellenanlage (1) eine Dampfturbinengrenzwertdrehzahl erreicht, wobei die Überdrehzahlschutzeinrichtung derart eingerichtet ist, dass ein erster Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage (1) die  c) increasing the mass flow of the fuel introduced into the gas turbine (2) such that the speed of the single-shaft system (1) reaches a steam turbine limit speed, wherein the overspeed protection device is set up such that a first overspeed protection is triggered as soon as the rotational speed of the single-shaft system (1) the
Dampfturbinengrenzwertdrehzahl erreicht ;  Steam turbine limit speed reached;
d) Prüfen, ob der erste Überdrehzahlschutz ausgelöst wird.  d) Check if the first overspeed protection is triggered.
2. Verfahren gemäß Anspruch 1, 2. Method according to claim 1,
mit den Schritten:  with the steps:
e) Erhöhen des Massenstroms des in die Gasturbine (2) eingeleiteten Brennstoffs derart, dass die Drehzahl der Einwellenanlage (1) eine Gasturbinengrenzwertdrehzahl erreicht, die höher als die Dampfturbinengrenzwertdrehzahl ist, wobei die Überdrehzahlschutzeinrichtung derart eingerichtet ist, dass ein zweiter Überdrehzahlschutz ausgelöst wird, sobald die Drehzahl der Einwellenanlage (1) die Gasturbinengrenzwertdrehzahl erreicht ;  e) increasing the mass flow of the fuel introduced into the gas turbine (2) such that the speed of the single-shaft system (1) reaches a gas turbine limit speed higher than the steam turbine limit speed, the overspeed protection device being arranged to initiate a second overspeed protection as soon as possible the speed of the single-shaft system (1) reaches the gas turbine limit speed;
f) Prüfen, ob der zweite Überdrehzahlschutz ausgelöst wird.  f) Check if the second overspeed protection is triggered.
3. Verfahren gemäß Anspruch 1 oder 2 , 3. The method according to claim 1 or 2,
mit dem Schritt:  with the step:
a) Evakuieren der Dampfturbine (3) .  a) evacuating the steam turbine (3).
4. Verfahren gemäß einem der Ansprüche 1 bis 3, 4. The method according to any one of claims 1 to 3,
wobei die Einwellenanlage (1) einen Generator (4) aufweist, an dem keine elektrische Last angeschlossen ist.  wherein the single-shaft system (1) has a generator (4) to which no electrical load is connected.
EP14771808.4A 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant Not-in-force EP3022402B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14771808.4A EP3022402B1 (en) 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant
PL14771808T PL3022402T3 (en) 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13184814.5A EP2848771A1 (en) 2013-09-17 2013-09-17 Method for testing an overspeed protection system of a single-shaft system
EP14771808.4A EP3022402B1 (en) 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant
PCT/EP2014/069068 WO2015039908A2 (en) 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant

Publications (2)

Publication Number Publication Date
EP3022402A2 true EP3022402A2 (en) 2016-05-25
EP3022402B1 EP3022402B1 (en) 2017-08-16

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EP13184814.5A Withdrawn EP2848771A1 (en) 2013-09-17 2013-09-17 Method for testing an overspeed protection system of a single-shaft system
EP14771808.4A Not-in-force EP3022402B1 (en) 2013-09-17 2014-09-08 Method for testing an overspeed protection device of a single-shaft plant

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KR (1) KR101834098B1 (en)
PL (1) PL3022402T3 (en)
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CN112664284A (en) * 2020-12-24 2021-04-16 上海电气电站设备有限公司 Protection system and protection method based on operation of steam turbine

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US5301499A (en) * 1990-06-28 1994-04-12 General Electric Company Overspeed anticipation and control system for single shaft combined cycle gas and steam turbine unit
JP3930462B2 (en) * 2003-08-01 2007-06-13 株式会社日立製作所 Single-shaft combined cycle power generation facility and operation method thereof
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
FR2962165B1 (en) * 2010-07-02 2014-05-02 Turbomeca DETECTION OF OVERSPEED OF FREE TURBINE BY MEASUREMENT ON COUPLER

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CN112664284A (en) * 2020-12-24 2021-04-16 上海电气电站设备有限公司 Protection system and protection method based on operation of steam turbine

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KR101834098B1 (en) 2018-03-02
KR20160042448A (en) 2016-04-19
WO2015039908A2 (en) 2015-03-26
EP3022402B1 (en) 2017-08-16
WO2015039908A3 (en) 2015-05-28
EP2848771A1 (en) 2015-03-18
PL3022402T3 (en) 2018-01-31

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