EP2276935B1 - Control device and method for a quick-acting gate valve of a steam turbine - Google Patents

Control device and method for a quick-acting gate valve of a steam turbine Download PDF

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Publication number
EP2276935B1
EP2276935B1 EP20090749621 EP09749621A EP2276935B1 EP 2276935 B1 EP2276935 B1 EP 2276935B1 EP 20090749621 EP20090749621 EP 20090749621 EP 09749621 A EP09749621 A EP 09749621A EP 2276935 B1 EP2276935 B1 EP 2276935B1
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EP
European Patent Office
Prior art keywords
valve
quick
control
relief valve
control valve
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
EP20090749621
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German (de)
French (fr)
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EP2276935A1 (en
Inventor
Christian Potten
Holger Hennecke
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MAN Energy Solutions SE
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MAN Diesel and Turbo SE
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Publication date
Application filed by MAN Diesel and Turbo SE filed Critical MAN Diesel and Turbo SE
Priority to PL09749621T priority Critical patent/PL2276935T3/en
Publication of EP2276935A1 publication Critical patent/EP2276935A1/en
Application granted granted Critical
Publication of EP2276935B1 publication Critical patent/EP2276935B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31552—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line
    • F15B2211/31558—Directional control characterised by the connections of the valve or valves in the circuit being connected to an output member and a return line having a single output member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves

Definitions

  • the invention relates to a control device for a quick-acting valve of a steam turbine with a relief valve for closing the quick-closing valve and a switched in a 2-of-3 selection relief valve control valve assembly according to the preamble of claim 1, a quick-closing valve for a steam turbine with such a control device and a Method for carrying out a partial stroke test of such a quick-closing valve.
  • a quick-acting valve has a working cylinder which is vented by a hydraulic pressure against a biasing element, such as a spring, thus actively opening the quick-acting valve as long as the hydraulic pressure overcomes the bias of the biasing element.
  • a biasing element such as a spring
  • the DE 10 2004 042 891 B3 proposes for this purpose a control device according to the preamble of claim 1 with a cartridge valve for reducing the quick-release valve opening hydraulic pressure and a cartridge valve actuated this relief valve control valve assembly having three solenoid valves, which in a so-called 2-of-3 selection ("2v3 "-Selection), ie, are hydraulically connected to the relief valve, that this closes the quick-closing valve until at least two of the three valves of the relief valve control valve assembly are switched to a quick-closing position.
  • 2-of-3 selection so-called 2-of-3 selection
  • the DE 2 254 250 A proposes a 2v3 selection for the monitoring channels of a controller for a steam turbine trip valve to increase the reliability of the monitoring.
  • Object of the present invention is therefore to improve the availability, safety and reliability of a quick-closing valve for a steam turbine.
  • a control device for a quick-acting valve of a steam turbine according to the preamble of claim 1 is further developed by its characterizing features.
  • Claim 14 provides a quick-acting valve with such a control device, claim 15, a process executable by such a control device under protection.
  • a control device for a quick-acting valve of a steam turbine has a relief valve for reducing a hydraulic pressure which opens the quick-acting valve.
  • the quick-acting valve can, as explained above, in particular have a hydraulically actuable working cylinder, which can be moved by an appropriate hydraulic pressure against a biasing element, such as a tension or compression spring in an open position is and with sufficient reduction of the hydraulic pressure, the quick-closing valve closes.
  • This reduction of the hydraulic pressure and thus the closing of the quick-closing valve can be done via the relief valve, which may include, for example, one or more Cartdrige and / or ball valves.
  • a relief valve control valve assembly which has three or more valves which are hydraulically connected to the relief valve, that the relief valve closes the quick-closing valve only if at least two valves of the relief valve control valve assembly are switched to a quick-closing position , ie realize a 2v3 selection.
  • test control valve arrangement which is preferably formed independently of the relief valve control valve arrangement, and by means of which the hydraulic pressure which opens the quick-action valve against the biasing element can be reduced and increased.
  • a test, in particular a so-called partial stroke test of the quick-closing valve can thus be carried out even when the relief valve is closed by first reducing the hydraulic pressure such that the quick-acting valve is completely removed, for example, starting from the quick-acting valve which is opened, for example, completely or in an operating standard position or at least partially closes, for example, by the working cylinder performs a full or a partial stroke. Subsequently, the hydraulic pressure is increased again and the quick-closing valve is returned to its original position.
  • the function of the quick-acting valve can be checked independently of the relief valve control valve arrangement and thus, for example, a binding or sticking, for example by scaling, can be detected.
  • the check-control valve assembly also provides a redundant, independent of the relief valve option to reduce the hydraulic pressure and so close the quick-closing valve, although possibly slower than through the relief valve.
  • Both the relief valve and the check control valve assembly are controlled so that hydraulic pressure is reduced over both and so the quick-closing valve is closed even faster.
  • the check control valve assembly on one or more first control valves and / or one or more second control valves.
  • a pressure source such as a hydraulic accumulator, a pump or the like
  • the connection of the relief valve with a pressure sink for example one or more tanks, can be done via the first and / or second control valves
  • First and second control valves may be connected in parallel or in series, wherein in the connection to the pressure source and / or to the quick-acting valve, a preferably adjustable throttle may be connected upstream to reduce the pressure applied to the test control valve assembly hydraulic pressure to a suitable value.
  • the relief valve control valve assembly and the check control valve assembly preferably form a structural unit.
  • these two subunits can form a compact block and be attached to each other and / or a carrier. This facilitates the installation of the complete control device and reduces the required space.
  • Valves of the relief valve control valve assembly and / or the check control valve arrangement are preferably designed as 4/2-way solenoid valve, ie valves with four terminals, which are switched over, preferably acting against a biasing element, electromagnets in two positions.
  • Valves of the relief valve control valve arrangement preferably connect the relief valve to a pressure sink or separate it from a pressure source when they are not supplied with energy, ie open the relief valve when de-energized.
  • a first and / or second control valves of the check control valve assembly connect the quick-acting valve to the pressure sink while disconnecting it from the pressure source when energized, ie close the quick-acting valve when energized.
  • the relief valve control valve assembly and / or the check control valve assembly preferably includes end position monitoring to determine if the valves are operating properly, i.e. take the controlled end position (open or closed position).
  • the controller includes a relief valve controller for sensing the speed of the steam turbine and switching the relief valve control valve assembly to the quick-closing position.
  • This relief valve control advantageously comprises at least three rotational speed detection units which are connected in such a way that the relief valve control valve arrangement is only switched to a quick-closing position if at least two rotational speed detection units detect a rotational speed of the steam turbine which exceeds a predetermined threshold value, i.e. realize a 2v3 selection.
  • the speed detection units may have a synchronization monitoring for mutual comparison of the detected speeds, a zero speed monitoring and / or an underspeed monitoring.
  • the speed detection units preferably communicate with each other via a bus capable of realizing the logic constituting the 2v3 selection.
  • external quick-closing commands so-called external trips, can be entered into the relief valve control, for example, from a performance monitoring of the turbine, a clutch monitoring or the like and as well as exceeding the predetermined threshold by at least two detected speeds for switching the relief valve control valve assembly in the Lead to quick-closing position.
  • the speed detection units may each have one or more speed detection devices, such as active speed sensors, and be physically independently connected to these and / or valves of the relief valve control valve assembly to increase reliability and safety.
  • speed detection devices such as active speed sensors
  • a test generator For test driving the valves of the relief valve control valve assembly and / or for test driving the test control valve assembly, the relief valve control, a test generator exhibit.
  • the test-wise activation of the relief valve control valve arrangement and the test control valve arrangement can be controlled by a common test generator, but equally individual partial test generators may be provided which may preferably be implemented in the relief valve control or implemented separately from it.
  • the actuation of the valves of the relief valve control valve arrangement is preferably carried out such that the valves of the relief valve control valve assembly are alternately, in particular cyclically, individually switched to test mode in the SchneliBank position. Since with only one switched in the quick-closing position valve of the relief valve control valve assembly due to the 2v3 selection, the relief valve does not close the quick-closing valve, this test, for example, periodically, even during operation of the turbine.
  • the control of the test control valve arrangement is preferably carried out in such a way that the test control valve arrangement reduces the hydraulic pressure opening the quick-closing valve when the relief valve is closed and subsequently increases again so as to carry out a full or partial stroke test.
  • a partial stroke test can also be carried out during operation of the turbine, preferably before and / or after.
  • one or more sensors are preferably provided, which detect an adjustment of the quick-acting valve, for example a stroke of a working cylinder.
  • at least two sensors are provided at the same lifting height in order to distinguish between sensor failure, characterized by only one sensor signal, and faulty stroke, characterized by signals of all sensors
  • the test generator can be parameterizable in order to be able to set test conditions, for example the time duration between two tests, the partial lift height or the like.
  • the test generator performs the test of the quick-closing valve by controlling the test control valve assembly and / or the test of the relief valve control valve assembly automatically, for example, after a predetermined number of operating hours, a predetermined number of other tests or like that.
  • he may have an operating hours counter and / or a start counter.
  • Fig. 1 shows in the form of a hydraulic and information plan partially schematically a control device for a quick-closing valve of a steam turbine according to an embodiment of the present invention.
  • the speed of a rotor 1 of a steam turbine is detected by three independent speed sensors 17.1 to 17.3. If a speed detected by a sensor 17 exceeds a predetermined threshold value, a speed detection unit 10, 20 or 30 connected to it supplies a switching command to a 4/2-way solenoid valve in a relief valve control valve arrangement 6 via a control line 10.2, 20.2 or 30.3.
  • a quick-acting valve 2 opens the cartridge valve 4, its working piston 2.1 extends under the force of a prestressed disc spring 2.2 (down in Fig. 1 ), thereby hydraulic fluid from the working space 2.3 via passages 3, 3.1, the open Valve 4, passages 15.21, 15.22 in the tank 16 and thereby closes the quick-closing valve such that a steam supply to the steam turbine is interrupted and thus exceeding a maximum permissible speed of the rotor 1 is prevented.
  • a test generator 40 cyclically drives the individual speed detection units 10, 20 and 30 to alternately switch the associated solenoid valve of the relief valve control valve assembly 6 to the quick-release position. Via information lines 10.1, 20.1 or 30.1, end position sensors in these magnets (not shown) report whether the respective valve is functioning properly.
  • the test generator 40 controls two further control valves in the form of 4/2-way valves 8, 9 via control lines 40.3, 40.5 in such a way that, starting from the in Fig. 1 shown operating position, the control valves are switched 8.9 the test control valve assembly simultaneously and the working space 2.3 via the passages 3, 3.2 (ie, bypassing the relief valve 4), 3.21, a check valve 11, an adjustable throttle 13, the now energized control valves 8,9 and the passages 15, 15.2, 15.22 connects to the tank 16.
  • the working piston 2.1 performs a partial stroke (down in Fig. 1 ), which is detected by sensors 40.1, 40.2 and transmitted to the test generator.
  • the first control valve 8 and the second control valve 9 of the test control valve assembly are again in the in Fig. 1 shown operating position, so that the pressure source P via passages 7, 7.1, an adjustable throttle 14, the first and second control valve 8, 9, a check valve 12 and the passages 3.22, 3.2, 3 is connected to the working space 2.3, so that increases the hydraulic pressure in this, the working piston 2.1 against the bias of the plate spring drives 2.2 and so the quick-release valve opens again until the test generator 40 via the sensors 40.1, 40.2, determines that the partial lift was reversed.
  • the end positions of the first control valve 8 and the second control valve 9 are monitored via end position sensors and reported via information lines 40.4, 40.6 to the test generator.
  • the relief valve control valve assembly 6 and the check control valve assembly 8, 9 are combined as a structural unit in a compact block.
  • the 2v3 valve block 6, 8, 9 can also be designed in explosion-proof design.
  • Both sub-units discharge valve control valve assembly 6 and test control valve assembly 8, 9 are controlled by the speed detection units 10, 20, 30 and the test generator 40, which may be combined to form an overspeed detection system 50.
  • the overspeed detection system 50 may include further relay assemblies (not shown), in particular for the realization of dual circuits in 2v3 structure for switching off further consumers.
  • Trip / trip messages or commands are compared in a 2v3 selection, and the majority message is output in triplicate in a fail-safe relay circuit with positively driven contacts (not shown).
  • one or more of the speed detection units 10, 20, 30 includes encoder circuit monitoring, encoder signal monitoring, encoder signal relay, overspeed limit, underspeed threshold, zero speed indication with relay output, external trip control inputs Release, trip-line monitoring or 2v3 solenoid valve monitoring, a fault message and / or a direction of rotation detection.
  • each speed detection unit 10, 20, 30 On the front panel of one or more speed detection units 10, 20, 30 is a keypad (not shown) for operation and parameterization, a five-digit display for displaying the current speed and error message display and four LEDs for status display.
  • a keypad for operation and parameterization
  • a five-digit display for displaying the current speed and error message display
  • four LEDs for status display.
  • each speed detection unit 10, 20, 30 has a front-side Profibus-DP interface (not shown).
  • the test generator 40 is equipped with automatic over-speed cyclic check routines, 2v3 logic of the 2v3 valve manifold and the partial stroke test.
  • On the housing front of the generator is a keypad for parameterization, a display for displaying the test speed, LEDs for displaying the status and a Profibus interface for data exchange with a Profibus master (not shown).
  • a trip or quick circuit can be stored in a fail-safe control.
  • a trip reset can be realized in this fail-safe control.
  • the system preferably automatically enters the GOOD state when there is no internal or external trip condition. For the execution of the overspeed protection a fail-safe control is advantageous.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Control Of Turbines (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A control device for a quick-closing valve of a steam turbine including a relief valve for reducing a hydraulic pressure opening the quick-closing valve, and a relief valve control valve arrangement having at least three valves which are hydraulically interconnected with the relief valve in such a way that the relief valve does not close the quick-closing valve unless at least two valves of the relief valve control valve arrangement are switched to a quick-closing position. The system includes a test control valve arrangement for selectively reducing and increasing the hydraulic pressure opening the quick-closing valve when the relief valve is closed.

Description

Die Erfindung betrifft eine Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine mit einem Entlastungsventil zum Schließen des Schnellschlussventils und einer in einer 2-von-3-Auswahl geschalteten Entlastungsventil-Steuerventilanordnung nach dem Oberbegriff des Anspruchs 1, ein Schnellschlussventil für eine Dampfturbine mit einer solchen Steuereinrichtung sowie ein Verfahren zur Durchführung eines Teilhubtests eines solchen Schnellschlussventils.The invention relates to a control device for a quick-acting valve of a steam turbine with a relief valve for closing the quick-closing valve and a switched in a 2-of-3 selection relief valve control valve assembly according to the preamble of claim 1, a quick-closing valve for a steam turbine with such a control device and a Method for carrying out a partial stroke test of such a quick-closing valve.

Dampfturbinen, beispielsweise in Kraftwerken, in denen Frischdampf aus einem Heizkessel entspannt wird und dabei eine oder mehrere Turbinenstufen antreibt, dürfen bestimmte Höchstdrehzahlen nicht überschreiten, um insbesondere Schädigungen der Turbinenkomponenten zu verhindern. Um bei einem Lastabwurf, einem Kupplungsbruch oder dergleichen ein Überschreiten dieser Höchstdrehzahl durch die Turbine zu vermeiden, ist es beispielsweise aus der DE 10 2004 042 891 B3 bekannt, ein Schnellschlussventil vorzusehen, das in möglichst kurzer Zeit den Dampfmassenstrom zur Turbine unterbricht oder reduziert, wenn beispielsweise die Turbinendrehzahl einen vorgegebenen Schwellwert übersteigt oder auf andere Weise ein drohendes Überschreiten der Höchstdrehzahl erkannt wird.Steam turbines, for example in power plants, in which live steam is expanded from a boiler and thereby drives one or more turbine stages, must not exceed certain maximum speeds, in particular to prevent damage to the turbine components. To avoid in a load shedding, a clutch breakage or the like exceeding this maximum speed by the turbine, it is for example from the DE 10 2004 042 891 B3 It is known to provide a quick-acting valve which interrupts or reduces the steam mass flow to the turbine in the shortest possible time if, for example, the turbine speed exceeds a predetermined threshold value or if a threatening exceeding of the maximum speed is detected in another way.

An solche Schnellschlussventile und deren Aktuierung werden dementsprechend hohe Verfügbarkeits-, Sicherheits-und Zuverlässigkeitsanforderungen gestellt. Üblicherweise weist ein Schnellschlussventil daher einen Arbeitszylinder auf, der durch einen Hydraulikdruck gegen ein Vorspannelement, beispielsweise eine Feder, gelüftet wird und so das Schnellschlussventil aktiv öffnet, solange der Hydraulikdruck die Vorspannung des Vorspannelements überwindet. Zum Schließen des Schnellschlussventils wird dieser Hydraulikdruck möglichst rasch reduziert, beispielsweise in einen Tank abgesteuert. Der drucklose Arbeitszylinder wird durch das Vorspannelement in die Geschlossen-Stellung des Schnellschlussventils gezwungen.Accordingly, high availability, safety and reliability requirements are placed on such quick-closing valves and their actuation. Typically, therefore, a quick-acting valve has a working cylinder which is vented by a hydraulic pressure against a biasing element, such as a spring, thus actively opening the quick-acting valve as long as the hydraulic pressure overcomes the bias of the biasing element. To close the quick-closing valve, this hydraulic pressure is reduced as quickly as possible, for example, diverted into a tank. The non-pressurized working cylinder is forced by the biasing member in the closed position of the quick-closing valve.

Die DE 10 2004 042 891 B3 schlägt hierzu eine Steuereinrichtung nach dem Oberbegriff des Anspruchs 1 mit einem Cartridgeventil zur Reduzierung des das Schnellschlussventil öffnenden Hydraulikdruckes und einer dieses Cartridgeventil aktuierenden Entlastungsventil-Steuerventilanordnung vor, die drei Magnetventile, aufweist, welche in einer sogenannten 2-von-3-Auswahl ("2v3"-Auswahl) realisieren, i.e. derart mit dem Entlastungsventil hydraulisch verschaltet sind, dass dieses das Schnellschlussventil erst schließt, falls wenigstens zwei der drei Ventile der Entlastungsventil-Steuerventilanordnung in eine Schnellschluss-Stellung geschaltet werden. Auf diese Weise können vorteilhaft unnötige Schnellschlüsse aufgrund eines einzelnen defekten Ventils der Entlastungsventil-Steuerventilanordnung vermieden und andererseits diese Ventile während des Betriebs einzeln getestet werden.The DE 10 2004 042 891 B3 proposes for this purpose a control device according to the preamble of claim 1 with a cartridge valve for reducing the quick-release valve opening hydraulic pressure and a cartridge valve actuated this relief valve control valve assembly having three solenoid valves, which in a so-called 2-of-3 selection ("2v3 "-Selection), ie, are hydraulically connected to the relief valve, that this closes the quick-closing valve until at least two of the three valves of the relief valve control valve assembly are switched to a quick-closing position. In this way, it is advantageously possible to avoid unnecessary fast shutdowns due to a single defective valve of the relief valve control valve arrangement and, on the other hand, to test these valves individually during operation.

Die DE 2 254 250 A schlägt eine 2v3-Auswahl bezüglich der Überwachungskanäle einer Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine vor, um die Zuverlässigkeit der Überwachung zu erhöhen.The DE 2 254 250 A proposes a 2v3 selection for the monitoring channels of a controller for a steam turbine trip valve to increase the reliability of the monitoring.

Nachteilig sind bei diesen Steuereinrichtungen die Möglichkeiten zur Überprüfung bzw. zum Test der auslösenden Aktorik und des Schnellschlussventils eingeschränkt.Disadvantageous in these control devices are the possibilities for checking or for testing the triggering actuator system and the quick-closing valve.

Aufgabe der vorliegenden Erfindung ist es daher, die Verfügbarkeit, Sicherheit und Zuverlässigkeit eines Schnellschlussventils für eine Dampfturbine zu verbessern.Object of the present invention is therefore to improve the availability, safety and reliability of a quick-closing valve for a steam turbine.

Zur Lösung dieser Aufgabe ist eine Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine nach dem Oberbegriff des Anspruchs 1 durch dessen kennzeichnende Merkmale weitergebildet. Anspruch 14 stellt ein Schnellschlussventil mit einer solchen Steuereinrichtung, Anspruch 15 ein durch eine solche Steuereinrichtung ausführbares Verfahren unter Schutz. Vorteilhafte Weiterbildungen sind Gegenstand der Unteransprüche.To solve this problem, a control device for a quick-acting valve of a steam turbine according to the preamble of claim 1 is further developed by its characterizing features. Claim 14 provides a quick-acting valve with such a control device, claim 15, a process executable by such a control device under protection. Advantageous developments are the subject of the dependent claims.

Eine erfindungsgemäße Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine weist ein Entlastungsventil zur Reduzierung eines das Schnellschlussventil öffnenden Hydraulikdruckes auf. Das Schnellschlussventil kann, wie vorstehend erläutert, insbesondere einen hydraulisch betätigbaren Arbeitszylinder aufweisen, der durch entsprechenden Hydraulikdruck aktiv gegen ein Vorspannelement, beispielsweise eine Zug-oder Druckfeder in eine Offen-Stellung bewegbar ist und bei ausreichender Reduzierung des Hydraulikdruckes das Schnellschlussventil verschließt. Diese Reduzierung des Hydraulikdrucks und damit das Schließen des Schnellschlussventils kann über das Entlastungsventil erfolgen, das beispielsweise ein oder mehrere Cartdrige-und/oder Kugelventile umfassen kann.A control device according to the invention for a quick-acting valve of a steam turbine has a relief valve for reducing a hydraulic pressure which opens the quick-acting valve. The quick-acting valve can, as explained above, in particular have a hydraulically actuable working cylinder, which can be moved by an appropriate hydraulic pressure against a biasing element, such as a tension or compression spring in an open position is and with sufficient reduction of the hydraulic pressure, the quick-closing valve closes. This reduction of the hydraulic pressure and thus the closing of the quick-closing valve can be done via the relief valve, which may include, for example, one or more Cartdrige and / or ball valves.

Zur Ansteuerung dieses Entlastungsventil ist eine Entlastungsventil-Steuerventilanordnung vorgesehen, die drei oder mehr Ventile aufweist, welche derart mit dem Entlastungsventil hydraulisch verschaltet sind, dass das Entlastungsventil das Schnellschlussventil erst schließt, falls wenigstens zwei Ventile der Entlastungsventil-Steuerventilanordnung in eine Schnellschluss-Stellung geschaltet sind, i.e. eine 2v3-Auswahl realisieren.To control this relief valve, a relief valve control valve assembly is provided which has three or more valves which are hydraulically connected to the relief valve, that the relief valve closes the quick-closing valve only if at least two valves of the relief valve control valve assembly are switched to a quick-closing position , ie realize a 2v3 selection.

Erfindungsgemäß ist nun zusätzlich eine Prüf-Steuerventilanordnung vorgesehen, die bevorzugt unabhängig von der Entlastungsventil-Steuerventilanordnung ausgebildet ist, und durch die der Hydraulikdruck, der das Schnellschlussventil gegen das Vorspannelement öffnet, reduziert und erhöht werden kann.According to the invention, a test control valve arrangement is now additionally provided, which is preferably formed independently of the relief valve control valve arrangement, and by means of which the hydraulic pressure which opens the quick-action valve against the biasing element can be reduced and increased.

Durch diese zusätzliche Prüf-Steuerventilanordnung kann damit auch bei geschlossenem Entlastungsventil ein Test, insbesondere ein sogenannter Teilhubtest des Schnellschlussventils durchgeführt werden, indem, ausgehend von dem beispielsweise vollständig oder in eine Betriebsnormalstellung geöffnetem Schnellschlussventil, zunächst der Hydraulikdruck derart reduziert wird, dass das Schnellschlussventil sich ganz oder wenigstens teilweise schließt, indem beispielsweise der Arbeitszylinder einen vollen bzw. einen Teilhub ausführt. Anschließend wird der Hydraulikdruck wieder erhöht und das Schnellschlussventil so in seine Ausgangsstellung zurückgefahren.As a result of this additional test control valve arrangement, a test, in particular a so-called partial stroke test of the quick-closing valve, can thus be carried out even when the relief valve is closed by first reducing the hydraulic pressure such that the quick-acting valve is completely removed, for example, starting from the quick-acting valve which is opened, for example, completely or in an operating standard position or at least partially closes, for example, by the working cylinder performs a full or a partial stroke. Subsequently, the hydraulic pressure is increased again and the quick-closing valve is returned to its original position.

Durch diesen Test, der vor, während und/oder nach dem Arbeitsbetrieb der Turbine durchgeführt werden kann, kann unabhängig von der Entlastungsventil-Steuerventilanordnung die Funktion des Schnellschlussventils überprüft und so beispielsweise eine Schwergängigkeit oder ein Festsitzen, etwa durch Verzunderung, erkannt werden. In einer bevorzugten Weiterbildung stellt die Prüf-Steuerventilanordnung zudem eine redundante, von dem Entlastungsventil unabhängige Möglichkeit dar, den Hydraulikdruck zu reduzieren und so das Schnellschlussventil zu schließen, wenngleich gegebenenfalls langsamer als durch das Entlastungsventil. Vorteilhafterweise können im Falle eines Schnellschlusses auch sowohl das Entlastungsventil als auch die Prüf-Steuerventilanordnung so angesteuert werden, dass Hydraulikdruck über beide abgesteuert und so das Schnellschlussventil noch rascher geschlossen wird.Through this test, which can be carried out before, during and / or after the working operation of the turbine, the function of the quick-acting valve can be checked independently of the relief valve control valve arrangement and thus, for example, a binding or sticking, for example by scaling, can be detected. In a preferred embodiment, the check-control valve assembly also provides a redundant, independent of the relief valve option to reduce the hydraulic pressure and so close the quick-closing valve, although possibly slower than through the relief valve. Advantageously, in the case of a quick closure also Both the relief valve and the check control valve assembly are controlled so that hydraulic pressure is reduced over both and so the quick-closing valve is closed even faster.

Bevorzugt weist die Prüf-Steuerventilanordnung ein oder mehrere erste Steuerventile und/oder ein oder mehrere zweite Steuerventile auf. Sowohl die Verbindung des Entlastungsventils mit einer Druckquelle, beispielsweise einem Hydraulikdruckspeicher, einer Pumpe oder dergleichen, als auch die Verbindung des Entlastungsventils mit einer Drucksenke, beispielsweise einem oder mehreren Tanks, kann über die ersten und/oder zweiten Steuerventile erfolgenPreferably, the check control valve assembly on one or more first control valves and / or one or more second control valves. Both the connection of the relief valve with a pressure source, such as a hydraulic accumulator, a pump or the like, as well as the connection of the relief valve with a pressure sink, for example one or more tanks, can be done via the first and / or second control valves

Erste und zweite Steuerventile können parallel oder in Reihe geschaltet sein, wobei ihnen in der Verbindung zur Druckquelle und/oder zu dem Schnellschlussventil eine, vorzugsweise einstellbare, Drossel vorgeschaltet sein kann, um den die Prüf-Steuerventilanordnung beaufschlagenden Hydraulikdruck auf einen geeigneten Wert zu reduzieren.First and second control valves may be connected in parallel or in series, wherein in the connection to the pressure source and / or to the quick-acting valve, a preferably adjustable throttle may be connected upstream to reduce the pressure applied to the test control valve assembly hydraulic pressure to a suitable value.

Die Entlastungsventil-Steuerventilanordnung und die Prüf-Steuerventilanordnung bilden bevorzugt eine bauliche Einheit. Insbesondere können diese beiden Teileinheiten einen kompakten Block bilden und aneinander und/oder einem Träger befestigt sein. Dies erleichtert die Montage der kompletten Steuereinrichtung und reduziert den erforderlichen Bauraum.The relief valve control valve assembly and the check control valve assembly preferably form a structural unit. In particular, these two subunits can form a compact block and be attached to each other and / or a carrier. This facilitates the installation of the complete control device and reduces the required space.

Ventile der Entlastungsventil-Steuerventilanordnung und/oder der Prüf-Steuerventilanordnung sind bevorzugt als 4/2-Magnet-Wegeventil ausgebildet, i.e. Ventile mit vier Anschlüssen, die über, vorzugsweise gegen ein Vorspannelement wirkende, Elektromagnete in zwei Stellungen schaltbar sind. Bevorzugt verbinden dabei Ventile der Entlastungsventil-Steuerventilanordnung das Entlastungsventil mit einer Drucksenke bzw. trennen es von einer Druckquelle, wenn sie nicht mit Energie versorgt sind, d.h. öffnen im stromlosen Zustand das Entlastungsventil. In gleicher Weise verbinden bevorzugt ein erstes und/oder zweites Steuerventile der Prüf-Steuerventilanordnung das Schnellschlussventil mit der Drucksenke, während sie es von der Druckquelle trennen, wenn sie mit Energie versorgt sind, d.h. schließen im bestromten Zustand das Schnellschlussventil. Es ist jedoch auch die umgekehrte Stromlos-Stellung möglich.Valves of the relief valve control valve assembly and / or the check control valve arrangement are preferably designed as 4/2-way solenoid valve, ie valves with four terminals, which are switched over, preferably acting against a biasing element, electromagnets in two positions. Valves of the relief valve control valve arrangement preferably connect the relief valve to a pressure sink or separate it from a pressure source when they are not supplied with energy, ie open the relief valve when de-energized. Similarly, preferably a first and / or second control valves of the check control valve assembly connect the quick-acting valve to the pressure sink while disconnecting it from the pressure source when energized, ie close the quick-acting valve when energized. However, it is also the reverse powerless position possible.

Die Entlastungsventil-Steuerventilanordnung und/oder die Prüf-Steuerventilanordnung weisen bevorzugt eine Endlagenüberwachung auf, um festzustellen, ob die Ventile ordnungsgemäß arbeiten, i.e. die angesteuerte Endlage (Offen-bzw. Geschlossen-Stellung) einnehmen.The relief valve control valve assembly and / or the check control valve assembly preferably includes end position monitoring to determine if the valves are operating properly, i.e. take the controlled end position (open or closed position).

In einer bevorzugten Ausführung der vorliegenden Erfindung weist die Steuereinrichtung eine Entlastungsventilsteuerung zum Erfassen der Drehzahl der Dampfturbine und Schalten der Entlastungsventil-Steuerventilanordnung in die Schnellschluss-Stellung auf. Diese Entlastungsventilsteuerung umfasst vorteilhafterweise wenigstens drei Drehzahlerfassungseinheiten, die derart verschaltet sind, dass die Entlastungsventil-Steuerventilanordnung erst in eine Schnellschluss-Stellung geschaltet wird, falls wenigstens zwei Drehzahlerfassungseinheiten eine Drehzahl der Dampfturbine erfassen, die einen vorgegebenen Schwellwert übersteigt, i.e. realisieren eine 2v3-Auswahl.In a preferred embodiment of the present invention, the controller includes a relief valve controller for sensing the speed of the steam turbine and switching the relief valve control valve assembly to the quick-closing position. This relief valve control advantageously comprises at least three rotational speed detection units which are connected in such a way that the relief valve control valve arrangement is only switched to a quick-closing position if at least two rotational speed detection units detect a rotational speed of the steam turbine which exceeds a predetermined threshold value, i.e. realize a 2v3 selection.

Dabei können die Drehzahlerfassungseinheiten eine Gleichlaufüberwachung zur gegenseitigen Vergleichen der erfassten Drehzahlen, eine Nulldrehzahlüberwachung und/oder eine Unterdrehzahlüberwachung aufweisen. Die Drehzahlerfassungseinheiten kommunizieren bevorzugt über einen Bus miteinander, der die die 2v3-Auswahl bildende Logik realisieren kann. Bevorzugt können auch externe Schnellschlussbefehle, sogenannte externe Trips, in die Entlastungsventilsteuerung eingegeben werden, die beispielsweise von einer Leistungsüberwachung der Turbine, einer Kupplungsüberwachung oder dergleichen stammen und ebenso wie die Überschreitung des vorgegebenen Schwellwertes durch wenigstens zwei erfasste Drehzahlen zur Schaltung der Entlastungsventil-Steuerventilanordnung in die Schnellschluss-Stellung führen.The speed detection units may have a synchronization monitoring for mutual comparison of the detected speeds, a zero speed monitoring and / or an underspeed monitoring. The speed detection units preferably communicate with each other via a bus capable of realizing the logic constituting the 2v3 selection. Preferably, external quick-closing commands, so-called external trips, can be entered into the relief valve control, for example, from a performance monitoring of the turbine, a clutch monitoring or the like and as well as exceeding the predetermined threshold by at least two detected speeds for switching the relief valve control valve assembly in the Lead to quick-closing position.

Die Drehzahlerfassungseinheiten können dabei jeweils eine oder mehrere Drehzahlerfassungseinrichtungen, beispielsweise aktive Drehzahlsensoren, aufweisen und mit diesen und/oder Ventilen der Entlastungsventil-Steuerventilanordnung physikalisch unabhängig verbunden sein, um die Zuverlässigkeit und Sicherheit zu erhöhen.The speed detection units may each have one or more speed detection devices, such as active speed sensors, and be physically independently connected to these and / or valves of the relief valve control valve assembly to increase reliability and safety.

Zum testweisen Ansteuern der Ventile der Entlastungsventil-Steuerventilanordnung und/oder zum testweisen Ansteuern der Prüf-Steuerventilanordnung kann die Entlastungsventilsteuerung einen Testgenerator aufweisen. Das testweise Ansteuern der Entlastungsventil-Steuerventilanordnung und der Prüf-Steuerventilanordnung kann dabei durch einen gemeinsamen Testgenerator gesteuert werden, gleichermaßen können jedoch auch jeweils eigene Teil-Testgeneratoren vorgesehen sein, die bevorzugt in der Entlastungsventilsteuerung implementiert oder von dieser getrennt realisiert sein können.For test driving the valves of the relief valve control valve assembly and / or for test driving the test control valve assembly, the relief valve control, a test generator exhibit. In this case, the test-wise activation of the relief valve control valve arrangement and the test control valve arrangement can be controlled by a common test generator, but equally individual partial test generators may be provided which may preferably be implemented in the relief valve control or implemented separately from it.

Die Ansteuerung der Ventile der Entlastungsventil-Steuerventilanordnung erfolgt dabei bevorzugt derart, dass die Ventile der Entlastungsventil-Steuerventilanordnung abwechselnd, insbesondere zyklisch, einzeln testweise in die Schnelischluss-Stellung geschaltet werden. Da bei nur einem in die Schnellschluss-Stellung geschalteten Ventil der Entlastungsventil-Steuerventilanordnung aufgrund der 2v3-Auswahl das Entlastungsventil das Schnellschlussventil noch nicht schließt, kann dieser Test, beispielsweise periodisch, auch während des Betriebs der Turbine erfolgen.The actuation of the valves of the relief valve control valve arrangement is preferably carried out such that the valves of the relief valve control valve assembly are alternately, in particular cyclically, individually switched to test mode in the Schnelischluss position. Since with only one switched in the quick-closing position valve of the relief valve control valve assembly due to the 2v3 selection, the relief valve does not close the quick-closing valve, this test, for example, periodically, even during operation of the turbine.

Die Ansteuerung der Prüf-Steuerventilanordnung erfolgt bevorzugt derart, dass die Prüf-Steuerventilanordnung den das Schnellschlussventil öffnenden Hydraulikdruck bei geschlossenem Entlastungsventil reduziert und anschließend wieder erhöht, um so einen Voll-oder Teilhubtest durchzuführen. Insbesondere ein Teilhubtest kann auch während des Arbeitsbetriebes der Turbine, bevorzugt vor und/oder danach erfolgen. Zur Auswertung des Tests sind bevorzugt ein oder mehrere Sensoren vorgesehen, die eine Verstellung des Schnellschlussventils, beispielsweise einen Hub eines Arbeitszylinders, erfassen. Vorzugsweise sind wenigstens zwei Sensoren auf gleicher Hubhöhe vorgesehen, um zwischen Sensorausfall, gekennzeichnet durch nur ein Sensorsignal, und fehlerhaftem Hub, gekennzeichnet durch Signale aller Sensoren, unterscheiden zu könnenThe control of the test control valve arrangement is preferably carried out in such a way that the test control valve arrangement reduces the hydraulic pressure opening the quick-closing valve when the relief valve is closed and subsequently increases again so as to carry out a full or partial stroke test. In particular, a partial stroke test can also be carried out during operation of the turbine, preferably before and / or after. To evaluate the test, one or more sensors are preferably provided, which detect an adjustment of the quick-acting valve, for example a stroke of a working cylinder. Preferably, at least two sensors are provided at the same lifting height in order to distinguish between sensor failure, characterized by only one sensor signal, and faulty stroke, characterized by signals of all sensors

Der Testgenerator kann parametrierbar sein, um Testbedingungen, beispielsweise die Zeitdauer zwischen zwei Tests, die Teilhubhöhe oder dergleichen einstellen zu können.The test generator can be parameterizable in order to be able to set test conditions, for example the time duration between two tests, the partial lift height or the like.

Bevorzugt führt der Testgenerator den Test des Schnellschlussventils mittels Ansteuerung der Prüf-Steuerventilanordnung und/oder den Test der Entlastungsventil-Steuerventilanordnung automatisch, beispielsweise nach einer vorgegeben Anzahl von Betriebsstunden, einer vorgegebenen Anzahl von anderen Tests oder dergleichen durch. Hierzu kann er einen Betriebsstundenzähler und/oder einen Startzähler aufweisen.Preferably, the test generator performs the test of the quick-closing valve by controlling the test control valve assembly and / or the test of the relief valve control valve assembly automatically, for example, after a predetermined number of operating hours, a predetermined number of other tests or like that. For this purpose, he may have an operating hours counter and / or a start counter.

Weitere Vorteile und Merkmale ergeben sich aus den Unteransprüchen und dem Ausführungsbeispiel. Hierzu zeigt, teilweise schematisiert, die einzige

Fig. 1:
eine Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine nach einer Ausführung der vorliegenden Erfindung.
Further advantages and features emerge from the subclaims and the exemplary embodiment. This shows, partially schematized, the only one
Fig. 1:
a control device for a quick-closing valve of a steam turbine according to an embodiment of the present invention.

Fig. 1 zeigt in Form eines Hydraulik-und Informationsplanes teilweise schematisiert eine Steuereinrichtung für ein Schnellschlussventil einer Dampfturbine nach einer Ausführung der vorliegenden Erfindung. Fig. 1 shows in the form of a hydraulic and information plan partially schematically a control device for a quick-closing valve of a steam turbine according to an embodiment of the present invention.

Die Drehzahl eines Läufers 1 einer Dampfturbine wird durch drei unabhängige Drehzahlsensoren 17.1 bis 17.3 erfasst. Übersteigt eine von einem Sensor 17 erfasste Drehzahl einen vorgegebenen Schwellwert, gibt eine mit diesem verbundene Drehzahlerfassungseinheit 10, 20 bzw. 30 über eine Steuerleitung 10.2, 20.2 bzw. 30.3 einen Schaltbefehl an ein 4/2-Magnetwegeventil in einer Entlastungsventil-Steuerventilanordnung 6.The speed of a rotor 1 of a steam turbine is detected by three independent speed sensors 17.1 to 17.3. If a speed detected by a sensor 17 exceeds a predetermined threshold value, a speed detection unit 10, 20 or 30 connected to it supplies a switching command to a 4/2-way solenoid valve in a relief valve control valve arrangement 6 via a control line 10.2, 20.2 or 30.3.

Diese ist nicht weiter detailliert dargestellt oder beschrieben, da insofern auf die DE 10 2004 042 891 B3 verwiesen werden kann, deren diesbezügliche Offenbarung ausdrücklich zum Gegenstand der vorliegenden Anmeldung gemacht wird. Allgemein sind die drei 4/2-Magnetwegeventil der Entlastungsventil-Steuerventilanordnung 6 hydraulisch so verknüpft, dass sich eine sogenannte "2 von 3"-Auswahl ergibt.This is not shown or described in detail, since insofar on the DE 10 2004 042 891 B3 can be referenced, the relevant disclosure of which is expressly made the subject of the present application. Generally, the three 4/2 solenoid valves of the relief valve control valve assembly 6 are hydraulically linked to give a so-called "2 out of 3" selection.

Sind wenigstens zwei der drei Magnetwegeventil der Entlastungsventil-Steuerventilanordnung 6 durch Steuerbefehle von den Drehzahlerfassungseinheit 10, 20 bzw. 30 nicht in eine Schnellschluss-Stellung geschaltet, ist die Verbindung eines Cartridge-Entlastungsventils 4 über Passagen 5, 7.2 mit einer Druckquelle P getrennt, während das Entlastungsventil 4 über Passagen 5, 15.1, 15.2, 15.22 mit einer Drucksenke 16 kommuniziert.If at least two of the three solenoid valves of the relief valve control valve arrangement 6 are not switched to a quick-closing position by control commands from the rotational speed detection unit 10, 20 or 30, the connection of a cartridge relief valve 4 is separated via passages 5, 7.2 with a pressure source P, while the relief valve 4 via passages 5, 15.1, 15.2, 15.22 communicates with a pressure sink 16.

Dadurch öffnet der Hydraulikdruck in einem Arbeitsraum 2.3 eines Schnellschlussventils 2 das Cartridge-Ventil 4, sein Arbeitskolben 2.1 fährt unter der Kraft einer vorgespannten Tellerfeder 2.2 aus (nach unten in Fig. 1), treibt dabei Hydraulikflüssigkeit aus dem Arbeitsraum 2.3 über Passagen 3, 3.1, das geöffnete Ventil 4, Passagen 15.21, 15.22 in den Tank 16 und schließt dabei das Schnellschlussventil derart, dass eine Dampfzufuhr zur Dampfturbine unterbrochen und so ein Überschreiten einer zulässigen Höchstdrehzahl des Läufers 1 verhindert wird.As a result, the hydraulic pressure in a working chamber 2.3 of a quick-acting valve 2 opens the cartridge valve 4, its working piston 2.1 extends under the force of a prestressed disc spring 2.2 (down in Fig. 1 ), thereby hydraulic fluid from the working space 2.3 via passages 3, 3.1, the open Valve 4, passages 15.21, 15.22 in the tank 16 and thereby closes the quick-closing valve such that a steam supply to the steam turbine is interrupted and thus exceeding a maximum permissible speed of the rotor 1 is prevented.

Zur Überprüfung der Entlastungsventil-Steuerventilanordnung 6 steuert ein Testgenerator 40 zyklisch die einzelnen Drehzahlerfassungseinheiten 10, 20 und 30 derart an, dass sie abwechselnd das zugeordnete Magnetwegeventil der Entlastungsventil-Steuerventilanordnung 6 in die Schnellschluss-Stellung schalten. Über Informationsleitungen 10.1, 20.1 bzw. 30.1 melden Endlagensensoren in diesen Magneten (nicht dargestellt), ob das jeweilige Ventil ordnungsgemäß funktioniert.To test the relief valve control valve assembly 6, a test generator 40 cyclically drives the individual speed detection units 10, 20 and 30 to alternately switch the associated solenoid valve of the relief valve control valve assembly 6 to the quick-release position. Via information lines 10.1, 20.1 or 30.1, end position sensors in these magnets (not shown) report whether the respective valve is functioning properly.

Um einen Teilhubtest durchzuführen, steuert der Testgenerator 40 über Steuerleitungen 40.3, 40.5 zwei weitere Steuerventile in Form von 4/2-Magnetwegeventilen 8, 9 derart an, dass, ausgehend von der in Fig. 1 dargestellten Betriebsstellung, die Steuerventile 8,9 der Prüf-Steuerventilanordnung gleichzeitig umgeschaltet werden und den Arbeitsraum 2.3 über die Passagen 3, 3.2 (i.e. unter Umgehung des Entlastungsventils 4), 3.21, ein Rückschlagventil 11, eine einstellbare Drossel 13, die nun stromführend geschalteten Steuerventile 8,9 und die Passagen 15, 15.2, 15.22 mit dem Tank 16 verbindet. Entsprechend der Ansteuerung des ersten und zweiten Steuerventils 8, 9 bzw. der Einstellung der Drossel 13 reduziert sich so der Hydraulikdruck im Arbeitsraum 2.3, der Arbeitskolben 2.1 führt einen Teilhub aus (nach unten in Fig. 1), der von Sensoren 40.1, 40.2 erfasst und an den Testgenerator übermittelt wird.In order to carry out a partial stroke test, the test generator 40 controls two further control valves in the form of 4/2-way valves 8, 9 via control lines 40.3, 40.5 in such a way that, starting from the in Fig. 1 shown operating position, the control valves are switched 8.9 the test control valve assembly simultaneously and the working space 2.3 via the passages 3, 3.2 (ie, bypassing the relief valve 4), 3.21, a check valve 11, an adjustable throttle 13, the now energized control valves 8,9 and the passages 15, 15.2, 15.22 connects to the tank 16. According to the control of the first and second control valves 8, 9 and the setting of the throttle 13 so reduces the hydraulic pressure in the working space 2.3, the working piston 2.1 performs a partial stroke (down in Fig. 1 ), which is detected by sensors 40.1, 40.2 and transmitted to the test generator.

Nach Erreichen des gewünschten Teilhubes, der die Funktionsfähigkeit des Schnellschlussventils 2 zeigt bzw. durch Aufbrechung von Verzunderungen oder dergleichen wieder herstellt oder verbessert, werden das erste Steuerventil 8 und das zweite Steuerventil 9 der Prüf-Steuerventilanordnung wieder in die in Fig. 1 dargestellte Betriebsstellung geschaltet, so dass die Druckquelle P über Passagen 7, 7.1, eine einstellbare Drossel 14, das erste und zweite Steuerventil 8, 9, ein Rückschlagventil 12 und die Passagen 3.22, 3.2, 3 mit dem Arbeitsraum 2.3 verbunden ist, so dass sich der Hydraulikdruck in diesem erhöht, den Arbeitskolben 2.1 gegen die Vorspannung der Tellerfeder 2.2 treibt und so das Schnellschlussventil wieder öffnet, bis der Testgenerator 40 über die Sensoren 40.1, 40.2, feststellt, dass der Teilhub rückgängig gemacht wurde. Auch die Endlagen des ersten Steuerventils 8 und des zweiten Steuerventils 9 werden über Endlagensensoren überwacht und über Informationsleitungen 40.4, 40.6 an den Testgenerator gemeldet.After reaching the desired partial stroke, which shows the functionality of the quick-closing valve 2 or restores or improves by breaking up of scaling or the like, the first control valve 8 and the second control valve 9 of the test control valve assembly are again in the in Fig. 1 shown operating position, so that the pressure source P via passages 7, 7.1, an adjustable throttle 14, the first and second control valve 8, 9, a check valve 12 and the passages 3.22, 3.2, 3 is connected to the working space 2.3, so that increases the hydraulic pressure in this, the working piston 2.1 against the bias of the plate spring drives 2.2 and so the quick-release valve opens again until the test generator 40 via the sensors 40.1, 40.2, determines that the partial lift was reversed. The end positions of the first control valve 8 and the second control valve 9 are monitored via end position sensors and reported via information lines 40.4, 40.6 to the test generator.

Die Entlastungsventil-Steuerventilanordnung 6 und die Prüf-Steuerventilanordnung 8, 9 sind als bauliche Einheit in einem kompakten Block zusammengefasst. Dabei sind das erste Steuerventil 8 und das zweite Steuerventil 9 mit der vorgeschalteten einstellbaren Drossel 13 in der in Fig. 1 gezeigten Weise in Reihe geschaltet. Sie werden in vorgegebenen Zeitabständen vom Testgenerator 40 zur Durchführung eines Teilhubtestes angesteuert, wie vorstehend beschrieben. Der 2v3-Ventilblock 6, 8, 9 kann auch in Ex-Schutz-Ausführung ausgebildet sein.The relief valve control valve assembly 6 and the check control valve assembly 8, 9 are combined as a structural unit in a compact block. In this case, the first control valve 8 and the second control valve 9 with the upstream adjustable throttle 13 in the in Fig. 1 shown connected in series. They are driven at predetermined intervals by the test generator 40 to perform a Teilhubestes, as described above. The 2v3 valve block 6, 8, 9 can also be designed in explosion-proof design.

Beide Teileinheiten Entlastungsventil-Steuerventilanordnung 6 und Prüf-Steuerventilanordnung 8, 9 werden von den Drehzahlerfassungseinheiten 10, 20, 30 bzw. dem Testgenerator 40 angesteuert, die zu einem Überdrehzahlerfassungssystem 50 zusammengefasst sein können.Both sub-units discharge valve control valve assembly 6 and test control valve assembly 8, 9 are controlled by the speed detection units 10, 20, 30 and the test generator 40, which may be combined to form an overspeed detection system 50.

Das Überdrehzahlerfassungssystem 50 kann weitere Relaisbaugruppen (nicht dargestellt), insbesondere zur Realisierung von Doppelstromkreisen in 2v3-Aufbau zum Abschalten weiterer Verbraucher aufweisen.The overspeed detection system 50 may include further relay assemblies (not shown), in particular for the realization of dual circuits in 2v3 structure for switching off further consumers.

Es ist in 3-kanaliger Redundanz aufgebaut. Trip- bzw. Schnellschlussmeldungen bzw. -befehle werden in einer 2v3-Auswahl verglichen und die mehrheitlich anstehende Meldung wird dreifach in einer ausfallsicheren Relaisschaltung mit zwangsgeführten Kontakten ausgegeben (nicht dargestellt).It is built in 3-channel redundancy. Trip / trip messages or commands are compared in a 2v3 selection, and the majority message is output in triplicate in a fail-safe relay circuit with positively driven contacts (not shown).

Für die Auslösung eines Trips bzw. Schnellschlusses stehen nach außen drei 2v3-Stromkreise zur Verfügung, die bei der Auflösung öffnen. Zusätzlich stehen die vorgenannten weiteren Doppelstromkreise zur Verfügung.Three 2v3 circuits, which open at the resolution, are available to the outside to trigger a trip or quick trip. In addition, the aforementioned additional double circuits are available.

Bevorzugt weisen ein oder mehrere der Drehzahlerfassungseinheiten 10, 20, 30 eine Geber-Stromkreis-Überwachung, eine Geber-Signal-Überwachung, eine Gebersignal-Weiterkopplung, einen Überdrehzahl-Grenzwert, einen Unterdrehzahl-Grenzwert, eine Nulldrehzahlmeldung mit Relaisausgang, Steuereingänge für externe Trip-Auslösung, eine Trip-Line Überwachung bzw. 2v3-Magnetventilüberwachung, eine Störungsmeldung und/oder eine Drehrichtungserkennung auf.Preferably, one or more of the speed detection units 10, 20, 30 includes encoder circuit monitoring, encoder signal monitoring, encoder signal relay, overspeed limit, underspeed threshold, zero speed indication with relay output, external trip control inputs Release, trip-line monitoring or 2v3 solenoid valve monitoring, a fault message and / or a direction of rotation detection.

An der Gerätefront einer oder mehrerer Drehzahlerfassungseinheiten 10, 20, 30 befindet sich ein Tastenfeld (nicht dargestellt) zur Bedienung und Parametrierung, ein fünfstelliges Display zur Anzeige der aktuellen Drehzahl und zur Fehlermeldungsanzeige und vier LEDs zur Statusanzeige. Zum Datenaustausch mit einem Profibus-Master verfügt jede Drehzahlerfassungseinheit 10, 20, 30 über eine frontseitige Profibus-DP-Schnittstelle (nicht dargestellt).On the front panel of one or more speed detection units 10, 20, 30 is a keypad (not shown) for operation and parameterization, a five-digit display for displaying the current speed and error message display and four LEDs for status display. For data exchange with a Profibus master, each speed detection unit 10, 20, 30 has a front-side Profibus-DP interface (not shown).

Der Testgenerator 40 ist mit automatischen, zyklischen Prüfroutinen für Überdrehzahl, 2v3-Logik des 2v3-Ventilblocks sowie den Teilhubtest ausgestattet. Auf der Gehäusefront des Generators befindet sich ein Tastenfeld zur Parametrierung, ein Display zur Anzeige der Testdrehzahl, LEDs zur Anzeige des Status und eine Profibus-Schnittstelle zum Daten Austausch mit einem Profibus-Master (nicht dargestellt).The test generator 40 is equipped with automatic over-speed cyclic check routines, 2v3 logic of the 2v3 valve manifold and the partial stroke test. On the housing front of the generator is a keypad for parameterization, a display for displaying the test speed, LEDs for displaying the status and a Profibus interface for data exchange with a Profibus master (not shown).

In nicht näher dargestellter Weise kann ein Trip- oder Schnellschluss in einer fehlersicheren Steuerung gespeichert werden. Ein Trip-Reset kann in dieser fehlersicheren Steuerung realisiert sein. Das System geht vorzugsweise automatisch in den GUT-Zustand, wenn keine interne oder externe Tripbedingung ansteht. Für die Ausführung des Überdrehzahlschutzes ist eine fehlersichere Steuerung vorteilhaft.In a manner not shown, a trip or quick circuit can be stored in a fail-safe control. A trip reset can be realized in this fail-safe control. The system preferably automatically enters the GOOD state when there is no internal or external trip condition. For the execution of the overspeed protection a fail-safe control is advantageous.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Dampfturbinenläufersteam turbine runner
22
SchnellschlussventilQuick-closing valve
2.12.1
Arbeitszylinderworking cylinder
2.22.2
TellerfederBelleville spring
2.32.3
Arbeitsraumworking space
3, 3.1, 3.23, 3.1, 3.2
HydraulikfluidpassageHydraulic fluid passage
44
Entlastungsventilrelief valve
55
HydraulikfluidpassageHydraulic fluid passage
66
Entlastungsventil-SteuerventilanordnungRelief valve control valve arrangement
7, 7.1, 7.27, 7.1, 7.2
HydraulikfluidpassageHydraulic fluid passage
88th
erstes Steuerventilfirst control valve
99
zweites Steuerventilsecond control valve
10, 20, 3010, 20, 30
DrehzahlerfassungseinheitSpeed detection unit
10.1, 20.1, 30.110.1, 20.1, 30.1
Informationsleitunginformation line
10.2, 20.2,10.2, 20.2,
30.2 Steuerleitung30.2 Control line
11, 1211, 12
Rückschlagventilcheck valve
13, 1413, 14
einstellbare Drosseladjustable throttle
15, 15.1, 15.2, 15.21, 15.2215, 15.1, 15.2, 15.21, 15.22
HydraulikfluidpassageHydraulic fluid passage
1616
Drucksenke (Tank)Pressure sink (tank)
17.1, 17.2,17.1, 17.2,
17.3 Drehzahlerfassungseinrichtung17.3 Speed detection device
4040
Testgeneratortest generator
40.1, 40.240.1, 40.2
Hubsensorstroke sensor
40.3, 40.540.3, 40.5
Steuerleitungcontrol line
40.4, 40.640.4, 40.6
Informationsleitunginformation line
5050
ÜberdrehzahlerfassungssystemOverspeed detection system

Claims (16)

  1. Control device for a quick-action valve (2) of a steam turbine with a relief valve (4) for reducing a hydraulic pressure opening the quick-action valve; and
    a relief-valve/control-valve arrangement (6) with at least three valves, which are connected hydraulically to the relief valve in such a way that the latter only closes the quick-action valve if at least two valves of the relief valve/control valve arrangement are switched to a quick-action position;
    characterized by
    a test control valve arrangement (8, 9) for the optional reduction and increase of the hydraulic pressure opening the quick-action valve (2) when the relief valve (4) is closed.
  2. Control device according to claim 1, characterized in that the test control valve arrangement has a first control valve (8) and a second control valve (9).
  3. Control device according to claim 2, characterized in that the first control valve (8) and the second control valve (9) are connected in series.
  4. Control device according to one of the preceding claims 2 to 3, characterized in that arranged between the test control valve arrangement (8, 9) and the pressure source (P) and/or the quick-action valve (2) is a choke (13, 14), in particular an adjustable choke.
  5. Control device according to one of the preceding claims, characterized in that the relief valve/control valve arrangement (6) and the test control valve arrangement (8, 9) form a structural unit.
  6. Control device according to one of the preceding claims, characterized in that at least one valve of the relief valve/control valve arrangement (6) and/or at least one valve (8, 9) of the test control valve arrangement is formed as a 4/2-way solenoid valve.
  7. Control device according to one of the preceding claims, characterized in that the relief valve/control valve arrangement and/or the test control valve arrangement has end position monitoring.
  8. Control device according to one of the preceding claims, characterized in that it has a relief valve controller (10, 20, 30) for detecting the speed of the steam turbine and switching the relief valve/control valve arrangement (6) to the quick-action position.
  9. Control device according to claim 8, characterized in that the relief valve controller has at least three speed detection units (10, 20, 30), which are connected in such a way that the relief valve/control valve arrangement is only switched to a quick-action position if at least three speed detection units detect a speed of the steam turbine that exceeds a prescribed threshold value.
  10. Control device according to claim 9, characterized in that the speed detection units have a synchronous operation detector, a zero speed detector and/or an underspeed detector.
  11. Control device according to one of the preceding claims 9 to 10, characterized in that the connections of the relief valve controller (10, 20, 30) to at least three speed detection devices (17.1, 17.2, 17.3) and/or to at least three valves of the relief valve/control valve arrangement (6) are formed to be physically independent.
  12. Control device according to one of the preceding claims, characterized in that the relief valve controller has a test generator (40) for test actuation of the valves of the relief valve/control valve arrangement (6) and/or the test control valve arrangement (8, 9).
  13. Control device according to claim 12, characterized in that the test generator is parameterisable, has an operating hour meter and/or a start counter.
  14. Quick-action valve (2) for a steam turbine with a control device according to one of the preceding claims.
  15. Method for executing a partial stroke test of a quick-action valve (2) according to claim 14, characterized in that the test control valve arrangement (8, 9) reduces and then increases again the hydraulic pressure opening the quick-action valve when the relief valve is closed.
  16. Method according to claim 15, characterized in that at least three valves of the relief valve/control valve arrangement (6) are switched in turn individually to the quick-action position for testing.
EP20090749621 2008-05-20 2009-05-19 Control device and method for a quick-acting gate valve of a steam turbine Not-in-force EP2276935B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09749621T PL2276935T3 (en) 2008-05-20 2009-05-19 Control device and method for a quick-acting gate valve of a steam turbine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008024253A DE102008024253A1 (en) 2008-05-20 2008-05-20 Control device and method for a quick-closing valve of a steam turbine
PCT/EP2009/003585 WO2009141131A1 (en) 2008-05-20 2009-05-19 Control device and method for a quick-acting gate valve of a steam turbine

Publications (2)

Publication Number Publication Date
EP2276935A1 EP2276935A1 (en) 2011-01-26
EP2276935B1 true EP2276935B1 (en) 2012-01-04

Family

ID=40996492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090749621 Not-in-force EP2276935B1 (en) 2008-05-20 2009-05-19 Control device and method for a quick-acting gate valve of a steam turbine

Country Status (9)

Country Link
US (1) US20110072821A1 (en)
EP (1) EP2276935B1 (en)
JP (1) JP5160685B2 (en)
CN (1) CN102037249B (en)
AT (1) ATE540226T1 (en)
BR (1) BRPI0912859B1 (en)
DE (1) DE102008024253A1 (en)
PL (1) PL2276935T3 (en)
WO (1) WO2009141131A1 (en)

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DE102012022871A1 (en) * 2012-11-22 2014-05-22 Hydac System Gmbh locking device

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Publication number Priority date Publication date Assignee Title
EP2466077A1 (en) * 2010-12-17 2012-06-20 Alstom Technology Ltd Steam turbine overspeed protection
DE102011082599B4 (en) * 2011-09-13 2013-08-14 Keicher Hydraulik GmbH Valve arrangement, use, turbine and power plant
US10648357B2 (en) 2015-10-02 2020-05-12 Elliott Company Pneumatic trip valve partial stroking arrangement
CN114645744A (en) * 2021-10-29 2022-06-21 福建省鸿山热电有限责任公司 Protection optimization method for extraction condensing heat supply unit ETS
CN114352361B (en) * 2022-01-24 2023-10-27 重庆江增船舶重工有限公司 Overspeed test tool for steam turbine critical breaker assembly and using method of overspeed test tool

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DE2254250C3 (en) 1972-11-06 1980-06-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Speed limiter for a turbine
CH621178A5 (en) * 1977-06-08 1981-01-15 Bbc Brown Boveri & Cie
US5269141A (en) * 1990-06-18 1993-12-14 Asea Brown Boveri Ltd. Hydraulic safety and regulating system
EP0496021B1 (en) * 1991-01-25 1994-11-30 Asea Brown Boveri Ag Stopvalve for hydraulic power and safety system
US5381822A (en) * 1993-11-26 1995-01-17 Dana Corporation Relief valve with hydraulic fuse
US6435022B1 (en) * 2001-02-09 2002-08-20 Tareq Nasser Albuaijan Partial stroke testing system
DE102004042891B3 (en) * 2004-08-31 2005-10-06 Hydac System Gmbh Safety circuit for media-powered consumers and method of operation thereof
US8151813B2 (en) * 2007-06-22 2012-04-10 Invensys Systems, Inc. Quad-redundant hydraulic trip system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012022871A1 (en) * 2012-11-22 2014-05-22 Hydac System Gmbh locking device
US10066645B2 (en) 2012-11-22 2018-09-04 Hydac System Gmbh Turbine valve actuator

Also Published As

Publication number Publication date
WO2009141131A1 (en) 2009-11-26
PL2276935T3 (en) 2012-08-31
DE102008024253A1 (en) 2009-11-26
JP2011521158A (en) 2011-07-21
CN102037249B (en) 2015-05-20
BRPI0912859B1 (en) 2020-06-09
CN102037249A (en) 2011-04-27
BRPI0912859A2 (en) 2019-03-06
US20110072821A1 (en) 2011-03-31
EP2276935A1 (en) 2011-01-26
ATE540226T1 (en) 2012-01-15
JP5160685B2 (en) 2013-03-13

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