EP0376914A2 - Méthode pour tester les soupapes individuelles des turbines à vapeur et dispositif de mise en oeuvre de la méthode - Google Patents

Méthode pour tester les soupapes individuelles des turbines à vapeur et dispositif de mise en oeuvre de la méthode Download PDF

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Publication number
EP0376914A2
EP0376914A2 EP89890329A EP89890329A EP0376914A2 EP 0376914 A2 EP0376914 A2 EP 0376914A2 EP 89890329 A EP89890329 A EP 89890329A EP 89890329 A EP89890329 A EP 89890329A EP 0376914 A2 EP0376914 A2 EP 0376914A2
Authority
EP
European Patent Office
Prior art keywords
pressure
test
line
valve
oil
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
EP89890329A
Other languages
German (de)
English (en)
Other versions
EP0376914A3 (fr
EP0376914B1 (fr
Inventor
Albert Dipl.-Ing. Harrer
Franz Kagl
Günter Lunacek
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.)
Austrian Energy and Environment SGP Waagner Biro GmbH
Original Assignee
Austrian Energy and Environment SGP Waagner Biro GmbH
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 Austrian Energy and Environment SGP Waagner Biro GmbH filed Critical Austrian Energy and Environment SGP Waagner Biro GmbH
Publication of EP0376914A2 publication Critical patent/EP0376914A2/fr
Publication of EP0376914A3 publication Critical patent/EP0376914A3/fr
Application granted granted Critical
Publication of EP0376914B1 publication Critical patent/EP0376914B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/18—Final actuators arranged in stator parts varying effective number of nozzles or guide conduits, e.g. sequentially operable valves for steam turbines
    • 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
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
    • F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
    • F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/20—Checking operation of shut-down devices

Definitions

  • the invention relates to a test method according to the preamble of patent claim 1.
  • Another object of the invention relates to a test device according to the preamble of claim 6.
  • valves being each provided with a hydraulic actuator which can be actuated by a pressure oil line under the influence of an automatic control device against the action of a spring acting on the valve in the closing direction, the supply to the first blade ring of the Runner so that several sectors are provided distributed over the circumference, which are automatically controlled separately with steam via one or more valves according to the power requirement.
  • individual valves e.g. lose their full functionality due to impurities in the steam or through deposits, which can easily occur, especially during long operation with constant load.
  • the presence of a e.g. stiff or stuck valve for the time since the other valves compensate for the under or underperformance of this valve with automatic control.
  • the error is usually only recognized when it is no longer possible to operate the valve without removing it.
  • US Pat. No. 4,059,960 describes a partial stroke test device for valves of a steam turbine with reheating.
  • the valve movements during the test must remain very small so that there are no noticeable changes in the amount of steam and thus also in the turbine output.
  • the control signal of the control system is preferably switched off during the duration of the valve test, so that there is no closed control loop.
  • the control signal overrides any test signal, in the case of turbines which are operated with fluctuating outputs, a valve test would usually be interrupted due to the control signal which is always necessary and, with a few exceptions, made impossible.
  • US Pat. No. 4,059,960 does not mention the means by which valve control is carried out.
  • the object of the invention is to remedy the shortcomings mentioned above. This object is achieved by the measure according to the characterizing part of patent claim 1. The exact adjustment of the oil pressure between the supply line and the test control line in combination with the opening of the connection can only be seen after the adjustment has been confirmed.
  • test device used is characterized in claim 6. Its main feature is the balancing device, which interacts with a known switching valve in the feed line in such a way that the opening of the switching valve is only possible after feedback of the balancing of the pressure in the feed and test control device.
  • the drawing shows a circuit diagram for a control sector of the steam turbine with the devices required for the invention.
  • the automatic control for the turbine usually working in such a way that in the event of small load fluctuations from a basic setting for all valves, only the valves 5 of one of the sectors are changed in their position, and the other sectors remain with the basic setting.
  • the passage 15 from the individual valves 5 leads to the turbine nozzle.
  • the individual control sectors can of course have a different number of valves than that shown, controls with a separately controlled supply line for each valve 5 being well known.
  • a common pressure oil line 4 the pressure of which is regulated by the automatic control device for the turbine, leads with its branch lines 4 'to the individual piston-cylinder units 10 of the valves 5.
  • These piston-cylinder units work against the pressure of the valves in the closing direction Acting springs, so that the prevailing in the pressure oil line 4 or the branch lines 4 'oil pressure determines the opening position of the individual valves.
  • switchable valves 3 are provided, which are additionally connected to a common test control line 11.
  • the piston-cylinder units 10 can be individually connected to the test control line 11, with a disconnection from the supply branch line 4 'taking place at the same time.
  • a balancing device 12 consisting of a differential pressure meter is installed, which transmits its measured values via a line 18 to the test device 1.
  • test control line 11 a pressure transducer 2 that can be regulated by the test device is installed, the supply line 6 'of which is connected to an oil pressure line 6, in which a higher pressure prevails than the maximum control pressure in the control pressure line 4.
  • control device as shown in the drawing, is provided with a hydraulic quick-closing control, which consists of safety valves arranged in the individual piston-cylinder units 10, which act against the pressure with which the pistons of the piston-cylinder unit 10 are actuated a pressure line 6, 6 ⁇ are kept closed, this pressure line 6 in the event of a rapid shutdown of the turbine, can be decoupled from the oil pressure generator by the control device and connected to a return line (not shown) to the oil reservoir, this line 6 is advantageous in the case of the invention Test device used, since the supply line 6 'to the test control line 11 is immediately depressurized.
  • the test device 1 itself is also advantageously connected to a power supply 7, which is automatically interrupted in the event of the aforementioned rapid shutdown of the turbine.
  • the operation of the described device is as follows:
  • the test device 1 is connected to one of the provided connection points for the individual control sectors with the electrical lines 17 for the magnets 16, the signal line 18 for the differential pressure indicator 12 and the control line 19 for the pressure converter 2.
  • the pressure transducer is set via the control line 19 so that the pressure in the test control line 11 corresponds to that in the control pressure line 4 or 4 ', which is indicated by the differential pressure meter 12 via line 18. If there is pressure in the two lines 4 and 11, one of the magnets 16 is actuated via the corresponding line 17, as a result of which the changeover valve 3 associated with it connects the pressure supply for the associated piston-cylinder unit 10 to the line 11.
  • a safety device is installed in the test device, which allows actuation of the magnets 16 only when the pressure in the two lines 4 and 11 is equal. Now, by slowly changing the pressure in the test control line 11, so that the automatic control device can compensate for the changing steam flow by controlling the valves 5 in the other sectors or in the intended control sector without affecting the operation, the valve 5 to be tested over its entire stroke or be adjusted several times.
  • the control that the valve is adjusted over its entire stroke can be done in various ways, e.g. by measurement, limit switch, or by back calculation from the data provided by the automatic control during the test process. This process is repeated for each of the valves 5 in the control sector.
  • the test device has the advantage, on the one hand, that all valves which have faults can be determined precisely, and, on the other hand, the advantage that valve malfunctions from regular actuations (during the test) do not even occur.
  • the test device can also be equipped with a maximum and minimum pressure limiter, so that adjustments of the test control pressure can only be carried out effectively in the area in which the control device operates via the control oil pressure line 4 in order to prevent incorrect operation with a small or very large load.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
EP19890890329 1988-12-28 1989-12-20 Méthode pour tester les soupapes individuelles des turbines à vapeur et dispositif de mise en oeuvre de la méthode Expired - Lifetime EP0376914B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT317788A AT400172B (de) 1988-12-28 1988-12-28 Verfahren zum testen und testeinrichtung für dampfturbinen-regelventile
AT3177/88 1988-12-28

Publications (3)

Publication Number Publication Date
EP0376914A2 true EP0376914A2 (fr) 1990-07-04
EP0376914A3 EP0376914A3 (fr) 1991-07-24
EP0376914B1 EP0376914B1 (fr) 1994-04-13

Family

ID=3546539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890890329 Expired - Lifetime EP0376914B1 (fr) 1988-12-28 1989-12-20 Méthode pour tester les soupapes individuelles des turbines à vapeur et dispositif de mise en oeuvre de la méthode

Country Status (3)

Country Link
EP (1) EP0376914B1 (fr)
AT (1) AT400172B (fr)
DE (1) DE58907465D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433791A1 (fr) * 1989-12-21 1991-06-26 Asea Brown Boveri Ag Actuateur pour une valve d'alimentation
EP0496021A1 (fr) * 1991-01-25 1992-07-29 Asea Brown Boveri Ag Soupape d'arrêt pour système hydraulique de sécurité

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB795345A (en) * 1953-11-24 1958-05-21 Bbc Brown Boveri & Cie Arrangement for testing the overspeed safety devices of steam turbines
US2998017A (en) * 1960-03-28 1961-08-29 Gen Electric Emergency governor exerciser
US3382880A (en) * 1965-12-01 1968-05-14 Gen Electric Automatic trip test system
US4019390A (en) * 1976-04-22 1977-04-26 Westinghouse Electric Corporation System and method for complete on line testing of a mechanical overspeed trip channel associated with an electrohydraulic emergency trip system for a turbine power plant
US4059960A (en) * 1976-03-11 1977-11-29 Westinghouse Electric Corporation Method and apparatus for testing the movability of valve plugs
US4343454A (en) * 1980-06-26 1982-08-10 General Electric Company Apparatus for individual isolation of hydraulically actuated valves

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH514067A (de) * 1970-03-31 1971-10-15 Bbc Brown Boveri & Cie Verfahren und Einrichtung zur Prüfung von Überwachungsorganen an einer Turbinenanlage
US3682564A (en) * 1971-04-26 1972-08-08 Laval Turbine Turbine overspeed trip system with testing mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB795345A (en) * 1953-11-24 1958-05-21 Bbc Brown Boveri & Cie Arrangement for testing the overspeed safety devices of steam turbines
US2998017A (en) * 1960-03-28 1961-08-29 Gen Electric Emergency governor exerciser
US3382880A (en) * 1965-12-01 1968-05-14 Gen Electric Automatic trip test system
US4059960A (en) * 1976-03-11 1977-11-29 Westinghouse Electric Corporation Method and apparatus for testing the movability of valve plugs
US4019390A (en) * 1976-04-22 1977-04-26 Westinghouse Electric Corporation System and method for complete on line testing of a mechanical overspeed trip channel associated with an electrohydraulic emergency trip system for a turbine power plant
US4343454A (en) * 1980-06-26 1982-08-10 General Electric Company Apparatus for individual isolation of hydraulically actuated valves

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0433791A1 (fr) * 1989-12-21 1991-06-26 Asea Brown Boveri Ag Actuateur pour une valve d'alimentation
EP0496021A1 (fr) * 1991-01-25 1992-07-29 Asea Brown Boveri Ag Soupape d'arrêt pour système hydraulique de sécurité

Also Published As

Publication number Publication date
EP0376914A3 (fr) 1991-07-24
EP0376914B1 (fr) 1994-04-13
DE58907465D1 (de) 1994-05-19
ATA317788A (de) 1995-02-15
AT400172B (de) 1995-10-25

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