EP2466077A1 - Protection contre l'excès de vitesse d'une turbine à vapeur - Google Patents

Protection contre l'excès de vitesse d'une turbine à vapeur Download PDF

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Publication number
EP2466077A1
EP2466077A1 EP10195773A EP10195773A EP2466077A1 EP 2466077 A1 EP2466077 A1 EP 2466077A1 EP 10195773 A EP10195773 A EP 10195773A EP 10195773 A EP10195773 A EP 10195773A EP 2466077 A1 EP2466077 A1 EP 2466077A1
Authority
EP
European Patent Office
Prior art keywords
control
steam turbine
overspeed
trigger event
time
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.)
Withdrawn
Application number
EP10195773A
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German (de)
English (en)
Inventor
Martin Koller
Hubert Scheuermann
Frank Mäckle
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.)
GE Vernova GmbH
Original Assignee
Alstom Technology 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 Alstom Technology AG filed Critical Alstom Technology AG
Priority to EP10195773A priority Critical patent/EP2466077A1/fr
Priority to DE102011120692A priority patent/DE102011120692A1/de
Priority to JP2011275283A priority patent/JP5535185B2/ja
Priority to CN2011104250746A priority patent/CN102536349A/zh
Priority to US13/328,169 priority patent/US20120151922A1/en
Publication of EP2466077A1 publication Critical patent/EP2466077A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/02—Purpose of the control system to control rotational speed (n)
    • F05D2270/021—Purpose of the control system to control rotational speed (n) to prevent overspeed

Definitions

  • the present disclosure relates generally to steam turbine overspeed protection and more specifically to the control of overspeed in the case of a steam turbine unloading event.
  • steam turbines are equipped with trip systems to ensure that the steam turbine speed does not exceed a defined overspeed value. Overspeed may occur following steam turbine unloading events and result in a transient rotational speed spike caused by the delay in system dynamics and control system lag as the turbine's control system assumes new control positions.
  • the event may be an undetectable load shedding event, such as a sudden drop in power demand, or else a detectable event, such as the opening of a power breaker.
  • Power grid codes typically pre-define operating bands that limit operation above nominal speeds.
  • the overspeed trip setpoint is thus determined by adding the expected overspeed resulting from a load shedding event to the peak overspeed within an operating band.
  • the power plant is available to be brought on line as soon as possible. As it may take long to bring a plant on line after a trip is preferable to limit the number of trips.
  • Machine damage may also occur below the maximum rotor designed overspeed if, for example, resonance build-up occurs within the blading. While damaging resonance build-up in the blading typically occurs only if a particular system specific overspeed is sustained and so does not occur during transient overspeed events such as unloading events, it is nonetheless preferable to minimise the exposure of blades to overspeed in order to reduce potential blade stressing.
  • An objective of the invention is to overcome the problem of steam turbine overspeed exposure during upset conditions..
  • the disclosure is based on the general idea of varying the trip setting based on the monitoring of an intermediate steam turbine control system parameters. If the intermediate control parameter has neither started nor completed its expected action within a predetermined time an alert is raised. The underlying presumption is that in such a case a control fault has occurred which means the control system will not be able to prevent the tripping of the steam turbine on overspeed.
  • a further aspect therefore provides a steam turbine trip thus limiting the overspeed exposure of the steam turbine.
  • An aspect therefore provides a steam turbine compromising an overspeed control system for responding to the deloading of the steam turbine.
  • the control system comprises: a control system fault alert for identifying a fault in the control system; a trigger event that defines the point of deloading of the steam turbine; a control feature configured to achieve a control states in respond to the deloading; and a predetermined control time defined as the expected time interval between the trigger event and the point at which the control feature has achieved the control state.
  • the control system fault alert is configured to initiate if, in response to the deloading of the steam turbine, the control states is not achieved with the control time.
  • Another aspect provides a method of generating a steam turbine overspeed control system fault alert comprising providing a steam turbine with the overspeed control system wherein the control system has a trigger event that defines the point of deloading of the steam turbine.
  • a control feature configured to achieve a control state in response to the trigger event within a control time, is provided to the control system. The method further includes initiating a fault alert if the control state is not achieved within the control time.
  • an overspeed control system 16 for preventing or at least minimising overspeed OS of a steam turbine 10 in both normal and upset conditions is provided.
  • a steam turbine 10 compromises an overspeed control system 16 for responding to the deloading of the steam turbine 10.
  • the control system 16 has: a control system fault alert FA for identifying a fault in the control system 16; a trigger event TE used to identify of the steam turbine 10 is deloading; a control feature 12 configured to achieve a control state CS in response to the deloading; and a control time CT defined as the estimated time it takes between first initiation of the trigger event TE and the point in time at which the control feature 12 achieves the control states CS.
  • a fault alert FA maybe provided.
  • the fault alert FA maybe used simply as a fault indicator or alternatively as a means to initiate a steam turbine trip.
  • a trigger event TE may be any indication that identifies that a steam turbine 10 unloading event has occurred.
  • the trigger event TE may be a predefined overspeed OS or alternatively, when the steam turbine 10 is a component of a power plant, a signal that a breaker 18 of the power plant, as shown in Fig. 1 , is open.
  • a control feature 12, as shown in Fig. 1 may be a steam control valve for controlling the amount of steam fed to the steam turbine 10 by means of changing the control states CS of the control valve.
  • a control feature 12 may be an extraction control valve (not shown) for controlling steam extraction from the steam turbine 10.
  • Examples of control states CS include predefined valve positions, such as partially open or closed, and valve position ranges, such as "less than 80% open”.
  • control time CT is also directly related to a trigger event TE as it forms the basis for the measurement, in a further exemplary embodiment shown in Fig. 5 , overspeed OS is further used as an indication of the trigger event TE.
  • a fault alert FA is configured to initiate if the steam turbine 10 achieves an overspeed OS if the control feature 12 has not achieved the control states CS.
  • Each of these exemplary embodiments may comprise control features 12 that each comprise several control actions resulting in either as final control states CS or intermediate control states CS.
  • a final control state CS is a state of the control feature 12 that has the longest control time CT of all the control states CS of that control feature 12.
  • An example of a final control state CY is the closed state a valve control feature 12 that is normally open.
  • an intermediate control state CS is a partially open valve position or alternative a range of partially open valve position above a certain value.
  • control feature 12 is a steam control valve for controlling the amount of steam fed to a steam turbine 10 and the control state CS is the closing of the control valve below an estimated value that is estimated based on nominal full load steam turbine 10 operation.
  • control feature 12 is also a steam control valve for controlling the steam flow to a steam turbine 10 but the control action is the full closure of the steam control valve.
  • control feature 12 includes a control measurement device for determining the control states CS of the control feature 12.
  • a control measurement device for determining the control states CS of the control feature 12.
  • An example is a proximity switch located on an exemplary control valve.
  • control system 16 includes a plurality of control features 12 wherein the by means of a voting system, the status of the control system 16 is determined. For example, in an embodiment with two control features 12, a fault alert FA may be initiated if either one or both of the control features 12 does not achieve the expected control state CS. With further control features 12 other redundant voting systems maybe used, for example, one out of three, two out of three, three out of three etc.
  • control state CS is determined by means of a measurement device. In another not shown exemplary embodiment the control state CS is determined by means of the command to the control feature 12.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Turbines (AREA)
EP10195773A 2010-12-17 2010-12-17 Protection contre l'excès de vitesse d'une turbine à vapeur Withdrawn EP2466077A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP10195773A EP2466077A1 (fr) 2010-12-17 2010-12-17 Protection contre l'excès de vitesse d'une turbine à vapeur
DE102011120692A DE102011120692A1 (de) 2010-12-17 2011-12-05 Verfahren und System zum Dampfturbinenüberdrehzahlschutz
JP2011275283A JP5535185B2 (ja) 2010-12-17 2011-12-16 蒸気タービンの超過速度を防止する方法及びシステム
CN2011104250746A CN102536349A (zh) 2010-12-17 2011-12-16 蒸汽轮机超速保护方法和系统
US13/328,169 US20120151922A1 (en) 2010-12-17 2011-12-16 Steam turbine overspeed protection method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10195773A EP2466077A1 (fr) 2010-12-17 2010-12-17 Protection contre l'excès de vitesse d'une turbine à vapeur

Publications (1)

Publication Number Publication Date
EP2466077A1 true EP2466077A1 (fr) 2012-06-20

Family

ID=44001894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10195773A Withdrawn EP2466077A1 (fr) 2010-12-17 2010-12-17 Protection contre l'excès de vitesse d'une turbine à vapeur

Country Status (5)

Country Link
US (1) US20120151922A1 (fr)
EP (1) EP2466077A1 (fr)
JP (1) JP5535185B2 (fr)
CN (1) CN102536349A (fr)
DE (1) DE102011120692A1 (fr)

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JP5964229B2 (ja) * 2012-12-28 2016-08-03 三菱重工業株式会社 発電システム
CN103590858B (zh) * 2013-11-19 2015-12-02 中国神华能源股份有限公司 防止电厂机组汽轮机转速飞升的系统和方法
US10690002B2 (en) * 2014-01-22 2020-06-23 Thomas Revak Turbine overspeed trip test system
US10690003B2 (en) * 2014-01-22 2020-06-23 Thomas Revak Method of using a turbine overspeed trip testing system
CN105179025B (zh) * 2015-09-02 2017-01-11 北京市可持续发展促进会 自容式汽轮机转速保护调节装置
US10156153B2 (en) 2016-08-31 2018-12-18 General Electric Technology Gmbh Advanced tightness test evaluation module for a valve and actuator monitoring system
US10066501B2 (en) 2016-08-31 2018-09-04 General Electric Technology Gmbh Solid particle erosion indicator module for a valve and actuator monitoring system
US10871081B2 (en) 2016-08-31 2020-12-22 General Electric Technology Gmbh Creep damage indicator module for a valve and actuator monitoring system
US10626749B2 (en) 2016-08-31 2020-04-21 General Electric Technology Gmbh Spindle vibration evaluation module for a valve and actuator monitoring system
US10544700B2 (en) 2016-08-31 2020-01-28 General Electric Technology Gmbh Advanced startup counter module for a valve and actuator monitoring system
US10151216B2 (en) 2016-08-31 2018-12-11 General Electric Technology Gmbh Insulation quality indicator module for a valve and actuator monitoring system
US10233786B2 (en) 2017-03-28 2019-03-19 General Electric Technology Gmbh Actuator spring lifetime supervision module for a valve and actuator monitoring system
CN112228165A (zh) * 2020-10-14 2021-01-15 北京博力威格智能传控设备有限公司 一种汽轮机调速方法、系统及存储介质
CN112821355B (zh) * 2020-11-25 2023-03-24 华能海南发电股份有限公司东方电厂 一种发变组保护联跳汽轮机的回路

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Also Published As

Publication number Publication date
JP5535185B2 (ja) 2014-07-02
DE102011120692A1 (de) 2012-06-21
JP2012132447A (ja) 2012-07-12
CN102536349A (zh) 2012-07-04
US20120151922A1 (en) 2012-06-21

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