EP0509347B1 - System for monitoring the operation of a steam turbine - Google Patents

System for monitoring the operation of a steam turbine Download PDF

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Publication number
EP0509347B1
EP0509347B1 EP19920105807 EP92105807A EP0509347B1 EP 0509347 B1 EP0509347 B1 EP 0509347B1 EP 19920105807 EP19920105807 EP 19920105807 EP 92105807 A EP92105807 A EP 92105807A EP 0509347 B1 EP0509347 B1 EP 0509347B1
Authority
EP
European Patent Office
Prior art keywords
steam
relative
turbine
re
determined
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.)
Expired - Lifetime
Application number
EP19920105807
Other languages
German (de)
French (fr)
Other versions
EP0509347A1 (en
Inventor
Paul Dipl.-Ing. Girbig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4112427 priority Critical
Priority to DE4112427 priority
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0509347A1 publication Critical patent/EP0509347A1/en
Application granted granted Critical
Publication of EP0509347B1 publication Critical patent/EP0509347B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D1/00Non-positive-displacement machines or engines, e.g. steam turbines
    • F01D1/02Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
    • F01D1/023Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines the working-fluid being divided into several separate flows ; several separate fluid flows being united in a single flow; the machine or engine having provision for two or more different possible fluid flow paths
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00Regulating or controlling by varying flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00Regulating or controlling by varying flow
    • F01D17/02Arrangement of sensing elements
    • F01D17/04Arrangement of sensing elements responsive to load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for

Description

  • The invention relates to a method for monitoring the operating state of a steam turbine, which can be supplied with an adjustable inlet steam quantity and a variable, partially expanded steam quantity can be extracted. It is also directed to a device for performing the method.
  • Such a monitoring device is usually used in the control room of a power plant. In a device known from DE-OS 2 032 143, the respective operating point determined by the amount of inlet steam and the power output is made visible on a screen of a display device within a steam extraction diagram of the turbine. To determine the operating point, absolute deflection values of the inlet steam quantity and the power of the turbine generator are fed to the deflection system of the screen. However, by using absolute measured values, there is a risk that if the vapor state changes, e.g. of the steam pressure or the steam temperature, deviations between the fixed predefined extraction steam limits and the characteristics of the extraction steam diagram shown on the screen occur.
  • It is possible to adapt to changing steam conditions by electronic means by constantly updating the sampling steam diagram on the screen. However, with such a growing and shrinking extraction steam diagram, a clear representation is not possible.
  • The invention is therefore based on the object of designing a method and a device of the type mentioned at the outset such that, regardless of changes in the steam state, simple means enable a clear representation when monitoring the operating state of a steam turbine.
  • With regard to the method, the object is achieved according to the invention in that firstly a percentage value for the inlet steam quantity and from this relative inlet steam quantity a percentage value for the turbine power is determined, and then within a characteristic field for different extraction steam quantities the respective one by the relative inlet steam quantity and the relative turbine power specific operating point is shown.
  • According to an advantageous development of the method according to the invention, in a steam turbine with a plurality of turbine parts, the relative turbine power is formed from the sum of the relative partial powers, each relative partial power being determined from the relative amount of steam supplied to each turbine part. In this case, the relative amount of withdrawal steam can be expediently determined from the difference between the relative amounts of steam supplied to the turbine parts.
  • With regard to the device, the object is achieved in a steam turbine in which the amount of inlet steam that can be supplied is adjustable with an actuator, according to the invention with means for converting a position signal of the actuator into a percentage value of the corresponding inlet steam quantity, with further means for converting the percentage value of the inlet steam quantity into a percentage value of the turbine power, and with a display device with a screen on which the respective working point determined by the relative input steam amount and the relative turbine power can be represented within a characteristic field for different extraction steam amounts.
  • According to an advantageous embodiment of the device according to the invention, display fields for displaying absolute and relative state variables, preferably steam pressure and steam temperature and steam quantity, are provided on the screen. This provides the operating personnel with additional information about the operating state of the steam turbine.
  • The advantages achieved by the invention are, in particular, that due to the transformation of the determined values for the respective steam quantity and the corresponding turbine output into relative sizes, the limits of the extraction steam diagram displayed on the screen are unchanged in every actual state. It is possible to monitor a steam turbine system in a compact and clear form on a few centimeters large display area regardless of steam conditions.
  • The operating state of the steam turbine is advantageously represented by a crosshair within a coordinate system, from which both the operating and performance limits and the corresponding reserves of the steam turbine can be seen. In addition to the graphical representation of the current operating or working point within the coordinate field, current measured values can advantageously also be displayed in digital form and fault messages with color changes can be shown. If necessary intervention and fault messages can be jumped to via a menu selection below the graphic in detailed representations of the steam turbine system or in operating and fault message tables.
  • For a more detailed explanation of the invention, an embodiment is described with reference to a drawing. The drawing shows a steam turbine and a monitoring device according to the invention with a measuring circuit and a display device in a schematic representation.
  • The figure shows the steam turbine 1 with a high-pressure turbine part 2 and a low-pressure turbine part 3. The turbine parts 2 and 3 drive a generator 5 via a common shaft 4.
  • Steam is supplied to the steam turbine 1 via a live steam line 6, which after relaxation in the high-pressure turbine part 2 is supplied in whole or in part in the direction of the arrow 8 via a line 7 to the low-pressure turbine part 3. As indicated by arrow 9, part of the partially expanded steam can be removed at a removal point 10 of the turbine part 2. The steam released in the low-pressure turbine part 3 leaves the steam turbine 1 in the direction of the arrow 11 and is e.g. fed to a capacitor (not shown).
  • In the live steam line 6 and in the line 7, an actuator or valve 12 or 13 are switched on. With valve 12, the amount of steam E entering steam turbine 1 is set. Accordingly, the amount of steam E 'entering the turbine part 3 is set with the valve 13.
  • The actuators or valves 12 and 13 each emit a signal line 14 or 15, via which the signals corresponding to the positions of the actuators 12 or 13 are fed to a device 20 shown in broken lines for processing the measured values.
  • The device 20 comprises a first converter 22 connected to the signal line 14 and a second converter 23 connected to the signal line 15. In the converters 22 and 23, the signals corresponding to the positions of the actuators 12 and 13, for example on the basis of comparison values or characteristic curves, converted into percentage values RE or RE 'for relative amounts of steam. The percentage value RE determined in the converter 22 thus corresponds to the relative amount of steam that enters the high-pressure turbine part 2 of the steam turbine 1.
  • The percentage value RE 'determined in the converter 23 corresponds to the fictitious relative amount of steam that will enter from the high-pressure turbine part 2 into the low-pressure turbine part 3 of the steam turbine 1 when this amount of steam has flowed into the high-pressure turbine part 2 of the steam turbine 1.
  • The percentage value RE determined in the converter 22 is fed via a signal line 24 to a display device 25 with a screen 26. This value RE forms the y coordinate in a coordinate field 27 shown on the screen 26.
  • The percentage value RE determined in the converter 22 is also fed to a further converter 31 via a line 30. With the converter 31, the relative amount of inlet steam RE, e.g. on the basis of a stored table of values, converted into a percentage value P for the turbine output of the high-pressure turbine part 2. This percentage value P is likewise supplied to the display device 25 via lines 32 and 40.
  • The percentage value RE 'determined in the converter 23 is fed via a line 50 to a subtractor 51 and via a line 52 to a converter 53. The converter 53, like the converter 31, serves to determine the relative or percentage turbine power P. For this purpose, a percentage value P ′, determined in the converter 53 from the relative steam quantity RE ′ supplied to the turbine part 3, for the partial output of the turbine part 3 is in a summing element 54 added to the relative partial output of the turbine part 2. The relative turbine power P of the steam turbine 1 determined in this way is fed to the display device 25 via the line 40 and forms the x coordinate in the coordinate field 27 shown on the screen 26. In the event that no steam is fed to the turbine part 3 only the percentage value P determined in the converter 31 and supplied via the lines 32 and 40 to the display device 25 is the x coordinate.
  • The working point determined by the x and y coordinates is depicted in the form of a light spot or crosshair 41 within a sampling steam diagram 42. The extraction steam diagram 42 is formed by a number of characteristic curves 43 displayed on the screen 26.
  • In a subtractor 51, to which the percentage value RE from the converter 22 is fed via a line 55, the difference between the percentage values RE and RE 'for the steam quantities E and E' in the turbine parts 2 and 3 becomes that at the extraction point 10 escaping relative extraction steam amount determined. This percentage value K determined in the subtractor 51 is fed to the display device 25 via a line 56 and is displayed on the screen 26 in a display field 60 as a relative or absolute numerical value. In additional display fields 61 and 62, numerical values for the current turbine output or inlet steam quantity, or for the positions of the actuators or valves 12 and 13, are additionally displayed in percent or absolute. In a further display field 63 the relative amounts of steam supplied to the turbine parts 2 and 3, e.g. in the form of vertical bars along a percentage scale.
  • A selection element 65 is connected to line 50, to which the percentage value RE determined in converter 22 is fed via line 66. The selector 65 compares the percentage values RE and RE 'from the converters 22 and 23 with one another and corrects values that are less than zero. Such a value can arise, for example, if the valve 13 is opened further than the valve 12, but at the same time a comparatively smaller amount of steam flows through the valve 13 due to steam extraction. The smaller of the two values RE, RE 'is fed via line 50 to converter 53 and subtractor 51.
  • By monitoring the operating state of a steam turbine 1 according to the invention on the basis of relative values RE, RE 'and P for the steam quantities and the turbine power, it is achieved that there is no difference between the predetermined or preprogrammed steam limits in the actuators 12, 13 and those shown on the screen 26 Limits of the extraction steam diagram 42 arise.
  • The positions of the actuators or valves 12 and 13 can also be supplied to the display device 25 directly, for example via signal lines (not shown) directly connected to the valves 12 and 13, and there in a further display field (not shown), for example in the form of vertical bars along a percentage scale.

Claims (5)

  1. Method for monitoring the operating state of a steam turbine to which an adjustable inlet steam quantity (E) can be supplied and from which a variable partly expanded steam quantity can be extracted, characterised in that
    - in the first instance a percentage value (RE) for the inlet steam quantity (E) is determined and from this relative inlet steam quantity (RE) a percentage value (P) for the turbine output is determined, and
    - subsequently the respective operating point, which is determined by the relative inlet steam quantity (RE) and the relative turbine output (P), is represented within a characteristics field (43) for different extraction steam quantities.
  2. Method according to claim 1, characterised in that in the case of a steam turbine (1) having a plurality of turbine portions (2, 3) the relative turbine output (P) is established from the sum of the relative partial outputs (P'), with each relative partial output (P') being determined from the relative steam quantity (RE, RE') supplied to each turbine portion.
  3. Method according to claim 2, characterised in that the relative extraction steam quantity is determined from the difference of the relative steam quantities (RE, RE') supplied to the turbine portions (2, 3).
  4. Arrangement for monitoring the operating state of a steam turbine (1) to which an inlet steam quantity (E), which can be adjusted with a final control element (12), can be supplied and from which a variable partly expanded steam quantity can be extracted, characterised by
    - means (22) for converting a position signal of the final control element (12) into a percentage value (RE) of the corresponding inlet steam quantity (E),
    - further means (31) for converting the percentage value (RE) of the inlet steam quantity (E) into a percentage value (P) of the turbine output, and
    - a display arrangement (25) with a screen (26) on which the respective operating point, which is determined by the relative inlet steam quantity (RE) and the relative turbine output (P), can be represented within a characteristics field (43) for different extraction steam quantities.
  5. Arrangement according to claim 4, characterised in that on the screen (26) display fields (60, 61, 62, 63) are provided for displaying absolute and/or relative operating variables or state variables, preferably steam pressure and steam temperature and also steam quantity.
EP19920105807 1991-04-16 1992-04-03 System for monitoring the operation of a steam turbine Expired - Lifetime EP0509347B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4112427 1991-04-16
DE4112427 1991-04-16

Publications (2)

Publication Number Publication Date
EP0509347A1 EP0509347A1 (en) 1992-10-21
EP0509347B1 true EP0509347B1 (en) 1995-01-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920105807 Expired - Lifetime EP0509347B1 (en) 1991-04-16 1992-04-03 System for monitoring the operation of a steam turbine

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US (1) US5201180A (en)
EP (1) EP0509347B1 (en)
JP (1) JP3148349B2 (en)
AT (1) AT117407T (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5913184A (en) * 1994-07-13 1999-06-15 Siemens Aktiengesellschaft Method and device for diagnosing and predicting the operational performance of a turbine plant
US5660037A (en) * 1995-06-27 1997-08-26 Siemens Power Corporation Method for conversion of a reheat steam turbine power plant to a non-reheat combined cycle power plant
DE19755044C1 (en) * 1997-12-11 1999-03-04 Daimler Benz Ag Motor vehicle steering arrangement
DE59911050D1 (en) * 1999-09-30 2004-12-16 Abb Schweiz Ag Representation of an operating state of a system
US6910364B2 (en) * 2000-08-17 2005-06-28 Siemens Aktiengesellschaft Diagnosis method for detecting ageing symptoms in a steam turbine
US8337139B2 (en) * 2009-11-10 2012-12-25 General Electric Company Method and system for reducing the impact on the performance of a turbomachine operating an extraction system
US9611752B2 (en) 2013-03-15 2017-04-04 General Electric Company Compressor start bleed system for a turbine system and method of controlling a compressor start bleed system
JP5397560B1 (en) * 2013-04-05 2014-01-22 富士電機株式会社 Method and apparatus for safe operation of extraction steam turbine power generation facility
WO2017122481A1 (en) 2016-01-13 2017-07-20 イーグル工業株式会社 Accumulator
CN106523041B (en) * 2016-10-12 2018-01-02 国网上海市电力公司 A kind of steam turbine differential expansion Protection control system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT293445B (en) * 1969-07-01 1971-10-11 Siemens Gmbh Means for monitoring the operating condition of steam turbine
BE767732R (en) * 1970-06-05 1971-10-18 Siemens Gmbh turbines running the monitoring device has
DE2209943A1 (en) * 1972-03-02 1973-09-13 Hermann Dipl Ing Fritzsch Analogy rechengeraet
DE2939534B2 (en) * 1979-09-28 1981-06-25 Kraftwerk Union Ag, 4330 Muelheim, De
SU1170177A1 (en) * 1983-07-13 1985-07-30 Предприятие П/Я А-3903 Method of controlling turbine
JPH0364681B2 (en) * 1983-08-17 1991-10-08 Tokyo Shibaura Electric Co
GB2152591B (en) * 1983-12-19 1988-08-24 Gen Electric Steam turbine-generator thermal performance monitor
US4866940A (en) * 1988-07-25 1989-09-19 Westinghouse Electric Corp. Computer aided tuning of turbine controls

Also Published As

Publication number Publication date
AT117407T (en) 1995-02-15
JPH07166810A (en) 1995-06-27
US5201180A (en) 1993-04-13
EP0509347A1 (en) 1992-10-21
JP3148349B2 (en) 2001-03-19

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