EP1319117A1 - Method for regulating a steam turbine, and corresponding steam turbine - Google Patents
Method for regulating a steam turbine, and corresponding steam turbineInfo
- Publication number
- EP1319117A1 EP1319117A1 EP01983470A EP01983470A EP1319117A1 EP 1319117 A1 EP1319117 A1 EP 1319117A1 EP 01983470 A EP01983470 A EP 01983470A EP 01983470 A EP01983470 A EP 01983470A EP 1319117 A1 EP1319117 A1 EP 1319117A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- valves
- steam turbine
- valve
- output signal
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- 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
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for 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
- 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
- F05D2270/05—Purpose of the control system to affect the output of the engine
Definitions
- the invention relates to a method for regulating a steam turbine, in which steam is fed to the steam turbine via at least three valves.
- the invention further relates to a steam turbine with a valve group for regulating the steam inlet.
- a method for controlling a steam turbine emerges from the article "Practical design of speed and power regulators for steam turbines" by Johannes Dastych and Heinz Unbehauen, Martin Bennauer and Heribert Werthes, ATP 41 (1999), No. 5.
- a steam turbine is based on speed or power regulated.
- the control circuit for speed and power according to Figure 2 consists of function blocks such as speed / power controller (D- / LR), live steam control valve (FD-STV), interception control valve (AF-STV), steam generator (DE) and turbine (T) as well elementary blocks, such as Constant, ramp and
- the turbo set is supplied with steam from a steam generator, the steam supply being regulated via control valves in such a way that the necessary power is available.
- the speed and the power are regulated via a common speed / power controller both for load operation with selectable statics and for regulating the speed when idling.
- the output signal of the speed / power controller acts on the live steam and interception control valves.
- Such a control of a steam turbine requires a very complex control circuit as well as control valves which allow a sufficiently fast control. So far, only hydraulically driven control valves for steam inlet control have been used, since a sufficiently rapid adjustment of the valve lift is only possible via such a hydraulic drive.
- control valve lift set a certain value of their valve lift.
- the maintenance of a control difference value of approximately zero is carried out by one, possibly also several, control valves. This means that at least two control valves can be replaced by much simpler control valves, which considerably simplifies the control circuit.
- control valves are preferably driven by an electric motor.
- An electric motor drive offers considerable cost advantages over an electro-hydraulic drive, for example.
- the risk of fire is reduced by the absence of hydraulic oil.
- the lower dynamic range of the electromotive drive is also sufficient for use in the control process.
- Control valves works together. With regard to improved availability, however, it is advantageous to use two control valves and two control valves.
- the method is preferably designed when the steam turbine is consuming power so that the control valve first opens and one of the control valves opens when a predetermined first value of a controller output signal used for controlling the control valve is exceeded and when there is a positive control difference.
- the first value is more preferably approximately a quarter of the maximum controller output signal.
- the positive control difference indicates that the desired value for the power or the speed has not yet been reached.
- the second output value of the controller output signal is exceeded and if there is a positive the second control valve.
- the second value of the controller output signal is larger than the first value of the controller output signal.
- a further stage in power consumption is thus reached in which the third valve, namely the second control valve, is switched on.
- the second value of the controller output signal is more preferably approximately half the maximum value of the controller output signal.
- the second control valve opens when a third value of the controller output signal is exceeded and when there is a positive control difference.
- the third value of the controller output signal is above the value of the second value of the controller output signal.
- a further stage in the power consumption of the steam turbine is thus reached, in which the second control valve is activated. With a controller output signal of 100%, all valves are fully open.
- the control difference indicates the difference between the setpoint and the actual value of the speed or the power of the steam turbine. If there is a large control difference, the control valves are moved into their target position at high speed. With a smaller control difference, a lower actuating speed is sufficient.
- a frequency converter in particular, can specify the setting direction for the control valves depending on the sign of the control difference.
- the object directed at a steam turbine is achieved according to the invention by specifying a steam turbine with a valve. til michange for regulating the steam inlet, which valve group comprises a control valve and at least two control valves.
- the control valves preferably have an electric motor drive.
- FIG 1 shows schematically a steam turbine system.
- a steam turbine 1 is supplied with steam from a steam generator 3 via the feed line 5.
- a valve group 7 is installed in the supply line 5.
- the valve group 7 comprises a first control valve 9 and a second control valve 11.
- the valve group 7 further comprises a first control valve 13 and a second control valve 15.
- the amount of steam introduced into the steam turbine 1 is regulated via the valve group 7. This takes place as a function of the power or speed desired for the steam turbine 1. This is explained in more detail with reference to FIGS. 2 and 3.
- Figure 2 shows the valve group 7 from Figure 1 with the associated control circuit.
- a controller 21 generates a controller output signal identifying a control difference.
- the controller output signal is fed to a first servo amplifier 23 of the first control valve 9.
- the controller output signal is also fed to a second servo amplifier 27 of the second control valve 11.
- the controller output signal is also fed to a first frequency converter 25 of the first control valve 13.
- the controller output signal is also fed to a second frequency converter 29 of the second control valve 15.
- FIG. 3 shows an example of the valve lift of each of the valves 9, 11, 13, 15 as a function of the controller output signal in a diagram. The information is shown in percent of the respective maximum value.
- the characteristic curve 9K indicates the course of the valve lift 33 of the first regulator valve 9 as a function of the regulator output signal 31.
- the characteristic curve 13K indicates the corresponding characteristic curve for the first control valve 13.
- the characteristic curve 11K indicates the corresponding characteristic curve for the second control valve 11.
- the characteristic curve 15K indicates the corresponding characteristic curve for the second control valve 15.
- the first control valve 9 opens in proportion to the size of the controller output signal 31. At a value of 22.5% of the controller output signal 31, the first control valve 13 opens.
- the valve lift 33 is for the first control valve 9 and for the first control valve 13 at 100%. From this point on, the second control valve 11 opens. At a value of 72.5%, the second control valve 15 is finally switched on. At a value of 100% of the controller output signal 31, all valves 9, 11, 13, 15 are completely open.
- the first control valve 9 is used for starting, ramping up to the nominal speed and synchronization.
- the size of the control difference determines the opening speed of the control valves 13, 15 to a negative control difference.
- the size of the negative control difference determines the closing speed of the control valves. Because of the lower control dynamics of the control valves, which are driven by an electric motor in the example shown, the response value for a "closing" switching operation when the load is shed can be different for the control valves 9, 11 and the control valves 13, 15.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01983470A EP1319117B1 (en) | 2000-09-20 | 2001-09-07 | Method for regulating a steam turbine, and corresponding steam turbine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00120574A EP1191190A1 (en) | 2000-09-20 | 2000-09-20 | Method for regulating a steam turbine and steam turbine |
EP00120574 | 2000-09-20 | ||
PCT/EP2001/010358 WO2002025067A1 (en) | 2000-09-20 | 2001-09-07 | Method for regulating a steam turbine, and corresponding steam turbine |
EP01983470A EP1319117B1 (en) | 2000-09-20 | 2001-09-07 | Method for regulating a steam turbine, and corresponding steam turbine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1319117A1 true EP1319117A1 (en) | 2003-06-18 |
EP1319117B1 EP1319117B1 (en) | 2010-06-02 |
Family
ID=8169887
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00120574A Withdrawn EP1191190A1 (en) | 2000-09-20 | 2000-09-20 | Method for regulating a steam turbine and steam turbine |
EP01983470A Expired - Lifetime EP1319117B1 (en) | 2000-09-20 | 2001-09-07 | Method for regulating a steam turbine, and corresponding steam turbine |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00120574A Withdrawn EP1191190A1 (en) | 2000-09-20 | 2000-09-20 | Method for regulating a steam turbine and steam turbine |
Country Status (6)
Country | Link |
---|---|
EP (2) | EP1191190A1 (en) |
JP (1) | JP4695822B2 (en) |
CN (1) | CN100335751C (en) |
DE (1) | DE50115502D1 (en) |
ES (1) | ES2344591T3 (en) |
WO (1) | WO2002025067A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1528446A1 (en) * | 2003-10-29 | 2005-05-04 | Siemens Aktiengesellschaft | Method and controller for positioning an actuator and use of the controller |
DE102005033292B4 (en) * | 2005-07-16 | 2007-07-26 | I.N.T.-Rickert GmbH Ingenieurbüro für neue Technologien | Device for applying adhesives or sealants |
JP2013079580A (en) * | 2011-09-30 | 2013-05-02 | Toshiba Corp | Method of operating combined power generating facility and combined power generating facility |
CN103244203B (en) * | 2013-05-21 | 2014-12-03 | 国家电网公司 | Throttle valve system and working method thereof |
CN108252752B (en) * | 2017-12-22 | 2020-05-12 | 东方电气集团东方汽轮机有限公司 | Steam turbine steam inlet adjusting method |
WO2019217632A1 (en) | 2018-05-09 | 2019-11-14 | Abb Schweiz Ag | Turbine control system |
CN109356674A (en) * | 2018-12-25 | 2019-02-19 | 大庆特博科技发展有限公司 | A kind of organic working medium turbine of adjustable nozzle quantity |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE272691C (en) * | ||||
NL26523C (en) * | 1926-08-28 | 1900-01-01 | ||
NL29786C (en) * | 1929-12-30 | 1932-12-15 | ||
FR787271A (en) * | 1934-06-21 | 1935-09-19 | Rateau Sa | Steam or gas turbine adjustment device |
US3763894A (en) * | 1971-06-16 | 1973-10-09 | Westinghouse Electric Corp | Sequentially operable control valve for a steam turbine |
US4245162A (en) * | 1973-08-15 | 1981-01-13 | Westinghouse Electric Corp. | Steam turbine power plant having improved testing method and system for turbine inlet valves associated with downstream inlet valves preferably having feedforward position managed control |
AU537607B2 (en) * | 1980-12-02 | 1984-07-05 | Hitachi Limited | Combined valve for use in a reheating steam turbine |
JPS57188705A (en) * | 1981-05-15 | 1982-11-19 | Toshiba Corp | Steam turbine |
US4604028A (en) * | 1985-05-08 | 1986-08-05 | General Electric Company | Independently actuated control valves for steam turbine |
JPH0261101U (en) * | 1988-10-26 | 1990-05-07 | ||
DE19616178C2 (en) * | 1995-07-14 | 1998-07-16 | Ver Energiewerke Ag | Method for loading and unloading the high pressure part of a steam turbine operated with a duo steam boiler block |
WO1998013633A1 (en) * | 1996-09-26 | 1998-04-02 | Siemens Aktiengesellschaft | Turbine valve actuator |
-
2000
- 2000-09-20 EP EP00120574A patent/EP1191190A1/en not_active Withdrawn
-
2001
- 2001-09-07 EP EP01983470A patent/EP1319117B1/en not_active Expired - Lifetime
- 2001-09-07 CN CNB018159753A patent/CN100335751C/en not_active Expired - Fee Related
- 2001-09-07 JP JP2002529646A patent/JP4695822B2/en not_active Expired - Fee Related
- 2001-09-07 WO PCT/EP2001/010358 patent/WO2002025067A1/en active Application Filing
- 2001-09-07 ES ES01983470T patent/ES2344591T3/en not_active Expired - Lifetime
- 2001-09-07 DE DE50115502T patent/DE50115502D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0225067A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004518050A (en) | 2004-06-17 |
EP1319117B1 (en) | 2010-06-02 |
DE50115502D1 (en) | 2010-07-15 |
WO2002025067A1 (en) | 2002-03-28 |
CN100335751C (en) | 2007-09-05 |
JP4695822B2 (en) | 2011-06-08 |
CN1461374A (en) | 2003-12-10 |
EP1191190A1 (en) | 2002-03-27 |
ES2344591T3 (en) | 2010-09-01 |
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