JPS59192806A - Stretch-out running of twin-shaft steam turbine and device therefor - Google Patents
Stretch-out running of twin-shaft steam turbine and device thereforInfo
- Publication number
- JPS59192806A JPS59192806A JP6566983A JP6566983A JPS59192806A JP S59192806 A JPS59192806 A JP S59192806A JP 6566983 A JP6566983 A JP 6566983A JP 6566983 A JP6566983 A JP 6566983A JP S59192806 A JPS59192806 A JP S59192806A
- Authority
- JP
- Japan
- Prior art keywords
- pressure turbine
- shaft
- steam
- turbine
- stretch
- 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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、半速機を有する２軸蒸気タービンのストレッ
チアウトラン運転方法、およびその装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a stretch outrun operation method for a two-shaft steam turbine having a half-speed machine, and an apparatus therefor.
従来、一般に、半速機を備えていない蒸気タービン（例
えば高圧タービン、中圧タービン、低圧タービン、及び
２極発電機が一軸に結合されたタンデム型３０００ＲＰ
Ｍ機、３６００ＲＰＭ機や、高圧タービン、低圧タービ
ン、及び２極発重機が一次軸に、中圧タービン、低圧タ
ービン、及び２極発電機が２次軸に結合されたクロスコ
ンパウンド塑３０００ ＲＰ Ｍ ／ ３０００ ＲＰ
Ｍ機）においては、据付後あるいは定期検査後（特に
定期検査時にタービン本体を分解点検した時）の第１回
目起動時にストレッチアウトランを行っている。Conventionally, steam turbines that are generally not equipped with a half-speed machine (for example, a tandem type 3000RP in which a high-pressure turbine, an intermediate-pressure turbine, a low-pressure turbine, and a two-pole generator are coupled to a single shaft)
M machine, 3600RPM machine, and cross compound plastic 3000RPM machine in which a high pressure turbine, a low pressure turbine, and a bipolar generator are connected to the primary shaft, and an intermediate pressure turbine, a low pressure turbine, and a bipolar generator are connected to the secondary shaft. 3000RP
For the M machine), a stretch out run is performed at the first startup after installation or periodic inspection (particularly when the turbine body is disassembled and inspected during periodic inspection).
即ち、タービンの起動後、定格回転速度まで昇速するに
先立って、タービン回転数を約８００〜１１０００ＲＰ
に保ち、排気真空を変化させ低圧タービンの車室を伸縮
させ馴ませる。ストレツチアウド終了後は、機器全体を
均等に暖めるため、引き続き昇速を行うことなく翌日迄
ターニング運転ケ行うのが通常である。That is, after starting the turbine and before increasing the speed to the rated rotation speed, the turbine rotation speed is set to approximately 800 to 11,000 RP.
The low-pressure turbine chamber is expanded and contracted by changing the exhaust vacuum. After the stretcher is finished, turning operation is usually continued until the next day without increasing speed in order to evenly warm up the entire equipment.
しかし本発明の対象とする半速機を有する２軸蒸気ター
ビンにおいては、次の理由によシ、従来技術においては
ストレッチアウトラン運転を行うことが困難であった。However, in a two-shaft steam turbine having a half-speed machine, which is the object of the present invention, it has been difficult to perform stretch outrun operation in the prior art for the following reasons.
即ち、半速機を有する２軸蒸気タービンにおいては、２
次軸の回転数が１次軸の半分となるため、１次タービン
を約８００〜ｔｏＯｏＲＰＭの回転数に保持した場合は
、２次タービン回転数を約４００〜約５０ ＯＲＰＭに
保持することになる。２次軸に結合されている低圧ター
ビン及び発電機の危険速度は約１０００〜１４００ＲＰ
Ｍであシ、２次タービンは危険速度よシ極端に低い回転
数で保持されることになる。この状態でロータと静止体
とのこすれ（ラビング）が生じた場合、接触部が加熱さ
れ、ロータに曲がりアンバランスを生じ振動が発生する
。この局部加熱によるロータの曲がシ変形は、危険速度
よりも相当低い回転数領域において発生するため、ラビ
ングの方向に更に曲がりが加わって振動は上昇し続ける
。ところが、ロータの軸振動を検出する振動計は第１図
に示すごとく約８０ＯＲＰＭ（約１３Ｈ２）以下では感
度を落としである。これは地震時に地震波を振動計が感
知してタービンが不必要にトリップすることを回避する
ためである。（地震波の周波数は約０．１〜約１０Ｈ２
である。）従って上記のラビングによる振動が発生して
も運転員はこれを知ることが出来ず、最悪の場合、ロー
タの永久的りを生ずる危険性があるため、ストレッチア
ウトランが行われていないのである。That is, in a two-shaft steam turbine with a half-speed machine, 2
The rotational speed of the secondary shaft is half that of the primary shaft, so if the primary turbine is maintained at a rotational speed of approximately 800 to OoRPM, the secondary turbine rotational speed will be maintained at approximately 400 to approximately 50 ORPM. . The critical speed of the low pressure turbine and generator connected to the secondary shaft is approximately 1000-1400RP
If M is selected, the secondary turbine will be held at an extremely low rotational speed below the critical speed. If rubbing occurs between the rotor and the stationary body in this state, the contact portion is heated, causing the rotor to bend and become unbalanced, causing vibration. This deformation of the rotor due to local heating occurs in a rotational speed range considerably lower than the critical speed, so the vibration continues to increase as the rotor is further bent in the direction of rubbing. However, as shown in FIG. 1, the sensitivity of the vibrometer for detecting rotor shaft vibration decreases below about 80 ORPM (about 13 H2). This is to prevent the turbine from tripping unnecessarily due to the vibration meter sensing seismic waves during an earthquake. (The frequency of seismic waves is about 0.1 to about 10H2
It is. ) Therefore, even if the vibration caused by the above-mentioned rubbing occurs, the operator is not aware of it, and in the worst case, there is a risk of permanent damage to the rotor, so stretch out run is not performed.
本発明は上述の事情に鑑みて為され、半速機を有する２
軸蒸気タービンプラントにおいて、半速の低圧タービン
及び発電機を直結した２次軸にラビリングを発生せしめ
る處れなくストレッチアウトラン運転を行い得る運転方
法、および、上記の方法を容易に実施してその効果を発
揮せしめ得る運転装置を提供することを目的とする。The present invention has been made in view of the above-mentioned circumstances, and is
An operating method in a shaft steam turbine plant that allows stretch outrun operation to be performed without the risk of causing labyrinth in a secondary shaft directly connected to a half-speed low-pressure turbine and a generator, and the above method can be easily implemented and its effects obtained. The purpose of the present invention is to provide an operating device that can exhibit the following characteristics.
上記の目的を達成するため、本発明の運転方法は、高圧
タービンと中圧タービンと発電機とを相互に直結した１
次軸、並びに、低圧タービンと発電機とを直結した２次
軸とを有する２軸蒸気タービンプラントのストレッチア
ウトラン運転にオイて、中圧タービンの排気蒸気の一部
を、低圧タービンを経由せずに復水器にバイパスさせる
ことを特徴とする。In order to achieve the above object, the operating method of the present invention provides a single unit in which a high-pressure turbine, an intermediate-pressure turbine, and a generator are directly connected to each other.
In stretch outrun operation of a two-shaft steam turbine plant that has a secondary shaft and a secondary shaft that directly connects a low-pressure turbine and a generator, a portion of the exhaust steam from the intermediate-pressure turbine is transferred without going through the low-pressure turbine. It is characterized by bypassing the condenser.
また、本発明の運転装置は上記の本発明方法を容易に使
用してその効果を発揮させるために、高圧タービンと中
圧タービンと発電機とを相互に直結した１次軸、並びに
、低圧タービンと発電気とを直結した２次軸とを有する
２ｉｉ１１蒸気タービンプラントにおいて、中圧タービ
ンの排気口と復水器との間に、ダンプ弁を備えたダンプ
配管を介装接続したことを特徴とする。In addition, in order to easily use the method of the present invention and exhibit its effects, the operating device of the present invention has a primary shaft in which a high pressure turbine, an intermediate pressure turbine, and a generator are directly connected to each other, and a low pressure turbine. In a 2ii11 steam turbine plant having a secondary shaft directly connected to a generator and a power generator, a dump pipe equipped with a dump valve is interposed and connected between the exhaust port of the intermediate pressure turbine and the condenser. do.
次に本発明の一実施例を図面を参照して説明する。 Next, one embodiment of the present invention will be described with reference to the drawings.
第２図は、本発明のストレッチアウトラン運転を実施す
るために構成した２軸蒸気タービンプラントの実施例を
示す。この２軸蒸気タービンプラントは高圧タービン１
、中圧タービン２、及び２極発電機３を結合した１次軸
■、及び、低圧タービン４，５と４極発電機６とを結合
した半速の２次軸且とによって構成されている。FIG. 2 shows an embodiment of a two-shaft steam turbine plant configured to carry out the stretch outrun operation of the present invention. This two-shaft steam turbine plant has a high pressure turbine 1
, a primary shaft (1) that connects an intermediate pressure turbine 2, and a two-pole generator 3, and a half-speed secondary shaft (1) that connects a low-pressure turbine 4, 5 and a four-pole generator 6. .
通常運転時には、ボイラー７から発生した蒸気は加減弁
８を通シ高圧タービン１で仕事を行い、再熱器９で再び
加熱されインターセプト弁１０を通υ中圧タービン２へ
入る。中圧タービン２を出た蒸気はクロスオーバー管１
２を通り低圧タービン４，５へ導びかれ、復水器１３を
経て、ボイラー７へ回収される。During normal operation, steam generated from the boiler 7 passes through the control valve 8 to perform work in the high-pressure turbine 1, is heated again in the reheater 9, and enters the υ medium-pressure turbine 2 through the intercept valve 10. Steam exiting the intermediate pressure turbine 2 passes through the crossover pipe 1
2 to low-pressure turbines 4 and 5, passed through a condenser 13, and recovered to a boiler 7.
上記中圧タービン２の排気部１４と復水器１３との間に
、ダンプ弁１６を設けたダンプ配管１５を介装接続する
。これにより、中圧タービン２の排気蒸気の一部を、低
圧タービン４，５に流通させることなく復水器１３にイ
くイパスさせることができるようになる。A dump pipe 15 provided with a dump valve 16 is interposed and connected between the exhaust section 14 of the intermediate pressure turbine 2 and the condenser 13. Thereby, a part of the exhaust steam of the intermediate pressure turbine 2 can be passed through the condenser 13 without flowing to the low pressure turbines 4 and 5.
上記のように構成したストレッチアウトラン運転装置を
用いてストレッチアウトラン運転を行った１実施例を次
に述べる。An example in which stretch out run operation was performed using the stretch out run operation device configured as described above will be described next.
１次軸Ｉｆｆ：約１１００ＲＰに保持するだけの蒸気を
高圧タービン１と中圧タービン２に流し、ダンプ弁１６
を開ける。このダンプ弁１６は、ストレッチアウトの場
合のみ開くものであって、通常運転の場合は閉止してお
く。該ダンプ弁１６を閉じた状態にしていると、本発明
装置の適用としてダンプ配管１５．ダンプ弁１６を付設
したことは、当該蒸気タービンプラントの機能に何らの
影響を及ぼさない。The steam sufficient to maintain the primary shaft Iff: approximately 1100 RP flows through the high pressure turbine 1 and the intermediate pressure turbine 2, and the dump valve 16
open it. This dump valve 16 is opened only in the case of stretch-out, and is kept closed during normal operation. When the dump valve 16 is in a closed state, the dump piping 15. The addition of the dump valve 16 has no effect on the functionality of the steam turbine plant.
上述のととくダンプ弁１６ｆ、開くと、中圧タービン２
を駆動した蒸気の大部分はダンプ弁１６を通って復水器
１３に流入する。そして、その一部分は低圧タービン４
．５を流通して復水器１３に、） 流入
する。このようにして、１次軸工を駆動する高圧タービ
ン１と中圧タービン２とは約１００ＯＲ，ＰＭでストレ
ッチアウトラン運転され、２次軸■を駆動する低圧ター
ビン４．５は少量の高温蒸気が流通して加温されるが別
設の回転動力を発生しない。When the above-mentioned Totoku dump valve 16f opens, the intermediate pressure turbine 2
Most of the steam that has driven the pump flows into the condenser 13 through the dump valve 16. And a part of it is the low pressure turbine 4
．． 5 and flows into the condenser 13). In this way, the high-pressure turbine 1 and the intermediate-pressure turbine 2 that drive the primary shaft work are operated in stretch outrun at approximately 100 OR, PM, and the low-pressure turbine 4.5 that drives the secondary shaft (■) is operated with a small amount of high-temperature steam. Although it is circulated and heated, it does not generate separate rotational power.
第３図はストレッチアウトラン運転中の１次タービン（
１次軸■を駆動している高、中圧タービンン）の回転数
、復水器真空度、及びダンプ弁１６の開度の関係を示す
。第３図（Ａ）、（Ｂ）。Figure 3 shows the primary turbine (
The relationship between the rotational speed of the high- and medium-pressure turbine (which drives the primary shaft (2)), the degree of vacuum of the condenser, and the opening degree of the dump valve 16 is shown. Figure 3 (A), (B).
（Ｃ１は横軸に共通目盛で時間をとシ、同図（Ａ）の縦
軸には１次タービンの回転数、同図（Ｂ）の縦軸には復
水器真空度、同図（Ｃ）の縦軸にはダンプ弁１６の開度
を、それぞれとっである。(C1 shows time on a common scale on the horizontal axis, the rotation speed of the primary turbine on the vertical axis in the same figure (A), and the condenser vacuum degree on the vertical axis in the same figure (B), The opening degree of the dump valve 16 is plotted on the vertical axis of C).
本発明のストレッチアウトラン運転方法をとることによ
り運転中高温の蒸気にさらされる高圧タービン１、及び
中圧タービン２はストレッチアウトラン中の蒸気によシ
、ケーシングは十分伸ばされ、又ロータは約１０００１
％ Ｐ Ｍで回転していることから静止時に比較し十分
高い蒸気からメタルへの熱伝達によシロータ中心部−１
で暖められ、昇速負荷併入時以降の蒸気温度とメタル温
度のミスマツチを軽減することができる。By adopting the stretch out run operating method of the present invention, the high pressure turbine 1 and the intermediate pressure turbine 2, which are exposed to high temperature steam during operation, are exposed to the steam during the stretch out run, the casing is sufficiently stretched, and the rotor is approximately 10,000 m
% PM Since it rotates at M, the heat transfer from the steam to the metal is much higher than when it is stationary.
It is possible to reduce the mismatch between the steam temperature and the metal temperature after the acceleration load is added.
一方、低圧タービン４，５はターニング運転の状態を継
続し、そのメタル温度あるいは蒸気温度は復水器１３の
真空度に対応する飽和蒸気温度に等しくなる。従って、
復水器真空操作を行って真空度を例えば６５０ｍｍＨｇ
〜７３０ｍｍＨｇｔで変化させた場合、低圧タービンの
温度は約２９０がら約５３Ｃまで変化する。これによシ
低圧タービン４，５を構成している大型の溶接構造物で
あるケーシングを伸ばすことができる。On the other hand, the low pressure turbines 4 and 5 continue their turning operation, and their metal temperature or steam temperature becomes equal to the saturated steam temperature corresponding to the degree of vacuum in the condenser 13. Therefore,
Perform condenser vacuum operation to reduce the degree of vacuum to, for example, 650 mmHg.
When varied from ~730 mmHgt, the low pressure turbine temperature varies from about 290 to about 53C. This allows the casing, which is a large welded structure constituting the low pressure turbines 4, 5, to be extended.
第４図はダンプ弁１６の開閉の条件を示したものであり
、ストレッチアウトラン及びタービンリセットの条件に
加え、１次タービン回転数の榮件を付は加えることによ
シ、通常運転中等にストレッチアウトランのボタン誤操
作等により、不用意にダンプ弁１６が開くことを防止し
ている。Figure 4 shows the conditions for opening and closing the dump valve 16, and in addition to the conditions for stretch out run and turbine reset, by adding or adding conditions for the primary turbine rotation speed, it is possible to perform a stretch operation during normal operation. This prevents the dump valve 16 from being opened inadvertently due to erroneous operation of the outrun button.
以上詳述したように、本発明方法によれば、半速機を有
する２軸蒸気タービンプラントにおいて、２次軸の盲運
転による２ピング振動やロータ曲がと
り変形の危険を冒すことなくストレッチアウト２ン運転
を行うことができる。As described in detail above, according to the method of the present invention, in a two-shaft steam turbine plant having a half-speed machine, stretch-out is possible without risk of two-pin vibration or rotor bending and deformation due to blind operation of the secondary shaft. 2-in operation is possible.
第１図は振動計の計器感度を示す図表、第２図は本発明
装置の一実施例を示す系統図である。第３図（Ａ）はス
トレッチアウトラン運転時の１次タービン回転数を示す
図表、同図（Ｂ）は同じく復水器真空度を示す図表、同
図（Ｃ）は同じくダンプ弁開度を示す図表である。第４
図はダンプ弁の開閉条件を示す図表である。
１・・・高圧タービン、２・・・中圧タービン、４．５
・・・低圧タービン、７・・・ボイラ、８・・・加減弁
、９・・・再熱器、ｌＯ・・・インターセプト弁、１２
・・・クロスオーバー管、１３・・・復水器、１４・・
・中庄排気部、１５・・・ダンプ配管、１６・・・ダン
プ弁、■・・・１次軸、■・・・２次軸。
代理人 弁理士 秋本正実
□FIG. 1 is a chart showing the instrument sensitivity of a vibration meter, and FIG. 2 is a system diagram showing an embodiment of the device of the present invention. Figure 3 (A) is a chart showing the primary turbine rotation speed during stretch outrun operation, Figure 3 (B) is a chart showing the condenser vacuum degree, and Figure 3 (C) is also a chart showing the dump valve opening degree. This is a diagram. Fourth
The figure is a chart showing the opening/closing conditions of the dump valve. 1...High pressure turbine, 2...Intermediate pressure turbine, 4.5
...Low pressure turbine, 7...Boiler, 8...Adjustment valve, 9...Reheater, lO...Intercept valve, 12
...Crossover pipe, 13...Condenser, 14...
- Nakasho exhaust section, 15... dump piping, 16... dump valve, ■... primary shaft, ■... secondary shaft. Agent Patent Attorney Masami Akimoto□
Claims (1)
結した１次軸、並びに、低圧タービンと発電機とを直結
した２次軸とを有する２軸蒸気タービンプラントのスト
レッチアウトラン運転において、中圧タービンの排気蒸
気の一部を、低圧タービンを経由せずに復水器にバイパ
スさせるとと全特徴とする、２軸蒸気タービンのストレ
ッチアウトラン運転方法。 ２、高圧タービンと中圧タービンと発電機とを相互に直
結した１次軸、並びに、低圧タービンと発電機とを直結
した２次軸とを有する２軸蒸気タービンプラントにおい
て、中圧タービンの排気口と復水器との間に、ダンプ弁
を備えたダンプ配管を介装したことを特徴とする、２軸
蒸気タービンのストレッチアウトラン運転装置。[Claims] 1. A two-shaft steam turbine plant having a primary shaft that directly connects a high-pressure turbine, an intermediate-pressure turbine, and a generator, and a secondary shaft that directly connects a low-pressure turbine and a generator. A stretch outrun operating method for a two-shaft steam turbine, the entire feature being that in stretch outrun operation, a part of exhaust steam from an intermediate pressure turbine is bypassed to a condenser without passing through a low pressure turbine. 2. In a two-shaft steam turbine plant that has a primary shaft that directly connects a high-pressure turbine, an intermediate-pressure turbine, and a generator, and a secondary shaft that directly connects a low-pressure turbine and a generator, the exhaust gas of the intermediate-pressure turbine A stretch outrun operating device for a two-shaft steam turbine, characterized in that a dump pipe equipped with a dump valve is interposed between a port and a condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6566983A JPS59192806A (en) | 1983-04-15 | 1983-04-15 | Stretch-out running of twin-shaft steam turbine and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6566983A JPS59192806A (en) | 1983-04-15 | 1983-04-15 | Stretch-out running of twin-shaft steam turbine and device therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59192806A true JPS59192806A (en) | 1984-11-01 |
| JPS6361483B2 JPS6361483B2 (en) | 1988-11-29 |
Family
ID=13293633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6566983A Granted JPS59192806A (en) | 1983-04-15 | 1983-04-15 | Stretch-out running of twin-shaft steam turbine and device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59192806A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017522483A (en) * | 2014-06-04 | 2017-08-10 | シーメンス アクティエンゲゼルシャフト | Method for warming up or keeping warm of steam turbine |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101866U (en) * | 1989-02-01 | 1990-08-14 | ||
| JPH02101867U (en) * | 1989-02-01 | 1990-08-14 | ||
| JP5818459B2 (en) * | 2011-02-25 | 2015-11-18 | 三菱重工業株式会社 | Steam turbine drive machine, ship equipped with steam turbine drive machine, and gas liquefaction device |
-
1983
- 1983-04-15 JP JP6566983A patent/JPS59192806A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017522483A (en) * | 2014-06-04 | 2017-08-10 | シーメンス アクティエンゲゼルシャフト | Method for warming up or keeping warm of steam turbine |
| US10100665B2 (en) | 2014-06-04 | 2018-10-16 | Siemens Aktiengesellschaft | Method for heating up a steam turbine or for keeping a steam turbine hot |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6361483B2 (en) | 1988-11-29 |
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