JP3307124B2 - Bleed steam turbine - Google Patents
Bleed steam turbineInfo
- Publication number
- JP3307124B2 JP3307124B2 JP31143294A JP31143294A JP3307124B2 JP 3307124 B2 JP3307124 B2 JP 3307124B2 JP 31143294 A JP31143294 A JP 31143294A JP 31143294 A JP31143294 A JP 31143294A JP 3307124 B2 JP3307124 B2 JP 3307124B2
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pressure section
- valve
- bleed
- control valve
- 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 - Fee Related
Links
Landscapes
- Control Of Turbines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、翼段落の途中から抽気
した抽気蒸気の圧力を制御する抽気加減弁を備える抽気
蒸気タービンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bleed steam turbine provided with a bleed control valve for controlling the pressure of bleed steam extracted in the middle of a blade stage.
【０００２】[0002]
【従来の技術】翼段落を有する高圧部と低圧部とを備
え、高圧部の排気蒸気から抽気した抽気蒸気の圧力を、
低圧部の蒸気入口に設けた抽気加減弁によりプロセスの
要求する所定圧力に制御する抽気蒸気タービンとして図
３に示す系統のものが知られている。2. Description of the Related Art A high-pressure section having a blade stage and a low-pressure section are provided.
A system shown in FIG. 3 is known as a bleed steam turbine which controls a predetermined pressure required by a process by a bleed control valve provided at a steam inlet of a low-pressure section.
【０００３】図３において、抽気蒸気タービン１は、そ
の本体が翼段落を有する高圧部２及びこの高圧部２に続
く翼段落を有する低圧部３からなり、高圧部２の排気室
に接続して高圧部２の排気蒸気から抽気した抽気蒸気を
プロセス５に供給する抽気供給系６が設けられている。
高圧部２の蒸気入口には高圧部２に流入する主蒸気の蒸
気量を制御する主蒸気加減弁７が設けられ、一方低圧部
３の蒸気入口にはプロセス５に供給する抽気蒸気の圧力
を制御する抽気加減弁８が設けられている。[0003] In FIG. 3, an extraction steam turbine 1 has a main body composed of a high pressure section 2 having a blade stage and a low pressure section 3 having a blade stage following the high pressure section 2, and connected to an exhaust chamber of the high pressure section 2. An extraction supply system 6 that supplies extracted steam extracted from exhaust steam of the high-pressure section 2 to the process 5 is provided.
The steam inlet of the high-pressure section 2 is provided with a main steam control valve 7 for controlling the amount of main steam flowing into the high-pressure section 2, while the steam inlet of the low-pressure section 3 controls the pressure of the extracted steam supplied to the process 5. A bleed control valve 8 to be controlled is provided.
【０００４】回転速度検出器１０はタービンロータ１１
に設けられ、タービンロータ１１の回転速度を検出す
る。抽気圧力検出器１２は抽気供給系６に設けられ、プ
ロセス５に供給する抽気蒸気の圧力を検出する。調速装
置１４は回転速度検出器１０でのタービンロータ１１の
検出回転速度の信号と抽気圧力検出器１２での抽気蒸気
の検出圧力の信号とが入力され、主蒸気加減弁７，抽気
加減弁８を制御してタービンロータ１１の回転速度の制
御，タービンの負荷及び抽気負荷に対応する蒸気量を制
御するとともに、抽気加減弁８の制御によりプロセス５
に供給する抽気圧力をプロセスの要求する所定圧力に制
御する。[0004] The rotation speed detector 10 includes a turbine rotor 11.
And detects the rotational speed of the turbine rotor 11. The bleed pressure detector 12 is provided in the bleed supply system 6 and detects the pressure of the bleed steam supplied to the process 5. The speed control device 14 receives the signal of the detected rotation speed of the turbine rotor 11 at the rotation speed detector 10 and the signal of the detected pressure of the extracted steam at the bleed pressure detector 12, and receives the main steam control valve 7, the bleed control valve. 8 to control the rotation speed of the turbine rotor 11, the steam load corresponding to the turbine load and the bleed load, and control the process 5 by controlling the bleed control valve 8.
Is controlled to a predetermined pressure required by the process.
【０００５】このような構成により、主蒸気供給系１５
を経た主蒸気は、調速装置１４の制御作用により弁開度
が制御される主蒸気加減弁７によりタービン負荷及び抽
気負荷に対応する蒸気量に制御されて高圧部２に流入し
て仕事をする。そして、高圧部２の排気蒸気から抽気し
た抽気蒸気はプロセス５に供給され、その圧力は、調速
装置１４により抽気圧力検出器１２での検出圧力がプロ
セス５の要求する所定圧力になるように抽気加減弁８に
より制御される。なお、抽気した残りの高圧部２の排気
蒸気は低圧部３に流入して仕事をした後、排気系１６を
経て外部に排出される。そして、高圧部２，低圧部３を
流れた蒸気の仕事量に対応したタービン負荷、例えばタ
ービンに直結する発電機から電力を発生する。With this configuration, the main steam supply system 15
The main steam that has passed through is controlled by the main steam control valve 7 whose valve opening is controlled by the control action of the governing device 14 to a steam amount corresponding to the turbine load and the bleed load, and flows into the high-pressure section 2 to perform work. I do. Then, the extracted steam extracted from the exhaust steam of the high-pressure section 2 is supplied to the process 5, and the pressure is adjusted by the speed control device 14 such that the pressure detected by the extracted pressure detector 12 becomes the predetermined pressure required by the process 5. It is controlled by a bleed control valve 8. The extracted exhaust steam from the high-pressure section 2 flows into the low-pressure section 3 to perform work, and is then discharged to the outside via an exhaust system 16. Then, electric power is generated from a turbine load corresponding to the work amount of the steam flowing through the high-pressure section 2 and the low-pressure section 3, for example, a generator directly connected to the turbine.
【０００６】ところで、抽気蒸気タービン１が負荷遮断
した場合、調速装置１４の制御作用により、一旦は主蒸
気加減弁７と抽気加減弁８とは全閉するが、無負荷運転
時のタービンロータ１１を整定回転速度に保持するため
に、主蒸気加減弁７のみが、タービンの無負荷運転に必
要な蒸気流量が流れる分の開度が開いて主蒸気加減弁７
を通過した主蒸気が高圧部２を流れてタービンロータ１
１を回転させるが、抽気加減弁８は全閉のままである。
なお、この際、高圧部２の排気蒸気は抽気供給系６の方
に流れる。When the load of the bleed steam turbine 1 is interrupted, the main steam control valve 7 and the bleed control valve 8 are once completely closed by the control action of the governing device 14, but the turbine rotor during no load operation is operated. In order to maintain the rotation speed of the main steam control valve 11 at a set rotation speed, only the main steam control valve 7 is opened by an amount corresponding to the flow rate of steam required for the no-load operation of the turbine.
Main steam passing through the high-pressure section 2 flows through the turbine rotor 1
1, but the bleed control valve 8 remains fully closed.
At this time, the exhaust steam of the high-pressure section 2 flows toward the bleed air supply system 6.
【０００７】しかしながら、この状態では抽気加減弁８
より下流の低圧部３には蒸気が流れないため、タービン
ロータ１１の回転により低圧部３の翼段落部の温度が過
度に上昇し、ケーシング，タービンロータの熱変形，熱
膨脹により、翼等のラビングや振動が生じる。したがっ
て、従来、低圧部３の翼段落部の温度上昇を防ぐため、
図４に示すような手段が施されている。However, in this state, the bleed control valve 8
Since steam does not flow to the low-pressure section 3 further downstream, the temperature of the blade section of the low-pressure section 3 excessively rises due to the rotation of the turbine rotor 11, and rubbing of the blades and the like occurs due to thermal deformation and thermal expansion of the casing and the turbine rotor. And vibration occur. Therefore, conventionally, in order to prevent a rise in the temperature of the blade section of the low-pressure section 3,
Means as shown in FIG. 4 are provided.
【０００８】図４は油圧シリンダと、これにより開閉さ
れる抽気加減弁の主要部の構成を模式的に示した構成図
であり、図を用いて従来技術について説明する。図４に
おいて、抽気加減弁８は主要部として弁体２０と、弁体
２０に接続する弁棒２１と、弁体２０が着座する弁座２
２と、弁体２０及び弁座２２を収納し、弁棒２１の往復
動時、弁棒２１を囲むグランドパッキンを収納する案内
部２３を備えた弁箱２４とから構成されている。ここ
で、弁体２０には弁箱２４内に流入した蒸気を弁座２２
の弁出口２６に流入させる冷却蒸気孔２７が設けられて
いる。FIG. 4 is a configuration diagram schematically showing a configuration of a hydraulic cylinder and a main part of a bleed control valve which is opened and closed by the hydraulic cylinder. The prior art will be described with reference to the drawings. In FIG. 4, the bleeding control valve 8 includes a valve body 20 as a main part, a valve rod 21 connected to the valve body 20, and a valve seat 2 on which the valve body 20 is seated.
2 and a valve box 24 having a guide 23 for accommodating the gland packing surrounding the valve stem 21 when the valve stem 21 reciprocates. Here, the steam flowing into the valve box 24 is applied to the valve body 20 by the valve seat 22.
A cooling steam hole 27 for flowing into the valve outlet 26 is provided.
【０００９】油圧シリンダ３０は、ロッド３１とピスト
ン３２とからなるピストンロッド３３、並びにピストン
ロッド３３のピストン３２を囲む筒体３４と、ロッド３
１が貫通する上板３５と、下板３６とからなるシリンダ
３７からなり、シリンダ３７の上部，下部にそれぞれ圧
油を給排する給排管３８，３９が接続されている。な
お、油圧シリンダ３０のピストンロッド３３のロッド３
１と抽気加減弁８の弁棒２１とに支点４０の回りを回動
するレバー４１がピン結合により接続されている。The hydraulic cylinder 30 comprises a piston rod 33 composed of a rod 31 and a piston 32, a cylinder 34 surrounding the piston 32 of the piston rod 33, and a rod 3.
A cylinder 37 is composed of an upper plate 35 through which the tube 1 penetrates and a lower plate 36. Supply and discharge pipes 38 and 39 for supplying and discharging pressure oil are connected to upper and lower portions of the cylinder 37, respectively. The rod 3 of the piston rod 33 of the hydraulic cylinder 30
A lever 41 that rotates around a fulcrum 40 is connected to the valve 1 and the valve rod 21 of the bleed control valve 8 by pin coupling.
【００１０】このような構成により、負荷遮断後の無負
荷運転時、前述のように主蒸気加減弁７の開度によりタ
ービンロータ１１は整定回転速度に制御されるが、抽気
加減弁８は全閉になる。この抽気加減弁８の全閉は下記
のようにして行なわれる。調速装置１４の制御作用によ
り、圧油は油圧シリンダ３０に給排管３８，３９を経て
給排され、ピストンロッド３３は上方に移動する。この
ピストンロッド３３の移動によりレバー４１を介して抽
気加減弁８の弁体２０は弁座２２に着座し、弁は全閉と
なる。With such a configuration, during the no-load operation after the load is cut off, the turbine rotor 11 is controlled to the set rotation speed by the opening degree of the main steam control valve 7 as described above. Close. The bleeding control valve 8 is fully closed as follows. Under the control of the speed control device 14, the pressure oil is supplied to and discharged from the hydraulic cylinder 30 through the supply and discharge pipes 38 and 39, and the piston rod 33 moves upward. By the movement of the piston rod 33, the valve body 20 of the bleeding control valve 8 is seated on the valve seat 22 via the lever 41, and the valve is fully closed.
【００１１】上記のような抽気加減弁８の全閉状態にお
いて、タービンロータ１１を整定回転速度にするために
主蒸気加減弁７から高圧部２に流入して仕事をした後の
高圧部２からの排気蒸気は、抽気加減弁８の弁体２０に
設けられた冷却蒸気孔２７から低圧部３に流入して流
れ、低圧部３の翼段落部を冷却する。In the fully closed state of the bleed control valve 8 as described above, in order to set the turbine rotor 11 at a set rotation speed, the high-pressure section 2 after flowing into the high-pressure section 2 from the main steam control valve 7 and performing work. The exhaust steam flows into the low-pressure section 3 from the cooling steam hole 27 provided in the valve body 20 of the bleed control valve 8, and cools the blade section of the low-pressure section 3.
【００１２】[0012]
【発明が解決しようとする課題】負荷遮断時後、タービ
ンロータの整定回転速度の保持時、抽気加減弁８は前述
のように全閉になるが、このとき抽気蒸気タービン１の
低圧部３の翼段落部を冷却するために、抽気加減弁８の
弁体２０に設けられた冷却蒸気孔２７を経由して高圧部
２の排気蒸気を低圧部３に流入させている。After the load is cut off, when the turbine rotor is kept at the set rotation speed, the bleed control valve 8 is fully closed as described above. At this time, the low-pressure section 3 of the bleed steam turbine 1 is closed. In order to cool the blade stage section, the exhaust steam of the high-pressure section 2 flows into the low-pressure section 3 via a cooling steam hole 27 provided in the valve body 20 of the bleed control valve 8.
【００１３】しかしながら、冷却蒸気孔２７の大きさは
弁体２０の構造により制約されるので、冷却蒸気量が制
限され、大量の冷却蒸気量が必要とする場合には対応で
きないという問題がある。本発明の目的は、負荷遮断後
のタービンロータの整定回転速度の保持時、抽気蒸気タ
ービンの低圧部の翼段落部を、抽気加減弁を経て供給さ
れる高圧部の排気蒸気により冷却する際、冷却蒸気量が
制約されずに冷却できる抽気蒸気タービンを提供するこ
とである。However, since the size of the cooling steam hole 27 is limited by the structure of the valve body 20, the amount of cooling steam is limited, and there is a problem that it is impossible to cope with a case where a large amount of cooling steam is required. An object of the present invention is to cool the blade stage section of the low-pressure section of the extraction steam turbine by exhaust steam of the high-pressure section supplied through the extraction control valve when maintaining the settling speed of the turbine rotor after load interruption. An object of the present invention is to provide a bleed steam turbine capable of cooling without limiting the amount of cooling steam.
【００１４】[0014]
【課題を解決するための手段】前記の課題を達成するた
めに、この発明は、翼段落を有する高圧部及び低圧部
と、高圧部の蒸気入口に設けられ、高圧部に流入する蒸
気量を制御する主蒸気加減弁と、高圧部の排気蒸気が流
入する低圧部の蒸気入口に設けられ、前記排気蒸気から
抽気した抽気蒸気の圧力を制御し、油圧シリンダのピス
トンロッドの往復動によりレバー機構を介して弁棒を往
復動させて弁開度を得る抽気加減弁とを備える抽気蒸気
タービンであって、負荷遮断後にタービンロータを整定
回転速度に保持する時に、低圧部の翼段落を冷却するに
足る高圧部からの排気蒸気の蒸気量が流れる弁開度に抽
気加減弁の弁棒位置を機械的に制限する開度制限手段を
設けたものにおいて、前記の開度制限手段が、油圧シリ
ンダのピストンロッドのピストンをシリンダの上板又は
下板に接触させてピストンロッドの動きを制限する油圧
シリンダの構造であることを特徴とする。また、開度制
限手段を、抽気加減弁の弁箱の弁棒案内部の端面に接触
させるように弁棒に設けた突起体から構成することもで
きる。 Means for Solving the Problems To achieve the above object,
For this purpose, the present invention provides a high-pressure section and a low-pressure section having blade stages, a main steam control valve provided at a steam inlet of the high-pressure section to control the amount of steam flowing into the high-pressure section, and exhaust steam of the high-pressure section flowing into the high-pressure section. Is provided at the steam inlet of the low-pressure section to control the pressure of the extracted steam extracted from the exhaust steam, and reciprocate the valve rod via the lever mechanism by the reciprocation of the piston rod of the hydraulic cylinder to obtain the valve opening. A bleed steam turbine with a bleed control valve, setting the turbine rotor after the load is cut off
When maintaining the rotation speed, cooling the wing stage in the low pressure section
Extract the valve opening to allow sufficient amount of exhaust steam from the high pressure section to flow.
Opening restriction means that mechanically restricts the valve stem position of the
In the above-mentioned arrangement, the opening degree limiting means is provided with a hydraulic series.
The piston of the piston rod of the cylinder
Hydraulic pressure that restricts piston rod movement by contacting the lower plate
It is characterized by a cylinder structure. Also, the opening system
Contact the end face of the valve stem guide section of the valve box of the bleed control valve
It can also be composed of a projection provided on the valve stem to make it
Wear.
【００１５】[0015]
【００１６】[0016]
【作用】翼段落を有する高圧部及び低圧部と、高圧部の
蒸気入口に高圧部に流入する蒸気量を制御する主蒸気加
減弁と、低圧部の蒸気入口に高圧部の排気蒸気から抽気
した抽気蒸気の圧力を制御する抽気加減弁とを備える抽
気蒸気タービンにおいて、タービンの負荷が喪失する負
荷遮断後の無負荷運転時、タービンロータを整定回転速
度に保持するために、主蒸気加減弁は、前記整定回転速
度を保持するに必要な蒸気量が高圧部に流れる開度に開
き、蒸気が高圧部に流れて翼段落にて仕事をする。The high-pressure section and low-pressure section having a blade stage, a main steam control valve for controlling the amount of steam flowing into the high-pressure section at the high-pressure section steam inlet, and the high-pressure section exhaust steam extracted at the low-pressure section steam inlet. In an extraction steam turbine provided with an extraction valve which controls the pressure of the extraction steam, in the no-load operation after the load is cut off when the load on the turbine is lost, the main steam valve is used to maintain the turbine rotor at a set rotation speed. The amount of steam necessary to maintain the set rotation speed opens to an opening where the steam flows to the high-pressure section, and the steam flows to the high-pressure section to work in the blade stage.
【００１７】一方、負荷遮断時、抽気加減弁は全閉の方
向に次記の要領で向う。すなわち、抽気加減弁は、油圧
シリンダのピストンロッドの移動により、レバー機構を
介して抽気加減弁の弁棒を移動させ、弁を閉方向に向わ
せる。この際、弁の開度は、低圧部の翼段落を冷却する
に足る蒸気量が流れるように開度制限手段により弁棒位
置を制限する。On the other hand, when the load is cut off, the bleed control valve is directed in the fully closed direction in the following manner. In other words, the bleed control valve moves the valve rod of the bleed control valve via the lever mechanism by moving the piston rod of the hydraulic cylinder, and turns the valve in the closing direction. At this time, the opening degree of the valve is limited by the opening degree limiting means so that a sufficient amount of steam flows to cool the blade stage in the low-pressure section.
【００１８】ここで、上記の開度制限手段は、油圧シリ
ンダのピストンロッドのピストンの移動を制限する、す
なわち、ピストンロッドのピストンを油圧シリンダのシ
リンダの上板又は下板に接触させたり、また、抽気加減
弁の弁棒に突起体を設け、この突起体が弁箱の弁棒案内
部の端面に接触させることにより、負荷遮断後のタービ
ンロータの整定回転速度の保持時、抽気加減弁は前述の
ような弁開度に保たれ、高圧部の排気蒸気がこの弁開度
から低圧部に流入して低圧部の翼段落を冷却する。Here, the opening restriction means restricts the movement of the piston of the piston rod of the hydraulic cylinder, that is, makes the piston of the piston rod contact the upper or lower plate of the cylinder of the hydraulic cylinder, or By providing a projection on the valve stem of the bleed control valve, and by contacting the protrusion with the end face of the valve stem guide portion of the valve box, the bleed control valve is maintained when the turbine rotor is set at the set rotation speed after the load is cut off. The valve opening is maintained as described above, and the exhaust steam of the high pressure section flows into the low pressure section from this valve opening to cool the blade stage of the low pressure section.
【００１９】[0019]
【実施例】以下図面に基づいて本発明の実施例について
説明する。図１は本発明の実施例による油圧シリンダ
と、これにより開閉される抽気加減弁の主要部の構成を
模式的に示した構成図である。なお、図１及び後述する
図２において、図３，図４の従来例と同一部品には同じ
符号を付し、その説明を省略する。図１において図４の
従来例と異なるのは下記の通りであり、図３を参照しな
がら説明する。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram schematically showing a configuration of a hydraulic cylinder according to an embodiment of the present invention and a main part of a bleeding control valve which is opened and closed by the hydraulic cylinder. 1 and FIG. 2 to be described later, the same components as those of the conventional example of FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof will be omitted. 1 is different from the conventional example of FIG. 4 as follows, and will be described with reference to FIG.
【００２０】油圧シリンダ３０のピストンロッド３３の
ピストン４２をシリンダ３７の上板３５に接触させてピ
ストンロッド３３の位置を制限する。そして、ピストン
ロッド３３のこの制限位置でレバー４１を介して定まる
抽気加減弁８の弁体２０の弁開度を、タービンの負荷遮
断後の無負荷運転時のタービンロータ１１の整定回転速
度に保持時、高圧部２の排気蒸気が低圧部３の翼段落部
を冷却するに足る蒸気量が流れる開度にする。The position of the piston rod 33 is limited by bringing the piston 42 of the piston rod 33 of the hydraulic cylinder 30 into contact with the upper plate 35 of the cylinder 37. The valve opening of the valve body 20 of the bleed control valve 8 determined via the lever 41 at this restricted position of the piston rod 33 is maintained at the set rotation speed of the turbine rotor 11 during the no-load operation after the load is cut off from the turbine. At this time, the opening is set such that the amount of steam enough for the exhaust steam of the high pressure section 2 to cool the blade section of the low pressure section 3 flows.
【００２１】ここで、ピストン４２はその上下の面に環
状の溝４２ａを設け、ピストン４２がシリンダ３７の上
板３５や下板３６に接触したとき給排管３８，３９に圧
油が給排できるようにしている。このような構成によ
り、負荷遮断後、前述のように調速装置１４の制御作用
により主蒸気加減弁７から無負荷運転時のタービンロー
タ１１の整定回転速度を保持するに足る蒸気量が高圧部
の翼段落に流れて仕事をする。一方、負荷遮断時には抽
気加減弁８は前述のように油圧シリンダ３０への圧油の
給排により、レバー４１を介して弁棒２１を下方向に移
動させて閉方向に向わせるが、油圧シリンダ３０のピス
トンロッド３３のピストン４２はシリンダ３７の上板３
５に接触してその位置が制限され、このピストン４２の
位置で、抽気加減弁８の弁体２０は前述の弁開度を保
つ。したがって、この抽気加減弁８の弁開度から高圧部
２の排気蒸気が低圧部３に流入して低圧部３の翼段落部
を冷却する。The piston 42 is provided with annular grooves 42a on the upper and lower surfaces thereof, and when the piston 42 comes into contact with the upper plate 35 and the lower plate 36 of the cylinder 37, pressure oil is supplied to and discharged from the supply and discharge pipes 38 and 39. I can do it. With such a configuration, after the load is cut off, the amount of steam sufficient to maintain the set rotation speed of the turbine rotor 11 during the no-load operation from the main steam control valve 7 by the control action of the governor 14 as described above is increased. Work in the wing paragraph. On the other hand, when the load is cut off, the bleeding control valve 8 moves the valve rod 21 downward through the lever 41 to turn in the closing direction by supplying and discharging the pressure oil to and from the hydraulic cylinder 30 as described above. The piston 42 of the piston rod 33 of the cylinder 30 is
5 and its position is restricted, and at the position of this piston 42, the valve element 20 of the bleeding control valve 8 maintains the aforementioned valve opening. Therefore, the exhaust steam of the high-pressure section 2 flows into the low-pressure section 3 from the valve opening of the bleed control valve 8 to cool the blade section of the low-pressure section 3.
【００２２】なお、本実施例ではピストンロッド３３の
ピストン４２を油圧シリンダ３０のシリンダ３７の上板
３５に接触させてその位置を制限して抽気加減弁８の弁
開度を定めているが、機構上、ピストンロッド３３の下
方の動きが抽気加減弁８の閉方向であれば、ピストンロ
ッド３３のピストン４２をシリンダ３７の下板３６に接
触させてその位置を制限して抽気加減弁８の弁開度を定
めることになる。In the present embodiment, the piston 42 of the piston rod 33 is brought into contact with the upper plate 35 of the cylinder 37 of the hydraulic cylinder 30 to restrict the position thereof, thereby determining the valve opening of the bleed control valve 8. Mechanically, if the downward movement of the piston rod 33 is in the closing direction of the bleed control valve 8, the piston 42 of the piston rod 33 is brought into contact with the lower plate 36 of the cylinder 37 to restrict the position thereof and the bleed control valve 8 is controlled. The valve opening will be determined.
【００２３】図２は本発明の異なる実施例による油圧シ
リンダと、これにより開閉される抽気加減弁の主要部の
構成を模式的に示した構成図である。図２において図４
の従来例と異なるのは下記の通りであり、図３を参照し
ながら説明する。抽気加減弁８の弁棒２１に突起リング
４４を取付ける。なお、突起リング４４の取付位置は、
タービンの負荷遮断後の無負荷運転時のタービンロータ
１１の整定回転速度の保持時、高圧部２の排気蒸気が低
圧部３に流入して低圧部３の翼段落部を冷却するに足る
蒸気量が流れるのに必要な弁開度を保つように、弁箱２
４の案内部２３の端面に接触する位置にする。FIG. 2 is a schematic diagram showing the configuration of a hydraulic cylinder according to another embodiment of the present invention and the main parts of a bleed control valve which is opened and closed by the hydraulic cylinder. In FIG. 2, FIG.
The differences from the conventional example are as follows, and will be described with reference to FIG. The projection ring 44 is attached to the valve stem 21 of the bleed control valve 8. The mounting position of the projection ring 44 is
When the turbine rotor 11 is kept at the set rotation speed during the no-load operation after the turbine load is cut off, the amount of steam sufficient for the exhaust steam of the high-pressure section 2 to flow into the low-pressure section 3 and cool the blade section of the low-pressure section 3 Valve box 2 to maintain the valve opening required for
4 is set at a position where it comes into contact with the end face of the guide portion 23.
【００２４】このような構成により、負荷遮断時、抽気
加減弁８の弁開度は弁棒２１の突起リング４４が弁箱２
４の案内部２３の端面に接触して弁棒２１の位置が制限
され、弁体２０は前述のような弁開度を保つので、高圧
部２の排気蒸気はこの弁開度から低圧部３に流入して低
圧部３の翼段落部を冷却する。With such a configuration, when the load is cut off, the degree of opening of the bleed control valve 8 is such that the projection ring 44 of the valve rod 21 is
4, the position of the valve rod 21 is restricted by contact with the end face of the guide portion 23, and the valve body 20 maintains the valve opening as described above. And cools the blade section of the low-pressure section 3.
【００２５】[0025]
【発明の効果】以上の説明から明らかなように、本発明
によれば抽気蒸気タービンの負荷遮断時、抽気加減弁が
閉方向に向うとき、タービンの高圧部の排気蒸気が流れ
る抽気加減弁の弁開度を、低圧部の翼段落を冷却するに
足る蒸気量が流れるようにする開度制限手段、この手段
として抽気加減弁を開閉する油圧シリンダのピストンロ
ッドのピストンの位置制限、あるいは抽気加減弁の弁棒
の位置制限を行なうことにより、負荷遮断後の無負荷運
転時、タービンロータを整定回転速度に保持するとき、
高圧部の排気蒸気が前記抽気加減弁の弁開度から低圧部
に流入して低圧部の翼段落を冷却することができる。な
お、冷却する蒸気量は抽気加減弁の弁開度により選択で
きるので、冷却する蒸気量が大量であってもこれに対応
できる。As apparent from the above description, according to the present invention, when the load of the extraction steam turbine is shut off when the load of the extraction steam turbine is closed, the exhaust steam of the high pressure section of the turbine flows through the exhaust steam control valve. Opening limiting means for controlling the valve opening so that a sufficient amount of steam flows to cool the blade stage in the low-pressure section. As this means, restricting the position of the piston of the piston rod of the hydraulic cylinder for opening and closing the bleed control valve, or controlling the bleed control When the turbine rotor is held at a set rotation speed during no-load operation after load rejection by restricting the position of the valve stem of the valve,
Exhaust steam from the high-pressure section flows into the low-pressure section from the valve opening of the bleed control valve to cool the blade stage in the low-pressure section. Since the amount of steam to be cooled can be selected according to the opening degree of the bleed control valve, even if the amount of steam to be cooled is large, it can be handled.
【図１】本発明の実施例による抽気蒸気タービンの油圧
シリンダと、これにより開閉される抽気加減弁との主要
部の構成を模式的に示した構成図FIG. 1 is a configuration diagram schematically illustrating a configuration of a main part of a hydraulic cylinder of a bleed steam turbine according to an embodiment of the present invention and a bleed control valve that is opened and closed by the hydraulic cylinder.
【図２】本発明の異なる実施例による抽気蒸気タービン
の油圧シリンダと、これにより開閉される抽気加減弁と
の主要部の構成を模式的に示した構成図FIG. 2 is a configuration diagram schematically showing a configuration of a main part of a hydraulic cylinder of a bleed steam turbine according to a different embodiment of the present invention and a bleed control valve opened and closed by the hydraulic cylinder.
【図３】抽気蒸気タービンの系統図FIG. 3 is a system diagram of an extraction steam turbine.
【図４】従来の抽気蒸気タービンの油圧シリンダと、こ
れにより開閉される抽気加減弁との主要部の構成を模式
的に示した構成図FIG. 4 is a configuration diagram schematically showing a configuration of a main part of a conventional hydraulic cylinder of a bleed steam turbine and a bleed control valve opened and closed by the hydraulic cylinder.
１ 抽気蒸気タービン ２ 高圧部 ３ 低圧部 ７ 主蒸気加減弁 ８ 抽気加減弁 ２０ 弁体 ２１ 弁棒 ２３ 案内部 ２４ 弁箱 ３０ 油圧シリンダ ３２ ピストン ３３ ピストンロッド ３７ シリンダ ４１ レバー ４４ 突起リング DESCRIPTION OF SYMBOLS 1 Extraction steam turbine 2 High pressure part 3 Low pressure part 7 Main steam control valve 8 Extraction control valve 20 Valve body 21 Valve rod 23 Guide part 24 Valve box 30 Hydraulic cylinder 32 Piston 33 Piston rod 37 Cylinder 41 Lever 44 Projection ring
Claims (2)
部の蒸気入口に設けられ、高圧部に流入する蒸気量を制
御する主蒸気加減弁と、高圧部の排気蒸気が流入する低
圧部の蒸気入口に設けられ、前記排気蒸気から抽気した
抽気蒸気の圧力を制御し、油圧シリンダのピストンロッ
ドの往復動によりレバー機構を介して弁棒を往復動させ
て弁開度を得る抽気加減弁とを備える抽気蒸気タービン
であって、負荷遮断後にタービンロータを整定回転速度
に保持する時に、低圧部の翼段落を冷却するに足る高圧
部からの排気蒸気の蒸気量が流れる弁開度に抽気加減弁
の弁棒位置を機械的に制限する開度制限手段を設けたも
のにおいて、前記開度制限手段は、油圧シリンダピスト
ンロッドのピストンをシリンダの上板又は下板に接触さ
せてピストンロットの動きを制限する油圧シリンダの構
造であることを特徴とする抽気蒸気タービン。 1. A high-pressure section and a low-pressure section having blade stages, a main steam control valve provided at a steam inlet of the high-pressure section to control the amount of steam flowing into the high-pressure section, and a low-pressure section through which exhaust steam of the high-pressure section flows. Is provided at the steam inlet of the section, controls the pressure of the extracted steam extracted from the exhaust steam, and reciprocates the valve rod through the lever mechanism by the reciprocating motion of the piston rod of the hydraulic cylinder to obtain the valve opening by controlling the bleeding. Extraction steam turbine provided with a valve
Where the turbine rotor is settled after the load is cut off.
High enough to cool the low pressure section
The bleeding valve is controlled by the opening of the valve through which the amount of exhaust steam from the section flows.
Opening limit means for mechanically restricting the valve stem position
In the above, the opening limiting means may be a hydraulic cylinder piston.
The piston of the rod into contact with the upper or lower plate of the cylinder.
Hydraulic cylinder structure that restricts piston lot movement
A bleed steam turbine characterized by being constructed.
部の蒸気入口に設けられ、高圧部に流入する蒸気量を制
御する主蒸気加減弁と、高圧部の排気蒸気が流入する低
圧部の蒸気入口に設けられ、前記排気蒸気から抽気した
抽気蒸気の圧力を制御し、油圧シリンダのピストンロッ
ドの往復動によりレバー機構を介して弁棒を往復動させ
て弁開度を得る抽気加減弁とを備える抽気蒸気タービン
であって、負荷遮断後、タービンロータを整定回転速度
に保持時、低圧部の翼段落を冷却するに足る高圧部から
の排気蒸気の蒸気量が流れる弁開度に抽気加減弁の弁棒
位置を機械的に制限する開度制限手段を設けたものにお
いて、前記開度制限手段が、抽気加減弁の弁箱の弁棒案
内部の端面に接触させる弁棒に設けた突起体であること
を特徴とする抽気蒸気タービン。 2. A high-pressure section and a low-pressure section having blade stages, and a high-pressure section.
Installed at the steam inlet of the high pressure section to control the amount of steam flowing into the high pressure section.
Control the main steam control valve and the low
Provided at the steam inlet of the pressure section and extracted from the exhaust steam.
Controls the pressure of the extracted steam and adjusts the piston lock of the hydraulic cylinder.
The valve stem is reciprocated via the lever mechanism
Steam turbine provided with a bleed control valve to obtain a valve opening
After the load is cut off, the turbine rotor is settled at the rotation speed.
From the high pressure section that is sufficient to cool the low pressure section
The valve stem of the bleed control valve depends on the valve opening degree through which the amount of steam of exhaust steam flows
With the opening limiter that mechanically limits the position
Wherein the opening limiting means is a valve stem of a valve box of a bleed control valve.
Being a protrusion provided on the valve stem that comes into contact with the inner end surface
A bleed steam turbine characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31143294A JP3307124B2 (en) | 1994-12-15 | 1994-12-15 | Bleed steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31143294A JP3307124B2 (en) | 1994-12-15 | 1994-12-15 | Bleed steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08165905A JPH08165905A (en) | 1996-06-25 |
| JP3307124B2 true JP3307124B2 (en) | 2002-07-24 |
Family
ID=18017145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31143294A Expired - Fee Related JP3307124B2 (en) | 1994-12-15 | 1994-12-15 | Bleed steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3307124B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6909743B2 (en) * | 2018-02-26 | 2021-07-28 | 株式会社東芝 | Steam valve drive |
-
1994
- 1994-12-15 JP JP31143294A patent/JP3307124B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08165905A (en) | 1996-06-25 |
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