JPH08165905A - Bleed steam turbine - Google Patents
Bleed steam turbineInfo
- Publication number
- JPH08165905A JPH08165905A JP31143294A JP31143294A JPH08165905A JP H08165905 A JPH08165905 A JP H08165905A JP 31143294 A JP31143294 A JP 31143294A JP 31143294 A JP31143294 A JP 31143294A JP H08165905 A JPH08165905 A JP H08165905A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- valve
- extraction
- pressure part
- 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.)
- Granted
Links
Landscapes
- Control Of Turbines (AREA)
Abstract
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 an extraction steam turbine equipped with an extraction control valve for controlling the pressure of extraction steam extracted from 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 section and a low pressure section are provided, and the pressure of the extracted steam extracted from the exhaust steam of the high pressure section is
A system shown in FIG. 3 is known as an extraction steam turbine in which the extraction pressure control valve provided at the steam inlet of the low pressure portion controls the pressure to a predetermined pressure required by the process.
【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。In FIG. 3, the extraction steam turbine 1 comprises a high pressure section 2 whose main body has a blade section and a low pressure section 3 which has a blade section following the high pressure section 2, and is connected to an exhaust chamber of the high pressure section 2. A bleed air supply system 6 for supplying bleed steam extracted from the 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 is provided with the pressure of extraction steam supplied to the process 5. A bleed air control valve 8 for controlling 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。The rotation speed detector 10 is a turbine rotor 11
Is installed in the vehicle and detects the rotation speed of the turbine rotor 11. The extraction pressure detector 12 is provided in the extraction supply system 6 and detects the pressure of extraction 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 extraction air pressure detector 12, and inputs the main steam control valve 7 and the extraction control valve. 8 is controlled to control the rotation speed of the turbine rotor 11, the steam amount corresponding to the turbine load and the extraction load, and the process 5 is controlled by controlling the extraction control valve 8.
The bleed air pressure supplied to is controlled to the 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 such a configuration, the main steam supply system 15
After passing through the main steam, the main steam control valve 7 whose valve opening is controlled by the control action of the speed governor 14 is controlled to a steam amount corresponding to the turbine load and the extraction load, and flows into the high-pressure unit 2 to perform work. To do. The extracted steam extracted from the exhaust steam of the high pressure unit 2 is supplied to the process 5 so that the pressure detected by the extraction pressure detector 12 by the speed governor 14 becomes the predetermined pressure required by the process 5. It is controlled by the extraction control valve 8. The remaining extracted steam of the high-pressure part 2 flows into the low-pressure part 3 for work, and is then discharged to the outside via the 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 portion 2 and the low pressure portion 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 extraction steam turbine 1 is cut off, the main steam control valve 7 and the extraction control valve 8 are once fully closed by the control action of the speed governor 14, but the turbine rotor during no-load operation. In order to maintain 11 at the set rotational speed, only the main steam control valve 7 is opened so that the steam flow amount required for the no-load operation of the turbine is opened.
After passing through the main steam, the main steam flows through the high pressure part 2 and the turbine rotor 1
1 is rotated, but the extraction control valve 8 remains fully closed.
At this time, the exhaust vapor of the high pressure section 2 flows toward the extraction 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 extraction control valve 8
Since steam does not flow to the low pressure portion 3 on the further downstream side, the temperature of the blade stage portion of the low pressure portion 3 excessively rises due to the rotation of the turbine rotor 11, and the blades and the like are rubbed due to thermal deformation and thermal expansion of the casing and the turbine rotor. Or vibration occurs. Therefore, conventionally, in order to prevent the temperature rise of the blade section of the low pressure portion 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 the configuration of a hydraulic cylinder and a main part of a bleed air control valve that is opened and closed by the hydraulic cylinder. A conventional technique will be described with reference to the drawing. 4, the extraction control valve 8 has 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 that houses the valve body 20 and the valve seat 22 and has a guide portion 23 that houses the gland packing that surrounds the valve rod 21 when the valve rod 21 reciprocates. Here, in the valve body 20, the steam that has flowed into the valve box 24 is transferred to the valve seat 22.
Is provided with a cooling steam hole 27 that flows into the valve outlet 26.
【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 includes 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 the rod 3.
The cylinder 37 is composed of an upper plate 35 and a lower plate 36 through which 1 passes, and supply and discharge pipes 38 and 39 for supplying and discharging pressure oil are connected to the 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 1 and the valve rod 21 of the extraction control valve 8 by pin connection.
【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 settling speed by the opening degree of the main steam control valve 7 as described above, but the extraction control valve 8 is completely operated. Closes. The bleed air control valve 8 is fully closed as follows. The pressure oil is supplied to and discharged from the hydraulic cylinder 30 through the supply and discharge pipes 38 and 39 by the control action of the speed governor 14, and the piston rod 33 moves upward. By this movement of the piston rod 33, the valve body 20 of the extraction 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 extraction control valve 8 as described above, from the high pressure section 2 after flowing into the high pressure section 2 from the main steam control valve 7 to perform work in order to set the turbine rotor 11 to a set rotational speed. Of the exhaust steam flows into the low pressure portion 3 through the cooling steam hole 27 provided in the valve body 20 of the extraction control valve 8 to flow, and cools the blade stage portion of the low pressure portion 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 set rotational speed of the turbine rotor is maintained, the extraction control valve 8 is fully closed as described above. At this time, the low pressure part 3 of the extraction steam turbine 1 is closed. In order to cool the blade section, the exhaust steam of the high pressure section 2 is caused to flow into the low pressure section 3 via the cooling steam hole 27 provided in the valve body 20 of the extraction 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 restricted by the structure of the valve body 20, there is a problem that the amount of cooling steam is limited and it cannot be dealt with when a large amount of cooling steam is required. An object of the present invention is to maintain the settled rotation speed of the turbine rotor after load shedding, when cooling the blade paragraph of the low pressure part of the extraction steam turbine by the exhaust steam of the high pressure part supplied via the extraction control valve, An object of the present invention is to provide an extraction 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】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
抽気蒸気タービンにおいて、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
を設けるものとする。A high pressure part and a low pressure part having blade sections, a main steam control valve provided at a steam inlet of the high pressure part for controlling the amount of steam flowing into the high pressure part, and an exhaust steam of the high pressure part. Is provided at the steam inlet of the low-pressure part into which the inflow is generated, controls the pressure of the extracted steam extracted from the exhaust steam, and reciprocates the piston rod of the hydraulic cylinder to reciprocate the valve rod through the lever mechanism to open the valve. In the extraction steam turbine equipped with the extraction control valve, the valve opening that allows the amount of exhaust steam from the high pressure section to cool the blade section of the low pressure section when the turbine rotor is maintained at the settling speed after the load is cut off. Each time, a degree-of-opening limiting means for mechanically limiting the valve rod position of the extraction control valve is provided.
【0015】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
の構造であるものとする。また、開度制限手段は、抽気
加減弁の弁箱の弁棒案内部の端面に接触させる突起体を
弁棒に設けるものとする。The above-mentioned opening degree restricting means is a structure of a hydraulic cylinder that restricts the movement of the piston rod by bringing the piston of the piston rod of the hydraulic cylinder into contact with the upper plate or the lower plate of the cylinder. Further, the opening degree restricting means is provided with a protrusion on the valve rod that comes into contact with the end face of the valve rod guide portion of the valve box of the extraction control valve.
【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。[Operation] A high pressure part and a low pressure part having wing paragraphs, a main steam control valve for controlling the amount of steam flowing into the high pressure part at the steam inlet of the high pressure part, and bleeding from exhaust steam of the high pressure part to the steam inlet of the low pressure part. In an extraction steam turbine equipped with an extraction control valve that controls the pressure of extraction steam, in order to maintain the turbine rotor at the settling speed during no-load operation after the load is cut off, the main steam control valve is The amount of steam required to maintain the settled rotation speed is opened to an opening at which the steam flows to the high-pressure portion, and the steam flows to the high-pressure portion to work at 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 air control valve faces toward the fully closed position as described below. That is, the bleed air control valve moves the valve rod of the bleed air control valve through the lever mechanism by the movement of the piston rod of the hydraulic cylinder to orient the valve in the closing direction. At this time, the opening degree of the valve limits the valve rod position by the opening degree limiting means so that a sufficient amount of steam for cooling the blade stage of the low pressure portion flows.
【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 degree limiting means limits the movement of the piston of the piston rod of the hydraulic cylinder, that is, the piston of the piston rod is brought into contact with the upper or lower plate of the cylinder of the hydraulic cylinder, or , A protrusion is provided on the valve rod of the extraction control valve, and the protrusion contacts the end face of the valve rod guide part of the valve box to keep the extraction control valve at the time of maintaining the settling speed of the turbine rotor after the load is cut off. The valve opening is maintained as described above, and the exhaust vapor 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 bleed air control valve that is opened and closed by the hydraulic cylinder. In FIG. 1 and FIG. 2 described later, the same parts as those of the conventional example of FIGS. 1 is different from the conventional example of FIG. 4 in the following points, which 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 piston 42 of the piston rod 33 of the hydraulic cylinder 30 is brought into contact with the upper plate 35 of the cylinder 37 to limit the position of the piston rod 33. Then, the valve opening degree of the valve body 20 of the extraction control valve 8 determined via the lever 41 at this limited position of the piston rod 33 is maintained at the set rotational speed of the turbine rotor 11 during the no-load operation after the turbine load is cut off. At this time, the opening degree is set such that the exhaust vapor of the high-pressure portion 2 flows enough to cool the blade stage portion of the low-pressure portion 3.
【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。Here, the piston 42 is provided with annular grooves 42a on its upper and lower surfaces, 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 / discharge pipes 38, 39. I am able to do it. With such a configuration, after the load is cut off, the amount of steam sufficient to maintain the settling rotation speed of the turbine rotor 11 during no-load operation from the main steam control valve 7 by the control action of the speed governor 14 as described above is high. To work in the wing paragraph. On the other hand, when the load is cut off, the bleed air control valve 8 moves the valve rod 21 downward through the lever 41 to direct it toward the closing direction by supplying and discharging pressurized oil to and from the hydraulic cylinder 30 as described above. The piston 42 of the piston rod 33 of the cylinder 30 is the upper plate 3 of the cylinder 37.
5 and its position is restricted, and at the position of this piston 42, the valve body 20 of the extraction control valve 8 maintains the above-mentioned valve opening degree. Therefore, the exhaust steam of the high pressure part 2 flows into the low pressure part 3 from the opening degree of the extraction control valve 8 to cool the blade stage part of the low pressure part 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 this 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 limit the position thereof to determine the valve opening degree of the extraction control valve 8. In the mechanism, if the downward movement of the piston rod 33 is in the closing direction of the extraction 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 limit the position of the extraction control valve 8. 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 construction of a hydraulic cylinder according to another embodiment of the present invention and the construction of the main parts of the extraction control valve which is opened and closed by the hydraulic cylinder. In FIG. 2, FIG.
The difference from the conventional example is as follows, and will be described with reference to FIG. The protrusion ring 44 is attached to the valve rod 21 of the bleeding control valve 8. The mounting position of the protrusion ring 44 is
A sufficient amount of steam for exhaust gas of the high-pressure part 2 to flow into the low-pressure part 3 and cool the blade paragraph of the low-pressure part 3 when maintaining the settling speed of the turbine rotor 11 during no-load operation after the load of the turbine is cut off. Valve box 2 to maintain the valve opening required for the flow
4 to 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 this configuration, when the load is cut off, the valve opening of the extraction control valve 8 is controlled by the protrusion ring 44 of the valve rod 21.
4, the position of the valve rod 21 is restricted by contacting the end face of the guide portion 23, and the valve body 20 maintains the valve opening degree as described above. To cool the blade stage of the low pressure part 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 extraction steam control valve is closed, the extraction steam control valve of the high pressure portion of the turbine flows when the extraction control valve moves toward the closing direction. The valve opening is an opening restriction device that allows a sufficient amount of steam to cool the blades in the low-pressure section, and as this means, the piston position of the piston rod of the hydraulic cylinder that opens and closes the extraction valve is restricted, or the extraction amount is adjusted. By limiting the position of the valve stem of the valve, when maintaining the turbine rotor at the set speed during no-load operation after the load is cut off,
Exhaust steam from the high pressure portion can flow into the low pressure portion from the valve opening degree of the extraction control valve to cool the blade stage of the low pressure portion. Since the amount of steam to be cooled can be selected according to the valve opening degree of the extraction control valve, even if the amount of steam to be cooled is large, this can be dealt with.
【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 showing a main part of a hydraulic cylinder of an extraction steam turbine according to an embodiment of the present invention and an extraction 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 the configuration of main parts of a hydraulic cylinder of an extraction steam turbine according to another embodiment of the present invention and an extraction control valve that is opened and closed by the hydraulic cylinder.
【図3】抽気蒸気タービンの系統図[Fig. 3] System diagram of 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 main part of a hydraulic cylinder of a conventional extraction steam turbine and an extraction control valve that is 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 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 Portion 24 Valve Box 30 Hydraulic Cylinder 32 Piston 33 Piston Rod 37 Cylinder 41 Lever 44 Projection Ring
Claims (3)
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
において、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ことを特
徴とする抽気蒸気タービン。1. A high pressure part and a low pressure part having blade sections, a main steam control valve provided at a steam inlet of the high pressure part for controlling the amount of steam flowing into the high pressure part, and a low pressure to which exhaust steam of the high pressure part flows. Is installed at the steam inlet of the control unit, controls the pressure of the extracted steam extracted from the exhaust steam, and reciprocates the piston rod of the hydraulic cylinder to reciprocate the valve rod through the lever mechanism to obtain the valve opening degree. In an extraction steam turbine equipped with a valve, when the turbine rotor is maintained at the set rotational speed after the load is cut off, the extraction amount is adjusted to the valve opening that allows the amount of exhaust steam from the high pressure part to cool the blade stages of the low pressure part. An extraction steam turbine, characterized in that opening degree limiting means for mechanically limiting the valve stem position of the valve is provided.
段は、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。2. A structure of a hydraulic cylinder according to claim 1, wherein the opening degree limiting means limits the movement of the piston lot by bringing the piston of the piston rod of the hydraulic cylinder into contact with the upper plate or the lower plate of the cylinder. An extraction steam turbine characterized by being present.
段は、抽気加減弁の弁箱の弁棒案内部の端面に接触させ
る突起体を弁棒に設けたことを特徴とする抽気蒸気ター
ビン。3. The extraction steam according to claim 1, wherein the opening restricting means is provided with a protrusion for contacting an end face of a valve rod guide portion of a valve box of the extraction control valve on the valve rod. Turbine.
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 true JPH08165905A (en) | 1996-06-25 |
JP3307124B2 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019163626A1 (en) * | 2018-02-26 | 2019-08-29 | 株式会社 東芝 | Steam valve driving device |
-
1994
- 1994-12-15 JP JP31143294A patent/JP3307124B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019163626A1 (en) * | 2018-02-26 | 2019-08-29 | 株式会社 東芝 | Steam valve driving device |
JP2019148196A (en) * | 2018-02-26 | 2019-09-05 | 株式会社東芝 | Steam valve drive unit |
US11428246B2 (en) | 2018-02-26 | 2022-08-30 | Kabushiki Kaisha Toshiba | Steam valve driving apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP3307124B2 (en) | 2002-07-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7258524B2 (en) | Method of regulating the flow rate of air in a rotary shaft of a turbomachine | |
KR100592143B1 (en) | Method of operation of industrial gas turbine for optimal performance | |
US4519207A (en) | Combined plant having steam turbine and gas turbine connected by single shaft | |
JPS62182444A (en) | Method and device for controlling cooling air for gas turbine | |
EP1050666B1 (en) | Steam cooling system for balance piston of a steam turbine and associated method | |
US2336178A (en) | Thermal power plant | |
RU2270352C2 (en) | Gas turbine sealing-up system | |
JP4635012B2 (en) | Aircraft air guide flap having a control device for controlling the pressure applied to the air guide flap, a method for adjusting the position of the air guide flap, and a ram air device including such an air guide flap | |
US6779967B2 (en) | Device for air mass flow control | |
JPH08165905A (en) | Bleed steam turbine | |
KR20180019219A (en) | Method for cooling turbo machine | |
JPS58214603A (en) | Vane edge gap adjusting device of a fluid machine | |
US20200408224A1 (en) | Clearance control system for a compressor shroud assembly | |
RU2211338C2 (en) | Device for nozzle steam distribution in high-pressure cylinder of steam turbine | |
JP3959172B2 (en) | Steam turbine control method | |
JP4155495B2 (en) | Cooling equipment for reactor isolation | |
JP3165619B2 (en) | Thermal stress reduction operation method of steam turbine in single shaft combined cycle | |
JPH0932996A (en) | Integral type fluid stop valve and control valve | |
JP2009250146A (en) | Steam valve device and control method of steam turbine using it | |
JP2979645B2 (en) | Steam control valve for steam turbine | |
CN211061178U (en) | Auxiliary system for steam turbine valve quick-closing test | |
JPH10141006A (en) | Control device for city gas line energy recovery turbine | |
JP2003027904A (en) | Steam valve | |
JP4473464B2 (en) | Operation method of combined cycle power plant | |
JPH02153232A (en) | Heating device for gas turbine casing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |