JP3051560B2 - Method and apparatus for reducing temperature difference between upper and lower half of outer casing in steam turbine - Google Patents
Method and apparatus for reducing temperature difference between upper and lower half of outer casing in steam turbineInfo
- Publication number
- JP3051560B2 JP3051560B2 JP4115189A JP11518992A JP3051560B2 JP 3051560 B2 JP3051560 B2 JP 3051560B2 JP 4115189 A JP4115189 A JP 4115189A JP 11518992 A JP11518992 A JP 11518992A JP 3051560 B2 JP3051560 B2 JP 3051560B2
- Authority
- JP
- Japan
- Prior art keywords
- outer casing
- cooling air
- lower half
- main steam
- steam turbine
- 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
- 238000000034 method Methods 0.000 title claims description 8
- 238000001816 cooling Methods 0.000 claims description 35
- 239000000446 fuel Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、蒸気タービンに関し、
特に、タービン停止時に発生する外車室の上半部及び下
半部間の温度差を低減する方法及び装置に関するもので
ある。BACKGROUND OF THE INVENTION The present invention relates to a steam turbine.
In particular , the upper half and lower
The present invention relates to a method and an apparatus for reducing a temperature difference between halves.
There is .
【０００２】[0002]
【従来の技術】蒸気タービンの停止時においては、一般
に、外車室の上半部の方が下半部より平均温度が高く、
停止時の外車室上下温度差は上半高の値を示す。そし
て、この値が大きくなると、外車室の上半部及び下半部
の軸方向伸び差により外車室が上側に凸状にそり、静止
部と回転部とのクリアランスを食い潰す。その結果、最
悪の場合には静止部と回転部との接触が生じ、損傷に至
る場合があった。2. Description of the Related Art When a steam turbine is stopped, generally, the upper half of the outer casing has a higher average temperature than the lower half.
The temperature difference between the upper and lower sides of the outer casing at the time of stoppage indicates a value of the upper half height. When this value increases, the outer casing warps upward due to the difference in axial extension between the upper half and the lower half of the outer casing, and the clearance between the stationary part and the rotating part is crushed. As a result, in the worst case, the stationary part and the rotating part come into contact with each other, which may lead to damage.
【０００３】そこで、従来は、強制冷却停止、即ちター
ビンを停止する際に予め蒸気条件を下げ、タービン全体
のメタル温度を下げた後に停止することが広く行われて
いる。そして、この強制冷却停止の方法によれば、外車
室の上下温度差が発生しなくなるまで、低温の蒸気をタ
ービンに流し続け、外車室のメタル温度を下げるように
している。Therefore, conventionally, it has been widely practiced to forcibly stop cooling, that is, to lower the steam conditions in advance when stopping the turbine and to lower the metal temperature of the entire turbine before stopping. According to the forced cooling stop method, low-temperature steam is continuously supplied to the turbine until the vertical temperature difference in the outer casing does not occur, thereby lowering the metal temperature in the outer casing.
【０００４】[0004]
【発明が解決しようとする課題】このような従来の方法
は、しかし、次に述べるような問題があった。即ち、上
述した強制冷却停止の方法によれば、本来ならプラント
を停止するのであるから、燃料を消費する必要がもうな
いにもかかわらず、外車室の上下温度差がなくなるまで
約６時間程度低温の蒸気を発生させるために（タービン
を無事停止させるために）、余分の燃料を消費してい
た。However, such a conventional method has the following problems. In other words, according to the above-described forced cooling stop method, the plant is normally shut down. Therefore, although there is no longer a need to consume fuel, the temperature is kept low for about 6 hours until the vertical temperature difference in the outer casing disappears. Extra fuel was consumed to generate steam (to safely shut down the turbine).
【０００５】本発明は、このような従来技術の課題を解
決するためになされたもので、低温の蒸気を使用して強
制冷却をすることなく、蒸気タービンの停止時に発生す
る外車室の上下温度差を低減することができる方法及び
装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and does not perform forced cooling using low-temperature steam. A method capable of reducing the difference and
It is intended to provide a device .
【０００６】[0006]
【課題を解決するための手段】この目的から、請求項１
に係る本発明は、上半部及び下半部からなる外車室を有
する蒸気タービンの停止時に、前記外車室の前記上半部
に接続した主蒸気入口管に冷却空気を注入すると共に、
この注入した冷却空気を前記外車室の前記下半部に接続
した主蒸気入口管より吸い出す、蒸気タービンにおける
外車室上下半部間温度差の低減方法を提供している。ま
た、上述の目的を達成するため、請求項２に係る本発明
は、外車室の上半部及び下半部にそれぞれ接続した主蒸
気入口管を有する蒸気タービンの該外車室の上半部に接
続した前記主蒸気入口管に選択的に連絡する冷却空気供
給ラインを備えると共に、前記外車室の前記下半部に接
続した前記主蒸気入口管に選択的に連絡する冷却空気吸
出ラインを備える、蒸気タービンにおける外車室上下半
部間温度差の低減装置を提供している。For this purpose, a first aspect of the present invention is provided.
The present invention according to the present invention, when the steam turbine having an outer casing consisting of an upper half and a lower half is stopped , while injecting cooling air into a main steam inlet pipe connected to the upper half of the outer casing ,
Sucked from the main steam inlet tube to the injected cooling air is connected to the lower half of the outer casing, in the steam turbine
A method for reducing the temperature difference between the upper and lower halves of the outer casing is provided . Ma
In order to achieve the above object, the present invention according to claim 2 is provided.
Is the main steam connected to the upper half and lower half of the outer casing, respectively.
Contacting the upper half of the outer casing of a steam turbine having an air inlet pipe
Cooling air supply for selectively communicating with the main steam inlet pipe
A supply line, and is connected to the lower half of the outer casing.
Cooling air suction to selectively communicate with the main steam inlet pipe
Upper and lower half of outer casing of steam turbine with outlet line
A device for reducing the temperature difference between parts is provided .
【０００７】[0007]
【作用】上述した構成を有する蒸気タービンでは、その
停止時に、外車室において、下半部よりも温度が高い上
半部に接続されている主蒸気入口管の方を冷却空気によ
り冷却することにより、主蒸気入口管から外車室の上半
部への入熱が減少して、上半部の冷却効果が増大すると
共に、注入した冷却空気は内車室やロータなどの高温部
品と熱交換した後、外車室の下半部に接続されている主
蒸気入口管より吸い出されて、下半部を冷却しないの
で、外車室の上下半部間の温度差が低減する。In the steam turbine having the above configuration,
At the time of stop, in the outer casing, the main steam inlet pipe connected to the upper half, which is higher in temperature than the lower half, is cooled by cooling air, so that the main steam inlet pipe moves to the upper half of the outer casing. As the heat input to the inner casing decreases, the cooling effect in the upper half increases, and the injected cooling air exchanges heat with high-temperature components such as the inner casing and the rotor, and is then connected to the lower half of the outer casing. Since it is sucked out from the main steam inlet pipe and does not cool the lower half, the temperature difference between the upper and lower halves of the outer casing is reduced.
【０００８】[0008]
【実施例】以下、図１を参照して本発明の一実施例につ
いて詳細に説明する。図１において、１は従来周知の蒸
気タービンを示し、その外車室は上半部２Ａと下半部２
Ｂとで構成され、外車室の上半部２Ａには例えば２本の
主蒸気入口管３，４が、また外車室の下半部２Ｂには例
えば１本の主蒸気入口管５がそれぞれ接続されている。
そして、各主蒸気入口管３，４，５にはそれぞれ主蒸気
加減弁６，７，８が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. In FIG. 1, reference numeral 1 denotes a conventionally known steam turbine whose outer casing has an upper half 2A and a lower half 2A.
B, for example, two main steam inlet pipes 3, 4 are connected to the upper half 2A of the outer casing, and one main steam inlet pipe 5, for example, is connected to the lower half 2B of the outer casing. Have been.
The main steam inlet pipes 3, 4, 5 are provided with main steam control valves 6, 7, 8 respectively.
【０００９】なお、図１において、下半部２Ｂには、主
蒸気入口９、高圧排気口１０、高温再熱蒸気入口１１、
中圧抽気口１２，１３等が形成されており、また、上半
部２Ａには、中圧排気口１４が設けられているが、これ
らに関する蒸気タービンの構成は本発明の要旨と直接関
係がないと共に、従来からよく知られているので、その
詳細な説明は省略する。In FIG. 1, the lower half 2B has a main part.
Steam inlet 9, high pressure exhaust port 10, high temperature reheat steam inlet 11,
Medium pressure bleed ports 12 and 13 are formed.
The part 2A is provided with a medium-pressure exhaust port 14, but the configuration of the steam turbine relating to these is not directly related to the gist of the present invention and is well known in the related art, so that detailed description thereof is omitted. I do.
【００１０】さて、本実施例によれば、外車室の上半部
２Ａに接続されている２本の主蒸気入口管３，４の主蒸
気加減弁６，７下流側部分には、冷却空気２１を供給す
る冷却空気供給ライン２２が接続されている。一方、外
車室の下半部２Ｂに接続されている主蒸気入口管５の主
蒸気加減弁８の下流側部分には、エゼクタ等により冷却
空気２１を吸い出す冷却空気吸出ライン２３が接続され
ている。According to the present embodiment, the cooling air is supplied to the downstream portions of the main steam control valves 6 and 7 of the two main steam inlet pipes 3 and 4 connected to the upper half 2A of the outer casing. A cooling air supply line 22 for supplying 21 is connected. On the other hand, a cooling air suction line 23 that sucks cooling air 21 by an ejector or the like is connected to a downstream portion of the main steam control valve 8 of the main steam inlet pipe 5 connected to the lower half 2B of the outer casing. .
【００１１】そして、蒸気タービン１の停止時には、各
主蒸気加減弁６，７，８を閉じ、冷却空気２１を冷却空
気供給ライン２２から主蒸気入口管３，４に供給し、こ
れら主蒸気入口管３，４を通して外車室の上半部２Ａに
注入する。このようにして、外車室の下半部２Ｂよりも
温度が高い上半部２Ａに接続されている主蒸気入口管
３，４の方を冷却空気２１により冷却することにより、
主蒸気入口管３，４から外車室の上半部２Ａへの入熱が
減少し、上半部２Ａの冷却効果が増大する。When the steam turbine 1 is stopped,
Close the main steam control valves 6, 7, 8 and cool the cooling air 21
From the gas supply line 22 to the main steam inlet pipes 3 and 4,
Through the main steam inlet pipes 3 and 4 to the upper half 2A of the outer casing
inject. In this manner, the outer casing is lower than the lower half 2B.
Main steam connected to upper part 2A where temperature is highInlet pipe
By cooling 3 and 4 by cooling air 21,
Heat input from the main steam inlet pipes 3 and 4 to the upper half 2A of the outer casing
The cooling effect of the upper half 2A increases.
【００１２】また、この注入する冷却空気２１は、なに
もしなければ、主蒸気入口管３，４を冷却しながら自ら
は加熱され、外車室の内部に入りこむが、どこに行くか
分からない。そして、この空気温度は外車室内部のメタ
ル温度よりは低いので、外車室の上半部２Ａとともに、
下半部２Ｂも冷却してしまう可能性がある。そこで、本
発明の実施例では、この注入した冷却空気２１を、内車
室やロータなどの高温部品と熱交換させた後、外車室の
下半部２Ｂに接続されている主蒸気入口管５を通して、
冷却空気吸出ライン２３により吸い出すようにしてお
り、これにより下半部２Ｂが冷却空気２１により冷却さ
れることがない。したがって、外車室の上半部２Ａ，下
半部２Ｂ間の温度差が低減される。The cooling air 21 to be injected is heated by itself while cooling the main steam inlet pipes 3 and 4 and enters the interior of the outer casing if there is nothing to do, but it is not known where to go. And since this air temperature is lower than the metal temperature inside the outer casing, together with the upper half 2A of the outer casing,
The lower half 2B may also be cooled. Therefore, in the embodiment of the present invention, the injected cooling air 21 is subjected to heat exchange with high-temperature components such as the inner casing and the rotor, and then the main steam inlet pipe 5 connected to the lower half 2B of the outer casing. Through
The cooling air is sucked out by the cooling air suction line 23, so that the lower half 2B is not cooled by the cooling air 21. Therefore, the temperature difference between the upper half 2A and the lower half 2B of the outer casing is reduced.
【００１３】なお、冷却空気２１としては常温の空気を
使用することができ、またその供給量は２００ｋｇ／
Ｈ、供給時間はターニング開始後（タービントリップ約
３０分後）より４０時間程度とし、これにより外車室の
上下半部間の温度差を約１５℃低減することができる。Air at normal temperature can be used as the cooling air 21, and its supply amount is 200 kg /
H. The supply time is set to about 40 hours after the start of turning (after about 30 minutes of the turbine trip), whereby the temperature difference between the upper and lower halves of the outer casing can be reduced by about 15 ° C.
【００１４】[0014]
【発明の効果】以上述べたように、本発明によれば、低
温の蒸気を使用しての強制冷却をすることなしに、蒸気
タービンの停止後に発生する外車室の上下半部の温度差
を低減することができ、したがって強制冷却停止に要す
る約６時間程度の蒸気発生のための燃料代を節約でき
る。As described above, according to the present invention, it is possible to reduce the temperature difference between the upper and lower halves of the outer casing generated after the steam turbine is stopped without performing forced cooling using low-temperature steam. Therefore, the fuel cost for generating steam for about 6 hours required for forced cooling stop can be saved.
【００１５】また、外車室の上下半部間の温度差を低減
できることから、車室猫ぞり（上側凸の変形）による回
転部と静止部との半径方向の接触が生じることなく、接
触振動やシールフィンの摩耗が発生しないので、タービ
ンの信頼性や性能が損なわれることがないことは勿論で
ある。Further, since the temperature difference between the upper and lower halves of the outer casing can be reduced, there is no contact between the rotating part and the stationary part in the radial direction due to the cat sledding of the casing (upward convex deformation), and there is no contact vibration. Of course, the wear and seal fins do not occur, so that the reliability and performance of the turbine are not impaired.
【図１】 本発明による外車室上下半部間温度差の低減
方法を実施するための装置が組み込まれた蒸気タービン
の一例を示す図である。FIG. 1 is a diagram showing a reduction in the temperature difference between the upper and lower halves of an outer casing according to the present invention
FIG. 2 shows an example of a steam turbine incorporating an apparatus for performing the method .
１…蒸気タービン、２Ａ…外車室の上半部、２Ｂ…外車
室の下半部、３，４，５…主蒸気入口管、２１…冷却空
気、２２…冷却空気供給ライン、２３…冷却空気吸出ラ
イン。DESCRIPTION OF SYMBOLS 1 ... Steam turbine, 2A ... Upper half of outer casing, 2B ... Lower half of outer casing, 3, 4, 5 ... Main steam inlet pipe, 21 ... Cooling air, 22 ... Cooling air supply line, 23 ... Cooling air Suction line.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−99219（ＪＰ，Ａ) 特開 平２−196111（ＪＰ，Ａ) 実開 昭64−53404（ＪＰ，Ｕ) 実開 昭49−120902（ＪＰ，Ｕ) 実開 昭55−83506（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F01D 25/26 - 25/28 F01D 25/14 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-99219 (JP, A) JP-A-2-196111 (JP, A) Fully open 1-53404 (JP, U) Really open 1974 120902 (JP, U) Japanese Utility Model Showa 55-83506 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) F01D 25/26-25/28 F01D 25/14
Claims (2)
る蒸気タービンの停止時に、前記外車室の前記上半部に
接続した主蒸気入口管に冷却空気を注入すると共に、こ
の注入した冷却空気を前記外車室の前記下半部に接続し
た主蒸気入口管より吸い出す、蒸気タービンにおける外
車室上下半部間温度差の低減方法。 When the steam turbine is stopped with claim 1] on the outer casing consisting of halves and lower halves, while injecting a cooling air to the main steam inlet tube connected to the upper half of the outer casing, and the injected the cooling air sucked from the main steam inlet tube connected to the lower half of the outer casing, the outer in the steam turbine
A method to reduce the temperature difference between the upper and lower halves of the cabin .
続した主蒸気入口管を有する蒸気タービンの該外車室の
上半部に接続した前記主蒸気入口管に選択的に連絡する
冷却空気供給ラインを備えると共に、前記外車室の前記
下半部に接続した前記主蒸気入口管に選択的に連絡する
冷却空気吸出ラインを備える、蒸気タービンにおける外
車室上下半部間温度差の低減装置。2. An upper casing and a lower half of an outer casing, respectively.
Of the outer casing of a steam turbine having a continuous main steam inlet pipe
Selectively communicate with the main steam inlet pipe connected to the upper half
A cooling air supply line; and
Selectively communicate with the main steam inlet pipe connected to the lower half
Outside in steam turbine with cooling air suction line
A device for reducing the temperature difference between the upper and lower halves of the cabin .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115189A JP3051560B2 (en) | 1992-04-09 | 1992-04-09 | Method and apparatus for reducing temperature difference between upper and lower half of outer casing in steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4115189A JP3051560B2 (en) | 1992-04-09 | 1992-04-09 | Method and apparatus for reducing temperature difference between upper and lower half of outer casing in steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05288007A JPH05288007A (en) | 1993-11-02 |
| JP3051560B2 true JP3051560B2 (en) | 2000-06-12 |
Family
ID=14656560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4115189A Expired - Fee Related JP3051560B2 (en) | 1992-04-09 | 1992-04-09 | Method and apparatus for reducing temperature difference between upper and lower half of outer casing in steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3051560B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3484901D1 (en) * | 1983-09-09 | 1991-09-12 | Sony Corp | PLAYBACK FOR AUDIO SIGNAL. |
| JP2006037855A (en) * | 2004-07-28 | 2006-02-09 | Mitsubishi Heavy Ind Ltd | Cylinder casing and gas turbine |
| US9151182B2 (en) * | 2011-04-22 | 2015-10-06 | General Electric Company | System and method for removing heat from a turbomachine |
| EP2565401A1 (en) | 2011-09-05 | 2013-03-06 | Siemens Aktiengesellschaft | Method for temperature balance in a steam turbine |
-
1992
- 1992-04-09 JP JP4115189A patent/JP3051560B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05288007A (en) | 1993-11-02 |
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