JPS58140403A - Steam turbine - Google Patents
Steam turbineInfo
- Publication number
- JPS58140403A JPS58140403A JP2105082A JP2105082A JPS58140403A JP S58140403 A JPS58140403 A JP S58140403A JP 2105082 A JP2105082 A JP 2105082A JP 2105082 A JP2105082 A JP 2105082A JP S58140403 A JPS58140403 A JP S58140403A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle box
- turbine rotor
- turbine
- steam
- rotor
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明Ｏ技術分野〕
本発明は蒸気タービンに係り、特（高圧タービｙ 菖−
Ｂ ｏノズルボックスの熱応力勿低減した蒸気タービン
に関する０
〔発明の背景技術とその問題点〕
最近、大容量蒸気タービ／の効率向上のため、タービン
入口蒸気条件１−＊温高圧化する傾向が強まっている０
このように蒸気条件が苛＃になると、タービンを構成す
る材料の強度的な問題が多く生じてくる０例えｄ１高温
にさらされるタービンロータ表面の異常温度上昇による
ロータの曲りや、高圧第一段のノズルボックスや、又は
再熱部入ロスクロール等の熱応力が問題となる〇
第１図に従来の蒸気タービンの高圧第一段ノズルボック
ス周辺を示すロタ−ビンロータ（１）、ノズルボックス
（２）およびパツキンヘッド（３）によって一つの囲ま
れた空間（４）を形成している０このタービンを長時間
運転すると、タービンロータ（１）周囲気体の摩擦によ
って、この空間（４）内の気体温度は次第に上昇し、入
口蒸気温度以上に達することが実験により確認されてい
る。このような状態が長く続くと、タービンロータ（１
）表ＴｋＪは異常に温度が上昇し、ロータ材料の微少な
周方向クリープ特性の不均一などの原因によ）、タービ
ンロータ（１）が曲ることがある。これを避けるため、
第１段動翼１出た低温蒸気ｔタービンロータ（１）のバ
ランスホール（５）ｔ−通して矢印（６）のように上流
側に戻し、紬記９間（４）に流入させ、タービンロータ
（１）表面の異常温度上昇を防ぐ手段中、他に図示しな
い穴を明り、そこから低温蒸気を前記空間（４）に流入
させ、タービンロータ（ｌｌｔ−冷却する手段などがあ
るコタービン入口蒸気条件が高温高圧化するはと、ター
ビンロータ（１１Ｔｈ強力に冷却しなければなら々い。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a steam turbine, particularly (high pressure turbine).
[Background art of the invention and its problems] Recently, in order to improve the efficiency of large-capacity steam turbines, the turbine inlet steam conditions 1-* tend to be higher in temperature and pressure. 0 is getting stronger
When the steam conditions become harsh in this way, many problems arise regarding the strength of the materials that make up the turbine. Thermal stress is a problem in the nozzle box of the rotor, or the rotor scroll entering the reheating section. Figure 1 shows the vicinity of the high-pressure first stage nozzle box of a conventional steam turbine. ) and the packing head (3) form an enclosed space (4). When this turbine is operated for a long time, the gas in this space (4) is It has been confirmed through experiments that the temperature gradually increases and reaches the inlet steam temperature or higher. If this condition continues for a long time, the turbine rotor (1
) Table TkJ shows that the turbine rotor (1) may be bent due to abnormal temperature rise (due to causes such as minute non-uniform circumferential creep characteristics of the rotor material). To avoid this,
The low-temperature steam from the first stage rotor blade 1 is returned to the upstream side as shown by the arrow (6) through the balance hole (5) of the turbine rotor (1), and is allowed to flow into the Tsumugi 9 space (4), where it flows into the turbine rotor (1). Among the means for preventing an abnormal temperature rise on the surface of the rotor (1), a hole (not shown) is made, through which low-temperature steam flows into the space (4), and the co-turbine inlet steam with a means for cooling the turbine rotor (llt) is provided. As conditions become higher in temperature and pressure, the turbine rotor (11Th) must be strongly cooled.
ところが、このようにタービンロータ（１）を冷却する
と、ノズルがツクス（２）の内部と外部は温度の異なる
蒸気が流れるため、ノズルボックス（２） 内外面の温
度差が大きくなり、大きな熱応力が発生する０このため
あまり強力な冷却はできなかった。However, when the turbine rotor (1) is cooled in this way, steam with different temperatures flows between the inside and outside of the nozzle box (2), resulting in a large temperature difference between the inside and outside of the nozzle box (2), resulting in large thermal stress. Therefore, very strong cooling was not possible.
これらの解決のためには、耐熱高強度材料の採用は勿論
であるが、それと同時にタービン内の問題となる部分の
局所冷却技術゛が重要となる。To solve these problems, it goes without saying that heat-resistant, high-strength materials must be used, but at the same time, local cooling technology for the problem areas within the turbine is also important.
本発明の目的は、タービンロータを冷却によってそのロ
ータの曲９を防止すると共に、タービンロータ、ノズル
ボックスの強度向上と熱応力低減全針り、高信頼性、高
効率の蒸気タービンを提供することにある。It is an object of the present invention to provide a highly reliable, highly efficient steam turbine that prevents rotor bending by cooling the turbine rotor, improves the strength of the turbine rotor and nozzle box, and reduces thermal stress. It is in.
本発明においてはタービンロータを低温蒸気で冷却する
と共に、ノズルボックスの内周面および外周面の少なく
とも一方を断熱部材で覆うことにより、タービンロータ
の曲シを防止し、タービンロータ、ノズルボックスの強
度向上と熱応力低減全針るものである◇
〔発明の実施例〕
以下、本発明の一実施例について、第２図を参照して説
明する◎尚第２図において、第１図と同一部分には同−
符号食付して説明を省略する・この実施例のノズルボッ
クス（２）はその内局面に内周面側断熱部材（７） ｔ
−ｍｌ付けて、その内周面を覆い、外周面のタービンロ
ータ（１）対向面に外周面側断熱部材（８１ｔ−取付け
て、その外周面を覆う。他は第１図の通シである０
次に作用について説明する。In the present invention, the turbine rotor is cooled with low-temperature steam, and at least one of the inner circumferential surface and outer circumferential surface of the nozzle box is covered with a heat insulating member, thereby preventing the turbine rotor from bending and improving the strength of the turbine rotor and nozzle box. ◇ [Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be explained with reference to Fig. 2. In Fig. 2, the same parts as Fig. 1 are shown. Same as -
The nozzle box (2) of this embodiment has an inner peripheral surface side heat insulating member (7) on its inner surface.
-ml is attached to cover the inner circumferential surface, and an outer circumferential side heat insulating member (81t) is attached to the outer circumferential surface facing the turbine rotor (1) to cover the outer circumferential surface.Others are as shown in Fig. 1. 0 Next, the effect will be explained.
ノズルボックス（２）の内周面管内周面側断熱部材（７
）で覆ったことにより、高温の蒸気上ノズルボックス（
２）内に導入してもノズルボックス（りの温度上昇は低
くなる。さらにその温度の低いノズルボックス（りの外
周面を外周面側断熱部材（８）で覆ったことにより、空
間（４）へ逃げる熱は一段と少なくなる。Nozzle box (2) inner peripheral surface tube inner peripheral surface side insulation member (7
), the nozzle box (
2) Even if the nozzle box is introduced inside the nozzle box, the temperature rise will be low.Furthermore, by covering the outer circumferential surface of the nozzle box, which has a low temperature, with the outer circumferential side heat insulating member (8), the space (4) The amount of heat escaping is further reduced.
従って、バランスホール（５）から導入した低温蒸気は
加熱されることが少なく、タービン四−タ（１） ｔ−
充分冷却して、曲りケ生ずること全防止し、強度を向上
すると共に、ノズルボックス（２）内部の蒸気全高温に
保てるだけでなく、ノズルボックス（２）の温度分布が
比較的低い値で均一化し、熱応力が低減する。従って、
ノズルボックス（２）の強度が向上し、高信頼性、高効
率の蒸気タービンとなる・尚、本発明は上記し、かつ図
面に示した実施例のみに限定されるものではなく、例え
ば断熱部材（７１，（８）は、内周面又は外周面のうち
のいずれか一方だけに用いてもよいし、再熱部入ロスク
Ｖ−ルもノズルボックスと略同様の機能を有しているか
う、ノズルボックスの一変形例と見做してこれに適用し
てもよい等、その要旨全変更しない範囲で、種々変形し
て実施できることは勿論である◎〔発明の効呆〕
以上説明したように、本発明によれば、ノズルボックス
の内周面および外周面の少なくとも一方會断熱部材で覆
ったことにより、タービンロータ、ノズルボックス、パ
ツキンヘッドにより形成される空間に低温蒸気を流入さ
せ、タービンロータ七強力に冷却しても、ノズルボック
スはあまり冷却されず、ノズルボックスに発生する熱応
力は小さく、かつノズルボックス内の蒸気上高温に保つ
ことができるので、高信頼性、高効率の蒸気タービン′
ｔ−提供することができる。Therefore, the low-temperature steam introduced from the balance hole (5) is rarely heated, and the turbine quadrature (1) t-
Sufficient cooling prevents bending and cracking, improves strength, and not only keeps the steam inside the nozzle box (2) at a high temperature, but also keeps the temperature distribution of the nozzle box (2) relatively low and uniform. , reducing thermal stress. Therefore,
The strength of the nozzle box (2) is improved, resulting in a highly reliable and highly efficient steam turbine.The present invention is not limited to the embodiments described above and shown in the drawings; (71, (8) may be used only on either the inner circumferential surface or the outer circumferential surface, and the reheat section entry loss screen V-le may also have approximately the same function as the nozzle box. It goes without saying that the present invention can be modified in various ways without completely changing its gist, such as considering it as a modified example of the nozzle box and applying it thereto. [Effects of the Invention] As explained above, According to the present invention, by covering at least one of the inner circumferential surface and the outer circumferential surface of the nozzle box with a heat insulating member, low-temperature steam can flow into the space formed by the turbine rotor, the nozzle box, and the packing head, and the turbine Even if the rotor is strongly cooled, the nozzle box is not cooled much, the thermal stress generated in the nozzle box is small, and the steam inside the nozzle box can be kept at a high temperature, resulting in highly reliable and highly efficient steam. Turbine′
t-can be provided.
第１図は従来の蒸気タービンのノズルボックスの周辺金
示す縦断面図、１ｇ２図は本発明の蒸気タービンの一実
施例のノズルボックスの周辺ｒ示す縦断面図であるコ
ト・・タービンロータ ２・・・ノズルボックス３・
・・パツキンヘッド ４・・・空間５・・・バランスホ
ール ６・・・低温蒸気の流れ矢印７・・・内周面側
断熱部材 ８・・・外周面側断熱部材代理人 弁理士
井 上 −男Fig. 1 is a longitudinal sectional view showing the periphery of a nozzle box of a conventional steam turbine, and Fig. 1g2 is a longitudinal sectional view showing the periphery of a nozzle box of an embodiment of the steam turbine of the present invention.・Nozzle box 3・
... Packing head 4 ... Space 5 ... Balance hole 6 ... Low-temperature steam flow arrow 7 ... Inner peripheral surface side insulation member 8 ... Outer peripheral surface side insulation member agent Patent attorney Inoue - Man
Claims (1)
よって囲まれた９間内にノズルがツクス内の蒸気より低
温の蒸気會導入してタービンロータ會冷却する蒸気ター
ビンにおいて、ノズルボックスの内周面および外周面の
少なくとも一方管断熱部材で覆ったことｔ−特徴とする
蒸気タービン。In a steam turbine in which a nozzle cools the turbine rotor by introducing steam at a lower temperature than the steam within the nozzle into a space surrounded by a turbine rotor, a nozzle box, and a packing head, the inner and outer peripheral surfaces of the nozzle box are A steam turbine characterized in that at least one side is covered with a tube insulation member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2105082A JPS58140403A (en) | 1982-02-15 | 1982-02-15 | Steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2105082A JPS58140403A (en) | 1982-02-15 | 1982-02-15 | Steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58140403A true JPS58140403A (en) | 1983-08-20 |
Family
ID=12044084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2105082A Pending JPS58140403A (en) | 1982-02-15 | 1982-02-15 | Steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58140403A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1378630A1 (en) * | 2002-07-01 | 2004-01-07 | ALSTOM (Switzerland) Ltd | Steam turbine |
-
1982
- 1982-02-15 JP JP2105082A patent/JPS58140403A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1378630A1 (en) * | 2002-07-01 | 2004-01-07 | ALSTOM (Switzerland) Ltd | Steam turbine |
| WO2004003346A1 (en) * | 2002-07-01 | 2004-01-08 | Alstom Technology Ltd | Steam turbine |
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