JPS597705A - Moving blade of steam turbine - Google Patents
Moving blade of steam turbineInfo
- Publication number
- JPS597705A JPS597705A JP11536282A JP11536282A JPS597705A JP S597705 A JPS597705 A JP S597705A JP 11536282 A JP11536282 A JP 11536282A JP 11536282 A JP11536282 A JP 11536282A JP S597705 A JPS597705 A JP S597705A
- Authority
- JP
- Japan
- Prior art keywords
- rotor blade
- amorphous metal
- moving blade
- corrosion
- 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.)
- 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/288—Protective coatings for blades
Abstract
Description
【発明の詳細な説明】
本発明は、蒸気タービンの動員に係り、湿り域段落にお
ける蒸気中の水滴によシ、タービン動翼が侵食されるの
全防止する蒸気タービン動翼に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to steam turbine mobilization, and relates to a steam turbine rotor blade that completely prevents erosion of the turbine rotor blade by water droplets in the steam in a wet zone stage.
復水型蒸気タービンの排気室は、タービン運転中、常時
、大気圧以下の真空に保持され、最終段落の動翼入口、
及び出口の蒸気は水滴を含んだ湿シ域でらり、またこの
最終段より２〜３前段落でもすでに湿り域に入ることは
周知である。この湿ｐ域での蒸気中に含まれている水滴
は、回転中の動翼の入口端と衝突することとなり、動員
が侵食され、動翼入口端はノコギリ刃状の水滴コロ−ジ
ョン部が発生することとなる。この水滴による侵食を防
止する為に、最近の大型タービンでは、第１図乃至第３
図に示すように、ｃｏを主成分とした、一般にステライ
トと呼ばれる高硬度合金を侵食防止板２として動翼１に
溶接する方法がとられている。しかしこの方法では、動
翼母材１と侵食防止板２とが異材でろる為に溶接の際、
侵食防止板２に引張シの残留応力が生ずることとなりこ
れが応力腐食割れの原因となる。また、ステライトは動
翼材に比べ耐腐食性は良好であるが、蒸気中の水滴によ
る侵食は完全に防ぎきれず、侵食が大となった際には、
侵食防止板２の張替えが必要となる。応力腐食割れある
いは侵食全完全に防止するためには、第４図に示すよう
にガスタービン動翼等に適用が知られているセラミック
コーテイング４が考えられる。セラミックは、蒸気ター
ビンに現在用いられているステライトに比べ、耐腐食性
、耐摩耗性が著しく良好である。しかし、セラミックは
ステライトに比べ靭性は低く、また熱膨張率が小さいた
め、最近の大聖蒸気タービンでは最終段落の動ＸＩの大
きな曲げ応力おるいは振動により、また温度変化によｐ
ｌ セラミックコーティング４にＩＩ！が発生する可能
性があり、大型蒸気タービンには採用出来かい。The exhaust chamber of a condensing steam turbine is maintained at a vacuum below atmospheric pressure at all times during turbine operation.
It is well known that the steam at the outlet exits in a humid zone containing water droplets, and that it already enters the humid zone at two or three stages before the final stage. The water droplets contained in the steam in this humid p region collide with the inlet end of the rotating rotor blade, and the mobilization is eroded, resulting in a sawtooth-shaped water droplet corrosion part at the rotor blade inlet end. This will occur. In order to prevent erosion caused by water droplets, recent large turbines are equipped with
As shown in the figure, a method is used in which a high-hardness alloy, generally called stellite, containing cobalt as a main component is welded to the rotor blade 1 as an erosion prevention plate 2. However, with this method, the rotor blade base material 1 and the erosion prevention plate 2 are made of different materials and are difficult to weld.
A tensile residual stress is generated in the erosion prevention plate 2, which causes stress corrosion cracking. In addition, although Stellite has better corrosion resistance than rotor blade materials, it cannot completely prevent corrosion by water droplets in steam, and when corrosion becomes large,
It is necessary to replace the erosion prevention plate 2. In order to completely prevent stress corrosion cracking or erosion, a ceramic coating 4, which is known to be applied to gas turbine rotor blades, as shown in FIG. 4, can be considered. Ceramic has significantly better corrosion and wear resistance than stellite, which is currently used in steam turbines. However, ceramic has lower toughness than stellite and has a lower coefficient of thermal expansion, so in recent Daisei steam turbines, ceramics are susceptible to large bending stresses or vibrations in the final stage, and due to temperature changes.
l Ceramic coating 4 to II! may occur, so it cannot be used in large steam turbines.
本発明の目的は、耐腐食性、耐摩耗性を有すると共に、
靭性に優れた侵食防止板を備えた蒸気タービン動員全提
供することにある。本発明の要旨とするところは、ター
ビン動翼を侵食防止の目的で、ステライトの侵食防止板
あるいはセラミックコーティングにかわるものとして、
非晶質金属を採用することである。Ｃｒｆ含むＦｓ基あ
るい杖Ｎｉ基非晶質金属は、結晶質のステンレス鋼、ス
テライト等に比べて結晶粒界がなくそのため［固な不働
態膜を形成するので、セラミックに対応する耐腐食性を
有し、また、硬度も大きく耐摩耗性に優れていることは
よく知られている。そのため、上記の非晶質金属を動翼
の耐侵食材として採用した場合、湿り域での蒸気中の水
滴による非晶質金属の侵食は従来のステライトに比べ著
しく小さくなる。また、上記の非晶質金属は、高硬度に
もかかわらず靭性に富む為、動翼の曲げ応力、振動によ
ｐき裂は生ずることはない。The purpose of the present invention is to have corrosion resistance, wear resistance, and
Our objective is to provide a complete steam turbine assembly equipped with an erosion prevention plate with excellent toughness. The gist of the present invention is to provide a turbine rotor blade with an anti-erosion plate or a ceramic coating in place of a stellite anti-erosion plate or a ceramic coating for the purpose of preventing erosion of a turbine rotor blade.
The solution is to use amorphous metal. Compared to crystalline stainless steel, stellite, etc., Fs-based or Ni-based amorphous metals containing Crf have no grain boundaries and therefore form a hard passive film, resulting in corrosion resistance comparable to that of ceramics. It is well known that it has high hardness and excellent wear resistance. Therefore, when the above-mentioned amorphous metal is employed as an anti-erosion material for a rotor blade, the erosion of the amorphous metal by water droplets in steam in a humid region is significantly smaller than that of conventional stellite. Furthermore, since the amorphous metal described above has high toughness despite its high hardness, p-cracks will not occur due to bending stress and vibration of the rotor blade.
上記の非晶質金属の形成には、凝固時に毎秒１０６度以
上の冷却速度を必要とする為、通常片ロール法あるいは
両ロール法が利用され、その形状は、１００μｍ以下の
薄膜帯状であることはよく知られている。このような非
晶質金属を動翼の侵食防止材として利用する場合には、
ステライ）１−動翼に溶接により取付ける方法と同様に
薄膜帯状非晶質金属を動翼に溶接で取付ける方法が考え
られる。しかし、非晶質金属は、約３００Ｃ以上の温度
で結晶化が起シその非晶質金属の特有の耐腐食性、耐摩
耗性及び高靭性は失われる為、作成された非晶質金属を
動翼に溶接して侵食防止材とすることは出来ない。To form the amorphous metal mentioned above, since a cooling rate of 106 degrees per second or higher is required during solidification, a single roll method or a double roll method is usually used, and the shape is a thin film strip of 100 μm or less. is well known. When using such amorphous metal as an erosion prevention material for rotor blades,
Stellai) 1 - Similar to the method of attaching a thin film band-shaped amorphous metal to a rotor blade by welding, a method of attaching a thin film band-shaped amorphous metal to a rotor blade by welding can be considered. However, amorphous metals crystallize at temperatures above about 300C and lose their characteristic corrosion resistance, wear resistance, and high toughness. It cannot be used as an erosion prevention material by welding to rotor blades.
そこで本発明は、上記の対策として、直接非晶質金属を
動翼表面上に形成させ、その形成された非晶質金属層を
侵良材止材として利用することを特徴とする。す彦わち
、上記の片ロール法おるいは両ロール法以外に非晶質作
成法として知られている溶射法により、形成される非晶
質金属と同一成分の粉末結晶質金属を溶解し、動翼表面
上に叩き付けることにより、動翼表面上に非晶質層を形
成させ、その形成された非晶質層を侵食防止材とする。Therefore, as a measure against the above problem, the present invention is characterized in that an amorphous metal is directly formed on the surface of the rotor blade, and the formed amorphous metal layer is used as an anti-corrosion material. In other words, in addition to the one-roll method or the double-roll method mentioned above, a thermal spraying method known as an amorphous preparation method is used to melt powdered crystalline metal having the same composition as the amorphous metal to be formed. By striking the surface of the rotor blade, an amorphous layer is formed on the surface of the rotor blade, and the formed amorphous layer is used as an erosion prevention material.
以下、本発明の一実施例を第５図によｐ説明する。An embodiment of the present invention will be described below with reference to FIG.
動翼ｌにＣｒ含有ｐｅ基非晶質金属コーティング５と同
一成分の結晶質合金を原材料として非晶質金属作製法と
して知られている溶射法によシ吹き付け、図５に示すよ
うに、動翼１上に非晶質金属コーティング５を形成させ
る。ここで動翼ｌは、非晶質金属全形成させるため液体
窒素上吹き付けることにより冷却しておく。A crystalline alloy having the same composition as the Cr-containing PE-based amorphous metal coating 5 is sprayed onto the rotor blade l by a thermal spraying method known as an amorphous metal manufacturing method, as shown in FIG. An amorphous metal coating 5 is formed on the wing 1. Here, the rotor blade 1 is cooled by blowing on liquid nitrogen to completely form amorphous metal.
上記の方法で、非晶質金属コーティング５を動翼１に形
成させると動翼１は、完全に非晶質金属コーティングで
覆われ、そのため前項で説明し九通り動翼ｌの耐侵食性
は向上する。また、非晶質金属を形成するために動翼を
冷却することにより、動翼１は熱的影響上受けず、その
ため動翼１の信頼性は向上する。When the amorphous metal coating 5 is formed on the rotor blade 1 by the above method, the rotor blade 1 is completely covered with the amorphous metal coating, so that the erosion resistance of the rotor blade l is improves. Moreover, by cooling the rotor blades to form an amorphous metal, the rotor blades 1 are not affected by thermal effects, and therefore the reliability of the rotor blades 1 is improved.
本発明によれば、湿ｐ域の蒸気中の水滴による侵食及び
、応力腐食割れ等を、従来の００を主成分とした高硬度
合金（ステライト］の侵食防止板に比べ著しく減少でき
るので、動翼の信頼性、保守性の向上に効果がある。ま
た、侵食による動翼の形状変化に伴う性能低下を防止す
る。According to the present invention, corrosion due to water droplets in steam in the humid P region, stress corrosion cracking, etc. can be significantly reduced compared to the conventional erosion prevention plate made of a high hardness alloy (Stellite) mainly composed of 00. It is effective in improving the reliability and maintainability of blades.It also prevents performance deterioration due to changes in the shape of rotor blades due to erosion.
第１図は、従来例の高硬度合金侵食防止板を採用したタ
ービン動翼の正面図、第２図は第１図のＡ−Ａ断面図、
第３図は第２図Ｂ部の詳細図、第４図は動翼にセラ５ツ
タコーテイングし九タービン動真の断面図、第５図は本
発明の一実施例である動翼表面上に直接非晶質金属層を
形成させたタービン動翼の断面図である。
１・・・動翼、２・・・侵食防止板、３・・・溶接部、
４・・・セ第／届 褒ＺｌｊＪ
２７−Fig. 1 is a front view of a turbine rotor blade employing a conventional high-hardness alloy corrosion prevention plate, Fig. 2 is a sectional view taken along line A-A in Fig. 1,
Fig. 3 is a detailed view of part B in Fig. 2, Fig. 4 is a sectional view of a nine-turbine moving shaft with Cera5 ivy coating on the rotor blade, and Fig. 5 is a detailed view of the rotor blade surface, which is an embodiment of the present invention. FIG. 2 is a cross-sectional view of a turbine rotor blade on which an amorphous metal layer is directly formed. 1... Moving blade, 2... Erosion prevention plate, 3... Welded part,
4...Second/Delivery Award ZljJ 27-
Claims (1)
グするようにした蒸気タービン動翼。 ２ 前記耐食性非晶質金属を溶射法によジタービン動翼
表面にコーティングするようにした特許請求の範囲第１
項記載の蒸気タービン動翼。 ３、前記耐食性非晶質金属である溶融金属をタービン動
翼表面で急冷凝固させることによりタービン動翼表面を
コーティングするようにした特許請求の範囲第１項記載
の蒸気タービン動翼。[Claims] L. A steam turbine rotor blade in which the entire surface of the turbine rotor blade is coated with a corrosion-resistant amorphous metal. 2. Claim 1, wherein the corrosion-resistant amorphous metal is coated on the surface of the diturbine rotor blade by a thermal spraying method.
The steam turbine rotor blade described in . 3. The steam turbine rotor blade according to claim 1, wherein the surface of the turbine rotor blade is coated by rapidly cooling and solidifying the molten metal, which is the corrosion-resistant amorphous metal, on the surface of the turbine rotor blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11536282A JPS597705A (en) | 1982-07-05 | 1982-07-05 | Moving blade of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11536282A JPS597705A (en) | 1982-07-05 | 1982-07-05 | Moving blade of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS597705A true JPS597705A (en) | 1984-01-14 |
Family
ID=14660642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11536282A Pending JPS597705A (en) | 1982-07-05 | 1982-07-05 | Moving blade of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS597705A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8132414B2 (en) | 2005-10-31 | 2012-03-13 | Kabushiki Kaisha Toshiba | Steam turbine and hydrophilic coating material used therefor |
-
1982
- 1982-07-05 JP JP11536282A patent/JPS597705A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8132414B2 (en) | 2005-10-31 | 2012-03-13 | Kabushiki Kaisha Toshiba | Steam turbine and hydrophilic coating material used therefor |
| AU2009217388B2 (en) * | 2005-10-31 | 2012-08-16 | Kabushiki Kaisha Toshiba | Steam turbine and hydrophilic coating material used therefor |
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