CN105422189A - Low stress concentration embedded structure of erosion protection shield for last stage blade of steam turbine - Google Patents
Low stress concentration embedded structure of erosion protection shield for last stage blade of steam turbine Download PDFInfo
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- CN105422189A CN105422189A CN201510969795.1A CN201510969795A CN105422189A CN 105422189 A CN105422189 A CN 105422189A CN 201510969795 A CN201510969795 A CN 201510969795A CN 105422189 A CN105422189 A CN 105422189A
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- erosion protection
- steam turbine
- protection sheild
- last stage
- mosaic
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to the technical field of mechanical structure design of steam turbines for nuclear power plants, in particular to a low stress concentration embedded structure of an erosion protection shield for a last stage blade of a steam turbine, aims to solve the problem that the tops of blades are broken, resulting from initiation and propogation of material fatigue cracks on an embedded structure part, which is caused by the fact that the stress concentration coefficients of the embedded structures of the erosion protection shields at the tops of the last stage and penultimate stage blades are too large, and overcomes defects in the prior art. Through the adoption of the low stress concentration embedded structure, the inherent reliability of the mechanical structure of the blade is improved, the operation safety and the operation reliability of the steam turbine are improved, and the accident of breakage of the top of the last stage blade of the steam turbine is effectively prevented. The embedded structure has been used for a nuclear steam turbine of a Qinshan phase II nuclear power plant, and the effect of the embedded structure is verified in practical engineering.
Description
Technical field
The present invention relates to steam turbine for nuclear power station Design of Mechanical Structure technical field, concrete a kind of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure.
Background technique
Steam turbine is rotary power machinery equipment steam thermal energy being converted into mechanical energy, and last stage vane of steam turbine and second last stage blade (being referred to as exhaust stage blade below) are one of key and fine features, as shown in Figure 1.Water vapor is expansion work in steam turbine, and droplets form is separated out and wetness increased and forms moisture film at fixed blade for steam turbine position.Under the effect of water vapor stream, moisture film departs from and motion from stator blade surface, and it is tens of to hundreds of μm of water droplets to be broken into diameter.During droplets impact its exhaust stage blade surface, become membranaceous by spherical, make blade material generation local plastic deformation and strain hardening at the pressure formed with exhaust stage blade surface of contact.During steam turbine operation droplets impact its continuous action under, blade local material because of fatigue cumulative damage from blade surface depart from formed water droplet erosion (abbreviation water erosion).Water erosion mainly occurs in the leading edge at exhaust stage blade top, the flexuose material deficiency surface caused can cause stress to concentrate and blade profile section area reduces, thus affect blade vibration characteristics, reduce vane stress cross-section area, make that Cascade Aerodynamics worsens, stage efficiency declines, exhaust stage blade top fracture accident can be caused time serious to occur.
Water erosion protection is the ubiquitous difficult problem of last stage vane of steam turbine.For last stage vane of steam turbine water erosion protection, take measure blade and water erosion medium separated at blade increase surface protecting layer at present.Major measure has vane tip to inlay erosion protection sheild, case hardening, electro discharge hardening, coating, E.B surface treatment etc.Erosion protection sheild is inlayed at exhaust stage blade and second last stage blade top, is applicating history measure that is longer, comparatively economy.
Exhaust stage blade and second last stage blade top stellite alloy film mosaic technology technology, generally that machining goes out a L shape cornerite groove on the leading edge and back of the body arc lateral lobe type of vane tip, adopt silver brazing to inlay in a groove by strip two sides cornerite shape stellite alloy film, make stellite alloy film become vane foil part of the whole.Concrete structure is shown in Fig. 2 to Fig. 4
The deficiency that existing exhaust stage blade top stellite alloy film mosaic technology technology exists, the stress concentration factor being stellite alloy film mosaic groove structure is larger, root of notch becomes blade structure reliability weak part, fatigue crack is at this root of notch initiation and propogation, repeatedly cause the generation of last stage vane of steam turbine top fracture accident, comprise home and abroad nuclear power steam turbine last-stage blade.
Summary of the invention
The object of the invention is to there is the excessive fatigue of materials crackle that may cause of stress concentration factor in the initiation and propogation at this mosaic structure position and then the problem that causes vane tip to rupture for existing last stage vane of steam turbine and second last stage blade top erosion protection sheild mosaic structure, overcome the defect of prior art, a kind of last stage vane of steam turbine erosion protection sheild stress concentration degree mosaic structure is provided, prevents the generation of last stage vane of steam turbine top fracture accident.
The present invention is achieved in that
A kind of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure, the leading edge at last stage vane of steam turbine top with carrying on the back, arc lateral lobe type has the erosion protection sheild mosaic groove of L shape cornerite.The erosion protection sheild mosaic groove length of back of the body arc side is L1.The erosion protection sheild mosaic groove length of leading edge is L1+L2, is followed successively by L1 scope and L2 scope by top to root.Fillet R is had at the root of the erosion protection sheild mosaic groove of leading edge.The erosion protection sheild mosaic groove degree of depth is t.The strip two sides cornerite shape stellite alloy film that length is L1, thickness is t is embedded in erosion protection sheild mosaic groove, covers the L1 scope of the back of the body erosion protection sheild mosaic groove of arc side and the erosion protection sheild mosaic groove of leading edge.The L2 scope of the erosion protection sheild mosaic groove of leading edge adopts silver solder welding to fill.
Erosion protection sheild mosaic groove length L1 length as above is 90mm, and fillet R is of a size of 10mm, and erosion protection sheild mosaic groove degree of depth t is 1mm, and the erosion protection sheild mosaic groove length of leading edge is 10mm with the difference L2 of the erosion protection sheild mosaic groove length of back of the body arc side.
The invention has the beneficial effects as follows:
The present invention has following advantage:
(1) last stage vane of steam turbine erosion protection sheild adopts stress concentration mosaic structure, improve the inherent reliability of blade mechanism structure, improve the safety and reliability of steam turbine operation, effectively prevent the generation of last stage vane of steam turbine top fracture accident, there is important Social benefit and economic benefit.
(2) last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure is for Qinshan Second Nuclear Power Plant nuclear steam turbine, and its effect obtains actual engineering verification.
(3) last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure is widely applied in other a part of nuclear power steam turbine last-stage blade optimal design of Chinese nuclear energy electric power limited company.
Accompanying drawing explanation
Fig. 1 is typical last stage vane of steam turbine structural representation;
Fig. 2 is the schematic diagram of typical last stage vane of steam turbine top erosion protection sheild mosaic structure;
Fig. 3 is the Q-Q direction view of typical last stage vane of steam turbine top erosion protection sheild mosaic structure;
Fig. 4 is the T-T direction view of typical last stage vane of steam turbine top erosion protection sheild mosaic structure;
Fig. 5 is the schematic diagram of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure of the present invention;
Fig. 6 is the Q-Q direction view of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure of the present invention;
Fig. 7 is the T-T direction view of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in Figures 5 to 7, a kind of last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure, the leading edge at last stage vane of steam turbine top with carrying on the back, arc lateral lobe type has the erosion protection sheild mosaic groove of L shape cornerite.The erosion protection sheild mosaic groove length of back of the body arc side is L1.The erosion protection sheild mosaic groove length of leading edge is L1+L2, is followed successively by L1 scope and L2 scope by top to root.Fillet R is had at the root of the erosion protection sheild mosaic groove of leading edge.The erosion protection sheild mosaic groove degree of depth is t.The strip two sides cornerite shape stellite alloy film that length is L1, thickness is t is embedded in erosion protection sheild mosaic groove, covers the L1 scope of the back of the body erosion protection sheild mosaic groove of arc side and the erosion protection sheild mosaic groove of leading edge.The L2 scope of the erosion protection sheild mosaic groove of leading edge adopts silver solder welding to fill.
For the last stage vane of steam turbine of concrete model, carry out modeling analysis by existing method or utilize empirical correlation to calculate, determining that fillet R, erosion protection sheild mosaic groove degree of depth t, the back of the body erosion protection sheild mosaic groove length L1 of arc side and the erosion protection sheild mosaic groove length of leading edge are greater than the erosion protection sheild mosaic groove length L2 of back of the body arc side.
(1) exhaust stage blade water erosion hazard assessment
Judge that exhaust stage blade water erosion is dangerous by calculating exhaust stage blade material water eclipse factor E; Mainly contain German KWH, US Westinghouse company and BBC company of Switzerland both at home and abroad and propose water erosion coefficient E empirical correlation.The present invention drops in proportion in whole moisture along the high change curve of leaf according to steam moisture after level and flood, the water erosion coefficient E empirical correlation of the German KWH company adopting degree of accuracy relatively high:
In formula:
E-blade material water erosion coefficient;
Y
0humidity before-level;
P
0steam static pressure before-level, MPa;
D-blade working partial cross section diameter, m;
N-turbine speed, r/min.
Calculate E, evaluation principle is that the blade height scope of E > 0.3 should take water erosion protective measures, draws thus and installs erosion protection sheild alloy groove back of the body arc side length L1 additional.
(2) finite element analysis of mosaic structure
Set up the threedimensional model of exhaust stage blade, adopt ANSYS software to carry out finite element analysis.Keep L1 constant, to the various combination of R, t, L2, calculate exhaust stage blade work stress at rest and dynamic stress.
(3) design optimization of mosaic structure
The stress at rest drawn according to mosaic structure finite element analysis and dynamic stress relative size, and consider the convenience of exhaust stage blade machining, finally obtain R, t and L2, complete the modular in design of erosion protection sheild stress concentration mosaic structure.
Said method is adopted to calculate the embodiment of the concrete numerical value of L1, R, t, L2:
(1) adopt the water erosion coefficient E empirical correlation of KWH company, calculate Qinshan Second Nuclear Power Plant 650MW nuclear steam turbine Optimization-type 479.3mm second last stage blade and install the erosion protection sheild alloy groove back of the body arc side length L1=91.07mm, actual value 90mm additional.
(2) ANSYS software is adopted to carry out finite element analysis, calculate R=10mm, t=1mm (t value is determined according to second last stage blade long-term actual motion water erosion situation) and L2=10mm for optimum: the root of notch maximum stress at rest value in local and maximum power value are respectively 111.9MPa and 1.19MPa, and former design (L1=150mm, t=1.7mm) the root of notch maximum stress at rest value in local and maximum power value are respectively 188.7MPa and 2.387MPa.
Claims (2)
1. a last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure, is characterized in that: the leading edge at last stage vane of steam turbine top with carrying on the back, arc lateral lobe type has the erosion protection sheild mosaic groove of L shape cornerite.The erosion protection sheild mosaic groove length of back of the body arc side is L1.The erosion protection sheild mosaic groove length of leading edge is L1+L2, is followed successively by L1 scope and L2 scope by top to root.Fillet R is had at the root of the erosion protection sheild mosaic groove of leading edge.The erosion protection sheild mosaic groove degree of depth is t.The strip two sides cornerite shape stellite alloy film that length is L1, thickness is t is embedded in erosion protection sheild mosaic groove, covers the L1 scope of the back of the body erosion protection sheild mosaic groove of arc side and the erosion protection sheild mosaic groove of leading edge.The L2 scope of the erosion protection sheild mosaic groove of leading edge adopts silver solder welding to fill.
2. last stage vane of steam turbine erosion protection sheild stress concentration mosaic structure according to claim 1, it is characterized in that: described erosion protection sheild mosaic groove length L1 length is 90mm, fillet R is of a size of 10mm, erosion protection sheild mosaic groove degree of depth t is 1mm, and the erosion protection sheild mosaic groove length of leading edge is 10mm with the difference L2 of the erosion protection sheild mosaic groove length of back of the body arc side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510969795.1A CN105422189A (en) | 2015-12-21 | 2015-12-21 | Low stress concentration embedded structure of erosion protection shield for last stage blade of steam turbine |
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| CN201510969795.1A CN105422189A (en) | 2015-12-21 | 2015-12-21 | Low stress concentration embedded structure of erosion protection shield for last stage blade of steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023507A (en) * | 2017-05-25 | 2017-08-08 | 合肥皖化电泵有限公司 | Blade used in a kind of BCP impellers of pump |
| CN109944646A (en) * | 2019-04-04 | 2019-06-28 | 哈尔滨汽轮机厂有限责任公司 | The bypassing method of blade risk in the transformation of thermal power steam turbine group low pressure (LP) cylinder zero energy |
| CN114000923A (en) * | 2021-09-28 | 2022-02-01 | 中国船舶工业集团公司第七0八研究所 | Composite material turbo machinery impeller |
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| JPS62180045A (en) * | 1986-02-03 | 1987-08-07 | Hitachi Ltd | Moving blade for low pressure turbine |
| JPS63168272A (en) * | 1987-01-06 | 1988-07-12 | Mitsubishi Heavy Ind Ltd | Laser repairing method |
| CN103603695A (en) * | 2011-12-31 | 2014-02-26 | 无锡透平叶片有限公司 | Blade alloy groove and processing method thereof |
| CN205349428U (en) * | 2015-12-21 | 2016-06-29 | 中核核电运行管理有限公司 | Steam turbine last stage blade erosion protection sheild hangs down stress concentration mosaic structure |
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2015
- 2015-12-21 CN CN201510969795.1A patent/CN105422189A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62180045A (en) * | 1986-02-03 | 1987-08-07 | Hitachi Ltd | Moving blade for low pressure turbine |
| JPS63168272A (en) * | 1987-01-06 | 1988-07-12 | Mitsubishi Heavy Ind Ltd | Laser repairing method |
| CN103603695A (en) * | 2011-12-31 | 2014-02-26 | 无锡透平叶片有限公司 | Blade alloy groove and processing method thereof |
| CN205349428U (en) * | 2015-12-21 | 2016-06-29 | 中核核电运行管理有限公司 | Steam turbine last stage blade erosion protection sheild hangs down stress concentration mosaic structure |
Non-Patent Citations (2)
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| 姚一伟: "《100MW汽轮机末级水蚀叶片现场修复工艺》", 《热力发电》 * |
| 葛海华: "《650MW核电汽轮机低压次末级动叶片司太立合金片裂纹缺陷的分析与处理》", 《机械工程师》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023507A (en) * | 2017-05-25 | 2017-08-08 | 合肥皖化电泵有限公司 | Blade used in a kind of BCP impellers of pump |
| CN109944646A (en) * | 2019-04-04 | 2019-06-28 | 哈尔滨汽轮机厂有限责任公司 | The bypassing method of blade risk in the transformation of thermal power steam turbine group low pressure (LP) cylinder zero energy |
| CN114000923A (en) * | 2021-09-28 | 2022-02-01 | 中国船舶工业集团公司第七0八研究所 | Composite material turbo machinery impeller |
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Application publication date: 20160323 |