CN1417370A - Spraying process of water erosion resisting coating for water turbine vanes - Google Patents
Spraying process of water erosion resisting coating for water turbine vanes Download PDFInfo
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- CN1417370A CN1417370A CN01135887A CN01135887A CN1417370A CN 1417370 A CN1417370 A CN 1417370A CN 01135887 A CN01135887 A CN 01135887A CN 01135887 A CN01135887 A CN 01135887A CN 1417370 A CN1417370 A CN 1417370A
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- blade
- coating
- spraying
- water
- water erosion
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Abstract
The spraying process of water erosion resisting coating for water turbine vanes includes repair welding, sand blasting, spraying transition layer, applying pore sealing agent and vane protecting steps. It has high binding strength between the coating and vane surface resulting in coating life as long as four years and without peeling, leads to low use cost and is suitable for vanes operating in wet steam area and last stage vanes operating in low load condition.
Description
Technical field:
The present invention relates to the multistage foil assembly of a kind of steam turbine or nuclear power generating sets, relate to a kind of spraying coating process of blade water erosion-proof coating specifically.
Background technology:
The final stage of steam turbine and secondary multistage blade with nuclear power generating sets be all in wet-steam region work, when wet steam flow during to stator blades, the sub-fraction water droplet is arranged since the effect aggregation of mass force on the surface of blade with, especially at the intrados of stator blade leading edge.The water droplet of stator blade surface aggregation will form moisture film, constantly flow to exit edge from blade surface, form the big water droplet suitable with trailing edge thickness, water droplet flows into rotor blade before by refinement with steam, the water droplet of refinement is accelerated to friction-motion speed by steam and impacts rotor blade, causes the water erosion of rotor blade leading edge.
Turbine driven set often needs the peak regulation running at present, therefore last stage blade often is in underload, high back pressure work down, and when being reduced to a certain value with volumetric flow rate, the movable vane root produces the separation of flow, make movable vane root exit edge water brush phenomenon occur, aggravated the damage of rotor blade.The breakage of rotor blade not only can make stage efficiency descend, and owing to produce the fracture that water erosion may cause blade, from causing unit vibration, makes the unit safety reliability be subjected to very big influence.Therefore say that the anti-water erosion problem of blade is the hard nut to crack of puzzlement steam turbine manufacturing always.For addressing this problem, each steamer mechanism factory adopts electrospark impregnation and weldering department to make very much the way of alloy slice prevent water erosion more, makes its complex process, and effect is not good enough.
Summary of the invention:
The objective of the invention is water erosion problem, and a kind of spraying coating process of anti-water erosion layer is provided for solution steam turbine blade leading edge, thus the work-ing life of improving rotor blade.
Technical solution of the present invention adopts following processing step to finish:
A, repair welding: at first blade is carried out repair welding, the reblading molded lines into and out of the serious position of vapour limit water erosion;
B, sandblast: select the Buddha's warrior attendant sand blasting about 60 orders to sweep blade reparation position, " activation " blade surface becomes frosting;
C, blade protection:
Before the blade sprayed coating, can smear the yellow glycerine of protection on the surface of non-spraying part;
D, spray transition layer: select the material identical for use, the repair materials of fusing is sprayed transition layer to repairing the position by arc-spraying machine, air compressor machine with blade;
E, sprayed coating: choosing the spraying material is two strands of fuses of NicrsiB nickel chromium triangle silicon boron, is contained in respectively on the electrode holder clip, send fuse automatically by arc-spraying machine, and the pressurized air by air compressor machine sprays to blade surface with the spray material of fusing and forms water erosion-proof coating;
F, be coated with hole sealing agent: coating-Ti alloy water or 823 water on sprayed coating, again by smearing paraffin wax on the coating; Blade repaired promptly finish.
Described water erosion-proof coating total thickness is 0.3～0.6mm.
The characteristics that water erosion resisting coating for water turbine vanes of the present invention has are:
1, the spraying material of choosing is imitative magnetic material nickel chromium triangle silicon boron, makes the bonding strength height of coating and blade surface, can not produce obscission, and its coating life can reach more than 4 years and (surpass an overhaul phase);
2, spraying is to implement under cold conditions, and blade is not needed preheating, has reduced the influence to Blade Properties;
3, in the process of implementing spraying, the blade heating temperature can not influence the mechanicalness of blade material below 200 ℃;
4, total coating thickness influences very little to the rotor dynamic balancing precision in 0.3～0.6mm scope.
5, this spraying coating process method is applicable to the real coating that adds of new, old blade;
6, spraying process can not influence the overhaul duration because of the blade spraying as a grade blade is only needed two working dayss;
7, adopt the spraying method reblading to be equivalent to buy 1/3～1/6 of new blade cost, can reduce the production cost of enterprise.
Embodiment:
Processing step:
A, repair welding: at first blade is carried out repair welding into and out of the serious blade of vapour limit water erosion, with the reblading molded lines;
B, sandblast: rotor is winched to zero rice platform, level places on the carriage, and protect axle journal with soft cloth, then the silicon carbide about 60 orders is put into container, open air compressor machine (rated pressure is at 0.6mpa), by sand-blasting gun the Buddha's warrior attendant sand blasting is swept by the blade edge of water erosion, destroy by the water erosion position, sandblast simultaneously also makes blade surface " activation " become frosting;
C, blade protection:
Blade can be smeared on the surface at non-spraying position and anti-smear yellow glycerine and protect before sprayed coating, in order to avoid the coating in the spraying and change original surface;
D, spray transition layer: according to the blade of unlike material, select identical material for use, can select to be fit to the Nicr welding rod, the pressurized air by arc-spraying machine, air compressor machine with the buffer layer material of fusing to repairing position spray transition layer;
E, sprayed coating: adopt special-purpose protection body to cover blade non-spraying surface, accurate to guarantee the spraying position, choosing the spraying material is two strands of fuses of NicrsiB nickel chromium triangle silicon boron, be contained in respectively on the electrode holder clip, after the igniting, automatically send fuse by arc-spraying machine, the pressurized air of the spray material that is melted by air compressor machine sprays to the spray material of fusing and forms water erosion-proof coating on the blade surface, and its coat-thickness is in 0.3～0.6 scope;
F, be coated with hole sealing agent: coating-Ti alloy water or 823 water on the sprayed coating after the reparation, finish by smearing paraffin wax on the coating and blade being repaired promptly again.
Claims (2)
1, the spraying coating process of water erosion resisting coating for water turbine vanes, it comprises following processing step:
A, repair welding: at first blade is carried out repair welding into and out of water erosion position, vapour limit, the reblading molded lines;
B, sandblast are selected the Buddha's warrior attendant sand blasting about 60 orders to sweep blade and are repaired the position, activate blade surface and become frosting;
C, blade protection: blade can be smeared the yellow glycerine of protection on the surface of non-spraying part before spraying;
D, spray transition layer: select the material identical for use, the repair materials of fusing is sprayed transition layer to repairing the position by electric arc machine, air compressor machine with blade;
E, sprayed coating: choosing the spraying material is the fuse of NicrsiB nickel chromium triangle silicon boron material, is contained in respectively on the electrode holder clip, send fuse automatically by arc-spraying machine, and the pressurized air by air compressor machine sprays to blade surface with the spray material of fusing and forms anti-water erosion layer;
F, be coated with hole sealing agent: coating-Ti alloy water or 823 water on sprayed coating, by smearing paraffin wax on the coating, blade is repaired promptly finished again.
2, by the spraying coating process of the described water erosion resisting coating for water turbine vanes of claim, it is characterized in that described water erosion-proof coating thickness is in 0.3～0.6mm scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01135887A CN1417370A (en) | 2001-11-05 | 2001-11-05 | Spraying process of water erosion resisting coating for water turbine vanes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01135887A CN1417370A (en) | 2001-11-05 | 2001-11-05 | Spraying process of water erosion resisting coating for water turbine vanes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1417370A true CN1417370A (en) | 2003-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01135887A Pending CN1417370A (en) | 2001-11-05 | 2001-11-05 | Spraying process of water erosion resisting coating for water turbine vanes |
Country Status (1)
| Country | Link |
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| CN (1) | CN1417370A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551197B (en) * | 2009-05-14 | 2012-04-18 | 瓮福（集团）有限责任公司 | A pyrite-based sulphuric acid roaster cooling calandria repairing method |
| CN101566077B (en) * | 2009-06-04 | 2012-05-02 | 湖南省湘电锅炉压力容器检验中心有限公司 | Last stage vane of steam turbine and preparation method thereof |
| US8845281B2 (en) | 2008-06-12 | 2014-09-30 | General Electric Company | Centrifugal compressor for wet gas environments and method of manufacture |
| CN104858607A (en) * | 2015-04-24 | 2015-08-26 | 湘潭杰熙环境科技有限责任公司 | Full-repairing technology for housing of desulphurization circulating pump |
| CN113025944A (en) * | 2021-03-04 | 2021-06-25 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
-
2001
- 2001-11-05 CN CN01135887A patent/CN1417370A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8845281B2 (en) | 2008-06-12 | 2014-09-30 | General Electric Company | Centrifugal compressor for wet gas environments and method of manufacture |
| CN102119052B (en) * | 2008-06-12 | 2015-11-25 | 通用电气公司 | For centrifugal compressor and the preparation method of wet gas environments |
| CN101551197B (en) * | 2009-05-14 | 2012-04-18 | 瓮福（集团）有限责任公司 | A pyrite-based sulphuric acid roaster cooling calandria repairing method |
| CN101566077B (en) * | 2009-06-04 | 2012-05-02 | 湖南省湘电锅炉压力容器检验中心有限公司 | Last stage vane of steam turbine and preparation method thereof |
| CN104858607A (en) * | 2015-04-24 | 2015-08-26 | 湘潭杰熙环境科技有限责任公司 | Full-repairing technology for housing of desulphurization circulating pump |
| CN113025944A (en) * | 2021-03-04 | 2021-06-25 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
| CN113025944B (en) * | 2021-03-04 | 2023-01-13 | 哈动国家水力发电设备工程技术研究中心有限公司 | Corrosion protection method for movable guide vane of seawater pump water turbine |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |