EP3000977A1 - Aube de turbine dotée de pales revêtues d'une couche hydrophobe - Google Patents

Aube de turbine dotée de pales revêtues d'une couche hydrophobe Download PDF

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Publication number
EP3000977A1
EP3000977A1 EP15184244.0A EP15184244A EP3000977A1 EP 3000977 A1 EP3000977 A1 EP 3000977A1 EP 15184244 A EP15184244 A EP 15184244A EP 3000977 A1 EP3000977 A1 EP 3000977A1
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EP
European Patent Office
Prior art keywords
blade
airfoil
coating
water
droplet size
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.)
Granted
Application number
EP15184244.0A
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German (de)
English (en)
Other versions
EP3000977B1 (fr
Inventor
Florian Eder
Marek Maleika
Norbert Scheunert
Heinrich Zeininger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens AG
Siemens Corp
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Publication date
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Publication of EP3000977A1 publication Critical patent/EP3000977A1/fr
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Publication of EP3000977B1 publication Critical patent/EP3000977B1/fr
Not-in-force legal-status Critical Current
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/512—Hydrophobic, i.e. being or having non-wettable properties

Definitions

  • the invention relates to a blade of a turbine whose blade has at least partially a coating.
  • the invention also relates to a method for producing such a blade.
  • the invention is particularly applicable to vanes of a steam turbine.
  • the water banners forming at the trailing edges of the vanes are entrained by the flow in the form of larger drops of water, so-called secondary drops with diameters between 50 and 400 micrometers. Due to their size and mass and the accompanying inertia, these drops can follow the flow only very bad and hit with high relative speed on the leading edges of the rotating blades.
  • the locally very high energy input leads to the formation of cracks on the blade surface and continuous drop impact causes a material removal at the leading edges of low pressure blades.
  • the consequences of drop impact erosion and resulting damage to the blades are decrease the efficiency of the steam turbine and increased maintenance.
  • DE 696 24 971 T2 discloses a fouling-preventing coating in turbomachinery having a metal surface, comprising: a first hardened layer of an inorganic-phosphate adherent ceramic material as a sacrificial anode in contact with the surface, a second hardened layer in contact with the first layer and a binder comprising inorganic phosphate or silicate and which is nonconductive and does not serve as a sacrificial anode, and a cured overcoat having a thermally stable organic polymer sealant.
  • DE 196 07 979 A1 discloses an exhaust tract of a combustion device which can be used in particular for the combustion of heavy oil.
  • This exhaust tract is intended to solve the problem of reducing the accumulation of dirt layers in the exhaust gas tract of a combustion device which can be used in particular for the combustion of heavy oil and on the components arranged in the exhaust tract for utilization of the exhaust gas energy of the combustion device. This is to be achieved by arranging an anti-adhesion coating on the surface of the at least one component arranged for utilization of the exhaust gas energy in the exhaust tract or at least one of these components and / or on the surface of the exhaust tract itself.
  • DE 37 24 626 A1 discloses a coated steam turbine blade, characterized by the actual airfoil and a single layer hard wear resistant ceramic coating or multilayer coating consisting of an active metal underlayer such as Cr and Ti and a ceramic topcoat, the ceramic coating being ion plating is formed.
  • a method according to DE 37 24 626 A1 is used to coat a blade for steam turbines, characterized by surface treatment of the blade surface, until the surface roughness to Rmax 1-2 S and by forming a single layer or multilayer ceramic coating by ion plating.
  • WO 98/18977 discloses a coating for components, wherein the boundary surfaces of each component are roughened and thereon at least partially applied a coating of non-wettable amorphous carbon. As a result, a coating is to be created with which the formation of liquid films on the boundary surfaces of components and the formation of solid deposits can be avoided. Also disclosed is a method of making a coating wherein the boundary surfaces of each device are roughened and at least one non-wettable amorphous carbon coating is applied thereon.
  • DE 100 56 241 A1 discloses a low pressure turbine having vanes and blades whose airfoils have a coating that is hydrophobic or water repellent and has a smooth surface.
  • the coating contains amorphous carbon.
  • the hydrophobic nature of the coating causes small droplets in the vapor phase to roll over the airfoil as small droplets upon impact with a coated airfoil and continue to follow the flow of steam. This prevents moisture losses and increases the efficiency of the turbine. It also prevents the small droplets on the blades from coalescing into larger drops or a liquid film. Drop impact erosion on blades and other components of the turbine by large drops is thereby avoided.
  • the object is achieved by a blade, in particular a guide vane, of a turbine, in particular a steam turbine, whose airfoil at least in some areas has a coating (hereinafter referred to as "water droplet size-reducing" coating without limiting the generality) whose water retreatment angle is at least 40 °.
  • Such a blade in particular a vane, has the advantage that it is reliably able to keep small drops of water dissolving from its trailing edge of the guide vanes, in particular with mean droplet sizes of a few micrometers or even less. It is exploited that a water retreatment angle of at least 40 ° leads to the fact that even the smallest droplets can move on the coating, without having to first join together to larger accumulations of water. As a result, even small and smallest droplets reach the vane edges and detach there without having to achieve a minimum size by further merging. Such small drops of water can be largely or even practically completely taken by a steam flow in a steam turbine so strong that they no longer hit on associated blades.
  • the water retreatment angle of at least 40 ° also enables the use of low-cost water droplet size-reducing coatings, which can also be easily applied to an airfoil.
  • the water retraction angle can be measured in particular by the static drop method.
  • the water retreatment angle is at least 45 °, in particular at least 50 °, in particular at least 55 °.
  • a particularly preferred embodiment has resulted in a water retreatment angle of at least 60 °.
  • the water retreatment angle may be even greater, e.g. at least 65 ° or at least 70 °.
  • the coating consists of at least one high-temperature-resistant polymer having a small number of polar groups.
  • Such polymers are easy and inexpensive to obtain and apply to the airfoil.
  • they show no decomposition under hydrolytic influences.
  • the small number of polar groups may also include an absence of polar groups.
  • At least one polymer having at least one at least partially fluorinated hydrocarbon may, for example, comprise at least one fluoroplastic, in particular at least one polyhaloolefin, eg polytetrafluoroethylene (abbreviation PTFE) and / or polychlorotrifluoroethylene (abbreviation PCTFE).
  • PTFE polytetrafluoroethylene
  • PCTFE polychlorotrifluoroethylene
  • PTFE polytetrafluoroethylene
  • PCTFE polychlorotrifluoroethylene
  • PTFE is very resistant to many chemicals and temperature resistant up to approx. 260 ° C.
  • PTFE also has a very low coefficient of friction.
  • the static friction is as great as the sliding friction, so that the transition from standstill to movement takes place without jerk.
  • PCTFE polystyrene-co-styrene-co-styrene
  • a preferred range of use of based on at least partially fluorinated hydrocarbons polymers ranges from about 100 ° C to about 180 ° C.
  • At least one polymer has at least one polyoleofin.
  • Polyoleofin are particularly inexpensive and easy to handle.
  • a preferred range of use of polyolefins ranges up to about 100 ° C.
  • Examples of voidable polyolefins include polyethylene and / or polypropylene.
  • At least one polymer having at least one polyether ketone, at least one polyimide and / or at least one polysulfone.
  • a preferred field of application of these polymers begins at about 200 ° C.
  • the water droplet size-reducing coating has been prepared with at least one organosilicon precursor.
  • the precursor has in particular only non-polar groups.
  • An organosilicon precursor also has no decomposition under hydrolytic influences in a typical environment for a low-pressure region of a steam turbine.
  • At least one silicon-organic precursor has been applied, which subsequently crosslinks densely.
  • the groups of the precursor preferably remain largely intact, so they essentially do not change chemically.
  • the precursor at least one alkyl group, at least one aryl group and / or at least a cycloaromatic group, in particular benzyl group.
  • the at least one organosilicon precursor at least one siloxane, in particular hexamethyldisiloxane and / or octamethylcyclosiloxane having.
  • a water contact angle is at least 50 °, in particular at least 75 °.
  • the mobility of the water on the blade can be further increased.
  • the waterdrop size reducing coating may be hydrophobic, but need not be so to achieve the small droplet size.
  • the water contact angle may therefore be e.g. be less than 90 °, in particular less than 85 °, in particular less than 80 °.
  • the water droplet size-reducing coating is applied to a corrosion protection surface of the airfoil. This can reduce or even prevent corrosive damage to the airfoil, which results in an average droplet size of the water droplets separating from the vane.
  • the application of the water droplet size-reducing coating may, for example, be carried out wet-chemically or in the context of a plasma process.
  • the plasma process may be e.g. Use atmospheric pressure plasma or low pressure plasma.
  • a coating may also be done by painting (with solvent or by using powder coating), spraying, or foiling.
  • the corrosion protection surface is a surface of a corrosion protection layer, eg of metal (in particular chromium) or polymer.
  • a corrosion protection layer eg of metal (in particular chromium) or polymer.
  • the corrosion protection layer may also be referred to as a corrosion inhibiting barrier.
  • the corrosion protection layer may be applied directly or indirectly (eg via at least one intermediate layer) to a base body of the airfoil.
  • the anticorrosion layer may be applied, for example, by electroplating, PVD, CVD, etc.
  • the corrosion protection surface is a surface of a corrosion-resistant body of the airfoil or a surface-passivated surface of a body of the airfoil.
  • a corrosion-protective treatment of the surface of the body of the airfoil can be dispensed with an independent corrosion protection layer.
  • Surface passivation may be e.g. be reacted by nitriding or phosphating, e.g. a body of steel. The nitriding can be carried out, for example, by means of a plasma process.
  • the main body of the airfoil determines a basic shape, size and mechanical and thermal property of the airfoil.
  • the main body may e.g. a cast metal body, in particular of steel, and e.g. also be referred to as "airfoil as such".
  • the main body is in particular a solid body. He may be a filled body or a hollow body.
  • the waterdrop size reducing coating may be applied directly or indirectly (e.g., via at least one intermediate layer) to a corrosion protection surface of the airfoil.
  • a surface of a main body of the airfoil is a smoothed surface.
  • Such a smoothed surface may be beneficial to smoothness of the waterdrop size reducing coating.
  • a vane may e.g. also be formed a blade accordingly.
  • the object is also achieved by a steam turbine having at least one blade, in particular a vane, as described above.
  • the steam turbine is preferably a condensing steam turbine.
  • the at least one blade, in particular guide blade, is located in particular in a low-pressure region of the steam turbine.
  • the object is also achieved by a method for producing a blade, in particular a guide blade, as described above.
  • the method can be made analogous to the vane and gives the same advantages.
  • the method for producing the blade with a water droplet size-reducing coating with at least one organosilicon precursor is used, in which at least one organosilicon precursor is applied to a base body of the blade or to a corrosion protection layer applied to the base body, which follows networked.
  • the base body is already made smoother.
  • improvements in the manufacturing process may include the use of a finer sand in the mold making of a mold of the body and / or a smoother source in welding.
  • the surface of the main body of the airfoil may be polished.
  • a further, alternative or additional, measure consists in applying a topography-leveling coating on the base body.
  • the figure shows a sectional side view of a section of a near-surface region of an airfoil 2 a vane 1 of a steam turbine D.
  • a vane 1 may be used in particular in a low pressure region of the steam turbine D.
  • a base body 3 made of steel of the guide blade 1 is provided. Subsequently, his initially untreated surface 4 is smoothed by polishing.
  • nitriding of the polished surface 4 takes place, e.g. using a plasma.
  • a superficial region 5 of the base body 3 is formed as a layer-like corrosion-inhibiting region.
  • An underlying region 6 is not nitrided.
  • an organosilicon precursor e.g. Hexamethyldisiloxane and / or octamethylcyclosiloxane.
  • a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded.

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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)
EP15184244.0A 2014-09-29 2015-09-08 Aube de turbine dotee de pales revetues d'une couche hydrophobe Not-in-force EP3000977B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014219653.1A DE102014219653A1 (de) 2014-09-29 2014-09-29 Schaufel einer Turbine mit beschichtetem Schaufelblatt

Publications (2)

Publication Number Publication Date
EP3000977A1 true EP3000977A1 (fr) 2016-03-30
EP3000977B1 EP3000977B1 (fr) 2020-11-04

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ID=54065798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15184244.0A Not-in-force EP3000977B1 (fr) 2014-09-29 2015-09-08 Aube de turbine dotee de pales revetues d'une couche hydrophobe

Country Status (2)

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EP (1) EP3000977B1 (fr)
DE (1) DE102014219653A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017222516A1 (fr) * 2016-06-22 2017-12-28 Siemens Aktiengesellschaft Procédé et système permettant de réduire des dommages dus à des impacts de gouttelettes de liquide par des surfaces superhydrophobes
CN110168198A (zh) * 2017-01-09 2019-08-23 康明斯滤清系统知识产权公司 具有用于提高液压效率的非润湿表面的冲击式涡轮机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724626A1 (de) 1986-07-31 1988-02-04 Mitsubishi Heavy Ind Ltd Beschichtete schaufel fuer dampfturbinen und hierfuer anzuwendendes beschichtungsverfahren
DE19607979A1 (de) 1996-03-01 1997-09-04 Asea Brown Boveri Abgastrakt einer insbesondere zur Verbrennung von Schweröl einsetzbaren Verbrennungsvorrichtung
WO1998018977A1 (fr) 1996-10-28 1998-05-07 Abb Patent Gmbh Revetement de composants et son procede de fabrication
DE10056241A1 (de) 2000-11-14 2002-05-23 Alstom Switzerland Ltd Niederdruckdampfturbine
DE69624971T2 (de) 1995-04-25 2003-07-17 Sermatch International Inc., Limerick Fäulnisverhinderndes Überzugsmittel für Turbomaschinen
EP1935509A1 (fr) * 2006-12-19 2008-06-25 General Electric Company Articles dotés de surfaces antisalissure et leurs procédés de fabrication
US20130032316A1 (en) * 2011-08-05 2013-02-07 Rajeev Dhiman Liquid-Impregnated Surfaces, Methods of Making, and Devices Incorporating the Same
US20130032646A1 (en) * 2011-08-03 2013-02-07 Rajeev Dhiman Articles for manipulating impinging liquids and methods of manufacturing same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014145586A1 (fr) * 2013-03-15 2014-09-18 Jonathan David Smith Procédés et articles destinés à des surfaces imprégnées de liquide pour l'inhibition de la nucléation en phase vapeur ou en phase gazeuse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724626A1 (de) 1986-07-31 1988-02-04 Mitsubishi Heavy Ind Ltd Beschichtete schaufel fuer dampfturbinen und hierfuer anzuwendendes beschichtungsverfahren
DE69624971T2 (de) 1995-04-25 2003-07-17 Sermatch International Inc., Limerick Fäulnisverhinderndes Überzugsmittel für Turbomaschinen
DE19607979A1 (de) 1996-03-01 1997-09-04 Asea Brown Boveri Abgastrakt einer insbesondere zur Verbrennung von Schweröl einsetzbaren Verbrennungsvorrichtung
WO1998018977A1 (fr) 1996-10-28 1998-05-07 Abb Patent Gmbh Revetement de composants et son procede de fabrication
DE10056241A1 (de) 2000-11-14 2002-05-23 Alstom Switzerland Ltd Niederdruckdampfturbine
EP1935509A1 (fr) * 2006-12-19 2008-06-25 General Electric Company Articles dotés de surfaces antisalissure et leurs procédés de fabrication
US20130032646A1 (en) * 2011-08-03 2013-02-07 Rajeev Dhiman Articles for manipulating impinging liquids and methods of manufacturing same
US20130032316A1 (en) * 2011-08-05 2013-02-07 Rajeev Dhiman Liquid-Impregnated Surfaces, Methods of Making, and Devices Incorporating the Same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
POZZATO A ET AL: "Superhydrophobic surfaces fabricated by nanoimprint lithography", MICROELECTRONIC ENGINEERING, ELSEVIER PUBLISHERS BV., AMSTERDAM, NL, vol. 83, no. 4-9, 1 April 2006 (2006-04-01), pages 884 - 888, XP024954955, ISSN: 0167-9317, [retrieved on 20060401], DOI: 10.1016/J.MEE.2006.01.012 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017222516A1 (fr) * 2016-06-22 2017-12-28 Siemens Aktiengesellschaft Procédé et système permettant de réduire des dommages dus à des impacts de gouttelettes de liquide par des surfaces superhydrophobes
CN110168198A (zh) * 2017-01-09 2019-08-23 康明斯滤清系统知识产权公司 具有用于提高液压效率的非润湿表面的冲击式涡轮机

Also Published As

Publication number Publication date
EP3000977B1 (fr) 2020-11-04
DE102014219653A1 (de) 2016-03-31

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