GB2424454A - Water extracting turbine stator blade - Google Patents
Water extracting turbine stator blade Download PDFInfo
- Publication number
- GB2424454A GB2424454A GB0505984A GB0505984A GB2424454A GB 2424454 A GB2424454 A GB 2424454A GB 0505984 A GB0505984 A GB 0505984A GB 0505984 A GB0505984 A GB 0505984A GB 2424454 A GB2424454 A GB 2424454A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turbine blade
- aperture
- channel
- solid fixed
- recess
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000009760 electrical discharge machining Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 238000003801 milling Methods 0.000 claims abstract description 7
- 238000005242 forging Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 35
- 238000003809 water extraction Methods 0.000 claims description 28
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000003754 machining Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004326 stimulated echo acquisition mode for imaging Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
-
- 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
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- 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
- F01D5/14—Form or construction
- F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
-
- 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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
-
- 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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
Abstract
A turbine stator blade 1 for a steam turbine comprises at least one channel 14 or recess 8 formed in the blade, and at least one aperture 12 extending between the channel 14 or recess 8 and a surface 6 of the blade 1. The channel 14 may be formed by a plate 10 secured to the blade 1. Water, which is condensed from steam, may be extracted from the stator blade region of the turbine through the aperture(s) 12 and into the channel(s)14 or recess(es) 8. The invention also extends to a method of manufacturing the turbine stator blade 1, wherein the channel(s) 14 or recess(es) 8 may be created by drilling or electrical discharge machining (EDM), the aperture(s) 12 may be created by milling or EDM and the blade 1 may be formed by forging or casting.
Description
FIXED BLADES FOR STEAM TURBINES
Field of the Invention
The present invention relates to blades for steam turbines, and in particular to fixed or stationary blades mounted in the turbine casing for directing inflow of steam onto rotating blades.
Background of the Invention
It is well known that the presence of water droplets in the final stages of a steam turbine causes erosion of the leading edges of the rotating blades. The water droplets condense out of the steam onto the upstream fixed blades and form a water film. This strips off from the trailing edge of the fixed blades in the form of large water droplets, which impact against the rotating blades causing material to erode away.
One solution is to extract the water droplets into a hollow fixed blade through a series of slots machined into the blade profile. The slots are preferably formed as close as possible to the trailing edge of the turbine blade. A number of fixed blades are normally mounted in the turbine casing so that they extend between radially inner and outer rings. The core of the hollow blade is connected to the condenser of the steam turbine through a series of pipes and an annular duct provided in the radially outer ring. Because the condenser is at a lower pressure than the steam flowing over the fixed blade, any water on the surface of the fixed blade is sucked through the slots instead of being stripped away and impacting against the rotating blades.
The hollow blade is often formed by bending and welding a plate into a conventional aerofoil profile. As a result, the manufacture of hollow blades can be more expensive, less accurate and weaker than those made using a casting or forging method, or those made from bar stock.
Summary of the Invention
The present invention seeks to overcome these problems by forming at least one aperture and a water extraction channel in a fixed blade that is cast, forged or made from bar stock and which has a substantially solid cross-section (referred to below as a "solid fixed steam turbine blade") rather than using a hollow blade. Such solid fixed steam turbine blades are stronger than hollow blades and there is a commonality of design with those solid fixed steam turbine blades where water extraction is not required. in other words, a single design of solid fixed steam turbine blade can be provided with or without the ability to extract water from the outer surface of the turbine blade. It is also possible to rely on existing designs for solid fixed steam turbine blades rather than having to design new hollow blades. The solid fixed steam turbine blades are therefore cheaper to made and can be designed faster.
In a first aspect, the invention provides a solid fixed steam turbine blade connectable to a water extraction apparatus, the turbine blade comprising at least one channel formed in the turbine blade and at least one aperture extending between the at least one channel and the outer surface of the turbine blade such that any water on the outer surface of the turbine blade can be extracted through the at least one aperture and the at least one channel by the water extraction apparatus.
A single turbine stage of a steam turbine includes a row of fixed blades and a row of rotating blades. Each row of fixed blades can be formed by a series of circumferentially aligned and spaced apart turbine blades according to the present invention, extending between radially inner and outer rings or end blocks. The turbine blade according to the present invention is particularly suitable for use in the final stage or stages of the steam turbine where water droplet erosion is most problematic.
The channel is formed in the main body of the turbine blade and extends in a direction generally parallel to the leading and/or trailing edges of the turbine blade. The turbine blade preferably includes a plurality of apertures (optionally in the form of a series of thin slots) extending between the outer surface of the turbine blade and the channel. (-)
The apertures may be arranged at different distances from the radially inner and outer rings and/or from the leading and trailing edges of the turbine blade so that a pattern of apertures is formed across the outer surface of the turbine blade. The spread of apertures across the outer surface will depend on the size, shape and depth of the associated channel. Apertures can be formed in one or both of the side faces of the turbine blade.
A plurality of channels can be formed in the turbine blade. Each of the channels is connected to at least one aperture (optionally in the form of a thin slot or a series of thin slots) extending between the outer surface of the turbine blade and the channel.
The plurality of channels may have different cross-sectional areas and/or different lengths. For example, channels formed closer to the trailing edge of the turbine blade may have to be narrower than those formed further away from the trailing edge because of the engineering constraints imposed by the thickness of the turbine blade at that particular region. The cross-sectional area of the aperture or apertures associated with each of the channels may also be different so that the ratio of the channel area to the aperture area (or where each channel has more than one aperture, the total aperture area) remains substantially constant for each of the channels. This ensures that the pressure drop across each of the channels is generally the same so that there is no appreciable difference in the water droplet extraction across the surface of the turbine blade. If the apertures are formed as thin slots then the length of the slot or slots associated with each channel may be different. For example, if a first channel has a narrow cross-sectional area and a second channel has a large cross-sectional area then the slot associated with the first channel should be shorter than the slot associated with the second channel for a given slot width. A typical slot may have a length of about 100 mm and a width of about 1 mm.
In a second aspect, the present invention provides a solid fixed steam turbine blade connectable to a water extraction apparatus, the turbine blade comprising at least one channel defined by a recess formed in the outer surface of the turbine blade and a plate secured to the turbine blade over the recess, and wherein the plate has at least one aperture extending through it such that any water on the outer surface of the turbine blade andlor the outer surface of the plate can be extracted through the at least one aperture and the at least one channel by the water extraction apparatus.
The plate preferably has a plurality of apertures extending through it. The at least one aperture may be in the form of a thin slot.
The recess may be formed in the outer surface of the turbine blade adjacent to the trailing edge of the turbine blade. More than one recess can be provided and in one or both side faces of the turbine blade. Each recess is preferably covered by a separate plate.
The present invention further provides a water extraction apparatus for a steam turbine, the water extraction apparatus comprising a solid fixed steam turbine blade as described above where the channel is connected to a condenser. The channel can be connected to an annular duct formed in the radially outer ring of the turbine blade, and which in turn is connected to the condenser. Because the condenser is at a lower pressure than the steam flowing over the turbine blade, any water that has condensed out of the steam onto the outer surface of the turbine blade is sucked through the at least one aperture and the channel (and optionally the annular duct) to the condenser.
It will be readily appreciated that the use of an annular duct allows the channel or channels of each of the series of circumferentially aligned and spaced apart turbine blades to be connected to a single condenser in a convenient manner.
In a further aspect, the present invention provides a method of forming a solid fixed steam turbine blade connectable to a water extraction apparatus, the method comprising the steps of: forming a channel in the turbine blade; and forming at least one aperture in the turbine blade, the at least one aperture extending between the outer surface of the turbine blade and the channel such that any water on the outer surface of the turbine blade can be extracted through the at least one aperture and the channel by the water extraction apparatus.
CD
The channel and/or the at least one aperture can be formed by drilling, electrical discharge machining (EDM) or milling, for example. EDM is a well known method that uses a wire electrode to produce shaped apertures in a conductive material such as a turbine blade.
Moreover, in the case where the turbine blade is cast from a molten metal, the steps of forming a channel and at least one aperture in the turbine blade may be carried out by: providing a casting mould having a wall and a solid core; locating at least one insert having at least one aperture formed though it inside the casting mould so that the aperture extends between the solid core and the wall of the casting mould; and introducing molten metal into the casting mould.
The molten metal will flow around the solid core (creating the water extraction channel) and will fuse or bond with the at least one insert (creating an aperture that extends between the channel and the outer surface of the turbine blade). The aperture in the insert may be temporarily filled or closed during the casting process to prevent it from being filled by the molten metal. The wall of the casting mould may define the final outer profile of the turbine blade, or the outer profile may be finished by a machining step. The turbine blade can be cast from a suitable steel or a titanium alloy, for example. The at least one insert may also be made of a suitable steel.
Preferably, a plurality of inserts will be located in the casting mould so that the turbine blade has a plurality of apertures extending between the channel and the outer surface of the turbine blade. Two or more solid cores can also be provided in the casting mould if two or more channels are required.
In a further aspect, the present invention provides a method of forming a solid fixed steam turbine blade connectable to a water extraction apparatus, the method comprising the steps of: forming a recess in the outer surface of the turbine blade; securing a plate over the recess to define a channel; and forming at least one aperture through the plate such that any water on the outer surface of the turbine blade and/or the outer surface of the plate can be extracted through the at least one aperture and the channel by the water extraction apparatus.
The recess can be milled in the outer surface of the turbine blade, or formed using any suitable machining method. The at least one aperture can be formed through the plate either before or after it is secured to the turbine blade over the recess. The at least one aperture can be formed by drilling, electrical discharge machining (EDM) or milling,
for example.
The plate can be secured using any suitable welding, brazing or joining technique.
In the case where the desired profile of the turbine blade is created by a final machining step, the plate may be secured to the turbine blade over the recess before the final machining step takes place. The method may therefore include a further step of machining the outer surface of the turbine blade until the desired profile is achieved. Any suitable machining method can be used such as milling, grinding or, in the case where the outer profile is very close to the desired profile, polishing.
Brief Description of the Drawings
Exemplary embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 illustrates Figure 1 is a cross section view through a solid fixed steam turbine blade according to the present invention and formed according a first method; Figure 2 is a side view of the turbine blade of Figure 1; Figure 3 is a cross section view through a solid fixed steam turbine blade according to the present invention and formed according to a second method; Figure 4 is a cross section view through a solid fixed steam turbine blade according to the present invention and formed according to a third method; Figure 5 is a cross section view through a casting mould for forming a solid fixed steam turbine blade according to a fourth method; Figure 6 is a side view of a conventional hollow fixed steam turbine blade; and Figure 7 is a front view of a turbine stage of a steam turbine showing a series of circumferentially aligned and spaced apart hollow fixed steam turbine blades and the annular duct that connects the hollow core to a condenser.
Detailed Description of the Preferred Embodiments
With reference to Figures 6 and 7, a hollow fixed steam turbine blade 100 is formed by bending and welding a plate 102 into a conventional aerofoil profile with a leading edge 104 and a trailing edge 106. A number of thin elongate slots 108 are machined into the blade profile as close as possible to the trailing edge 106 and are in fluid communication with the hollow core 110 of the turbine blade. In use, the hollow core is connected to a condenser (not shown) through a series of pipes and an annular duct 112 provided in the radially outer ring 114 that is used to mount a series of circumferentially aligned and spaced apart turbine blades 100 to the turbine casing.
Because the condenser is at a lower pressure than the steam flowing over the turbine blade 100, any water on the surface of the turbine blade 100 is sucked through the slots 108 instead of being stripped away and impacting against the downstream rotating blades (not shown) of the turbine stage.
With reference to Figures 1 and 2, a solid fixed steam turbine blade I includes a leading edge 2 and a trailing edge 4. The turbine blade I is cast and has a cast outer surface 6. A recess 8 is milled in the outer surface 6. A plate 10 has a number of thin elongate slots 12 formed through it by drilling, electrical discharge machining (EDM) or by using a narrow mill (similar to a circular saw). The plate 10 is welded over the recess 8 to define a water extraction channel 14 that extends part of the way down the side face of the turbine blade 1 from the radially outer face as shown in Figure 2. The outer surface 6 of the turbine blade I is then machined until it has a desired profile 16 that is flush with the outer surface of the plate 10. The turbine blade 1 is mounted to the turbine casing (not shown) of a steam turbine between radially inner and outer rings 18 and 20 (Figure 2). In use, the channel 14 is connected to a condenser (not shown) as described above through an annular duct 22 in the radially outer ring 20.
With reference to Figure 3, a solid fixed steam turbine blade 30 includes a water extraction channel 32 formed by EDM through the main body of the turbine blade from the radially outside face. A number of slots 34 are then formed through the outer surface of the turbine blade 30 by EDM to join up with the channel 32. The channel 32 can be of any suitable shape and the slots 34 can be arranged to define a pattern of slots across the outer surface of the turbine blade 30.
With reference to Figure 4, a solid fixed steam turbine blade 40 includes three separate Water extraction channels 42, 44 and 46 formed by drilling (or alternatively by EDM) from the radially outside face. Each of the channels 42, 44 and 46 is in fluid communication with a thin elongate slot (not shown). To make sure that the ratio of the channel area to slot area is substantially constant for each of the channels, the slot in fluid communication with channel 42 is longer than the slot in fluid communication with channel 44, which in turn is longer than the slot in fluid communication with channel 46. The slots (not shown) are produced by EDM or by a narrow mill. It is generally the case that channels with a larger diameter can be made deeper without the drill wandering or breaking. The channels 42, 44 and 46 can therefore be made to have different lengths. Accordingly, the slot (not shown) associated with each of the channels 42, 44 and 46 can be formed at different distances from the radially outside face of the turbine blade 40. The channels 42, 44 and 46 are connected at their radially outer openings to a recess or manifold 48 (represented in Figure 4 by the dashed line), which in turn can be connected to a condenser (not shown) as described above through an annular duct.
With reference to Figure 5, a casting mould 50 has a wall 52 that contains a space 54 for receiving molten metal and which defines the outer profile of a solid fixed steam turbine blade. A solid core 56 is located in the space 54. A pair of steel inserts 58 are positioned between the wall 52 and the solid core 56. Each of the inserts 58 has a thin elongate slot (not shown) formed through it. Molten metal is poured into the space 54 around the solid core 56. The molten metal fuses or bonds to the inserts 58. The molten metal cools to form a turbine blade having a channel in the space previously occupied by the solid core 56. The inserts 58 form an integral part of the outer surface of the turbine blade and the slots (not shown) are in fluid communication with the channel. The outer profile of the turbine blade can be machined to a desired profile as described above. The advantage of this particular casting process is that the same standard machining operations can be used irrespective of whether or not the solid fixed steam turbine blade includes a water extraction channel and slots, it therefore provides an effective low cost solution.
Moreover, the only change to the basic casing process is the addition of the solid core and the one or more inserts.
The present invention has been described above purely by way of example, and modifications can be made within the scope of the invention as claimed. The invention also consists in any individual features described or implicit herein or shown or implicit in the drawings or any combination of any such features or any generalisation of any such features or combination, which extends to equivalents thereof. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments. Each feature disclosed in the specification, including the claims and drawings, may be replaced by alternative features serving the same, equivalent or similar purposes, unless expressly stated otherwise.
Any discussion of the prior art throughout the specification is not an admission that such prior art is widely known or forms part of the common general knowledge in the
field.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like, are to be construed in an inclusive as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to". C)
Claims (31)
1. A solid fixed steam turbine blade connectable to a water extraction apparatus, the turbine blade comprising at least one channel formed in the turbine blade and at least one aperture extending between the at least one channel and the outer surface of the turbine blade such that any water on the outer surface of the turbine blade can he extracted through the at least one aperture and the at least one channel by the water extraction apparatus.
2. A solid fixed steam turbine blade according to claim I, further comprising a plurality of apertures extending between the outer surface of the turbine blade and the at least one channel.
3. A solid fixed turbine blade according to claim 1 or claim 2, further comprising a plurality of channels formed in the turbine blade and at least one aperture extending between the outer surface of the turbine blade and each of the channels.
4. A solid fixed turbine blade according to claim 3, wherein the channels have different cross-sectional areas.
5. A solid fixed turbine blade according to claim 3 or claim 4, wherein the channels have different lengths.
6. A solid fixed turbine blade according to any preceding claim, wherein the at least one aperture is a thin slot.
7. A solid fixed turbine blade according to any preceding claim, wherein the at least one aperture is formed in the outer surface of the turbine blade adjacent to the trailing edge of the turbine blade.
8. A solid fixed steam turbine blade connectable to a water extraction apparatus, the turbine blade comprising at least one channel defined by a recess formed in the outer surface of the turbine blade and a plate secured to the turbine blade over the recess, and wherein the plate has at least one aperture extending through it such that any water on the outer surface of the turbine blade andlor the outer surface of the plate can be extracted through the at least one aperture and the at least one channel by the water extraction apparatus.
9. A solid fixed steam turbine blade according to claim 8, wherein the plate has a plurality of apertures extending through it.
10. A solid fixed turbine blade according to any preceding claim 8 or claim 9, wherein the at least one aperture is a thin slot.
11. A solid fixed turbine blade according to any preceding claim, wherein the recess is formed in the outer surface of the turbine blade adjacent to the trailing edge of the turbine blade.
12. A water extraction apparatus for a steam turbine, the water extraction apparatus comprising: a solid fixed steam turbine blade according to any preceding claim; and a condenser connected to the channel formed in the turbine blade.
13. A water extraction apparatus according to claim 12, further comprising an annular duct connected between the channel and the condenser.
14. A method of forming a solid fixed steam turbine blade connectable to a water extraction apparatus, the method comprising the steps of: forming a channel in the turbine blade; and forming at least one aperture in the turbine blade, the at least one aperture extending between the outer surface of the turbine blade and the channel such that any water on the outer surface of the turbine blade can be extracted through the at least one aperture and the channel by the water extraction apparatus.
15. A method according to claim 14, wherein the channel is formed by drilling.
- 12 -
16. A method according to claim 14, wherein the channel is formed by electrical discharge machining (EDM).
17. A method according to any of claims 14 to 16, wherein the at least one aperture is formed by drilling.
18. A method according to any of claims 14 to 16, wherein the at least one aperture is formed by electrical discharge machining (EDM).
19. A method according to any of claims 14 to 16, wherein the at least one aperture is formed by milling.
20. A method according to any of claims 14 to 19, wherein the turbine blade is formed by forging.
21. A method according to any of claims 14 to 19, wherein the turbine blade is formed by casting.
22. A method according to any of claims 14 to 19, wherein the turbine blade is cast from molten metal, the method further comprising the steps of: providing a casting mould having a wall and a solid core; locating at least one insert having at least one aperture formed though it inside the casting mould so that the aperture extends between the solid core and the wall of the casting mould; and introducing molten metal into the casting mould.
23. A method of forming a solid fixed steam turbine blade connectable to a water extraction apparatus, the method comprising the steps of: forming a recess in the outer surface of the turbine blade; securing a plate over the recess to define a channel; and - 13 - forming at least one aperture through the plate such that any water on the outer surface of the turbine blade and/or the outer surface of the plate can be extracted through the at least one aperture and the channel by the water extraction apparatus.
24. A method according to claim 23, wherein the recess is formed by milling.
25. A method according to claim 23 or claim 24, wherein the at least one aperture is formed through the plate before it is secured to the turbine blade over the recess.
26. A method according to claim 23 or claim 24, wherein the at least one aperture is formed through the plate after it is secured to the turbine blade over the recess.
27. A method according to any of claims 23 to 25, wherein the at least one aperture is formed by drilling.
28. A method according to any of claims 23 to 25, wherein the at least one aperture is formed by electrical discharge machining (EDM).
29. A method according to any of claims 23 to 25, wherein the at least one aperture is formed by milling.
30. A method according to any of claim 23 to 29, further comprising the step of machining the outer surface of the turbine blade to a desired profile after the plate has been secured to the turbine blade over the recess.
31. A solid fixed steam turbine blade substantially as described herein and with reference to Figures 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0505984A GB2424454A (en) | 2005-03-24 | 2005-03-24 | Water extracting turbine stator blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0505984A GB2424454A (en) | 2005-03-24 | 2005-03-24 | Water extracting turbine stator blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0505984D0 GB0505984D0 (en) | 2005-04-27 |
| GB2424454A true GB2424454A (en) | 2006-09-27 |
Family
ID=34531750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0505984A Withdrawn GB2424454A (en) | 2005-03-24 | 2005-03-24 | Water extracting turbine stator blade |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2424454A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628929A (en) * | 2012-07-30 | 2014-03-12 | 株式会社日立制作所 | Steam turbine, and steam turbine stationary blade |
| EP2985426A1 (en) * | 2014-08-12 | 2016-02-17 | Siemens Aktiengesellschaft | Blade device for a turbine and corresponding manufacturing method |
| US9291062B2 (en) | 2012-09-07 | 2016-03-22 | General Electric Company | Methods of forming blades and method for rendering a blade resistant to erosion |
| KR20160074553A (en) * | 2013-10-23 | 2016-06-28 | 누보 피그노네 에스알엘 | Method for manufacturing a stage of a steam turbine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB316381A (en) * | 1928-06-11 | 1929-08-01 | Karl Baumann | Improvements relating to elastic fluid turbines |
| GB760734A (en) * | 1954-03-12 | 1956-11-07 | English Electric Co Ltd | Improvements in and relating to steam turbines |
| JPS58176404A (en) * | 1982-04-08 | 1983-10-15 | Mitsubishi Heavy Ind Ltd | Drain removing device |
| JPS63117104A (en) * | 1986-11-05 | 1988-05-21 | Toshiba Corp | Moisture separating device for steam turbine |
| US4938785A (en) * | 1988-07-22 | 1990-07-03 | Pai Corporation | Gas-liquid separation |
| EP0726384A1 (en) * | 1995-02-13 | 1996-08-14 | Abb Research Ltd. | Stator blade for steam turbines |
| DE19755982A1 (en) * | 1997-12-17 | 1999-07-08 | Abb Patent Gmbh | Steam turbine with wet steam regime |
| JPH11210404A (en) * | 1998-01-28 | 1999-08-03 | Juki Aizu Precision Kk | Nozzle blade with drain hole and its manufacture |
-
2005
- 2005-03-24 GB GB0505984A patent/GB2424454A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB316381A (en) * | 1928-06-11 | 1929-08-01 | Karl Baumann | Improvements relating to elastic fluid turbines |
| GB760734A (en) * | 1954-03-12 | 1956-11-07 | English Electric Co Ltd | Improvements in and relating to steam turbines |
| JPS58176404A (en) * | 1982-04-08 | 1983-10-15 | Mitsubishi Heavy Ind Ltd | Drain removing device |
| JPS63117104A (en) * | 1986-11-05 | 1988-05-21 | Toshiba Corp | Moisture separating device for steam turbine |
| US4938785A (en) * | 1988-07-22 | 1990-07-03 | Pai Corporation | Gas-liquid separation |
| EP0726384A1 (en) * | 1995-02-13 | 1996-08-14 | Abb Research Ltd. | Stator blade for steam turbines |
| DE19755982A1 (en) * | 1997-12-17 | 1999-07-08 | Abb Patent Gmbh | Steam turbine with wet steam regime |
| JPH11210404A (en) * | 1998-01-28 | 1999-08-03 | Juki Aizu Precision Kk | Nozzle blade with drain hole and its manufacture |
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| CN103628929A (en) * | 2012-07-30 | 2014-03-12 | 株式会社日立制作所 | Steam turbine, and steam turbine stationary blade |
| CN103628929B (en) * | 2012-07-30 | 2016-01-13 | 三菱日立电力系统株式会社 | The quiet wing of steam turbine and steam turbine |
| US9291062B2 (en) | 2012-09-07 | 2016-03-22 | General Electric Company | Methods of forming blades and method for rendering a blade resistant to erosion |
| KR20160074553A (en) * | 2013-10-23 | 2016-06-28 | 누보 피그노네 에스알엘 | Method for manufacturing a stage of a steam turbine |
| JP2017502188A (en) * | 2013-10-23 | 2017-01-19 | ヌオーヴォ ピニォーネ ソチエタ レスポンサビリタ リミタータＮｕｏｖｏ Ｐｉｇｎｏｎｅ Ｓ．Ｒ．Ｌ． | Method for manufacturing a steam turbine stage |
| KR102250459B1 (en) * | 2013-10-23 | 2021-05-13 | 누보 피그노네 에스알엘 | Method for manufacturing a stage of a steam turbine |
| US11333029B2 (en) | 2013-10-23 | 2022-05-17 | Nuovo Pignone Srl | Method for manufacturing a stage of a steam turbine |
| EP2985426A1 (en) * | 2014-08-12 | 2016-02-17 | Siemens Aktiengesellschaft | Blade device for a turbine and corresponding manufacturing method |
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| GB0505984D0 (en) | 2005-04-27 |
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