EP0392664A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cooled turbine blade and combined cycle power plant having gas turbine with this cooled turbine blade
Assignee: Toshiba Corp
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Filing: 1990-03-13
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Granted: —
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Expires: 2010-03-13
Abstract
Abstract A blade includes a blade body (1) having a cavity (5a, 5b), an insert (6, 7) inserted in the cavity (5a, 5b), a plurality of impingement holes (8, 9) formed in a circumferential wall of the insert (6, 7), and a recovery path (12, 14) for recovering a cooling medium sprayed from the impingement holes (8, 9). The cooling medium can be recovered without being discharged into a main gas. A gas turbine (101) having this blade is used for a combined cycle power plant. In this plant, steam is supplied as a cooling medium to the blade, and the steam recovered from the blade is supplied to a steam turbine (103).
Inventors
- 👤 Fumio C/O Intellectual Property Division Ohtomo
- 👤 Tatsuo C/O Intellectual Property Division Araki
- 👤 Asako C/O Intellectual Property Div. Matsuura
- 👤 Yoshiaki C/O Intellectual Property Div. Tsukumo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 09:37
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/188; F01D5/189; F02; F02C; F02C7/00; F02C7/12; F02C7/16; F05; F05D; F05D2240/00; F05D2240/80; F05D2240/81; F05D2260/00; F05D2260/20; F05D2260/201; F05D2260/232; F05D2260/2322
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
159 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in a direction of span; a hollow insert (6, 7) mounted in said cavity (5a, 5b), opposing an outer surface of a circumferential wall of said insert (6, 7) and an inner wall surface of said blade body (1) to form a gap therebetween, said circumferential wall of said insert (6, 7) being provided with a plurality of impingement holes (8, 9), and the cooling medium being sprayed from said impingement holes (8, 9) to said inner wall surface of said blade body (1); and a recovery path (12, 14) formed in said blade body (1), the cooling medium sprayed from said impingement holes (8, 9) cooling a wall of said blade body (1) and flowing in said recovery path (12, 14) and being recovered from said blade body (1) through said recovery path (12, 14).
Claim 2
Dependent Claim
159 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in a direction of span; a hollow insert (6, 7) mounted in said cavity (5a, 5b), opposing an outer surface of a circumferential wall of said insert (6, 7) and an inner wall surface of said blade body (1) to form a gap therebetween, said circumferential wall of said insert (6, 7) being provided with a plurality of impingement holes (8, 9), and the cooling medium being sprayed from said impingement holes (8, 9) to said inner wall surface of said blade body (1); and a recovery path (12, 14) formed in said blade body (1), the cooling medium sprayed from said impingement holes (8, 9) cooling a wall of said blade body (1) and flowing in said recovery path (12, 14) and being recovered from said blade body (1) through said recovery path (12, 14).
Claim 3
Dependent Claim
64 words
A blade according to claim 1, characterized in that said cavity comprises at least a fore cavity (5a) formed in a front portion of said blade body (1) and an aft cavity (5b) formed in a rear portion of said blade body (1), and a fore insert (6) and an aft insert (7) are respectively mounted in said fore and aft cavities (5a, 5b).
Claim 4
Dependent Claim
65 words
A blade according to claim 1, characterized in that said recovery path (12, 14) is arranged adjacent to said insert (6, 7) in a direction of chord, and the cooling medium sprayed from said impingement holes (8, 9) of said insert (6, 7) cools the wall of said blade body (1), flows in the direction of chord, and flows in said recovery path (12, 14).
Claim 5
Dependent Claim
91 words
A blade according to claim 1, characterized in that an end portion of said cavity (5a, 5b) communicates with a recovery port (20), a space between said outer surface of said circumferential wall of said insert (6, 7) and an inner wall surface of said blade body (1) is formed as said recovery path, and the cooling medium sprayed from said impingement holes (8, 9) cools said wall of said blade body (1), flows in said recovery path in the direction of span, and is recovered from said recovery port (20).
Claim 6
Dependent Claim
32 words
A blade according to claim 2, characterized by further comprising a communication path (40) through which the cooling medium sprayed from said fore insert (6) is supplied to said aft insert (7).
Claim 7
Dependent Claim
32 words
A blade according to claim 2, characterized by further comprising a communication path (40) through which the cooling medium sprayed from said aft insert (7) is supplied to said fore insert (6).
Claim 8
Dependent Claim
49 words
A blade according to claim 5, characterized in that an auxiliary supply port (50) is formed to communicate with said communication path (40), and a flow of the cooling medium supplied to said aft insert (7) is added with a new cooling medium through said auxiliary supply port (50).
Claim 9
Dependent Claim
49 words
A blade according to claim 6, characterized in that an auxiliary supply port (50) is formed to communicate with said communication path (40), and a flow of the cooling medium supplied to said fore insert (6) is added with a new cooling medium through said auxiliary supply port (50).
Claim 10
Dependent Claim
37 words
A blade according to claim 2, characterized in that the cooling medium sprayed from said fore insert (6) and the new cooling medium sprayed from said aft insert (7) are recovered through a common recovery port (20).
Claim 11
Dependent Claim
20 words
A blade according to claim 1, characterized in that the cooling medium supplied to said insert (6, 7) is steam.
Claim 12
Dependent Claim
62 words
A blade according to claim 1, characterized in that a trailing edge cooling path (23) is formed in a trailing edge portion of said blade body (1), and the cooling medium is supplied to said trailing edge cooling path (23), cools said trailing edge portion, and is discharged from said tailing edge portion of said blade body (1) in a main gas.
Claim 13
Dependent Claim
80 words
A blade according to claim 11, characterized in that a plurality of convex turbulence promoters (63, 64) are formed on an inner surface of a wall which surrounds said trailing edge cooling path (23), said turbulence promoters (63, 64) extending in a direction perpendicular to a flow direction of the cooling medium in said trailing edge cooling path (23), and said turbulence promoters (63, 64) causing the flow in said trailing edge cooling path (23) to form a turbulent flow.
Claim 14
Dependent Claim
22 words
A blade according to claim 11, characterized in that the cooling medium supplied to said trailing edge cooling path (23) is air.
Claim 15
Dependent Claim
87 words
A blade according to claim 1, characterized in that film cooling holes (41, 42, 43, 81, 82, 83) which communicate with said cavity (5a, 5b) and open to said outer wall surface of said blade body (1) are formed in said wall of said blade body (1), and part of the cooling medium sprayed from said insert is sprayed from said film cooling holes (41, 42, 43, 81, 82, 83) and is formed as a film-like flow along said outer wall surface of said blade body (1).
Claim 16
Dependent Claim
144 words
A blade according to claim 3, characterized in that film cooling holes (41, 42, 43) which communicate with said cavity (5a, 5b) and open to said outer wall surface of said blade body (1) are formed in said wall of said blade body (1) and part of the cooling medium sprayed from said insert (6, 7) flows as a film-like flow along said outer wall surface of said blade body (1); and baffles (44, 45, 46) are arranged between said outer circumferential surface of said wall of said insert (6, 7) and said inner wall surface of said blade body (1) in the direction of chord, and a flow of the cooling medium in the direction of span is regulated by said baffles (44, 45, 46), thereby controlling a flow rate of the cooling medium sprayed from said film cooling holes (41, 42, 43).
Claim 17
Dependent Claim
149 words
A blade according to claim 4, characterized in that a plurality of ribs (60, 61) extend on said inner wall surface of said blade body (1) which surrounds said cavity (5a, 5b) and divide said recovery path into a plurality of flow channels, film cooling holes (81, 82, 83) which communicate with at least one of said flow channels and open to said outer wall surface of said blade body (1) are formed in said wall of said blade body (1), said at least flow channel which communicates with said film cooling holes (81, 82, 83) being formed not to communicate with said recovery port (20), and the cooling medium sprayed from said insert (6, 7) into said at least one flow channel is sprayed from said film cooling holes (81, 82, 83) and flows as a film-like flow along said outer wall surface of said blade body (1).
Claim 18
Dependent Claim
23 words
A blade according to claim 1, characterized in that shrouds (2, 3) are respectively formed at both tips of said blade body (1).
Claim 19
Dependent Claim
32 words
A blade according to claim 17, characterized in that cooling paths (2a, 3a) are respectively formed in said shrouds (2, 3) and receive the cooling medium, thereby cooling said shrouds (2, 3).
Claim 20
Dependent Claim
30 words
The blade according to claim 17, characterized in that the cooling medium recovered in said recovery path (12, 14) is supplied to said cooling path of said shrouds (2, 3).
Claim 21
Dependent Claim
40 words
The blade according to claim 17, characterized in that an auxiliary supply port (50) communicating with said cooling path of said shrouds (2, 3), and new cooling medium is added to the cooling path through the auxiliary supply port (50).
Claim 22
Dependent Claim
42 words
The blade according to claim 5, characterized in that an orifice hole is formed in the vicinity of the downstream portion of said fore insert (6), for ejecting the cooling medium, thereby to supply the cooling medium to said aft insert (7).
Claim 23
Dependent Claim
42 words
The blade according to claim 6, characterized in that an orifice hole is formed in the vicinity of the downstream portion of said fore insert (6), for ejecting the cooling medium, thereby to supply the cooling medium to said aft insert (7).
Claim 24
Dependent Claim
23 words
The blade according to claim 8, characterized in that a nozzle is formed in the front end of said auxiliary supply port (50).
Claim 25
Dependent Claim
33 words
The blade according to claim 21, characterized in that the new cooling medium to be ejected from said nozzle is either a cooling liquid or moist steam, and is sprayed from said nozzle.
Claim 26
Dependent Claim
38 words
The blade according to claim 22, characterized in that the new cooling medium to be ejected from said nozzle is either a cooling liquid or moist steam, and is sprayed from said nozzle in the form of spray.
Claim 27
Dependent Claim
36 words
The blade according to claim 1, characterized in that the cooling medium which has passed through the recovery path (12, 14) and thus recovered from said blade body (1) is returned to a cooling medium source.
Claim 28
Dependent Claim
165 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in the lengthwise direction of the blade body (1); a hollow insert (6, 7) mounted in said cavity (5a, 5b), opposing an outer surface of a circumferential wall of said insert (6, 7) and an inner wall surface of said blade body (1) to form a gap therebetween, said circumferential wall of said insert (6, 7) being provided with a plurality of impingement holes (8, 9), and the cooling medium being sprayed from said impingement holes (8, 9) to said inner wall surface of said blade body (1); and a guide path formed in said blade body (1) and extending in the lengthwise direction of said blade body (1), the cooling medium sprayed from said impingement holes (8, 9) cooling a wall of said blade body (1) and flowing through said guide path after cooling the walls of said blade body (1).
Claim 29
Dependent Claim
165 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in the lengthwise direction of the blade body (1); a hollow insert (6, 7) mounted in said cavity (5a, 5b), opposing an outer surface of a circumferential wall of said insert (6, 7) and an inner wall surface of said blade body (1) to form a gap therebetween, said circumferential wall of said insert (6, 7) being provided with a plurality of impingement holes (8, 9), and the cooling medium being sprayed from said impingement holes (8, 9) to said inner wall surface of said blade body (1); and a guide path formed in said blade body (1) and extending in the lengthwise direction of said blade body (1), the cooling medium sprayed from said impingement holes (8, 9) cooling a wall of said blade body (1) and flowing through said guide path after cooling the walls of said blade body (1).
Claim 30
Dependent Claim
25 words
The blade according to claim 27, characterized in that the cooling medium is recovered from said blade body (1) after flowing through said guide path.
Claim 31
Dependent Claim
187 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in the lengthwise direction of the blade body (1); a cooling path (23) formed in said blade body (1) for guiding the cooling medium to a rear edge of said blade body (1) in the lengthwise direction of said blade body (1); a thin hole (24) for discharging the cooling medium flowing through said cooling path (23), from a read edge of said blade body (1) in the widthwise direction of said blade body (1); a first turbulence promoter (63) located in that portion of said cooling path (23) where the cooling medium flows in great quantities in the lengthwise direction of said blade body (1), and having walls projecting in the widthwise direction of said blade body (1); and a second turbulence promoter (64) located in that portion of said cooling path (23) where the cooling medium flows in great quantities in the widthwise direction of said blade body (1), and having walls projecting in the lengthwise direction of said blade body (1).
Claim 32
Dependent Claim
187 words
A cooled turbine blade through which a cooling medium passes, characterized by comprising: a blade body (1) having a cavity (5a, 5b) extending in the lengthwise direction of the blade body (1); a cooling path (23) formed in said blade body (1) for guiding the cooling medium to a rear edge of said blade body (1) in the lengthwise direction of said blade body (1); a thin hole (24) for discharging the cooling medium flowing through said cooling path (23), from a read edge of said blade body (1) in the widthwise direction of said blade body (1); a first turbulence promoter (63) located in that portion of said cooling path (23) where the cooling medium flows in great quantities in the lengthwise direction of said blade body (1), and having walls projecting in the widthwise direction of said blade body (1); and a second turbulence promoter (64) located in that portion of said cooling path (23) where the cooling medium flows in great quantities in the widthwise direction of said blade body (1), and having walls projecting in the lengthwise direction of said blade body (1).
Claim 33
Dependent Claim
123 words
A combined cycle power plant comprising a gas turbine, a discharge heat recovery boiler for generating steam by discharge of said gas turbine, a steam turbine driven by the steam from said boiler, and a generator driven by said gas turbine and said steam turbine, characterized in that said gas turbine (101) comprises a cooled turbine blade (1) which receives the steam and is cooled thereby, the steam which cooled said blade (1) being recovered from said blade (1), and characterized by further comprising: means (131) for supplying part of the steam generated by said boiler (107) to said blade (1) of said gas turbine (101); and means (132) for supplying the steam recovered from said blade (1) to said steam turbine (103).
Claim 34
Dependent Claim
123 words
A combined cycle power plant comprising a gas turbine, a discharge heat recovery boiler for generating steam by discharge of said gas turbine, a steam turbine driven by the steam from said boiler, and a generator driven by said gas turbine and said steam turbine, characterized in that said gas turbine (101) comprises a cooled turbine blade (1) which receives the steam and is cooled thereby, the steam which cooled said blade (1) being recovered from said blade (1), and characterized by further comprising: means (131) for supplying part of the steam generated by said boiler (107) to said blade (1) of said gas turbine (101); and means (132) for supplying the steam recovered from said blade (1) to said steam turbine (103).
Claim 35
Dependent Claim
33 words
A plant according to claim 30, characterized in that said means (131) for supplying the steam to said blade (1) supplies the steam bled from said steam turbine (103) to said blade (1).
References Cited (Backward Citations)
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