JP4176273B2 - Gas turbine steam cooling vane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas turbine steam-cooled stationary blade, which employs a steam cooling method to cool the stationary blade, reduce steam pressure loss, and enhance the cooling effect.
[0002]
[Prior art]
A conventional method of cooling a stationary blade of a gas turbine with air has been generally used, and an outline thereof will be described with reference to FIG. FIG. 5 is a cross-sectional view showing a typical one-stage stationary blade of a gas turbine. In the figure, reference numeral 70 denotes a single stage stationary blade, 60 is an outer shroud, and 61 is an inner shroud. Reference numeral 70a denotes a front edge portion of the stationary blade, 70b denotes a rear edge portion, and 70c, 70d, and 70e denote air cooling holes provided in the blade center portion and the rear edge, respectively. Inside the stationary blade 70, a passage 62 on the front edge side, a passage 63 in the center portion, and a passage 68 on the rear edge portion are provided. An insert 64 is inserted into the passage 62, and an insert 65 is inserted into the passage 63. Has been. These inserts 64 and 65 are inserted into the inner walls of the passages 62 and 63 with a predetermined gap, and are supported at multiple points. The inserts 64 and 65 are hollow cylindrical bodies, and a large number of air blowing holes 66 and 67 are opened around the inserts 64 and 65, respectively.
[0003]
In the single-stage vane described above, the cooling air 80, 81, 82 passes through the outer shroud 60 from the cabin space (not shown) and is guided into the vane 70, but the cooling air 80 flows into the insert 64 on the leading edge side. The air flows from the air blowing hole 66 around the insert 64 into the gap formed by the passage 62 and the insert 64, impinges the periphery of the cooling hole 70a and the passage 62, and then the blade from the cooling hole 70c formed in the blade. It flows out to the surface, and the wing surface is cooled by the shower head and the film.
[0004]
Similarly, the cooling air 81 also flows into the insert 65, flows out from the air blowing hole 67 of the insert 65 into the gap formed by the insert 65 and the passage 63, impinges the periphery of the passage 63, and is similarly provided on the blade. The film flows out of the film cooling hole 70d to the blade surface and cools the blade surface. Further, the cooling air 82 enters the rear edge passage 68, cools the rear wing portion, and flows out from the film cooling hole 70e on the rear edge.
[0005]
The single-stage stationary blades described above are air-cooled, but with the recent increase in gas turbine temperatures, particularly in combined cycle power plants, steam is partially extracted from the steam turbine bottoming system and guided to the stationary blades. A cooling system has been developed and is beginning to be applied to actual machines. Also in this steam cooling method, a passage similar to the air cooling method or a serpentine cooling passage is provided in the stationary blade, steam flows in, flows through the cooling passage, collects the cooled steam, and returns to the steam supply side I am doing so.
[0006]
[Problems to be solved by the invention]
As mentioned above, the cooling system for gas turbines is beginning to adopt a system that guides and cools steam instead of air, but, like the air cooling system, a serpentine system passage is provided to cool the stationary blades. The steam pressure loss is large, and in the steam cooling system, a cycle is formed in which the steam after cooling is collected and returned to the steam supply side for effective use, and it is necessary to reduce the pressure loss.
[0007]
In addition, the trailing edge of the stationary blade is not cooled by steam due to its thin shape, and the trailing edge is air-cooled, making the cooling system complicated by two systems, and there is room to consider some measures in terms of performance. was there.
[0008]
Therefore, the present invention forms a narrow steam passage in the stationary blade not only at the leading edge but also at the trailing edge, effectively cooling the entire blade with steam, reducing steam pressure loss, and recovering steam. An object of the present invention is to provide a gas turbine steam-cooled stationary blade that can be used.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides the following means (1) to (7).
[0010]
(1) A wing front half, a wing trailing edge front, and a wing trailing edge, each of which is divided into ribs at the front half and the blade trailing edge, and each of the passages penetrates from the outer shroud to the inner shroud. In the wing trailing edge front part, a plurality of gap passages are formed by dividing the front and rear by ribs and maintaining a predetermined gap on the blade back side and the blade belly side penetrating from the outer shroud to the inner shroud, The outer steam supply cavity is communicated with the passage at the front half of the blade and the gap passage at the front portion of the blade trailing edge, and the inner steam cavity is communicated with the passage at the front half of the blade and the passage at the rear edge of the blade. Each passage in the front half of the blade is divided into a blade back side and a blade belly side, and a predetermined gap is provided between the periphery of the passage and the rib wall surface. A pair of cylindrical inserts inserted to form; and A spacer inserted between a pair of cylindrical inserts to support and fix the inserts; and a plurality of through holes are arranged in the ribs of the front half of the blade that divides the passages; And the gap communicates with the inside of the cylindrical insert at the rearmost part; excluding the tail passage at the front half of the blade from the outer steam supply cavity, the steam flows through the cylindrical insert, and the inner steam From the cavities into the passage at the trailing edge of the blade and out to the outside, and steam is also flowed into the gap in the front half of the blade and mixed into the cylindrical insert at the rearmost portion through the hole in the rib A gas turbine steam-cooled stationary blade, characterized in that:
[0011]
(2) The clearance passage at the front portion of the blade trailing edge is configured to allow a part of the steam to flow out from the rear clearance passage to the outer shroud and to allow the remaining steam to flow into the foremost passage of the blade trailing edge portion. The gas turbine steam-cooled stationary blade according to (1), wherein
[0012]
(3) The pair of cylindrical inserts in each passage of the first half of the blade is configured such that side surfaces facing each other are constituted by a partition plate, and are connected to the partition plate to form a cylindrical hollow portion. The gas turbine steam-cooled stationary blade according to (1), wherein the spacer is supported by the spacer.
[0013]
(4) The gas turbine steam cooling static air as set forth in (3), wherein a plurality of through holes are arranged in each of the opposing partition plates of the foremost passage and the rearmost passage in the front half of the blade. Wings.
[0014]
(5) The spacer is a rod having a circular cross section, and two spacers are inserted into each passage from the outer shroud toward the inner shroud to support the partition plate. Gas turbine steam cooled stationary blade.
[0015]
(6) The gas turbine steam-cooled stationary blade according to (1), wherein the spacer is made of an elastic member.
[0016]
(7) Steam outflow holes are respectively provided in front of the pair of cylindrical inserts on the leading edge side of the front half of the blade, and the inside of the cylindrical insert communicates with the gap to flow out from the cylindrical insert. The gas turbine steam-cooled stationary blade according to (1), wherein steam is allowed to flow into the gap from the hole.
[0017]
The gas turbine steam-cooled stationary blade of the present invention is based on the invention of (1). Steam flows from the outer steam supply cavities into the cylindrical inserts in the passages of the front half of the blades, flows through the respective cylindrical inserts, cools the front half of the blades from the inside, and flows out into the inner steam cavities. Part of the steam in the inner steam cavity flows through the cylindrical insert in the last passage in the front half of the wing and out of the outer shroud, and the rest flows into the rear edge and flows through the passage in the rear edge. Spill into the outer shroud. On the other hand, the steam that has flowed into the cylindrical insert in the front half of the blade flows into the gap because the tip and the cylindrical insert communicate with each other, and from the front edge side of the front half of the blade toward the rear, It flows through the gap on the side, sequentially flows into the gap on both sides of the next passage through the hole in the rib, and enters the steam in the cylindrical insert from the gap on both sides of the rearmost passage in the front half of the blade. Also, the steam flows from the outer steam supply cavity into the clearance passage at the front part of the blade trailing edge, flows in the clearance passages on both sides, merges inside, passes through the clearance passage at the rearmost part of the blade trailing edge, and goes outside. Spill to shroud.
[0018]
As described above, in (1) of the present invention, the narrow steam passage by the pair of cylindrical inserts in the front half of the blade, the gap between each cylindrical insert and the passage and the rib wall, both sides of the front portion of the blade trailing edge A narrow steam flow path is formed by the narrow gap passage, and effective cooling is possible with a small amount of steam, and steam is recovered from the outer shroud and returned to the steam supply source, so that steam pressure loss is reduced. Further, since the trailing edge side is also cooled with steam, conventional air is not required, and the cooling system is simplified.
[0019]
In (2) of the present invention, a portion of the steam that has cooled the blade trailing edge front part flows into the foremost stage passage of the blade trailing edge part, so that cooling of the blade trailing edge part in (1) is enhanced. Further, in the invention of (3), the cylindrical inserts on both sides face each other and form a hollow cylindrical shape with the partition plates, and the space between the partition plates on both sides is supported by a spacer and fixed. The support and fixing of each cylindrical insert on the ventral side are ensured. Further, in (5), the spacer is a round bar, and in (6), it is an elastic material. Since the same effect can be obtained, design options are widened.
[0020]
Further, in the invention of (4), a plurality of holes are arranged vertically on the front and rear partition plates of the front half of the wing of the invention of (3), and the cylindrical inserts on both sides are arranged by these holes. The steam that flows from the inner shroud to the entire outer shroud communicates with each other, and the inflowing steam at the forefront and the outflowing steam at the end are made uniform by the stirring action, thereby enabling uniform cooling.
[0021]
In (7) of the present invention, the steam from the foremost cylindrical insert in the front half of the blade flows into the gap through the hole, so that the steam in the foremost cylindrical insert easily flows into the gap, Steam flow is smooth.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a gas turbine steam-cooled stationary blade according to an embodiment of the present invention, and shows an example of a single-stage stationary blade. In the figure, the outer shroud 50, the inner shroud 51, and the stationary blade 1 constitute the entire blade, steam is supplied from the inner shroud 50, the inside is cooled, and the cooled steam is recovered from the outer shroud 50 again.
[0023]
In FIG. 1, passages 30A, 30B, 30C, and 30D are provided in the stationary blade 1 between the outer shroud 50 and the inner shroud 51, respectively, from the leading edge side to constitute the blade front half, and the trailing edge side from the passage 30D. As will be described later, a blade trailing edge front portion having gaps 31E, 31F, and 31G serving as steam passages is formed, and a plurality of trailing edge passages 30E on the trailing edge side are provided. The passage 30A has spacers 20 and 21 for supporting cylindrical inserts that are divided into a back side and an abdomen side of a wing through a partition plate described later, spacers 22 and 23 are provided in the passage 30B, and spacers 22 and 23 are provided in the passage 30C. 24 and 25, and spacers 26 and 27 are also provided in the passage 30D.
[0024]
In the stationary blade, 2 is a steam inlet and guides steam from the outside of the outer shroud 50. 3 is a steam reservoir (outside steam supply cavity), 4 is an impingement plate for allowing the steam to uniformly flow into the leading edge passage, and 5 is a partition plate that divides the leading edge passage 30A into a back side and a ventral side, The partition plate 5 is provided with a plurality of holes 6 that communicate the back side and the abdomen side vertically from the inside to the outside. Reference numeral 7 denotes an impingement plate that uniformly causes steam to flow from the inner shroud 51 into the passage 30A at the leading edge. Reference numeral 8 denotes a turbulator, which is provided on the inner wall of the front edge passage 30A and stirs the flow to improve the cooling effect.
[0025]
Reference numeral 10 denotes a large number of holes provided on the upper and lower sides of the ribs that partition the passages 30A and 30B, and constitutes a passage that guides the vapor from the gap around the passage 30A to the gap 30B. Reference numeral 11 denotes a hole, which is provided on a rib that separates the passages 30B and 30C, and simultaneously guides steam from the gap of the passage 30B to the gap of 30C. Reference numeral 12 denotes a similar hole, which is provided on a rib that separates the passage 30C and the passage 30D, and guides the steam from the passage 30C to the gap of 30D. Reference numeral 13 denotes a large number of holes provided in a partition plate that partitions the passage 30D into the back side and the abdomen side, and communicates the passages partitioned on both sides with a cylindrical insert.
[0026]
Reference numeral 14 denotes a steam outlet, which flows through the passages 30A, 30B, and 30C on the leading edge side, and recovers the cooled steam that has flowed into 30D to the outer shroud. 15 is also a steam outlet, and collects the cooled steam that has passed through the gaps 31E, 31F, 31G on the trailing edge side and the trailing edge passage 30E to the outer shroud side. Reference numeral 16 denotes a cavity on the inner shroud 51 side, which serves as a steam reservoir for distributing the steam flowing out from the passage 30B to other passages. Reference numeral 17 denotes an impingement plate which uniformly distributes and flows steam from the cavity 16 of the inner shroud 51 into a large number of trailing edge passages 30E. Reference numeral 18 also denotes an impingement plate that uniformly causes steam to flow from the steam reservoir 3 of the outer shroud 50 into the gaps 31E and 31F.
[0027]
In the stationary blade having the above configuration, the cooling steam 40 a flows from the steam inlet 2 and enters the steam reservoir 3. From the steam reservoir 3, it flows through the impingement plate 4 and is uniformly distributed from the outside into the passage 30A, and also flows into the passages 30B and 30C and the gaps 31E and 31F on the trailing edge side.
[0028]
The steam that has flowed into the passage 30A is communicated to both sides through a plurality of holes 6 in which both passages divided by the partition plate 5 and the cylindrical insert are arranged on the back side and the abdomen side, and the flow is stirred. As will be described later, the air flows into the gap 31A on both sides formed around the passage 30A, cools the front edge, and flows to the gap 31B in the rear passage 30B adjacent to the hole 10 like 40b.
[0029]
In the passage 30B, the steam flowing in through the hole 10 like the gaps 31A to 40b of the passage 30A passes through the gaps 31B on the back side and the abdominal side of the passage, cools both sides of the passage, and passes through the gap 31B after cooling. The steam flows through the hole 11 as shown by 40C into the gap 31C of the adjacent rear passage 30C, and similarly cools both the back side and the ventral side of the passage 30C, and passes through the hole 12 as shown by 40d. , Flows into the gap 31D of the adjacent rear passage 30D.
[0030]
The steam that flows into the gaps 31D on both sides of the passage 30D cools both sides through the gaps 31D as will be described later with reference to FIG. 2, and then enters the cylindrical insert of the passage 30D to partition the back side and the stomach side. A large number of upper and lower holes 13 provided in 5D-1 flow through the passages on both sides, mix with the steam flowing in from the inner shroud 51, and flow out from the steam outlet 14 of the outer shroud 50 for recovery. Is done.
[0031]
On the other hand, the steam 40e flowing into the cylindrical insert in the passage 30B flows from the outside into the cavity 16 in the inner shroud 51 while cooling the passage 30B, and also flows into the cylindrical insert in the passage 30C. The steam 40f also flows from the outside to the inside shroud and cools out to the cavity 16 while cooling the passage 30C. Out of the steam that flows out into the cavity 16 and accumulates here, 40 g flows into the passage 30A at the leading edge from the impingement plate 7, and in the passage 30A, the steam that flows from the outer shroud and the steam that flows from the inner shroud mix, The leading edge side passage 30A is effectively cooled, flows into the gaps 30A on both sides as described above, and flows into the adjacent passage 30B as shown by a large number of holes 10 to 40b.
[0032]
40h of the steam in the cavity 16 flows into the passage 30D, mixes with the steam that flows into the gap 31D as in the passages 30C to 40d and enters the passage 30D, and effectively cools the passage 30D, thereby cooling the outer shroud. From the steam outlet 14 and collected. Further, the vapor 40i in the cavity 16 flows to the trailing edge side and is uniformly distributed to the rearmost passage of the trailing edge passage 30E as indicated by 40j and to the remaining many passages such as 40k through the impingement plate 17. Inflow. The steam 40j and 40k flowing into the trailing edge passage 30E flows through the trailing edge passage 30E, cools the plurality of passages, flows out from the steam outlet 15 like 40M, and is collected.
[0033]
Of the steam flowing into the steam reservoir 3 of the outer shroud 50, 40N flows into the gaps 31E and 31F on the rear edge side as 40p and 40Q, respectively, and cools the gaps 31E and 31F on the back side and the stomach side, respectively. Then, the air flows into the cavity 33 of the outer shroud 51 and flows from the cavity 33 to the trailing edge passage 31G and 40s and 40t to the foremost passage of the blade trailing edge portion 30E, respectively, to cool them, and the steam outlet It flows out to 15 like 40U and is collected.
[0034]
2 is a cross-sectional view of the stationary blade shown in FIG. In the figure, the passages 30A, 30B, 30C, and 30D are divided into a back side and a ventral side as described in FIG. First, in the passage 30A, two circular cross-section spacers 20 and 21 are inserted vertically in the center, and the partition plates 5A-1 and 5A-2 are supported by the spacers 20 and 21, and a space is formed in the center. Forming. As shown in FIG. 1, the partition plates 5A-1 and 5A-2 are provided with a large number of holes 6 arranged in the vertical direction.
[0035]
Two cylindrical inserts are inserted on both sides of the partition plate to form passages 30A-1 and 30A-2, and a predetermined gap 31A is formed around the inner wall surface. A large number of holes 32 are arranged in the vertical direction at the front edge of the inserts of the passages 30A-1 and 30A-2 formed on the back side and the ventral side, and steam flowing through the passages 30A-1 and 30A-2 is provided. The hole 32 and the gap 31A are communicated so as to flow into the gap 31A on both sides. Further, a turbulator 8 is provided around the inner wall at the front end of the front edge, and the cooling effect is enhanced by stirring the flow of steam at the front end.
[0036]
Although the spacers 20 and 21 are shown as rod-shaped members having a round cross section, the spacers 20 and 21 are fixed by pressing the partition plates 5A-1 and 5A-2 outwardly on both sides. It does not have to be a bar, and may have a shape as shown in FIG. In FIG. 3, (a) is hollow tube-shaped spacers 20a and 21a, and (b) is a spacer that is pressed against both sides by elastic members 21a and 21b having a short cross section, for example. Such an example also has the same effect as the spacers 20 and 21.
[0037]
The passage 30A and the adjacent passage 30B are separated by ribs (partition walls), and holes 10 are provided in the ribs. The passage 30B is divided into a back side and an abdominal side by partition plates 5B-1 and 5B-2 similarly to 30A, and passages 30B-1 and 30B-2 are formed by inserting cylindrical inserts, respectively. Similarly, rod-shaped spacers 22 and 23 having a round cross section are inserted between the partition plates 5B-1 and 5B-2, and both partition plates are fixed and supported. In addition, the passages 30B-1 and 30B-2 are arranged so that two cylindrical inserts are inserted and a gap 31B is formed around the partition plate on both sides. And communicated with the gap 31A on the passage 30A side. The spacers 22 and 23 may be the same spacers as the spacers 20a and 21a or 20b and 21b shown in FIG.
[0038]
The passages 30 </ b> B and 30 </ b> C are also divided by ribs and communicate with each other through the holes 11. Similarly, the passage 30C is divided into a back side and an abdomen side by the partition plates 5C-1 and 5C-2 to form passages 30C-1 and 30C-2. Spacers 24 and 25 are inserted between the partition plates 5C-1 and 5C-2, and both partition plates are fixed and supported. In addition, the passages 30C-1 and 30C-2 are arranged so that two cylindrical inserts are inserted and a gap 31C is formed around the partition plates 24 and 25 on both sides. 11 is communicated with a gap 31B on the side of the passage 30B. In this case, the spacers 24 and 25 may be the spacers shown in FIGS.
[0039]
The passages 30C and 30D are also divided by ribs, and similarly, holes 12 are provided and communicate with each other. Similarly, the passage 30D is divided into a back side and an abdomen side by the partition plates 5D-1 and 5D-2 and the spacers 26 and 27. The partition plates 5D-1 and 5D-2 are each provided with a hole 13 and communicate with each other on both sides. Thus, passages 30D-1 and 30D-2 are formed. Similarly, two cylindrical inserts are inserted into the passages 30D-1 and 30D-2 so as to form a gap 31D around the partition plates 5D-1 and 5D-2. Is communicated with the gap 31C on the passage 30C side through the hole 12. In this case as well, the spacers 26 and 27 may be the spacers shown in FIGS. The passages 30D-1 and 30D-2 each have a plurality of holes 35 arranged vertically, and communicate with the gaps 31D on both sides.
[0040]
The three passages on the trailing edge side are closed (the hollow portion may be closed), and gaps 31E, 31F, and 31G are formed only on both sides of the blade inner wall, and these gaps are shown in FIG. So that the steam flows. That is, steam flows from the outside to the inner shroud in the gaps 31E and 31F, merges at the cavity 33, and flows from the inner side to the outer shroud to the gap 31G.
[0041]
In the stationary blade having the above cross-sectional shape, steam from the steam inlet 2 of the outer shroud 50 and steam from the cavity 16 of the inner shroud 51 flow into the passages 30A-1 and 30A-2 on the leading edge side (see FIG. 1). It flows from the hole 32 of 30A-1 and 30A-2 to the gap 31A on both sides of the periphery, and communicates with each other through the hole 6 of the partition plates 5A-1 and 5A-2 between the 30A-1 and 30A-2. The action of 8 is also added, and the leading edge is effectively cooled by stirring the steam. The steam that has cooled the passages 30A-1 and 30A-2 passes through the hole 10 from the gap 31A and flows into the gap 31B around the adjacent passages 30B-1 and 30B-2 (see 40b in FIG. 1).
[0042]
The steam that has flowed into the gap 31B cools the periphery of the passage and flows into the gap 31C around the next passages 30C-1 and 30C-2 from the hole 11 (see 40C in FIG. 1). On the other hand, in the passages 30B-1 and 30B-2, as described with reference to FIG. 1, the steam flows inward from the steam reservoir 3 of the outer shroud 50. Cooling is performed.
[0043]
The steam that has flowed into the gap 31C cools the periphery of the passage and flows into the gap 31D around the next passages 30D-1 and 30D-2 from the hole 12 (see 40d in FIG. 1). On the other hand, in the passages 30C-1 and 30C-2, as described with reference to FIG. 1, the steam flows inward from the steam reservoir 3 of the outer shroud 50. Effective cooling is achieved by both steams.
[0044]
The steam flowing into the gap 31D cools the periphery of the passage and flows into the passages 30D-1 and 30D-2 from the holes 35 on both sides. On the other hand, as described in FIG. 1, the steam 40 h flows into the passages 30 </ b> D- 1 and 30 </ b> D- 2 from the cavity 16 of the inner shroud 51 and flows into the outer shroud. Further, the passages 30D-1 and 30D-2 communicate with each other through the holes 13 of the partition plates 5D-1 and 5D-2, so that the steam is sufficiently stirred, and the passages 30D-1 and 30D-2 The inside and outside are cooled effectively and flows out from the steam outlet 14 of the outer shroud 50 and collected.
[0045]
FIG. 4 is an internal cross-sectional view of the outer shroud of the stationary blade shown in FIG. In the figure, the outer shroud 50 is connected to a blade having the configuration shown in FIG. 2, and steam is supplied from the outer shroud 50 and cooled by steam as described in FIGS. 1 and 2. On the other hand, the outer shroud 50 is provided with impingement plates 32, 33, 34, 35, 36, and 37 as shown in the figure. 33, 34 and 36, 37 are combined with large and small holes so that the steam flows out and uniformly hits the bottom surface of the shroud in a particularly severe part of the heat so that it can be recovered and effectively cooled. ing.
[0046]
According to the embodiment described above, the cooling passages 30A, 30B, 30C, and 30D on the leading edge side are divided by the partition plates on the back side and the ventral side, and the gaps 31A, 31B, 31C, 31D is formed, and steam is caused to flow through each passage and the surrounding gap, and the rear edge side front part is provided with gaps 31E, 31F, and 31G on the back side and the abdomen side inside the wall, respectively, and the steam is caused to flow through the gap. Since the edge side is configured such that steam flows through the passage 30E and the entire stationary blade is steam-cooled, the inside of the passage is thinly partitioned by a partition plate or an insert, and the narrow passage structure improves the pressure resistance strength. In addition, each passage 30A-1, 30A-2, 30B-1, 30B-2, 30C-1, 30C-2, gap 31A, 31B, 31C, 31D, 31E, 31F, 31G, steam in a narrow passage and narrow gap Since it passes, effective cooling is possible with less steam.
[0047]
In addition, the rear edge side is capable of steam cooling with narrow gaps 31E, 31F, 31G, and the conventional trailing edge cooling system uses the same cooling system as the front edge with steam, eliminating the need for air. The heat is recovered, and all the steam that has reached a high temperature is recovered and returned to the steam supply source for effective use and effective cooling. In addition, since the impeller cooling is used for the surface of the shroud, the shroud is effectively cooled. As a result, the pressure loss of the steam is remarkably reduced and the life of the stationary blade is extended.
[0048]
In the embodiment described above, an example of a single-stage stator blade has been described. However, the present invention is not limited to a single-stage stator blade, and is naturally applied to a two-stage stator blade or other stator blades. It is what you play.
[0049]
【The invention's effect】
The gas turbine steam-cooled stationary blade of the present invention comprises (1) a blade front half, a blade trailing edge front, and a blade trailing edge, and the blade front half and the blade trailing edge are divided into front and rear ribs, respectively. A plurality of passages penetrating from the outer shroud to the inner shroud are formed, and at the front edge of the trailing edge of the wing, front and rear are divided by ribs, and a predetermined gap is maintained on the back side and the ventral side penetrating from the outer shroud to the inner shroud. A plurality of gap passages are formed, and the outer steam supply cavity is communicated with the passage at the front half of the blade and the gap passage at the front portion of the blade trailing edge, and the inner steam cavity is communicated with the passage at the front half of the blade and the rear of the blade. A stationary vane configured to communicate with an edge passage; each passage in the front half of the blade is divided into a back side and a ventral side of the passage, and between the circumference of the passage and the rib wall surface. Inserted to form a predetermined gap. A pair of cylindrical inserts, spacers inserted between the same pair of cylindrical inserts to support and fix both inserts, and a plurality of ribs on the front half of the blades that divide each passage Through holes are arranged vertically, the gaps communicate with each other, and the gaps communicate with the inside of the cylindrical insert at the rearmost part; the cylinder except for the tail passage at the front half of the blade from the outer steam supply cavity Steam is passed through the insert, and flows from the inner steam cavity into the passage at the trailing edge of the blade and flows out to the outer shroud. It is characterized in that it is mixed into the cylindrical insert at the rearmost part.
[0050]
According to the invention of (1) above, a narrow steam passage by a pair of cylindrical inserts in the front half of the blade, a gap between each cylindrical insert and the passage and the rib wall, and a narrow gap passage on both sides of the front edge of the blade trailing edge. A narrow steam flow path is formed, enabling effective cooling with less steam, and steam is recovered from the outer shroud and returned to the steam supply source, reducing steam pressure loss. Further, since the trailing edge side is also cooled by steam, conventional air is not required, and the cooling system is simplified.
[0051]
In (2) of the present invention, a portion of the steam that has cooled the blade trailing edge front part flows into the foremost stage passage of the blade trailing edge part, so that cooling of the blade trailing edge part in (1) is enhanced. Further, in the invention of (3), the cylindrical inserts on both sides face each other and form a hollow cylindrical shape with the partition plates, and the space between the partition plates on both sides is supported by a spacer and fixed. The support and fixing of each cylindrical insert on the ventral side are ensured. Further, in (5), the spacer is a round bar, and in (6), it is an elastic material. Since the same effect can be obtained, design options are widened.
[0052]
In the invention of (4), a plurality of holes are arranged vertically on the front and rear partition plates of the wing front half of the invention of (3), and the cylindrical inserts on both sides are arranged by these holes. The steams communicate with each other from the inside to the outside, and the inflowing steam at the forefront and the outflowing steam at the end are made uniform by the stirring action, thereby enabling uniform cooling.
[0053]
In (7) of the present invention, the steam from the cylindrical insert in the first half of the blade flows into the gap through the hole, so the steam in the foremost cylindrical insert easily flows into the gap, and the steam flow in the gap Becomes smooth.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a gas turbine steam-cooled stationary blade according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a gas turbine steam-cooled stationary blade according to an embodiment of the present invention.
FIGS. 3A and 3B show another application example of a spacer for partitioning a cooling passage of a gas turbine steam cooling stationary blade according to an embodiment of the present invention, wherein FIG. 3A shows a hollow tube, and FIG. 3B shows an elastic material. It is the fragmentary sectional view used.
FIG. 4 is a cross-sectional view of an outer shroud of a gas turbine steam-cooled stationary blade according to an embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing an example of a single stage stationary blade of a conventional gas turbine.
[Explanation of symbols]
1 Static blade
2 Steam inlet
3 Steam pool
4,7,17,18 Impingement plate
5 partition plate
6,10,11,12,13 holes
8 Turbulators
14,15 Steam outlet
16 cavities
21, 21, 22, 23, 24, 25, 26, 27 Spacer
30A, 30B, 30C, 30D passage
30A-1, 30A-2, 30B-1, 30B-2 passage
30C-1, 30C-2, 30D-1, 30D-2 passage
30E Trailing edge passage
31A, 31B, 31C, 31D Clearance
31E, 31F, 31G Gap
32 holes
33, 34, 35, 36, 37 Impingement plate
40a-40u steam

Claims (7)

It consists of the front half of the wing, the front part of the wing trailing edge, and the rear edge of the wing. The front and rear edge of the wing is divided into ribs on the front and rear sides, and a plurality of gap passages are formed on the blade back side and blade abdomen side that penetrate from the outer shroud to the inner shroud. And the inner steam cavity is connected to the passage at the front half of the blade and the passage at the rear edge of the blade, respectively. A stationary vane; in each passage of the first half of the blade, the inside of the passage is divided into a blade back side and a blade belly side, and a predetermined gap is formed between the periphery of the passage and the rib wall surface A pair of cylindrical inserts inserted in the same pair A spacer inserted between the cylindrical inserts to support and fix both inserts is provided, and a plurality of through holes are arranged in the upper and lower ribs of the front half of the wing that divides the passages. And the gap is in communication with the inside of the cylindrical insert at the rearmost part; the steam is allowed to flow to the cylindrical insert from the outer steam supply cavity except for the rearmost passage at the front half of the blade, and for the inner steam. The air flows from the cavity into the passage at the trailing edge of the blade and flows out to the outer shroud, and also flows into the gap in the front half of the blade and enters the cylindrical insert at the rearmost portion through the hole in the rib. A gas turbine steam-cooled stationary blade, characterized in that: The clearance passage at the front portion of the blade trailing edge is configured to allow a part of the steam to flow out from the rear clearance passage to the outer shroud and to allow the remaining steam to flow into the foremost passage of the blade trailing edge portion. The gas turbine steam-cooled stationary blade according to claim 1, wherein: The pair of cylindrical inserts of each passage in the front half of the wing is configured such that side surfaces facing each other are formed by a partition plate, and are connected to the partition plate to form a cylindrical hollow portion. The gas turbine steam-cooled stationary blade according to claim 1, wherein 4. The gas turbine steam-cooled stationary blade according to claim 3, wherein a plurality of through holes are arranged in each of the opposing partition plates of the foremost passage and the rearmost passage in the front half of the blade. 2. The gas turbine steam-cooling static electricity according to claim 1, wherein the spacer has a rod-like shape with a circular cross section, and two spacers are inserted into each passage from the outside to the inside to support the partition plate. Wings. The gas turbine steam-cooled stationary blade according to claim 1, wherein the spacer is made of an elastic member. In front of the pair of cylindrical inserts on the front edge side of the front half of the blade, a steam outflow hole is provided, and the inside of the cylindrical insert communicates with the gap so that the steam flowing out from the cylindrical insert is The gas turbine steam-cooled stationary blade according to claim 1, wherein the gas turbine steam-cooled stationary blade is configured to flow into the gap from the hole.

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