JP2778871B2 - High and medium pressure turbine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-medium pressure turbine, and more particularly, to an improvement in an inner and outer casing of a high-medium pressure integrated turbine.

[0002]

2. Description of the Related Art There are two conventional high and medium pressure turbines as shown in FIGS. 3 and 4, for example. In any of these high and medium pressure turbines, steam supplied from a boiler (not shown) flows in from a main steam pipe 1, and expands and works in a governing stage 2 and a high pressure turbine 3. Thereafter, the high-pressure turbine exhaust steam is guided from the high-pressure turbine outlet 4 through the high-pressure turbine outlet pipe 5 to the boiler (not shown). The steam reheated by the boiler flows from the intermediate pressure turbine inlet pipe 6, expands in the intermediate pressure turbine 7,
It performs work, flows out of the medium-pressure turbine exhaust pipe 8, and is led to a low-pressure turbine (not shown).

In the conventional example shown in FIG. 3, a high-pressure exhaust chamber 9 and a high-pressure dummy 10 are provided in a plurality of pipes 14a provided in a space 13 surrounded by a high-pressure outer casing 11 and a high-pressure inner casing 12. , 14b. In this case, conventionally, a plurality of pipes 14a connecting the upper side of the high-pressure dummy 10 and the high-pressure exhaust chamber 9 are all connected from the upper side of the high-pressure dummy 10 to the upper side of the high-pressure exhaust chamber 9. A plurality of pipes 1 for connecting the get-off side of the dummy 10 and the high-pressure exhaust chamber 9
4b are also high pressure exhaust chambers 9 from the lower side of the high pressure dummy 10
Is connected to the disembarking side.

[0004] On the other hand, in the conventional example shown in FIG.
The high-pressure outer casing 11 and the high-pressure inner casing 12 are cooled by flowing into the space 13 surrounded by the high-pressure outer casing 11 and the high-pressure inner casing 12 through a and 15b. In this case, conventionally, a plurality of pipes 15a connecting the space 13 and the upper side of the high-pressure dummy 10 are connected.
Are all connected from the upper side of the high-voltage dummy 10 to the upper side of the space 13, and a plurality of pipes 15 b connecting the lower side of the high-pressure dummy 10 and the space 13 are also connected to the lower side of the high-pressure dummy 10. It is connected to the getting-off side of the space 13.

[0005]

In the prior art described above, the one shown in FIG. 3 has the following problems. That is, in the high-pressure exhaust chamber 9, the pressure distribution generally differs between the upper and lower vehicles due to the influence of the high-pressure turbine exhaust steam flow. Now, in FIG.
Consider a case in which the pressure on the upper vehicle is higher than that on the lower vehicle. At this time, the flow of steam in the pipes 14a and 14b flows in the direction of the high-pressure dummy 10 through the upper pipe 14a, and conversely, in the lower pipe 1
4b, the direction may be opposite to the direction of the exhaust chamber 9 on the up and down vehicle sides.

In such a case, in the conventional example shown in FIG. 3, as described above, a plurality of pipes 14a connecting the upper side of the high-pressure dummy 10 and the high-pressure exhaust chamber 9 are all connected to the high-pressure dummy 10. A plurality of pipes 14b connected from the upper side to the upper side of the high-pressure exhaust chamber 9 and communicating between the lower side of the high-pressure dummy 10 and the high-pressure exhaust chamber 9 are also connected to the high-pressure exhaust chamber 9 from the lower side of the high-pressure dummy 10. Since the temperature of the steam in the high-pressure exhaust chamber 9 is lower than the temperature of the steam in the high-pressure dummy 10, the temperature of the steam in the high-pressure inner compartment 12 is lower than that in the lower vehicle. Lower. As a result, the high-pressure inner casing 12 is deformed due to the difference in thermal expansion between the upper and lower vehicles,
As a result, the clearance of each part of the turbine changes in the circumferential direction, and the contact of the fins and the excessive clearance occur, which causes a problem that the performance of the turbine is reduced.

Accordingly, a first problem to be solved by the present invention is to eliminate the temperature difference between the upper side and the lower side of the high pressure inner casing in the high-medium pressure turbine, and to deform the high pressure inner casing due to the difference in thermal expansion. Is to prevent

Further, the conventional example shown in FIG. 4 also has the following problem. That is, when the high-pressure dummy 10 is eccentric due to a difference in thermal expansion, the leak area of the high-pressure dummy 10 differs between the upper and lower vehicles, and the flow rate of steam passing therethrough differs. In this case, in the conventional example shown in FIG. 4, as described above, a plurality of pipes 15a connecting the space 13 surrounded by the high-pressure outer casing 11 and the high-pressure inner casing 12 and the upper side of the high-pressure dummy 10 are connected. Is the space 1 from the upper side of the high-voltage dummy 10
3, and a plurality of pipes 15b connecting the unloading side of the high-pressure dummy 10 to the space 13 are also connected from the unloading side of the high-pressure dummy 10 to the unloading side of the space 13. In the space 13, the amount of the cooling steam flowing in differs between the upper and lower vehicle sides, and therefore the temperature differs.
As a result, the high-pressure outer casing 11 and the high-pressure inner casing 12 are deformed due to a difference in thermal expansion between the upper side and the lower side. There has been a problem that an excessively large volume is generated and performance of the turbine is reduced.

Therefore, a second problem to be solved by the present invention is to eliminate the temperature difference between the upper side and the lower side of the space surrounded by the high-pressure outer casing and the high-pressure inner casing in the high-medium pressure turbine, This is to prevent deformation of the high-pressure outer casing and the high-pressure inner casing due to the difference in thermal expansion.

[0010]

In order to solve the above-mentioned first problem, the present invention according to a first aspect of the present invention is directed to a high-pressure dummy in the inner and outer casings of a high-to-medium pressure integrated turbine. Are connected alternately from the upper side of the high-pressure dummy to the upper side and the lower side of the high-pressure exhaust chamber, and also a plurality of pipes connecting the lower side of the high-pressure dummy to the high-pressure exhaust chamber. The high-pressure dummy is connected alternately from the lower side of the high-pressure dummy to the upper side and the lower side of the high-pressure exhaust chamber.

[0011] In order to solve the second problem,
According to a second aspect of the present invention, a plurality of pipes for connecting a space between the high-pressure outer casing and the high-pressure inner casing in the inner and outer casings of the high-medium pressure integrated turbine and the upper side of the high-pressure dummy are connected to the high-pressure dummy. A plurality of pipes which are alternately connected from the upper vehicle side to the upper vehicle side and the lower vehicle side of the space, and which communicate the space and the lower vehicle side of the high-voltage dummy, also from the lower vehicle side of the high-voltage dummy to the upper vehicle side and the lower space It is connected alternately to the getting off side.

[0012]

According to the first aspect of the present invention, in the plurality of pipes connecting the high-pressure dummy and the high-pressure exhaust chamber, the plurality of upper pipes are alternately arranged from the upper side to the lower side and the upper side. To the high-pressure exhaust chamber, the amount of steam flowing from the high-pressure exhaust chamber to the high-pressure dummy is equal between the upper side and the lower side of the high-pressure dummy. The temperature difference between the upper and lower sides of the inner compartment is eliminated. As a result, it is possible to prevent the high-pressure inner casing from being deformed due to a difference in thermal expansion between the upper side and the lower side.

According to the second aspect of the present invention, in the plurality of pipes for connecting the high-pressure dummy with the space surrounded by the high-pressure outer casing and the high-pressure inner casing, Connect alternately from the get-on side to the get-off side and get-off side,
Also, since a plurality of pipes on the dismount side are connected in the same manner, even when the flow rate of steam passing through the high-pressure dummy is different between the get-on side and the get-off side, it is surrounded by the high-pressure outer compartment and the high-pressure inner compartment. In the space, the amount of steam flowing in is equal on the upper and lower sides, so that there is no temperature difference between the upper and lower sides of the space. As a result, it is possible to prevent the high-pressure outer casing and the high-pressure inner casing from being deformed due to a difference in thermal expansion between the upper side and the lower side of the space.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention described in claim 1. The same parts as those shown in FIG. 3 are denoted by the same reference numerals, and duplicate description will be omitted. .

As shown in FIG. 1, according to the present embodiment, a plurality of pipes 14a connecting the upper side of the high-pressure dummy 10 and the high-pressure exhaust chamber 9 are arranged from the upper side of the high-pressure dummy 10 to the high-pressure exhaust chamber. A plurality of pipes 14b alternately connected to the upper and lower sides of the high-pressure dummy 10 and communicating between the lower side of the high-pressure dummy 10 and the high-pressure exhaust chamber 9 are also connected to the high-pressure exhaust chamber 9 from the lower side of the high-pressure dummy 10.
Are alternately connected to the get-off side and the get-off side.

As described above, in the plurality of pipes 14a and 14b connecting the high-pressure dummy 10 and the high-pressure exhaust chamber 9, the plurality of upper pipes 14a are alternately moved from the upper side to the lower side and the upper side. A plurality of pipes 14 for connecting and getting off
b, the amount of steam flowing from the high-pressure exhaust chamber 9 to the high-pressure dummy 10 is equal between the upper side and the lower side of the high-pressure dummy 10.
2. There is no temperature difference between the up and down sides of the vehicle. as a result,
It is possible to prevent the deformation of the high-pressure inner casing 12 due to the difference in thermal expansion between the upper side and the lower side.

FIG. 2 shows an embodiment of the present invention according to claim 2, in which the high voltage dummy 10 shown in FIG. 4, the same parts as those shown in FIG. 4 are denoted by the same reference numerals, and overlapping description will be omitted.

As shown in FIG. 2, according to the present embodiment, a plurality of pipes 15a connecting the space 13 surrounded by the high-pressure outer casing 11 and the high-pressure inner casing 12 to the upper side of the high-pressure dummy 10 are connected.
Are connected alternately from the upper side of the high-voltage dummy 10 to the upper side and the lower side of the space 13, and a plurality of pipes 15 b connecting the space 13 and the lower side of the high-pressure dummy 10 also From the side, the space 13 is alternately connected to the upper and lower vehicles.

As described above, in the plurality of pipes 15a and 15b connecting the high-pressure dummy 10 with the space 13 surrounded by the high-pressure outer casing 11 and the high-pressure inner casing 12, the plurality of upper pipes 15a are respectively connected. By connecting alternately from the upper vehicle side to the upper vehicle side and the lower vehicle side, and also connecting the plurality of pipes 15b on the lower vehicle side, the flow rate of steam passing through the high-pressure dummy 10 is changed between the upper vehicle side and the lower vehicle side. Even if different, high-pressure outer casing 1
In the space 13 surrounded by the inner space 1 and the high-pressure inner cabin 12, the amount of steam flowing in is equal on the upper side and the lower side, so that the temperature difference between the upper side and the lower side of the space 13 is eliminated.
As a result, it is possible to prevent the high-pressure outer casing 11 and the high-pressure inner casing 12 from being deformed due to a difference in thermal expansion between the upper side and the lower side of the space 13.

[0021]

As described above, according to the present invention, it is possible to prevent thermal deformation of the high-pressure inner casing and / or the high-pressure outer casing in the high-to-medium pressure turbine. Eliminate the change in direction to prevent fin contact and excessive clearance,
The performance of the turbine can be prevented from deteriorating.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a high and medium pressure turbine according to the present invention.

FIG. 2 is a sectional view of a main part showing another example of a high-to-medium pressure turbine according to the present invention.

FIG. 3 is a cross-sectional view showing an example of a conventional high and medium pressure turbine.

FIG. 4 is a cross-sectional view showing another example of a conventional high / medium pressure turbine.

[Explanation of symbols]

 Reference Signs List 9 high-pressure exhaust chamber 10 high-pressure dummy 11 high-pressure outer casing 12 high-pressure inner casing 13 space surrounded by high-pressure outer casing and high-pressure inner casing 14a, 14b piping 15a, 15b piping

Claims (2)

(57) [Claims] 1. A plurality of pipes communicating between the upper side of a high-pressure dummy and the high-pressure exhaust chamber in the inner and outer casings of the high-medium pressure integrated turbine are arranged from the upper side of the high-pressure dummy to the upper side and the lower side of the high-pressure exhaust chamber. Side, and a plurality of pipes connecting the lower side of the high-pressure dummy and the high-pressure exhaust chamber are alternately connected from the lower side of the high-pressure dummy to the upper side and the lower side of the high-pressure exhaust chamber. High-to-medium pressure turbine characterized. 2. A plurality of pipes for connecting a space surrounded by the high-pressure outer casing and the high-pressure inner casing in the inner and outer casings of the high-medium pressure integrated turbine with the upper side of the high-pressure dummy are connected to the upper side of the high-pressure dummy. Also, a plurality of pipes which are alternately connected to the upper side and the lower side of the space from the lower side of the space and which communicate the space and the lower side of the high-voltage dummy also alternately from the lower side of the high-voltage dummy to the upper side and the lower side of the space. A high-to-medium-pressure turbine connected to a turbine.