JPS63268902A - Casing for turbine - Google Patents

Abstract

PURPOSE:To reduce the axial length of a casing and reduce the weight of a turbine by disposing a middle pressure extraction control valve steam chamber and a low pressure extraction control valve steam chamber to be adjacent to each other through a partition wall of the casing. CONSTITUTION:A middle pressure extraction control valve steam chamber 2 and a low pressure extraction control valve steam chamber 4 are parted by a partition wall 10 as part of a casing 8 and disposed adjacent to each other. Steam after working in a high pressure turbine works in a middle pressure turbine and a low pressure turbine in a middle pressure extraction part D and a low pressure extraction part E respectively and is discharged to a condenser. By composing and actuating a turbine like this, the middle pressure extraction part D and the low pressure extraction part E can be composed to form a block to be integral with the casing 8, so the length of the casing is reduced, the weight can be reduced, and the structure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a turbine casing for a single-cylinder two-stage control bleed turbine having the function of adjusting the amount of steam in the steam turbine at intermediate pressure and low pressure.

[Conventional technology]

This type of steam turbine is applied to an output of about 40 MW to 60 MW, and houses a high pressure turbine, an intermediate pressure turbine, and a low pressure turbine in a single cylinder, and steam flows from the high pressure turbine to the low pressure turbine via the intermediate pressure turbine. The amount of steam is controlled by extracting air at low pressure.

FIG. 2 shows an overall conceptual diagram of the two-stage control extraction turbine 12. High-temperature, high-pressure steam from the boiler B is supplied to the high-pressure turbine 13 of the two-stage control extraction turbine 12 via the main steam stop valve 16 and the high-pressure regulating valve 17. The steam that has done work in the high-pressure turbine 13 is sent to the intermediate-pressure extraction control valve steam chamber 3 through the intermediate-pressure extraction port 18 to the intermediate-pressure process steam system Pl, and the steam that is sent to the intermediate-pressure turbine 14 via the intermediate-pressure nozzle chamber 5. It can be divided into The amount of steam supplied to the intermediate pressure turbine 14 is adjusted by opening and closing the intermediate pressure extraction control valve 1, and the pressure of the steam sent to the intermediate pressure process steam system P1 is maintained at a constant pressure.

The steam that has done work in the intermediate pressure turbine 14 is sent to the low pressure turbine 15 via the low pressure nozzle chamber 6 or the low pressure inlet chamber 6I and the steam sent from the low pressure extraction port to the low pressure process steam system P2 in the low pressure extraction control valve steam chamber 4. Divided into steam. The amount of steam supplied to the low-pressure turbine 15 is adjusted by opening and closing the low-pressure oil control valve 2, and the pressure of the steam sent to the low-pressure purifier steam system P2 is maintained at a constant pressure. The steam that has done work in the low pressure turbine 15 is discharged from the exhaust port 20 to the condenser C.

There is a partition wall 1 between the intermediate pressure turbine and the low pressure turbine.
0 so that steam does not directly flow into the low pressure turbine 15. The power received by the high-pressure turbine, intermediate-pressure turbine, and low-pressure turbine rotates a generator 21 directly connected to the vehicle m7J to obtain electrical output. 9 is a row of blades of the turbine.

FIG. 3 is a sectional view showing the structure of the extraction part of a conventional turbine casing, showing a turbine casing having a row of impulse blades. An intermediate pressure nozzle chamber 3, an intermediate pressure bleed section D1 equipped with an intermediate pressure bleed force reduction valve 1, and a low pressure oil control valve steam chamber 4;
There is a low-pressure bleed section E equipped with a low-pressure nozzle chamber 6 and a low-pressure bleed control valve 2.

The steam that has done work in the high-pressure turbine is divided into steam sent to the intermediate-pressure process steam system PHC by opening and closing the intermediate-pressure extraction control valve 1 at the intermediate-pressure extraction section, and steam sent to the intermediate-pressure turbine from the intermediate-pressure nozzle 5. The steam that has been subjected to work in the intermediate-pressure turbine is converted into steam sent to the low-pressure process steam P2 by opening and closing the low-pressure extraction control valve 2 in the low-pressure extraction section E, and steam sent from the low-pressure nozzle chamber 6 to the low-pressure turbine 15. Can be divided. The medium pressure bleed air control valve steam chamber 3 and the low pressure bleed air control valve steam chamber 4
The front and rear in the black direction are partitioned by a partition wall 10, stationary blades 9I, and blade rows 9.

[Problem that the invention seeks to solve]

As mentioned above, conventionally, the medium pressure bleed air control valve steam chamber 3 and the low pressure bleed air control valve steam chamber 4, which were constructed in the casing (upper half) 8, were separated by the partition wall 10. Since it is partitioned by the stationary blades 91 and the multiple stages of blade rows 9, the axle 7 becomes longer, and the casing (upper half) 8 becomes longer in the axial direction, which has the drawback of increasing the weight of the axle and the turbine casing. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a turbine casing in which the axle 7 is shortened and the structure of the intermediate pressure bleed section and the low pressure bleed section are simplified and the weight is reduced.

[Means for solving problems]

According to the present invention, the intermediate pressure bleed air control valve steam chamber and the low pressure bleed air control valve steam chamber are separated by a partition wall that forms a part of the casing and are arranged adjacent to each other. The low-pressure bleed air section is constructed integrally with the casing without a block.

[Effect]

In the turbine casing of the present invention, the intermediate pressure bleed air control valve steam chamber and the low pressure oil control valve steam chamber are separated by a partition wall and are arranged adjacent to each other. The bleed parts are close together and form a block in the upper half of the casing.

〔Example〕

FIG. 1 is a sectional view showing the structure of the bleed part of a casing according to an embodiment of the present invention, and the same parts as in FIG. 3 are given the same numbers. In the IT diagram, the steam that has done work in the high-pressure turbine enters the intermediate-pressure extraction control valve steam chamber 3, where the intermediate-pressure extraction control valve 1 is opened and closed to send the steam to the intermediate-pressure process steam system and the intermediate-pressure nozzle chamber. 5, and the steam that has done work in the intermediate pressure turbine is sent to the low pressure extraction control valve steam chamber 3.
The steam enters the low pressure extraction control valve 2 and is sent to the low pressure process steam system, and the low pressure inlet chamber 6! It is divided into steam sent to The steam that has done work in the low pressure turbine is discharged to the condenser.

The medium pressure bleed air control valve 1, the medium pressure bleed air control valve steam chamber 3, and the intermediate pressure nozzle chamber 5 are collectively referred to as the medium pressure bleed air section, and the low pressure bleed air control valve 2, the low pressure bleed air control valve steam chamber 4, and the low pressure inflow. Room 11
are collectively referred to as the low-pressure extraction section E.

The medium pressure bleed air control valve steam chamber 3 and the low pressure bleed air control valve steam chamber 4
are separated by a partition wall 10 forming a part of the casing (upper half) 8 and are arranged adjacent to each other. The partition wall IO partitions the medium pressure bleed section and the low pressure bleed section E together with the partition wall of the casing (lower half) located at the same position in the direction of the casing. The medium-pressure bleed section and the low-pressure bleed section E form a unified block and are constructed integrally with the two-part casing (lower half) 8. Note that the blade row 9 attached to the axle 7 is connected to the partition wall 1
0, it partitions the medium pressure bleed air control valve steam chamber 3 and the low pressure bleed air control valve steam chamber 4 in the axial direction.

Although the turbine blade row in FIG. 1 shows a reaction blade row, the present invention can also be applied to an impulse blade row.

〔Effect of the invention〕

According to the present invention, the intermediate pressure bleed air regulator steam chamber 3 and the low pressure bleed air regulator steam chamber 4 are arranged adjacent to each other, and the intermediate pressure bleed part and the low pressure bleed part E form a block and the casing (the upper half )8
Since the axle shaft 7 and the casing 8 are constructed integrally with each other, the axial lengths of the axle 7 and the casing 8 are also shortened, and the weight of the turbine is reduced. Furthermore, the structures of the intermediate pressure bleed section and the low pressure bleed section E are simplified.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the extraction part structure of a turbine casing according to an embodiment of the present invention, Fig. 2 is a schematic diagram showing the entire two-stage control oil-air turbine, and Fig. 3 is a conventional example 1 for a turbine. FIG. 3 is a cross-sectional view showing the structure of the bleed part of the casing. ]: Medium pressure bleed air control valve, 2: Low pressure bleed air control valve, 3: Medium pressure control valve steam chamber, 4: Low pressure bleed air control valve steam chamber, 5: Medium pressure nozzle chamber, 6: Low pressure nozzle chamber, 61: Low pressure inflow chamber, 8: casing (upper half), 10: partition wall, 12: two-stage control extraction turbine, 13: high pressure turbine, 14: intermediate pressure turbine,
15: Low pressure turbine, D: Medium pressure extraction section, E: Low pressure extraction section. 5゛j' 1st year old (FJ5! Seven Yamaguchi years old 1', 2nd year old)
−゛District Z

Claims (1)

[Claims] 1) The amount of steam flowing from the high-pressure turbine to the low-pressure turbine via the intermediate-pressure turbine is controlled by an intermediate-pressure extraction control valve steam chamber, an intermediate-pressure nozzle chamber, an intermediate-pressure extraction section equipped with an intermediate-pressure extraction control valve, and a low-pressure extraction control valve steam chamber. , a single-cylinder two-stage control bleed turbine having a function of adjusting with a low-pressure bleed section equipped with a low-pressure nozzle chamber or a low-pressure inlet chamber, and a low-pressure bleed-air regulator; are arranged adjacent to each other and separated by a partition wall that forms a part of the casing, and in this case, the medium pressure bleed part and the low pressure bleed part form a block and are constructed integrally with the casing. Turbine casing.