WO2014193043A1

WO2014193043A1 - Lifting apparatus and method of withdrawing rotor shaft of generator in combined power generation plant using same

Info

Publication number: WO2014193043A1
Application number: PCT/KR2013/008105
Authority: WO
Inventors: 박능출; 최주몽; 조영우
Original assignee: 한국남부발전 주식회사
Priority date: 2013-05-28
Filing date: 2013-09-09
Publication date: 2014-12-04
Also published as: KR20140139914A; KR101481089B1

Abstract

Disclosed is an invention relating to a method of withdrawing a rotor shaft of a generator in a combined power generation plant using a lifting apparatus. The disclosed method of withdrawing a rotor shaft of a generator in a combined power generation plant using a lifting apparatus, wherein a gas turbine including an upper casing assembly and a lower casing assembly, a generator and a steam turbine are arranged in the combined power generation plant, comprising the steps of: separating the upper casing assembly from the lower casing assembly, thereby forming a movable space part in the gas turbine; separating the rotor shaft of the generator that is flange coupled to a shaft of the gas turbine and to a shaft of the steam turbine; installing a lifting apparatus in the generator and lifting the generator using the lifting apparatus; hanging the lifting apparatus from an end portion of the rotor shaft exposed in the direction of the gas turbine in the generator by using a lifting member connected to an overhead crane; moving the overhead crane and pulling the rotor shaft in the direction of the movable space part by means of the lifting member, thereby withdrawing a portion of the rotor shaft; and hanging a central portion of the rotor shaft from the lifting member and withdrawing, lifting and moving the entire rotor shaft.

Description

Extraction method of generator rotor shaft of lifting device and combined cycle power plant using same

The present invention relates to a lifting device and a method for extracting a generator rotor shaft of a combined cycle power plant using the same, and more particularly, to disassemble the flange of the rotor shaft of the generator rotor and the rotation shaft of the steam turbine and the gas turbine, using a lifting device to After lifting, the rotor shaft is pulled out, and thus the weight of the equipment is reduced, and a lifting apparatus capable of simplifying the drawing process, and a method for extracting the rotor rotor shaft of the generator of the combined cycle power plant using the same.

In general, a combined power plant is a power plant that produces electricity by using a gas turbine, a generator, and a steam turbine in combination.

These gas turbines, generators, steam turbines are used in combination appropriately, and recently, the gas turbine, generator, steam turbine is also used as a single shaft (shaft) connected in a straight line arrangement.

1 is a view schematically showing a conventional one shaft type combined cycle power plant.

In a conventional uniaxial combined cycle power plant, a gas turbine (2) producing primary power by burning fuel supplied through a supply pipe (2), and a boiler using exhaust gas heat discharged to an outlet of the gas turbine (2). To produce steam, and to arrange the steam turbine (4), the gas turbine (2) and the steam turbine (4) in a row to produce secondary power through the steam produced, the shaft of the gas turbine (3) ) And a generator 6 for generating electricity using the rotation of the rotor shaft 8 coupled to both the shaft 5 and the steam turbine 4, respectively.

Here, the steam turbine 4 may include a high pressure steam turbine and a low pressure steam turbine.

The rotor shaft 8 is configured to include a rotor installed across the center hole of the stator of the generator 6 and is formed longer than the length of the generator 6 and has a length of the gas turbine shaft 3.

Flanges

7 and 9 which are respectively coupled to the flanges of the flange and the steam turbine shaft 5.

The uniaxial combined cycle power plant first uses the combustion energy of the fuel to drive the gas turbine (2) to obtain power, and generates steam through a boiler (not shown), from which the steam turbine (4) It drives to generate power secondary.

At this time, the long-term use of the uniaxial hybrid power generation equipment may cause damage, so the gas turbine (2), generator (6) and steam turbine (4) should be periodically disassembled and the rotor shaft of the generator (4) should be maintained.

In the conventional uniaxial hybrid power generation facility looks at the rotor shaft 8 withdrawal method of the generator (6). Part of the gas turbine 2 and the steam turbine 4 on both sides of the generator 6 are disassembled, and the flange of the gas turbine shaft 3 and the steam turbine shaft 5 and the flange of the rotor shaft 8 (7). And 9) separately.

Then, a horizontal beam is installed on the disassembled movement path of the generator 6, and a frame for installing a large crane equipped with a trolley and a sliding device is mounted on the horizontal beam. Install. Then, the generator is lifted by the lifting strap of the large-capacity crane and slad laterally, and then the generator is lowered to the floor. Then, after the rotor shaft 8 is drawn out from the generator 6 by using a large-capacity crane, maintenance is performed such as repair of the bearing.

Background art of the present invention has been presented in the Republic of Korea Patent Registration No. 0846270 (name of the invention: auxiliary combustion system of the combined cycle power plant, registration date: 2008.07.03).

In order to take out the rotor shaft by separating the generator from the conventional combined cycle power plant, a large-capacity crane that lifts the generator should be installed on the ceiling. And there is a problem that the repair cost increases.

Therefore, there is a need for improvement.

The present invention has been created by the necessity as described above, an object of the present invention, after disassembling the flange of the generator rotor shaft and the steam turbine and the shaft of the gas turbine, by lifting the generator using a lifting device to secure space The present invention provides a lifting device capable of reducing the weight of a facility by drawing out a rotor shaft and simplifying a drawing process, and a method of extracting a generator rotor shaft of a complex power generation facility using the same.

Another object of the present invention, the lifting device is installed on the bottom of the supporter unit mounted on the generator side by lifting the generator set distance lifts the lifting device that can easily lift the generator even in a state in which the lifting device installation space is not secured to the bottom of the generator And to provide a generator rotor shaft withdrawal method of the composite power plant using the same.

In order to achieve the above object, the lifting device of the present invention, a pair is provided on both sides of the housing of the generator, the support portion is provided with a plurality of seating portions; A lift unit supported on a bottom surface of the seating unit and lifting the generator through the support unit by a lift operation; And a control unit which controls each of the elevating units to raise and lower the generator evenly by elevating to the same height.

In addition, the support portion, the support frame is disposed on both sides of the housing of the generator, the seating portion is formed on both corners; And characterized in that it comprises a coupling member for coupling the support frame to the housing of the generator.

In addition, the support portion is provided with a bending prevention frame, characterized in that to prevent deformation of the support frame.

In addition, the seating portion is characterized in that it is reinforced by a reinforcing frame provided on the seating portion.

In addition, the lifting portion, the bottom plate placed on the floor; An installation block provided on the bottom plate and extending upward; And a cylinder member provided on an upper side of the installation block and in contact with a bottom surface of the seating portion.

In addition, the installation block is characterized in that the mutual fixing by the connecting member.

In order to achieve the above object, the method of extracting the rotor shaft of the generator of the combined cycle power plant using the lifting device of the present invention, in the combined cycle power plant including the upper casing assembly and the lower casing assembly, the generator and the steam turbine is arranged in the A method of drawing out a rotor shaft of a generator, the method comprising: separating the upper casing assembly from the lower casing assembly to form a moving space in the gas turbine; Separating the shaft of the gas turbine and the rotor shaft of the generator flanged to the shaft of the steam turbine; Installing a lifting device on the generator, and elevating the generator using the lifting device; Hooking the end of the rotor shaft exposed from the generator to the end of the rotor shaft using a lifting member connected to the ceiling crane; Moving the ceiling crane to draw a portion of the rotor shaft by pulling the rotor shaft toward the moving space part with the lifting member; And walking the central portion of the rotor shaft to a lifting member, and lifting and lifting the entire rotor shaft.

In addition, the lifting device installation and generator lifting step, the step of mounting a support frame having a seating portion using a coupling member on both sides of the generator; Disposing a lifting unit below the seating unit; And driving a cylinder member to lift the generator through the seating portion.

In addition, in the lifting device installation and generator lifting step, the lifting device is characterized in that for lifting the generator above the height capable of withdrawing the rotor shaft through the moving space.

In addition, in the step of drawing out a part of the rotor shaft, the lifting member is characterized in that withdraw 60 to 70% of the total length of the rotor shaft.

In addition, after the step of drawing out a part of the rotor shaft, characterized in that it further comprises the step of supporting the bottom surface of the rotor shaft using at least one bracing member.

The generator rotor shaft withdrawal method of the combined cycle power plant using the lifting device according to the present invention, by disassembling the flange of the shaft of the generator rotor shaft and the steam turbine and the shaft of the gas turbine, by lifting the generator using a lifting device to secure a space After the rotor shaft is drawn out, the weight of the equipment can be reduced, the drawing process can be simplified, and inspection and repair costs can be reduced.

Lifting device according to the present invention, by lifting the generator set distance by installing the lifting portion on the bottom of the supporter portion mounted on the generator side can easily lift the generator even when the installation space of the lifting device is not secured to the lower part of the generator It can provide convenience in use.

1 is a view showing a conventional single-axis combined cycle power generation facility.

2 is a perspective view of a state in which a lifting device according to an embodiment of the present invention is installed in a generator of a complex power generation facility.

3 is an exploded perspective view of a lifting device according to an embodiment of the present invention.

4 is a view showing a state in which the generator is lifted by the lifting device according to an embodiment of the present invention.

Figure 5 is a state diagram for separating the upper case assembly of the gas turbine in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention.

Figure 6 is a state diagram for separating the flange in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention.

7 is a state diagram in which a lifting device is installed and lifted on a generator in a generator rotor shaft withdrawal method of a combined cycle power plant according to an embodiment of the present invention.

8 is a state diagram for hanging the lifting member on the rotor shaft in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention.

9 is a state diagram for drawing a part of the rotor shaft in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention.

FIG. 10 is a state diagram in which a lifting member is hooked to a central portion of a rotor shaft in a method of extracting a generator rotor shaft of a complex power plant according to an exemplary embodiment of the present invention.

11 is a flow chart showing a generator rotor shaft withdrawal process of the combined cycle power plant according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a generator rotor shaft withdrawal method of a lifting device and a composite power plant using the same according to an embodiment of the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

Figure 2 is a perspective view of a state in which the lifting device is installed in the generator of the combined cycle power plant according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the lifting device according to an embodiment of the present invention, Figure 4 is 2 is a view illustrating a state in which a generator is lifted by a lifting device according to an embodiment.

1 to 4, the lifting apparatus 100 according to an embodiment of the present invention includes a support unit 20, a lifting unit 30, and a control unit 40.

The support part 20 is provided with a pair of both sides of the housing 160 of the generator 16 applied to the complex power generation equipment, and a plurality of seating portions 22 are provided.

The generator 16 is provided with a stator 162 inside the housing 160, and an installation hole 164 through which both sides of the rotor shaft 18 are inserted is formed in the center of the stator 162.

Since the housing 160 of the generator 16 does not have a space on the bottom, the lifting device 100 of the present invention may be provided on both sides of the generator 16.

The support unit 20 may be detachably provided at both sides of the housing 160 of the generator 16.

The seating part 22 serves to support the load of the generator 16 when providing the upper pressing force to the lifting part 30 to be described later.

The support part 20 includes a support frame 24 and a coupling member 26.

Support frame 24 is disposed on both sides of the housing 160 of the generator 16, the seating portion 22 is formed on both corners.

The support frame 24 is formed in a thick plate shape and serves to evenly distribute the entire weight of the generator 16 through the side of the housing 160.

The support frame 24 is preferably formed to gradually widen from the lower side to the upper side.

Coupling member 26 is configured to couple the support frame to the housing of the generator.

A plurality of coupling members 26 are detachably provided at predetermined intervals in the horizontal and vertical directions to evenly transfer the load of the housing 160 of the generator 16 to the support frame 24.

In other words, as the number of the coupling members 26 increases, the load applied to each coupling member 26 is reduced, thereby preventing the coupling member 26 from being damaged.

In this way, the installation number of the coupling member 26 and the installation position of the housing 160 of the generator 16 can be variously changed.

The support unit 20 may include a bending prevention frame 28 to prevent deformation of the support frame 24.

The bending prevention frame 28 has a lattice shape on the side of the support frame 24 and serves to reinforce and distribute the load when the housing 160 of the generator 16 is lifted through the support frame 24. This prevents the deformation of the support frame 24.

In other words, the bending prevention frame 28 is derived from the effect of increasing the thickness of the support frame 24 can prevent the support frame 24 from being deformed in various forms.

The bending prevention frame 28 may be fixed to the contact surface between the gratings and the side of the support frame 24 through welding.

The seating part 22 is reinforced while being supported by the reinforcing frame 29 provided above the seating part 22.

The reinforcing frame 29 is vertically bonded to the upper side of the seating portion 22 to be vertically supported by a vertical reinforcement frame (29a) is fixed to the side of the support frame 24 and horizontally in contact with the upper side of the vertical reinforcement frame (29a) It includes a horizontal reinforcing frame (29b) is fixed to the side of the support frame 24 is supported.

The reinforcement frame 29 may be fixed to the seating part 22 and the support frame 24 by welding.

The lifting portions 10 are respectively supported on the bottom surface of the seating portion 22 and are configured to lift the generator 16 through the support portion 20 by the lifting operation.

The lifting unit 30 includes a bottom plate 32, an installation block 34, and a cylinder member 36.

The bottom plate 32 is configured in a rectangular plate shape to distribute and support the load.

The installation block 34 is provided on the bottom plate 32 and extends upward.

The installation block 34 has a rectangular columnar shape and extends upward.

An upper side of the bottom plate 32 and an outer side surface of the installation block 34 may be provided with a reinforcement bracket 33 for reinforcing the strength of the bottom plate 32 and the installation block 34.

The reinforcement bracket 33 prevents the installation block 34 from being folded and flipped over from the bottom plate 32.

The mounting block 34 may be fixed to each other by the connecting member 38.

As shown in Figure 4, the connecting member 38 is fixed to the side of the plurality of installation blocks 34 to prevent each installation block 34 from falling to the side separately from the reinforcing bracket (33). Can be.

The cylinder member 36 is provided on the upper side of the installation block 34 is in contact with the bottom surface of the seating portion (22). The cylinder shaft of the cylinder member 36 is in contact with the bottom surface of the seating portion 22 to be pushed upward.

At this time, the bottom of the seating portion 22 is formed with a groove portion can prevent the cylinder shaft of the cylinder member 36 from being separated.

The control unit 40 is configured to control each lifting unit 30 to raise and lower the generator 16 evenly by raising and lowering to the same height. Each lifting unit 30 is provided with two cylinder members 36 so as to control all four cylinder members 36.

5 is a state diagram of separating the upper case assembly of the gas turbine in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention, Figure 6 is a generator rotor of the complex power plant according to an embodiment of the present invention Figure 7 is a state diagram of removing the flange in the shaft extraction method, Figure 7 is a state diagram for installing and lifting the lifting device 100 to the generator in the generator rotor shaft extraction method of the combined cycle power plant according to an embodiment of the present invention, Figure 8 FIG. 9 is a state diagram in which a lifting member is applied to a rotor shaft in a method of extracting a generator rotor shaft of a complex power generation facility according to an embodiment of the present invention, and FIG. 9 is a method of extracting a generator rotor shaft of a complex power generation facility according to an embodiment of the present invention. Figure 10 is a state diagram for drawing a portion of the rotor shaft, Figure 10 is the lifting in the center of the rotor shaft in the generator rotor shaft withdrawal method of the combined cycle power plant according to an embodiment of the present invention The state diagram for transferring the material to give walking. 11 is a flow chart showing a generator rotor shaft withdrawal process of the combined cycle power plant according to an embodiment of the present invention.

With reference to Figures 2 to 11, look at the generator rotor shaft withdrawal method of the combined cycle power plant using the lifting device 100 according to an embodiment of the present invention.

In the uniaxial hybrid power generation system according to the present invention, a gas turbine 12 including an upper casing assembly 122 and a lower casing assembly 124, a generator 16, and a steam turbine 14 are arranged in a line to form a gas turbine. Heat the boiler by using the heat of the exhaust gas discharged from the (12), and supply the steam heated in the boiler to the steam turbine 14 through the pipeline to produce electricity by turning the rotor shaft 18 of the generator 16 do.

At this time, the rotor shaft 18 of the generator 16 is connected to the gas turbine 12 shaft 13 and the steam turbine 14 shaft 15 through coupling of the

flanges

17 and 19 to receive power. .

As such, in the uniaxial hybrid power generation facility, the generator 16 is an important facility to be managed intensively, and after a long time of use, the rotor shaft 8 of the generator 16 should be taken out to maintain the main part of the rotor shaft 18. .

Therefore, in order to pull out the rotor shaft 18 from the generator 16, the following drawing method is applied.

5 and 11, "S10" separates the upper casing assembly 122 from the lower casing assembly 124 in the gas turbine 12 to form the moving space part 126 in the gas turbine 12. It's a step.

The upper casing assembly 122 and the lower casing assembly 124 may be fixed to each other by screwing through a flange coupling.

The moving space 126 is a free space required to prevent the latch when the rotor shaft 18 moves to the right.

Referring to FIGS. 6 and 11, "S20" denotes a shaft 13 of the gas turbine 12 and a rotor shaft of the generator 16 coupled to the shaft 15 of the steam turbine 14 and the

flanges

17 and 19. It is a step of separating each of (18).

For this reason, the rotor shaft 18 is in the state which can be taken out, without the part which catches on the left-right side. However, since the heights of the lower casing assembly 124 and the steam turbine 14 of the generator 16 and the gas turbine 12 are the same, it is difficult to pull out the side of the rotor shaft 16.

In order to solve this, a process of lifting the generator 16 is necessary.

Referring to FIGS. 7 and 11, "S30" is a step of installing the lifting device 100 in the generator 16 and lifting the generator 16 using the lifting device 100.

Lifting device installation and generator lifting step (S30), the step of mounting the support frame 24 having a seating portion 22 using the coupling member 26 on both sides of the generator 16 (S32), and seating Arranging the lifting unit 30 at the lower portion of the unit 22 (S34), and driving the cylinder member 36 to lift the generator 16 through the seating unit 22 (S36); Include.

Here, four cylinder members 36 are provided, all of which are two on one side of the generator. Therefore, the four cylinder members 36 are operated by the same length of the four shafts under the control of the control unit 40 so that the generator 16 is elevated to a uniform height.

In this case, the lifting unit 30 is provided on the bottom plate 32 placed on the floor, the installation block 34 provided on the bottom plate 32 and extending upward, and the installation block 34 above. It comprises a cylinder member 36 in contact with the bottom of the seating portion 22.

Lifting device installation and generator lifting step (S30), lifting device 100 is preferably lift the generator 16 above the height capable of withdrawing the rotor shaft 18 through the moving space 126.

Referring to FIGS. 8 and 11, "S40" uses the lifting member 52 connected to the ceiling crane 50 at the end of the rotor shaft 18 exposed in the direction of the gas turbine 12 from the generator 16. It is a step to walk.

The lifting member 52 may use at least one of a steel chain, a steel wire, or a thick rope.

9 and 11, "S50" slides the ceiling crane 50 through the guide rail 54 and pulls the rotor shaft 18 toward the moving space 126 by the lifting member 52. A part of the rotor shaft 18 is taken out.

At this time, in the step S50 of drawing out a part of the rotor shaft, the lifting member 52 may draw 60 to 70% of the entire length of the rotor shaft 18.

The reason is that when the rotor shaft 18 is completely pulled out using the lifting member 52, the other end of the rotor shaft 18 is supported because the lifting member 52 is caught only at one end of the rotor shaft 18. There is no part that can be lowered down. In addition, when the rotor shaft 18 is pulled out by 50% or less by the lifting member 52, there is a disadvantage in that the center of the rotor shaft 18 cannot be hooked to the lifting member 52.

9 and 11, "S60" is a step performed after the step S50 of drawing out a part of the rotor shaft to support the bottom of the rotor shaft 18 by using at least one support member 60. Step.

The brace member 60 is a long brace member 62 provided close to the lifting member 52 in the rotor shaft 18, and the insertion hole of the stator 162 of the generator 16 in the rotor shaft 18 ( And a supporting member 64 having a short length to be provided at 164.

On the upper side of the

support members

62 and 64, a seating groove 66 is formed to match the curvature of the rotor shaft 18.

The mounting shaft 66 prevents the rotor shaft 18 from being separated from the

support members

62 and 64. Bracing

members

62 and 64 are formed to be widened toward the lower side to enable stable support.

Referring to FIGS. 10 and 11, "S70" is a step of walking the central portion of the rotor shaft 18 to the lifting member 52 and drawing out the entire rotor shaft 18 to move it.

At this time, the lifting member 52 is stably supporting the rotor shaft 18 at two places while being spread in two lines, and may be configured to be connected in one line while being retracted upward.

A protective pad 56 for protecting the surface of the rotor shaft 18 may be provided between the lifting member 52 and the rotor shaft 18. The protective pad 56 may apply various protective plates such as a wooden board, a synthetic resin board, a rubber board, and the like.

The generator rotor shaft withdrawal method of the combined cycle power plant using the lifting device 100 according to the present invention, and the flange connection of the shaft of the generator 16 rotor shaft 18 and the steam turbine 14 and the gas turbine 12 By using the lifting device 100, the generator 16 is lifted up to draw out the rotor shaft, thereby reducing the weight of the equipment and simplifying the drawing process.

In other words, unlike the conventional method, the rotor shaft can be pulled out even if a ceiling crane of less than half of the existing capacity is used without using a large-capacity crane, thereby increasing convenience, simplifying the disassembly process, and reducing the number of parts and the repair cost of the drawing equipment. can do.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

Claims

A pair of support parts provided on both sides of the housing of the generator and provided with a plurality of seating parts;

A lift unit supported on a bottom surface of the seating unit and lifting the generator through the support unit by a lift operation; And

And a control unit for controlling each of the elevating units to elevate to the same height to lift the generator evenly.
The method of claim 1,

The support unit,

A support frame disposed at both sides of the housing of the generator and having the seating portions formed at both edge portions thereof; And

And a coupling member coupling the support frame to the housing of the generator.
The method of claim 2,

The support unit is provided with a bending prevention frame to prevent the deformation of the support frame.
The method of claim 1,

And the seating part is reinforced by a reinforcing frame provided on the seating part.
The method of claim 1,

The lifting unit,

A bottom plate placed on the floor;

An installation block provided on the bottom plate and extending upward; And

And a cylinder member provided on an upper side of the installation block to be in contact with the bottom surface of the seating portion.
The method of claim 5,

Lifting device, characterized in that the installation block is fixed to each other by a connecting member.
In the method for withdrawing the rotor shaft of the generator in a combined power plant is arranged a gas turbine, a generator and a steam turbine comprising an upper casing assembly and a lower casing assembly,

Separating the upper casing assembly from the lower casing assembly to form a moving space in the gas turbine;

Separating the shaft of the gas turbine and the rotor shaft of the generator flanged to the shaft of the steam turbine;

Installing a lifting device on the generator, and elevating the generator using the lifting device;

Hooking the end of the rotor shaft exposed from the generator to the end of the rotor shaft using a lifting member connected to the ceiling crane;

Moving the ceiling crane to draw a portion of the rotor shaft by pulling the rotor shaft toward the moving space part with the lifting member; And

Walking the center of the rotor shaft to a lifting member, and lifting and moving the entire rotor shaft;

Generator rotor shaft withdrawal method of the combined cycle power plant using a lifting device comprising a.
The method of claim 7, wherein

The lifting device installation and generator lifting step,

Mounting support frames having seating portions using coupling members on both sides of the generator;

Disposing a lifting unit below the seating unit; And

Driving a cylinder member to lift the generator through the seat;

Generator rotor shaft withdrawal method of the combined cycle power plant using a lifting device comprising a.
The method of claim 8,

The lifting unit,

A bottom plate placed on the floor;

An installation block provided on the bottom plate and extending upward; And

A cylinder member provided on an upper side of the installation block and in contact with a bottom surface of the seating portion;

Generator rotor shaft withdrawal method of the combined cycle power plant using a lifting device comprising a.
The method of claim 7, wherein

In the lifting device installation and generator lifting step,

And the lifting device lifts the generator above a height capable of withdrawing the rotor shaft through the moving space part.
The method of claim 7, wherein

In the step of drawing out a part of the rotor shaft,

And the lifting member draws 60 to 70% of the total length of the rotor shaft.
The method of claim 7, wherein

After the step of drawing out a part of the rotor shaft,

The method of claim 1, further comprising the step of supporting the bottom surface of the rotor shaft by using at least one support member.