JP7234330B1 - ROTOR ROTATING DEVICE FOR POWER PLANT AND ROTOR ROTATING METHOD FOR POWER PLANT - Google Patents

Abstract

A power plant rotor rotation device and a power plant rotor rotation method capable of easily rotating a rotor such as a turbine rotor in a power plant are provided. A device for rotating a rotor of a turbine or generator provided in a power plant, comprising a dovetail groove having one or a plurality of teeth provided along the circumferential direction of the rotor. a plurality of temporary gears that can be attached to balance weight mounting grooves via notches for inserting balance weights; one or more teeth; and a balance weight mounting groove that can be inserted into the notches. a stop gear having an immovable rotation stop portion therein and fixed by inserting the rotation stop portion into the notch portion in a state in which the temporary gear is arranged in the balance weight mounting groove; equipped. [Selection drawing] Fig. 8

Description

TECHNICAL FIELD Embodiments of the present invention relate to a power plant rotor rotation device and a power plant rotor rotation method.

In general, turbines and generator rotors such as gas turbine rotors in thermal power plants are installed in the vehicle interior for centering adjustment in installation work and periodic inspection work, replacement of rotor blades, and inspection work. Therefore, it is necessary to rotate the rotor alone. This rotor rotation work is generally carried out by using a turning device provided as a power train or by inserting temporary bolts into the end of the coupling at the tip of the rotor to apply rotational power.

In order to use the turning device for the above-described rotor rotation work, it is necessary to temporarily assemble the device itself. Additional work is required to temporarily join the coupling portions of a plurality of rotors positioned between the rotor to be rotated and the turning device.

In general, to rotate the rotor during installation work or periodic inspection work, a temporary bolt is inserted into the end of the coupling with another rotor, and rotational power is applied using an overhead crane or hydraulic jack to rotate the rotor. Since the end of the coupling with another rotor is generally inside the bearing stand, it may be difficult to use temporary bolts when another adjacent rotor is already installed in the vehicle compartment. Further, even if temporary bolts can be used, continuous rotation is difficult.

These ancillary works are delaying the construction process and impairing the flexibility of schedule planning and work. Therefore, in installation work and periodic inspection work, there is a need for a method of rotating the rotor alone without using the provided turning device and without attaching a temporary object to the end face of the coupling inside the bearing stand.

In particular, in the gas turbine rotor, the load coupling shaft is the only part that applies rotational power to the gas turbine rotor when it is installed in the vehicle compartment. In such a case, it has been difficult to stably rotate the gas turbine rotor by using a drive roller or a sling belt to apply rotational power to the load coupling shaft due to insufficient frictional force.

Conventionally, the following techniques have been disclosed for mounting this temporary gear for rotation. One of them is a technology in which a sprocket gear is attached to the shaft joint of the turbine rotor, and a driving hydraulic motor is used as a power source to rotate the sprocket gear via a roller chain and simultaneously rotate the turbine rotor. is. Another technique is to detachably attach a ratchet plate having a gear on the outer periphery to the turbine rotor shaft coupling, and drive a drive plate having a plurality of teeth that mesh with the gear with a hydraulic cylinder to rotate the rotor. .

Utility Model Registration No. 3057273 JP-A-2000-337105

However, in the conventional technology described above, a temporary gear is attached to the shaft coupling (coupling end flange), and the shaft coupling is housed inside the bearing stand when the turbine rotor is assembled in the vehicle interior. Therefore, it is necessary to open the upper half of the bearing stand, and the supply of oil to the bearings, which is necessary when the turbine rotor rotates, is restricted. In addition, the space between the lower half bearing base wall surface and the coupling end flange is so narrow that it may not be possible to mount or fix these gears.

The present invention has been made in response to the above-described conventional circumstances, and an object of the present invention is to provide a rotor rotation device for a power plant and a rotor rotation device for a power plant that can easily rotate a rotor such as a turbine rotor in a power plant. It is to provide a method.

A rotor rotating device for a power plant according to an embodiment is a device for rotating a rotor of a turbine or generator provided in a power plant, and has one or a plurality of teeth, along the circumferential direction of the rotor. a plurality of temporary gears that can be attached to the dovetail balance weight mounting groove through a notch for inserting the balance weight, one or more teeth, and can be inserted into the notch; In addition, a non-movable rotation stopper is provided in the balance weight mounting groove, and the rotation stopper is inserted into the notch and fixed in a state in which the temporary gear is arranged in the balance weight mounting groove. and a stop gear.

A rotor rotation method for a power plant according to an embodiment is a method for rotating a rotor of a turbine or a generator provided in a power plant, which has one or more teeth and is provided along the circumferential direction of the rotor. A plurality of temporary gears that can be attached to the dovetail-shaped balance weight attachment groove via notches for inserting the balance weight are disposed in the balance weight attachment groove, and one or more teeth and the a rotation stopper that can be inserted into the notch and is immovable in the balance weight mounting groove, wherein the rotation stopper is cut while the temporary gear is arranged in the balance weight mounting groove; A stop gear that is inserted into and fixed to the notch is disposed in the notch, and rotational power is applied to the rotor via the temporary gear and the stop gear.

ADVANTAGE OF THE INVENTION According to this invention, the rotor rotation apparatus of a power plant and the rotor rotation method of a power plant which can rotate rotors, such as a turbine rotor, in a power plant simply can be provided.

1 is a diagram showing a configuration example of a power plant to which an embodiment is applied; FIG. The figure which shows the other structural example of the electric power generation plan to which embodiment is applied. The figure which shows the structure of load coupling. FIG. 4 is a diagram showing the configuration of a balance weight attached to a load coupling; FIG. 4 is a diagram showing a mounting structure of a balance weight with respect to a load coupling; The figure which shows the structure of the temporary gear which concerns on embodiment. The figure which shows the structure of the temporary gear which concerns on embodiment. The figure which shows the structure of the stop gear which concerns on embodiment. The figure which shows the structure of the stop gear which concerns on embodiment. The figure which shows the structure of the bridge gear which concerns on embodiment. The figure which shows the structure of the bridge gear which concerns on embodiment. The figure which shows the structure of the bridge gear which concerns on embodiment.

Hereinafter, a rotor rotating device for a power plant and a rotor rotating method for a power plant according to an embodiment will be described with reference to the drawings.

1 and 2 are diagrams showing an example of a schematic configuration of a power plant to which a power plant rotor rotating device and a power plant rotor rotating method according to an embodiment are applied.

In the power plant shown in FIG. 1, a gas turbine (GT) 101, a generator (GEN) 102, a steam turbine (ST) 103, and a steam turbine (ST (LP)) 104 are arranged in order from the left side of the drawing. . A load coupling 110 is provided between the gas turbine (GT) 101 and the generator (GEN) 102 to connect them. In addition, between each device, as indicated by a dotted line in the drawing, a coupling end 111 is provided where these couplings are performed. In FIG. 1, 112 denotes a turning device for rotating the rotor.

Also, FIG. 2 shows a configuration example of another power plant, and parts corresponding to those in FIG. 1 are denoted by the same reference numerals. In the power plant shown in FIG. 2, a gas turbine (GT) 101, a steam turbine (ST) 103, a steam turbine (ST (LP)) 104, and a generator (GEN) 102 are arranged in order from the left side of the drawing. ing. FIG. 2 schematically shows the inside 113 of the bearing pedestal at the coupling end 111 between the load coupling 110 and the steam turbine (ST) 103 . In this case, in order to rotate the load coupling 110, if a temporary bolt 114 is provided at the coupling end (flange 121), it may interfere with the rotor flange of the adjacent steam turbine (ST) 103 or the like.

Next, the configuration of load coupling 110 will be described with reference to FIGS. The load coupling 110 is a joint shaft positioned between a gas turbine rotor and other rotors, and has coupling ends (flanges) 121 at both ends of the shaft, as shown in FIG.

In the middle of the shaft, a dovetail groove is formed on the circumference so that a balance weight 130 for suppressing vibration during turbine operation can be attached. A groove 122 is dug. The balance weight mounting groove 122 has notches 123 for inserting balance weights at two diagonal positions (every 180°) or four positions (every 90°) on the circumference. The balance weight mounting groove 122 generally has a dovetail shape, that is, has a flask-shaped cross section (convex groove) so that the balance weight 130 does not scatter due to centrifugal force. The balance weight 130 can be inserted only through a notch 123 for balance weight insertion that is wider than the width of the bottom of the balance weight 130 (see FIG. 5). The balance weight mounting groove 122 has a width of approximately 25 mm and a depth of approximately 20 mm, for example.

After the balance weight 130 is inserted through the notch 123 , it can be arranged along the balance weight mounting groove 122 at any position on the circumference. be. The balance weight fixing screw 131 is a hexagonal socket straight screw that is screwed into a threaded hole 132 provided through the center of the balance weight 130 toward the radial center of the shaft of the load coupling 110 . When the tip of the fixing screw 131 reaches the bottom of the balance weight mounting groove 122 , the balance weight 130 moves radially outward (opposite to the direction in which the screw advances) to open the balance weight mounting groove 122 in the radial direction (opening). It is fixed by coming into contact with the inner wall surface of the part side).

Here, conditions of the gas turbine rotor at the time of inspection of the gas turbine 101 in the power plant shown in FIG. 1 will be described. When it becomes necessary to rotate the gas turbine rotor during a periodic inspection or the like, the coupling end 111 between the load coupling 110 attached to the gas turbine rotor and the other adjacent rotor is removed for centering adjustment of the gas turbine. disconnected for maintenance.

Next, a rotor rotating device for a power plant and a rotor rotating method for a power plant according to the embodiment will be described. In the following description, the load coupling 110 having notches 123 for inserting balance weights at two diagonal positions (every 180°) on the circumference will be described as an example. A temporary gear 140 is attached along the balance weight attachment groove 122 positioned in the middle of the load coupling 110 to apply rotational power to the shaft of the load coupling 110 to rotate the gas turbine rotor.

As shown in FIGS. 6 and 7, the temporary gear 140 has a single structure having one or two teeth 142, and the number corresponding to the length of, for example, about 340° with respect to the circumference. The entire gear is constructed by combining them, and is mounted along the balance weight mounting groove 122 . The temporary gear 140 has a rectangular plate-shaped temporary gear base 141 that abuts on the shaft of the load coupling 110 and is disposed so as to straddle the balance weight mounting groove 122 . It has protruding teeth 142 and a gear back fixing seat 143 arranged in the balance weight mounting groove 122 . A screw hole 144 for fixing a gear back surface fixing seat 143 is provided at approximately the center of the teeth 142 and the temporary gear seat 141 . Also, the temporary gear base 141 is provided with two screw holes 145 so as to be positioned on both sides of the tooth 142 .

The gear back fixing seat 143 for fixing the temporary gear 140 to the shaft of the load coupling 110 has the same shape and structure as the balance weight 130 described above, and the normal balance weight 130 can be used instead. can. Then, as shown in FIG. 6, the gear back surface fixing seat 143 is temporarily fixed to the tooth 142 and the temporary gear seat 141 with a fixing screw 146 (for example, a straight screw with a hexagon socket). 122, and slide it in the balance weight mounting groove 122 to place it in a predetermined position, and then tighten the fixing screw 146. As shown in FIG. In this case as well, as shown in FIG. 7, when the tip of the fixing screw 146 reaches the bottom of the balance weight mounting groove 122, the gear back fixing seat 143 moves radially outward (opposite to the direction in which the screw advances). Then, it is fixed by coming into contact with the inner wall surface in the radial direction (opening side) of the balance weight mounting groove 122 . The teeth 142 of the temporary gear 140 have a width of, for example, approximately 70 to 80 mm, a peak width of approximately 15 to 25 mm, and a root width of approximately 15 to 25 mm.

In addition, in order to prevent the temporary gear 140 from being displaced in the circumferential direction of the shaft of the load coupling 110 due to rotational power, a stop gear 150 is arranged in the notch portion 123 as shown in FIGS. be. The stop gear 150 includes a rectangular plate-shaped stop gear base 151 and one or two teeth 152 (two in the example shown in FIGS. 8 and 9) projecting outward from the stop gear base 151. For example, it has a circumferential length of about 20° on the shaft of the load coupling 110, and by providing it at two locations, it has a length of 40°, and the temporary gear 140 has a length of 320°. The lengths of the two are closely attached without any gaps, and integrated in a 360° ring state.

The back surface of the stop gear 150 has a monoblock structure having a rotation prevention key 153 as a rotation stopper having the same shape as the notch 123 for inserting the balance weight. The stop gear pedestal 151 is provided with one central screw hole 154 so as to be positioned on both sides of the tooth 152 , and similar to the temporary gear 140 , the balance weight mounting groove 122 is mounted using the gear back fixing seat 143 . fixed to Rotational power given to the temporary gear 140 and the stop gear 150 by the frictional force due to the tightening of the gear back fixing seat 143 and the engagement of the anti-rotation key 153 in the notch 123 for inserting the balance weight is applied to the load coupling. It is transmitted directly to the shaft of 110, making it possible to rotate the gas turbine rotor. Rotational power is provided by an electric motor having a required torque from various conditions such as the weight of the gas turbine through a chain matched to the temporary gear 140 and stop gear 150 . Also, the temporary gear 140, stop gear 150, and bridge gear 160, which will be described later, are made of a material, such as stainless steel, having a strength capable of withstanding the torque required by the electric motor at this time.

As described above, in this embodiment, it is possible to use a generally used chain-driven rotating device, and the gas turbine rotor can be independently rotated continuously at a certain rotational speed. .

If there is an existing balance weight 130 in the balance weight mounting groove 122, a bridge gear 160 is used to avoid the balance weight 130. - 特許庁As shown in FIGS. 10 and 11, the bridge gear 160 includes a rectangular plate-shaped bridge gear pedestal 161 which abuts on the shaft of the load coupling 110 and is disposed so as to straddle the balance weight mounting groove 122. It has one or two teeth 162 protruding outward from the bridge gear base 161, and fixing plates 163 provided on both sides of the teeth 162 for fixing the adjacent temporary gears 140. . The fixing plate 163 is also provided with a fixing screw hole 164 for screwing with the adjacent temporary gear 140 .

As shown in FIG. 12, the bridge gear 160 is radially fixed with screws through the screw holes 145 and fixing screw holes 164 provided in the temporary gear base 141 of the adjacent temporary gear 140 . In the circumferential direction, as with the temporary gears 140, it is fixed by closely contacting the adjacent temporary gears 140 and receives the rotational force. The bridge gear 160 selectively uses one tooth and two teeth according to the spread angle of the existing balance weight 130 in the circumferential direction, and inserts the balance weight above and below the existing balance weight 130 without removing the balance weight 130. - 特許庁The temporary gear 140 is inserted from the cutout portion 123 for the balance weight 130 so as to sandwich the temporary gear 140 .

After installing the temporary gears 140 (bridge gears 160 depending on the existing balance weights 130) in the left and right circumferential directions sandwiching the center of the shaft of the load coupling 110 by the above procedure, the gears are rotated from the notches 123 for inserting the balance weights. The prevention key 153 is inserted, and the stop gear 150 is fixed to the temporary gear pedestals 141 of the temporary gears 140 arranged on both sides with screws through the screw holes 154 provided at both ends of the stop gear 150 at a total of four locations. The stop gear 150 is attached to two notches 123 for balance weight insertion on the upper and lower portions of the shaft of the load coupling 110 . Similarly, for shafts having three or more notches 123, stop gears 150 are used according to the number.

As described above, according to the present embodiment, by applying rotational power to the balance weight mounting portion attached to the rotor shaft, the rotor itself can be assembled without using temporary bolts at the end of the coupling inside the bearing stand or temporary assembly of the turning device. rotation can be realized. In addition, by enabling the stable rotation of the gas turbine rotor alone, which was difficult under the condition that the rotor other than the adjacent gas turbine is already inserted in the cabin, it is possible to dismantle other turbines and generators. The gas turbine rotor can be rotated independently regardless of assembly conditions. As a result, the degree of freedom in planning the entire process, such as regular inspections, is improved. In addition, since temporary restoration of the turning gear, opening of the bearing stand, and temporary coupling of rotors other than the gas turbine are unnecessary, it is possible to suppress process delays and cost increases due to backtracking work. In addition, when actually driving, gears such as the temporary gear 140 are removed.

Although several embodiments of the invention have been described above, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

101... gas turbine, 102... generator, 103... steam turbine, 104... steam turbine, 110... load coupling, 111... coupling end, 113... inside of bearing stand, 114... provisional Bolt 121 Coupling end (flange) 122 Balance weight mounting groove 123 Notch 130 Balance weight 131 Fixing screw (straight screw with hexagonal hole) 132 Screw hole 140 Temporary gear 141 Temporary gear base 142 Teeth 143 Gear back fixing seat 144 Screw hole 145 Screw hole 146 Fixing screw (hexagonal hole straight screw), 150... stop gear, 151... stop gear base, 152... tooth, 153... rotation prevention key, 154... screw hole, 160... bridge gear, 161... bridge gear base, 162 …… teeth, 163 …… fixed plate, 164 …… screw holes.

Claims (10)

A device for rotating a rotor of a turbine or generator provided in a power plant,
A plurality of temporary gears having one or more teeth and capable of being attached to dovetail-shaped balance weight attachment grooves provided along the circumferential direction of the rotor via notches for inserting the balance weights. and,
A state in which the temporary gear is arranged in the balance weight mounting groove, and has one or more teeth and a rotation stopper that can be inserted into the notch and is immovable in the balance weight mounting groove. a stop gear fixed by inserting the rotation stop portion into the notch portion;
A rotor rotating device for a power plant, comprising: A rotor rotating device for a power plant according to claim 1,
The temporary gear has a plate-like temporary gear pedestal that straddles the balance weight mounting groove and abuts against the surface of the rotor,
The one or more teeth are arranged to extend outward from the outer surface of the temporary gear base,
A gear back fixing seat is arranged so as to be positioned below the temporary gear seat,
The gear back surface is secured by a screw that is screwed so as to penetrate the temporary gear base and the gear back surface fixing seat, and whose tip portion is in contact with the bottom portion of the balance weight mounting groove. A rotor rotating device for a power plant, characterized in that the stationary seat is fixed. A rotor rotating device for a power plant according to claim 2,
The gear back fixing seat has a cross-sectional shape similar to the cross-sectional shape along the axial direction of the balance weight mounting groove, and is moved toward the opening side of the balance weight mounting groove by tightening the screw. A rotor rotating device for a power plant, characterized by being abutted and supported by an inner surface on the inlet side of a weight mounting groove. A rotor rotating device for a power plant according to claim 2 or 3,
The stop gear is
a plate-like stop gear pedestal that abuts on the surface of the rotor across the balance weight mounting groove;
the one or more teeth are arranged to extend outward from the outer surface of the stop gear seat;
A rotor rotating device for a power plant, wherein the rotation stopping portion is arranged so as to be positioned below the stop gear pedestal. A rotor rotating device for a power plant according to any one of claims 1 to 4,
A rotor rotating device for a power plant, comprising: a bridge gear that straddles the upper portion of the balance weight attached to the balance weight attachment groove and is fixed to the adjacent temporary gear. A method for rotating a rotor of a turbine or generator provided in a power plant, comprising:
A plurality of temporary gears having one or more teeth and capable of being attached to dovetail-shaped balance weight attachment grooves provided along the circumferential direction of the rotor via notches for inserting the balance weights. is arranged in the balance weight mounting groove,
A state in which the temporary gear is arranged in the balance weight mounting groove, and has one or more teeth and a rotation stopper that can be inserted into the notch and is immovable in the balance weight mounting groove. a stop gear fixed by inserting the rotation stop portion into the notch portion is disposed in the notch portion;
A method for rotating a rotor of a power plant, comprising applying rotational power to the rotor via the temporary gear and the stop gear. A rotor rotation method for a power plant according to claim 6,
The temporary gear has a plate-like temporary gear pedestal that straddles the balance weight mounting groove and abuts against the surface of the rotor,
The one or more teeth are arranged to extend outward from the outer surface of the temporary gear base,
A gear back fixing seat is arranged so as to be positioned below the temporary gear seat,
The gear back surface is secured by a screw that is screwed so as to penetrate the temporary gear base and the gear back surface fixing seat, and whose tip portion is in contact with the bottom portion of the balance weight mounting groove. A method for rotating a rotor in a power plant, characterized in that the fixed seat is fixed. A rotor rotation method for a power plant according to claim 7,
The gear back fixing seat has a cross-sectional shape similar to the cross-sectional shape along the axial direction of the balance weight mounting groove, and is moved toward the opening side of the balance weight mounting groove by tightening the screw. A method for rotating a rotor of a power plant, characterized in that the rotor is supported by being brought into contact with the inner surface of the inlet side of the weight mounting groove. A power plant rotor rotation method according to claim 7 or 8,
The stop gear is
a plate-like stop gear pedestal that abuts on the surface of the rotor across the balance weight mounting groove;
the one or more teeth are arranged to extend outward from the outer surface of the stop gear seat;
The rotor rotation method for a power plant, wherein the rotation stopping portion is arranged so as to be positioned below the stop gear pedestal.
A power plant rotor rotation method according to any one of claims 6 to 9,
A rotor rotation method for a power plant, comprising further disposing a bridge gear that straddles an upper portion of the balance weight attached to the balance weight attachment groove and is fixed to the adjacent temporary gear.

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