JP2007016599A - Power generation plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the vibration of a steel frame from affecting the equipment of a power generation plant when the steel frame is used for the installation of the equipment of the power generation plant. <P>SOLUTION: This power generation plant 1 in which a gas turbine 20, a steam turbine 21, and a generator 22 are aligned and installed on the steel frame 10 is supported on the ground G by a suspension mechanism 30. The steel frame 10 comprises a lattice structure 11 therein, and a damping mechanism is installed in at least one of unit lattices 12 in the lattice structure. The damping mechanism comprises a dynamic vibration absorber 40 formed of, for example, a mass element 41 and a spring element 42. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power plant that combines power plant equipment such as a gas turbine, a steam turbine, and a generator.

  In installing the power plant equipment at the power plant, the traditional method was to construct the concrete frame after the ground work, and install the power plant equipment on the completed concrete frame to adjust the alignment. This method requires a long period of time for the construction of the concrete mount, and after completion of the concrete mount, it is necessary to install the power plant equipment and adjust the alignment, so it takes a lot of time to complete and the cost is high It becomes.

Therefore, a method was developed in which a steel mount was manufactured at the factory as an alternative to the concrete mount, and power plant equipment was installed on the steel mount, shipped and transported, and installed at the power generation site. According to this method, the construction period can be shortened compared to the construction of a concrete platform at the installation site, and the factory adjusts the alignment of the power plant equipment on the steel platform, and when the adjustment is completed, it is fixed to the steel platform as it is. This is a great deal of work compared to installing and adjusting the alignment locally. Another advantage is that the power plant can be protected from earthquakes if the suspension mechanism of the steel pedestal is seismically isolated. An example of a power plant installation structure using such a steel mount can be seen in Patent Document 1.
Japanese Unexamined Patent Publication No. 2000-9293 (page 3 to page 4, FIGS. 1 to 5)

  Supporting a steel mount with power plant equipment with a suspension mechanism and separating it from the ground makes the power plant more seismically isolated, but another type of problem arises. It is the resonance of a steel mount. If the vibration or seismic motion of the power plant equipment matches the natural frequency of the steel mount, the steel mount will vibrate greatly. This may cause a situation where the alignment of the rotating shaft system of the power plant equipment is broken or the bearing load exceeds an allowable value.

    The present invention has been made in order to solve the above-described problems. In using a steel mount for installing power plant equipment, the vibration of the steel mount should not be affected by the power plant equipment. Objective.

  (1) In order to achieve the above object, the present invention provides a power plant in which a steel mount on which power plant equipment is installed is supported on a ground by a suspension mechanism, and a damping mechanism is provided inside the steel mount. It is characterized by that.

  According to this configuration, even if the vibration or earthquake motion of the power plant equipment coincides with the natural frequency of the steel gantry, the vibration of the steel gantry is suppressed, and the power plant equipment is not adversely affected.

  (2) Further, according to the present invention, in the power plant configured as described above, a lattice structure exists in the steel frame, and the vibration damping mechanism is provided in at least one unit lattice of the lattice structure. It is a feature.

  According to this configuration, the vibration control mechanism can be easily installed using the lattice structure for giving the steel mount the required rigidity. In addition, the damping mechanism can be installed in a pinpoint manner aiming at a particularly vibrated portion of the steel mount.

  (3) Further, the present invention is characterized in that, in the power plant configured as described above, the vibration damping mechanism is configured by a dynamic vibration absorber including a mass element and a spring element.

  According to this configuration, the vibration control mechanism can be easily configured. Further, when vibration in a specific axial direction becomes a problem, this vibration can be reduced by appropriately setting the arrangement direction of the dynamic vibration absorber.

  (4) The present invention is characterized in that, in the power plant configured as described above, the vibration damping mechanism is configured by a dynamic vibration absorber including a mass element, a spring element, and a damping element.

  According to this configuration, it is possible to easily configure a vibration suppression mechanism having a large vibration suppression effect. Further, when vibration in a specific axial direction becomes a problem, this vibration can be reduced by appropriately setting the arrangement direction of the dynamic vibration absorber.

  (5) The present invention is characterized in that, in the power plant configured as described above, the vibration damping mechanism is configured by a vibration absorbing rubber block incorporated in the unit lattice.

  According to this configuration, the vibration control mechanism can be easily configured. The structure is so simple that it is difficult to break down and requires little maintenance.

  (6) In the power plant configured as described above, the vibration control mechanism is configured by an electromagnetic actuator including a coil and an iron core that are attached to the walls of the unit lattice and are relatively displaceable. It is said.

  According to this configuration, the vibration control mechanism can be easily configured. It is also possible to adjust the damping force by increasing or decreasing the coil current.

  (7) The present invention is characterized in that, in the power plant configured as described above, the vibration control mechanism is configured by a vibration control steel plate attached to the wall of the unit lattice.

  According to this configuration, the vibration control mechanism can be easily configured. The structure is so simple that it is difficult to break down and requires little maintenance.

  (8) Further, the present invention is characterized in that, in the power plant configured as described above, the damping mechanism is configured by a friction plate fastened and fixed to the wall of the unit lattice.

  According to this configuration, the vibration control mechanism can be easily configured. The structure is so simple that it is difficult to break down and requires little maintenance.

  (9) Further, according to the present invention, in the power plant configured as described above, the vibration damping mechanism is configured by a liquid container that is mutually attached to the wall of the unit lattice and is relatively displaceable, and a porous solid enclosed therein. It is characterized by that.

  According to this configuration, the vibration can be attenuated by the viscous resistance between the porous solid and the liquid, and the vibration of the steel gantry can be suppressed. Since viscous resistance is generated no matter which direction the liquid flows, a damping effect can be obtained regardless of the direction of vibration.

  According to the present invention, by providing a vibration control mechanism on the steel pedestal itself, it is effective that the alignment of the power plant equipment installed on the steel pedestal collapses due to vibration or a bearing load exceeding the limit occurs. Can be prevented. Further, by utilizing the lattice structure of the steel pedestal, it is possible to easily install a vibration damping mechanism, and it is also possible to dampen a particularly vibrated portion of the steel pedestal.

  FIG. 1 is a schematic configuration diagram of a power plant 1. The power plant 1 is centered on a steel mount 10. A gas turbine 20, a steam turbine 21, and a generator 22 are arranged in series on the steel gantry 10, and the rotating shaft 20 a of the gas turbine 20, the rotating shaft 21 a of the steam turbine 21, and the rotating shaft 22 a of the generator 22. Are connected in order to form one rotating shaft 23. The rotating shaft 23 is supported by a plurality of bearings 24 installed on the upper surface of the steel mount 10. The gas turbine 20, the steam turbine 21, and the generator 22 are aligned at the factory stage and fixed to the steel mount 10. A condenser 25 of the steam turbine 21 is attached to the lower surface of the steel mount 10.

  The steel mount 10 and the condenser 25 are supported on the ground G by the suspension mechanism 30. The suspension mechanism 30 is mainly composed of a plurality of compression coil springs 31 to which a damping mechanism (not shown) is combined.

  A lattice structure 11 as shown in FIG. 2 is formed inside the steel mount 10. The lattice structure 11 is formed by combining a wall extending in the vertical direction and a wall extending in the horizontal direction when viewed from above, and a large number of unit lattices 12 having a planar shape and a predetermined thickness in the vertical direction. The lattice structure 11 can be formed by casting cast steel or by welding thick steel plates. The lattice structure 11 is not limited to the integration of the rectangular unit lattices 12. Other shapes such as a honeycomb shape may also be used.

  A vibration damping mechanism is provided inside the steel mount 10. Hereinafter, embodiments of the vibration damping mechanism will be described with reference to FIG.

  A first embodiment of the vibration damping mechanism is shown in FIG. In the first embodiment, the vibration damper 40 constitutes the vibration damping mechanism. The dynamic vibration absorber 40 includes a mass element 41 having a mass m and a spring element 42 having a dynamic spring constant k. This dynamic vibration absorber 40 is mounted in the unit cell 12 in the portion of the steel gantry 10 where the vibration is large. The number of dynamic vibration absorbers 40 is not limited to one. You can attach as many as you need.

  According to this configuration, the vibration damping mechanism can be easily configured by the known dynamic vibration absorber 40. Further, when vibration in a specific axial direction becomes a problem, it is possible to reduce the vibration by appropriately setting the arrangement direction of the dynamic vibration absorber 40.

  A second embodiment of the vibration damping mechanism is shown in FIG. In the second embodiment, the vibration damper 45 constitutes the vibration damping mechanism. The dynamic vibration absorber 45 is obtained by adding a damping element 46 having a viscous damping coefficient c to the dynamic vibration absorber 40 of the first embodiment. Due to the presence of the damping element 46, the dynamic vibration absorber 45 has a vibration damping capacity higher than that of the dynamic vibration absorber 40. As in the case of the dynamic vibration absorber 40, the dynamic vibration absorber 45 is attached in a necessary number in a necessary place.

  According to this configuration, it is possible to easily configure a vibration damping mechanism having a large vibration damping effect by the known dynamic vibration absorber 45. Further, when vibration in a specific axial direction becomes a problem, it is possible to reduce the vibration by appropriately setting the arrangement direction of the dynamic vibration absorber 45.

  FIG. 5 shows a third embodiment of the vibration damping mechanism. In the third embodiment, the vibration damping mechanism is constituted by a vibration-absorbing rubber block 50 incorporated in the unit lattice 12. The vibration-absorbing rubber block 50 has a shape that fills the inside of the unit cell 12, and absorbs or attenuates vibration transmitted from the unit cell 12 to control vibration.

  According to this configuration, the vibration damping mechanism can be easily configured by a simple component called the vibration absorbing rubber block 50. The structure is so simple that it is difficult to break down and requires little maintenance.

  A fourth embodiment of the vibration damping mechanism is shown in FIG. In the fourth embodiment, the electromagnetic actuator 55 constitutes the vibration damping mechanism. The electromagnetic actuator 55 is a coil 56 attached to one wall of the unit cell 12 and an iron core 58 attached to the other wall of the unit cell 12 via a spring element 57. The iron core 58 is inserted into the coil 56 so as to be capable of relative displacement. When the coil 56 and the iron core 58 are moved relative to each other while the coil 56 is energized, resistance due to electromagnetic force is added. A damping force can be obtained by this resistance.

  According to this configuration, the vibration control mechanism can be easily configured. It is also possible to adjust the damping force by increasing or decreasing the current flowing through the coil 56.

  FIG. 7 shows a fifth embodiment of the vibration damping mechanism. In the fifth embodiment, it is the damping steel plate 60 attached to the wall of the unit lattice 12 that constitutes the damping mechanism. A pair of damping steel plates 60 are arranged so as to sandwich the wall of the unit grid 12, and each damping steel plate 60 absorbs or attenuates vibration transmitted from the unit grid 12 to perform damping. The damping steel plate 60 can be attached using a fastening element such as a bolt or a rivet, or may be attached using an adhesive.

  According to this configuration, the vibration damping mechanism can be easily configured by a simple component called the vibration-damping steel plate 60. The structure is so simple that it is difficult to break down and requires little maintenance.

  A sixth embodiment of the vibration damping mechanism is shown in FIGS. In the sixth embodiment, the vibration damping mechanism is constituted by a friction plate 65 that is fastened and fixed to the wall of the unit lattice 12 with a predetermined fastening force. A pair of friction plates 65 are arranged so as to sandwich the wall of the unit lattice 12, and are fastened and fixed using bolts 66, nuts 67, and washers 68. When the gantry 10 vibrates, a slip occurs between the wall of the unit cell 12 and the friction plate 65. At this time, the vibration is attenuated by the friction between the wall of the unit cell 12 and the friction plate 65, and a damping effect is produced.

  According to this configuration, the vibration damping mechanism can be easily configured with simple components such as the friction plate 65 and the fastening means. The structure is so simple that it is difficult to break down and requires little maintenance. If the friction plate 65 is made of a damping steel plate, both the damping characteristics of the damping steel plate itself and the damping effect due to friction work, and a stronger damping effect can be obtained.

  FIG. 10 shows a seventh embodiment of the vibration damping mechanism. In the seventh embodiment, the vibration control mechanism is constituted by a liquid container 70 and a porous solid 71 contained therein. The liquid container 70 is attached to the wall of the unit cell 12 via the stay 72, and the porous solid 71 is attached to the wall of the unit cell 12 via the stay 73. The porous solid 71 is drawn in a cubic shape in the figure, but the shape is not limited, and may be, for example, a sphere. The same applies to the shape of the liquid container 70. The holes 74 of the porous solid 71 are connected to each other like an open cell foam, and the liquid 75 in the liquid container 70 passes through the holes. The stay 73 and the liquid container 70 are connected by a bellows-shaped rubber boot 76 so that the liquid container 70 and the porous solid 71 can be relatively moved and the liquid 75 is prevented from leaking.

  When the steel mount 10 vibrates, a relative movement occurs between the liquid container 70 and the porous solid 71. Along with this, the liquid 75 flows in the hole 74. However, since the hole 74 is small and the flow path is complicated, a viscous resistance acts on the flow, and this viscous resistance acts as a damping force. Since viscous resistance is generated no matter which direction the liquid 75 flows, a damping effect can be obtained regardless of the direction of vibration.

  Depending on the direction of relative movement between the liquid container 70 and the porous solid 71, the rubber boot 76 expands and contracts, and the internal volume of the liquid container 70 changes. In order to cope with this problem, for example, a bladder capsule 77 in which air is sealed in an elastic rubber bag is placed in the liquid container 70, or a part of the liquid 75 is simply replaced with gas. Good.

  It is also possible to perform vibration suppression between the steel mount 10 and the building that houses it without providing a vibration control mechanism inside the steel mount 10 as in the above embodiments. An example is shown in FIG. 11 includes an acceleration sensor 80, and a plurality of cylinders 81 are arranged around the acceleration sensor 80. When the acceleration sensor 80 detects that vibration exceeding the allowable value has occurred in the steel mount 10, the plunger 82 protrudes from the cylinder 81 and hits the wall 83 of the building. The friction between the plunger 82 and the wall 83 becomes a damping force, and the vibration of the steel gantry 10 is suppressed. The plunger 82 can be protruded from the cylinder 81 by any of hydraulic pressure, pneumatic pressure, electromagnetic force, and spring force.

    While the embodiments of the present invention have been described above, various modifications can be made without departing from the spirit of the invention. In addition, since the embodiments of the present invention are not mutually exclusive, there is no problem even if the vibration control mechanisms of a plurality of embodiments are provided for one steel mount.

    The present invention is widely applicable to power plants configured to install equipment on a steel mount.

Schematic configuration diagram of power plant Partial perspective view of internal structure of steel mount Schematic configuration diagram of the first embodiment of the vibration damping mechanism Schematic configuration diagram of second embodiment of vibration damping mechanism Third schematic diagram of vibration control mechanism Schematic configuration diagram of the fourth embodiment of the vibration damping mechanism Schematic configuration diagram of fifth embodiment of vibration damping mechanism Schematic configuration diagram of sixth embodiment of vibration damping mechanism A direction arrow view of FIG. Schematic configuration diagram of seventh embodiment of vibration damping mechanism Schematic configuration diagram showing steel frame vibration control means by different approaches

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power generation plant 10 Steel mount frame 11 Grid structure 12 Unit lattice 20 Gas turbine 21 Steam turbine 22 Generator 25 Condenser 30 Suspension mechanism 40, 45 Dynamic vibration absorber 50 Damping rubber block 55 Electromagnetic actuator 60 Damping steel plate 65 Friction plate 70 Liquid container 71

Claims (9)

In a power plant in which a steel mount on which power plant equipment is installed is supported by a suspension mechanism on the ground,
A power plant, wherein a vibration damping mechanism is provided inside the steel mount.   The power plant according to claim 1, wherein a lattice structure exists in the steel frame, and the damping mechanism is provided in at least one unit lattice of the lattice structure.   The power plant according to claim 2, wherein the vibration damping mechanism is configured by a dynamic vibration absorber including a mass element and a spring element.   The power plant according to claim 2, wherein the vibration damping mechanism is configured by a dynamic vibration absorber including a mass element, a spring element, and a damping element.   The power generation plant according to claim 2, wherein the vibration damping mechanism is configured by a vibration absorbing rubber block incorporated in the unit lattice.   The power generation plant according to claim 2, wherein the vibration control mechanism is configured by an electromagnetic actuator having a coil and an iron core that are attached to the wall of the unit lattice and are capable of relative displacement.   The power plant according to claim 2, wherein the damping mechanism is configured by a damping steel plate attached to a wall of the unit lattice.   The power plant according to claim 2, wherein the vibration control mechanism is configured by a friction plate fastened and fixed to a wall of the unit lattice.   3. The power plant according to claim 2, wherein the vibration control mechanism is configured by a liquid container that is attached to the wall of the unit lattice and is relatively displaceable, and a porous solid enclosed therein.

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