JP4191322B2 - Steam turbine plant installation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a turbine generator alignment method that takes into account the condenser installation structure and the thermal expansion of the condenser in a steam turbine plant.To the lawRelated.
[0002]
[Prior art and problems to be solved by the invention]
  FIG. 3 is a schematic side view showing an example of a steam turbine and a generator driven by the steam turbine (hereinafter referred to as a turbine generator).
[0003]
  The turbine generator shown in FIG. 3 is a tandem low-pressure four-flow reheat turbine. In FIG. 3, 2 is a high-pressure turbine, 3 is a medium-pressure turbine, 4 is a first low-pressure turbine, 5 is a second low-pressure turbine, 6 Is a generator and 10 is a condenser. Reference numeral 61 denotes a high-pressure turbine shaft that is a rotation shaft of the high-pressure turbine 2, 62 denotes a medium-pressure turbine shaft that is a rotation shaft of the intermediate-pressure turbine 3, and 63 a and 63 b denote rotation shafts of the first low-pressure turbine 4 and the second low-pressure turbine 5. A certain low-pressure turbine shaft 64 is a generator shaft that is a rotating shaft of the generator 6, and these shafts are connected in a skewer shape to constitute a tandem turbine generator.511 (see FIG. 17)Installed on top.
[0004]
  Nos. 21 and 22 support the high-pressure turbine shaft 61. 1 (# 1) bearing and No. 2 (# 2) bearings 23 and 24 support the intermediate pressure turbine shaft 62. 3 (# 3) bearing and No. 4 (# 4) bearings 25 and 26 support the low-pressure turbine shaft 63a. No. 5 (# 5) bearing and No. 6 (# 6) bearings 27 and 28 support the low-pressure turbine shaft 63b. 7 (# 7) bearing and No. 8 (# 8) bearings 29a and 29b support the generator shaft 64. 9 (# 10) bearing and 10 (# 10) bearing.
[0005]
  And each bearing 21-28, 29a, 29b of the said turbine generator is the weight of the high pressure turbine 2, the intermediate pressure turbine 3, the 1st low pressure turbine 4, the 2nd low pressure turbine 5, and the generator 6 in these each bearing. The turbine base is adjusted by adjusting the vertical position of each bearing through a shim or the like so as to be loaded according to the bearing capacity.511 (see FIG. 17)It is fixed to.
[0006]
  FIG. 17 shows a low-pressure turbine and a condenser in a conventional turbine generator.parallelFIG. 6 is a view (A-A arrow view of FIG. 3) viewed in a direction. As shown in FIG. 17, the condenser 10 is attached to lower portions of the first and second low-pressure turbines 4 and 5 via expansion joints 71. The condenser 10 has its lower surface fixed to the foundation frame 50, and the expansion joint 71 absorbs the difference in thermal expansion between the first and second low-pressure turbines 4 and 5 attached to the turbine frame 511 as described above. It is supposed to be.
[0007]
  FIG. 7 shows an example of a turbine generator mounted on a common steel stand (steel stand 1). The configuration of the turbine generator and the arrangement of the bearings in FIG. 7 are the same as those in FIG. 3, and the same members as those in FIG. 3 are denoted by the same reference numerals. still,111Is an instrument for turbine generators.
[0008]
  As shown in FIG. 7, in the installation apparatus in which the turbine generator is installed on the common steel gantry 1, the turbine generator is mounted on the steel gantry 1 elastically supported on the foundation gantry 50. Since it is fixed, the expansion joint 71 as shown in FIG. 17 is not provided for the reason described later.
[0009]
  However, the figure17The conventional condenser mounting structure as shown in FIG. 1 and the bearing alignment method based on such a mounting structure have the following problems.
[0010]
  During the operation of the turbine generator, a downward vacuum load due to the vacuum in the condenser 10 acts on the first and second low-pressure turbines 4 and 5 and the condenser 10. Figure17Since the expansion joint 71 is interposed between the low-pressure turbines 4 and 5 and the condenser 10, the above-described vacuum load applied to the low-pressure turbine side is fixed to the low-pressure turbines 4 and 5 shown in FIG. Is received by the turbine mount 511. Therefore, when the steel mount 1 is used for the turbine mount 511, the steel mount 1 is less rigid than the concrete mount and has a large deformability. It is difficult in strength. Therefore, when the steel mount 1 is used, the vacuum load is reduced by connecting the low pressure turbines 4 and 5 and the condenser 10 directly without providing the expansion joint 71. It does not act on any of the vessels 10.
[0011]
  However, as described above, in the installation structure in which the turbine generator is installed on the steel mount 1 and the expansion joint 71 is not used, the condenser 10 is thermally expanded upward during the operation of the turbine generator. At the same time, since the steel gantry 1 to which the turbine generator is fixed is also made of steel, the cradle 1 itself is more thermally deformed than the concrete gantry. For this reason, when the alignment is performed based on the bearing load when the turbine generator is cold as in the conventional method, during the operation of the turbine generator, the thermal expansion of the condenser 10 or the steel frame is performed. The bearings 21 to 28, 29a, and 29b of the gantry 1 are displaced up and down due to the thermal deformation and the deformation due to the vacuum load, and the bearing load of each bearing is changed from the initial alignment time. This causes non-uniformity of the bearing and causes wear and seizure of the bearing.
[0012]
  Therefore, the present inventionEyesSpecifically, in a steam turbine plant in which a turbine generator is supported by a steel mount, the vacuum load of the condenser can be supported without excessive deformation of the steel mount, and the heat of the condenser It is intended to prevent the occurrence of problems such as excessive bearing load due to expansion and thermal deformation of the steel cradle and bearing wear-and-seizure associated therewith.
[0013]
  Next, in a steam turbine plant of a type in which each device of the steam turbine plant is fixed on a steel mount 1, as shown in FIG. 7, the steel mount 1 has a higher thermal conductivity than a concrete mount. Is remarkably large and easily deformed by heat.
[0014]
  For this reason, in the said steam turbine plant, steam piping and each bearing part 7 and 8 are used.,Heat from the oil drain pipe through which the lubricating oil heated by lubricating 9, 211, etc. flows is transmitted to the steel pedestal 1, which makes the steel pedestal 1 susceptible to thermal deformation.
[0015]
  However, in the steam turbine plant, conventionally, the steam pipes are arranged substantially symmetrically in the left and right directions with respect to the rotation center of the turbine, while the oil drain pipes have branch pipes extending from the respective bearing portions. 1 is attached to one side, and is configured to be returned to the oil tank through a drained oil main pipe extending in the front-rear direction.
[0016]
  For this reason, in the conventional steam turbine plant, since the oil drain main pipe is disposed on one side of the steel gantry 1, the steel gantry 1 is thermally deformed on the side where the oil drain main pipe is attached. Becomes larger than the opposite side and deforms asymmetrically with respect to the turbine rotation axis, causing problems such as fluctuations in bearing alignment and increase in shaft vibration.
[0017]
  Therefore, the present inventionOther first considerations related toIn a steam turbine plant in which a steam turbine and a generator are mounted on a steel gantry, the thermal deformation of the steel gantry due to uneven piping around the steel gantry and the variation in bearing alignment caused by this It is to prevent the occurrence of problems such as increased shaft vibration.
[0018]
  Next, in a turbine power plant in which a generator is driven by a gas turbine or a steam turbine (hereinafter referred to as a turbine), the total length in the installed state in which the turbine and the generator are connected is long and heavy. The installation structure is a highly rigid installation structure.
[0019]
  FIG. 18 is a schematic front view showing an example of the installation structure of the turbine power plant (with the rotation axis as the center).parallelFIG. 18 shows a building of a power plant, 111 is an equipment operation floor in the same building, and 112 is a concrete mount. A turbine generator 113 is formed by directly connecting the turbine and the generator. The turbine generator 113 is fixed on the concrete mount 112.
[0020]
  When the turbine generator 113 is manufactured at a manufacturing plant, transported to a power plant by a transportation vehicle such as a marine vehicle, and installed at the installation location in the building 110, conventionally, the turbine and the generator are installed in the manufacturing plant. After manufacturing and connecting the two on the operation platform in the factory and performing the specified performance and strength confirmation test operation, the turbine and the generator are removed from the operation platform and mounted on the transportation system to the installation location. As shown in FIG. 18, the turbine and the generator are connected by performing predetermined adjustment such as alignment adjustment on the concrete mount 112, and fixed on the mount 112.
[0021]
  However, in the above conventional method, the turbine and the generator are connected by performing predetermined adjustments such as alignment adjustment on the operation stand in the production factory, and after performing various test operations, the two are disconnected. Since the turbine and the generator are installed with the above-mentioned predetermined adjustments again on the concrete mount 112 at the installation location (in the power plant building 110), they are installed and transported in the transportation facility. In addition to requiring a great number of man-hours for transportation to the installation site, there is a problem that the installation work efficiency is reduced due to the complicated construction of other related equipment.
[0022]
  Further, in the above conventional method, since the turbine generator 113 is fixed on the concrete mount 112, the generated load at the time of the earthquake becomes large and it is easy to be directly affected by the earthquake.
[0023]
  Therefore, the inventors of the present invention, in Japanese Patent Application No. 10-176163, attach the above-mentioned plurality of devices to a single steel pedestal and fix them to form a module body in which both are integrated, and the module body is installed. A method of fixing to the building structure such as the building of the place was proposed.
[0024]
  However, since the above method is a method in which a plurality of devices are mounted on a single steel pedestal, transported and installed, the number of devices connected in the axial direction such as a low-pressure 4-flow reheat steam turbine is large. In the case of a long plant, it may be difficult to apply.
[0025]
  Therefore, the present inventionOther second study issues related toThe number of devices connected in the axial direction is large, and even in a plant with a long total length, the number of man-hours for transportation and installation work with the above devices mounted on a steel mount is significantly reduced compared to the conventional method, The purpose is to improve the efficiency of installation work by avoiding complications with other works, and to reduce transportation and installation costs.
[0026]
  Next, in recent years, in a thermal power plant, a steam turbine and a generator are fixed on a single steel pedestal, and the steel pedestal is connected to a basic gantry via a vibration damper comprising a plurality of spring mechanisms and viscous friction dampers. The installation method which installs on the top has been adopted.
[0027]
  As an example of a steam turbine and a generator (hereinafter referred to as a turbine generator) using such a steel gantry, as shown in FIG. 7, a high pressure is provided on a steel gantry 1 formed by welding a number of steel plates. There is a turbine 2, an intermediate pressure turbine 3, two sets of low pressure turbines 4, 5 and a generator 6 arranged in series and fixed to the gantry 1. Reference numeral 10 denotes a condenser connected to the lower part of the two sets of low-pressure turbines 4 and 5.
[0028]
  7 is a bearing portion between the intermediate pressure turbine and the first stage low pressure turbine 4, 8 is a bearing portion between the first stage low pressure turbine 4 and the second stage low pressure turbine 5, and 9 is a second stage low pressure turbine. 5 is a bearing portion between 5 and the generator 6. Further, reference numeral 111 denotes an instrument for various measurements of the turbine generator. The instrument 111 is fixed at a position in the vicinity of the high-pressure turbine 2 of the steel mount 1.
[0029]
  19 to 20 show a conventional example of the steel pedestal 201. FIG. 19 is a plan view (viewed along arrow BB in FIG. 20), and FIG. 20 is an AA view in FIG. It is an arrow view. 19 to 20, reference numeral 211 denotes a turbine mounting space that is a space for mounting the turbines 2 to 5, and 221 is a generator mounting space that is a space for mounting the generator 6.
[0030]
  71 is a floor plate, 72 is a bottom plate, 73 is a front plate, 74 is a rear plate, 75 and 76 are side plates, and this steel mount 20 is configured by forming each plate from a steel plate directly or directly. A plurality of steel plate ribs 77 as strength members are appropriately provided inside and welded to the respective plates by being bent into a predetermined shape and welded.
[0031]
  However, the conventional turbine generator installation structure using the steel mount as shown in FIGS. 19 to 20 has the following problems.
[0032]
  The steel cradle 201 is formed by welding a number of steel plates as described above, and is lighter and has a required rigidity as compared with a concrete cradle or the like. The natural frequency of itself becomes high and becomes a value close to the rated rotational speed of the turbine generator.
[0033]
  For this reason, in the installation structure using the conventional steel cradle 201, the natural frequency of the steel cradle 201 and the shaft rotation speed of the turbine generator may be synchronized. Resonance between the shaft vibration of the turbine generator and the natural vibration of the steel pedestal 201 occurs, causing bearing wear or seizure, damage to the rotating shaft, and the like.
[0034]
  Therefore, the present inventionOther third examination issues related toIn equipment installation equipment using steel mounts, the rigidity of the steel mounts is increased to increase the natural frequency, and the natural frequency of the steel mounts is avoided from synchronizing with the shaft rotation speed. This is to prevent the occurrence of bearing wear, seizure and shaft damage.
[0035]
[Means for Solving the Problems]
  The present invention solves the above problems, andOfMeans for achieving the object is as described in claim 1.
[0036]
  That is, the means of claim 1 isSteamedAir turbine plant installation methodThe steam turbine and generator including a low pressure turbine with a condenser fixed directly to the lower end are fixed to a steel frame made by welding steel, and the steel frame is fixed via a spring mechanism and a vibration damper. In aligning the bearings of the steam turbine plant that is supported by the foundation frame,The vertical position of each of the bearings in the cold state is determined by the bearing mounting portion on the steel mount during the steam turbine plant operation.Due to thermal deformation of the condenser and the steel mountUpTowardsThe direction corresponding to the amount of displacement in the direction opposite to the operating position from the reference alignment positionLow positionIt is characterized by being set to be shifted to.
[0037]
  According to the above means, the vertical position (alignment) in the cold state of each bearing,With condenserDuring the operation of the steel mountUpward due to thermal deformationOnly the amount corresponding to the displacement is the reference alignment position.ReversedirectionLow positionSince each of the bearings isWith condenserAbove steel mountTo heatDue to the displacement, the reference alignment position is obtained. As a result, each bearing is held at a normal bearing load, and the bearing load of a specific bearing does not become excessive and the bearing does not cause wear or seizure.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0039]
  FIG. 3 is a schematic side view showing an example of a steam turbine generator to which the present invention is applied.
[0040]
  In FIG. 3, 2 is a high-pressure turbine, 3 is a medium-pressure turbine, 4 is a first low-pressure turbine, 5 is a second low-pressure turbine, 6 is a generator, and 10 is a condenser. Reference numeral 61 denotes a high-pressure turbine shaft that is a rotating shaft of the high-pressure turbine 2, 62 denotes an intermediate-pressure turbine shaft that is a rotating shaft of 3, and 63 a and 63 b denote low-pressure turbines that are rotating shafts of the first low-pressure turbine 4 and the second low-pressure turbine 5. A shaft 64 is a generator shaft which is a rotating shaft of the generator 6, and these shafts are connected in a skewer shape to constitute a tandem turbine generator.
[0041]
  Nos. 21 and 22 support the high-pressure turbine shaft 61. 1 (# 1) bearing and No. 2 (# 2) bearings 23 and 24 support the intermediate pressure turbine shaft 62. 3 (# 3) bearing and No. 4 (# 4) bearings 25 and 26 support the low-pressure turbine shaft 63a. No. 5 (# 5) bearing and No. 6 (# 6) bearings 27 and 28 support the low-pressure turbine shaft 63b. 7 (# 7) bearing and No. 8 (# 8) bearings 29a and 29b support the generator shaft 64. 9 (# 9) bearing and 10 (# 10) bearing.
[0042]
  The bearings 21, 22, 23, 24, 25, 26, 27, 28, 29a and 29b of the turbine generator are mounted on the steel mount 1 by an alignment method as will be described later.
[0043]
  FIG. 7 is an external perspective view showing a state in which the turbine generator is mounted on the steel mount 1. The configuration of the turbine generator and the arrangement of the bearings in FIG. 7 are the same as those in FIG. 3, and the same members as those in FIG. 3 are denoted by the same reference numerals. still,111Is an instrument for turbine generators.
[0044]
  1 to 2 are claims1'sCorresponding to the inventionone1 shows an installation structure of a steam turbine plant according to an embodiment, FIG. 1 is a view taken along line AA in FIG. 3, and FIG. 2 is a structural view of a Z part and a Y part in FIG. 1, that is, a spring mechanism and a damping damper. is there.
[0045]
  In FIG. 1, the first low-pressure turbine 4 and the second low-pressure turbine 5 are fixed on the steel mount 1 as described above. The condenser 10 is directly fixed to the lower ends of the first and second low-pressure turbines 4 and 5 without using an expansion joint 71 as shown in FIG.
[0046]
  Further, the steel pedestal 1 is elastically and vibration-proof supported by the base pedestal 50 through a plurality of spring mechanisms 40 and a plurality of vibration dampers 30 arranged in parallel. Further, the condenser 10 has a plurality of spring mechanisms 40 and damping dampers 30 arranged in parallel between the lower end thereof and the foundation frame 50, and these spring mechanisms 40 and damping dampers 30 provide elasticity and prevention. It is supported by vibration.
[0047]
  In FIG. 2 showing the details of the spring mechanism 40 and the damping damper 30, a plurality of the spring mechanisms 40 are arranged in parallel between the upper spring receiver 40a, the lower spring receiver 40b, and the upper spring receiver 40a and the lower spring receiver 40b. A spring (compression spring) 40g provided, and an adjustment bolt 40e for adjusting the mounting load of the spring 40g. The spring mechanism 40 has an adhesive spring receiving sheet 40c interposed between the upper spring receiver 40b and the steel mount 1 or the condenser 10, and an adhesive sheet between the lower spring receiver 40a and the basic mount 50. The steel frame 1 or the condenser 10 and the foundation frame 50 are inserted via 40d.
[0048]
  On the other hand, the damping damper 30 is formed by sealing a viscous fluid 30c such as silicon oil in a sealed space formed between the upper case 30a and the lower case 30b. The upper case 30a is welded to the lower surface of the steel pedestal 1 or the condenser 10 (it may be bolted), and the lower case 30b is fixed to the basic pedestal 50 by a plurality of bolts 30e.
[0049]
  In the turbine generator installation structure configured as described above, during operation of the turbine generator, only the weight of each device constituting the turbine generator acts downward on the steel mount 1 and receives a vacuum load. There is nothing.
[0050]
  Thereby, it is possible to prevent an excessive load due to the vacuum load from acting on the steel pedestal 1 like the conventional one.
[0051]
  During the operation of the turbine generator as described above, the condenser 10 and the first low-pressure turbine 4 and the second low-pressure turbine 5 to which the condenser 10 is fixed cause vertical displacement due to the thermal expansion of the condenser 10. Since the cradle 1 and the condenser 10 are supported by the base gantry 50 via the spring mechanism 40 and the vibration damper 30, the elastic and vibration-damping support mechanism including the spring mechanism 40 and the vibration damper 30 described above is used. Such vertical displacement is absorbed, and this vertical displacement does not apply an excessive load to the steel mount 1.
[0052]
  Next, a bearing alignment method for the turbine generator according to the above embodiment will be described. As described above, the condenser 10 is displaced upward due to its thermal expansion. Further, since the steel pedestal 1 is formed by welding steel materials, the cradle 1 itself undergoes thermal deformation due to a temperature rise, and also deforms due to a force such as a vacuum load F as described above. Therefore, the steel pedestal 1 is displaced upward as a whole by deformation due to thermal expansion of the condenser 10 and deformation of the gantry 1 itself.
[0053]
  FIG. 4 shows the state of the displacement in the axial direction of the steel mount 1. In FIG. 4, A is the reference alignment for displacement 0 (zero), B is the actual displacement of the gantry 1 during operation, and # 1 to # 10 are No. 1 bearing 21-No. The positions of the 10 bearings 29b are shown.
[0054]
  As apparent from FIG. 4, the steel mount 1 is displaced upward as a whole during operation, and the amount of displacement is affected by the thermal expansion of the condenser 10, the first and second low-pressure turbines 4, 5. The vicinity of (LP1, LP2) is the largest.
[0055]
  For this reason, in the embodiment of the present invention, the alignment of the bearings 21 to 29b at the time of cooling of the turbine generator, that is, the installation, that is, the vertical position of the bearing is changed from the reference alignment shown in the A line of FIG. As a result, the alignment of the bearings 21 to 29b becomes a C line symmetrical to the B line in FIG.
[0056]
  According to the above embodiment, since the alignment of each bearing of the turbine generator is set at a position lower than the reference alignment A by an amount corresponding to the displacement amount during the operation of the steel mount 1, the turbine generator During the operation, the alignment of the bearings 21 to 29b becomes the position of the reference alignment A due to the upward displacement of the steel gantry 1 as shown by line B in FIG.
[0057]
  As a result, the bearing load of each of the bearings 21 to 29b of the turbine generator is maintained at a normal bearing load set by the reference alignment A line, and the bearing load of a specific bearing becomes excessive and wear or burnt of the bearing. Inducing sticking is avoided.
[0058]
  Next, FIGS.The first study example examined by the present inventors in connection with the present inventionThe piping structure of a steam turbine plant is shown, FIG. 5 is the top view, and FIG. 6 is A arrow view of FIG. FIG. 7 is an external perspective view of a steam turbine plant in which the piping structure is used.
[0059]
  In FIG. 7, 1 is a steel mount made by welding steel materials, 2 is a high-pressure turbine, 3 is a medium-pressure turbine, 4 is a first low-pressure turbine, 5 is a second low-pressure turbine, 6 is a generator, and 10 is condensate. Instrument 111 is an instrument.
[0060]
  Reference numeral 211 denotes a bearing portion on the front side of the high-pressure turbine 2, 7 denotes a bearing portion between the intermediate-pressure turbine 3 and the first low-pressure turbine 4, and 8 denotes a bearing portion between the first low-pressure turbine 4 and the second low-pressure turbine 5. , 9 is a bearing portion between the second low-pressure turbine 5 and the generator 6. The steel gantry 1 to which each device of the steam turbine plant as described above is fixed is attached to a base gantry (not shown) via a plurality of spring mechanisms and damping dampers (all not shown). The basic configuration described above is the same as the conventional one.
[0061]
  thisExamination exampleIn FIG. 7, the piping structure of the steam turbine plant shown in FIG. 7 is improved.
That is, in FIGS. 5 to 6, reference numeral 1 denotes a steel mount, and the high pressure turbine 2, the intermediate pressure turbine 3, the first low pressure turbine 4, and the second low pressure turbine 5 are placed on the steel mount 1 as in FIG. 7. And the generator 6 is connected and fixed in the shape of a skewer. Reference numeral 17 denotes an oil tank that is fixed on the foundation frame 53.
[0062]
  Reference numerals 11 and 12 denote a left row oil drain pipe and a right row oil drain pipe respectively attached to the left side and right side of the steel gantry 1. The left row drain pipe 11 and the right row drain pipe 12 include bearings 21, 7, 8 of the high pressure turbine 2, intermediate pressure turbine 3, first low pressure turbine 4, second low pressure turbine 5, and generator 6. , 9 etc., the lubricating oil discharged from the lubricating portions flows through the branch pipes 14 and 15 in the left and right rows.
[0063]
  The right row oil drain pipe 12 communicates with the left row oil drain pipe 11 via a communication pipe 13, and a collecting pipe 16 is provided downstream of the joining portion by the communication pipe 13. It is connected to the tank 17.
[0064]
  As shown in FIG. 2, the left row oil drain pipe 11 and the right row oil drain pipe 12 have their center lines 31 and 32 having the same distance S (substantially the same distance) with respect to the rotation axis 301 of the steam turbine plant. In addition, the pipe diameter and the pipe length are preferably set symmetrically in the left and right directions (horizontal direction perpendicular to the rotation axis 301). The left branch pipe 14 and the right branch pipe 15 are also provided symmetrically with respect to the rotational axis 301 in terms of the number, pipe length, and pipe diameter.
[0065]
  In the steam turbine plant configured as described above, the lubricating oil (waste oil) heated by lubricating the lubricating parts such as the bearing parts 21, 7, 8, 9 (see FIG. 3) of each turbine is The oil flows into the left row drain pipe 11 and the right row drain pipe 12 through the left and right branch pipes 14 and 15. The lubricating oil that has flowed through the right row drain pipe 12 passes through the communication pipe 13, merges with the lubricating oil from the left row drain pipe 11 at a downstream portion thereof, and returns to the oil tank 17 through the collecting pipe 16.
[0066]
  Since the temperature of the lubricating oil, that is, the drained oil after lubricating each part of the steam turbine plant rises at the time of the draining, the temperatures of the left and right row drain pipes 11 and 12 and the left and right branch pipes 14 and 15 are increased. Rises, and the temperature of the steel gantry 1 to which these pipes are attached also rises.
[0067]
  However, the present inventionExamination exampleAs described above, the left row drain pipe 11 and the right row drain pipe 12 are provided symmetrically with the rotation axis 301 of the steel gantry 1, and the left branch pipe 14 and the right branch pipe 15 are provided. Therefore, the temperature of the steel mount 1 to which these pipes are attached is also substantially the same on the left side and the right side with respect to the rotation axis 30.
[0068]
  As a result, the thermal deformation caused by the temperature rise of the oil drain pipe system of the steel pedestal 1 is substantially the same on the left and right with respect to the rotation axis 30. The occurrence of problems such as increased vibration is avoided.
[0069]
  In addition, thisExamination exampleIn this case, the oil draining pipe system is provided symmetrically with respect to the rotation axis 301 of the steel gantry 1, but in addition to this, other pipes serving as a heating source for the steam pipe and the steel gantry 1 are also used for the rotation axis. It can be provided symmetrically with respect to the center 301.
[0070]
  In addition, bookExamination exampleIsShow hereThe present invention is not limited to such a tandem low-pressure four-flow reheat turbine, and can be applied to any steam turbine plant in which the steam turbine is supported on a steel mount.
[0071]
  Next, FIGS.Of the second examination example examined by the inventor in connection with the present invention.FIG. 8 is a side view of the main part showing the installation state of the steam turbine plant, FIG. 9 is an external perspective configuration diagram showing the installation state, and FIG. 10 is a connection part of a steel mount. FIG. 11 is a perspective view taken along the line AA of FIG. 10, FIG. 12 is a schematic perspective view showing the module body during transportation on a ship, and FIG. 13 shows the module body fixing means during the transportation. It is a side view.
[0072]
  8 to 9, 2 is a high-pressure turbine, 3 is an intermediate-pressure turbine, 4 is a first low-pressure turbine, 5 is a second low-pressure turbine, 6 is a generator, and 10 is a condenser. Reference numeral 61 denotes a high-pressure turbine shaft that is a rotating shaft of the high-pressure turbine 2, 62 denotes an intermediate-pressure turbine shaft that is a rotating shaft of the intermediate-pressure turbine 3, and 63 a and 63 b denote rotating shafts of the first low-pressure turbine 4 and the second low-pressure turbine 5. A certain low-pressure turbine shaft 64 is a generator shaft that is a rotating shaft of the generator 6, and these shafts are connected in a skewer shape to constitute a tandem steam turbine generator.
[0073]
  Nos. 21 and 22 support the high-pressure turbine shaft 61. 1 (# 1) bearing and No. 2 (# 2) bearings 23 and 24 support the intermediate pressure turbine shaft 62. 3 (# 3) bearing and No. 4 (# 4) bearings 25 and 26 support the low-pressure turbine shaft 63a. No. 5 (# 5) bearing and No. 6 (# 6) bearings 27 and 28 support the low-pressure turbine shaft 63b. 7 (# 7) bearing and No. 8 (# 8) bearings 29a and 29b support the generator shaft 64. 9 (# 9) bearing and 10 (# 10) bearing.
[0074]
  In FIG. 9, 211 is a bearing portion at the front of the high pressure turbine 2, 7 is a bearing portion between the intermediate pressure turbine 3 and the first low pressure turbine 4, and 8 is a first low pressure turbine 4 and a second low pressure turbine. Reference numeral 5 denotes a bearing portion, reference numeral 9 denotes a bearing portion between the second low-pressure turbine 5 and the generator 6, and reference numeral 45 denotes a rear bearing portion of the generator 6.
[0075]
  Reference numeral 1 denotes a steel gantry, which is divided into three parts in the axial direction: a front gantry 101, a central gantry 102, and a rear gantry 103, which are connected by bolts 34 as will be described later. The front frame 101 constituting the steel frame 1 has the high pressure turbine 2 and the medium pressure turbine 3 as No. 1. 1 bearing 21, no. 2 bearing 22, no. 3 bearing 23 and no. 4 is fixed via a bearing 24, and the first and second low-pressure turbines 4 and 5 are provided on the central frame 102. 5 bearing 25, No. 5 6 bearing 26, no. 7 bearing 27 and no. 8 is fixed via a bearing 28, and the generator 6 is attached to the rear frame 103. 9 bearings and It is fixed via 10 bearings.
[0076]
  The front frame 101 hasHigh pressureThe turbine 2, the intermediate pressure turbine 3 and all the members attached thereto, and the piping and wiring are provided on the central frame 102. The first and second low-pressure turbines 4 and 5 and all the members attached thereto, and the piping and wiring are provided on the central frame 102. However, the generator 6 and all members attached thereto, piping and wiring are attached to the rear frame 103 so that the frames 101, 102 and 103 can be separated and transported. Reference numeral 104 denotes a coupling portion between the front frame 101 and the central frame 102, and reference numeral 105 denotes a coupling portion between the central frame 102 and the rear frame 103.
[0077]
  In addition, the division | segmentation aspect of the said steel mount 1 is thisAspect exampleNot limited to this, it may be divided into two or more than four.Examination exampleNot limited to this aspect, a required number of devices can be fixed.
[0078]
  As described above, the steel frame 1 in which the three frames 101, 102, and 103 are coupled is connected to the foundation frame via the plurality of spring mechanisms 40 and the vibration damper 30.50Installed.
[0079]
  As shown in FIG. 13 or FIG. 8, the spring mechanism 40 includes an upper spring receiver 40a.(See Figure 2)Lower spring support 40b(See Figure 2)A plurality of springs (compression springs) 40g provided in parallel between the upper spring receiver 40a and the lower spring receiver 40b, and an adjustment bolt 40e for adjusting the mounting load of the spring 40g.(See Figure 2)Consists of. The spring mechanism 40 includes an upper spring receiver 40.aAn adhesive spring receiving sheet 40c is interposed between the lower spring receiver 40 and the steel mount 1.bAnd foundation mount50With the adhesive sheet 40d interposed between the steel frame 1 and the foundation frame50Is inserted between.
[0080]
  On the other hand, as shown in FIG. 13 or FIG. 8, the damping damper 30 has a viscous fluid 30c such as silicon oil in a sealed space formed between the upper case 30a and the lower case 30b.(See Figure 2)Is enclosed. The upper case 30a is welded to the lower surface of the steel mount 1 (it can be bolted), and the lower case 30b has a plurality of bolts 30e.(See Figure 2)By the above foundation mount50It is fixed to.
[0081]
  The detail of the coupling | bonding aspect of each divided | segmented mount in the said steel mounts 1 is shown in FIGS. 10 to 11 show the connecting portion 104 between the front frame 101 and the central frame 102, the connecting portion 105 between the central frame 102 and the rear frame 103 has the same configuration.
[0082]
  10 to 11, reference numerals 32 and 33 denote connection plates for the front frame 101 and the center frame 102, and the connection surfaces thereof are finished smoothly. Reference numeral 31 denotes a coupling that connects the intermediate-pressure turbine shaft 62 and the first low-pressure turbine shaft 63a. The connecting plates 32 and 33 have a figure.11As shown in FIG. 3, a plurality of coupling bolts 34 are arranged at substantially equal intervals along the circumference thereof, and the connecting plates 32 and 33 are fastened. Two or more positioning pins 35 are provided on the pitch line of the bolt 34 so that the upper and lower surfaces of the front frame 101 and the central frame 102 are aligned with each other.
[0083]
  The assembly at the manufacturing plant of the steam turbine plant configured as described above, transportation to the installation site, and the installation method at the installation site will be described.
[0084]
  First, in the manufacturing factory, the front frame 101, the central frame 102, and the rear frame 103 are separately manufactured, and the upper surface and the lower surface thereof are aligned with a jig or the like and positioned with the pins 35. . Next, the front frame 101 is attached or fixed to the high pressure turbine 2, the intermediate pressure turbine 3, and the pipes and wiring attachments, and the central frame 102 is attached to the first and second low pressure turbines 4, 5 and the piping and wiring. Attached members including are attached or fixed, and further, attached members including the generator 6 and piping and wiring are fixed or attached to the rear frame 103.
[0085]
  Then, as shown in FIG. 12, a module body 501 in which each device is attached or fixed to the front frame 101, the central frame 102 and the rear frame 103 together with piping and wiring as described above is shown in FIG. As shown, they are connected by bolts 34 and pins 35 and attached to operating equipment in the factory to perform a predetermined test run.
[0086]
  After the above trial run, the bolt 34 is removed and the modules 101, 102, 103 unitsbodyEach module is divided into 501Body 501It is mounted on a ship (transportation system) every time.
[0087]
  FIG. 12 is a perspective view when the module body 501 is temporarily fixed to the hull 51 of the ship and transported to the installation place. In FIG. 5, a module body in which accessories including a high-pressure turbine 2 and an intermediate-pressure turbine 3 and piping and wiring are fixed on a front frame 101 constituting the module body 501.501Is temporarily fixed on the frame 53 of the hull 51 through the spacer 52 by the following method.
[0088]
  That is, when the module body 501 is temporarily fixed to the hull 51 of the ship, as shown in FIG. And at least four fixing spacers 52 are inserted between the frame 53 and the hull frame 53, and the steel frame is secured with bolts 52a.1And tighten to the frame 53. For the spring mechanism 40, see FIG.13As shown in FIG. 4, the temporary fixing bolt 40h is inserted from the frame 53 with the adhesive sheets 40c and 40d inserted into the spring mechanism 40, and the spring mechanism 40 and the steel mount.1Tighten the three together.
[0089]
  At this time, the fixing bolt 40h is an exclusive bolt, or among the plurality of bolts for adjusting the spring load of the spring 40g of the spring mechanism 40, an appropriate number of bolts are used for the frame 53, the spring mechanism 40 and the module body. You may use it elongate so that it can penetrate the steel mount 1 of 501.
[0090]
  The damping damper 30 is attached in a state where the viscous fluid 30c in the space 30f is extracted. In this case, since the upper case 30a of the vibration damper 30 is fixed to the steel mount 1 by welding or the like as described above, the lower surface of the lower case 30b only needs to be placed on the frame 53.
[0091]
  In the temporarily fixed state as described above, the module body 501 is transported to the installation location. During such transportation, even if the hull 51 swings due to sea waves or the like, the module body 501 is firmly fixed to the frame 53 of the hull as described above, so that it can be transported without any trouble.
[0092]
  Next, the turbine power generation at the installation site (power plant)MachineFor installation, the fixing spacer 52 is removed from the temporarily fixed state to the ship hull 51 shown in FIGS. 12 to 13, and the bolt 40 h temporarily fixing the spring mechanism 40 is extracted, and the steel frame (front The above-mentioned module body 501 having the above-mentioned device mounted on the base frame 101 or the like) is the basic frame.50put on top.
[0093]
  As shown in FIG. 8, as shown in FIGS. 10 and 11, the connecting portion 104 of the front frame 101 and the central frame 102 of each module body 501 and the connecting portion 105 of the central frame 102 and the rear frame 103 are shown. They are connected via bolts 34 and pins 35. And the lower surface of the steel gantry 1 and the foundation gantry connected as described above50The spring mechanism 40 and the vibration damper 30 are inserted between them.
[0094]
  The spring mechanism 40 sets the attachment load of the spring 40g by adjusting the length of the bolt 40e for adjusting the spring load, and inserts the adhesive sheet 40c between the upper spring receiver 40a and the steel mount 1. Along with the lower spring support 40b and the foundation stand50By inserting the adhesive sheet 40d between the steel frame 1 and the foundation frame50With a required mounting load.
[0095]
  The damping damper 30 is set so as to obtain a predetermined damping performance and encloses the viscous fluid 30c, and the steel gantry 1 and the foundation gantry.50Intervene between.
[0096]
  As described above, in this study example, in the manufacturing plant, the equipment constituting the steam turbine plant is divided and attached to each of the divided steel bases 101, 102, and 103 to form a module body 501, and this module body.501As it is, it is temporarily fixed on the frame 53 of a transportation facility such as a ship and transported to the installation location.
[0097]
  At the installation location, the steel frame, that is, the front frame 101, the central frame 102, the rear frame 103, and the modules 501 composed of the devices attached to these frames are connected to each other to connect the spring mechanism 40 and the vibration damper. Through foundation mount50Since it was installed above, it was transported as a module body 501 integrated with the steel bases 101 to 103 without removing the components of the steam turbine plant that was trial run in the production factory, and installed at the installation location. This eliminates the need to remove steam turbine plant equipment for transportation at the production plant, reduces the number of man-hours required for transportation from the production plant to the installation site, and reduces the number of steam turbine plant installations during installation. Reattachment to the steel mount 1 and alignment adjustment are omitted, and the number of installation steps is reduced.
[0098]
  Further, each device constituting the steam turbine plant is divided into one or a plurality of units, and each module is attached to a steel frame divided in the axial direction, that is, the front frame 101, the central frame 102, or the rear frame 103. Since each module body 501 is transported for each body 501 and connected to each other at the installation location,8Even in a steam turbine plant with a large number of turbines and a long overall length as shown in the above embodiment, transportation and installation by modularization using the steel mount 1 can be easily performed with a small number of work steps as described above. Can be done.
[0099]
  Next, FIGS.Of the third examination example examined by the inventor in connection with the present invention.FIG. 14 is a perspective view of an external appearance of a main part of a steam turbine generator installation device, FIG. 15 is a perspective view of a steel mount, and FIG. 16 is a schematic side view of a concrete filling portion of the steel mount. FIG.
[0100]
  In FIG. 14, reference numeral 1 denotes a steel mount formed by welding a large number of steel plates, and the detailed configuration will be described later. On the steel pedestal 1, a high-pressure turbine 2, an intermediate-pressure turbine 3, two sets of low-pressure turbines 4, 5 and a generator 6 are arranged and fixed in series to constitute a turbine generator. Reference numeral 10 denotes a condenser connected to the lower part of the two sets of low-pressure turbines 4 and 5.
[0101]
  7 is a bearing portion between the intermediate pressure turbine and the first stage low pressure turbine 4, 8 is a bearing portion between the first stage low pressure turbine 4 and the second stage low pressure turbine 5, and 9 is a second stage low pressure turbine. 5 is a bearing portion between 5 and the generator 6. Furthermore, 11 is an instrument for various measurements of the turbine generator, and the instrument 11 is fixed at a position in the vicinity of the high-pressure turbine 2 of the steel mount 1. The steel gantry 1 to which the turbine generator is fixed is supported on a base gantry (not shown) by a plurality of spring mechanisms and damping dampers (all not shown).
[0102]
  15-16 which show the detail of the said steel mount 1, 1a is the space for high and medium pressure attachment for attaching the said high pressure turbine 2 and the intermediate pressure turbine 3, 1b and 1c are the 1st low pressure turbine 4 and the 2nd low pressure A low-pressure turbine mounting space for mounting the turbine 5, 1 d is a generator mounting space for mounting the generator 6.
[0103]
  As described above, the steel pedestal 1 is formed by welding a number of steel plates, and includes an upper floor plate 211 to which the turbine generator is attached, and a bottom plate 221 to which the spring mechanism and damping damper are attached. A large number of vertical plates 231 and intermediate plates 241 are connected to each other to form a box shape as a whole. 21a is a floor surface that serves as a mounting surface for the turbine generator, and 22a is a floor surface that serves as a mounting surface for the spring mechanism and damping damper.
[0104]
  Reference numeral 1e denotes a bearing mounting surface serving as a mounting surface of the bearing portion 7 between the intermediate pressure turbine 3 and the first low pressure turbine 4, and reference numeral 1f denotes a bearing portion 8 between the first low pressure turbine 4 and the second low pressure turbine 5. A bearing mounting surface 1 g is a bearing mounting surface that is a mounting surface of the bearing portion 9 between the second low-pressure turbine 5 and the generator 6. Reference numeral 1h denotes a meter mounting surface for mounting the meter 11.
[0105]
  In the steel pedestal 1, the space portions below the bearing mounting surfaces 1e, 1f, 1g on which the weight of the turbine generator is intensively loaded (the length in the axial direction of the turbine generator is a.₁, A₂, A₃) Is filled with concrete 24a, 24b, 24c.
[0106]
  As shown in FIG. 16, the concrete 24 a, 24 b, 24 c is placed in the space between the lower surface of the upper floor plate 211 and the upper surface of the lower bottom plate 221 of the steel frame 1 in the longitudinal direction (axis line Direction) as above₁, A₂, A₃In the width direction, the entire width of the gantry 1 is filled in the width direction, and the space is filled tightly so that no gap is formed between each steel plate.
[0107]
  The concrete 24a to 24c has a predetermined distance b in the longitudinal direction from each space in addition to the space below the bearing mounting surfaces 1e, 1f, and 1g.₁And c₁, B₂And c₂, B₃And c₃By extending (filling appropriately), the rigidity in the vicinity of the bearing portion, particularly the rigidity against the rolling load is increased.
[0108]
  Further, the steel pedestal 1 has a constant length in the longitudinal direction, i.e., a length d and a width e of the portion where the weight of the instrument 111 is applied, in the lower space portion of the instrument mounting surface 1h. It is filled in the same form as the bearing.
[0109]
  In the steel mount 1 configured as described above, concrete 24a, 24b, and 24c are filled in the space below the bearing mounting surfaces 1e, 1f, and 1g on which the weight of the turbine generator is concentrated and loaded. Therefore, the rigidity of the part that supports the bearing parts 7, 8, and 9 increases.
[0110]
  As a result, in the steel pedestal 1, deformation of a portion that supports the bearing portions 7, 8, and 9 under severe load conditions is suppressed, and the natural frequency increases due to the increase in rigidity. Then, by appropriately setting the filling amount and filling position of the concrete 24a to 24c, the natural frequency can always be kept higher than the operating shaft rotational speed (rated rotational speed) of the turbine generator. It is possible to prevent the occurrence of resonance due to the synchronization between the natural frequency of the gantry 1 and the shaft rotation speed.
[0111]
  Further, the steel pedestal 1 has a certain length (b) in the longitudinal direction connected to the lower space of the bearing mounting surfaces 1e, 1f, and 1g.₁And c₁, B₂And c₂, B₃And c₃) Is filled with concrete 24a to 24c, the rigidity of the support portion of the rolling load in each of the bearing portions 7, 8, and 9 is increased, and the strength of the steel gantry 1 against the rolling load is improved.
[0112]
  Furthermore, since the steel pedestal 1 is filled with concrete even in the portion where the weight of the instrument 111 is loaded, the rigidity of this part increases, and local deformation of the pedestal 1 due to the weight of the instrument 11 is avoided. The
[0113]
  Note that the steel mount isAspect exampleIn addition to the anti-vibration and anti-seismic support method using a spring mechanism and damping damper, the installation method is such that the steel base 1 is directly fixed to the foundation base without using the anti-vibration and anti-seismic support. Is also applicable.
[0114]
【The invention's effect】
  The present invention is configured as described above. According to the invention of claim 1,Has the following effectsRu.
[0115]
  That is, according to the invention of claim 1, each bearing of the steam turbine plant is in operation.With condenserSteel mountUpward due to thermal deformationThe displacement is held at the reference alignment position. As a result, each bearing is held at a normal bearing load, and the bearing load of a specific bearing is prevented from being excessively caused to cause wear or seizure, thereby improving the durability and life of the bearing.
[Brief description of the drawings]
FIG. 1 of the present inventiononeFruitProcessingThe figure seen from the low-pressure turbine which concerns on a state, and the axial center of a condenser at a right angle direction (AA line arrow view of FIG. 3).
FIG. 2 is a detailed cross-sectional view of the spring mechanism and the vibration damper in the embodiment (detailed view of a Z part and a Y part in FIG. 1).
FIG. 3 is a schematic side view of a steam turbine plant to which the present invention is applied.
[Figure 4]ImplementationThe action explanatory view in a form.
FIG. 5 shows the present invention.Of the first study example studied by the present inventorThe schematic plan view which shows arrangement | positioning of the drain pipe of a steam turbine plant.
6 is a view taken in the direction of arrow A in FIG.
FIG. 7 is an external perspective view showing an example of a steam turbine plant attached to a steel mount.
FIG. 8Of the second example studied by the present inventorThe principal part side view which shows the installation state of a steam turbine plant.
FIG. 9 AboveSecond study exampleThe external appearance perspective view which shows the installation state of the steam turbine plant in FIG.
FIG. 10 AboveSecond study exampleThe side view which shows the connection part of the steel mount frame in.
11 is an AA arrow view of FIG.
FIG. 12Second study exampleThe principal part perspective view which shows the temporarily fixed state at the time of transport of the module body in FIG.
FIG. 13 is a side view showing a fixed state of the module body during the transportation.
FIG. 14 shows the present invention.Of the third study example studied by the present inventorThe principal part external appearance perspective view of the installation apparatus of a steam turbine generator.
FIG. 15 aboveThird study exampleThe external appearance perspective view of the steel mount frame in.
FIG. 16 AboveThird study exampleThe principal part side view of the steel mount frame in FIG.
FIG. 17 is a diagram corresponding to FIG. 1 showing a conventional condenser mounting structure.
FIG. 18 is a front view showing an installation structure of a conventional steam turbine plant.
FIG. 19 is a vertical sectional view of a conventional steel pedestal (cross sectional view taken along line BB in FIG. 5).
20 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
  1 Steel mount
  2 High-pressure turbine
  3 Medium pressure turbine
  4 First low-pressure turbine
  5 Second low pressure turbine
  6 Generator
  7, 8, 9, 211 Bearing part
  10 Condenser
  11 Left drain oil pipe
  12 Right drain oil pipe
  13 Communication pipe
  14,15 Branch pipe
  16 Collecting pipe
  17 Oil tank
  21 No. 1 bearing
  22 No. 2 bearings
  23 No. 3 bearings
  24 No. 4 bearings
  24a-24d concrete
  25 No. 5 bearings
  26 No. 6 bearings
  27 No. 7 bearings
  No. 28 8 bearings
  29a No. 9 bearings
  29b No. 10 bearings
  30 Damping damper
  32, 33 connecting plate
  34 volts
  35 pins
  40 Spring mechanism
  50 foundation stand
  51 hull
  52 Spacer
  53 frames
  61 High-pressure turbine shaft
  62 Medium pressure turbine shaft
  63a, 63b Low pressure turbine shaft
  64 Generator shaft
  101 Front stand
  102 Central stand
  103 Rear stand
  104,105 joint
  501 Module body

Claims (1)

A steam turbine including a low-pressure turbine with a condenser fixed directly at the lower end and a generator are fixed to a steel frame made by welding steel, and the steel frame is fixed to a basic frame via a spring mechanism and a damping damper. In the alignment of the bearings of the steam turbine plant that is supported by the above, the vertical position of each of the bearings in the cold state is determined based on the above- mentioned recovery during the operation of the steam turbine plant of each bearing mounting portion on the steel mount. by an amount corresponding to the displacement amount of the upper side by water vessel and thermal deformation of the steel frame, a steam turbine and the position during operation from a reference alignment position and sets shifted to lower reverse position How to install the plant.

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