JP2022012799A - Turbine facility monitor device and turbine facility monitor method - Google Patents

Abstract

To provide a turbine facility monitor device and the like that can easily determine whether an adjustment of alignment among a plurality of rotors is necessary.SOLUTION: An embodiment is a turbine facility monitor device that monitors a relative core difference in which a first rotor is displaced in a radial direction to a second rotor in a turbine facility provided with at least the first rotor and second rotor, and having the first rotor and second rotor arranged so as to line in an axial direction. The turbine facility monitor device has: a core difference estimation unit that obtains a relative core difference estimation value by estimating the relative core difference on the basis of a bearing metal temperature measurement value obtained by measuring a bearing metal temperature about a bearing rotatably supporting each of the first rotor and second rotor; a differential value calculation unit that calculates a differential value between a relative core difference estimation value and a relative core difference setting value set as to the relative core difference; and a notification unit that notifies when the differential value exceeds a preset threshold.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a turbine equipment monitoring device and a turbine equipment monitoring method.

In turbine equipment where multiple rotors are axially connected and each of the rotors is rotatably supported by bearings, the alignment between the rotors may change over time and deviate from the proper state. There is. For example, the above-mentioned problems may occur due to the subsidence of the foundation supporting the turbine equipment. As a result, a large load is applied to the bearing, increasing the possibility of damage.

Japanese Unexamined Patent Publication No. 2017-44572

When adjusting the rotor alignment by periodic inspection, a lot of incidental work is required, so it is not easy to perform periodic inspection efficiently. Therefore, it is desirable to adjust the rotor alignment when necessary. However, in the past, it has not been possible to easily determine whether or not the rotor alignment needs to be adjusted.

An object to be solved by the present invention is to provide a turbine equipment monitoring device and a turbine equipment monitoring method that can easily determine whether or not alignment between a plurality of rotors is necessary.

An embodiment is a turbine facility in which a first rotor and a second rotor are provided at least, and the first rotor and the second rotor are arranged so as to be aligned in the axial direction, in which the first rotor has a diameter with respect to the second rotor. Bearing metal temperature measurement obtained by measuring the bearing metal temperature of a bearing that rotatably supports each of the first rotor and the second rotor, which is a turbine equipment monitoring device that monitors the relative center difference deviated in the direction. The difference value between the core difference estimation unit that obtains the relative core difference estimated value by estimating the relative core difference based on the value and the relative core difference set value set for the relative core difference estimated value and the relative core difference. It has a difference value calculation unit for calculation and a notification unit for notifying when the difference value exceeds a preset threshold value.

FIG. 1 is a diagram schematically showing a main part of the turbine equipment 1 according to the embodiment. FIG. 2 is a diagram schematically showing the relative core difference monitored by the turbine equipment monitoring device 80 in the turbine equipment 1 according to the embodiment. FIG. 3 is a flow chart showing an operation when the turbine equipment monitoring device 80 monitors the relative center difference in the turbine equipment 1 according to the embodiment.

[A] Configuration FIG. 1 is a diagram schematically showing a main part of the turbine equipment 1 according to the embodiment.

As shown in FIG. 1, in the present embodiment, the turbine equipment 1 includes a first turbine 10, a second turbine 20, a generator 50, and a turbine equipment monitoring device 80. Each part constituting the turbine equipment 1 of the present embodiment will be sequentially described.

[A-1] First turbine 10
The first turbine 10 accommodates the first turbine rotor 12 in the first turbine casing 11. The first turbine 10 is, for example, a single-flow high-pressure turbine, and is configured to rotate the first turbine rotor 12 by introducing a working medium into the first turbine casing 11.

In the first turbine 10, the first turbine rotor 12 is rotatably supported by a pair of bearings 131 and 132 along the horizontal direction. The bearings 131 and 132 support the first turbine rotor 12 by a sliding surface formed of a metal material (Babbitt metal). Temperature sensors 141 and 142 are installed in each of the pair of bearings 131 and 132 that support the first turbine rotor 12. The temperature sensors 141 and 142, for example, are thermocouples and measure the temperature of the sliding surface of the bearings 131 and 132 that supports the first turbine rotor 12 as the bearing metal temperature.

[A-2] Second turbine 20
The second turbine 20 accommodates the second turbine rotor 22 in the second turbine casing 21. The second turbine rotor 22 is arranged so as to be aligned with the first turbine rotor 12 in the axial direction, and is connected to the first turbine rotor 12. The second turbine 20 is, for example, a double-flow low-pressure turbine in which a working medium having a lower temperature and pressure than the working medium introduced in the first turbine casing 11 is introduced into the second turbine casing 21. The second turbine rotor 22 is configured to rotate. Here, the medium that has finished work in the second turbine 20 is discharged from the second turbine 20 to the condenser 30.

In the second turbine 20, the second turbine rotor 22 is rotatably supported by a pair of bearings 231 and 232 along the horizontal direction. The bearings 231 and 232 support the second turbine rotor 22 by a sliding surface formed of a metal material (Babbitt metal). Temperature sensors 241,242 are installed in each of the pair of bearings 231 and 232 that support the second turbine rotor 22. The temperature sensors 241,242 measure, for example, the temperature of the sliding surface of the bearings 231,232 that supports the second turbine rotor 22 as the bearing metal temperature, which is a thermocouple.

[A-3] Generator 50
In the generator 50, the rotating shaft is connected to the second turbine rotor 22, and the generator 50 is configured to generate electricity by the rotation of the first turbine rotor 12 and the second turbine rotor 22.

[A-4] Turbine equipment monitoring device 80
The turbine equipment monitoring device 80 is a turbine equipment 1 in which the first turbine rotor 12 and the second turbine rotor 22 are arranged so as to be aligned in the axial direction, and the first turbine rotor 12 is radially relative to the second turbine rotor 22. It is provided to monitor the relative misalignment in the deviation.

The turbine equipment monitoring device 80 includes an arithmetic unit (not shown) and a memory device (not shown), and the arithmetic unit performs arithmetic processing using a program stored in the memory apparatus to monitor the relative center difference. Is configured to run.

FIG. 2 is a diagram schematically showing the relative core difference monitored by the turbine equipment monitoring device 80 in the turbine equipment 1 according to the embodiment.

As shown in FIG. 2, the relative misalignment D is the rotation center of the end located on the side of the second turbine rotor 22 of the first turbine rotor 12 and the side of the first turbine rotor 12 of the second turbine rotor 22. Corresponds to the distance in the vertical direction (vertical direction in FIG. 2) from the rotation center of the end portion located at.

In the present embodiment, in order to monitor the relative center difference as shown in FIG. 2, the turbine equipment monitoring device 80 includes the center difference estimation unit 81, the difference value calculation unit 82, and the notification unit 83, as shown in FIG. Has.

[B] Operation FIG. 3 is a flow chart showing an operation when the turbine equipment monitoring device 80 monitors the relative center difference in the turbine equipment 1 according to the embodiment.

In the present embodiment, the operation when the turbine equipment monitoring device 80 monitors the relative misalignment will be described with reference to FIG. 1 and FIG.

[B-1] Bearing temperature measurement step (ST10)
As shown in FIG. 3, when monitoring the relative center difference, the bearing metal temperature is measured (ST10).

Here, the temperature sensors 141, 142, 241, 242 measure the bearing metal temperature for the bearings 131, 132, 231, 232. The temperature sensors 141 and 142 measure the bearing metal temperature of the portion of the bearings 131 and 132 formed of a metal material so as to support the first turbine rotor 12. The temperature sensors 241,242 measure the bearing metal temperature of the portion of the bearings 231,232 that is formed of a metal material so as to support the second turbine rotor 22. The bearing metal temperature measurement value obtained by measuring the bearing metal temperature of the bearings 131, 132, 231, 232 by the temperature sensors 141, 142, 241, 242 is output to the core difference estimation unit 81 of the turbine equipment monitoring device 80. (See Fig. 1).

[B-2] Center difference estimation step (ST20)
Next, as shown in FIG. 3, estimation of the relative center difference is executed (ST20).

Here, the center difference estimation unit 81 estimates the relative center difference between the first turbine rotor 12 and the second turbine rotor 22 based on the bearing metal temperature measurement value input as described above. Obtain an estimated core difference.

The core difference estimation unit 81 uses, for example, a lookup table in which the bearing metal temperature measurement value and the relative core difference estimation value are recorded in association with each other, and the relative core corresponding to the input bearing metal temperature measurement value is used. Output the difference estimate.

The look-up table performed load operation under multiple conditions (for example, 25% load, 50% load, 75% load, 100% load) in the turbine equipment 1 and measured the bearing metal temperature and the relative core difference, respectively. Created based on the results. The bearing metal temperature rises as the relative core difference increases and the distance between the first turbine rotor 12 and the second turbine rotor 22 and the sliding surfaces of the bearings 131, 132, 231 and 232 becomes narrower.

[B-3] Difference value calculation step (ST30)
Next, as shown in FIG. 3, the difference value between the relative center difference estimated value and the relative center difference set value is calculated (ST30).

Here, the difference value between the relative core difference estimated value estimated by the core difference estimation unit 81 and the relative core difference set value preset for the relative core difference is calculated by the difference value calculation unit 82 of the turbine equipment monitoring device 80. Is calculated.

The relative center difference set value is, for example, the relative center difference measured when the turbine equipment 1 is in the initial state (at the time of construction).

[B-4] Judgment step (ST40)
Next, as shown in FIG. 3, it is determined whether or not the difference value exceeds the threshold value (ST40).

Here, the notification unit 83 determines whether or not the difference value calculated by the difference value calculation unit 82 exceeds a preset threshold value. The threshold value is a reference value for determining that adjustment is not necessary for the relative core difference between the first turbine rotor 12 and the second turbine rotor 22, and the notification unit 83 substantially determines the relative core difference. When adjustment is necessary, it is judged that the threshold value has been exceeded.

[B-5] Notification step (ST50)
When it is determined that the difference value exceeds the threshold value, notification is executed as shown in FIG. 3 (ST50).

Here, the notification unit 83 executes notification.

For example, when the notification unit 83 includes a display and determines that the difference value exceeds the threshold value (allowable value), the notification unit 83 displays to that effect on the display to perform notification. In addition to this, if the notification unit 83 includes a speaker and it is determined that the difference value exceeds the threshold value, the notification unit 83 may be configured to perform notification by outputting a voice to that effect from the speaker. good.

On the other hand, if it is determined that the difference value does not exceed the threshold value (No), the notification is not executed.

[C] Summary As described above, in the present embodiment, the relative core difference estimated value is obtained based on the bearing metal temperature measured value, and the difference value between the estimated relative core difference estimated value and the relative core difference set value. Notifies when exceeds the threshold. As described above, in the present embodiment, when the relative core difference between the first turbine rotor 12 and the second turbine rotor 22 needs to be adjusted, notification is performed.

Therefore, in the present embodiment, it is possible to easily determine whether or not the alignment between the first turbine rotor 12 and the second turbine rotor 22 needs to be adjusted. As a result, in the present embodiment, periodic inspection can be efficiently performed.

[D] Modification Example The modification of the above embodiment will be described below.

[D-1] Modification 1
In the above embodiment, the core difference estimation unit 81 corresponds to the relative core corresponding to the bearing metal temperature measurement value by using a look-up table in which the bearing metal temperature measurement value and the relative core difference estimation value are recorded in association with each other. The case of outputting the difference estimated value has been described, but the present invention is not limited to this. The misalignment estimation unit 81 may use a look-up table that records factors other than the bearing metal temperature measurement value and the bearing metal temperature measurement value in association with the relative misalignment estimation value.

For example, in addition to the bearing metal temperature measurement value, a lookup table that records the relative core difference estimated value in association with the vacuum degree measurement value measured by the pressure sensor for the vacuum degree of the water condenser 30 is recorded in the core difference estimation unit. 81 may be used. In this case, the center difference estimation unit 81 outputs the relative center difference estimation value corresponding to each factor of the bearing metal temperature measurement value and the vacuum degree measurement value by using the look-up table.

Furthermore, in addition to the bearing metal temperature measured value and the vacuum degree measured value, the look that records the relative center difference estimated value in association with the lubrication amount and the lubrication temperature of the lubricating oil supplied to the bearings 131, 132, 231, and 232. The uptable may be used by the core difference estimation unit 81. In this case, the center difference estimation unit 81 uses the look-up table to obtain a relative center difference estimation value corresponding to each factor of the bearing metal temperature measurement value, the vacuum degree measurement value, the refueling amount, and the refueling temperature. Output.

[D-2] Modification 2
In the above embodiment, in the turbine equipment monitoring device 80, the notification unit 83 executes notification based on the detection result of the vibration sensor (not shown) that detects vibration of the first turbine rotor 12 and the second turbine rotor 22. It may be configured as follows.

For example, when the detected frequency or amplitude exceeds a predetermined allowable value, the notification unit 83 determines that it is abnormal and notifies that fact. For example, it may be configured to notify when it is determined that an abnormality such as oil whip vibration has occurred due to a decrease in bearing load.

[D-3] Modification 3
In the above embodiment, the turbine equipment monitoring device 80 notifies based on the bearing metal temperature rise rate at which the bearing metal temperature measurement value rises with respect to the increase in the rotation speed of the first turbine rotor 12 and the second turbine rotor 22. The unit 83 may be configured to execute the notification.

The bearing metal temperature changes according to the friction loss in the oil film of the lubricating oil interposed between the first turbine rotor 12 and the second turbine rotor 22 and the bearings 131, 132, 231, 232, and the first turbine rotor. It increases as the rotation speeds of the 12 and the second turbine rotor 22 increase. Further, when wiping (melt flow) occurs in the bearings 131, 132, 231, 232 due to foreign matter mixed in the oil film, the bearing metal temperature rise rate further increases. Therefore, in this modification, for example, when the bearing metal temperature rise rate exceeds a predetermined threshold value, it is determined that an abnormality such as wiping has occurred, and the notification unit 83 executes notification to that effect.

Further, the notification unit 83 monitors whether or not the bearing metal temperature rise rate changes within a predetermined allowable range at the time of starting, and if it is out of the allowable range, determines that it is abnormal and notifies that fact. May be. In this case, it is preferable to monitor whether or not the transition is within the permissible range according to the plurality of activation modes.

[D-4] Modification 4
In the above embodiment, the turbine equipment monitoring device 80 calculates the bearing load applied to the bearings 131, 132, 231 and 232 from the measured value of the bearing metal temperature, and the notification unit 83 notifies the notification based on the calculated bearing load. It may be configured to run.

Since the bearing load and the bearing metal temperature are in a proportional relationship, the bearing load can be calculated from the measured value of the bearing metal temperature. When the calculated bearing load exceeds a predetermined allowable value, the notification unit 83 determines that it is abnormal and notifies that fact.

[D-5] Modification 5
In the above embodiment, it is preferable that the turbine equipment monitoring device 80 is configured so that the look-up table used by the core difference estimation unit 81 can be changed after the rotor alignment is executed in the periodic inspection. As a result, even after the rotor alignment is executed, the relative core difference estimated value corresponding to the bearing metal temperature measured value can be estimated with high accuracy.

[D-6] Modification 6
In the above embodiment, each of the temperature sensors 141 and 142 has a plurality of thermocouples, and the plurality of thermocouples may be installed so as to be arranged in the axial direction of the first turbine rotor 12. Similarly, each of the temperature sensors 241,242 may have a plurality of thermocouples and may be installed so that the plurality of thermocouples are arranged in the axial direction of the second turbine rotor 22. Then, the notification unit 83 may be configured to execute notification based on the bearing metal temperature measurement values measured by the plurality of thermocouples in each of the temperature sensors 141, 142, 241, 242.

When the outer peripheral surface of the first turbine rotor 12 and the sliding surface of the bearings 131 and 132 are in one-sided contact with each other in the axial direction, and the outer peripheral surface of the second turbine rotor 22 and the sliding surface of the bearings 231 and 232 are in contact with each other. When one-sided contact is made without uniform contact in the axial direction, a temperature difference occurs between the bearing metal temperature measurement values measured by a plurality of thermocouples arranged in the axial direction. Therefore, the notification unit 83 determines that the temperature difference between the bearing metal temperature measurement values measured by the plurality of thermocouples arranged in the axial direction exceeds a predetermined allowable value, and notifies the fact that the temperature difference is abnormal. do.

<Others>
Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, the case where the turbine equipment 1 of the above embodiment includes two turbines (first turbine 10, second turbine 20) has been described, but the case where three or more turbines are included is the same as the above embodiment. It may be configured.

1: Turbine equipment, 10: 1st turbine, 11: 1st turbine chamber, 12: 1st turbine rotor (1st rotor), 20: 2nd turbine, 21: 2nd turbine casing, 22: 2nd turbine Rotor (second rotor), 30: water condenser, 50: generator, 80: turbine equipment monitoring device, 81: core difference estimation unit, 82: difference value calculation unit, 83: notification unit, 131, 132: bearing, 141, 142: Temperature sensor, 231,232: Bearing, 241,242: Temperature sensor

Claims (2)

In a turbine facility having at least a first rotor and a second rotor and arranged such that the first rotor and the second rotor are aligned in the axial direction, the first rotor is radially relative to the second rotor. It is a turbine equipment monitoring device that monitors the relative misalignment that is deviated in
Relative core difference by estimating the relative core difference based on the bearing metal temperature measurement value obtained by measuring the bearing metal temperature of the bearing that rotatably supports each of the first rotor and the second rotor. The core difference estimation unit that obtains the estimated value and the core difference estimation unit
A difference value calculation unit that calculates a difference value between the relative core difference estimated value and the relative core difference set value set for the relative core difference, and a difference value calculation unit.
It has a notification unit that notifies when the difference value exceeds a preset threshold value.
Turbine equipment monitoring equipment. In a turbine facility having at least a first rotor and a second rotor and arranged such that the first rotor and the second rotor are aligned in the axial direction, the first rotor is radially relative to the second rotor. It is a turbine equipment monitoring method that monitors the relative misalignment in the above direction.
A bearing temperature measurement step of obtaining a bearing metal temperature measurement value by measuring the bearing metal temperature of the bearing that rotatably supports the first rotor and the second rotor.
A core difference estimation step for obtaining a relative core difference estimated value by estimating the relative core difference based on the bearing metal temperature measured value, and
A difference value calculation step for calculating a difference value between the relative core difference estimated value and the relative core difference set value set for the relative core difference, and
It has a notification step for notifying when the difference value exceeds a preset threshold value.
Turbine equipment monitoring method.

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