JP2016056921A - Bearing alignment adjustment device and bearing alignment adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a generation risk of a bearing trouble.SOLUTION: A bearing alignment adjustment device adjusts bearing alignment of bearings 3a, 3b, 3c, 3d of a high-to-middle pressure rotor 1 and a low pressure rotor 2. The bearing alignment adjustment device includes: temperature sensors 4a, 4b, 4c 4d for measuring metal temperatures of the bearings 3a, 3b, 3c, 3d; and a bearing alignment adjustment unit for adjusting bearing alignment by adjusting vertical heights of the bearings 3a, 3b, 3c, 3d so that the measured metal temperatures fall with in a predetermined target value.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a bearing alignment adjusting device and a bearing alignment method.

  The turbine of the rotating electrical machine is supported by a bearing. As an example of the bearing support method, the high and medium pressure rotor is supported by a bearing that is fixed using an independent bearing stand. The low pressure rotor is supported by a bearing supported by the casing.

  In general, the start-up process of the turbine is performed in the process of turning (turning the turbine at a low rotation speed), raising the vacuum of the condenser, starting the turbine, reaching the turbine rated speed, and running the load. In each process, the turbine bearing alignment varies depending on various factors.

As a first factor, when the vacuum of the condenser rises, the low pressure casing connected to the condenser changes so as to be pulled inward by the vacuum load, and the change is caused by the bearing of the bearing supported by the low pressure casing. Examples include changing the alignment.
The second factor is that the bearing alignment is changed by the thermal expansion of the bearing base due to the radiant heat of the casing and the expansion of the bearing due to the increase of the oil temperature as the rotational speed increases and the load increases after the turbine is started.

In general, a cold offset value is provided at the vertical height of each bearing in consideration of the above-described alignment change so as to obtain an optimum bearing alignment during the turbine rated load operation.
Therefore, in transient operation other than turbine rated load operation, a specific bearing having a large cold offset value bears a larger bearing load than other bearings.

  In addition, in the low-speed rotation region of the turbine, the oil film thickness of the lubricating oil between the rotor journal portion and the bearing metal is about several microns, which is very thin. Due to these factors, there is a concern that there is a high risk of occurrence of a failure of a specific bearing in a low-speed rotation region.

  As an example of a bearing failure, there is a case where the rotor and the bearing metal come into contact with each other. It is known that the bearing metal temperature rises as a sign that this case occurs.

  In order to avoid the above problem, in the prior art, a temperature measurement sensor and a heater or a heat exchanger are attached to the bearing support structure, and the output of the heater and the heat exchanger is controlled based on the detection signal of the temperature measurement sensor. There is an axis alignment adjustment system that adjusts the alignment.

Japanese Patent Laid-Open No. 11-336752

  However, in the above prior art, since the bearing alignment is not adjusted based on the state of the bearing, a clear feedback for avoiding a bearing failure cannot be obtained. Therefore, the bearing alignment change in the transient operation state cannot be dealt with, and a bearing failure may occur.

  In addition, as described above, in the conventional bearing support method, the cold offset value is provided in the vertical height of the bearing during the turbine rated load operation. However, in this conventional method, the bearing height is not during the turbine rated load operation. The offset cannot be canceled. For this reason, the bearing load of a specific bearing becomes large except during the turbine rated load operation, and the risk of occurrence of a bearing failure of the bearing in the turbine low-speed rotation range is relatively high.

  Further, in the conventional bearing support method, the bearing alignment cannot be automatically adjusted so as to correspond to the change in the bearing alignment in the starting process.

  The problem to be solved by the present invention is to provide a bearing alignment adjustment device and a bearing alignment adjustment method capable of reducing the risk of occurrence of a bearing failure.

  The bearing alignment adjusting device in the embodiment is a bearing alignment adjusting device that adjusts the bearing alignment of the bearing of the rotor, and a temperature measuring unit that measures the temperature of the metal of the bearing, and the measured temperature is within a predetermined target value And a bearing alignment adjustment unit that adjusts the bearing alignment by adjusting the vertical height of the bearing.

  The bearing alignment adjusting device in the embodiment is a bearing alignment adjusting device that adjusts the bearing alignment of the rotor bearing, and the pressure sensor that measures the bearing load of each bearing and the measured bearing load is within a predetermined target value. And a bearing alignment adjustment unit that adjusts the bearing alignment by adjusting the vertical height of the bearing.

  A bearing alignment adjusting device in an embodiment is a bearing alignment adjusting device that adjusts bearing alignment of a bearing of a rotor including a low-pressure rotor, and a condenser provided in a casing of the low-pressure rotor, and a vacuum degree of the condenser And a bearing alignment adjusting unit that adjusts the bearing alignment by adjusting the vertical height of the bearing until the measured degree of vacuum rises to a predetermined target value.

  The bearing alignment adjustment method in the embodiment is a method applied to a bearing alignment adjustment device that adjusts the bearing alignment of the bearing of the rotor, and measures the metal temperature of the bearing, and the measured temperature is a predetermined target value. The bearing alignment is adjusted by adjusting the vertical height of the bearing to be within.

  According to the present invention, the risk of bearing failure can be reduced.

The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 1st Embodiment. The block diagram which shows the function structural example of the computer of the bearing alignment adjustment apparatus in 1st Embodiment. The conceptual diagram which shows an example of the cold offset setting of the bearing of the bearing alignment adjustment apparatus in 1st Embodiment. The flowchart which shows an example of the bearing alignment adjustment procedure at the time of the turbine starting by the bearing alignment adjustment apparatus in 1st Embodiment. The flowchart which shows an example of the bearing alignment adjustment procedure at the time of the turbine stop by the bearing alignment adjustment apparatus in 1st Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 2nd Embodiment. The block diagram which shows the function structural example of the computer of the bearing alignment adjustment apparatus in 2nd Embodiment. The conceptual diagram which shows distribution of the bearing load about the bearing alignment adjustment apparatus in 2nd Embodiment. The flowchart which shows an example of the bearing alignment adjustment procedure at the time of the turbine starting by the bearing alignment adjustment apparatus in 2nd Embodiment. The flowchart which shows an example of the bearing alignment adjustment procedure at the time of the turbine stop by the bearing alignment adjustment apparatus in 2nd Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 3rd Embodiment. The block diagram which shows the function structural example of the computer of the bearing alignment adjustment apparatus in 3rd Embodiment. The flowchart which shows an example of the bearing alignment adjustment procedure by the bearing alignment adjustment apparatus in 3rd Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 4th Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 5th Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 6th Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 7th Embodiment. The conceptual diagram which shows an example of the bearing alignment adjustment apparatus in 8th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
(First embodiment)
First, the first embodiment will be described.
FIG. 1 is a conceptual diagram illustrating an example of a bearing alignment adjusting device according to the first embodiment.
As shown in FIG. 1, the first embodiment includes a high / medium pressure rotor 1, a low pressure rotor 2, and a computer 5. One end of the high and medium pressure rotor 1 is rotatably supported by a bearing 3a, and the other end is rotatably supported by a bearing 3b. One end of the low-pressure rotor 2 is rotatably supported by a bearing 3c, and the other end is rotatably supported by a bearing 3d. Each of the bearings 3a to 3d may be simply referred to as a bearing 3.

  Each bearing 3 is incorporated with a temperature sensor 4 made of, for example, a thermocouple for detecting the bearing metal temperature of the bearing 3. Specifically, a temperature sensor 4a for detecting the bearing metal temperature of the bearing 3a is incorporated in the bearing 3a. A temperature sensor 4b for detecting the bearing metal temperature of the bearing 3b is incorporated in the bearing 3b. A temperature sensor 4c for detecting the bearing metal temperature of the bearing 3c is incorporated in the bearing 3c. A temperature sensor 4d for detecting the bearing metal temperature of the bearing 3d is incorporated in the bearing 3d.

FIG. 2 is a block diagram illustrating a functional configuration example of a computer of the bearing alignment adjusting device according to the first embodiment.
In the first embodiment, the computer 5 includes a temperature measurement unit 5a, a temperature determination unit 5b, an operation state monitoring unit 5c, and a bearing alignment adjustment unit 5d.
The temperature measuring unit 5a takes in the bearing metal temperature of the bearings 3a to 3d detected by the temperature sensors 4a to 4d as an adjustment parameter for adjusting the bearing alignment. The temperature determination unit 5b determines whether the bearing metal temperature of each of the bearings 3a to 3d is within a predetermined target value. The operation state monitoring unit 5c monitors the operation state of the turbine. The bearing alignment adjustment unit 5d controls a bearing alignment adjustment function for keeping the bearing metal temperature of each bearing 3 within a predetermined target value. A specific example of the alignment adjustment function will be described later.

FIG. 3 is a conceptual diagram illustrating an example of the cold offset setting of the bearing of the bearing alignment adjusting device according to the first embodiment.
In FIG. 3, a to d correspond to the offset values of the bearings 3a to 3d.
When the steam turbine includes the high and medium pressure rotor 1 and the low pressure rotor 2, as shown in FIG. 3, the offset value of the bearing 3b may be designed to be smaller than that of the other bearings. However, in that case, the load on the other bearings 3a, 3c, and 3d is increased, and in particular, the load on the bearing 3c adjacent to the bearing 3b is increased. The bearing metal temperature of the bearing 3 having a large load is higher than the bearing metal temperatures of the other bearings 3.

Therefore, in this embodiment, the computer 5 controls the bearing alignment adjustment function so that the bearing metal temperature of each bearing 3 is within the target value.
For example, it is assumed that the target value of the bearing metal temperature during turning is set within 33 ° C. During turning, the bearing metal temperature of the bearing 3a is 30 ° C., the bearing metal temperature of the bearing 3b is 28 ° C., the bearing metal temperature of the bearing 3c is 34 ° C., and the bearing metal temperature of the bearing 3d is 30 ° C., that is, the bearing 3b. When the metal temperature of each of the other bearings 3 is not within the target value, the computer 5 controls the bearing alignment adjustment function so as to increase the alignment of the bearing 3b.
When the alignment of the bearing 3b is increased by the bearing alignment adjustment function and the load on the bearing 3b is increased, the loads on the other bearings 3a, 3c, and 3d are reduced, and the bearing metal temperature of these bearings 3 is decreased.

  When the bearing metal temperatures of all the bearings 3 are within the target value of 33 ° C., the bearing alignment adjustment function is not output from the bearing alignment adjustment unit 5d of the computer 5, and the bearing alignment adjustment function stops.

FIG. 4 is a flowchart illustrating an example of a bearing alignment adjustment procedure at the time of starting the turbine by the bearing alignment adjusting device according to the first embodiment.
When the operation state monitoring unit 5c monitors the turning-in at the time of starting the turbine and outputs the monitoring result to the temperature determination unit 5b (S1), the temperature determination unit 5b takes in each of the temperature measurement units 5a. It is determined whether or not the bearing metal temperature of the bearing 3 is within a predetermined target value, and the determination result is output to the bearing alignment adjustment unit 5d (S2).

  If the bearing metal temperature of any one of the bearings 3 is not within the target value (NO in S2), the bearing alignment adjustment unit 5d is used for adjusting the bearing alignment so that the bearing metal temperature of each bearing 3 is within the target value. A control command is output (S3).

On the other hand, if the bearing metal temperatures of the respective bearings 3 are all within the target values (YES in S2), the bearing alignment adjustment unit 5d does not perform the bearing alignment adjustment.
In this state, the operation state monitoring unit 5c monitors whether or not the turbine operation state is rotating at high speed, and outputs the monitoring result to the temperature determination unit 5b. When the bearing metal temperatures of the respective bearings 3 are all within the target value and the monitoring result by the operation state monitoring unit 5c indicates that the operation state of the turbine is not high speed rotation (NO in S4), the process returns to S2.

  On the other hand, when the monitoring result by the operation state monitoring unit 5c indicates that the operation state of the turbine is high-speed rotation (YES in S4), this monitoring result is output from the temperature determination unit 5b to the bearing alignment adjustment unit 5d. As a result, the bearing alignment adjustment unit 5d ends the bearing alignment adjustment.

  That is, in the first embodiment, the bearing metal temperature is continuously monitored until the turbine rotates at a high speed, and during that time, if the bearing metal temperature is not within the target value, the bearing alignment adjustment is performed.

FIG. 5 is a flowchart illustrating an example of a bearing alignment adjustment procedure when the turbine is stopped by the bearing alignment adjustment device according to the first embodiment.
When the turbine is stopped, the operation state monitoring unit 5c monitors that the turbine has started to descend, and outputs the monitoring result to the temperature determination unit 5b (S11). Then, when the operation state monitoring unit 5c monitors that the turbine rotation range has become the turbine low-speed rotation range and outputs the monitoring result to the temperature determination unit 5b (S12), the temperature determination unit 5b performs temperature measurement. It is determined whether or not the bearing metal temperature of each bearing 3 taken in by the part 5a is within a predetermined target value, and the determination result is output to the bearing alignment adjustment part 5d (S13).

  If the bearing metal temperature of any one of the bearings 3 is not within the target value (NO in S13), the bearing alignment adjustment unit 5d performs bearing alignment adjustment for setting the bearing metal temperature of each bearing 3 within the target value ( S14).

On the other hand, if the bearing metal temperatures of the respective bearings 3 are all within the target values (YES in S13), the bearing alignment adjustment unit 5d does not adjust the bearing alignment.
In this state, the operation state monitoring unit 5c monitors whether or not the rotational speed of the turbine is 0, and outputs the monitoring result to the temperature determination unit 5b. When all the bearing metal temperatures of the respective bearings 3 are within the target value and the monitoring result by the operation state monitoring unit 5c indicates that the turbine speed is not 0 (NO in S15), the process returns to S13.

  On the other hand, when the monitoring result by the operation state monitoring unit 5c indicates that the turbine speed is 0 (YES in S15), the monitoring result is output from the temperature determination unit 5b to the bearing alignment adjustment unit 5d. As a result, the bearing alignment adjustment unit 5d ends the bearing alignment adjustment.

  That is, in this embodiment, the bearing metal temperature is continuously monitored until the turning is stopped and the turbine rotation speed becomes zero, and during that period, the bearing alignment adjustment is performed unless the bearing metal temperature is within the target value.

  As mentioned above, the bearing alignment is adjusted in each process such as turning, vacuum rise, low-speed rotation range after turbine start-up, low-speed rotation range after turbine stop and turning after stop as described above. By setting the bearing metal temperature of the bearing within the target value, the burden on each bearing 3 can be made uniform. Thereby, the risk of occurrence of bearing failure can be reduced.

(Second Embodiment)
Next, a second embodiment will be described. In addition, the detailed description of the same part as the part demonstrated in 1st Embodiment among the structures in the following each embodiment is abbreviate | omitted.
FIG. 6 is a conceptual diagram illustrating an example of a bearing alignment adjusting device according to the second embodiment.
Instead of the temperature sensor 4 described in the first embodiment, each bearing 3 is incorporated with a pressure sensor 6 made of, for example, a load cell for detecting a bearing load applied to the bearing 3. Specifically, a pressure sensor 6a for detecting the bearing load of the bearing 3a is incorporated in the bearing 3a. A pressure sensor 6b for detecting the bearing load of the bearing 3b is incorporated in the bearing 3b. A pressure sensor 6c for detecting the bearing load of the bearing 3c is incorporated in the bearing 3c. A pressure sensor 6d for detecting the bearing load of the bearing 3d is incorporated in the bearing 3d.

FIG. 7 is a block diagram illustrating a functional configuration example of a computer of the bearing alignment adjusting device according to the second embodiment.
In the second embodiment, the computer 5 includes a bearing load measuring unit 5e, a bearing load determining unit 5f, an operating state monitoring unit 5c, and a bearing alignment adjusting unit 5d.
The bearing load measuring unit 5e takes in the bearing loads of the bearings 3a to 3d detected by the pressure sensors 6a to 6d as adjustment parameters for adjusting the bearing alignment. The bearing load determination unit 5f determines whether or not the respective bearing loads of the bearings 3a to 3d taken in by the bearing load measurement unit 5e are within a predetermined target value. The bearing alignment adjustment unit 5d controls an alignment adjustment function for setting the bearing load of each bearing 3 within a target value.

FIG. 8 is a conceptual diagram showing the distribution of bearing load for the bearing alignment adjusting device in the second embodiment.
The magnitude of the bearing load appears in the bearing load. For this reason, the bearing load of a bearing with a large burden is large, and the bearing load of a bearing with a small burden is small.
When the offset value of the bearing 3b is large downward as shown in FIG. 3, the bearing load of the adjacent bearing 3c is particularly large as shown in FIG.

  For example, assume that the target value of each bearing load is set to the bearing load of each bearing 3 during rated load operation. In a state where the turbine is stopped (before turning), a state where the vacuum rises, or a state where the turbine is in a low speed rotation region, the bearing load of the bearing 3c is often larger than the target value. Therefore, in the second embodiment, the bearing alignment adjustment unit 5d of the computer 5 controls the alignment adjustment function so that the bearing load of each bearing 3 is within the target value.

  The bearing load measuring unit 5e measures the bearing load of each bearing 3 while the turbine is stopped before turning. When the bearing load of the bearing 3c is large, the bearing alignment adjustment unit 5d controls the bearing alignment adjustment function so as to increase the alignment of the bearing 3b adjacent to the bearing 3c.

  By increasing the alignment of the bearing 3b to increase the load on the bearing 3b, the load on the adjacent bearing 3c decreases and the bearing load also decreases. When the bearing loads of all the bearings are within the target value, the control command for controlling the bearing alignment adjustment function by the bearing alignment adjustment unit 5d stops, and the bearing alignment adjustment function stops. By turning the turbine after performing this bearing alignment adjustment, the risk of bearing failure can be reduced as compared with the case where the bearing alignment adjustment is not performed.

FIG. 9 is a flowchart illustrating an example of a bearing alignment adjustment procedure at the time of starting the turbine by the bearing alignment adjusting device according to the second embodiment.
When the operation state monitoring unit 5c monitors the turning ready state before turning in at the start of the turbine and outputs the monitoring result to the bearing load determining unit 5f (S21), the bearing load determining unit 5f Then, it is determined whether the bearing load of each bearing 3 taken in by the bearing load measuring unit 5e is within a predetermined target value, and the determination result is output to the bearing alignment adjusting unit 5d (S22).

  If the bearing load of any one of the bearings 3 is not within the target value (NO in S22), the bearing alignment adjustment unit 5d performs bearing alignment adjustment for keeping the bearing load of each bearing 3 within the target value (S23). .

On the other hand, if the bearing loads of the respective bearings 3 are all within the target values (YES in S22), the bearing alignment adjustment unit 5d does not perform the bearing alignment adjustment.
In this state, the operation state monitoring unit 5c monitors whether or not the operation state of the turbine is the rated load operation, and outputs the monitoring result to the bearing load determination unit 5f. When the monitoring result by the operation state monitoring unit 5c indicates that the operation state of the turbine is not the rated load operation (NO in S24), the process returns to S22.

  On the other hand, when the monitoring result by the operation state monitoring unit 5c indicates that the operation state of the turbine is the rated load operation (YES in S24), the monitoring result is output from the bearing load determination unit 5f to the bearing alignment adjustment unit 5d. The As a result, the bearing alignment adjustment ends.

  In other words, in the second embodiment, the bearing alignment is adjusted so that the bearing load is within the target value before each event of turning-in, vacuum rise, and turbine start-up, and the bearing load is monitored and adjusted even during turbine transient operation. . Adjustment of the bearing alignment is performed until the turbine rated load operation is reached.

FIG. 10 is a flowchart illustrating an example of a bearing alignment adjustment procedure when the turbine is stopped by the bearing alignment adjustment device according to the second embodiment.
When the turbine is stopped, the operation state monitoring unit 5c monitors that the turbine has started to decelerate, and outputs the monitoring result to the temperature determination unit 5b. (S31). Then, the operation state monitoring unit 5c monitors that the turbine rotation region has become the turbine low-speed rotation region, and outputs the monitoring result to the bearing load determination unit 5f (S32).
Then, the bearing load determination part 5f determines whether the bearing load of each bearing 3 taken in by the bearing load measurement part 5e is within a predetermined target value, and outputs this determination result to the bearing alignment adjustment part 5d ( S33).

  If the bearing load of any one of the bearings 3 is not within the target value (NO in S33), the bearing alignment adjustment unit 5d performs bearing alignment adjustment for keeping the bearing load of each bearing 3 within the target value (S34). .

On the other hand, if the bearing loads of the respective bearings 3 are all within the target values (YES in S33), the bearing alignment adjustment unit 5d does not perform the bearing alignment adjustment.
In this state, the operation state monitoring unit 5c monitors whether or not the rotational speed of the turbine is 0, and outputs the monitoring result to the bearing load determination unit 5f. When the monitoring result by the operation state monitoring unit 5c indicates that the turbine speed is not 0 (NO in S35), the process returns to S13.

  On the other hand, when the monitoring result by the operation state monitoring unit 5c indicates that the turbine speed is 0 (YES in S35), the monitoring result is output from the bearing load determination unit 5f to the bearing alignment adjustment unit 5d. As a result, the bearing alignment adjustment is completed.

  That is, in this embodiment, the bearing load is continuously monitored until the turning is stopped and the turbine rotational speed becomes zero, and during that period, the bearing alignment is adjusted unless the bearing load is within the target value.

  As mentioned above, the bearing alignment is adjusted in each process such as turning, vacuum rise, low-speed rotation range after turbine start-up, low-speed rotation range after turbine stop and turning after stop as described above. By setting the bearing load of the bearing within the target value, the load on each bearing 3 can be made uniform. Thereby, the risk of occurrence of bearing failure can be reduced.

(Third embodiment)
Next, a third embodiment will be described.
FIG. 11 is a conceptual diagram illustrating an example of a bearing alignment adjusting device according to the third embodiment.
In the third embodiment, a pressure gauge 9 is provided in the condenser 8 of the low pressure casing 7 of the low pressure rotor 2. The pressure gauge 9 measures deformation of the low pressure casing 7. Although not shown, each bearing 3 is provided with the pressure sensor 6 described in the second embodiment. Each bearing 3 may be provided with the temperature sensor 4 described in the first embodiment instead of the pressure sensor 6.

FIG. 12 is a block diagram illustrating a functional configuration example of a computer of the bearing alignment adjusting device according to the third embodiment.
In the third embodiment, the computer 5 includes a bearing load measuring unit 5e, a bearing load determining unit 5f, a vacuum measuring unit 5g, a vacuum monitoring unit 5h, and a bearing alignment adjusting unit 5d.

  As described in the second embodiment, the bearing load measuring unit 5e takes in the bearing loads of the bearings 3a to 3d detected by the pressure sensors 6a to 6d as adjustment parameters. As described in the second embodiment, the bearing load determination unit 5f monitors the respective bearing loads of the bearings 3a to 3d captured by the bearing load measurement unit 5e, and determines whether or not they are within a predetermined target value. judge. The vacuum degree measuring unit 5g measures the condenser vacuum degree by taking in the measurement result obtained by the pressure gauge 9. The degree-of-vacuum monitoring unit 5h monitors the measurement result by the degree-of-vacuum measurement unit 5g, and determines whether or not the predetermined degree of vacuum is substantially equal. The bearing alignment adjusting unit 5d performs control for alignment adjustment for reducing the burden on a certain bearing according to the determination result by the vacuum degree monitoring unit 5h.

  In the third embodiment, the bearing alignment adjustment unit 5d takes in the determination result by the bearing load determination unit 5f as an adjustment parameter for adjusting the bearing alignment and uses it as feedback for the bearing alignment adjustment. The adjustment parameter may be a bearing metal temperature.

  Generally, in the startup process of the steam turbine, the condenser vacuum increases during turning. Since the low pressure casing 7 is connected to the condenser 8, when the condenser vacuum degree is increased, the low pressure casing 7 is deformed so as to be pulled by the vacuum load of the condenser 8. At that time, the alignment of the bearing 3c and the bearing 3d supported by the low-pressure casing 7 becomes lower with the deformation of the low-pressure casing 7 (the vertical height changes downward).

  When the offset value of the bearing 3b is low as in the first embodiment, the direction of change in the alignment between the bearing 3c and the bearing 3d due to the deformation of the low-pressure casing 7 is a direction that reduces the burden on the bearing 3c.

Therefore, in the third embodiment, before the condenser vacuum increases, the bearing alignment adjustment unit 5d of the computer 5 increases the bearing alignment of the bearing 3b adjacent to the bearing 3c (the vertical height is increased upward). The bearing alignment adjustment is controlled so that the bearing load (or bearing metal temperature) is within the target value.
Further, after the start of the vacuum rise, the computer 5 controls the alignment adjustment so that the bearing alignment of the bearing 3b is lowered (adjusted downward) and returned.

FIG. 13 is a flowchart illustrating an example of a bearing alignment adjustment procedure performed by the bearing alignment adjustment device according to the third embodiment. FIG. 13 shows an example in which the bearing load is used as adjustment feedback.
Before the degree of vacuum rises, the bearing alignment adjustment unit 5d increases the alignment of the bearing 3b in advance (adjusts upward). When the bearing load reaches the target value, the vacuum rise starts.

  The vacuum level monitoring unit 5h determines whether or not the condenser vacuum level measured by the vacuum level measurement unit 5g is substantially equal to a predetermined target vacuum level, and outputs the determination result to the bearing alignment adjustment unit 5d (S41). ). When the vacuum level monitoring unit 5h determines that the condenser vacuum level is not substantially equal to the target vacuum level (NO in S41), the bearing alignment adjustment unit 5d increases (adjusts upward) the bearing alignment of the bearing 3b. Thus, control for bearing alignment adjustment is performed (S42).

  And the bearing load determination part 5f determines whether the bearing load of the bearing 3b taken in by the bearing load measurement part 5e is less than a predetermined management target value, and outputs this determination result to the bearing alignment adjustment part 5d ( S43).

  If the bearing load of the bearing 3b is not within the management target value (NO in S43), the process returns to S42, and the bearing alignment adjustment unit 5d adjusts the bearing alignment so as to increase (adjust upward) the bearing alignment of the bearing 3b. For this purpose (S43 → S42).

  On the other hand, when the bearing load of the bearing 3b is within the management target value (YES in S43) and the vacuum rise of the condenser starts (S44), the bearing alignment adjustment unit 5d lowers the bearing alignment of the bearing 3b (lower) Control for adjusting the bearing alignment so as to adjust in the direction (S45).

  In the third embodiment, since the alignment of the bearing 3b is adjusted based on the condenser vacuum degree, the load on the bearing 3c on the low-pressure rotor 2 side can be reduced, particularly due to the alignment change at the start of the vacuum rise. The risk of occurrence of bearing failures can be reduced.

(Fourth embodiment)
Next, a fourth embodiment will be described.
FIG. 14 is a conceptual diagram showing an example of a bearing alignment adjusting device in the fourth embodiment. In this embodiment, a first example of the alignment adjustment function controlled by the bearing alignment adjustment unit 5d of the computer 5 described in the above embodiments will be described.
As shown in FIG. 14, in the fourth embodiment, a support base 10a which is a support structure of the bearing 3a, a support base 10b supported by the bearing base 11b of the bearing 3b, a support base 10c of the bearing 3c, and a support of the bearing 3d. A pipe for flowing the heating fluid is incorporated into the table 10d. The heated fluid can be obtained, for example, from an auxiliary steam system. The support base 10a is supported by the bearing base 11a, and the support base 10b is supported by the bearing base 11b.

  The pipe is provided with a flow rate adjusting valve 12 for adjusting the flow rate of the heating fluid flowing through the pipe. Specifically, a flow rate adjusting valve 12a is provided in the pipe on the support base 10a side, a flow rate adjusting valve 12b is provided in the pipe on the support base 10b side, and a flow rate adjusting valve 12c is provided on the pipe on the support base 10c side. The flow control valve 12d is provided in the pipe on the support base 10d side. Opening and closing of the flow rate adjusting valve 12 is controlled by a bearing alignment adjusting unit 5 d of the computer 5.

  For example, when the bearing alignment adjusting unit 5d of the computer 5 outputs a control command for increasing the bearing alignment of the bearing 3b to the flow rate adjusting valve 12b, the flow rate adjusting valve 12b is opened. When the flow control valve 12b is opened, the support base 10b is heated and expanded by the heated fluid passing through the pipe on the support base 10b side. By expanding the support base 10b, the bearing alignment of the bearing 3b can be increased. When the adjustment of the bearing alignment is completed, the control command to the flow rate adjustment valve 12b from the bearing alignment adjustment unit 5d of the computer 5 is stopped, and the flow rate adjustment valve 12b is fully closed. In this way, the bearing alignment can be adjusted to reduce the risk of bearing failure.

(Fifth embodiment)
Next, a fifth embodiment will be described.
FIG. 15 is a conceptual diagram showing an example of a bearing alignment adjusting device in the fifth embodiment. In this embodiment, a second example of the alignment adjustment function controlled by the bearing alignment adjustment unit 5d of the computer 5 described in each embodiment will be described.

  As shown in FIG. 15, in the fifth embodiment, pipes for flowing a cooling fluid through the support bases 10 a and 10 b, the support base 10 c, and the support base 10 d are provided. The piping is provided with a flow control valve 12 (12a, 12b, 12c, 12d) as in the fourth embodiment. The cooling fluid can be obtained, for example, from a bearing cooling water system. In general, the bearing alignment of the bearing 3b during the increase in the rotational speed of the turbine is at a low position, and the load on the bearing is small. For this reason, the burden of the bearing 3c adjacent to this bearing 3b is large.

  The support bases 10a, 10b, 10c, and 10d and the bearing bases 11a and 11b are expanded by receiving radiant heat from the low-pressure casing 7 from the start of the increase in the rotational speed of the turbine to the load operation. As the support bases 10a and 10b and the bearing bases 11a and 11b expand to increase the bearing alignment of the bearings 3a and 3b, the load on the bearing 3b increases, so the load on the adjacent bearing 3c is reduced.

  That is, the bearing metal temperature and the bearing load on the low-pressure rotor 2 side are in a large state before the support bases 10a and 10b on the high-medium pressure rotor 1 side and the bearing bases 11a and 11b expand. At that time, the bearing alignment adjusting unit 5d of the computer 5 outputs a control command for opening the flow rate adjusting valves 12c and 12d on the low-pressure rotor 2 side to increase the flow rate of the cooling fluid to the bearings 3c and 3d. As a result, by preventing the support bases 10c and 10d on the low-pressure rotor 2 side from expanding, the bearing alignment on the low-pressure rotor 2 side can be adjusted to reduce the risk of bearing failure.

(Sixth embodiment)
Next, a sixth embodiment will be described.
FIG. 16 is a conceptual diagram illustrating an example of a bearing alignment adjusting device according to the sixth embodiment. In this embodiment, a third example of the alignment adjustment function controlled by the bearing alignment adjustment unit 5d of the computer 5 described in each embodiment will be described.
As shown in FIG. 16, in 6th Embodiment, the heater 13 for heating the bearing stand 11a, 11b which is a support structure of the bearing 3a, 3b by the side of the high intermediate pressure rotor 1 is incorporated. Specifically, the first heater 13a is incorporated into the bearing base 11a, and the second heater 13b is incorporated into the bearing base 11b. The outputs of the heaters 13a and 13b are controlled by the bearing alignment adjustment unit 5d of the computer 5.

  When a control command for increasing the bearing alignment of the bearing 3b is output from the bearing alignment adjusting unit 5d of the computer 5, the second heater 13b operates to heat the bearing base 11b. When this bearing stand 11b is heated and expand | swelled, the bearing alignment of the bearing 3b can be made high. When the bearing alignment adjustment is completed and the control command from the bearing alignment adjustment unit 5d of the computer 5 is stopped, the second heater 13b is stopped. In this way, the bearing alignment can be adjusted to reduce the risk of bearing failure.

(Seventh embodiment)
Next, a seventh embodiment will be described.
FIG. 17 is a conceptual diagram illustrating an example of a bearing alignment adjusting device according to the seventh embodiment. In this embodiment, a fourth example of the alignment adjustment function controlled by the bearing alignment adjustment unit 5d of the computer 5 described in each embodiment will be described.

  As shown in FIG. 17, in 7th Embodiment, the heat exchanger 14 is provided in the support bases 10a-10d which are the support structures of the bearings 3a-3d. Specifically, a first heat exchanger 14a for performing heat exchange with respect to the support base 10a is provided, a second heat exchanger 14b for performing heat exchange with respect to the support base 10b is provided, and heat exchange with respect to the support base 10c is performed. The 3rd heat exchanger 14c for performing is installed, and the 4th heat exchanger 14d for performing the heat exchanger with respect to the support stand 10d is installed. The output of the heat exchanger 14 is controlled by the bearing alignment adjustment unit 5d of the computer 5.

  When a control command for increasing the bearing alignment of the bearing 3b is output by the bearing alignment adjusting unit 5d of the computer 5, the second heat exchanger 14b operates to heat the bearing base 11b and expand. The bearing alignment of the bearing 3b can be increased by expanding the bearing base 11b.

  As described in the fifth embodiment, when a control command for preventing thermal expansion of the support 10 on the low-pressure rotor 2 side is output from the bearing alignment adjustment unit 5d of the computer 5, the heat exchanger 14c , 14d cools the support bases 10c, 10d. By this cooling, the bearing alignment of the bearings 3c and 3d can be adjusted by preventing the support bases 10c and 10d from expanding.

(Eighth embodiment)
Next, an eighth embodiment will be described.
FIG. 18 is a conceptual diagram showing an example of a bearing alignment adjusting device in the eighth embodiment. The alignment adjustment function will be described.
As shown in FIG. 18, in the eighth embodiment, a hydraulic actuator 15 using, for example, a hydraulic jack is installed between each bearing 3 and the support base 10. Specifically, a hydraulic actuator 15a is installed between the bearing 3a and the support 10a, a hydraulic actuator 15b is installed between the bearing 3b and the support 10b, and between the bearing 3c and the support 10c. A hydraulic actuator 15c is installed, and a hydraulic actuator 15d is installed between the bearing 3d and the support 10d. The hydraulic actuator 15 is controlled by the bearing alignment adjustment unit 5 d of the computer 5.

  When a control command for increasing the bearing alignment of the bearing 3b is output from the bearing alignment adjusting unit 5d of the computer 5, the hydraulic actuator 15b operates to increase the bearing alignment of the bearing 3b. When a control command for lowering the bearing alignment on the low-pressure rotor 2 side is output from the bearing alignment adjusting unit 5d of the computer 5, the hydraulic actuators 15c and 15d operate to lower the bearing alignment of the bearings 3c and 3d. Thereby, the bearing alignment of the bearings 3c and 3d can be adjusted.

The function of the bearing alignment adjusting device corresponding to the case where no cold offset is applied to the bearing alignment will be described.
As described above, the hydraulic actuators 15a, 15b, 15c, and 15d are installed on the support bases 10a, 10b, 10c, and 10d, respectively. Instead of the hydraulic actuators 15a, 15b, 15c, 15d, the heat exchanger 14 described in the seventh embodiment may be provided.
If no cold offset is applied to the bearing alignment, there is no need for bearing alignment adjustment because the bearing alignment is ideal during turbine turning.

  When the vacuum rise starts, as described above, the bearing alignment of the bearings 3c and 3d is lowered due to the vacuum load. This change in alignment increases the load on the bearing 3b, so that the bearing metal temperature of the bearing 3b increases and the bearing load increases.

  Therefore, the bearing alignment adjustment unit 5d of the computer 5 outputs a control command for adjusting the bearing alignment of the bearings 3c and 3d upward to the hydraulic actuators 15c and 15d, and this adjustment cancels the bearing alignment change due to the vacuum load. . In the start-up process of the turbine, the bearing and the support structure are heated and expanded due to various factors, and the bearing alignment is changed upward.

  The bearing alignment adjustment unit 5d of the computer 5 monitors the change in the bearing alignment based on the bearing metal temperature or the bearing load, and adjusts the bearing alignment so as to cancel the change in the bearing alignment.

  For example, generally, the change in the bearing alignment due to the thermal expansion of the support 10b of the bearing 3b is large from the start of the turbine to the time when the rated load operation is reached. Therefore, when the bearing load of the bearing 3b starts to rise, the bearing alignment adjusting unit 5d of the computer 5 lowers the bearing alignment of the bearing 3b downward by the hydraulic actuator 15.

  Or the bearing alignment adjustment part 5d prevents the thermal expansion of this support stand 10b by cooling the support stand 10b with the 2nd heat exchanger 14b. In this manner, by canceling the alignment change of the bearing 3 due to thermal expansion in each bearing 3, it is not necessary to apply a cold offset.

  As shown in the eighth embodiment, it is not necessary to apply a cold offset by canceling the alignment change of the bearing 3 during the turbine stop, turning, vacuum rise, turbine start-up, and turbine rated load operation. For this reason, the risk of bearing failure in the turbine low-speed rotation region can be reduced.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... High and medium pressure rotor, 2 ... Low pressure rotor, 3 ... Bearing, 4 ... Temperature sensor, 5 ... Computer, 6 ... Pressure sensor, 7 ... Low pressure casing, 8 ... Condenser, 9 ... Pressure gauge, 10 ... Support stand, DESCRIPTION OF SYMBOLS 11 ... Bearing stand, 12 ... Flow control valve, 13 ... Heater, 14 ... Heat exchanger, 15 ... Hydraulic actuator.

Claims (9)

A bearing alignment adjusting device for adjusting a bearing alignment of a rotor bearing,
A temperature measuring unit for measuring the temperature of the metal of the bearing;
A bearing alignment adjusting device comprising: a bearing alignment adjusting unit that adjusts the bearing alignment by adjusting a vertical height of the bearing so that the measured temperature is within a predetermined target value. A bearing alignment adjusting device for adjusting a bearing alignment of a rotor bearing,
A pressure sensor for measuring the bearing load of each bearing;
A bearing alignment adjustment device comprising: a bearing alignment adjustment unit that adjusts the bearing alignment by adjusting a vertical height of the bearing so that the measured bearing load is within a predetermined target value. A bearing alignment adjusting device for adjusting a bearing alignment of a bearing of a rotor including a low-pressure rotor,
A condenser provided in a casing of the low-pressure rotor;
A measuring unit for measuring the vacuum degree of the condenser;
A bearing alignment adjustment unit comprising a bearing alignment adjustment unit that adjusts the bearing alignment by adjusting a vertical height of the bearing until the measured degree of vacuum rises to a predetermined target value. apparatus. Piping through which the heated fluid flows through the bearing support structure;
A flow rate adjusting valve installed in the pipe for adjusting the flow rate of the heating fluid;
The bearing alignment adjustment unit is
Controlling the flow rate of the heating fluid flowing through the piping in the support structure by controlling the opening and closing of the flow rate regulating valve, thereby heating and expanding the support structure to adjust the vertical height of the bearing. The bearing alignment adjusting device according to claim 1, wherein the bearing alignment is adjusted by the operation. Piping for flowing cooling fluid through the bearing support structure;
A flow rate adjusting valve installed in the pipe for adjusting the flow rate of the cooling fluid;
The bearing alignment adjustment unit is
The bearing alignment is adjusted by adjusting the vertical height of the bearing by controlling the flow rate of the cooling fluid flowing through the piping in the support structure by controlling the opening and closing of the flow control valve. The bearing alignment adjusting device according to any one of claims 1 to 3. A heater for heating the bearing support structure;
The bearing alignment adjustment unit is
4. The bearing alignment is adjusted by adjusting the vertical height of the bearing by controlling the output of the heater to heat and expand the support structure. The bearing alignment adjusting device as described. A heat exchanger for exchanging heat with the bearing support structure;
The bearing alignment adjustment unit is
The bearing alignment is adjusted by adjusting the vertical height of the bearing by controlling the output of the heat exchanger to heat and expand the support structure. The bearing alignment adjusting device according to claim 1. A hydraulic actuator installed on the bearing support structure;
The bearing alignment adjustment unit is
4. The bearing alignment adjusting device according to claim 1, wherein the bearing alignment is adjusted by adjusting a vertical height of the bearing by controlling the hydraulic actuator. 5. A method applied to a bearing alignment adjusting device for adjusting a bearing alignment of a bearing of a rotor,
Measure the metal temperature of the bearing,
The bearing alignment adjustment method, wherein the bearing alignment is adjusted by adjusting a vertical height of the bearing so that the measured temperature is within a predetermined target value.

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