JP6788135B2 - Axial center position control device, rotary mechanical system, axial center position control method and program - Google Patents

Description

The present invention relates to an axial center position control device, a rotary mechanical system, an axial center position control method and a program.

One of the bearings that support the rotary shaft in the horizontal shaft type rotary machine is a journal bearing that slidably supports the rotary shaft. In particular, in large rotating machines such as horizontal shaft type turbines, generators, and electric motors, a method of supplying lubricating oil to bearings to slidably support the rotating shaft is generally used (see Patent Document 1). ).
For example, a pad-type journal bearing device having excellent alignment and vibration stability is often used for a bearing that supports a large rotating shaft. Further, for example, a load bitein type pad type journal bearing device (LBP bearing) is used for the purpose of sharing the load of the rotating shaft with the lower two pads to increase the surface pressure.

Japanese Unexamined Patent Publication No. 1-227804

In a road-bituin type pad bearing, depending on the position of the axis (center of the axis), the area where vibration damping is relatively easy to obtain and the axis system is stable, and the area where vibration damping is relatively difficult to obtain and the shaft system becomes unstable. There is an easy area. It is conceivable that the shaft system is located in a region where the shaft system tends to become unstable due to the movement of the shaft center due to factors such as the force acting on the shaft. If the shaft center is located in a region where vibration damping is relatively difficult to obtain and the shaft system becomes unstable, the reliability of the entire device may be affected.

With a relatively heavy shaft, the bearing surface pressure is relatively large, and it is conceivable that such changes in bearing dynamic characteristics are not so problematic. However, with a relatively lightweight shaft, the bearing surface pressure is relatively small, and the bearing Changes in dynamic characteristics can have a significant effect on shaft stability.
In addition, even in a gear drive compressor having a relatively lightweight shaft, the magnitude and direction of the bearing load acting on the bearing may change due to the meshing state of the gears, which may affect the stability of the shaft system. is there.

The present invention provides an axial center position control device, a rotary mechanical system, an axial center position control method and a program capable of reducing the possibility of the axial system becoming unstable.

According to the first aspect of the present invention, the axial center position control device is an axial center position control device of a rotating machine that slidably supports the rotating shaft with a bearing pad via lubricating oil, and is input from a sensor. The axial center position of the rotating shaft is estimated based on the state quantity of the rotating shaft, and the estimated axial center position and the axial center position obtained from the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference is greater than or equal to a predetermined value, the axial center position is positioned upward based on the axial center position estimation unit that suppresses the output of the estimated position and the axial center position estimated by the axial center position estimation unit. It is a refueling temperature setting unit that sets the refueling temperature so that the refueling temperature becomes higher as it goes, and outputs the refueling temperature set in the temperature adjusting unit that can adjust the temperature of the lubricating oil, and the axial center position is the axis. When it is determined that the system is included in the unstable region set as the region where the system becomes unstable, the refueling temperature is included so that the axial center position is included in the stable region set as the region where the shaft system is stable. It is equipped with a refueling temperature setting unit for setting.

When the refueling temperature setting unit determines that the axial center position is included in an intermediate region set as an intermediate region between the stable region and the unstable region, the axial center position is set to the stable region. The refueling temperature may be set so as to be included.

The axis position estimation unit determines the axis position in both the vertical direction and the horizontal direction orthogonal to the rotation axis based on the values measured by the two displacement sensors that measure the displacement of the rotation axis in different directions. May be estimated.

When the refueling temperature setting unit determines that the oil film temperature in the bearing exceeds the upper limit value based on the set value of the refueling temperature, the refueling temperature may be changed to a lower refueling temperature.

The sensor may include a shaft vibration sensor.

According to the second aspect of the present invention, the rotary machine system includes a rotary machine that slidably supports the rotary shaft with a bearing pad via lubricating oil, and an axial center position that controls the axial center position of the rotary machine. A rotating mechanical system including a control device, wherein the axial center position control device estimates the axial center position of the rotating shaft based on a state quantity of the rotating shaft input from a sensor, and the estimated axial center is estimated. When the magnitude of the difference between the position and the axial center position obtained from the measured value of the thermocouple that measures the temperature of the bearing metal is greater than or equal to a predetermined value, the axial center position estimating unit that suppresses the output of the estimated position and the above-mentioned Based on the axial center position estimated by the axial center position estimation unit, the refueling temperature is set so that the refueling temperature becomes higher as the axial center position is located higher, and the temperature of the lubricating oil can be adjusted. When the refueling temperature setting unit that outputs the refueling temperature set in is determined that the axial center position is included in the unstable region set as the region where the shaft system becomes unstable, the axial center position However, the refueling temperature setting unit for setting the refueling temperature so as to be included in the stable region set as the stable region of the shaft system is provided.

According to the third aspect of the present invention, the axial center position control method is an axial center position control method of a rotating machine that slidably supports the rotating shaft with a bearing pad via lubricating oil, and is input from a sensor. The axial center position of the rotating shaft is estimated based on the state quantity of the rotating shaft, and the estimated axial center position and the axial center position obtained from the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference between the two is greater than or equal to a predetermined value, the axial center position is moved upward based on the axial center position estimation step that suppresses the output of the estimated position and the axial center position estimated in the axial center position estimation step. It is a refueling temperature setting step in which the refueling temperature is set so that the refueling temperature becomes higher as the position is located, and the refueling temperature set in the temperature adjusting unit capable of adjusting the temperature of the lubricating oil is output. When it is determined that the shaft system is included in the unstable region set as the unstable region, the refueling is performed so that the axial center position is included in the stable region set as the stable region of the shaft system. It has a refueling temperature setting step, which sets the temperature.

According to a fourth aspect of the present invention, the program is the rotation input from a sensor to a computer that controls the axial position of a rotating machine that slidably supports the rotating shaft by bearing pads via lubricating oil. The axial center position of the rotating shaft is estimated based on the state quantity of the shaft, and the difference between the estimated axial center position and the axial center position obtained from the measured value of the thermocouple for measuring the temperature of the bearing metal is large. When is greater than or equal to a predetermined value, refueling is performed so that the axial center position is located upward, based on the axial center position estimation step that suppresses the output of the estimated position and the axial center position estimated in the axial center position estimation step. It is a refueling temperature setting step that sets the refueling temperature so that the temperature becomes high and outputs the refueling temperature set in the temperature adjusting unit that can adjust the temperature of the lubricating oil, and the axial center position is not the shaft system. When it is determined that the fuel is included in the unstable region set as the stable region, the refueling temperature is set so that the axial center position is included in the stable region set as the stable region of the shaft system. It is a program for executing the refueling temperature setting step.

According to the shaft center position control device, the rotary mechanical system, the shaft center position control method and the program described above, the possibility of the shaft system becoming unstable can be reduced.

It is a schematic block diagram which shows the functional structure of the steam turbine system in one Embodiment of this invention. It is explanatory drawing which shows the example in which the axis of the rotor of the steam turbine in the same embodiment is in a stable region. It is explanatory drawing which shows the example in which the axis of the rotor of the steam turbine in the same embodiment is in an unstable region. It is explanatory drawing which shows the example of the state in which the fluid force acting on the shaft in the same embodiment is biased. It is the schematic which shows the example of the positional relationship of each part when the installation position of the displacement sensor in the same embodiment is seen from the side of the steam turbine. It is the schematic which shows the example of the positional relationship of each part when the installation position of the displacement sensor in the same embodiment is seen from the axial direction of the rotor of a steam turbine. It is explanatory drawing which shows the arrangement example of the bearing metal which the thermocouple measures the temperature in the same embodiment. It is explanatory drawing which shows the example of the processing procedure of the lubricating oil supply to the bearing performed by the steam turbine system in the same embodiment. In the same embodiment, it is explanatory drawing which shows the example of the processing procedure of the lubricating oil supply to the bearing performed by the steam turbine system when the oil film temperature is limited. It is a schematic diagram which shows another example of the positional relationship of each part when the installation position of the displacement sensor in the same embodiment is seen from the axial direction of the rotor of a steam turbine. It is a schematic diagram which shows another example of the positional relationship of each part when the installation position of the displacement sensor in the same embodiment is seen from the axial direction of the rotor of a steam turbine.

Hereinafter, embodiments of the present invention will be described, but the following embodiments do not limit the inventions in the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.
FIG. 1 is a schematic block diagram showing a functional configuration of a steam turbine system according to an embodiment of the present invention. In the figure, the steam turbine system 1 includes an axial center position control device 100, a lubricating oil supply device 200, and a steam turbine 300. The axis center position control device 100 includes an axis center position estimation unit 110 and a refueling temperature setting unit 120. The lubricating oil supply device 200 includes a temperature adjusting unit 210 and a lubricating oil supply unit 220. The steam turbine 300 includes a displacement sensor 311 and a thermocouple 312.

The steam turbine 300 generates rotational force by rotating the rotor with steam supplied from the boiler. The steam turbine 300 corresponds to an example of a rotating machine, and the rotating shaft of the rotor is slidably supported by a bearing metal via a lubricating oil supplied by the lubricating oil supply device 200. The rotating shaft of the rotor of the steam turbine 300 is simply referred to as a "shaft".

Here, the stability of the shaft system in the steam turbine 300 will be described with reference to FIGS. 2 to 3.
FIG. 2 is an explanatory diagram showing an example in which the axis of the rotor of the steam turbine 300 is in the stable region. In the figure, among the steam turbines 300, a bearing 321 provided with a bearing metal 322 to 1322-4 and a shaft 331 of a rotor 330 are shown. Bearing metals 211-1 to 222-4 correspond to the example of bearing pads.
Further, in FIG. 2, a stable region A11, an intermediate region A12, and an unstable region A13 are shown, and a point P11 indicates an axial center of the shaft 331.

The stable region A11 is a region indicating the position of the axial center where the axial system of the rotor 330 is stable. In the example of FIG. 2, the axis indicated by the point P11 is located in the stable region A11. In this case, it is relatively easy to obtain the damping of the vibration of the shaft 331, and the shaft system of the rotor 330 is stabilized.
On the other hand, the unstable region A13 is a region indicating the position of the axial center where the axial system of the rotor 330 becomes unstable. When the axis of the rotor 330 is located in the unstable region A13, it is relatively difficult to obtain the damping of the vibration of the shaft 331, and the shaft system of the rotor 330 becomes unstable.

The intermediate region A12 is an intermediate region between the stable region A11 and the unstable region A13. When the axis of the rotor 330 is located in the intermediate region A12, it is easier to obtain the damping of the vibration of the shaft 331 than when the axis of the rotor 330 is located in the unstable region A13. On the other hand, when the axis of the rotor 330 is located in the intermediate region A12, it can be said that the axis is relatively close to the unstable region A13. In this respect, the intermediate region A12 is a region that requires attention to prevent the shaft system of the rotor 330 from becoming unstable.

The manufacturer or manager of the steam turbine system 1 determines the unstable region A13 in advance from, for example, the analysis result of the steam turbine 300 or the past measurement result (for example, maintenance / inspection record or test data of the steam turbine 300). It is set and stored in the refueling temperature setting unit 120. Then, the manufacturer or the manager of the steam turbine system 1 sets the intermediate region A12 in the vicinity of the unstable region A13 in advance and stores it in the refueling temperature setting unit 120.

FIG. 3 is an explanatory diagram showing an example in which the axial center of the rotor of the steam turbine 300 is in an unstable region. Similar to the case of FIG. 2, in FIG. 3, of the steam turbine 300, the bearing 321 provided with the bearing metal 322-13 to 222-4 and the shaft 331 are shown. Further, in FIG. 3, a stable region A11, an intermediate region A12, and an unstable region A13 are shown, and a point P11 indicates an axial center of the shaft 331.
Unlike the case of FIG. 2, in the example of FIG. 3, the axis indicated by the point P11 is located in the unstable region A13. In this case, as described above, it is relatively difficult to obtain the damping of the vibration of the shaft 331, and the shaft system of the rotor 330 becomes unstable.

Next, an example of a factor that changes the position of the shaft 331 will be described with reference to FIG.
FIG. 4 is an explanatory diagram showing an example of a state in which the fluid force acting on the shaft 331 is biased. In the figure, the outline of the cross section of the passenger compartment of the steam turbine 300 as viewed from the axial direction is shown, and the outer circumference (casing) of the stator 340, the rotor shaft 331 and the moving blades 332 are shown. The point P11 indicates the axis.

Further, FIG. 4 shows an example in which the steam turbine 300 is a steam turbine that performs partial injection. The partial injection referred to here is a method of adjusting the amount of steam inflow according to the degree of opening and closing of the valve for each nozzle mounted in the circumferential direction when steam is inserted into the turbine. In the example of FIG. 4, arrows R11 to R14 indicate an example of the steam injection direction from the nozzle, respectively, and R11 to R13 indicate a state in which steam is injected. On the other hand, R14 indicates a state in which steam is not injected. It is conceivable that the fluid force acting on the shaft 331 is biased due to the difference in the presence or absence of steam injection between the directions of R11 to R13 and the direction of R14, and the axis (point P11) moves due to this bias.

As described above, in the steam turbine that performs partial injection, the fluid force acting on the shaft is biased due to the difference in the amount of steam inflow from each direction, and the force that changes the shaft in a certain radial direction may be generated accordingly. Due to this force, it is considered that the axis is located in an unstable region where it is difficult to obtain vibration damping. If the shaft center is located in a region where vibration damping is relatively difficult to obtain and the shaft system becomes unstable, the reliability of the entire device may be affected.
Therefore, in the steam turbine system 1, as will be described later, the shaft center position control device 100 controls the position of the shaft center of the rotor of the steam turbine 300 by controlling the temperature of the lubricating oil supplied to the bearing 321.

The displacement sensor 311 measures a change in the position of the shaft (shaft displacement). Specifically, the displacement sensor 311 measures the change in the distance between the displacement sensor 311 itself and the shaft 331. As the displacement sensor 311 for example, a shaft vibrometer can be used. The axial center position of the shaft 331 can be estimated by extracting the necessary frequency component from the measured value of the shaft vibration by the shaft vibrometer. Specifically, the measured value of the displacement sensor 311 is passed through a low-pass filter to remove high frequencies (rotation speed components, etc.) to obtain the measured value of the displacement of the shaft 331.

Here, an example of the installation position of the displacement sensor 311 will be described with reference to FIGS. 5 and 6.
FIG. 5 is a schematic view showing an example of the positional relationship of each part when the installation position of the displacement sensor 311 is viewed from the side of the steam turbine 300 (from the direction perpendicular to the longitudinal direction of the shaft 331). In the example of the figure, the shaft 331 is arranged over the bearing box 323 and the passenger compartment 341. Further, a bearing 321 is arranged in the bearing box 323 to support the shaft 331. Further, a baffle plate 351 is provided between the bearing box 323 and the passenger compartment 341, and an L-shaped jig 352 is attached to the baffle plate 351 to install a displacement sensor 311. The displacement sensor 311 is installed toward the shaft 331 (for example, in the radial direction of the shaft 331 so as to measure a change in the distance between the displacement sensor 311 itself and the shaft 331).

FIG. 6 is a schematic view showing an example of the positional relationship of each part when the installation position of the displacement sensor 311 is viewed from the axial direction of the rotor of the steam turbine 300. In the example of the figure, the displacement sensor 311 is installed by attaching the L-shaped jig 352 to the baffle plate 351. The displacement sensor 311 is installed toward the shaft 331.
Here, the two displacement sensors 311 measure the displacement of the shaft 331 in different directions (directions orthogonal to each other in the example of FIG. 6). By using the values measured by these two displacement sensors 311 it is possible to estimate the position of the axis center in both the vertical direction and the horizontal direction orthogonal to the axis 331. As a result, even when the stable region A11 or the like has a relatively complicated shape as in the example of FIG. 2, it is possible to determine in which region the axis is included.
However, the displacement sensor 311 may measure the displacement of the shaft 331 only in the vertical direction. In this case, the axial center position estimation unit 110 stores in advance the correspondence between the vertical position of the shaft 331 and the refueling temperature, and sets the refueling temperature according to the vertical position of the shaft 331.

The installation position of the displacement sensor 311 is not limited to the position described with reference to FIGS. 5 and 6. The displacement sensor 311 may be installed at a position where the displacement of the shaft 331 can be measured. On the other hand, by installing the displacement sensor 311 on the baffle plate 351, it is possible to easily tighten the installation screws and remove the displacement sensor 311.

The thermocouple 312 measures the temperature of the bearing metal 322.
FIG. 7 is an explanatory view showing an arrangement example of the bearing metal 322 in which the thermocouple 312 measures the temperature. In the figure, of the steam turbine 300, a bearing 321 provided with a bearing metal 322 to 1322-4 and a shaft 331 are shown. The thermocouple 312 measures the temperature of the lower bearing metal 322-3 and the temperature of the bearing metal 322-4 among these four bearing metals 322 to 1322-4.
When the shaft 331 sinks, the temperature of the bearing metal 322-3 located below the shaft 331 and the temperature of the bearing metal 322-4 rise, and so on, between the temperature of the bearing metal and the position of the shaft 331. Is correlated. Therefore, the position of the axis can be estimated based on the value measured by the thermocouple 312.

Both the displacement sensor 311 and the thermocouple 312 correspond to the example of the sensor in the steam turbine system 1. Further, the measured value by the displacement sensor 311 and the measured value by the thermocouple 312 correspond to the example of the state quantity of the shaft 331.
However, the sensor included in the steam turbine 300 is not limited to the combination of the displacement sensor 311 and the thermocouple 312, and may be any sensor that can obtain a measured value capable of estimating the position of the axis.

For example, the steam turbine 300 may include a distance sensor and measure the distance between the distance sensor and the shaft 331. Similar to the example of FIG. 6, the steam turbine 300 is provided with a plurality of distance sensors and measures the distance between the distance sensor and the shaft 331 in a plurality of directions in both the vertical direction and the horizontal direction orthogonal to the shaft 331. , The position of the axis can be estimated.
Alternatively, the steam turbine 300 may include only one of the thermocouple 312 and the displacement sensor 311. On the other hand, when the steam turbine 300 is provided with the thermocouple 312 and the displacement sensor 311, the position of the axis can be estimated with higher accuracy than when only one of them is provided.

The axial center position control device 100 is a lubricating oil supply device 200 based on the measured values of the displacement of the shaft 331 by the displacement sensor 311 and the measured values of the temperatures of the bearing metals 322-3 and 322-4 by the thermocouple 312. Controls the temperature of the lubricating oil supplied to the bearing 321.
The axial center position estimation unit 110 estimates the axial center position of the shaft 331 based on the measured value input from the displacement sensor 311 and the measured value input from the thermocouple 312.

For example, the axial center position estimation unit 110 estimates the axial center position of the shaft 331 by extracting a predetermined frequency component from the shaft vibration measured by the displacement sensor 311 as described above. Further, the axial center position estimation unit 110 converts the temperature of the bearing metal 322-3 and the temperature of the bearing metal 322-4 measured by the thermocouple 312 into the axial center position of the shaft 331. For example, by storing a table showing the correspondence between the temperature measurement value by the thermocouple 312 and the position of the shaft 331 in advance and reading the value corresponding to the temperature measurement value acquired from the thermocouple 312 from the table, the shaft 331 Find the axial position of.

The axial center position estimation unit 110 determines the estimated axial center position based on the axial center position obtained from the measured value of the displacement sensor 311 and the axial center position obtained from the measured value of the thermocouple 312. For example, the axial center position estimation unit 110 weights the coordinates of the axial center position obtained from the measured value of the displacement sensor 311 and the coordinates of the axial center position obtained from the measured value of the thermocouple 312 with a predetermined weight. The coordinates obtained by averaging are used as the estimated positions of the axis.

However, the method for determining the estimated position of the axial center by the axial center position estimation unit 110 is not limited to the method based on the weighted average, and various methods can be used. For example, the axial center position estimation unit 110 determines the axial center position obtained from the measured value of the displacement sensor 311 as the estimated axial center position, and confirms the axial center position obtained from the measured value of the thermocouple 312. It may be used as. For example, the axial center position estimation unit 110 obtains the difference between the axial center position obtained from the measured value of the displacement sensor 311 and the axial center position obtained from the measured value of the thermocouple 312, and determines the magnitude of the difference. If it is greater than or equal to the value, it may be determined that the estimation of the axial center position has failed and the output of the estimated position may be suppressed.

In the lubrication temperature setting unit 120, the lubricating oil supply device 200 bearings the lubrication oil supply device 200 so that the lubrication temperature becomes higher (larger) as the axial center position is located higher, based on the axial center position estimated by the axial center position estimation unit 110. The lubrication temperature of the lubricating oil supplied to 321 is set. Then, the refueling temperature setting unit 120 outputs (transmits) information indicating the set refueling temperature to the temperature adjusting unit 210 of the lubricating oil supply device 200.

For example, the refueling temperature setting unit 120 stores in advance a table showing the correspondence between the axial center position and the refueling temperature, and reads out the refueling temperature corresponding to the axial center position estimated by the axial center position estimation unit 110 from the table. By doing so, the refueling temperature is set. The table is obtained by, for example, the manufacturer or manager of the steam turbine system 1 by analysis or test, and is stored in advance in the refueling temperature setting unit 120.

Here, there is a correlation between the temperature of the lubricating oil and the position (particularly the height) of the shaft 331, and the higher the temperature of the lubricating oil, the lower the position of the shaft 331 (the position becomes lower). .. It is considered that when the oil film temperature of the bearing 321 rises, the viscosity of the oil film decreases, the force supporting the shaft weakens, and the shaft sinks. On the contrary, when the oil film temperature of the bearing 321 becomes low, the viscosity of the oil film increases, the force supporting the shaft becomes strong, and it is considered that the sinking of the shaft is suppressed.
Therefore, when the position of the shaft 331 is high (positioned above), the refueling temperature setting unit 120 controls to lower the position of the shaft 331 by setting the refueling temperature high. On the other hand, when the position of the shaft 331 is low, the refueling temperature setting unit 120 controls to raise the position of the shaft 331 by setting the refueling temperature low (small).

The lubricating oil supply device 200 supplies the lubricating oil to the bearing 321. At that time, the lubricating oil supply device 200 heats or cools the lubricating oil so as to supply the lubricating oil at the refueling temperature set by the refueling temperature setting unit 120.
The temperature adjusting unit 210 has a heating function and a cooling function, for example, including a heater and a cooler, and heats or cools the lubricating oil so as to reach the refueling temperature set by the refueling temperature setting unit 120. Alternatively, the lubricating oil is cooled by natural cooling, and the temperature adjusting unit 210 only heats the lubricating oil so that the temperature of the lubricating oil is adjusted to the temperature set by the refueling temperature setting unit 120 (refueling temperature). It may be.

The lubricating oil supply unit 220 supplies the temperature-adjusted lubricating oil to the bearing 321 by the temperature adjusting unit 210. For example, the lubricating oil supply unit 220 and the bearing 321 are connected by a lubrication pipe, and the lubricating oil supply unit 220 supplies the lubricating oil to the bearing 321 by outputting the lubricating oil to the lubrication pipe with a pump. ..

Next, the operation of the steam turbine system 1 will be described with reference to FIG.
FIG. 8 is an explanatory diagram showing an example of a procedure for supplying lubricating oil to the bearing 321 performed by the steam turbine system 1. The steam turbine system 1 repeats the process shown in the figure when the steam turbine 300 is in operation.
In the process of FIG. 8, the axial center position estimation unit 110 acquires the measured value of the displacement of the shaft 331 measured by the displacement sensor 311 (step S101). Further, the axial center position estimation unit 110 acquires the measured values of the temperatures of the bearing metals 322-3 and 322-4 measured by the thermocouple 312 (step S102).
Then, the axial center position estimation unit 110 is based on the measured value of the displacement of the shaft 331 obtained in step S101 and the measured value of the respective temperatures of the bearing metals 322-3 and 322-4 obtained in step S102. , The axial center position of the shaft 331 is estimated (step S103).

Next, the refueling temperature setting unit 120 determines whether or not the axial center is approaching the unstable region A13 based on the axial center position estimated by the axial center position estimation unit 110 in step S103 (step S104). Specifically, the refueling temperature setting unit 120 determines whether or not the axial center position is included in the intermediate region A12 or the unstable region A13.
When it is determined that the axis is approaching the unstable region A13 (step S104: YES), the refueling temperature setting unit 120 sets the refueling temperature so that the axis is included in the stable region A11 (step S105). .. Specifically, as described above, when the axial center position obtained in step S103 is at a high position, the refueling temperature setting unit 120 sets the refueling temperature high. On the other hand, when the axial center position obtained in step S103 is at a low position, the refueling temperature setting unit 120 sets the refueling temperature low.

Next, the temperature adjusting unit 210 adjusts the lubrication temperature of the lubricating oil to the bearing 321 (step S107). Specifically, the temperature adjusting unit 210 heats or cools the lubricating oil so that the lubrication temperature of the lubricating oil to the bearing 321 becomes the lubrication temperature set by the lubrication temperature setting unit 120.
Then, the lubricating oil supply unit 220 supplies the lubricating oil whose temperature has been adjusted by the temperature adjusting unit 210 to the bearing 321 (step S108). Lubricating oil is supplied, for example, to bearing metals 322-3 and 322-4 that support the load of the shaft 331. In addition to controlling the vertical position of the shaft 331, the lubricating oil supply unit 220 controls the amount of lubricating oil supplied to the bearing metal 322-3 and the amount of lubricating oil supplied to the bearing metal 322-4, respectively. By doing so, the position of the shaft 331 in the horizontal direction (position in the left-right direction in FIG. 8) may be controlled.
After step S108, the process of FIG. 8 ends.

On the other hand, when it is determined in step S104 that the axis is not close to the unstable region A13 (step S104: NO), the refueling temperature setting unit 120 holds the current refueling temperature set value (step S106). As a result, the refueling temperature setting unit 120 controls the position of the shaft 331 so that the shaft 331 maintains the current position.
After step S106, the process proceeds to step S107.

As described above, the axial center position estimation unit 110 estimates the axial center position of the shaft 331 based on the sensor measurement values input from the displacement sensor 311 and the thermocouple 312, respectively. Then, the refueling temperature setting unit 120 sets the refueling temperature so that the refueling temperature becomes higher as the axial center position is located higher, based on the axial center position estimated by the axial center position estimation unit 110, and the set refueling temperature is set. The temperature is output to the temperature adjusting unit 210.
As a result, the refueling temperature setting unit 120 controls the axial center position of the shaft 331 so as to lower the axial center position when the axial center position is high and raise the axial center position when the axial center position is low. Can be done. In this respect, the refueling temperature setting unit 120 can control the axial center position so that the axial center of the shaft 331 is located in the stable region A11, and can reduce the possibility that the axial system becomes unstable. ..

The rotary machine in which the shaft center position control device 100 controls the shaft center position is not limited to the steam turbine described above, and the shaft center position can be estimated, and the position of the shaft center changes depending on the temperature of the lubricating oil. It may be a rotating machine. For example, the shaft center position control device 100 may control the shaft center position of a rotating machine other than the steam turbine, such as a gas turbine, a generator, or an electric motor.

In addition to adjusting the refueling temperature based on the position of the shaft 331, the steam turbine system 1 may limit the oil film temperature so that it does not exceed the upper limit value. The upper limit of the oil film temperature is set in advance to, for example, 100 degrees (° C.) based on, for example, the upper limit temperature of the bearing metals 322-3 to 322-4.
FIG. 9 is an explanatory diagram showing an example of a procedure for supplying lubricating oil to the bearing 321 performed by the steam turbine system 1 when the oil film temperature is limited. When the steam turbine 300 is in operation, the steam turbine system 1 repeats the process of FIG. 9 instead of the process of FIG.

Steps S201 to S206 of FIG. 9 are the same as steps S101 to S106 of FIG.
After step S205 and after step S206, the refueling temperature setting unit 120 determines whether or not the set refueling temperature exceeds the upper limit of the oil film temperature in the bearing 321 (step S211).

When it is determined that the upper limit value of the oil film temperature is exceeded (step S211: YES), the refueling temperature setting unit 120 resets the refueling temperature (step S212). Specifically, the set value of the refueling temperature is lowered so that the oil film temperature becomes equal to or lower than the upper limit value. After step S212, the process proceeds to step S213.
Steps S213 to S214 are the same as steps S107 to S108 of FIG.
After step S214, the process of FIG. 9 ends.
On the other hand, if it is determined in step S211 that the upper limit of the oil film temperature is not exceeded (step S211: NO), the process proceeds to step S213.

As described above, when the refueling temperature setting unit 120 determines that the oil film temperature in the bearing 321 exceeds the upper limit value based on the refueling temperature set value, it changes to a lower refueling temperature.
As a result, the steam turbine system 1 can control the position of the shaft 331 and control the oil film temperature to be equal to or lower than the upper limit value. By controlling the position of the shaft 331, the possibility that the shaft system becomes unstable can be reduced. Further, by setting the oil film temperature to be equal to or lower than the upper limit value, it is possible to suppress the progress of damage and deterioration of the bearing 321 and the shaft.
In addition, instead of the refueling temperature setting unit 120, the temperature adjusting unit 210 may perform a process of adjusting the temperature of the lubricating oil so as not to exceed the upper limit value of the oil film temperature. Alternatively, the steam turbine system 1 may further include a device for adjusting the temperature of the lubricating oil so as not to exceed the upper limit of the oil film temperature.

As one of the displacement sensors 311 may use a shaft vibrometer installed for monitoring the vibration of the shaft 331.
FIG. 10 is a schematic view showing another example of the positional relationship of each part when the installation position of the displacement sensor 311 is viewed from the axial direction of the rotor of the steam turbine 300.
In the example of FIG. 10, the displacement sensor 311-1 is shown, which is different from the example of FIG. The displacement sensor 311-1 is installed for monitoring the vibration of the shaft 331. As the displacement sensor 311-1, for example, an axial vibrometer that measures the axial vibration of the shaft 331 in the vertical direction can be used.
Further, a dedicated sensor for outputting the measured value of the displacement of the shaft 331 to the axial center position control device 100 is referred to as a displacement sensor 311-2. The displacement sensor 311-2 is installed at a position and orientation for measuring the displacement of the shaft 331 in a direction different from that of the displacement sensor 311-1.

As described above, the displacement sensor 311-1 installed for the vibration monitoring of the shaft 331 is used as the sensor that outputs the measured value of the displacement of the shaft 331 to the shaft center position control device 100. As a result, the manufacturing cost of the steam turbine system 1 can be reduced as compared with the case where all the sensors that output the measured value of the displacement of the shaft 331 to the axial center position control device 100 are dedicated sensors.

When an axial vibrometer installed for monitoring the vibration of the shaft 331 is used as one of the displacement sensors 311, a dedicated sensor (displacement) that outputs the measured value of the displacement of the shaft 331 to the axial center position control device 100. The number of sensors 311-2) may be one or a plurality.
FIG. 11 is a schematic view showing another example of the positional relationship of each part when the installation position of the displacement sensor 311 is viewed from the axial direction of the rotor of the steam turbine 300.

In the example of FIG. 11, the orientation of the displacement sensor 311-2 is different from that of the example of FIG. In FIG. 11, two displacement sensors 311-2 are installed facing each other in the radial direction of the shaft 331 so as to measure the horizontal displacement of the shaft 331, respectively. The axial center position estimation unit 110 acquires measured values of the displacement of the shaft 331 from a total of three displacement sensors 311 of the displacement sensor 311-1 of FIG. 10 and the two displacement sensors 311-2 of FIG. ..
As a result, the axial center position estimation unit 110 can obtain the measured value of the displacement of the axis 331 in different directions, and as in the case of FIG. 6, the axial center position is obtained in both the vertical direction and the horizontal direction orthogonal to the axis 331. The position of can be estimated. As a result, even when the stable region A11 or the like has a relatively complicated shape as in the example of FIG. 2, it is possible to determine in which region the axis is included.

Further, the axial center position estimation unit 110 can detect thermal expansion and the like of the shaft 331 by using the measured values from the two displacement sensors 311-2 installed so as to face each other in the radial direction of the shaft 331. Specifically, when the measured values from the two displacement sensors 311-2 both indicate that the shaft 331 is close to the displacement sensor 311-2, the axial center position estimation unit 110 determines the shaft 331. Can be determined to have expanded. Then, the axial center position estimation unit 110 can obtain the size of the expansion of the shaft 331 by summing the distance that the shaft 331 approaches the displacement sensor 311-2 for the two displacement sensors 311.
On the other hand, when the measured values from the two displacement sensors 311-2 both indicate that the shaft 331 is moving away from the displacement sensor 311-2, the shaft center position estimation unit 110 contracts the shaft 331. Can be determined. Then, the axial center position estimation unit 110 can obtain the size of the contracted shaft 331 by summing the distances of the shaft 331 away from the displacement sensors 311-2 for the two displacement sensors 311.
The axial center position estimation unit 110 detects the expansion and contraction of the shaft 331 and makes a correction by subtracting the expansion or contraction from the measured value of the displacement sensor 311 to more accurately estimate the position of the axial center of the shaft 331. can do.

A program for realizing all or a part of the functions of the axial center position control device 100 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by the computer system and executed. As a result, each part may be processed. The term "computer system" as used herein includes hardware such as an OS and peripheral devices.
In addition, the "computer system" includes a homepage providing environment (or display environment) if a WWW system is used.
Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system. Further, a "computer-readable recording medium" is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. In that case, it also includes the one that holds the program for a certain period of time, such as the volatile memory inside the computer system that becomes the server or client. Further, the above-mentioned program may be a program for realizing a part of the above-mentioned functions, and may be a program for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like within a range not deviating from the gist of the present invention are also included.

1 Steam turbine system 100 Axis position control device 110 Axis position estimation unit 120 Lubrication temperature setting unit 200 Lubricating oil supply device 210 Temperature adjustment unit 220 Lubricating oil supply unit 300 Steam turbine 311 Displacement sensor 312 Thermocouple 321 Bearing 322 Bearing metal 323 Bearing box 330 Rotor 331 Shaft 332 Moving wing 340 Stator 341 Vehicle compartment 351 Baffle plate 352 L-shaped jig

Claims (8)

An axial center position control device for a rotating machine that slidably supports a rotating shaft with a bearing pad via lubricating oil.
The shaft center position is estimated based on the state quantity of the rotating shaft input from the sensor, and the shaft obtained from the estimated shaft center position and the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference from the center position is greater than or equal to the predetermined value, the axial center position estimation unit that suppresses the output of the estimated position and the axial center position estimation unit
Based on the axial center position estimated by the axial center position estimation unit, the refueling temperature is set so that the refueling temperature becomes higher as the axial center position is located higher, and the temperature of the lubricating oil can be adjusted. When it is determined in the refueling temperature setting unit that outputs the refueling temperature set in the unit and the axial center position is included in the unstable region set as the region where the shaft system becomes unstable, the axial center is said. A refueling temperature setting unit that sets the refueling temperature so that the position is included in the stable region set as the region where the shaft system is stable, and
Axial center position control device. When the refueling temperature setting unit determines that the axial center position is included in an intermediate region set as an intermediate region between the stable region and the unstable region, the axial center position is set to the stable region. Set the refueling temperature to be included,
The axial position control device according to claim 1. The axis position estimation unit determines the axis position in both the vertical direction and the horizontal direction orthogonal to the rotation axis based on the values measured by the two displacement sensors that measure the displacement of the rotation axis in different directions. To estimate,
The axial center position control device according to claim 1 or 2. The axial center position according to any one of claims 1 to 3, wherein the refueling temperature setting unit changes to a lower refueling temperature when it determines that the oil film temperature in the bearing exceeds the upper limit value based on the set value of the refueling temperature. Control device. The axial center position control device according to any one of claims 1 to 4, wherein the sensor includes an axial vibration sensor. A rotary machine system including a rotary machine that slidably supports a rotary shaft with a bearing pad via lubricating oil, and an axial center position control device that controls the axial center position of the rotary machine.
The axial position control device is
The shaft center position is estimated based on the state quantity of the rotating shaft input from the sensor, and the shaft obtained from the estimated shaft center position and the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference from the center position is greater than or equal to a predetermined value, the axial center position estimation unit that suppresses the output of the estimated position and
Based on the axial center position estimated by the axial center position estimation unit, the refueling temperature is set so that the refueling temperature becomes higher as the axial center position is located higher, and the temperature of the lubricating oil can be adjusted. When it is determined in the refueling temperature setting unit that outputs the refueling temperature set in the unit and the axial center position is included in the unstable region set as the region where the shaft system becomes unstable, the axial center is said. A refueling temperature setting unit that sets the refueling temperature so that the position is included in the stable region set as the region where the shaft system is stable, and
A rotating mechanical system. It is a method of controlling the axial center position of a rotating machine that slidably supports the rotating shaft with a bearing pad via lubricating oil.
The shaft center position is estimated based on the state quantity of the rotating shaft input from the sensor, and the shaft obtained from the estimated shaft center position and the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference from the center position is greater than or equal to a predetermined value, the axial center position estimation step that suppresses the output of the estimated position and
Based on the axial center position estimated in the axial center position estimation step, the refueling temperature is set so that the refueling temperature becomes higher as the axial center position is located higher, and the temperature of the lubricating oil can be adjusted. In the refueling temperature setting step for outputting the refueling temperature set in the adjusting unit, when it is determined that the axial center position is included in the unstable region set as the region where the shaft system becomes unstable, the shaft The refueling temperature setting step of setting the refueling temperature so that the core position is included in the stable region set as the region where the shaft system is stable, and
Axial center position control method having. For a computer that controls the axial position of a rotating machine that slidably supports the rotating shaft with a bearing pad via lubricating oil.
The shaft center position is estimated based on the state quantity of the rotating shaft input from the sensor, and the shaft obtained from the estimated shaft center position and the measured value of the thermocouple for measuring the temperature of the bearing metal. When the magnitude of the difference from the center position is greater than or equal to a predetermined value, the axial center position estimation step that suppresses the output of the estimated position and the axial center position estimation step
Based on the axial center position estimated in the axial center position estimation step, the refueling temperature is set so that the refueling temperature becomes higher as the axial center position is located higher, and the temperature of the lubricating oil can be adjusted. In the refueling temperature setting step for outputting the refueling temperature set in the adjusting unit, when it is determined that the axial center position is included in the unstable region set as the region where the shaft system becomes unstable, the shaft The refueling temperature setting step of setting the refueling temperature so that the core position is included in the stable region set as the region where the shaft system is stable, and
A program to execute.

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