JP2015068300A - Power generation plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation plant capable of shortening starting time of an emergency oil pump of a lubricant supply device and smoothly stopping a turbine even if a main oil pump malfunctions.SOLUTION: A power generation plant 70 includes: a power generation system 50 including a turbine; and a lubrication oil supply device 60 supplying lubrication oil to a bearing of the turbine. The lubrication oil supply device 60 includes: an oil tank 10 storing the lubrication oil; a main oil pump 14 supplying the lubrication oil stored in the oil tank 10 to the bearing; a plurality of emergency oil pumps 18 supplying the lubrication oil stored in the oil tank 10 to the bearing; a plurality of emergency-oil-pump drive units 19 connected to the respective emergency oil pumps 18; and a DC power supply 33 serving as a drive source of the emergency-oil-pump drive units 19.

Description

  The present invention relates to a power plant.

  In a power plant using a turbine, in order to maintain a lubricating oil film between a turbine rotor and a bearing that supports the turbine, lubricating oil is continuously supplied to the bearing at a pressure higher than a certain level during operation of the turbine. A lubricating oil supply device is generally provided.

  Some power plants of this type include an emergency oil pump in case the main oil pump becomes inoperable in addition to the main oil pump that supplies oil to the bearings during normal operation (see Patent Document 1, etc.).

JP 2000-110992 A

  Generally, the main oil pump is driven by using a part of the power generation output of the power plant as a power source. However, when a turbine trip or the like occurs, a required power generation output cannot be ensured, and the main oil pump decelerates and then stops. A power plant may be constructed in a remote area where AC power (commercial power) cannot be secured, but in locations where AC power can be supplied, a backup main oil pump driven by AC power is installed. There is also a power plant equipped. However, under a situation where the AC power source is lost for some reason, the main oil pump decelerates and then stops with a turbine trip or the like regardless of the presence or absence of the backup main oil pump. In such a case, in order to stop the turbine safely, the pressure of the lubricating oil in the bearing (hereinafter referred to as bearing hydraulic pressure) is constant until the turbine is stopped after the battery-operated emergency oil pump is started. It is necessary to keep above.

  However, in recent years, the capacity of the turbine tends to increase, and accordingly, it may be necessary to supply more lubricating oil to the bearing. Therefore, it is expected that each oil pump used in the lubricating oil supply device and the electric motor that drives the oil pump will be enlarged. Since the emergency oil pump has a longer start-up time if its capacity increases, the decrease in bearing oil pressure due to the deceleration of the main oil pump cannot be suppressed and the lubricating oil film between the turbine rotor and the bearing is stopped until the turbine stops. May not be able to be maintained.

  The present invention has been made in view of the above circumstances, and can shorten the start-up time of the emergency oil pump of the lubricating oil supply device and smoothly stop the turbine even when the main oil pump becomes inoperable. An object is to provide a power plant.

  In order to achieve the above object, the present invention includes a power generation facility including a turbine, and a lubricant supply device that supplies lubricant to a bearing of the turbine, and the lubricant supply device includes an oil tank that stores the lubricant. The main oil pump for supplying the bearing with lubricating oil stored in the oil tank, the plurality of emergency oil pumps for supplying the bearing with lubricating oil stored in the oil tank, and the plurality of emergency oil pumps, respectively. A plurality of emergency oil pump drivers and a direct current power source serving as a drive source for the plurality of emergency oil pump drivers.

  According to the present invention, the start-up time of the emergency oil pump of the lubricating oil supply device can be shortened, and the turbine can be smoothly stopped even when the main oil pump becomes inoperable.

It is a figure showing the composition of the power plant concerning a 1st embodiment of the present invention. It is a figure which shows the structure of the power plant which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the power plant which concerns on 3rd Embodiment of this invention. It is a figure which shows the structure of the power plant which concerns on 4th Embodiment of this invention. It is a flowchart showing the control procedure of the emergency oil pump system which concerns on 1st Embodiment of this invention.

<First Embodiment>
Hereinafter, the power plant 70 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 5.

  FIG. 1 is a diagram illustrating a configuration of a power plant 70 according to the present embodiment. As shown in FIG. 1, the power plant 70 includes a power generation facility 50 and a lubricant supply device 60 for supplying the lubricant to the bearings of the power generation facility 50. Hereinafter, the power generation facility 50 and the lubricating oil supply device 60 according to the present embodiment will be described.

(Power generation equipment)
The power generation facility 50 according to the present embodiment is a so-called conventional power generation facility including a steam generation unit (not shown), a high / medium pressure turbine 1, a low pressure turbine 2, a load (for example, a generator) 3, and the like.

  For example, a boiler of a thermal power generation facility is applied to the steam generation unit. The steam generation unit generates steam as a working fluid that drives the high and medium pressure turbine 1. The steam generated in the steam generating unit is supplied to the high and intermediate pressure turbine 1.

  The high and medium pressure turbine 1 is pivotally supported with respect to the first bearing 4 and the second bearing 5 so as to be rotatable. The high and medium pressure turbine 1 may be connected coaxially to the low pressure turbine 2 or may be connected to a load (not shown) different from the low pressure turbine 2. The high and intermediate pressure turbine 1 is driven by steam supplied from a steam generation unit. The steam supplied from the steam generation unit to the high and intermediate pressure turbine 1 is supplied to the low pressure turbine 2.

  The low-pressure turbine 2 is pivotally supported with respect to the third bearing 7 and the fourth bearing 8. The low-pressure turbine 2 is driven by steam after driving the high-medium pressure turbine 1. The steam supplied to the low-pressure turbine 2 is recovered as water by, for example, a water cover, and is supplied again to the steam generation unit.

  The load 3 is rotatably supported with respect to the fourth bearing 8 and the fifth bearing 9. The load 3 is connected to the low pressure turbine 2. Power generated by driving the low-pressure turbine 2 is transmitted to the load 3. The load 3 is driven by this power.

  A thrust bearing 6 is provided between the high intermediate pressure turbine 1 and the low pressure turbine 2, for example, between the second bearing 5 and the third bearing 7. The thrust bearing 6 supports an axial force acting on a rotor such as the high intermediate pressure turbine 1 or the low pressure turbine 2.

(Lubricating oil supply device)
The lubricating oil supply device 60 is a device for supplying lubricating oil to the bearings 4 to 9 that respectively support the high and medium pressure turbine 1, the low pressure turbine 2, and the load 3.

  The lubricating oil supply device 60 includes an oil tank 10, a main oil pump system 11, an auxiliary oil pump system 12, an emergency oil pump system 13, a control device 20, a pressure sensor (pressure gauge) 21, and oil cooling. And a lubricating oil filter 23.

  The oil tank 10 stores lubricating oil supplied to the bearings 4 to 9. The oil tank 10 is connected to the bearings 4 to 9 by the outer pipe 30.

  The main oil pump system 11 includes a main oil pump 14 and a main oil pump driver 15. The main oil pump 14 is a pump for supplying the lubricating oil stored in the oil tank 10 to the bearings 4 to 9. The main oil pump 14 is provided inside the oil tank 10. The main oil pump driver 15 is provided outside the oil tank 10, and its output shaft is connected to the drive shaft of the main oil pump 14. The main oil pump driver 15 drives the main oil pump 14 by driving the output of the power generation facility 50, that is, a part of the generated power of the load 3 as a power source.

  The auxiliary oil pump system 12 includes an auxiliary oil pump 16 and an auxiliary oil pump driver 17. For example, the auxiliary oil pump 16 supplies the lubricating oil stored in the oil tank 10 to the bearings 4 to 9 in place of the main oil pump 14 when the main oil pump 14 cannot be driven due to a turbine trip or a malfunction. It is a pump to do.

  The auxiliary oil pump 16 is disposed inside the oil tank 10. The auxiliary oil pump driver 17 is provided outside the oil tank 10, and its output shaft is connected to the drive shaft of the auxiliary oil pump 16. The auxiliary oil pump driver 17 drives an auxiliary oil pump 16 by using an AC power source (not shown) such as a commercial power source as a power source.

  The emergency oil pump system 13 includes an emergency oil pump 18 and an emergency oil pump drive device 19. In the emergency oil pump 18, for example, a turbine trip or the like occurs in a situation where the AC power supply of the lubricating oil supply device 60 is lost for some reason, and the main oil pump 14 and the auxiliary oil pump 16 cannot maintain the bearing hydraulic pressure. In this case, it is a pump for supplying the lubricating oil stored in the oil tank 10 to the bearings 4 to 9 in place of the main oil pump 14 and the auxiliary oil pump 16.

  When a turbine trip or the like occurs in a situation where the AC power supply of the lubricating oil supply device 60 is lost, the main oil pump 14 decelerates and then stops, and the auxiliary oil pump 16 cannot be driven. For this reason, the bearing hydraulic pressure gradually decreases. When the bearing oil pressure falls below a predetermined oil pressure, the emergency oil pump 18 supplies the lubricating oil stored in the oil tank 10 to the bearings 4 to 9 until the turbine stops. A method for driving the emergency oil pump 18 will be described later.

  The emergency oil pump system 13 is provided with a plurality of emergency oil pumps 18. The total capacity of the plurality of emergency oil pumps 18 is set to be equal to or greater than the capacity of the main oil pump 14. The capacities of the emergency oil pumps 18 may be different, but are the same in this embodiment. The emergency oil pump 18 is provided inside the oil tank 10. The emergency oil pump driver 19 is provided outside the oil tank 10, and its output shaft is connected to the drive shaft of the emergency oil pump 18. The emergency oil pump driver 19 is driven using a DC power source 33 (for example, a battery) as a power source, and drives the corresponding emergency oil pump 18.

  A discharge pipe 32 of the main oil pump 14, the auxiliary oil pump 16 and the emergency oil pump 18 is connected to the oil cooler 22. The oil cooler 22 serves to cool the lubricating oil supplied from the main oil pump 14, the auxiliary oil pump 16, or the emergency oil pump 18, and is provided outside the oil tank 10.

  The lubricating oil filter 23 is connected to the oil cooler 22 through a pipe. The lubricating oil filter 23 is provided downstream of the oil cooler 22 in the lubricating oil flow direction. The lubricating oil filter 23 removes impurities contained in the lubricating oil sent from the oil cooler 22. The lubricating oil filter 23 is connected to the bearings 4 to 9 via the inner pipe 31. The inner pipe 31 passes through the inner side of the outer pipe 30, lubricant is sent to the bearings 4 to 9 through the inner pipe 31, and the lubricant discharged from the bearings 4 to 9 passes through the outer pipe 30 to the oil tank 10. Return.

  A plurality of pressure sensors 21 are attached to the inner pipe 31 on the downstream side in the lubricating oil flow direction with respect to the lubricating oil filter 23. In the present embodiment, three pressure sensors 21 are provided, and each pressure sensor 21 measures the pressure of the lubricating oil supplied to the bearings 4 to 9 as a bearing hydraulic pressure value.

  The control device 20 is electrically connected to at least a plurality of pressure sensors 21 and a plurality of emergency oil pump drivers 19, respectively. The control device 20 controls the plurality of emergency oil pump drivers 19 based on the measurement results of the plurality of pressure sensors 21. Specifically, the control device 20 compares the bearing hydraulic pressure value Ps measured by the plurality of pressure sensors 21 with the set pressure value Pa. The set pressure value Pa was set higher with respect to the minimum pressure required to maintain the oil film formed between the bearings 4 to 9 and the rotor in consideration of the start-up time of the emergency oil pump system 13. Value. Then, when two or more bearing oil pressure values Ps out of the bearing oil pressure values Ps measured by the plurality of pressure sensors 21 are lower than the set pressure value Pa, the control device 20 includes a plurality of emergency oil pump drivers 19. A drive command signal is output to the plurality of emergency oil pumps 18. Note that a battery (not shown) is connected to the control device 20 as an emergency power source.

(Operation)
Operation | movement of the lubricating oil supply apparatus 60 which concerns on this embodiment is demonstrated.

  First, a case where the power generation facility 50 is operating in a normal state will be described.

  The main oil pump driver 15 of the lubricating oil supply device 60 is driven by using a part of the output of the power generation facility 50 as a power source. When the main oil pump driver 15 is driven, lubricating oil is discharged from the main oil pump 14. The lubricating oil discharged from the main oil pump 14 is supplied to the bearings 4 to 9 through the inner pipe 31 through the oil cooler 22 and the lubricating oil filter 23, and returns to the oil tank 10 through the outer pipe 30.

  Next, a case where the main oil pump 14 cannot be driven will be described.

  When a turbine trip occurs in the power generation facility 50, the main oil pump driver 15 of the lubricating oil supply device 60 cannot receive supply of a required power generation output from the power generation facility 50. Therefore, the driving force of the main oil pump driver 15 decreases, and the main oil pump 14 starts to decelerate and eventually stops. Therefore, the lubricating oil cannot be supplied by the main oil pump 14. Further, even when a problem occurs in the main oil pump 14 or the main oil pump driver 15, the main oil pump 14 cannot supply the lubricating oil.

  When the main oil pump 14 is stopped, the auxiliary oil pump driver 17 is driven using an AC power source (commercial power source) as a power source in accordance with, for example, a command signal from the control device 20 or another control device (not shown). When the auxiliary oil pump driver 17 is driven, the lubricating oil is discharged from the auxiliary oil pump 16. Lubricating oil discharged from the auxiliary oil pump 16 is supplied to the bearings 4 to 9 via the inner pipe 31 via the oil cooler 22 and the lubricating oil filter 23.

  Thus, the lubricating oil can be supplied to the bearings 4 to 9 by the auxiliary oil pump 16 even in a situation where the main oil pump 14 cannot be driven.

  Next, the case where the main oil pump 14 and the auxiliary oil pump 16 cannot be driven will be described with reference to FIG. FIG. 5 is a flowchart showing a control procedure of the emergency oil pump system 13 by the control device 20.

  As described above, when a turbine trip occurs in the power generation facility 50 or a problem occurs in the main oil pump 14 or the main oil pump driver 15, the main oil pump 14 cannot supply the lubricating oil.

  On the other hand, when the AC power to the power plant 70 is lost for some reason, the auxiliary oil pump driver 17 using the AC power as a power source cannot be driven, and the auxiliary oil pump 16 cannot be driven. Therefore, the lubricating oil cannot be supplied by the auxiliary oil pump 16.

  The control device 20 receives an input of the bearing hydraulic pressure value Ps from the pressure sensor 21 (S1), and compares the bearing hydraulic pressure value Ps with the set pressure value Pa (S2). When the main oil pump 14 begins to decelerate, the pressure of the lubricating oil supplied to the bearings 4 to 9 gradually decreases. That is, when the main oil pump 14 begins to decelerate, the bearing hydraulic pressure value Ps measured by the pressure sensor 21 gradually decreases. The control device 20 determines whether or not the bearing hydraulic pressure value Ps is below the set pressure value Pa (S3). Then, the control device 20 returns the procedure to S1 if two or more of the bearing hydraulic pressure values Ps are equal to or higher than the set pressure value Pa. If two or more of the bearing hydraulic pressure values Ps are lower than the set pressure value Pa, the control device 20 A drive command signal is output to the emergency oil pump driver 19 (S4).

  The plurality of emergency oil pump drivers 19 are driven by power from the DC power supply 33 when receiving a drive command signal from the control device 20. When a plurality of emergency oil pump drivers 19 are driven, the corresponding emergency oil pumps 18 are driven. Then, the lubricating oil is discharged from the plurality of emergency oil pumps 18 and supplied to the bearings 4 to 9 through the oil cooler 22 and the lubricating oil filter 23.

  In this way, even when the main oil pump 14 and the auxiliary oil pump 16 cannot be driven, the plurality of emergency oil pumps 18 can supply the lubricating oil to the bearings 4 to 9. After the turbine is stopped, the control device 20 stops the plurality of emergency oil pumps 18 as necessary.

(effect)
(1) Ensuring turbine safety According to the present embodiment, the emergency oil pump system 13 includes a plurality of emergency oil pumps 18, and the total capacity of the plurality of emergency oil pumps 18 is the capacity of the main oil pump 14. It is set to be the above. In other words, the capacity of each emergency oil pump 18 is smaller than the capacity of the main oil pump 14 or the auxiliary oil pump 16. Therefore, since the required torque of the emergency oil pump 18 per unit is smaller than the required torque of the main oil pump 14 and the like, the starting time is shortened accordingly, and the time until the pressure is stabilized can be shortened. As a result, the minimum bearing hydraulic pressure value Ps required to maintain the oil film formed between the bearing and the rotor can be maintained, and the minimum required bearing hydraulic pressure value Ps can be ensured. Therefore, the startup time of the emergency oil pump 18 of the lubricating oil supply device 60 is shortened, and the turbine can be smoothly and safely stopped even when the main oil pump 14 becomes inoperable. Furthermore, since the capacity of the emergency oil pump 18 is smaller than the capacity of the main oil pump 14 or the auxiliary oil pump 16, the power consumption required for starting the emergency oil pump 18 can be reduced.

(2) Labor Saving According to the present embodiment, the control device 20 compares the bearing hydraulic pressure value Ps measured by the pressure sensor 21 with the set pressure value Pa, and the bearing hydraulic pressure value Ps measured by the pressure sensor 21 is When the pressure falls below the set pressure value Pa, a drive command signal is output to the emergency oil pump driver 19. Then, the emergency oil pump 18 is driven via the emergency oil pump driver 19, and the lubricating oil is supplied to the bearings 4 to 9. Therefore, it is not necessary for the operator to drive the emergency oil pump driver 19 while monitoring the bearing hydraulic pressure value Ps, and the burden on the operator can be reduced. In addition, by using a plurality of pressure sensors 21, even if a failure occurs in any of the pressure sensors 21, a decrease in the reliability of the measured bearing hydraulic pressure value Ps can be suppressed.

(3) Manufacturability According to the present embodiment, the emergency oil pump system 13 includes a plurality of emergency oil pump drivers 19 and a plurality of emergency oil pumps 18, and has a simple structure. Yes. Therefore, the emergency oil pump system 13 of this embodiment can be easily applied to an existing lubricating oil supply device. For example, instead of existing emergency oil pumps and emergency oil pump drivers, a plurality of sets of emergency oil pumps 18 and emergency oil pump drivers 19 having a total capacity equal to or greater than the capacity of existing emergency oil pumps are provided. By installing, it can be easily applied to an existing lubricating oil supply device.

Second Embodiment
FIG. 2 is a diagram illustrating a configuration of the power plant 71 according to the present embodiment. In FIG. 2, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The power plant 71 according to this embodiment is different from the lubricant oil supply device 60 of the power plant 70 according to the first embodiment in the configuration of the lubricant oil supply device 61. Specifically, as shown in FIG. 2, the lubricating oil supply device 61 is provided with an accumulator 24. Other configurations are the same as those in the first embodiment.

  The accumulator 24 is attached to, for example, a portion of the discharge pipe 32 between the oil tank 10 and the oil cooler 22, and the inside thereof is filled with a fluid sealed in a rubber film or the like. The part where the accumulator 24 is installed is not necessarily limited to the above part.

  When the power generation facility 50 is operating in a normal state, the pressure of the lubricating oil supplied to the bearings 4 to 9, that is, the pressure of the lubricating oil flowing through the discharge pipe 32 is the pressure of the fluid enclosed in the accumulator 24. Higher than. Therefore, the fluid sealed in the accumulator 24 is compressed, and pressurized lubricating oil is accumulated in the accumulator 24.

  For example, in the process until the main oil pump 14 stops due to a turbine trip or the like, the pressure of the lubricating oil flowing through the discharge pipe 32 becomes lower than the pressure of the fluid sealed in the accumulator 24. At that time, the fluid sealed inside the accumulator 24 expands, and the lubricating oil accumulated in the accumulator 24 is discharged to the discharge pipe 32. The lubricating oil discharged to the discharge pipe 32 is supplied to the bearings 4 to 9 through the oil cooler 22 and the lubricating oil filter 23, and then through the inner pipe 31.

  Also in the present embodiment, by providing the emergency oil pump system 13 including the plurality of emergency oil pumps 18, each effect obtained in the first embodiment can be obtained. In addition, the following effects are obtained in the present embodiment.

  (4) According to the present embodiment, the lubricating oil accumulated in the accumulator 24 during normal operation is supplied to the bearings 4 to 9 in the process in which the bearing oil pressure value Ps decreases and the emergency oil pump system 13 starts. . Therefore, there is an effect that it is possible to further reduce the decrease in bearing hydraulic pressure until the emergency oil pump 18 is driven.

<Third Embodiment>
FIG. 3 is a diagram illustrating a configuration of the power plant 72 according to the present embodiment. In FIG. 3, parts that are the same as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted as appropriate.

  The power plant 72 according to the present embodiment differs from the lubricant oil supply device 60 of the power plant 70 according to the first embodiment in the configuration of the lubricant oil supply device 62. Specifically, as shown in FIG. 3, in the lubricating oil supply device 62, the main oil pump 14 is connected to the drive shaft of the turbine of the power generation facility 50. Further, the lubricating oil supply device 62 includes an oil turbine 25, a booster oil pump 26, a suction pump 27, and a suction pump driver 28.

  The main oil pump 14 is provided outside the oil tank 10 and is connected to the drive shaft of the turbine of the power generation facility 50. Although the main oil pump 14 can be connected to the drive shaft of the low-pressure turbine 2, the present embodiment shows an example in which the main oil pump 14 is connected to the drive shaft of the high / medium-pressure turbine 1. That is, the main oil pump 14 is driven by the rotational power of the turbine. Lubricating oil is supplied to the main oil pump 14 from a booster oil pump 26 described later. When the main oil pump 14 is driven by the turbine, the lubricating oil supplied from the booster oil pump 26 is discharged from the main oil pump 14. The lubricating oil discharged from the main oil pump 14 is supplied to an oil turbine 25 described later.

  The oil turbine 25 is provided inside the oil tank 10 and is connected to the main oil pump 14 via a pipe. The oil turbine 25 is driven by supplying lubricating oil from the main oil pump 14. The oil turbine 25 is connected to the discharge pipe 32 via a pipe. When the oil turbine 25 is driven, the booster oil pump 26 is driven, and the lubricating oil that has driven the booster oil pump 26 flows into the discharge pipe 32 and is supplied to the bearings 4 to 9 through the oil cooler 22 and the lubricating oil filter 23. Is done.

  The booster oil pump 26 is provided inside the oil tank 10 and is connected to the oil turbine 25. The booster oil pump 26 is connected to the main oil pump 14 via a pipe. As described above, when the booster oil pump 26 is driven, the lubricating oil is supplied from the booster oil pump 26 to the main oil pump 14.

  The suction pump 27 is provided inside the oil tank 10 and is connected to the main oil pump 14 via a pipe. For example, when sufficient lubricating oil is not supplied from the booster oil pump 26 to the main oil pump 14 such as when the turbine of the power generation facility 50 is started, the lubricating oil discharged from the suction pump 27 is supplied to the main oil pump 14.

  The output shaft of the suction pump driver 28 is connected to the drive shaft of the suction pump 27. The suction pump driver 28 drives the suction pump 27 by using, for example, an AC power source such as a commercial power source as a power source. Other configurations are the same as those of the first embodiment.

  When the power generation facility 50 is operating in a normal state, the booster oil pump 26 is driven in conjunction with the turbine of the power generation facility 50. Then, the lubricating oil sucked up by the booster oil pump 26 is discharged by the main oil pump 14, and passes through the oil turbine 25, the oil cooler 22 and the lubricating oil filter 23 as described above, passes through the inner pipe 31, and the bearings 4˜4. 9 is supplied.

  Also in the present embodiment, the effects obtained in the first embodiment can be obtained by providing the emergency oil pump system 13 including the plurality of emergency oil pumps 18. In addition, the following effects can be obtained in the present embodiment.

  (5) According to the present embodiment, the main oil pump 14 is connected to the drive shaft of the turbine and is driven in conjunction with the drive of the turbine. Therefore, there is no need to use a part of the output of the power generation facility 50, that is, the generated power of the load 3 as a power source of the main oil pump 14, and the power generation efficiency of the load 3 can be improved.

  (6) According to the present embodiment, since the main oil pump 14 is driven by using the turbine of the power generation facility 50 as a power source, the inertia of the high / medium pressure turbine 1 and the low pressure turbine 2 is large. Compared with the first and second embodiments, the deceleration is moderate. Therefore, an accumulator is not usually provided in a lubricating oil supply device using such a shaft drive type main oil pump. In the case where the accumulator is not provided, for example, when the power generation facility 50 is stopped due to some factor while the rotation speed of the main oil pump 14 is slow at the time of starting the power generation facility 50, the bearing hydraulic pressure is set to a minimum required pressure. There may be situations where it takes less time to fall below. Even in such a situation, according to the present embodiment, a plurality of small emergency oil pumps 18 can be installed to quickly suppress a decrease in bearing hydraulic pressure, so that it can be flexibly handled. There is an effect.

<Fourth embodiment>
FIG. 4 is a diagram illustrating a configuration of the power plant 73 according to the present embodiment. In FIG. 4, parts that are the same as in the first embodiment are given the same reference numerals, and descriptions thereof are omitted as appropriate.

  The power plant 73 according to the present embodiment is different from the power plant 50 of the power plant 70 according to the first embodiment in the configuration of the power generation facility 51. Specifically, as shown in FIG. 4, the power generation facility 51 includes a steam generation unit (not shown), a high / medium pressure turbine 1, a low pressure turbine (not shown), a gas turbine 29, a load (for example, a generator) 3, and the like. This is a so-called combined power generation facility.

  The gas turbine 29 includes a compressor, a combustor, a turbine, and the like, and a rotor is rotatably supported by the third bearing 7 and the fourth bearing 8. In the gas turbine 29, air and fuel compressed by the compressor are burned in the combustor to generate gas, and the turbine is driven using this gas as a working fluid. The gas discharged from the gas turbine 29 is supplied to the steam generator. The gas turbine 29 is connected to the load 3.

  The high and medium pressure turbine 1 may be connected coaxially to the gas turbine 29 or may be connected to a load (not shown) different from the gas turbine 29. The high and medium pressure turbine 1 is driven by the steam generated in the steam generation unit, and the steam that has driven the high and medium pressure turbine 1 is recovered as water by, for example, a water cover and supplied again to the steam generation unit. And the gas discharged | emitted from the gas turbine 29 is converted into a vapor | steam again in a steam generation part by using as a heat source. Other configurations are the same as those of the first embodiment.

  Also in the present embodiment, the effects obtained in the first embodiment can be obtained by including the emergency oil pump system 13 including the plurality of emergency oil pumps 18. In addition, the following effects can be obtained in the present embodiment.

  (7) As in the present embodiment, the present invention can be applied to not only conventional power generation facilities but also combined cycle power generation facilities without problems. In short, the application target of the present invention is a lubricating oil supply facility that supplies lubricating oil to a turbine bearing of a power generation facility, and the aspect of the turbine system and the like is not particularly limited.

<Others>
The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. For example, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  In each embodiment, the case where the emergency oil pump system 13 includes two emergency oil pumps 18 has been described as an example. However, the essential effect of the present invention is that the start-up time of the emergency oil pump 18 of the lubricating oil supply device 60 can be shortened and the turbine can be smoothly stopped even when the main oil pump 14 becomes inoperable. Therefore, as long as this essential effect is obtained, the number of emergency oil pumps 18 is not necessarily limited to two. For example, the emergency oil pump system 13 may include three or more emergency oil pumps 18, and the total capacity of the emergency oil pumps 18 may be set to be greater than or equal to the capacity of the main oil pump 14. In this case, in order to cover the capacity of the main oil pump 14, the capacity of the emergency oil pump 18 per unit can be further reduced, and the effects of shortening the start-up time and reducing power consumption can be expected. .

  Further, in order to obtain the above effect (2), the configuration in which the emergency oil pump 18 is automatically activated when necessary has been described as an example. However, as long as the essential effect of the present invention described above is obtained, The oil pump 18 may be manually activated. In addition, the configuration in which the three pressure sensors 21 are provided has been described as an example. However, the number of installed pressure sensors is not limited as long as the above-described essential effects of the present invention are obtained. For example, the number of pressure sensors 21 may be two or less, or four or more.

DESCRIPTION OF SYMBOLS 1 High and medium pressure turbine 2 Low pressure turbine 3 Generator 10 Oil tank 11 Main oil pump system 12 Auxiliary oil pump system 13 Emergency oil pump system 14 Main oil pump 15 Main oil pump driver (AC motor)
16 Auxiliary oil pump 17 Auxiliary oil pump driver (AC motor)
18 Emergency oil pump 19 Emergency oil pump driver (DC motor)
20 Control device 21 Pressure sensor (pressure gauge)
24 Accumulator 33 DC power supply 50, 51 Power generation facility 60, 61, 62, 63 Lubricating oil supply device 70, 71, 72, 73 Power plant

Claims (12)

A power generation facility including a turbine, and a lubricant supply device that supplies lubricant to a bearing of the turbine,
The lubricating oil supply device includes:
An oil tank for storing the lubricating oil;
A main oil pump for supplying the lubricating oil stored in the oil tank to the bearing;
A plurality of emergency oil pumps for supplying the bearing with the lubricating oil stored in the oil tank;
A plurality of emergency oil pump drivers respectively connected to the plurality of emergency oil pumps;
A power plant comprising: a direct-current power source serving as a drive source for the plurality of emergency oil pump drivers. The power plant according to claim 1,
The power plant, wherein a total capacity of the plurality of emergency oil pumps is greater than or equal to a capacity of the main oil pump. The power plant according to claim 1,
A power plant comprising a main oil pump driver connected to the main oil pump and driving the main oil pump. The power plant according to claim 3,
The main oil pump driver is driven by an AC power source. The power plant according to claim 3,
The main oil pump driver is driven by a part of the output of the power generation facility. The power plant according to claim 3,
The main oil pump driver is connected to a drive shaft of the turbine and is driven through the drive shaft. In the power plant according to claim 5 or 6,
An auxiliary oil pump for supplying the lubricating oil to the bearing;
A power plant comprising: an auxiliary oil pump driver connected to the auxiliary oil pump and driven by an AC power source. The power plant according to claim 1,
A pressure gauge for measuring the pressure of the lubricating oil supplied to the bearing;
A power plant comprising: a control device that outputs a drive signal to the plurality of emergency oil pump drivers when a pressure measured by the pressure gauge falls below a set pressure. The power plant according to claim 1,
A power plant comprising an accumulator provided downstream of the plurality of emergency oil pumps. The power plant according to claim 1,
The power generation plant is a conventional power generation facility. The power plant according to claim 1,
The power generation plant is a combined cycle power generation facility. A power generation facility including a turbine, and a lubricating oil supply device that supplies lubricating oil to a bearing of the turbine,
The lubricating oil supply device includes an oil tank that stores the lubricating oil, a main oil pump that supplies the lubricating oil stored in the oil tank to the bearing, and an emergency oil that supplies the lubricating oil to the bearing. A power plant remodeling method comprising a pump, an emergency oil pump driver connected to the emergency oil pump, and a direct current power source serving as a drive source of the emergency oil pump driver,
In place of the existing emergency oil pump and emergency oil pump driver, a plurality of sets of emergency oil pumps and emergency oil pump drivers having a total capacity equal to or greater than the capacity of the existing emergency oil pump are installed. A power plant remodeling method characterized by the above.

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