CN217872949U - Jacking oil device for power plant maintenance - Google Patents

Abstract

The utility model provides a power plant overhauls with apical axis oil device, include: the system comprises a preposed oil tank device, a pressure pump and a control device, wherein the preposed oil tank device is provided with an oil delivery pump, a preposed oil tank and a pressure pump which are sequentially connected, the oil delivery pump is connected with an online main oil tank, and the pressure pump is used for taking oil from the preposed oil tank, boosting the pressure and supplying the oil to a high-pressure oil supply device; the integrated control block comprises an overflow valve, redundant oil at the outlet of the high-pressure plunger pump returns to an inlet pipeline of the high-pressure plunger pump through the overflow valve, and the high-pressure oil supply device is connected with an oil system of a top shaft of the maintenance unit through a high-pressure hose; and the electric control module is connected with the preposed oil tank device and the high-pressure oil supply device through cables. The device provided by the utility model reduce equipment trouble, the reduction of overhaul time limit for a project.

Description

Jacking oil device for power plant maintenance

Technical Field

The utility model relates to a power plant jackshaft oil system technical field especially relates to a power plant overhauls and uses jackshaft oil device.

Background

Most of the rotors of the nuclear turbine generators are large and heavy, and a top shaft oil system is configured for each unit in order to reduce the turning moment of the rotors and avoid the abrasion of bearing bushes. The shaft jacking oil system provides high-pressure lubricating oil for bearings of the steam turbine, jacks up the rotating shaft to a certain height, and forms a static-pressure oil film between the rotor and the bearing oil bag, so that dry friction and damage to the bearing bush and the shaft neck between the shaft neck and the bearing bush in the process of the rotation of the rotating shaft are avoided.

Some existing power plant jacking oil system designs have some defects, and the specific expression is as follows:

firstly, the operating conditions of the top shaft oil system have higher dependency on the lubricating oil system, the inlet of the top shaft oil pump takes oil from a lubricating oil supply main pipe, the outlet oil is distributed and regulated through a collecting pipe and then is respectively supplied to each bearing, and one of the necessary precondition for the operation of the top shaft oil system is the operation of the lubricating oil system; the other type of system needs a main oil tank to maintain a high oil level without a lubricating oil system, a top shaft oil pump is arranged on the main oil tank, and an inlet of the top shaft oil pump sucks oil from the oil tank.

Secondly, the safety margin of the existing configured jacking oil system is low, when the storage unit is in fault shutdown and idles, the possibility that a barring oil pump and a direct-current oil pump are in fault at the same time, a large opening of a lubricating oil pipeline fails and the like exists, and bearing bushes can be worn and cause dynamic and static rub when serious; when the rotor is stopped in a hot state, if the faults of the lubricating oil or the jacking oil system cannot be quickly repaired and the turning cannot be timely performed, the big shaft can be bent and other mischief can be caused. The similar design units at home and abroad have multiple adverse events, for example, a top shaft oil system cannot be put into operation due to the fault of a lubricating oil system in a certain power plant, a rotor cannot be wound due to the thermal state shutdown, and finally a shaft is bent.

Thirdly, the maintenance and the coordination of the unit are inconvenient, the system configuration of the current top shaft oil system is not beneficial to the development of the overhaul operation of the unit, the lubricating oil and the top shaft oil system need to be started and stopped frequently during the overhaul, the service life loss of the formal equipment of the system is aggravated, and meanwhile, the situations that the lubricating oil system is started to run when the host machine is in an overhaul opening state, the formal oil system needs to be started in a running and matching mode by the disk rotor, and the top shaft oil system cannot be started due to the fact that the conditions are not met, so that the construction period is delayed and the like can be increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect among the prior art to a power plant overhauls and uses jackshaft oil device is provided, the device provides the jackshaft oil for the system when not possessing the online jackshaft oil equipment condition of long-term steady operation, is used for preventing rotor and bearing dry grinding, makes things convenient for the dish rotor, thereby reduces equipment trouble, shortens the overhaul period.

In order to achieve the above object, the present invention provides the following technical solutions:

a jacking oil device for power plant maintenance comprises: the system comprises a preposed oil tank device, a pressure pump and a control device, wherein the preposed oil tank device is provided with an oil delivery pump, a preposed oil tank and a pressure pump which are sequentially connected, the oil delivery pump is connected with an online main oil tank, and the pressure pump is used for taking oil from the preposed oil tank, boosting the pressure and supplying the oil to a high-pressure oil supply device; the high-pressure oil supply device is provided with an inlet filter, a high-pressure plunger pump and an integrated control block which are sequentially connected, wherein the inlet filter is connected with the preposed oil tank device, the integrated control block comprises an overflow valve, redundant oil at the outlet of the high-pressure plunger pump returns to an inlet pipeline of the high-pressure plunger pump through the overflow valve, and the high-pressure oil supply device is connected with a top shaft oil system of the maintenance unit through a high-pressure hose; and the electric control module is connected with the preposed oil tank device and the high-pressure oil supply device through cables.

As a practical way, the side surface of the front oil tank is provided with an upper pipeline and a lower pipeline, and the upper pipeline and the lower pipeline are connected with a liquid level meter together.

As a practical mode, the upper pipeline is provided with a liquid level meter upper isolation valve, and the lower pipeline is provided with a liquid level meter lower isolation valve.

As an implementable mode, an oil transfer pump isolating valve is arranged on an inlet pipeline of the oil transfer pump, a booster pump inlet isolating valve is arranged between the preposed oil tank and the booster pump, and a booster pump outlet isolating valve is arranged on an outlet pipeline of the booster pump.

As a practical mode, a movable base is arranged below the front oil tank.

As an implementable manner, the oil transfer pump is connected with an oil transfer pump motor, and the booster pump is connected with a booster pump motor.

As an implementable mode, the high-pressure plunger pump includes parallelly connected first high-pressure plunger pump and the second high-pressure plunger pump that sets up, first high-pressure plunger pump with the second high-pressure plunger pump pass through the three-way valve with entry filter intercommunication, the export of first high-pressure plunger pump is equipped with first high-pressure plunger pump export check valve, the export of second high-pressure plunger pump is equipped with second high-pressure plunger pump export check valve.

As an implementable mode, the outlets of the first high-pressure plunger pump outlet check valve and the second high-pressure plunger pump outlet check valve are converged to an intermediate pipeline, a high-pressure plunger pump outlet filter element is connected to the intermediate pipeline, and the high-pressure plunger pump outlet filter element comprises a first high-pressure plunger pump outlet filter element and a second high-pressure plunger pump outlet filter element which are arranged in parallel.

As an implementation mode, the outlet pipeline of the integrated control block is sequentially provided with a pressure gauge isolation valve, a pressure transmitter isolation valve, a high-pressure oil supply module outlet check valve and a high-pressure oil supply module outlet isolation valve, the pressure gauge isolation valve is provided with an on-site pressure gauge, and the pressure transmitter isolation valve is provided with a pressure transmitter.

As a practical way, the electric control module is externally connected with an online power supply.

Compared with the prior art, the utility model provides a power plant overhauls uses apical axis oil device has following beneficial effect:

the jacking oil device for power plant overhaul is connected in overhaul, so that the overhaul efficiency can be improved, the loss of online equipment can be reduced, and the disassembly overhaul period of the turbonator can be shortened by more than 1 day; the starting and stopping times of an online jacking oil system are reduced, and the service life loss of key sensitive equipment is reduced and avoided; the running operation is reduced, and accidents such as misoperation and system oil leakage caused by information transmission and unclear traffic bottom are avoided; the online oil system equipment can be overhauled as early as possible and can be in service in advance, the mandrel oil partial pressure adjusting test can be performed in advance when lubricating oil is not put into operation, and the time of a main engine key path is shortened.

In addition, the shutdown rotor is in a hot state, and the disc rotor is urgently needed, so that the accidents of large shaft bending, bearing damage and the like can be avoided when the jacking oil fails and is continuously used for overhauling the power plant. The temporary external power plant overhauls and uses the jackshaft oil device can simplify the system configuration, reduce the engineering cost.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced, obviously, the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic connection diagram of a jacking oil device for power plant maintenance provided by an embodiment of the present invention;

fig. 2 is a schematic view of a front oil tank device according to an embodiment of the present invention;

fig. 3 is a schematic view of the high-pressure oil supply device provided by the embodiment of the present invention.

Description of reference numerals:

1. an online main tank isolation valve; 2. a first connecting hose; 3. a front mounted tank module; 4. a second connecting hose; 5. a high pressure oil supply module; 6. a high pressure hose; 7. a first connection cable; 8. an electrical control module; 9. a second connection cable; 10. a third connecting cable; 11. moving the base; 12. a lower isolation valve of the liquid level meter; 13. a liquid level meter; 14. an upper isolation valve of the liquid level meter; 15. a front oil tank; 16. an oil transfer pump isolation valve; 17. an oil transfer pump; 18. an oil transfer pump motor; 19. a booster pump inlet isolation valve; 20. a booster pump motor; 21. a booster pump; 22. a booster pump outlet isolation valve; 23. an inlet filter; 24. a three-way valve; 25. a first high-pressure plunger pump; 26. a first high pressure plunger pump motor; 27. a second high pressure plunger pump; 28. a second high pressure plunger pump motor; 29. an outlet manifold block of the high-pressure plunger pump; 30. a check valve of an outlet of the first high-pressure plunger pump; 31. a second high-pressure plunger pump outlet check valve; 32. a first high pressure plunger pump outlet isolation valve; 33. a second high pressure plunger pump outlet isolation valve; 34. a first high pressure plunger pump outlet filter; 35. a second high pressure plunger pump outlet filter; 36. an overflow valve; 37. a pressure gauge isolation valve; 38. an on-site pressure gauge; 39. a pressure transmitter isolation valve; 40. a pressure transmitter; 41. an outlet check valve of the high-pressure oil supply module; 42. and an outlet isolation valve of the high-pressure oil supply module.

100. An online main oil tank; 101. an online power supply; 102. an exciter; 103. a generator; 104. (middle) low pressure cylinder; 105. and a high-pressure cylinder.

Detailed Description

The following is a more detailed description of the present invention by way of specific embodiments.

As shown in fig. 1 to 3, the utility model provides a but one set of adaptable multiple different power model brief integration power plant overhaul uses apical axis oil device that can be general, including leading oil tank device 3, high-pressure oil supply unit 5 and electrical control module 8.

As shown in fig. 1, a main oil tank of the maintenance unit and an inlet isolation valve 16 of an oil delivery pump of a preposed oil tank module 3 are connected through a connecting hose 2, and an online main oil tank isolation valve 1 is required to be arranged on a pipeline; the preposed oil tank 15 is connected with an inlet filter 23 of the overhaul jacking oil module through a second connecting hose 4 by an outlet isolation valve 22 of the booster pump; the high-pressure oil supply module outlet isolation valve 42 is connected with the maintenance unit top shaft oil system through the high-pressure hose 6; the ground on which the front oil tank module 3 and the high-pressure oil supply module 5 are placed should be level, so that the equipment is prevented from moving accidentally in the operation process. The oil supply of the preposed oil tank 15 of the overhauling device comes from an oil discharge port of the main oil tank, lubricating oil flows to an inlet of an oil delivery pump 17 of the preposed oil tank module 3 through a liquid level difference, the liquid level of the main oil tank is higher than the elevation of the oil supply port of the preposed oil tank 15 for ensuring that oil absorption is continuously carried out, and before the oil delivery pump 17 is started for the first time, an oil absorption pipeline is used for oil charge and exhaust, so that the oil delivery pump 17 is prevented from being dry pumped. The oil transfer pump 17 is externally connected with an oil transfer pump motor 18.

As shown in fig. 2, a proper amount of lubricant is filled in the pre-tank 15, and the lubricant can be sucked from the on-line main tank by turning on the pre-pump 17, or directly poured from the top of the pre-tank 15. The liquid level meter 13 is used for displaying the liquid level in the front oil tank 15 and participating in liquid level control, and when the liquid level meter 13 displays that the oil level reaches a high oil level or a low oil level, an alarm signal is transmitted to the electric control module 8 through the second connecting cable 9 to give an alarm in real time, and the opening and closing of the front oil delivery pump 17 are controlled. The oil transfer pump 17 has the functions of manual oil supplement and automatic oil supplement, and when the oil transfer pump 17 is in a manual oil supplement mode, the oil transfer pump is manually started and closed under the condition that the liquid level does not reach a high oil level, and is automatically closed when the liquid level reaches the high oil level; when the oil delivery pump 17 is under automatic control, the oil delivery pump 17 can be automatically started when the liquid level of the preposed oil tank 15 is at a low oil level, the pump 17 can be automatically started when the liquid level of the preposed oil tank 15 is at a high oil level, and before the oil delivery pump 17 is switched to an automatic control mode, the oil delivery pump is manually started until the oil delivery pump is at the high oil level, the oil delivery pump is automatically closed, and then the automatic mode is switched to.

The booster pump 21 is used for taking oil from the preposed oil tank 15 to boost pressure and supplying oil to the high-pressure oil supply module 5, the problem of suction caused by unsmooth oil supply can be avoided due to boosting oil supply, the booster pump 21 is provided with two starting modes, and the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 can be started normally under the premise that the booster pump 21 is started in a local starting mode and a remote starting mode. In the case of the booster pump 21 being shut down or in the event of a malfunction, the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 may be operated as usual. The front tank module 3 is equipped with a mobile base 11 for empty movement, which is equipped with an oil pan. The booster pump 21 is connected to a booster pump motor 20. When the jacking oil device is in a use state, all paths of isolation valves (namely the online main oil tank isolation valve 1, the liquid level meter lower isolation valve 12, the liquid level meter upper isolation valve 14, the oil transfer pump isolation valve 16, the booster pump inlet isolation valve 19, the booster pump outlet isolation valve 22, the three-way valve 24, the first high-pressure plunger pump outlet isolation valve 32, the second high-pressure plunger pump outlet isolation valve 33, the pressure gauge isolation valve 37, the pressure transmitter isolation valve 39 and the high-pressure oil supply module outlet check valve 41) need to be in an open state, and when equipment needs to be replaced or does not need to be used, the valves can be closed to isolate the equipment.

As shown in fig. 3, the oil in the pre-tank 15 reaches the inlet filter 23 in the high-pressure oil supply module 5 through a pipeline, so as to primarily filter out larger impurities in the oil inlet of the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27, and prevent the larger impurities from damaging the high-pressure plunger pump equipment or influencing the service performance of the high-pressure plunger pump. The oil filtered by the inlet filter 23 reaches the three-way valve 24 of the oil inlet pipe section of the pump, and the three-way valve 24 can supply oil to any one of the high-pressure plunger pumps (the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27) or can supply oil to the two high-pressure plunger pumps at the same time. The first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 are arranged in a horizontal duplex mode, and the use requirements of a million-power unit can be met. The outlets of the two high-pressure plunger pumps are all provided with check valves to prevent oil from flowing backwards to influence the operation of the pumps, as shown in fig. 3, the outlet of the first high-pressure plunger pump 25 is provided with a first high-pressure plunger pump outlet check valve 30, and the outlet of the second high-pressure plunger pump 27 is provided with a second high-pressure plunger pump outlet check valve 31. The outlet pipelines of the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 are converged on the integrated control block 29, the high-pressure plunger pump outlet check valves (a first high-pressure plunger pump outlet check valve 30 and a second high-pressure plunger pump outlet check valve 31), the outlet isolation valves (a first high-pressure plunger pump outlet isolation valve 32 and a second high-pressure plunger pump outlet isolation valve 33), the outlet filter elements (a first high-pressure plunger pump outlet filter 34 and a second high-pressure plunger pump outlet filter 35) and the overflow valve 36 of the two pumps are integrated on the integrated control block 29. The first high-pressure plunger pump outlet isolating valve 32 and the second high-pressure plunger pump outlet isolating valve 33 are used for independently closing the output of one high-pressure plunger pump corresponding to the valves during maintenance, but closing is generally not recommended in the operation process. The overflow valve 36 is used for adjusting the outlet pressure of the high-pressure oil supply module 5, and strictly forbids the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 to operate for a long time under the condition that the oil supply loop has no oil output, so that the high-temperature plunger pump and the overflow valve 36 are prevented from generating high temperature to damage equipment.

First high pressure plunger pump outlet filter 34, the parallelly connected use of second high pressure plunger pump outlet filter 35 adopt the high accuracy filter core in order to reduce the loss of pressure loss and convection current, first high pressure plunger pump outlet filter 34, with be equipped with pressure differential switch on the second high pressure plunger pump outlet filter 35, when first high pressure plunger pump outlet filter 34, second high pressure plunger pump outlet filter 35 block up pressure differential and reach the warning, the suggestion needs the change filter core. The local pressure gauge 38 is used for displaying the outlet pressure of the jacking oil pump (namely the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27), the pressure transmitter 40 can be used for remote display and control adjustment, and when the outlet pressure of the high-pressure plunger pump is suddenly reduced, the second high-pressure plunger pump can be automatically started to maintain the pressure of the main pipe.

The electric control module 8 matched with the device is used for controlling the whole set of equipment, is connected with the online power supply 101 through a first connecting cable 7, is connected with the front oil tank module 3 through a second connecting cable 9, and is connected with the high-voltage oil supply module 5 through a third cable 10. The electric control module 8 is provided with a start-stop switch and an ammeter of a first high-pressure plunger pump motor 26, a second high-pressure plunger pump motor 28, a fuel delivery pump motor 18 and a booster pump motor 20, and an emergency stop switch, wherein the four pumps can be started and stopped on site, and can also be switched into a remote control mode to carry out remote control. A set of PLC controller is configured in the cabinet and used for realizing remote control and interlocking control, automatic oil level control, keeping the hot standby state of the high-pressure oil supply pump and the like. The electric control cabinet is provided with three alarming bombers: the liquid level alarm, the high pressure filter blockage alarm and the high pressure and low pressure alarm are used for realizing various alarm functions of the equipment.

After the device is assembled, an electrical control module 5 is connected with a 380V power supply, a top shaft oil device is ready to start to operate, all valves (namely an online main oil tank isolation valve 1, a liquid level meter lower portion isolation valve 12, a liquid level meter upper portion isolation valve 14, an oil transfer pump isolation valve 16, a booster pump inlet isolation valve 19, a booster pump outlet isolation valve 22, a three-way valve 24, a first high-pressure plunger pump outlet isolation valve 32, a second high-pressure plunger pump outlet isolation valve 33, a pressure gauge isolation valve 37, a pressure transmitter isolation valve 39 and a high-pressure oil supply module outlet check valve 41) are confirmed to be in an opening state before operation, the three-way valve 24 is opened at a proper position according to the requirement of opening one or two pumps, the oil transfer pump 21 is in an automatic control state, lubricating oil is injected into a front oil tank 15, the booster pump 21 is started firstly, the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27 are started after the booster pump 21 is confirmed to operate normally, a system pressure gauge 38 is checked to show that the pressure is normal and meets the maintenance use requirements of the device, no leakage exists in a pipeline, the oil level of an overflow valve 36, the oil tank 15 is always in a normal range, the oil level range, and the device can be indicated by no abnormal operation condition that the system has no abnormal sound and no abnormal operation condition that the device has no vibration. After the jacking oil device is used, the first high-pressure plunger pump 25, the second high-pressure plunger pump 27, the booster pump 21 and the oil transfer pump 17 are sequentially closed.

The electric control module 8 is composed of a main power switch, each motor start-stop controller, a PLC controller, a control touch screen, an alarm and the like. The four pumps (the oil delivery pump 17, the booster pump 21, the first high-pressure plunger pump 25 and the second high-pressure plunger pump 27) can be started and stopped on site, and can also be switched into a remote control mode to carry out remote control. And the PLC is used for realizing remote control and interlocking control, automatic oil level control, maintenance of a hot standby state of the high-pressure oil supply pump and the like.

The main advantage of this device is for the device integration for three module (leading oil tank device 3, high-pressure oil supply unit 5 and electrical control module 8), every module all is the device of a high integrated movable, the high integrated design is favorable to the transfer of device, on-the-spot arrangement and operation supervision, the application flexibility that has the height, but simultaneously for different models prefabricated nipple joint, the continuous part pipeline section uses hose connection etc. is convenient for install additional fast, satisfy the unit and use the needs of installing additional in 30 minutes.

The utility model discloses the big just oil level self-modulation control of leading oil tank capacity of configuration ensures that the malleation of high-pressure fuel feed pump inhales oil, avoids carrying the air influence oil stream in the high-pressure fuel feeding stable, also is convenient for realize that the interconnection of leading oil pump and high-pressure fuel feed pump is interactive simultaneously, reduce pump and motor frequently open.

The high-pressure oil supply module is provided with two high-pressure plunger pumps, the oil supply amount is large, the flow regulation range is wide, the oil capacity of the provided high-pressure jacking shaft is higher than the supply capacity of an on-line system pump through pressure and flow release valve regulation, one or two pumps can be started according to requirements, and the high-pressure oil supply module is suitable for requirements of various power units.

The device is temporarily and additionally arranged between a main lubricating oil tank and an online jacking oil supply collecting pipe, lubricating oil of a preposed oil tank is absorbed from the main lubricating oil tank and can be directly filled externally for oil supplement, an outlet of the oil supply device is connected with an online jacking oil pump outlet main pipe interface to be connected into a jacking oil system, high-pressure jacking oil is supplied to the bearings by utilizing an online jacking oil main pipe, each bearing jacking oil supply pipe and a flow regulating valve, the oil supply pressure and the oil supply flow of the jacking oil device for maintenance are equivalent to or slightly higher than the oil supply parameters of the online jacking oil pump, an overflow valve is arranged at the outlet of the jacking oil pump for maintenance, and redundant oil can return to an inlet pipeline through the overflow valve. The device and the connecting pipeline are not managed as online system equipment, and are only temporarily connected when needed, the power supply is taken from a temporary power supply for field maintenance, and the start and stop of the device are controlled by maintenance personnel.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a power plant overhauls uses jackshaft oil device which characterized in that includes:

the oil pump (17) is connected with the online main oil tank (100), and the booster pump (21) is used for taking oil from the preposed oil tank (15), boosting the pressure and supplying the oil to the high-pressure oil supply device (5);

the high-pressure oil supply device (5) is provided with an inlet filter (23), a high-pressure plunger pump and an integrated control block (29) which are sequentially connected, the inlet filter (23) is connected with the preposed oil tank device (3), the integrated control block (29) comprises an overflow valve (36), redundant oil at the outlet of the high-pressure plunger pump returns to an inlet pipeline of the high-pressure plunger pump through the overflow valve (36), and the high-pressure oil supply device (5) is connected with a top shaft oil system of an overhauling unit through a high-pressure hose (6);

and the electric control module (8) is connected with the preposed oil tank device (3) and the high-pressure oil supply device (5) through cables.

2. The footshaft oil device for overhaul of power plants according to claim 1, characterized in that the side of the pre-tank (15) has an upper and a lower pipe, which are connected together with a level gauge (13).

3. The jacking shaft oil device for overhaul of a power plant as claimed in claim 2, wherein the upper pipeline is provided with a level gauge upper isolation valve (14), and the lower pipeline is provided with a level gauge lower isolation valve (12).

4. The jacking oil device for overhauling a power plant as claimed in claim 2, wherein an oil transfer pump isolation valve (16) is arranged on an inlet pipeline of the oil transfer pump (17), a booster pump inlet isolation valve (19) is arranged between the preposed oil tank (15) and the booster pump (21), and a booster pump outlet isolation valve (22) is arranged on an outlet pipeline of the booster pump (21).

5. The footshaft oil device for overhauling a power plant according to claim 1, characterized in that a moving base (11) is arranged below the preposed oil tank (15).

6. The jacking oil device for power plant maintenance according to claim 1, wherein the oil transfer pump (17) is connected with an oil transfer pump motor (18), and the booster pump (21) is connected with a booster pump motor (20).

7. The jacking oil device for power plant overhaul according to claim 1, wherein the high-pressure plunger pump comprises a first high-pressure plunger pump (25) and a second high-pressure plunger pump (27) which are arranged in parallel, the first high-pressure plunger pump (25) and the second high-pressure plunger pump (27) are communicated with the inlet filter (23) through a three-way valve (24), an outlet of the first high-pressure plunger pump (25) is provided with a first high-pressure plunger pump outlet check valve (30), and an outlet of the second high-pressure plunger pump (27) is provided with a second high-pressure plunger pump outlet check valve (31).

8. The jacking oil device for power plant overhaul according to claim 7, wherein the outlets of the first high-pressure plunger pump outlet check valve (30) and the second high-pressure plunger pump outlet check valve (31) are converged into an intermediate pipeline (43), a high-pressure plunger pump outlet filter element is connected to the intermediate pipeline (43), and the high-pressure plunger pump outlet filter element comprises a first high-pressure plunger pump outlet filter (34) and a second high-pressure plunger pump outlet filter (35) which are arranged in parallel.

9. The jacking oil device for power plant overhaul according to claim 1, wherein an outlet pipeline of the integrated control block (29) is sequentially provided with a pressure gauge isolation valve (37), a pressure transmitter isolation valve (39), a high-pressure oil supply module outlet check valve (41) and a high-pressure oil supply module outlet isolation valve (42), the pressure gauge isolation valve (37) is provided with an on-site pressure gauge (38), and the pressure transmitter isolation valve (39) is provided with a pressure transmitter (40).

10. The jacking oil device for overhauling a power plant as claimed in claim 1, wherein the electrical control module (8) is externally connected with an online power supply (101).

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