A steam turbine generator oil circulation system

Abstract

This application discloses a steam turbine generator oil circulation system, comprising: a cooling oil assembly, a steam turbine, a generator, and a transmission case; the output shaft of the steam turbine extends into the transmission case; the input shaft of the generator extends into the transmission case; the output shaft is drively connected to the input shaft; the cooling oil assembly includes: an oil tank, a first oil pump, a second oil pump, a cooler, a battery, a first pipeline, and a second pipeline; the transmission case connects the output end of the first pipeline to the input end of the second pipeline; the oil tank connects the output end of the second pipeline to the input end of the first pipeline; the first oil pump connects to the input end of the first pipeline; the second oil pump connects to the input end of the first pipeline; the cooler is disposed on the first pipeline; the battery is electrically connected to the second oil pump. In this solution, when the first oil pump and the cooler are de-energized, the battery can supply power to the first oil pump, avoiding an overheating accident due to oil shortage in the transmission case, and effectively reducing the risk of system overheating.

Description

Technical Field

[0001] This application relates to the field of steam turbine technology, and in particular to a steam turbine generator oil circulation system. Background Technology

[0002] A steam turbine is a device that converts mechanical energy into electrical energy through a generator. Taking a steam turbine as an example, high-temperature, high-pressure steam from equipment such as boilers drives the blades and shaft to rotate within the turbine, causing the shaft to rotate the generator rotor. Correspondingly, the turbine shaft and the generator rotor are connected by a transmission structure.

[0003] During power generation, the turbine shaft and transmission components mentioned above need to rotate at high speeds. To improve the service life of the transmission components and ensure that the equipment operates within the normal temperature range, cooling components are installed in the turbine system. A common cooling component is the circulating oil cooling system.

[0004] The circulating oil cooling system typically includes an oil pump and a cooler, both of which need to be connected to a power source. In emergency situations such as power failure in the oil system, dynamic and static friction, or increased vibration, an emergency shutdown is required. However, due to the inertia of the turbine impeller, the turbine shaft can continue to rotate. The longer this continues, the greater the safety hazard to the unit. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a steam turbine generator oil circulation system to solve the problem of overheating risk caused by the steam turbine shaft continuing to rotate while the circulating cooling components stop working when the system loses power.

[0006] To achieve the above technical objectives, this application provides a steam turbine generator oil circulation system, including: a cooling oil assembly, a steam turbine, a generator, and a transmission box;

[0007] The output shaft of the steam turbine extends into the transmission box;

[0008] The input shaft of the generator extends into the transmission box;

[0009] The output shaft is connected to the input shaft via a drive mechanism.

[0010] The cooling oil assembly includes: an oil tank, a first oil pump, a second oil pump, a cooler, a battery, a first pipeline, and a second pipeline;

[0011] The transmission box connects the output end of the first pipeline to the input end of the second pipeline;

[0012] The oil tank connects the output end of the second pipeline to the input end of the first pipeline;

[0013] The first oil pump is connected to the input end of the first pipeline;

[0014] The second oil pump is connected to the input end of the first pipeline;

[0015] The cooler is installed on the first pipeline;

[0016] The battery is electrically connected to the second oil pump.

[0017] Furthermore, the first pipeline includes a first input terminal and a second input terminal;

[0018] The first oil pump is connected to the first input terminal;

[0019] The second oil pump is connected to the second input terminal;

[0020] The cooler is located at the first input terminal.

[0021] Furthermore, an oil filter is installed on the first pipeline.

[0022] Furthermore, it also includes: a hydraulic retarder;

[0023] The cooling oil assembly also includes: a third pipeline;

[0024] The hydraulic retarder is installed inside the transmission box;

[0025] One end of the third pipeline is connected to the first pipeline, and the other end is connected to one end of the hydraulic retarder;

[0026] The other end of the hydraulic retarder is connected to either the output shaft or the input shaft.

[0027] Furthermore, a reduction gear is provided on the output shaft or the input shaft;

[0028] The hydraulic retarder includes: a hydraulic chamber, an impeller, a transmission gear, and a valve;

[0029] The transmission gear meshes with the reduction gear;

[0030] The impeller is rotatably disposed within the hydraulic chamber, and the impeller is fixedly connected to the transmission gear;

[0031] The hydraulic chamber is provided with a liquid outlet hole;

[0032] The other end of the third pipeline is connected to the hydraulic chamber;

[0033] The valve is installed on the third pipeline and is used to control the opening and closing of the third pipeline.

[0034] Furthermore, it also includes a speed detector;

[0035] The speed detector is electrically connected to the valve;

[0036] The speed detector is used to detect the speed of the output shaft or the input shaft, and to control the valve to close when the speed of the output shaft or the input shaft is lower than a preset speed value.

[0037] Furthermore, the turbine is equipped with an openable and closable vacuum breaking door.

[0038] Furthermore, the valve is activated and connected synchronously with the vacuum breaker door.

[0039] Furthermore, it also includes: smoke exhaust pipes;

[0040] The exhaust pipe connects the oil tank and the second pipe.

[0041] Furthermore, it also includes: the accident fuel tank;

[0042] The outlet of the emergency fuel tank is connected to the inlet of the fuel tank.

[0043] As can be seen from the above technical solutions, this application provides a steam turbine generator oil circulation system, including: a cooling oil assembly, a steam turbine, a generator, and a transmission box; the output shaft of the steam turbine extends into the transmission box; the input shaft of the generator extends into the transmission box; the output shaft is drively connected to the input shaft; the cooling oil assembly includes: an oil tank, a first oil pump, a second oil pump, a cooler, a battery, a first pipeline, and a second pipeline; the transmission box connects the output end of the first pipeline to the input end of the second pipeline; the oil tank connects the output end of the second pipeline to the input end of the first pipeline; the first oil pump connects to the input end of the first pipeline; the second oil pump connects to the input end of the first pipeline; the cooler is disposed on the first pipeline; the battery is electrically connected to the second oil pump.

[0044] In this solution, when the first oil pump and cooler are de-energized, the battery can supply power to the first oil pump, preventing the transmission box from experiencing an oil shortage and overheating accident, and effectively reducing the risk of system overheating. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A wireframe diagram of the overall structure of a steam turbine generator oil circulation system provided in this application embodiment;

[0047] Figure 2 A magnified view of a partial location of a steam turbine generator oil circulation system provided in an embodiment of this application;

[0048] In the picture:

[0049] 10. Cooling oil assembly; 11. Oil tank; 12. First oil pump; 13. Second oil pump; 14. Cooler; 15. Battery; 16. First pipeline; 161. First input terminal; 162. Second input terminal; 163. On / off valve; 17. Second pipeline; 18. Third pipeline; 19. Oil filter;

[0050] 20. Steam turbine; 21. Output shaft; 22. Reduction gear; 23. Vacuum breaker door;

[0051] 30. Generator; 31. Input shaft;

[0052] 40. Transmission box;

[0053] 50. Hydraulic retarder; 51. Hydraulic chamber; 52. Impeller; 53. Transmission gear; 54. Valve; 55. Liquid outlet;

[0054] 60. Smoke exhaust duct;

[0055] 70. Accident fuel tank. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments in this application specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0057] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0059] Please see Figure 1 The embodiment of this application provides a steam turbine generator oil circulation system, including: a cooling oil assembly 10, a steam turbine 20, a generator 30 and a transmission box 40.

[0060] The output shaft 21 of the steam turbine 20 extends into the transmission housing 40; the input shaft 31 of the generator 30 extends into the transmission housing 40; the output shaft 21 is connected to the input shaft 31, so that the mechanical energy transmitted from the steam turbine 20 through the output shaft 21 can be transmitted to the generator 30 through the input shaft 31. In this embodiment, the output shaft 21 of the steam turbine 20 can be directly and fixedly connected to the input shaft 31, or it can be connected through other transmission components such as a gearbox, as long as the power transmission of the output shaft 21 can be transmitted to the input shaft 31.

[0061] The cooling oil assembly 10 includes: an oil tank 11, a first oil pump 12, a second oil pump 13, a cooler 14, a battery 15, a first pipeline 16, and a second pipeline 17. The oil tank 11 is used to store cooling oil.

[0062] The transmission housing 40 connects the output end of the first pipe 16 to the input end of the second pipe 17; the oil tank 11 connects the output end of the second pipe 17 to the input end of the first pipe 16. Cooling oil in the oil tank 11 can flow into the first pipe 16 and then into the transmission housing 40. After the cooling oil lubricates and cools the transmission components within the transmission housing 40, it flows out of the transmission housing 40 to the second pipe 17 and then back to the oil tank 11 via the second pipe 17.

[0063] The first oil pump 12 is connected to the input end of the first pipeline 16. In application, the first oil pump 12 can be installed on the first pipeline 16 or inside the oil tank 11 to pump cooling oil into the first pipeline 16.

[0064] The second oil pump 13 is connected to the input end of the first pipeline 16; similarly, the second oil pump 13 can be installed on the first pipeline 16 or inside the oil tank 11 to pump cooling oil into the first pipeline 16.

[0065] Cooler 14 is installed on the first pipeline 16 to cool the passing cooling oil and ensure the cooling effect of the cooling oil.

[0066] The battery 15 is electrically connected to the second oil pump 13. When the circuit connected to the cooling oil assembly 10 is de-energized, causing the first oil pump 12 and the cooler 14 to be de-energized, the battery 15 can supply power to the second oil pump 13, thus preventing the oil flow in the first pipeline 16 from being interrupted and causing the transmission components to overheat.

[0067] In this embodiment, the battery 15 can be adapted to supply power to the second oil pump 13 only when the circuit connected to the cooling oil assembly 10 is de-energized. This is achieved in the prior art, such as in existing emergency lights, by setting a power monitoring system and an intelligent control circuit in the connected circuit. When the power monitoring system detects a power outage, it triggers the intelligent control circuit to switch to battery 15 for power supply.

[0068] In this embodiment, the turbine 20 is configured such that when the circuit connected to the cooling oil assembly 10 is de-energized, the circuit connected to the turbine 20 is disconnected. This is achieved using existing technology, such as connecting the two circuits in series, which will not be elaborated in this embodiment.

[0069] In one implementation, the cooling oil flows into the transmission housing 40 to cool the components and then flows out of the transmission housing 40 in a manner that is in the prior art. For example, the output end of the first pipe 16 can be extended into the transmission housing 40 and toward the transmission component, so that the cooling oil can flow onto the transmission component, then fall into the transmission housing 40 and flow back to the second pipe 17 from the oil outlet of the transmission housing 40.

[0070] In one implementation, other transmission structure boxes in the turbine generator oil circulation system can also be connected to the first pipeline 16 and the second pipeline 17, so that the other transmission structure boxes can also be cooled by the cooling oil flowing out of the first pipeline 16. Correspondingly, the output end of the first pipeline 16 is divided into multiple branches, and each branch can be equipped with an on / off valve 163 to control the opening and closing of each output end of the first pipeline 16.

[0071] In another embodiment provided in this application, the first pipeline 16 includes a first input terminal 161 and a second input terminal 162; a first oil pump 12 is connected to the first input terminal 161; a second oil pump 13 is connected to the second input terminal 162; and a cooler 14 is disposed at the first input terminal 161.

[0072] In this embodiment, the first oil pump 12 and the second oil pump 13 are capable of delivering oil from the first input terminal 161 and the second input terminal 162, respectively. Furthermore, in this embodiment, the battery 15 is only used to power the second oil pump 13. The inventors have discovered that during the process of the turbine 20 being de-energized and the output shaft 21 coasting to a stop, the oil supplied by the second oil pump 13 without passing through the cooler 14 can meet the requirement that the transmission components do not overheat.

[0073] In other embodiments, the battery 15 may also be electrically connected to the cooler 14 and the first oil pump 12, so that the battery 15 can supply power to the cooler 14 and the first oil pump 12 when the circuit connected to the cooling oil assembly 10 is de-energized.

[0074] In one embodiment, an oil filter 19 is provided on the first pipeline 16.

[0075] In application, particles generated by the wear of bearings, gears, and other components in the aforementioned transmission system during operation will enter the second pipeline 17 along with the cooling oil. The oil filter 19 can remove impurities from the cooling oil, preventing these particles from rubbing against the pipeline and transmission components, and preventing these particles from clogging the pipeline.

[0076] In one embodiment, it further includes: a hydraulic retarder 50; the cooling oil assembly 10 further includes: a third pipeline 18; the hydraulic retarder 50 is disposed in the transmission box 40; one end of the third pipeline 18 is connected to the first pipeline 16, and the other end is connected to one end of the hydraulic retarder 50; the other end of the hydraulic retarder 50 is drive-connected to the output shaft 21 or the input shaft 31.

[0077] Specifically, when the steam turbine 20 encounters the aforementioned power outages, water hammer, component damage, severe unit vibration, or generator fire during operation, it is necessary to shut down the steam turbine 20 as quickly as possible. In this embodiment, the shutdown of the steam turbine 20 can be accelerated by activating the hydraulic retarder 50, so as to preserve the unit as much as possible when shutdown is required.

[0078] As one implementation method, please refer to Figure 2 A reduction gear 22 is provided on the output shaft 21 or the input shaft 31; the hydraulic retarder 50 includes: a hydraulic chamber 51, an impeller 52, a transmission gear 53, and a valve 54; the transmission gear 53 is meshed with the reduction gear 22; the impeller 52 is rotatably disposed in the hydraulic chamber 51, and the impeller 52 is fixedly connected to the transmission gear 53; the hydraulic chamber 51 is provided with an outlet hole 55; the other end of the third pipeline 18 is connected to the hydraulic chamber 51; the valve 54 is disposed on the third pipeline 18 and is used to control the opening and closing of the third pipeline 18.

[0079] In this embodiment, the impeller 52 and the transmission gear 53 are fixedly connected, so they rotate synchronously.

[0080] When valve 54 is opened, the cooling oil in the first pipeline 16 can flow into the hydraulic chamber 51 through the third pipeline 18, increasing the rotational resistance of the impeller 52 in the hydraulic chamber 51. The impeller 52 then drives the transmission gear 53 to reduce speed, thereby reducing the speed of the output shaft 21 or the input shaft 31, effectively shortening the shutdown time and making the turbine shutdown process smoother. It should be noted that the cooling oil entering the hydraulic chamber 51 can flow out of the hydraulic chamber 51 through the outlet hole 55.

[0081] In one embodiment, a speed detector is further included; the speed detector is electrically connected to the valve 54; the speed detector is used to detect the rotational speed of the output shaft 21 or the input shaft 31, and to control the valve 54 to close when the rotational speed of the output shaft 21 or the input shaft 31 is lower than a preset speed value. The preset speed value can be 5 revolutions per second.

[0082] In one embodiment, the steam turbine 20 is provided with an openable and closable vacuum rupture door 23. The vacuum rupture door 23 can break the vacuum inside the steam turbine 20, allowing the steam turbine 20 to shut down more quickly.

[0083] In application, valve 54 and vacuum break door 23 are activated synchronously, so that they open simultaneously when accelerated shutdown is required.

[0084] In one embodiment, it further includes: a smoke exhaust pipe 60; the smoke exhaust pipe 60 is connected to the oil tank 11 and the second pipe 17.

[0085] In the cooling oil assembly, the oil temperature rises after heat exchange with the transmission components. During circulation, the oil comes into contact with air, causing light components to evaporate and form oil vapor. The exhaust pipe 60 effectively removes this oil vapor, and in doing so, also carries away impurities and moisture from the system, thus improving the safety of the cooling oil assembly and maintaining the cleanliness of the cooling oil.

[0086] In one embodiment, it further includes: an emergency fuel tank 70; the outlet of the emergency fuel tank 70 is connected to the inlet of the fuel tank 11.

[0087] During the operation of the steam turbine 20, sudden accidents such as oil pipe rupture and cooling oil leakage may occur. The emergency oil tank 70 can quickly collect the leaked cooling oil in the event of such an emergency, and after collecting and filtering the leaked cooling oil, it is transported to the oil tank 11.

[0088] In summary, the turbine generator oil circulation system provided in this embodiment is equipped with a DC oil pump (second oil pump 13) powered by a storage battery. The oil pump starts when power is lost, lubricating the bearings and preventing dry friction. At the same time, a vacuum breaker door 23 and a hydraulic retarder 50 are provided. These open when a rapid shutdown is required in emergency situations such as power loss, dynamic and static friction, or increased vibration, allowing air to enter the machine and generate resistance through friction with the blades. Simultaneously, the hydraulic retarder opens the oil inlet valve, and the rotor is powered by hydraulic reaction force. The combination of these two measures can maximize the speed of shutdown, thereby minimizing accident losses.

[0089] The above are merely preferred embodiments of this application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A steam turbine power generation oil cycle system characterized by comprising: include: Cooling oil assembly (10), steam turbine (20), generator (30) and transmission box (40); The output shaft (21) of the steam turbine (20) extends into the transmission box (40); The input shaft (31) of the generator (30) extends into the transmission box (40); The output shaft (21) is connected to the input shaft (31) in a driving manner. The cooling oil assembly (10) includes: an oil tank (11), a first oil pump (12), a second oil pump (13), a cooler (14), a battery (15), a first pipeline (16), and a second pipeline (17). The transmission box (40) connects the output end of the first pipeline (16) with the input end of the second pipeline (17); The oil tank (11) connects the output end of the second pipeline (17) to the input end of the first pipeline (16); The first oil pump (12) is connected to the input end of the first pipeline (16); The second oil pump (13) is connected to the input end of the first pipeline (16); The cooler (14) is disposed on the first pipeline (16); The battery (15) is electrically connected to the second oil pump (13).

2. The steam turbine generator oil circulating system of claim 1, wherein The first pipeline (16) includes a first input terminal (161) and a second input terminal (162). The first oil pump (12) is connected to the first input terminal (161); The second oil pump (13) is connected to the second input terminal (162); The cooler (14) is located at the first input terminal (161).

3. The steam turbine generator oil circulating system of claim 2, wherein, An oil filter (19) is installed on the first pipeline (16).

4. The steam turbine generator oil circulation system of claim 1, wherein Also includes: Hydraulic retarder (50); The cooling oil assembly (10) further includes: a third pipeline (18); The hydraulic retarder (50) is disposed inside the transmission box (40); One end of the third pipeline (18) is connected to the first pipeline (16), and the other end is connected to one end of the hydraulic retarder (50). The other end of the hydraulic retarder (50) is connected to the output shaft (21) or the input shaft (31).

5. The steam turbine generator oil circulation system according to claim 4, characterized in that, A reduction gear (22) is provided on the output shaft (21) or the input shaft (31). The hydraulic retarder (50) includes: a hydraulic chamber (51), an impeller (52), a transmission gear (53), and a valve (54); The transmission gear (53) meshes with the reduction gear (22). The impeller (52) is rotatably disposed in the hydraulic chamber (51), and the impeller (52) is fixedly connected to the transmission gear (53); The hydraulic chamber (51) is provided with a liquid outlet (55); The other end of the third pipeline (18) is connected to the hydraulic chamber (51). The valve (54) is installed on the third pipeline (18) and is used to control the opening and closing of the third pipeline (18).

6. The steam turbine generator oil circulating system of claim 5, wherein, It also includes a speed detector; The speed detector is electrically connected to the valve (54); The speed detector is used to detect the speed of the output shaft (21) or the input shaft (31), and to control the valve (54) to close when the speed of the output shaft (21) or the input shaft (31) is lower than a preset speed value.

7. The steam turbine generator oil circulating system of claim 5, wherein, The steam turbine (20) is equipped with an openable and closable vacuum breaking door (23).

8. The steam turbine generator oil circulating system of claim 7, wherein, The valve (54) is connected to the vacuum breaking door (23) in a synchronous start-up.

9. The steam turbine generator oil circulation system of claim 1, wherein, Also includes: Smoke exhaust pipe (60); The exhaust pipe (60) connects the oil tank (11) and the second pipe (17).

10. The steam turbine generator oil circulation system according to claim 1, characterized in that, Also includes: Accident fuel tank (70); The outlet of the emergency fuel tank (70) is connected to the inlet of the fuel tank (11).

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