Gas turbine and lubricating oil system thereof

Abstract

The utility model discloses a gas turbine and a lubricating oil system thereof, and relates to the technical field of gas turbines. The lubricating oil system comprises a high-level oil tank; an oil supply pipeline and an oil return pipeline; the input end of the oil supply pipeline is communicated with the high-level oil tank, and the output end of the oil supply pipeline is communicated with the gas turbine; the onboard pump set is communicated with the oil supply pipeline; the input end of the oil return pipeline is communicated with an oil return inlet of the onboard pump set, and the output end of the oil return pipeline is communicated with the high-level oil tank; the input end of the oil supply bypass is communicated with the output end of the onboard pump set, and the output end of the oil supply bypass is communicated with the high-level oil tank; and the self-operated differential pressure regulating valve is arranged on the oil supply bypass. Based on the working characteristics of the self-operated differential pressure regulating valve, the oil supply amount is better matched with the working condition of the gas turbine by comparing the oil supply pressure with the pressure of the bearing cavity, and the oil supply amount of lubricating oil of the gas turbine is changed by automatically regulating the opening degree of the self-operated differential pressure regulating valve.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and in particular to a gas turbine and a lubricating oil system thereof. Background Art

[0002] The lubricating oil system of a gas turbine is used to provide lubricating oil that meets the requirements of flow, temperature and cleanliness to the transmission bearings, transmission gears and other components of the gas turbine, lubricate each lubrication point, reduce the friction of rotating bearings, transmission gears and other components, and take away the heat generated by friction, so as to ensure the continuous supply of sufficient lubricating oil and ensure the safe operation of the gas turbine. At present, the oil supply of the lubricating oil system of most aero-derivative gas turbines depends on the driving force of the gas turbine itself. The oil supply capacity of the onboard pump group is set according to the amount of lubricating oil under the maximum operating conditions. Therefore, during the starting process and under different operating conditions, the amount of lubricating oil is controlled only based on the driving force of the gas turbine itself, so that the amount of lubricating oil supplied cannot match the operating conditions of the gas turbine. Problems such as oil leakage and high lubricating oil consumption often occur due to excessive oil supply to the gas turbine under low operating conditions. Utility Model Content

[0003] The purpose of the present application is to provide a gas turbine and a lubricating oil system thereof, so as to solve the technical problem that the lubricating oil supply of the gas turbine is poorly matched with the working conditions.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In the first aspect, the present application proposes a lubricating oil system, which is applied to a gas turbine, the gas turbine comprising an onboard pump group, and the lubricating oil system comprising a high-level oil tank; an oil supply pipeline and an oil return pipeline; the input end of the oil supply pipeline is connected to the high-level oil tank, and the output end is connected to the gas turbine; the onboard pump group is connected to the oil supply pipeline; the input end of the return oil pipeline is connected to the return oil inlet of the onboard pump group, and the output end is connected to the high-level oil tank; an oil supply bypass, the input end of which is connected to the output end of the onboard pump group, and the output end is connected to the high-level oil tank; a self-operated differential pressure regulating valve is arranged on the oil supply bypass.

[0006] As a specific solution in the technical solution of the present application, the oil supply bypass also includes a first control valve and a throttling orifice plate connected in parallel with the self-operated differential pressure regulating valve.

[0007] As a specific solution in the technical solution of the present application, it also includes: an electric heater for heating the lubricating oil inside the high-position oil tank; and an oil cooler arranged in the oil return pipeline.

[0008] As a specific solution in the technical solution of the present application, it also includes a first filter and / or a second filter; the first filter is arranged in the oil supply pipeline, and the first filter is located between the self-operated differential pressure regulating valve and the onboard pump group; the second filter is arranged inside the high-level oil tank and is connected to the input end of the oil supply pipeline.

[0009] As a specific scheme in the technical scheme of the present application, it also includes a sub-return oil circuit; the input end of the sub-return oil circuit is connected with the return oil inlet of the onboard pump group, and the output end is connected with the return oil pipeline, and the sub-return oil circuit is located between the oil cooler and the onboard pump group; a chip alarm and an oil return pump group are arranged on the sub-return oil circuit; the chip alarm and the oil return pump group are arranged in sequence according to the flow direction of the lubricating oil.

[0010] As a specific solution in the technical solution of the present application, an oil-gas separator is further provided inside the high-position oil tank, and the oil-gas separator is connected to the output end of the oil return pipeline.

[0011] As a specific solution in the technical solution of the present application, it also includes an oil return gas pipeline, the inlet and outlet ends of the oil return gas pipeline are connected to the high-level oil tank, and an oil mist separator is provided at the output end.

[0012] As a specific solution in the technical solution of the present application, the oil supply pipeline is also provided with a first pressure sensor, and the first pressure sensor is located between the self-operated differential pressure regulating valve and the onboard pump group; the oil return pipeline is also provided with a first temperature sensor.

[0013] As a specific solution in the technical solution of the present application, a second temperature sensor and a second pressure sensor are provided in the high-level oil tank; and a second control valve is provided in the oil supply pipeline.

[0014] In a second aspect, the present application provides a gas turbine, comprising a lubricating oil system as described in any one of the first aspects.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] The present application is based on the working characteristics of the self-operated differential pressure regulating valve. By comparing the oil supply pressure with the bearing chamber pressure, the oil supply amount is better matched with the gas turbine operating condition. By automatically adjusting the opening of the self-operated differential pressure regulating valve, the oil supply amount of the gas turbine lubricating oil is changed to ensure that the oil supply demand of the gas turbine lubricating oil can be met within the entire operating range of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a lubricating oil system proposed in an embodiment of the present application.

[0018] In the figure: 1. oil mist separator; 2. oil cooler; 3. chip alarm; 4. oil return pump group; 5. electric heater; 6. high-level oil tank; 7. oil-gas separator; 8. throttling orifice; 9. first control valve; 10. first filter; 11. self-operated differential pressure regulating valve; 12. onboard pump group; 13. second control valve; 14. first temperature sensor; 15. first pressure sensor; 16. second filter; 17. lubricating oil; 18. gas turbine; 19. second temperature sensor; 20. second pressure sensor. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that, in the description of the present application, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0021] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0023] Before understanding the technical solution of the present application, it should be clear that the lubricating oil sealing structure in the gas turbine generally adopts a gas seal method of comb teeth and graphite to prevent lubricating oil leakage. When the operating condition of the gas turbine is low, the rotor speed is low, resulting in a low gas pressure in the seal and a poor sealing effect. If the lubricating oil supply of the gas turbine is large (that is, the oil supply pressure is large) under low operating conditions, it is easy for the lubricating oil to leak from the seal. If the lubricating oil leaks, the consumption of the lubricating oil will definitely increase.

[0024] In order to solve the technical problems mentioned above, the present application proposes an embodiment of a lubricating oil system, which is applied to a gas turbine 18. The gas turbine 18 includes an onboard pump group 12. The lubricating oil system includes a high-level oil tank 6, an oil supply pipeline, an oil return pipeline, an oil supply bypass, and a self-operated differential pressure regulating valve 11. It is easy to understand that the oil supply pipeline is used to transport the lubricating oil in the high-level oil tank 6 to the gas turbine 18; the oil return pipeline is used to return the lubricating oil in the gas turbine 18 to the high-level oil tank 6; and the oil supply bypass is used for the excess lubricating oil in the oil supply pipeline to overflow back to the high-level oil tank 6. Specifically, as Figure 1 As shown, the input end of the oil supply pipeline is connected to the high-level oil tank 6, and the output end of the oil supply pipeline is connected to the gas turbine 18. The input end of the return oil pipeline is connected to the return oil inlet of the onboard pump group 12, and the output end of the return oil pipeline is connected to the high-level oil tank 6. The onboard pump group 12 is connected to the oil supply pipeline to provide power for the oil supply of the gas turbine 18. The input end of the oil supply bypass is connected to the output end of the onboard pump group 12, and the output end of the oil supply bypass is connected to the high-level oil tank 6. The self-operated differential pressure regulating valve 11 is arranged on the oil supply bypass.

[0025] When using, Figure 1 As shown, the onboard pump group 12 sucks the lubricating oil 17 in the high-level oil tank 6 into its boost inlet, and then inputs the lubricating oil 17 from its boost outlet to the self-operated differential pressure regulating valve 11 until the lubricating oil 17 enters the gas turbine 18 through the oil supply pipeline to lubricate various lubrication points in the gas turbine 18. The lubricating oil after lubrication enters the oil return pipeline from the oil return inlet of the onboard pump group 12, and then returns to the high-level oil tank 6 through the oil return pipeline. In this embodiment, the self-operated differential pressure regulating valve 11 controls the opening based on the oil supply pressure in the oil supply pipeline and the lubricating oil pressure inside the bearing cavity in the gas turbine 18, so that the amount of lubricating oil supplied to the gas turbine 18 can match the operating conditions of the gas turbine 18. For example, if the pressure difference between the bearing chamber of the gas turbine 18 and the pressure of the oil supply pipeline increases, the opening of the self-operated differential pressure regulating valve 11 automatically increases, and the amount of lubricating oil overflowing from the oil supply bypass in the oil supply pipeline back to the high-level oil tank 6 increases, that is, the amount of lubricating oil supplied to the gas turbine 18 decreases; if the pressure difference between the bearing chamber of the gas turbine 18 and the pressure of the oil supply pipeline decreases, the opening of the self-operated differential pressure regulating valve 11 automatically decreases, and the amount of lubricating oil overflowing from the oil supply bypass in the oil supply pipeline back to the high-level oil tank 6 decreases, that is, the amount of lubricating oil supplied to the gas turbine 18 increases.

[0026] It should be clear that the embodiments of the present application are based on the working characteristics of the self-operated differential pressure regulating valve. By comparing the oil supply pressure with the bearing chamber pressure, the oil supply is better matched with the gas turbine operating condition. By automatically adjusting the opening of the self-operated differential pressure regulating valve, the oil supply of the gas turbine lubricating oil is changed to ensure that the oil supply demand of the gas turbine lubricating oil can be met within the entire operating range of the gas turbine.

[0027] It should be clear that when the gas turbine 18 is started or in a low operating condition, even if the opening of the self-operated differential pressure regulating valve 11 is adjusted to the maximum, the lubricating oil supplied to the gas turbine 18 may still be excessive. In order to further match the lubricating oil system with the operating condition of the gas turbine 18, in one embodiment of the present application, the oil supply bypass may also include a first control valve 9 and a throttle orifice plate 8 connected in parallel with the self-operated differential pressure regulating valve 11.

[0028] When in use, if the opening of the self-operated differential pressure regulating valve 11 is adjusted to the maximum, and the pressure difference between the bearing chamber of the gas turbine 18 and the pressure of the oil supply pipeline is still too large, the first control valve 9 can be opened. If the first control valve 9 is opened, the lubricating oil in the oil supply pipeline overflowing from the oil supply bypass back to the high-level oil tank 6 will further increase, that is, the lubricating oil supplied to the gas turbine 18 will further decrease.

[0029] In order to control the on-off of the oil supply pipeline, in one embodiment of the present application, the oil supply pipeline is provided with a second control valve 13. It is easy to understand that the second control valve 13 can be a solenoid valve or a manually controlled valve. Figure 1 As shown, before the gas turbine 18 is started, the second control valve 13 is opened in advance; after the gas turbine 18 is shut down, the second control valve 13 is closed to control the on-off of the oil supply pipeline.

[0030] In order to monitor the temperature and pressure inside the high-position oil tank 6, in one embodiment of the present application, a second temperature sensor 19 and a second pressure sensor 20 are provided in the high-position oil tank 6. In the embodiment of the present application, there is no limitation on the position of the second temperature sensor 19 and the second pressure sensor 20 in the high-position oil tank 6. For example, the second temperature sensor 19 and the second pressure sensor 20 can be provided on the side wall of the high-position oil tank 6, or can be provided on the side wall of the high-position oil tank 6. Figure 1 As shown, the second temperature sensor 19 and the second pressure sensor 20 are installed on the top cover plate of the high-position oil tank 6 .

[0031] In order to control the temperature of the lubricating oil 17 in the high-position oil tank 6, in one embodiment of the present application, the lubricating oil system may further include an electric heater 5 and an oil cooler 2. The electric heater 5 is used to heat the lubricating oil 17 inside the high-position oil tank 6. The oil cooler 2 is arranged in the return oil pipeline, and is used to cool down the lubricating oil in the return oil pipeline for inputting into the high-position oil tank 6. It is easy to understand that if the temperature of the lubricating oil 17 in the high-position oil tank 6 is low, the lubricating oil 17 can be heated and heated by the electric heater 5, or the heat exchange power of the oil cooler 2 can be reduced to increase the temperature of the lubricating oil 17 input into the high-position oil tank 6 in the return oil pipeline; if the temperature of the lubricating oil 17 in the high-position oil tank 6 is high, the electric heater 5 can be turned off, or the heat exchange power of the oil cooler 2 can be increased to reduce the temperature of the lubricating oil 17 input into the high-position oil tank 6 in the return oil pipeline.

[0032] In order to prevent impurities in the high-level oil tank 6 from being input into the bearing cavity of the gas turbine 18 and damaging the gas turbine 18. In one embodiment of the present application, the lubricating oil system may also include a first filter 10. The first filter 10 is arranged in the oil supply pipeline, and the first filter 10 is located between the self-operated differential pressure regulating valve 11 and the onboard pump group 12. In other words, the lubricating oil entering the gas turbine 18 through the oil supply pipeline must pass through the first filter 10. In other words, the first filter 10 can filter impurities in the lubricating oil 17 in the oil supply pipeline to prevent impurities from entering the bearing cavity of the gas turbine 18. In the embodiment of the present application, there is no limitation on the type of the first filter 10. For example, the first filter 10 can be as follows Figure 1 Duplex filter shown.

[0033] In another embodiment of the present application, the lubricating oil system may further include a second filter 16. The second filter 16 is disposed inside the high-position oil tank 6 and is connected to the input end of the oil supply pipeline. By providing the second filter 16, impurities in the lubricating oil 17 in the oil supply pipeline can also be filtered to prevent the impurities from entering the bearing cavity of the gas turbine 18. In the embodiment of the present application, there is no restriction on the type of the second filter 16. For example, the second filter 16 may be Figure 1 Suction filter shown.

[0034] It is easy to understand that in one embodiment of the present application, in order to improve the filtering effect, the following can be done: Figure 1 As shown, the lubricating oil system may include both a first filter 10 and a second filter 16 .

[0035] It should be clear that in order to monitor whether the transmission bearings and transmission gears in the gas turbine 18 are damaged, in one embodiment of the present application, a chip alarm 3 is also provided in the oil return line. The lubricating oil 17 in the oil return line is monitored by the chip alarm 3. If the lubricating oil 17 in the oil return line contains chips, it means that the transmission bearings and transmission gears in the gas turbine 18 are damaged and need to be shut down for inspection or maintenance in a timely manner.

[0036] It should be clear that relying solely on the onboard pump group 12 of the gas turbine 18 as the power source of the lubricating oil system may be difficult to meet the oil return demand of the lubricating oil 17 when the gas turbine 18 is in full working condition. During use, if the onboard pump group 12 is turned to the maximum power and cannot meet the power demand for the return of the lubricating oil 17 in the entire lubricating oil system, the return oil pump group 4 is turned on, and the return oil pump group 4 can pump the lubricating oil 17 in the onboard pump group 12 to the high-level oil tank 6. It is easy to understand that if the driving force provided by the onboard pump group 12 can meet the power demand for the return of the lubricating oil 17 in the lubricating oil system, there is no need to turn on the return oil pump group 4. In other words, by setting the return oil pump group 4 on the sub-return oil line, the working condition matching of the lubricating oil system and the gas turbine 18 in the embodiment of the present application can be further improved.

[0037] It should be clear that the oil entering the high-position oil tank 6 from the oil return pipeline exists in the state of oil and gas. In order to retain the lubricating oil 17 in the oil and gas in the high-position oil tank 6 and discharge the gas to the outside of the high-position oil tank 6, in one embodiment of the present application, an oil-gas separator 7 is further provided inside the high-position oil tank 6, and the oil-gas separator 7 is connected to the output end of the oil return pipeline. By providing the oil-gas separator 7, the lubricating oil 17 in the state of oil and gas can be retained in the high-position oil tank 6.

[0038] In order to discharge the gas in the oil and gas to the high-level oil tank 6, as Figure 1 As shown, the lubricating oil system also includes an oil return gas pipeline, the inlet and outlet of which are connected to the high-level oil tank 6, and can discharge the gas in the high-level oil tank 6 to the outside of the high-level oil tank 6. It should be clear that the gas discharged from the high-level oil tank 6 exists in the form of oil mist, that is, the gas in the high-level oil tank 6 still contains lubricating oil 17. In order to collect and reuse the lubricating oil 17 in the gas discharged from the high-level oil tank 6, in one embodiment of the present application, an oil mist separator 1 is provided at the output end of the oil return gas pipeline. Figure 1 As shown, by setting the oil mist separator 1, the lubricating oil 17 in the exhaust gas from the high-level oil tank 6 can be collected and reused.

[0039] It should be clear that in order to monitor the oil supply pressure in the oil supply pipeline, in one embodiment of the present application, the oil supply pipeline is also provided with a first pressure sensor 15, and the first pressure sensor 15 is located between the self-operated differential pressure regulating valve 11 and the onboard pump group 12. In order to monitor the temperature of the lubricating oil 17 in the return oil pipeline and avoid abnormal temperature of the return oil pipeline, the return oil pipeline is also provided with a first temperature sensor 14.

[0040] The embodiment of the lubricating oil system proposed in the present application is based on the working characteristics of the self-operated differential pressure regulating valve. By comparing the oil supply pressure with the bearing chamber pressure, the oil supply amount is better matched with the gas turbine operating condition. By automatically adjusting the opening of the self-operated differential pressure regulating valve, the oil supply amount of the gas turbine lubricating oil is changed to ensure that the oil supply demand of the gas turbine lubricating oil can be met within the entire operating range of the gas turbine.

[0041] After introducing all the embodiments of the lubricating oil system proposed in the present application, an embodiment of a gas turbine proposed in the present application is introduced below. Specifically, the gas turbine includes the lubricating oil system proposed in any one of the above embodiments.

[0042] It should be clear that since the gas turbine in the embodiment of the present application has a lubricating oil system as described above, the gas turbine proposed in the present application can also be based on the working characteristics of the self-operated differential pressure regulating valve. By comparing the oil supply pressure with the bearing chamber pressure, the oil supply amount can be better matched with the gas turbine operating condition. By automatically adjusting the opening of the self-operated differential pressure regulating valve, the oil supply amount of the gas turbine lubricating oil is changed to ensure that the oil supply demand of the gas turbine lubricating oil can be met within the entire operating range of the gas turbine.

[0043] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A lubricating oil system, applied to a gas turbine (18), the gas turbine (18) comprising an onboard pump unit (12), characterized in that: The lubricating oil system comprises: High level fuel tank (6); An oil supply pipeline and an oil return pipeline; the input end of the oil supply pipeline is connected to the high-position oil tank (6), and the output end is connected to the gas turbine (18); the onboard pump group (12) is connected to the oil supply pipeline; the input end of the oil return pipeline is connected to the oil return inlet of the onboard pump group (12), and the output end is connected to the high-position oil tank (6); An oil supply bypass, the input end of which is connected to the output end of the onboard pump group (12), and the output end of which is connected to the high-position oil tank (6); A self-operated differential pressure regulating valve (11) is arranged in the oil supply bypass.

2. The lubricating oil system according to claim 1, characterized in that: The oil supply bypass further comprises a first control valve (9) and a throttling orifice plate (8) connected in parallel with the self-operated differential pressure regulating valve (11).

3. The lubricating oil system according to claim 1, characterized in that: Also includes: An electric heater (5) for heating the lubricating oil (17) inside the high-position oil tank (6); An oil cooler (2) is arranged on the oil return pipeline.

4. The lubricating oil system according to claim 1, characterized in that: It also includes a first filter (10) and / or a second filter (16); the first filter (10) is arranged in the oil supply pipeline, and the first filter (10) is located between the self-operated differential pressure regulating valve (11) and the onboard pump group (12); the second filter (16) is arranged inside the high-level oil tank (6) and is connected to the input end of the oil supply pipeline.

5. The lubricating oil system according to claim 3, characterized in that: It also includes a sub-return oil circuit; the input end of the sub-return oil circuit is connected to the return oil inlet of the onboard pump group (12), and the output end is connected to the return oil pipeline, and the sub-return oil circuit is located between the oil cooler (2) and the onboard pump group (12); a chip alarm (3) and an oil return pump group (4) are arranged on the sub-return oil circuit; the chip alarm (3) and the oil return pump group (4) are arranged in sequence according to the flow direction of the lubricating oil.

6. The lubricating oil system according to claim 1, characterized in that: An oil-gas separator (7) is also provided inside the high-position oil tank (6), and the oil-gas separator (7) is connected to the output end of the oil return pipeline.

7. The lubricating oil system according to claim 1, characterized in that: It also comprises an oil return gas pipeline, the inlet and outlet ends of the oil return gas pipeline are connected to the high-position oil tank (6), and an oil mist separator (1) is arranged at the output end.

8. The lubricating oil system according to claim 1, characterized in that: The oil supply pipeline is also provided with a first pressure sensor (15), and the first pressure sensor (15) is located between the self-operated differential pressure regulating valve (11) and the onboard pump group (12); the oil return pipeline is also provided with a first temperature sensor (14).

9. The lubricating oil system according to any one of claims 1 to 8, characterized in that: The high-position oil tank (6) is provided with a second temperature sensor (19) and a second pressure sensor (20); and the oil supply pipeline is provided with a second control valve (13).

10. A gas turbine, characterized in that: Comprising a lubricating oil system as claimed in any one of claims 1 to 9.

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