Compressed gas energy storage system and its compressor guide vane regulation system

Abstract

The embodiment of the present application discloses a compressed gas energy storage system and a guide vane adjusting system of a compressor thereof, the guide vane adjusting system comprising: an oil-operated actuator connected to inlet guide vanes of the compressor; the oil-operated actuator is used to drive the inlet guide vanes to adjust to a target opening degree by using anti-combustion oil; a first oil supply device is used to store and provide the anti-combustion oil; a first pressure oil supply pipeline is connected to an inlet flow adjusting mechanism of an expander of the compressed gas energy storage system; a second pressure oil supply pipeline is connected to the oil-operated actuator; the first oil supply device is used to provide the anti-combustion oil to the inlet flow adjusting mechanism of the expander through the first pressure oil supply pipeline and provide the anti-combustion oil to the oil-operated actuator through the second pressure oil supply pipeline. The embodiment of the present application can realize stable control of the inlet guide vanes of the compressor, ensure normal operation conditions of the compressor, and reduce equipment cost and maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a compressed gas energy storage system and a guide vane adjustment system for its compressor. Background Technology

[0002] The application of energy storage technology can largely solve the drawbacks of the volatility and intermittency of new energy power generation, effectively addressing the problem of peak shaving and valley filling, and has received increasing attention in recent years. Among these, compressed air energy storage and gas-liquid phase change carbon dioxide energy storage are typical compressed gas energy storage technologies. In the energy storage stage, surplus electrical energy is used to drive a compressor to compress the energy storage medium (compressed air or carbon dioxide) to high pressure, converting electrical energy into the internal energy of the energy storage medium. In the energy release stage, the high-pressure energy storage medium enters an expander to drive the expander to perform work and output electrical energy. The compressor is the core component in the energy storage stage, and the key to the compressor's performance lies in the inlet guide vanes of the compressor's low-pressure cylinder. During compressor operation, it is necessary to control the inlet guide vane opening and closing and adjust the guide vane opening to ensure the compressor's normal operation. Therefore, the stability of the compressor inlet guide vanes and its control system is extremely important for the normal operation of the entire energy storage system. In existing technologies, pneumatic or electric methods are used to control and adjust the compressor inlet guide vanes. However, pneumatic adjustment is difficult to control the adjustment accuracy, and the driving force of electric and pneumatic drive methods is small, making it difficult to maintain a stable and vibration-free compressor inlet guide vane opening. Especially for compressors in compressed gas energy storage systems, if the guide vane opening cannot be adjusted accurately and stably, it will have a significant impact on the compressor's operating conditions, leading to increased energy consumption and decreased energy storage efficiency. Summary of the Invention

[0003] Therefore, to address the shortcomings of existing technologies, this invention provides a compressed gas energy storage system and its compressor guide vane adjustment system, which can achieve stable control of the compressor inlet guide vanes, ensure the normal operation of the compressor, and reduce equipment costs and maintenance costs.

[0004] An embodiment of the present invention provides a guide vane adjustment system for a compressor of a compressed gas energy storage system, comprising: a hydraulic actuator connected to the inlet guide vane of the compressor; the hydraulic actuator being used to adjust the inlet guide vane to a target opening degree by actuating fire-resistant oil; a first oil supply device for storing and supplying the fire-resistant oil; a first pressure oil supply line having a first input end and a first output end, the first input end being connected to the first oil supply device, and the first output end being connected to the intake volume adjustment mechanism of the expander of the compressed gas energy storage system; a second pressure oil supply line having a second input end and a second output end, the second input end being connected to the first oil supply device, and the second output end being connected to the hydraulic actuator; the first oil supply device being used to supply the fire-resistant oil to the intake volume adjustment mechanism of the expander through the first pressure oil supply line, and to supply the fire-resistant oil to the hydraulic actuator through the second pressure oil supply line.

[0005] In some embodiments, the first oil supply device includes a first oil tank for storing the fire-resistant oil, and the guide vane adjustment system further includes: a second oil supply device for storing and supplying the fire-resistant oil; the second oil supply device has a second oil tank, the storage space of which is independent of that of the first oil tank; a third pressure oil supply line having a third input end and a third output end, the third input end being connected to the second oil supply device, and the third output end being connected to the hydraulic actuator; the second oil supply device is used to supply the fire-resistant oil to the hydraulic actuator through the third pressure oil supply line.

[0006] In some embodiments, a first valve is provided on the first pressure oil supply line, a second valve is provided on the second pressure oil supply line, and a third valve is provided on the third pressure oil supply line; the guide vane adjustment system switches the oil supply mode by switching the first valve, the second valve, and the third valve between an open state and a closed state, respectively.

[0007] In some embodiments, during the energy storage phase of the compressed gas energy storage system, the oil supply mode is a first oil supply mode or a second oil supply mode; in the first oil supply mode, the first valve and the second valve are closed, the third valve is open, and the second oil supply device supplies the fire-resistant oil to the hydraulic actuator through the third pressure oil supply line; in the second oil supply mode, the first valve and the third valve are closed, the second valve is open, and the first oil supply device supplies the fire-resistant oil to the hydraulic actuator through the second pressure oil supply line; and / or, during the energy release phase of the compressed gas energy storage system, the oil supply mode is a third oil supply mode, the first valve is open, the second valve and the third valve are closed, and the first oil supply device supplies the fire-resistant oil to the expander's intake volume regulating mechanism through the first pressure oil supply line.

[0008] In some embodiments, the guide vane adjustment system further includes a first unpressurized return oil line and a second unpressurized return oil line. The first unpressurized return oil line is connected between the hydraulic actuator and the first oil tank, and the second unpressurized return oil line is connected between the hydraulic actuator and the second oil tank. A fourth valve is provided on the first unpressurized return oil line, and a fifth valve is provided on the second unpressurized return oil line. The return oil mode is switched by switching between an open state and a closed state through the fourth valve and the fifth valve, respectively.

[0009] In some embodiments, during the energy storage phase of the compressed gas energy storage system, the oil return mode is a first oil return mode, a second oil return mode, or a third oil return mode; in the first oil return mode, the fourth valve is in a closed state and the fifth valve is in an open state; in the second oil return mode, the fourth valve is in an open state and the fifth valve is in a closed state; in the third oil return mode, both the fourth valve and the fifth valve are in an open state.

[0010] In some embodiments, the first fuel supply device further includes a regeneration device, the inlet and outlet of which are respectively connected to the first fuel tank, and the regeneration device is used to regenerate the fire-resistant oil in the first fuel tank and then return it to the first fuel tank.

[0011] In some embodiments, the guide vane adjustment system includes a fire-resistant oil regeneration mode; in the fire-resistant oil regeneration mode, during the energy storage phase of the compressed gas energy storage system, the second oil supply device provides the fire-resistant oil to the hydraulic actuator, and at least part of the return oil from the hydraulic actuator flows back to the first oil tank via the first unpressurized return oil pipeline and mixes with the fire-resistant oil originally stored in the first oil tank, and the regeneration device regenerates the fire-resistant oil in the first oil tank.

[0012] In some embodiments, the guide vane adjustment system further includes an operating parameter detection component connected to the second oil supply device. The operating parameter detection component is used to detect the operating parameters of the second oil supply device to control the state switching of the first valve, the second valve, and the third valve based on the detection results of the operating parameter detection component.

[0013] This invention also provides a compressed gas energy storage system, comprising: a gas storage tank, an energy storage component, an energy storage container, and an energy release component connected in a closed loop in sequence; the energy storage component includes a compressor, and the energy release component includes an expander; the compressed gas energy storage system further includes the guide vane adjustment system described in any one of the preceding claims.

[0014] As can be seen from the above, the embodiments of the present invention can achieve one or more of the following beneficial effects: In this embodiment, the compressor inlet guide vane can be adjusted to the target opening degree by hydraulically driving the first oil supply device and the hydraulic actuator. Compared with electric or pneumatic methods, this embodiment can provide greater driving force, which is more suitable for the opening degree control of the compressor inlet guide vane in the compressed gas energy storage system. It can better prevent vibration and thus achieve precise and stable adjustment, ensuring the normal and efficient operation of the compressor. Furthermore, the first oil supply device used in the guide vane adjustment system provided in this embodiment can realize that the opening degree adjustment of the compressor inlet guide vane and the air intake adjustment mechanism of the expander share a set of oil supply devices, without the need to set up additional pneumatic or electric devices, which can reduce equipment investment costs. Moreover, since the energy storage stage and the energy release stage are carried out in different time periods, that is, the compressor inlet guide vane and the air intake adjustment mechanism of the expander reuse the first oil supply device in different time periods, which can also reduce equipment investment costs, improve equipment utilization, and provide power to the compressor inlet guide vane without affecting the power supply to the air intake adjustment mechanism of the expander. Attached Figure Description

[0015] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the guide vane adjustment system provided in one embodiment of the present invention.

[0017] Figure 2 for Figure 1 The diagram shows the structure of the hydraulic actuator in the guide vane adjustment system.

[0018] Figure 3 for Figure 1 The diagram shows the structure of the first oil supply device in the guide vane adjustment system.

[0019] Figure 4 This is a schematic diagram of the guide vane adjustment system provided in another embodiment of the present invention.

[0020] Figure 5 for Figure 4 A magnified view of a portion of region A in the middle.

[0021] Figure 6 for Figure 4 A magnified view of a portion of region B in the middle.

[0022] Figure 7 This is a schematic diagram of a compressed gas energy storage system provided in one embodiment of the present invention.

[0023] [Explanation of Labels in the Attached Image]

[0024] 100. Guide vane adjustment system; 10. Inlet guide vane; 20. Hydraulic actuator; 21. Hydraulic motor; 22. Electro-hydraulic servo module; 23. Displacement sensor; 30. First oil supply device; 31. First oil tank; 32. Regeneration device; 33. First oil pump assembly; 331. First high-pressure oil pump; 34. First overflow valve; 35. First energy storage device; 36. First oil supply pressure detection device; 37. First circulating pump; 38. First cooler; 39. First liquid level detection device; 41. First pressure oil supply pipeline; 411. First valve; 42. Second pressure oil supply pipeline; 421. Second valve; 43. Third pressure oil supply pipeline; 431. Third valve; 44. First unpressurized return oil line; 441. Fourth valve; 45. Second unpressurized return oil line; 451. Fifth valve; 46. Sixth return oil line; 50. Second oil supply device; 51. Second oil tank; 52. Second oil pump assembly; 53. Second overflow valve; 54. Second oil supply pressure detection device; 55. Second energy storage device; 56. Second circulating pump; 58. Second cooler; 59. Second liquid level detection device; 200. Gas storage tank; 300. Energy storage assembly; 301. Compressor; 400. Energy storage container; 500. Energy release assembly; 501. Expander; 5011: Expander intake volume adjustment mechanism. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] It should also be noted that the division of multiple embodiments in this invention is only for the convenience of description and should not constitute a special limitation. Features in various embodiments can be combined and referenced in each other without contradiction.

[0029] like Figure 1 As shown, an embodiment of the present invention provides a guide vane adjustment system 100 for a compressor of a compressed gas energy storage system. The guide vane adjustment system 100 includes a hydraulic actuator 20, a first oil supply device 30, a first pressure oil supply line 41, and a second pressure oil supply line 42.

[0030] The hydraulic actuator 20 is connected to the inlet guide vane 10 of the compressor. The hydraulic actuator 20 is used to actuate the fire-resistant oil to adjust the inlet guide vane 10 to a target opening. A first oil supply device 30 is used to store and supply fire-resistant oil, and includes a first oil tank 31 for storing the fire-resistant oil. A first pressure oil supply line 41 has a first input end and a first output end; the first input end is connected to the first oil supply device 30, and the first output end is connected to the intake air volume regulating mechanism 5011 of the expander in the compressed gas energy storage system. A second pressure oil supply line 42 has a second input end and a second output end; the second input end is connected to the first oil supply device 30, and the second output end is connected to the hydraulic actuator 20. The first oil supply device 30 is used to supply fire-resistant oil to the intake air volume regulating mechanism 5011 of the expander through the first pressure oil supply line 41, and to supply fire-resistant oil to the hydraulic actuator 20 through the second pressure oil supply line 42.

[0031] Reference Figure 2 For example, the hydraulic actuator 20 includes a hydraulic motor 21, an electro-hydraulic servo module 22, and a displacement sensor 23. When fire-resistant oil is supplied to the hydraulic actuator 20, the electro-hydraulic servo module 22 adjusts the angle of the inlet guide vane 10 as needed to either open or close, selecting to guide the fire-resistant oil into the corresponding chamber of the hydraulic motor 21, for example, referring to... Figure 2When it is necessary to increase the angle of the inlet guide vane 10, fire-resistant oil is introduced into the chamber on the left side of the hydraulic actuator 21, causing the hydraulic actuator 21 to pull the inlet guide vane 10 to the right, thus increasing the opening of the inlet guide vane 10. When it is necessary to decrease the angle of the inlet guide vane 10, fire-resistant oil is introduced into the chamber on the right side of the hydraulic actuator 21, causing the hydraulic actuator 21 to push the inlet guide vane 10 to the left, thus decreasing the opening of the inlet guide vane 10. The displacement sensor 23 senses the displacement distance of the hydraulic actuator 21 to determine whether the inlet guide vane 10 has been adjusted to the target opening. Once the target opening is reached, the electro-hydraulic servo module 22 blocks the oil inlet, stopping the oil supply to the hydraulic actuator 20, thus maintaining the compressor inlet guide vane 10 at the target opening.

[0032] Reference Figure 3 The first oil tank 31 in the first oil supply device 30 is used to store fire-resistant oil. The fire-resistant oil is, for example, phosphate ester 46# fire-resistant oil that meets the quality standards for power plant operation in DL / T571-2014. The operating temperature of the fire-resistant oil is, for example, 38-45℃.

[0033] The first fuel supply device 30 also includes a first fuel pump assembly 33 connected to a first fuel tank 31, and a first energy storage device 35 connected to the outlet pipeline of the first fuel pump assembly 33. The first fuel pump assembly 33 is used to pump fire-resistant oil from the first fuel tank 31 and output it through a first pressure fuel supply pipeline 41 or a second pressure fuel supply pipeline 42. The first fuel pump assembly 33 may include, for example, multiple first high-pressure fuel pumps 331 connected in parallel. The multiple first high-pressure fuel pumps 331 can operate alternately, and other first high-pressure fuel pumps 331 can be activated to work during the failure of one first high-pressure fuel pump 331, thereby improving the stability of the first fuel supply device 30. The first high-pressure fuel pump 331 may be, for example, a constant pressure variable displacement plunger pump, with an operating pressure of, for example, 14.5 ± 0.5 MPa. The first energy storage device 35 is used to reduce pressure fluctuations, compensate for flow rate changes, and improve fuel supply quality. The first energy storage device 35 may contain, for example, a nitrogen-filled gasbag with a nitrogen filling pressure of 10 ± 0.5 MPa. When the first high-pressure oil pump 331 is working, it draws fire-resistant oil from the first oil tank 31. The pressurized oil exiting the first high-pressure oil pump 331 enters the first energy storage device 35, thus filling the first energy storage device; the other path outputs the oil through the first pressure supply line 41 or the second pressure supply line 42. During the filling process, the flow rate gradually decreases, and the oil pressure begins to rise. When the oil pressure reaches the adjustment pressure of the first high-pressure oil pump 331, the variable mechanism of the first high-pressure oil pump 331 activates and changes the output flow rate of the first high-pressure oil pump 331 until the output flow rate of the first high-pressure oil pump 331 matches the required oil consumption. At this point, the variable mechanism maintains a certain position, thereby stabilizing the oil pressure at 14.5 ± 0.5 MPa. When the oil consumption changes, the first high-pressure oil pump 331 automatically adjusts the output flow rate.

[0034] Reference Figure 3The first oil supply device 30, for example, also includes a first overflow valve 34 to return excess fire-resistant oil pumped out by the first oil pump assembly 33 to the first oil tank 31. The set pressure of the first overflow valve 34 is, for example, 16.5 ± 0.5 MPa. The first oil supply device 30 also includes, for example, a first circulation pump 37 and a first cooler 38. When heat is generated during operation, causing the temperature of the fire-resistant oil to rise, the first circulation pump 37 can pump the fire-resistant oil in the first oil tank 31 to the first cooler 38 for cooling before returning it to the first oil tank 31, thus achieving circulating cooling to maintain the oil temperature within the set operating temperature range. The first oil supply device 30 also includes, for example, a heater for heating the fire-resistant oil in the first oil tank 31 to the operating temperature range. The first oil supply device 30 also includes, for example, a first oil supply pressure detection device 36 installed on the outlet pipe of the first oil pump assembly 33. The first oil supply pressure detection device 36 includes, for example, a pressure sensor for detecting the oil supply pressure of the first oil supply device 30. The first fuel supply device 30 may also include, for example, a first liquid level detection device 39 connected to the first fuel tank 31. The first liquid level detection device 39 is used to detect the liquid level of fire-resistant oil in the first fuel tank 31. In this embodiment, the first oil pump assembly 33, the first overflow valve 34, the first energy storage device 35, the first fuel supply pressure detection device 36, the first circulation pump 37, the first cooler 38, and the first liquid level detection device 39 in the first fuel supply device 30 can be selected from conventional oil systems, including oil pumps, overflow valves, energy storage devices, fuel supply pressure detectors, circulation pumps, coolers, and liquid level gauges. This embodiment is not limited to these components.

[0035] The second pressure oil supply line 42 can provide fire-resistant oil for adjusting the angle of the compressor inlet guide vane 10, and the first pressure oil supply line 41 can provide fire-resistant oil for the intake volume adjustment mechanism 5011 of the expander in the compressed gas energy storage system. The compressed gas energy storage system is, for example, a compressed air energy storage system or a carbon dioxide energy storage system. In the compressed gas energy storage system, the compressor compresses the working gas to achieve energy storage during the energy storage stage, and the expander uses the expansion of the working gas to do work to generate electricity during the energy release stage. Therefore, in this embodiment, the compressor inlet guide vane 10 can be adjusted to the target opening degree by oil driving through the first oil supply device 30 and the oil-driven actuator 20. Compared with electric or pneumatic methods, this embodiment can provide greater driving force, is more suitable for the opening degree control of the compressor inlet guide vane in the compressed gas energy storage system, and can better prevent vibration, thereby achieving precise and stable adjustment and ensuring the normal and efficient operation of the compressor. Furthermore, the first oil supply device 30 used in the guide vane adjustment system 100 provided in this embodiment can realize the sharing of a single oil supply device between the compressor inlet guide vane 10 opening adjustment and the expander intake volume adjustment mechanism 5011, eliminating the need for additional pneumatic or electric devices and reducing equipment investment costs. Moreover, since the energy storage and release phases are performed in separate time periods, i.e., the compressor inlet guide vane 10 and the expander intake volume adjustment mechanism 5011 share the first oil supply device 30 at different times, equipment investment costs can also be reduced, equipment utilization can be improved, and the supply of power to the compressor inlet guide vane 10 does not affect the supply of power to the expander intake volume adjustment mechanism 5011.

[0036] Reference Figure 4 In some embodiments, the guide vane adjustment system 100 further includes a second oil supply device 50. The second oil supply device 50 is used to store and supply fire-resistant oil. The second oil supply device 50 has a second oil tank 51, the storage space of which is independent of the first oil tank 31. A third pressure oil supply line 43 has a third input and a third output; the third input is connected to the second oil supply device 50, and the third output is connected to the hydraulic actuator 20. The second oil supply device 50 is used to supply fire-resistant oil to the hydraulic actuator 20 through the third pressure oil supply line 43.

[0037] Reference Figure 4 The third pressure oil supply line 43 and the second pressure oil supply line 42 can be interconnected and then connected to the hydraulic actuator 20, or they can be connected separately to the hydraulic actuator 20. (Refer to...) Figure 5The second oil supply device 50 also includes a second oil pump assembly 52 connected to the second oil tank 51, and a second energy storage device 55 connected to the outlet pipeline of the second oil pump assembly 52. ​​The second oil pump assembly 52 is used to pump the fire-resistant oil from the second oil tank 51 and output it through the second pressure oil supply pipeline 42. The fire-resistant oil stored in the second oil tank 51 is the same as the fire-resistant oil stored in the first oil tank 31, both being factory-grade phosphate ester 46# fire-resistant oil, with an operating temperature of, for example, 38-45℃. The second oil pump assembly 52 includes, for example, a second high-pressure oil pump, which is a constant-pressure variable displacement plunger pump with an operating pressure of, for example, 14.5±0.5MPa. The second energy storage device 55 is used to reduce pressure fluctuations, compensate for flow rate changes, and improve the quality of oil supply. The second energy storage device 55 is, for example, equipped with a nitrogen-filled gasbag with a nitrogen filling pressure of 10±0.5MPa. The second oil supply device 50 also includes, for example, a second overflow valve 53 for returning excess fire-resistant oil from the fire-resistant oil pumped out by the second oil pump assembly 52 to the second oil tank 51. The set pressure of the second overflow valve 53 is, for example, 16.5 ± 0.5 MPa. (Refer to...) Figure 6 The second fuel supply device 50 may also include, for example, a second circulation pump 56 and a second cooler 58. The second circulation pump 56 can pump the fire-resistant oil in the second fuel tank 51 to the second cooler 58 for cooling and then return it to the second fuel tank 51, achieving a circulating cooling effect. The second fuel supply device 50 may also include, for example, a heating device for heating the fire-resistant oil in the second fuel tank 51 to the operating temperature. In this embodiment, the second oil pump assembly 52, the second overflow valve 53, the second energy storage device 55, the second circulation pump 56, and the second cooler 58 in the second fuel supply device 50 can be selected from oil pumps, overflow valves, energy storage devices, circulation pumps, and coolers in conventional oil systems; this embodiment is not limited to these components.

[0038] By setting up a second oil supply device 50, different oil supply modes can be adopted for the hydraulic actuator 20 according to different operating conditions. For example, in one mode, the second oil supply device 50 can independently supply oil to the hydraulic actuator 20 through the third pressure oil supply line 43, while the first oil supply device 30 independently supplies oil to the expander's air intake regulating mechanism 5011. In another mode, the first oil supply device 30 can supply oil to both the hydraulic actuator 20 and the expander's air intake regulating mechanism 5011. That is, oil can be supplied to the hydraulic actuator 20 by either the first oil supply device 30 or the second oil supply device 50. The second oil supply device 50 can be considered as the main oil station, and the first oil supply device 30 can be considered as the backup oil station. This provides a backup oil station for the hydraulic actuator 20, which can improve the stability of the system's oil supply. Furthermore, since the backup oil station is the oil station for the expander's air intake regulating mechanism 5011, it can reduce equipment investment costs and improve the utilization rate of existing equipment.

[0039] In some embodiments, a fourth pressure oil supply line (not shown in the figure) may also be provided in the guide vane adjustment system 100. The fourth pressure oil supply line has a fourth input end and a fourth output end. The fourth input end is connected to the second oil supply device, and the fourth output end is connected to the expander's air intake adjustment mechanism 5011. Similar to the principle of the first oil supply device 30 connecting the first pressure oil supply line 41 and the second pressure oil supply line 42, the second oil supply device 50 can supply oil to the hydraulic actuator 20 through the third pressure oil supply line 43, and can also supply oil to the expander's air intake adjustment mechanism 5011 through the fourth pressure oil supply line.

[0040] For example, during normal operation in the energy storage phase, the second oil supply device 50 supplies oil to the hydraulic actuator 20, and the first oil supply device 30 is shut down. In the energy release phase, the first oil supply device 30 supplies oil to the expander's intake air volume regulating mechanism 5011, and the second oil supply device 50 is shut down. If the second oil supply device 50 malfunctions while in the energy storage phase, it can be shut down, and the first oil supply device 30 can supply oil to the hydraulic actuator 20 through the second pressure oil supply line 42, ensuring normal operation during the energy storage phase. If the first oil supply device 30 malfunctions while in the energy release phase, it can be shut down, the first pressure oil supply line 41 can be closed, and the second oil supply device 50 can be started to supply oil to the expander's intake air volume regulating mechanism 5011 through the fourth pressure oil supply line, ensuring normal operation during the energy release phase. During the operation of the compressed gas energy storage system, the energy storage phase and the energy release phase are not carried out simultaneously. Therefore, the guide vane adjustment system 100 is equipped with two sets of oil supply devices, namely the first oil supply device 30 and the second oil supply device 50. During the energy storage phase, one device can be used and the other can be kept on standby to supply oil to the hydraulic actuator 20. During the energy release phase, one device can be used and the other can be kept on standby to supply oil to the air intake adjustment mechanism 5011 of the expander. This not only provides a backup oil station for the corresponding equipment (hydraulic actuator 20 and air intake adjustment mechanism 5011 of the expander), but also reduces equipment investment costs and improves equipment utilization.

[0041] More specifically, refer to Figure 4A first valve 411 is installed on the first pressure oil supply line 41, a second valve 421 is installed on the second pressure oil supply line 42, and a third valve 431 is installed on the third pressure oil supply line 43. The guide vane adjustment system 100 switches the oil supply mode by switching between an open state and a closed state through the first valve 411, the second valve 421, and the third valve 431, respectively. The first valve 411, the second valve 421, and the third valve 431 are, for example, solenoid valves or electric valves, to automatically control the switching between open and closed states according to the set oil supply mode. In some embodiments, the first valve 411, the second valve 421, and the third valve 431 can also be manually adjustable valves, allowing the operator to manually control the switching of states. By using the first valve 411, the second valve 421, and the third valve 431, different oil supply modes can be selected under different operating conditions of the guide vane adjustment system 100, making control more flexible and facilitating maintenance.

[0042] Specifically, during the energy storage phase of the compressed gas energy storage system, the oil supply mode is either the first oil supply mode or the second oil supply mode. In the first oil supply mode, the first valve 411 and the second valve 421 are closed, the third valve 431 is open, and the second oil supply device 50 is activated, supplying fire-resistant oil to the hydraulic actuator 20 via the third pressure oil supply line 43. In the second oil supply mode, the first valve 411 and the third valve 431 are closed, the second valve 421 is open, and the first oil supply device 30 is activated, supplying fire-resistant oil to the hydraulic actuator 20 via the second pressure oil supply line 42. For example, under normal operating conditions using the first oil supply mode, if the second oil supply device 50 malfunctions (e.g., severe leakage in the second oil tank 51, excessively high temperature of the fire-resistant oil in the second oil tank 51 exceeding normal operating temperature, deterioration of oil quality in the second oil tank 51, abnormal operation of the second circulating pump 56, or abnormal oil supply pressure due to a malfunction of the second overflow valve 53), requiring the second oil supply device 50 to be shut down for maintenance, the oil supply mode can be switched to the second oil supply mode. Fire-resistant oil is then supplied to the hydraulic actuator 20 via the second pressure oil supply line 42 through the first oil supply device 30, thereby ensuring normal oil supply to the hydraulic actuator 20 during the energy storage phase and ensuring stable control of the compressor inlet guide vane 10 opening. Furthermore, during the energy storage phase, the first oil supply device 30 does not need to supply oil to the expander's intake volume regulation mechanism 5011; therefore, using the first oil supply device 30 as a backup oil station will not negatively impact the expander's intake volume regulation. Of course, when the second oil supply device 50 is functioning normally without malfunction, the first oil supply mode and the second oil supply mode can be operated separately at different times. For example, during the energy storage phase, the first oil supply mode and the second oil supply mode can be operated alternately. Therefore, this embodiment provides two different oil supply modes during the energy storage phase to meet the normal oil supply to the hydraulic actuator 20 under different operating conditions, so as to achieve precise and stable control of the compressor inlet guide vane 10.

[0043] During the energy release phase of the compressed gas energy storage system, the oil supply mode is the third oil supply mode. The first valve 411 is open, the second valve 421 and the third valve 431 are closed, and the first oil supply device 30 is in the start-up state (at this time, the second oil supply device 50 can be completely or partially shut down). The first oil supply device 30 supplies fire-resistant oil to the expander's intake volume regulating mechanism 5011 through the first pressure oil supply pipeline 41. That is, by switching the states of the first valve 411, the second valve 421 and the third valve 431, the first oil supply device 30 can supply oil to the hydraulic actuator 20 in the first operating mode during the energy storage phase, and can also supply oil to the expander's intake volume regulating mechanism 5011 in the third operating mode during the energy release phase, thus making full use of the first oil supply device 30.

[0044] In some embodiments, the guide vane adjustment system 100 further includes a first unpressurized return oil line 44 and a second unpressurized return oil line 45. The first unpressurized return oil line 44 is connected between the hydraulic actuator 20 and the first oil tank 31, and the second unpressurized return oil line 45 is connected between the hydraulic actuator 20 and the second oil tank 51. A fourth valve 441 is provided on the first unpressurized return oil line 44, and a fifth valve 451 is provided on the second unpressurized return oil line 45. The return oil mode is switched by switching between an open state and a closed state through the fourth valve 441 and the fifth valve 451, respectively. The fourth valve 441 and the fifth valve 451 can be solenoid valves or electric valves, which can automatically control the switching of the open and closed states according to the designed return oil mode. Of course, they can also be manual valves, and the switching of states can be manually adjusted by the operator. During the process of supplying fire-resistant oil to the hydraulic actuator 20, the volume of fire-resistant oil in one chamber of the hydraulic actuator 21 gradually increases, while the fire-resistant oil in the other chamber needs to be discharged. Through the setting of the fourth valve 441 and the fifth valve 451, different oil supply modes can be combined and the return oil can be selected to flow back to the first oil tank 31 or the second oil tank 51 according to actual needs, so as to adapt to different return oil requirements.

[0045] For example, in the energy storage phase of a compressed gas energy storage system, the oil return mode can be a first, second, or third oil return mode. In the first oil return mode, the fourth valve 441 is closed and the fifth valve 451 is open, with the return oil flowing only back to the second oil tank 51. In the second oil return mode, the fourth valve 441 is open and the fifth valve 451 is closed, with the return oil flowing only back to the first oil tank 31. In the third oil return mode, both the fourth valve 441 and the fifth valve 451 are open, allowing the return oil to flow back to both the first and second oil tanks 31 and 51 simultaneously. The choice between the first, second, and third oil return modes can be made based on the oil supply mode and actual operating conditions. For example, during normal operation, the energy storage phase uses the first oil supply mode, where the second oil supply device 50 supplies oil to the hydraulic actuator 20. If the second oil supply device 50 ensures normal operation, the first oil return mode can be selected, with the return oil flowing back to the second oil tank 51, maintaining the circulating flow of the fire-resistant oil. When the second oil supply device 50 malfunctions, for example, the second oil pump assembly 52 fails while the second oil tank 51 functions normally, the first return oil mode can be maintained for a period of time to ensure that the liquid level in the second oil tank 51 remains essentially at its original level. Alternatively, after the second oil supply device 50 malfunctions and the oil supply mode switches to the second oil supply mode, continuing to use the first return oil mode would cause the liquid level in the second oil tank 51 to increase. If the liquid level in the second oil tank 51 exceeds a preset value, the return oil mode needs to be switched to the second return oil mode to ensure that the capacity of the second oil tank 51 is not exceeded. Or, during the energy storage phase, if the oil supply mode alternates between the first and second oil supply modes, the return oil mode can also alternate between the first and second return oil modes or use a third return oil mode. Therefore, the three return oil modes provided in this embodiment make the operation of the guide vane adjustment system 100 more flexible and can meet the needs of various operating conditions.

[0046] In some embodiments, refer to Figure 3 The first fuel supply device 30 also includes a regeneration device 32. The inlet and outlet of the regeneration device 32 are connected to the first fuel tank 31, respectively. The regeneration device 32 is used to regenerate and return the fire-resistant oil in the first fuel tank 31 to the first fuel tank 31. The regeneration device 32 is composed, for example, of regenerating resin and a precision filter. Impurities and moisture in the fire-resistant oil can be removed through the filter element, resin, or adsorbent to maintain the fire-resistant oil at a neutral state. The regeneration device 32 can periodically regenerate and purify the fire-resistant oil stored in the first fuel tank 31 to prevent oil quality deterioration.

[0047] In some embodiments, the guide vane adjustment system 100 includes a fire-resistant oil regeneration mode. In the fire-resistant oil regeneration mode, during the energy storage phase of the compressed gas energy storage system, the second oil supply device 50 supplies fire-resistant oil to the hydraulic actuator 20 via the third pressure oil supply line 43. At least a portion of the return oil from the hydraulic actuator 20 flows back to the first oil tank 31 via the first unpressurized return oil line 44, mixing with the fire-resistant oil originally stored in the first oil tank 31. The regeneration device regenerates the fire-resistant oil in the first oil tank 31, so that the fire-resistant oil transferred from the second oil tank 51 is also regenerated and purified along with the fire-resistant oil originally stored in the first oil tank 31. After all the fire-resistant oil in the second oil tank 51 has been transferred to the first oil tank 31 for regeneration (or when the fire-resistant oil level in the first oil tank 31 is high), if the energy storage phase has not yet ended, the first oil supply device 30 can be switched to continue supplying oil to the hydraulic actuator 20 during this energy storage phase. Alternatively, after all the fire-resistant oil in the second oil tank 51 has been transferred to the first oil tank 31 for regeneration (or when the fire-resistant oil level in the first oil tank 31 is high), the current energy storage phase ends. Then, at the start of the next energy storage phase, the first oil supply device 30 switches to supply oil to the hydraulic actuator 20. After switching to the first oil supply device 30 during the regeneration process, at least a portion of the return oil from the hydraulic actuator 20 flows back to the second oil tank 51 via the second unpressurized return oil pipeline 45, allowing the second oil tank 51 to receive the regenerated fire-resistant oil, thus purifying the fire-resistant oil in the second oil tank 51.

[0048] During the regeneration process described above, when the first fuel supply device 30 is in the activated state, the second valve 421 and the fifth valve 451 are in the open state, and the fourth valve 441 can be either in the open or closed state. When the second fuel supply device 50 is in the activated state, the third valve 431 and the fourth valve 441 are in the open state, and the fifth valve 451 can be either in the open or closed state. That is, in the fire-resistant oil regeneration mode, when the fuel supply mode is the first fuel supply mode, the return fuel mode is either the first return fuel mode or the third return fuel mode; when the fuel supply mode is the second fuel supply mode, the return fuel mode is either the second return fuel mode or the third return fuel mode.

[0049] For example, when the quality of the fire-resistant oil in the second oil tank 51 deteriorates after a period of operation, a first oil supply mode and a second oil return mode can be adopted. This allows the fire-resistant oil to be supplied to the hydraulic actuator 20 via the second oil pump assembly 52 and the third pressure oil supply line 43. The return oil flowing out of the hydraulic actuator 20 flows back to the first oil tank 31 via the first unpressurized return oil line 44 and mixes with the fire-resistant oil originally stored in the first oil tank 31. The fire-resistant oil stored in the first oil tank 31 can be regenerated and purified by the regeneration device 32 to maintain a good oil quality. Therefore, the second oil supply mode and the first oil return mode can be adopted. The fire-resistant oil that has been regenerated and purified in the first oil tank 31 is supplied to the hydraulic actuator 20 via the second pressure oil supply line 42. The return oil flowing out of the hydraulic actuator 20 flows back to the second oil tank 51 via the second unpressurized return oil line 45 and mixes with the fire-resistant oil originally stored in the second oil tank 51. By repeatedly cycling the above steps of mixing → purifying → remixing, the fire-resistant oil in the second oil tank 51 can be purified simultaneously, provided that only the first oil supply device 30 is equipped with a regeneration device 32. There is no need to add a regeneration device 32 to the second oil supply device 50. This can reduce equipment investment costs while ensuring the quality of the fire-resistant oil, extend the working time of the filter element in the second oil supply device 50, and eliminate the need to export the fire-resistant oil in the second oil tank 51 to the outside of the guide vane adjustment system 100, thereby reducing maintenance difficulty and maintenance costs.

[0050] When the second oil supply device 50 is also connected to the air intake regulating mechanism 5011 of the expander through the fourth pressure oil supply pipeline as described in the previous embodiment, the fire-resistant oil in the second oil tank 51 can also be regenerated and purified during the energy release stage while supplying oil to the air intake regulating mechanism 5011 of the expander. The principle of regenerating and purifying the fire-resistant oil in the second oil tank 51 during the energy release stage can refer to the principle of "mixing → purifying → remixing" during the energy storage stage.

[0051] Alternatively, as in the aforementioned embodiment, when the second oil supply device 50 is also connected to the expander's air intake regulating mechanism 5011 via a fourth pressure oil supply pipeline, the inlet and outlet of the regeneration device 32 can be connected to the second oil tank 51 respectively. This allows for the regeneration and purification of the fire-resistant oil in the first oil tank 31 during the energy release phase. The principle is similar to the "mixing → purification → remixing" principle used when the regeneration device 32 is connected to the first oil tank 31 during the energy storage phase for purifying the fire-resistant oil in the second oil tank 51, and will not be elaborated further here. Of course, in this case, the regeneration device 32 can perform online regeneration and purification of the fire-resistant oil in the second oil tank 51. Therefore, the fire-resistant oil in the second oil tank 51 can be regenerated in both the energy storage and energy release phases.

[0052] In another embodiment, the guide vane adjustment system 100 includes a regeneration device 32. The inlet of the regeneration device 32 is connected to a first oil tank 31 and a second oil tank 51, respectively, and the outlet of the regeneration device 32 is also connected to the first oil tank 31 and the second oil tank 51, respectively. The regeneration device 32 is used to regenerate and return the fire-resistant oil in the first oil tank 31 to the first oil tank 31, and / or to regenerate and return the fire-resistant oil in the second oil tank 51 to the second oil tank 51. For example, during the energy storage phase, when the fire-resistant oil in the second oil tank 51 deteriorates in quality after running for a period of time, the oil supply mode can be switched to a second oil supply mode, stopping the oil supply from the second oil tank 51 to the hydraulic actuator 20, and supplying oil to the hydraulic actuator 20 through the first oil tank 31. During the oil supply to the first oil tank 31, a second return oil mode is adopted, and the return oil flows back to the first oil tank 31 through the first unpressurized return oil pipeline 44. During the oil supply period from the first oil tank 31, the inlet and outlet of the regeneration device 32 are connected to the second oil tank 51, respectively, so that the regeneration device 32 purifies the fire-resistant oil in the second oil tank 51. After the fire-resistant oil in the second oil tank 51 is purified, the oil supply mode can be switched back to the first oil supply mode, and the second oil tank 51 supplies oil to the hydraulic actuator 20. The return oil mode can adopt the first return oil mode, and the return oil flows back to the second oil tank 51 through the second unpressurized return oil pipeline 45. During the energy storage stage, when the oil quality in the first oil tank 31 deteriorates, the oil supply mode can also be switched from the second oil supply mode to the first oil supply mode, stopping the oil supply from the first oil tank 31 to the hydraulic actuator 20, and supplying oil to the hydraulic actuator 20 through the second oil tank 51. During the oil supply period from the second oil tank 51, the first return oil mode is adopted, and the return oil flows back to the second oil tank 51 through the second unpressurized return oil pipeline 45. Furthermore, during the oil supply period from the second oil tank 51, the inlet and outlet of the regeneration device 32 are connected to the first oil tank 31, respectively, allowing the regeneration device 32 to purify the fire-resistant oil in the first oil tank 31. Thus, during the energy storage phase, while the fire-resistant oil in the second oil tank 51 is being purified, fire-resistant oil can be supplied through the first oil tank 31. This ensures the quality of the fire-resistant oil and guarantees normal oil supply to the hydraulic actuator 20 during the energy storage phase, thus ensuring the stable operation of the guide vane adjustment system 100.

[0053] During the energy release phase, if the fire-resistant oil in the first oil tank 31 needs to be purified, the inlet and outlet of the regeneration device 32 can be connected to the first oil tank 31. The first oil tank 31 can supply fire-resistant oil to the air intake regulating mechanism 5011 of the expander simultaneously, which can also ensure the quality of the fire-resistant oil and ensure normal oil supply during the energy release phase.

[0054] In some embodiments, the guide vane adjustment system 100 further includes an operating parameter detection component connected to the second oil supply device 50. The operating parameter detection component is used to detect the operating parameters of the second oil supply device 50, so as to control the state switching of the first oil supply device 30, the second oil supply device 50, the first valve 411, the second valve 421 and the third valve 431 according to the detection result of the operating parameter detection component.

[0055] The operating parameter detection component includes, for example, a second oil supply pressure detection device 54, which is installed on the third pressure oil supply pipeline 43. It is used to detect the oil supply pressure of the second oil supply device 50 during operation. For example, if the oil supply pressure of the second oil supply device 50 is detected to be lower than the preset pressure range, it may be due to a fault in the second oil pump assembly 52 or a leak in the second oil supply device 50. In this case, the second oil supply device 50 needs to be repaired.

[0056] The operating parameter detection component also includes, for example, a temperature detection device, which includes, for example, a temperature sensor, installed inside the second fuel tank 51 to detect the temperature of the fire-resistant oil inside the second fuel tank 51. When the temperature of the fire-resistant oil inside the second fuel tank 51 is detected to be higher than a preset temperature range, it may indicate a malfunction in the second circulation pump 56 or the second cooler 58, or a malfunction in the heating device inside the second fuel tank 51, and the second fuel supply device 50 also needs to be inspected.

[0057] The operating parameter detection component also includes, for example, a second liquid level detection device 59, which is mounted on the second fuel tank 51. The second liquid level detection device 59 includes, for example, a liquid level sensor for detecting the level of fire-resistant oil in the second fuel tank 51. When the second liquid level detection device 59 detects that the liquid level in the second fuel tank 51 is lower than a preset low level, it indicates a possible leak in the second fuel supply device 50, requiring maintenance of the second fuel supply device 50.

[0058] The operating parameter detection component may also include a timing device, for example, for detecting the total usage time of the second oil supply device 50. For example, when the total usage time reaches a preset time threshold, the oil quality in the second oil tank 51 deteriorates and needs to be purified, or the filter element in the second oil supply device 50 needs to be replaced.

[0059] Therefore, when the detection results of the operating parameter detection component indicate that the second oil supply device 50 is faulty and requires maintenance such as repair, purification of fire-resistant oil, or replacement of filter element, the operator or the circuit can automatically control the second oil supply device 50 to stop, close the first valve 411 and the third valve 431, open the second valve 421, and start the first oil supply device 30 to supply oil, maintaining the oil supply to the oil-driven actuator 20 during the energy storage stage, and maintaining the opening control of the inlet guide vane 10. This avoids the problem of the compressor being unusable due to the fault of the second oil supply device 50, which would necessitate stopping the energy storage stage, thus ensuring the normal operation of the energy storage stage.

[0060] In some embodiments, the guide vane adjustment system 100 further includes a control component, which is a controller that controls the devices in the guide vane adjustment system 100, including but not limited to a central processing unit, a readable storage medium, a controller, a PLC control unit, etc. The control component is electrically connected, for example, to the electro-hydraulic servo module 22 and displacement sensor 23 in the hydraulic actuator 20, to the first oil pump assembly 33, the first oil supply pressure detection device 36, the first circulation pump 37, and the first liquid level detection device 39 in the first oil supply device 30, to the second oil pump assembly 52, the second oil supply pressure detection device 54, the second circulation pump 56, and the second liquid level detection device 59 in the second oil supply device 50, and to the first valve 411, the second valve 421, the third valve 431, the fourth valve 441, and the fifth valve 451, etc. The control component can receive signals from the displacement sensor 23, the first oil supply pressure detection device 36, the first liquid level detection device 39, the second oil supply pressure detection device 54, the second liquid level detection device 59, etc., and issue control commands to the corresponding equipment according to these signals to adjust various operating modes.

[0061] The following describes the operating principle and process of some embodiments of the guide vane adjustment system 100.

[0062] [First Embodiment]

[0063] Reference Figure 1The guide vane adjustment system 100 shown, during the energy storage stage, before the compressor starts, the first oil supply device 30 is activated, the first valve 411 is closed, and the second valve 421 is opened. Fire-resistant oil is drawn into the first oil tank 31 by the first oil pump assembly 33. The outlet pressure of the first oil pump assembly 33 is established between 14.5±0.5MPa. The fire-resistant oil output by the first oil pump assembly 33 flows into the first energy storage device 35 and is delivered to the hydraulic actuator 20 via the second pressure oil supply line 42. The electro-hydraulic servo module 22 in the hydraulic actuator 20 receives the signal from the control component. After the electrical signal is processed, it is amplified by the servo amplifier and converted into a hydraulic signal in the electro-hydraulic servo module 22. The slide valve in the electro-hydraulic servo module 22 moves and amplifies the hydraulic signal to control the channel of the fire-resistant oil, adjusting the compressor inlet guide vane 10 to the specified opening degree (e.g., 65°). At this time, the guide vane adjustment system 100 is in place, and the compressor can be started to the rated speed. During compressor loading, the inlet guide vane 10 is gradually opened, and fire-resistant oil is introduced into one working chamber of the hydraulic actuator 21 via the electro-hydraulic servo module 22. Oil pressure overcomes resistance, increasing the opening of the inlet guide vane 10. The displacement sensor 23 feeds back the stroke signal to the control component, increasing the compressor's intake volume. When the opening of the inlet guide vane 10 reaches the target opening, the control component calculates the command and the stroke signal from the displacement sensor 23, causing the electro-hydraulic servo module 22 to return to its electrical zero position, blocking the oil inlet or outlet, and stopping the hydraulic actuator 21 at the designated position. During compressor unloading, the inlet guide vane 10 is gradually closed. The electro-hydraulic servo module 22 connects the hydraulic actuator 21's working chamber for oil discharge and introduces oil from the other working chamber, causing the inlet guide vane 10 to gradually close. The displacement sensor 23 feeds back the stroke signal to the control component, reducing the compressor's intake volume. During the energy release phase, the first valve 411 opens and the second valve 421 closes. The first oil supply device 30 supplies fire-resistant oil to the expander's air intake regulating mechanism 5011 through the first pressure oil supply line 41. During the operation of the first oil supply device 30, multiple first high-pressure oil pumps 331 in the first oil pump assembly 33 can be used alternately to ensure normal oil supply and improve stability. During the operation of the first oil supply device 30, the regeneration device 32 can be periodically activated to regenerate and purify the fire-resistant oil, ensuring oil quality.

[0064] [Second Embodiment]

[0065] In such Figure 3 In the guide vane adjustment system 100 shown, the principle by which fire-resistant oil enters or exits the hydraulic actuator 20 to adjust the opening of the inlet guide vane 10 is the same as that in the first embodiment described above. The difference is that, as in... Figure 3 The guide vane adjustment system 100 shown can be either a first oil supply device 30 or a second oil supply device 50, which supplies fire-resistant oil to the hydraulic actuator 20 and receives the return oil discharged from the hydraulic actuator 20.

[0066] For example, during the energy storage phase, the guide vane adjustment system 100 has a first operating mode. In this mode, the first valve 411, the second valve 421, and the fourth valve 441 are closed, while the third valve 431 and the fifth valve 451 are open. The first oil supply device 30 is in a stopped state, the second oil supply device 50 supplies oil, and the second oil pump assembly 52 inputs fire-resistant oil from the second oil tank 51 to the hydraulic actuator 20 via the third pressure oil supply line 43. The return oil discharged from the hydraulic actuator 20 flows back to the second oil tank 51 via the second unpressurized return oil line 45.

[0067] When a device in the second oil supply device 50 malfunctions, the operating mode can be switched to the second operating mode by the operator, or the aforementioned control component can control the switching to the second operating mode. Examples of malfunctions in the second oil supply device 50 include: severe leakage in the second oil tank 51 (which can be determined by the reading of the second liquid level detection device 59); malfunction of the electric heating device causing the oil temperature to be too high or too low, deviating significantly from the normal operating temperature (which can be determined by the reading of the temperature detection device); deterioration of the quality of the fire-resistant oil in the second oil tank 51 (which can be determined by the reading of the timing device or by the operator's observation); malfunction of the second circulation pump 56 preventing it from starting, resulting in the heat generated during operation not being dissipated for cooling, thus affecting the abnormal oil supply parameters (which can be determined by the reading of the temperature detection device or the second oil supply pressure detection device 54); malfunction of the second overflow valve 53 (which can be determined by the reading of the second oil supply pressure detection device 54); malfunction of the second liquid level detection device 59; and malfunction of the second oil pump assembly 52.

[0068] In the second operating mode, the first oil supply device 30 is activated, the first valve 411 and the third valve 431 are closed, and the second valve 421 and the fourth valve 441 are opened. The first oil supply device 30, through the first oil pump assembly 33, supplies the flame-retardant oil from the first oil tank 31 to the hydraulic actuator 20 via the second pressure oil supply pipeline 42. The first oil supply pressure detection device 36 detects the oil supply pressure and feeds it back to the control assembly. The return oil discharged from the hydraulic actuator 20 flows back to the first oil tank 31 via the first unpressurized return oil pipeline 44.

[0069] When the first oil supply device 30 malfunctions, only the faulty equipment and pipelines within the first oil supply device 30 can be shut down for repair and maintenance, while unaffected equipment can continue to operate. For example, in cases of malfunctions that do not affect the second oil tank 51, in the second operating mode, the fifth valve 451 is kept open initially, and the return oil discharged from the hydraulic actuator 20 can first flow back to the second oil tank 51 via the second unpressurized return oil pipeline 45. When the liquid level in the second oil tank 51 gradually rises, and the second liquid level detection device 59 detects that the liquid level has reached the preset high liquid level value, the fifth valve 451 is closed and the fourth valve 441 is opened, allowing the return oil to flow back to the first oil tank 31.

[0070] After running in the first operating mode for a period of time, the system can switch to the fire-resistant oil regeneration mode to regenerate and purify the fire-resistant oil in the second oil tank 51. When switching to the fire-resistant oil regeneration mode, the fourth valve 441 is opened (at this time, the fifth valve 451 can remain open or closed) so that the return oil flows back to the first oil tank 31 through the first unpressurized return oil pipeline 44 and mixes with the fire-resistant oil originally stored in the first oil tank 31. After entering the fire-resistant oil regeneration mode for a period of time, the second oil pump assembly 52 and the third valve 431 are closed, and the first oil pump assembly 33, the second valve 421, and the fifth valve 451 are opened (at this time, the fourth valve 441 remains open until the first liquid level detection device 39 detects that the liquid level in the first oil tank 31 has reached the preset high level and then closes), so that the return oil can flow back to the second oil tank 51 through the second unpressurized return oil pipeline 45 and mix with the fire-resistant oil in the second oil tank 51. The fire-resistant oil stored in the first oil tank 31 can be regenerated by the regeneration device 32. Therefore, through the above process, the fire-resistant oil in the first oil tank 31 and the fire-resistant oil in the second oil tank 51 can be mixed with each other. Thus, the fire-resistant oil in the second oil tank 51 can also be regenerated and purified by the regeneration device 32 without the need for additional export treatment, reducing maintenance difficulty.

[0071] Based on the above embodiments, this invention also provides a method for adjusting the opening of the inlet guide vane of the compressor in a compressed gas energy storage system. This method can be based on the guide vane adjustment system 100 in the foregoing embodiments. The specific principle and steps of this adjustment method can be referred to the principle description of the guide vane adjustment system 100 described above, and will not be repeated here.

[0072] Reference Figure 7One embodiment of the present invention also provides a compressed gas energy storage system, comprising: a gas storage tank 200, an energy storage component 300, an energy storage container 400, and an energy release component 500 connected in a closed loop in sequence. The energy storage component 300 includes a compressor 301, and the energy release component 500 includes an expander 501. The compressed gas energy storage system also includes the guide vane adjustment system 100 described in any of the preceding embodiments, wherein the inlet guide vane 10 in the guide vane adjustment system 100 is the inlet guide vane of the compressor 301, and the expander intake volume adjustment mechanism is the intake adjustment mechanism of the expander 501. The compressed gas energy storage system is specifically a carbon dioxide gas-liquid phase change energy storage system, for example. The specific structures of the gas storage tank 200, energy storage component 300, energy storage container 400, and energy release component 500 can be understood by referring to the gas storage tank, energy storage component, energy release component, and liquid storage tank disclosed in Chinese Invention Patent Publications CN112985143B, CN112985144B, CN112985145B, and CN114109549B. The compressed gas energy storage system provided in this embodiment of the invention uses a guide vane adjustment system 100 to precisely and stably adjust the opening degree of the inlet guide vane 10 of the compressor 301, preventing vibration of the inlet guide vane 10 and ensuring the normal operating conditions of the compressor 301, thereby guaranteeing energy storage efficiency.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A guide vane adjustment system for a compressor in a compressed gas energy storage system, characterized in that, include: A hydraulic actuator is connected to the inlet guide vanes of the compressor; The hydraulic actuator is used to drive the inlet guide vane to adjust to the target opening by using fire-resistant oil action; A first oil supply device is used to store and supply the fire-resistant oil; The first pressure oil supply line has a first input end and a first output end. The first input end is connected to the first oil supply device, and the first output end is connected to the air intake regulating mechanism of the expander of the compressed gas energy storage system. The second pressure oil supply line has a second input end and a second output end. The second input end is connected to the first oil supply device, and the second output end is connected to the oil actuator. The first oil supply device is used to supply the fire-resistant oil to the air intake regulating mechanism of the expander through the first pressure oil supply line, and to supply the fire-resistant oil to the hydraulic actuator through the second pressure oil supply line.

2. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 1, characterized in that, The first oil supply device includes a first oil tank for storing the fire-resistant oil, and the guide vane adjustment system further includes: A second oil supply device is used to store and supply the fire-resistant oil; the second oil supply device has a second oil tank, the storage space of which is independent of that of the first oil tank; The third pressure oil supply line has a third input end and a third output end. The third input end is connected to the second oil supply device, and the third output end is connected to the oil actuator. The second oil supply device is used to supply the fire-resistant oil to the hydraulic actuator through the third pressure oil supply line.

3. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 2, characterized in that, A first valve is provided on the first pressure oil supply line, a second valve is provided on the second pressure oil supply line, and a third valve is provided on the third pressure oil supply line; the guide vane adjustment system switches the oil supply mode by switching the first valve, the second valve, and the third valve between the open and closed states respectively.

4. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 3, characterized in that, During the energy storage phase of the compressed gas energy storage system, the oil supply mode is either the first oil supply mode or the second oil supply mode. In the first oil supply mode, the first valve and the second valve are in the closed state, the third valve is in the open state, and the second oil supply device supplies the fire-resistant oil to the hydraulic actuator through the third pressure oil supply pipeline; In the second oil supply mode, the first valve and the third valve are in the closed state, the second valve is in the open state, and the first oil supply device supplies the fire-resistant oil to the hydraulic actuator through the second pressure oil supply pipeline; And / or, during the energy release phase of the compressed gas energy storage system, the oil supply mode is the third oil supply mode, the first valve is in the open state, the second valve and the third valve are in the closed state, and the first oil supply device supplies the fire-resistant oil to the air intake regulating mechanism of the expander through the first pressure oil supply pipeline.

5. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 3, characterized in that, The guide vane adjustment system further includes a first unpressurized return oil line and a second unpressurized return oil line. The first unpressurized return oil line is connected between the hydraulic actuator and the first oil tank, and the second unpressurized return oil line is connected between the hydraulic actuator and the second oil tank. A fourth valve is provided on the first unpressurized return oil line, and a fifth valve is provided on the second unpressurized return oil line. The return oil mode is switched by switching between an open state and a closed state through the fourth valve and the fifth valve, respectively.

6. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 5, characterized in that, During the energy storage phase of the compressed gas energy storage system, the oil return mode is a first oil return mode, a second oil return mode, or a third oil return mode; in the first oil return mode, the fourth valve is in a closed state and the fifth valve is in an open state; in the second oil return mode, the fourth valve is in a closed state and the fifth valve is in a closed state; in the third oil return mode, both the fourth valve and the fifth valve are in an open state.

7. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 5, characterized in that, The first oil supply device also includes a regeneration device. The inlet and outlet of the regeneration device are respectively connected to the first oil tank. The regeneration device is used to regenerate the fire-resistant oil in the first oil tank and then return it to the first oil tank.

8. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 7, characterized in that, The guide vane adjustment system includes a fire-resistant oil regeneration mode. In the fire-resistant oil regeneration mode, during the energy storage phase of the compressed gas energy storage system, the second oil supply device supplies the fire-resistant oil to the hydraulic actuator via the third pressure oil supply line. At least part of the return oil from the hydraulic actuator flows back to the first oil tank via the first unpressurized return oil line and mixes with the fire-resistant oil originally stored in the first oil tank. The regeneration device regenerates the fire-resistant oil in the first oil tank.

9. The guide vane adjustment system of the compressor in the compressed gas energy storage system as described in claim 3, characterized in that, It also includes an operating parameter detection component, which is connected to the second oil supply device. The operating parameter detection component is used to detect the operating parameters of the second oil supply device, so as to control the state switching of the first valve, the second valve and the third valve according to the detection result of the operating parameter detection component.

10. A compressed gas energy storage system, characterized in that, include: The system comprises a gas storage tank, an energy storage component, an energy storage container, and an energy release component connected in a closed loop in sequence; the energy storage component includes a compressor, and the energy release component includes an expander; the compressed gas energy storage system further includes a guide vane adjustment system as described in any one of claims 1 to 9.

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