A method for purging pipelines of a large-scale compressed air energy storage power station

Abstract

The present application relates to the technical field of compressed air energy storage power station, and discloses a pipeline purging arrangement method of large compressed air energy storage power station, which comprises the following steps: removing throttle orifice plate, nozzle, valve core and filter screen, and isolating and protecting meter and sensor; taking one-stage compressor as gas source to purge one-stage compressor outlet pipeline and one-stage compression side vent pipeline; purging two-stage compressor outlet pipeline, two-stage and three-stage anti-surge pipeline and three-stage vent pipeline; purging three-stage compressor outlet pipeline and two-stage vent pipeline; taking one-stage and two-stage compressor as gas source to purge three-stage compressor rear pipeline, injection and production mother pipe, high-pressure cylinder inlet pipeline and medium-pressure heat exchanger inlet front pipeline; purging high-pressure and medium-pressure cylinder inlet pipeline and low-pressure cylinder inlet heat exchanger pipeline; and purging high-pressure, medium-pressure and low-pressure cylinder inlet pipeline and exhaust pipeline. The present application adopts a purging method of full process and multiple stages on compression side and expansion side, solves the disadvantages of segmented purging arrangement method, and avoids the instability caused by adding bypass gas inlet channel.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage power station technology, and in particular to a pipeline purging arrangement method for a large-scale compressed air energy storage power station. Background Technology

[0002] Clean renewable energy sources, such as wind and solar power, are affected by climate change, resource uncertainty, and the operating characteristics of power generation equipment, resulting in intermittent, volatile, and poor power quality in their power output, and making it impossible to achieve stable 24-hour power supply. With the continuous increase in the installed capacity of renewable energy in the power grid, providing users with safe, high-quality, and stable electricity has become a major challenge for grid dispatching.

[0003] Power storage technology can effectively address the aforementioned challenges, playing a crucial role in grid load regulation, balancing fluctuations in renewable and clean energy sources, and providing emergency power support. Power storage technologies are mainly divided into electrochemical energy storage and physical energy storage, among which compressed air energy storage is a key direction for large-scale clean physical energy storage. When renewable energy generates surplus electricity or during periods of low electricity demand, compressed air energy storage power plants inject air into salt caverns via compressors. During peak electricity demand periods, the high-pressure air released from the salt caverns drives the rotor of an air turbine unit to rotate at high speed, thereby generating electricity.

[0004] Because large compressed air energy storage units have complex systems and long pipelines, during construction, many contaminants such as welding slag, rust, scale, and silt accumulate inside the pipelines. Although most large-sized contaminants are removed after cleaning and passivation, a small amount of particulate matter remains. During unit operation, these high-speed passing particles can damage the pipelines, compressor and turbine blades, increase unit vibration, and potentially cause damage to the main equipment. Therefore, these impurities must be thoroughly removed before unit operation to prevent equipment (air-water heat exchangers, coolers, separators, expansion-side heat exchangers) from bursting and damage to the air turbine's flow path, ensuring the unit's safety and economy, and improving air quality and pipeline cleanliness during operation.

[0005] Defects and shortcomings of existing technology:

[0006] 1. Currently, the development of compressed air energy storage power stations is still in its early stages. The existing ones are all small-capacity compressed air energy storage power stations with relatively simple pipelines, and their pipeline purging process is relatively simple. However, for the pipeline purging and commissioning of a 300MW large-scale non-combustion compressed air energy storage power station, the current pipeline purging method is obviously not suitable for this type of large pipeline system. Therefore, it is particularly important to design a new pipeline purging and commissioning method for large-scale non-combustion compressed air energy storage power stations.

[0007] 2. Currently, most small compressed air energy storage power stations adopt a segmented purging method, where the system is disassembled before purging. This purging method greatly increases the workload, and the frequent isolation of pipelines and the addition of air-filling side doors can also cause some damage to the integrity and stability of the entire system, requiring further optimization. Summary of the Invention

[0008] This invention provides a pipeline purging arrangement method for large-scale compressed air energy storage power stations, which can solve the problems in the current pipeline purging process of large-scale non-combustion compressed air energy storage power stations. It adopts a full-process, multi-stage purging method on both the compression and expansion sides, which solves the drawbacks of the segmented purging arrangement method, simplifies the steps required for the purging process, uses the same gas source for purging operations, reduces costs, and avoids the instability caused by adding a bypass air intake channel.

[0009] This invention provides a pipeline purging arrangement method for a large-scale compressed air energy storage power station, which involves purging the inlet pipeline of the three-stage compressor on the compression side, the anti-surge pipeline, the vent valve, the injection and production header, and the inlet pipelines of the high, medium, and low-pressure cylinders on the expansion side. Specifically, it includes:

[0010] S1. Remove the components such as the orifice plate, nozzle, valve core, and filter screen, and isolate or protect the meters and sensors in the pipeline;

[0011] S2. Using a compressor as the air source, purge a compressor outlet pipe and a compressor-side vent pipe.

[0012] S3. Using the first-stage compressor as the air source, purge the outlet pipe of the second-stage compressor, the second and third-stage anti-surge pipes, and the third-stage vent pipe;

[0013] S4. Using the first-stage compressor as the air source, purge the outlet pipe of the third-stage compressor and the second-stage vent pipe.

[0014] S5. Using the first and second stage compressors as the air source, purge the pipeline after the third stage compressor, the injection and extraction main pipe, the high-pressure cylinder inlet pipeline and the pipeline before the inlet of the medium-pressure heat exchanger.

[0015] S6. Using the first and second stage compressors as the air source, purge the inlet pipelines of the high and medium pressure cylinders and the inlet heat exchanger pipelines of the low pressure cylinder.

[0016] S7. Using the first and second stage compressors as the air source, purge the inlet pipelines and exhaust pipelines of the high, medium and low pressure cylinders.

[0017] Further, step S2 specifically includes:

[0018] S201. Air enters the compressor through the air filter to purge the pipeline. After entering the compressor outlet pipeline, a portion of the air passes through a vent pipeline, a vent header, and a vent silencer before being discharged into the air.

[0019] S202. Air enters the compressor through the air filter to purge the pipeline. After entering the compressor outlet pipeline, another part passes through the temporary pipeline before the gas-water heat exchanger and the temporary silencer tower before being discharged into the air.

[0020] Furthermore, step S3 specifically includes:

[0021] S301. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the outlet pipeline of the first-stage compressor, part of it passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator to enter the intake pipeline of the second-stage compressor. After passing through the second-stage temporary pipeline and the second-stage compressor outlet pipeline, it passes through the temporary pipeline before the second-stage gas-water separator and the temporary silencer tower before being discharged into the air.

[0022] S302. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, another part passes through the second-stage anti-surge pipeline, the second-stage compressor outlet pipeline, the third-stage anti-surge pipeline, the third-stage compressor outlet pipeline, and then through the third-stage vent pipeline, the vent header, and the vent silencer tower before being discharged into the air.

[0023] Furthermore, step S4 specifically includes:

[0024] S401. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, a portion passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator to enter the second-stage compressor inlet pipeline. It then passes through the second-stage temporary pipeline, the second-stage compressor outlet pipeline, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. Finally, it passes through the third-stage compressor inlet pipeline, the third-stage temporary pipeline, the third-stage compressor outlet pipeline, the third-stage gas-water heat exchanger, the third-stage gas-water separator, and the vent pipeline before the injection and production header. Finally, it is discharged into the air after passing through the vent header and the vent silencer tower.

[0025] S402. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, another part passes through the second-stage anti-surge pipeline, the second-stage compressor outlet pipeline, and the second-stage venting pipeline before entering the venting header and venting silencer tower, and is then discharged into the air.

[0026] Furthermore, step S5 specifically includes:

[0027] Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. Then it passes through the intake pipeline of the third-stage compressor, the third-stage temporary pipeline, the third-stage compressor outlet pipeline, the third-stage gas-water heat exchanger, and the third-stage gas-water separator. After entering the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first enters the high-pressure main gas cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, and the pipeline before the intermediate-pressure cylinder inlet heat exchanger before entering the venting main pipeline and the venting silencer tower before being discharged into the air.

[0028] Further, step S6 specifically includes:

[0029] Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. After entering the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first enters the high-pressure main gas cold section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, the pipeline before the intermediate-pressure cylinder inlet heat exchanger, the intermediate-pressure cylinder inlet heat exchanger, the intermediate-pressure main gas hot section pipeline, the intermediate-pressure cylinder temporary pipeline, and the pipeline before the low-pressure cylinder inlet heat exchanger before entering the venting main pipeline and the venting silencer tower before being discharged into the air.

[0030] Furthermore, step S7 specifically includes:

[0031] Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. After passing through the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first passes through the high-pressure main gas cold section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, the pipeline before the medium-pressure cylinder inlet heat exchanger, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main gas hot section pipeline, the medium-pressure cylinder temporary pipeline, the pipeline before the low-pressure cylinder inlet heat exchanger, the low-pressure cylinder inlet heat exchanger, the low-pressure main gas hot section pipeline, the medium and low-pressure cylinder temporary pipeline, and the exhaust pipeline. After passing through the electric target plate detector for plate detection, it is discharged into the air through the venting silencer tower.

[0032] Furthermore, a pressure-stabilized purging method is adopted during purging. A target plate is installed at the exhaust pipe of the low-pressure cylinder, and the inlet pressure of the air turbine is selected as 0.4-1.5 MPa and the temperature as 40-180℃.

[0033] Furthermore, the check valves within the purging range are initially purged using plugs instead of plugs. After the pipelines before the check valves are purged, the check valves are replaced with straight pipes of equal diameter. After the purging is completed, the pipes are restored. The flow meters within the purging range are replaced with short pipes of equal diameter. The air compressor flow nozzles are restored after the compressor side is purged to the required standard.

[0034] The beneficial effects of this invention are as follows:

[0035] 1. Based on a 300MW compressed air energy storage power station project, this invention proposes a novel pipeline purging layout method that is integrated across the entire process and in multiple stages. This method fills a gap in domestic and international pipeline purging layout methods for large-scale non-combustion-type compressed air energy storage power stations. Compared with the previous segmented purging method, the integrated, multi-stage purging method proposed in this invention can reduce a significant amount of preliminary work. Compared with segmented purging, the purging method of this invention reduces the modification work to the main system, which is of great significance to the stable operation of the system.

[0036] 2. This invention uses a first-stage and second-stage compressor as the air source for pipeline purging. The pipeline purging operation can be flexibly adjusted according to the required pressure and temperature. Compared with the traditional method of adding multiple air sources and ventilation through side doors, it has the advantages of simple operation, flexibility and high stability. Attached Figure Description

[0037] Figure 1 This is a schematic flowchart of the pipeline purging arrangement method for the large-scale compressed gas energy storage power station of the present invention.

[0038] Figure 2 This is a schematic diagram of the specific process of step S2 in this invention.

[0039] Figure 3 This is a schematic diagram of the specific process of step S3 in this invention.

[0040] Figure 4 This is a schematic diagram of the specific process of step S4 in this invention.

[0041] Figure 5 This is a schematic diagram of the specific process of step S5 in this invention.

[0042] Figure 6 This is a schematic diagram of the specific process of step S6 in this invention.

[0043] Figure 7 This is a schematic diagram of the specific process of step S7 in this invention.

[0044] In the attached diagram, the components are: 1. Air filter; 2. First-stage compressor; 3. First-stage vent pipe; 4. First-stage compressor outlet pipe; 51. Temporary pipe before the first-stage gas-water heat exchanger; 52. Temporary pipe before the second-stage gas-water separator; 6. Temporary silencer tower; 7. Vent header; 8. Vent silencer tower; 9. Second-stage anti-surge pipe; 10. First-stage gas-water heat exchanger; 11. First-stage gas-water separator; 12. Second-stage compressor inlet pipe; 13. Second-stage temporary pipe; 14. Second-stage compressor outlet pipe; 15. Second-stage compressor; 16. Third-stage anti-surge pipe; 17. Third-stage compressor outlet pipe; 18. Third-stage vent pipe; 19. Second-stage vent pipe; 20. Second-stage gas-water heat exchanger; 21. Second-stage gas-water separator. 22. Three-stage compressor intake pipe; 23. Three-stage temporary pipe; 25. Three-stage gas-water heat exchanger; 26. Three-stage gas-water separator; 27. Vent pipe before injection and production main pipe; 28. Salt cavern injection and production main pipe; 29. ​​High-pressure main gas cold section pipe; 30. High-pressure cylinder inlet heat exchanger; 31. High-pressure main gas hot section pipe; 32. High-pressure cylinder temporary pipe; 33. Pipe before medium-pressure cylinder inlet heat exchanger; 34. Medium-pressure main gas hot section pipe; 35. Medium-pressure cylinder temporary pipe; 36. Low-pressure cylinder inlet heat exchanger before low-pressure cylinder; 37. Low-pressure main gas hot section pipe; 38. Low-pressure cylinder inlet heat exchanger; 39. Medium and low-pressure cylinder temporary pipe; 40. Exhaust pipe; 41. Electric target plate device.

[0045] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0047] This invention proposes a novel pipeline purging arrangement method for large-scale non-combustion-type compressed air energy storage power plants. This arrangement method can solve the current problems in the pipeline purging process of large-scale non-combustion-type compressed air energy storage power plants. It adopts a full-process, multi-stage purging method on both the compression and expansion sides, which solves the drawbacks of the segmented purging arrangement method, simplifies the steps required for the purging process, uses the same gas source for purging operations, reduces costs, and avoids the instability caused by adding a bypass air intake channel.

[0048] To achieve the above objectives, the technical solution of the present invention is as follows:

[0049] A pipeline purging arrangement method for a large-scale compressed gas energy storage power station is disclosed. Before purging, components such as orifice plates, nozzles, valve cores, and filters are removed and properly stored, and reassembled after purging. Meters and sensors in the pipeline must be isolated or protected. The purging method requires purging the inlet pipeline of the three-stage compressor on the compression side, the anti-surge pipeline, the vent valve, the injection and production header, and the inlet pipelines of the high, medium, and low-pressure cylinders on the expansion side.

[0050] The specific steps are as follows:

[0051] S1. Remove the components of the orifice plate, nozzle, valve core, and filter screen, and reassemble them after purging is completed; at the same time, isolate or protect the meters and sensors in the pipeline.

[0052] S2. Using a compressor as the air source, purge a section of the compressor outlet pipe and a section of the compressor-side vent pipe. For example... Figure 2 As shown, it specifically includes:

[0053] (1) First stage compressor 2 → First stage compressor outlet pipe 4 → First stage vent pipe 3 → Vent header 7 → Vent silencer tower 8 → Vent to air; corresponding to step S201.

[0054] S201. Air enters the compressor 2 through the air filter 1 to purge the pipeline. After entering the compressor outlet pipe 4, a portion of the air passes through the vent pipe 3, the vent header pipe 7, and the vent silencer tower 8 before being discharged into the air.

[0055] (2) First stage compressor 2 → First stage compressor outlet pipe 4 → First stage gas-water heat exchanger front temporary pipe 5 (the temporary pipe is disconnected before the first stage gas-water heat exchanger 1, and the heat exchanger side is blocked) → Temporary silencer tower 6 → Vent to the air; corresponding to step S202.

[0056] S202. Air enters the compressor 2 through the air filter 1 to purge the pipeline. First, it enters the compressor outlet pipe 4, and then the other part passes through the temporary pipe 51 before the gas-water heat exchanger and the temporary silencer 6 before being discharged into the air.

[0057] S3. Using the first-stage compressor as the air source, purge the outlet pipe of the second-stage compressor, the second and third-stage anti-surge pipes, and the third-stage vent pipe. For example... Figure 3 As shown, it specifically includes:

[0058] (1) First stage compressor 2 → First stage compressor outlet pipe 4 → First stage gas-water heat exchanger 10 → First stage gas-water separator 11 → Second stage compressor inlet pipe 12 → Second stage temporary pipe 13 → Second stage compressor outlet pipe 14 → Second stage gas-water separator front temporary pipe 52 (the temporary pipe is disconnected before the second stage gas-water heat exchanger 1, and the heat exchanger side is sealed) → Temporary silencer tower 6 → Vent to the air; corresponding to step S301.

[0059] S301. Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. After entering the first-stage compressor outlet pipe 4, a portion passes through the first-stage gas-water heat exchanger 10 and the first-stage gas-water separator 11 before entering the second-stage compressor inlet pipe 12. After passing through the second-stage temporary pipe 13 and the second-stage compressor outlet pipe 14, it passes through the temporary pipe 52 before the second-stage gas-water separator and the temporary silencer tower 6 before being discharged into the air.

[0060] (2) First stage compressor 2 → First stage compressor outlet pipe 4 → Second stage anti-surge pipe 9 → Second stage compressor outlet pipe 14 → Third stage anti-surge pipe 16 → Third stage compressor outlet pipe 17 → Third stage vent pipe 18 → Vent main pipe 7 → Vent silencer tower 8 → Vent to air; corresponding to step S302.

[0061] S302. Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. First, it enters the first-stage compressor outlet pipe 4, and then another part passes through the second-stage anti-surge pipe 9, the second-stage compressor outlet pipe 14, the third-stage anti-surge pipe 16, the third-stage compressor outlet pipe 17, and then through the third-stage vent pipe 18, the vent header pipe 7, and the vent silencer tower 8 before being discharged into the air.

[0062] S4. Using the first-stage compressor as the air source, purge the outlet pipe of the third-stage compressor and the second-stage vent pipe. For example... Figure 4 As shown, it specifically includes:

[0063] (1) First stage compressor 2 → First stage compressor outlet pipe 4 → First stage gas-water heat exchanger 10 → First stage gas-water separator 11 → Second stage compressor inlet pipe 12 → Second stage temporary pipe 13 → Second stage compressor outlet pipe 14 → Second stage gas-water heat exchanger 20 → Second stage gas-water separator 21 → Third stage compressor inlet pipe 22 → Third stage temporary pipe 23 → Third stage compressor outlet pipe 17 → Third stage gas-water heat exchanger 25 → Third stage gas-water separator 26 → Vent pipe 27 before injection and production header → Vent header 7 → Vent silencer tower 8 → Vent to air; corresponding to step S401.

[0064] S401. Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. First, it enters the first-stage compressor outlet pipe 4, and then a portion passes through the first-stage gas-water heat exchanger 10 and the first-stage gas-water separator 11 to enter the second-stage compressor inlet pipe 12. It then passes through the second-stage temporary pipe 13, the second-stage compressor outlet pipe 14, the second-stage gas-water heat exchanger 20, and the second-stage gas-water separator 21. After that, it passes through the third-stage compressor inlet pipe 22, the third-stage temporary pipe 23, the third-stage compressor outlet pipe 17, the third-stage gas-water heat exchanger 25, the third-stage gas-water separator 26, and the vent pipe 27 before the injection and production main pipe. Finally, it is discharged into the air through the vent main pipe 7 and the vent silencer tower 8.

[0065] (2) First stage compressor 2 → First stage compressor outlet pipe 4 → Second stage anti-surge pipe 9 → Second stage compressor outlet pipe 14 → Second stage vent pipe 19 → Vent main pipe 7 → Vent silencer tower 8 → Vent to air; corresponding to step S402.

[0066] S402. Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. After entering the first-stage compressor outlet pipe 4, another part passes through the second-stage anti-surge pipe 9, the second-stage compressor outlet pipe 14, the second-stage vent pipe 19, and then enters the vent header pipe 7 and the vent silencer tower 8 before being discharged into the air.

[0067] S5. Using the first and second stage compressors as the air source, purge the pipelines after the third stage compressor, the injection and extraction headers, the high-pressure cylinder inlet pipeline, and the pipelines before the inlet of the medium-pressure heat exchanger. For example... Figure 5 As shown, it specifically includes:

[0068] The specific process is as follows: First-stage compressor 2 → First-stage compressor outlet pipe 4 → First-stage gas-water heat exchanger 10 → First-stage gas-water separator 11 → Second-stage compressor inlet pipe 12 → Second-stage compressor 15 → Second-stage compressor outlet pipe 14 → Second-stage gas-water heat exchanger 20 → Second-stage gas-water separator 21 → Third-stage compressor inlet pipe 22 → Third-stage temporary pipe 23 → Third-stage compressor outlet pipe 17 → Third-stage gas-water heat exchanger 25 → Third-stage gas-water separator 26 → Salt cavern injection / production header 28 → High-pressure main gas cold section pipe 29 → High-pressure cylinder inlet heat exchanger 30 → High-pressure main gas hot section pipe 31 → High-pressure cylinder temporary pipe 32 → Intermediate-pressure cylinder inlet heat exchanger front pipe 33 → Vent header 7 → Vent silencer tower 8 → Aerial discharge;

[0069] The pipeline is purged using the compressors at both ends as the air source. Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. It first enters the outlet pipe 4 of the first-stage compressor, then passes through the first-stage gas-water heat exchanger 10 and the first-stage gas-water separator 11, and then enters the inlet pipe 12 of the second-stage compressor. After leaving the second-stage compressor 15, the air first enters the outlet pipe 14 of the second-stage compressor, the second-stage gas-water heat exchanger 20, and the second-stage gas-water separator 21. Then it passes through the inlet pipe 22 of the third-stage compressor, the third-stage temporary pipe 23, the outlet pipe 17 of the third-stage compressor, the third-stage gas-water heat exchanger 25, and the third-stage gas-water separator 26. After entering the salt cavern injection and extraction main pipe 28, it enters the expansion side pipeline. It first enters the high-pressure main gas cooling section pipe 29, the high-pressure cylinder inlet heat exchanger 30, the high-pressure main gas hot section pipe 31, the high-pressure cylinder temporary pipe 32, and the pipe before the intermediate-pressure cylinder inlet heat exchanger 33. Then it enters the venting main pipe 7 and the venting silencer tower 8 before being discharged into the air.

[0070] S6. Using the first and second stage compressors as the air source, purge the inlet pipelines of the high and medium pressure cylinders and the inlet heat exchanger pipeline of the low pressure cylinder.

[0071] like Figure 6 As shown, it specifically includes:

[0072] First-stage compressor 2 → First-stage compressor outlet pipe 4 → First-stage gas-water heat exchanger 10 → First-stage gas-water separator 11 → Second-stage compressor inlet pipe 12 → Second-stage compressor 15 → Second-stage compressor outlet pipe 14 → Second-stage gas-water heat exchanger 20 → Second-stage gas-water separator 21 → Salt cavern injection and extraction header pipe 28 → High-pressure main gas cold section pipe 29 → High-pressure cylinder inlet heat exchanger 30 → High-pressure main gas hot section pipe 31 → High-pressure cylinder temporary pipe 32 → Intermediate-pressure cylinder inlet heat exchanger before pipe 33 → Intermediate-pressure cylinder inlet heat exchanger 34 → Intermediate-pressure main gas hot section pipe 35 → Intermediate-pressure cylinder temporary pipe 36 → Low-pressure cylinder inlet heat exchanger before pipe 37 → Vent header pipe 7 → Vent silencer tower 8 → Vent to air; The specific process is as follows:

[0073] Starting from step S6, the three-stage compressor pipeline is no longer purged. Instead, the salt cavern injection and extraction main pipe 28 is directly connected after the second-stage gas-water separator 21 and then enters the expansion side pipeline. That is: Air enters the first-stage compressor 2 through the air filter 1 to purge the pipeline. It first enters the outlet pipeline 4 of the first-stage compressor, then passes through the first-stage gas-water heat exchanger 10 and the first-stage gas-water separator 11, and then enters the intake pipeline 12 of the second-stage compressor. After leaving the second-stage compressor 15, the air first enters the outlet pipeline 14 of the second-stage compressor, the second-stage gas-water heat exchanger 20, and the second-stage gas-water separator 21. After passing through the salt cavern injection and extraction main pipeline 28, it enters the expansion side pipeline. It first passes through the high-pressure main gas cooling section pipeline 29, the high-pressure cylinder inlet heat exchanger 30, the high-pressure main gas hot section pipeline 31, the high-pressure cylinder temporary pipeline 32, the pipeline before the intermediate-pressure cylinder inlet heat exchanger 33, the intermediate-pressure cylinder inlet heat exchanger 34, the intermediate-pressure main gas hot section pipeline 35, the intermediate-pressure cylinder temporary pipeline 36, and the pipeline before the low-pressure cylinder inlet heat exchanger 37, and then passes through the venting main pipeline 7 and the venting silencer tower 8 before being discharged into the air.

[0074] S7. Using the first and second stage compressors as the air source, purge the inlet pipelines and exhaust pipelines of the high, medium, and low pressure cylinders. For example... Figure 7 As shown, it specifically includes:

[0075] First-stage compressor 2 → First-stage compressor outlet pipe 4 → First-stage gas-water heat exchanger 10 → First-stage gas-water separator 11 → Second-stage compressor inlet pipe 12 → Second-stage compressor 15 → Second-stage compressor outlet pipe 14 → Second-stage gas-water heat exchanger 20 → Second-stage gas-water separator 21 → Salt cavern injection and extraction header pipe 28 → High-pressure main gas cooling section pipe 29 → High-pressure cylinder inlet heat exchanger 30 → High-pressure main gas hot section pipe 31 → High-pressure cylinder temporary pipe 32 → Intermediate-pressure cylinder inlet heat exchanger before pipe 33 → Intermediate-pressure cylinder inlet heat exchanger 34 → Intermediate-pressure main gas hot section pipe 35 → Intermediate-pressure cylinder temporary pipe 36 → Low-pressure cylinder inlet heat exchanger before pipe 37 → Low-pressure cylinder inlet heat exchanger 39 → Low-pressure main gas hot section pipe 38 → Intermediate and low-pressure cylinder temporary pipe 40 → Exhaust pipe 41 → Electric target plate device 42 → Venting silencer tower 8 → Aerial discharge; The specific process is as follows:

[0076] Step S7 is performed based on S6, using the compressors at both ends as the air source to purge the pipeline. Specifically: air enters the first-stage compressor 2 through air filter 1 to purge the pipeline. It first enters the first-stage compressor outlet pipe 4, then passes through the first-stage gas-water heat exchanger 10 and the first-stage gas-water separator 11 before entering the second-stage compressor inlet pipe 12. Air then departs from the second-stage compressor 15, first entering the second-stage compressor outlet pipe 14, the second-stage gas-water heat exchanger 20, and the second-stage gas-water separator 21. After passing through the salt cavern injection and extraction header 28, it enters the expansion side pipeline, first flowing into the high-pressure main cooling section pipeline 29. The pipeline consists of: high-pressure cylinder inlet heat exchanger 30, high-pressure main gas hot section pipeline 31, high-pressure cylinder temporary pipeline 32, medium-pressure cylinder inlet heat exchanger front pipeline 33, medium-pressure cylinder inlet heat exchanger 34, medium-pressure main gas hot section pipeline 35, medium-pressure cylinder temporary pipeline 36, low-pressure cylinder inlet heat exchanger front pipeline 37, low-pressure cylinder inlet heat exchanger 39, low-pressure main gas hot section pipeline 38, medium and low-pressure cylinder temporary pipeline 40, and exhaust pipeline 41. After passing through electric target plate device 42 for plate detection, the exhaust is discharged into the air through venting silencer tower 8.

[0077] In one embodiment, when purging the entire compressed air energy storage main system, the unit adopts a pressure-stabilized purging method, a target plate is installed at the exhaust pipe of the low-pressure cylinder, and the air turbine inlet pressure is selected as 0.4 to 1.5 MPa and the temperature as 40 to 180°C. The specific purging parameters can be adjusted accordingly based on the actual purging effect.

[0078] In one embodiment, the check valve within the purging range is replaced by a plug plate during the initial purging. After the pipeline purging before the check valve is completed, the check valve is replaced with a straight pipe of equal diameter. The pipe is restored after the unit purging is completed. The orifice plate, nozzle, valve core, filter screen and other devices within the purging range should be removed. The flow meter is replaced with a short pipe of equal diameter. The air compressor flow nozzle is restored after the compressor side is purged to a qualified standard.

[0079] This invention proposes a novel pipeline purging layout method for large-scale non-combustion compressed air energy storage power plants. Based on a 300MW compressed air energy storage power plant project, this method is a full-process, multi-stage, integrated pipeline purging layout method that fills the gap in domestic and international pipeline purging layout methods for large-scale non-combustion compressed air energy storage power plants. Compared with the previous segmented purging, the full-process, multi-stage purging method proposed in this invention can reduce a lot of preliminary work. Compared with segmented purging, the purging method of this invention reduces the modification work of the main system, which is of great significance to the stable operation of the system.

[0080] The present invention proposes a novel pipeline purging arrangement method based on a large-scale non-combustion-type compressed air energy storage power station. This method uses a first-stage and second-stage compressor as the air source for pipeline purging. The pipeline purging operation can be flexibly adjusted according to the required pressure and temperature. Compared with the traditional method that requires multiple air sources and ventilation through side doors, this method has the advantages of simple operation, flexibility, and high stability.

[0081] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0082] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pipeline purging arrangement method for a large-scale compressed air energy storage power station, characterized in that, The inlet pipeline of the three-stage compressor on the compression side, the anti-surge pipeline, the vent valve, the injection and production header, and the inlet pipelines of the high, medium, and low pressure cylinders on the expansion side are purged, specifically including: S1. Remove the components such as the orifice plate, nozzle, valve core, and filter screen, and isolate or protect the meters and sensors in the pipeline; S2. Using a compressor as the air source, purge a compressor outlet pipe and a compressor-side vent pipe. S3. Using the first-stage compressor as the air source, purge the outlet pipe of the second-stage compressor, the second and third-stage anti-surge pipes, and the third-stage vent pipe; S4. Using the first-stage compressor as the air source, purge the outlet pipe of the third-stage compressor and the second-stage vent pipe. S5. Using the first and second stage compressors as the air source, purge the pipeline after the third stage compressor, the injection and extraction main pipe, the high-pressure cylinder inlet pipeline and the pipeline before the inlet of the medium-pressure heat exchanger. S6. Using the first and second stage compressors as the air source, purge the inlet pipelines of the high and medium pressure cylinders and the inlet heat exchanger pipelines of the low pressure cylinder. S7. Using the first and second stage compressors as the air source, purge the inlet pipelines and exhaust pipelines of the high, medium and low pressure cylinders.

2. The pipeline purging arrangement method for a large-scale compressed gas energy storage power station according to claim 1, characterized in that, Step S2 specifically includes: S201. Air enters the compressor through the air filter to purge the pipeline. After entering the compressor outlet pipeline, a portion of the air passes through a vent pipeline, a vent header, and a vent silencer before being discharged into the air. S202. Air enters the compressor through the air filter to purge the pipeline. After entering the compressor outlet pipeline, another part passes through the temporary pipeline before the gas-water heat exchanger and the temporary silencer tower before being discharged into the air.

3. The pipeline purging arrangement method for a large-scale compressed gas energy storage power station according to claim 1, characterized in that, Step S3 specifically includes: S301. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the outlet pipeline of the first-stage compressor, part of it passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator to enter the intake pipeline of the second-stage compressor. After passing through the second-stage temporary pipeline and the second-stage compressor outlet pipeline, it passes through the temporary pipeline before the second-stage gas-water separator and the temporary silencer tower before being discharged into the air. S302. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, another part passes through the second-stage anti-surge pipeline, the second-stage compressor outlet pipeline, the third-stage anti-surge pipeline, the third-stage compressor outlet pipeline, and then through the third-stage vent pipeline, the vent header, and the vent silencer tower before being discharged into the air.

4. The pipeline purging arrangement method for a large-scale compressed gas energy storage power station according to claim 1, characterized in that, Step S4 specifically includes: S401. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, a portion passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator to enter the second-stage compressor inlet pipeline. It then passes through the second-stage temporary pipeline, the second-stage compressor outlet pipeline, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. Finally, it passes through the third-stage compressor inlet pipeline, the third-stage temporary pipeline, the third-stage compressor outlet pipeline, the third-stage gas-water heat exchanger, the third-stage gas-water separator, and the vent pipeline before the injection and production header. Finally, it is discharged into the air after passing through the vent header and the vent silencer tower. S402. Air enters the first-stage compressor through the air filter to purge the pipeline. After entering the first-stage compressor outlet pipeline, another part passes through the second-stage anti-surge pipeline, the second-stage compressor outlet pipeline, and the second-stage venting pipeline before entering the venting header and venting silencer tower, and is then discharged into the air.

5. The pipeline purging arrangement method for a large-scale compressed air energy storage power station according to claim 1, characterized in that, Step S5 specifically includes: Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. Then it passes through the intake pipeline of the third-stage compressor, the third-stage temporary pipeline, the third-stage compressor outlet pipeline, the third-stage gas-water heat exchanger, and the third-stage gas-water separator. After entering the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first enters the high-pressure main gas cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, and the pipeline before the intermediate-pressure cylinder inlet heat exchanger before entering the venting main pipeline and the venting silencer tower before being discharged into the air.

6. The pipeline purging arrangement method for a large-scale compressed gas energy storage power station according to claim 1, characterized in that, Step S6 specifically includes: Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. After entering the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first enters the high-pressure main gas cold section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, the pipeline before the intermediate-pressure cylinder inlet heat exchanger, the intermediate-pressure cylinder inlet heat exchanger, the intermediate-pressure main gas hot section pipeline, the intermediate-pressure cylinder temporary pipeline, and the pipeline before the low-pressure cylinder inlet heat exchanger before entering the venting main pipeline and the venting silencer tower before being discharged into the air.

7. The pipeline purging arrangement method for a large-scale compressed gas energy storage power station according to claim 1, characterized in that, Step S7 specifically includes: Air enters the first-stage compressor through the air filter to purge the pipeline. It first enters the outlet pipeline of the first-stage compressor, then passes through the first-stage gas-water heat exchanger and the first-stage gas-water separator before entering the intake pipeline of the second-stage compressor. After leaving the second-stage compressor, the air first enters the outlet pipeline of the second-stage compressor, the second-stage gas-water heat exchanger, and the second-stage gas-water separator. After passing through the salt cavern injection and extraction main pipeline, it enters the expansion side pipeline. It first passes through the high-pressure main gas cold section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main gas hot section pipeline, the high-pressure cylinder temporary pipeline, the pipeline before the medium-pressure cylinder inlet heat exchanger, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main gas hot section pipeline, the medium-pressure cylinder temporary pipeline, the pipeline before the low-pressure cylinder inlet heat exchanger, the low-pressure cylinder inlet heat exchanger, the low-pressure main gas hot section pipeline, the medium and low-pressure cylinder temporary pipeline, and the exhaust pipeline. After passing through the electric target plate detector for plate detection, it is discharged into the air through the venting silencer tower.

8. The pipeline purging arrangement method for a large-scale compressed air energy storage power station according to claim 1, characterized in that, When purging, a pressure-stabilized purging method is adopted. A target plate is installed at the exhaust pipe of the low-pressure cylinder. The inlet pressure of the air turbine is selected as 0.4-1.5 MPa and the temperature is 40-180℃.

9. The pipeline purging arrangement method for a large-scale compressed air energy storage power station according to claim 1, characterized in that, For the first purging of the check valve within the purging range, a plug plate is used instead. After the pipeline before the check valve is purged, the check valve is replaced with a straight pipe of equal diameter. After the purging is completed, it is restored. The flow meter within the purging range is replaced with a short pipe of equal diameter. The air compressor flow nozzle is restored after the compressor side is purged and qualified.

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