Pipeline purging arrangement method for large compressed air energy storage power station

Abstract

The invention relates to the technical field of compressed air energy storage power stations, and discloses a pipeline purging arrangement method for a large compressed air energy storage power station, which comprises the following steps of: taking out a throttling orifice plate, a nozzle, a valve core and a filter screen, and isolating and protecting a meter and a sensor; the first-section compressor serves as an air source, and a first-section compressor outlet pipeline and a first-section compression side emptying pipeline are purged; purging a second-section compressor outlet pipeline, a second-section anti-surge pipeline, a third-section anti-surge pipeline and a third-section emptying pipeline; blowing a third-section compressor outlet pipeline and a second-section emptying pipeline; a first-section compressor and a second-section compressor serve as air sources, and a pipeline behind a third-section compressor, an injection-production mother pipe, a high-pressure cylinder inlet pipeline and a pipeline in front of an inlet of a medium-pressure heat exchanger are purged; purging high-pressure and medium-pressure cylinder inlet pipelines and a low-pressure cylinder inlet heat exchanger pipeline; and high-pressure, medium-pressure and low-pressure cylinder inlet pipelines and exhaust pipelines are purged. The full-flow and multi-stage purging method of the compression side and the expansion side is adopted, the defects of a sectional purging arrangement method are overcome, and instability caused by the fact that a bypass air inlet channel is additionally arranged is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of compressed air energy storage power stations, and in particular to a pipeline purge arrangement method for a large compressed air energy storage power station. Background Art

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

[0003] Power storage technology can effectively meet the above challenges and play an important role in load regulation of power grids, balancing fluctuations in renewable clean energy, and providing emergency power support. Power storage technology is mainly divided into electrochemical energy storage and physical energy storage, among which compressed air energy storage power generation is a key direction for large-scale clean physical energy storage. When renewable energy generates surplus electricity or during low electricity consumption periods, compressed air energy storage power stations inject air into salt caverns through compressors. During peak electricity consumption periods, the high-pressure air released from the salt caverns will drive the rotor of the air turbine unit to rotate at high speed, thereby generating electricity.

[0004] Since the system of large compressed air energy storage units is relatively complex and the pipelines are laid for a long time, during the construction stage, many pollutants such as welding slag, rust, oxide scale, and sand will be deposited inside the pipelines. Although most of the large-sized pollutants have been cleaned up after cleaning and passivation of the pipelines, a small amount of particles will still remain in the pipes. During the operation of the unit, the impurity particles passing through at high speed will damage the pipelines, the blades of the compressor and turbine, increase the vibration of the unit, and may even cause damage to the main equipment. Therefore, these debris must be blown away as much as possible before the unit is operated to prevent the equipment (air-water heat exchanger, cooler, separator, expansion side heat exchanger) from bursting during the operation of the unit and the flow part of the air turbine from being damaged, so as to ensure the safety and economy of the unit and improve the air quality and cleanliness of the pipeline during operation.

[0005] Defects and shortcomings of existing technology:

[0006] 1. We are still in the development stage of compressed air energy storage power stations. Currently, those that have been put into operation are small-capacity compressed air energy storage power stations with relatively simple pipelines. Their pipeline purge process is relatively simple. However, for the pipeline purge and commissioning of 300MW large-scale non-supplementary compressed air energy storage power stations, the current pipeline purge method is obviously not suitable for such large-scale pipeline systems. Therefore, it is particularly important to design a new pipeline purge and commissioning method for large-scale non-supplementary compressed air energy storage power stations.

[0007] 2. Currently, most small compressed air energy storage power stations use a segmented purge method to split the system and then purge it. This purge method greatly increases the workload, and frequent isolation of pipelines and additional inflation side doors will also cause a certain degree of damage to the integrity and stability of the entire system, which requires further optimization. Summary of the invention

[0008] The present invention provides a pipeline purging arrangement method for a large-scale compressed gas energy storage power station, which can solve the difficult problem of the pipeline purging process of the current large-scale non-supplementary combustion compressed gas energy storage power station, adopts a full-process, multi-stage purging method on the compression side and the expansion side, solves the disadvantages of the segmented purging arrangement method, simplifies the steps required for the purging process, adopts the same gas source for purging operations, reduces costs, and avoids the instability caused by the addition of a bypass air inlet channel.

[0009] The present invention provides a pipeline purging arrangement method for a large-scale compressed gas energy storage power station, which purges the inlet pipeline of the three-stage compressor on the compression side, the anti-surge pipeline, the vent valve, the injection and production main pipe, and the inlet pipelines of the high, medium and low pressure cylinders on the expansion side, specifically including:

[0010] S1. Take out the throttling 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 gas source, purge a compressor outlet pipe and a compression side vent pipe;

[0012] S3, using the first stage compressor as the gas 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 gas source, purge the outlet pipes of the third stage compressor and the second stage vent pipe;

[0014] S5. Use the first and second stage compressors as the gas source to purge the pipeline after the third stage compressor, the injection and production main pipe, the high-pressure cylinder inlet pipeline and the pipeline before the medium-pressure heat exchanger inlet;

[0015] S6. Use the first and second stage compressors as the gas source to purge the high and medium pressure cylinder inlet pipelines and the low pressure cylinder inlet heat exchanger pipeline;

[0016] S7. Use the first and second stage compressors as the air source to purge the high, medium and low pressure cylinder inlet pipelines and exhaust pipelines.

[0017] Furthermore, the step S2 specifically includes:

[0018] S201, air enters the compressor through the air filter to start purging the pipeline, and after entering the outlet pipeline of the compressor, part of the air passes through a venting pipeline, a venting main pipe, and a venting silencer tower, and then is discharged into the air;

[0019] S202, air enters the compressor through the air filter and starts to purge the pipeline. After entering the outlet pipe of the compressor, the other part passes through a temporary pipe in front of an air-water heat exchanger and a temporary silencer tower and is discharged into the air.

[0020] Furthermore, the step S3 specifically includes:

[0021] S301, air enters the first compressor through the air filter and starts to purge the pipeline. After entering the outlet pipeline of the first compressor, part of the air passes through the first air-water heat exchanger and the first air-water separator and enters the second compressor inlet pipeline. After passing through the second temporary pipeline and the second compressor outlet pipeline, the air passes through the temporary pipeline before the second air-water separator and the temporary silencer tower and is discharged into the air.

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

[0023] Furthermore, the step S4 specifically includes:

[0024] S401, air enters the first compressor through the air filter and starts to purge the pipeline. After entering the outlet pipeline of the first compressor, part of the air passes through the first air-water heat exchanger and the first air-water separator and enters the second compressor inlet pipeline, passes through the second temporary pipeline, the second compressor outlet pipeline, the second air-water heat exchanger, the second air-water separator, and then passes through the third compressor inlet pipeline, the third temporary pipeline, the third compressor outlet pipeline, the third air-water heat exchanger, the third air-water separator, and the venting pipeline before the injection and production main pipe, and enters the venting main pipe and the venting silencer before being discharged into the air;

[0025] S402, air enters the first compressor through the air filter and starts to purge the pipeline. After entering the first compressor outlet pipe, the other part passes through the second anti-surge pipe, the second compressor outlet pipe, the second vent pipe, and then enters the vent main pipe and the vent silencer tower and is discharged into the air.

[0026] Furthermore, the step S5 specifically includes:

[0027] The air enters the first compressor from the air filter and starts to purge the pipeline. It first enters the outlet pipeline of the first compressor and then passes through the first air-water heat exchanger and the first air-water separator to enter the air inlet pipeline of the second compressor. After leaving the second compressor, the air first enters the air outlet pipeline of the second compressor, the second air-water heat exchanger, and the second air-water separator. Then, it passes through the air inlet pipeline of the third compressor, the third temporary pipeline, the air outlet pipeline of the third compressor, the third air-water heat exchanger, and the third air-water separator. After entering the salt cavern injection and production main pipe, it enters the expansion side pipeline. First, it enters the high-pressure main air cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main air hot section pipeline, the high-pressure cylinder temporary pipeline, and the pipeline before the medium-pressure cylinder inlet heat exchanger, and then enters the venting main pipe, and the venting silencer tower is discharged into the air.

[0028] Furthermore, the step S6 specifically includes:

[0029] The air enters the first compressor from the air filter and starts to purge the pipeline. It first enters the outlet pipeline of the first compressor and then passes through a first air-water heat exchanger and a first air-water separator to enter the air inlet pipeline of the second compressor. After leaving the second compressor, the air first enters the air outlet pipeline of the second compressor, the second air-water heat exchanger, and the second air-water separator. After entering the salt cavern injection and production mother pipe, it enters the expansion side pipeline. It first enters the high-pressure main air cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main air hot section pipeline, the high-pressure cylinder temporary pipeline, the medium-pressure cylinder inlet heat exchanger front pipeline, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main air hot section pipeline, the medium-pressure cylinder temporary pipeline, the low-pressure cylinder inlet heat exchanger front pipeline, and then enters the venting mother pipe, and then discharges into the air after the venting silencer.

[0030] Furthermore, the step S7 specifically includes:

[0031] The air enters the first compressor from the air filter and starts to purge the pipeline. It first enters the outlet pipeline of the first compressor and then passes through a first air-water heat exchanger and a first air-water separator to enter the air inlet pipeline of the second compressor. After leaving the second compressor, the air first enters the air outlet pipeline of the second compressor, the second air-water heat exchanger, and the second air-water separator. After entering the salt cavern injection and production mother pipe, it enters the expansion side pipeline. It first enters the high-pressure main air cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main air hot section pipeline, the high-pressure cylinder temporary pipeline, the medium-pressure cylinder inlet heat exchanger front pipeline, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main air hot section pipeline, the medium-pressure cylinder temporary pipeline, the low-pressure cylinder inlet heat exchanger front pipeline, the low-pressure cylinder inlet heat exchanger, the low-pressure main air hot section pipeline, the medium and low-pressure cylinder temporary pipeline, and the exhaust pipeline. After the plate detection is carried out by the electric target plate device, it is discharged into the air after passing through the venting silencer tower.

[0032] Furthermore, a steady-pressure purging method is adopted during purging, a target plate is installed at the exhaust pipe of the low-pressure cylinder, and the air turbine inlet pressure is selected to be 0.4-1.5Mpa and the temperature is 40-180°C.

[0033] Furthermore, the check valve in the purge range is replaced by a blocking plate for the first purge, the pipeline before the check valve is purged, the check valve is replaced with a straight pipe of equal diameter, and restored after the purge is completed, the flow meter in the purge range is replaced with a short pipe of equal diameter, and the air compressor flow nozzle is restored after the compressor side is purged and qualified.

[0034] The beneficial effects of the present invention are:

[0035] 1. Based on the 300MW compressed air energy storage power station project, the present invention proposes a full-process, multi-stage, integrated new pipeline purge layout method, which fills the gap in the pipeline purge layout method of large-scale non-supplementary compressed air energy storage power stations at home and abroad. Compared with the previous segmented purge, the full-process, multi-stage purge method proposed by the present invention can reduce a lot of preliminary work. Compared with the segmented purge, the purge method of the present invention reduces the modification work of the main system, which is of great significance to the smooth operation of the system.

[0036] 2. The present invention adopts one or two stage compressors as air sources to carry out pipeline purging work, and can flexibly adjust the pipeline purging work according to the pressure and temperature required for purging. Compared with the traditional ventilation method that requires adding multiple air sources through side doors, it has the advantages of simple operation, flexibility and high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of the pipeline purge arrangement method of a large-scale compressed gas energy storage power station according to the present invention.

[0038] Figure 2 It is a specific flow chart of step S2 in the present invention.

[0039] Figure 3 It is a specific flow chart of step S3 in the present invention.

[0040] Figure 4 It is a specific flow chart of step S4 in the present invention.

[0041] Figure 5 It is a specific flow chart of step S5 in the present invention.

[0042] Figure 6 It is a specific flow chart of step S6 in the present invention.

[0043] Figure 7 It is a specific flow chart of step S7 in the present invention.

[0044] In the attached drawings, air filter 1, first-stage compressor 2, first-stage venting pipeline 3, first-stage compressor outlet pipeline 4, first-stage temporary pipeline 51 before air-water heat exchanger, second-stage temporary pipeline 52 before air-water separator, temporary silencer 6, venting main pipe 7, venting silencer 8, second-stage anti-surge pipeline 9, first-stage air-water heat exchanger 10, first-stage air-water separator 11, second-stage compressor air inlet pipeline 12, second-stage temporary pipeline 13, second-stage compressor outlet pipeline 14, second-stage compressor 15, third-stage anti-surge pipeline 16, third-stage compressor outlet pipeline 17, third-stage venting pipeline 18, second-stage venting pipeline 19, second-stage air-water heat exchanger 20, second-stage air-water separator 21 , three-section compressor air intake pipeline 22, three-section temporary pipeline 23, three-section air-water heat exchanger 25, three-section air-water separator 26, front vent pipeline 27 of injection and production main pipe, salt cavern injection and production main pipe 28, high-pressure main air cooling section pipeline 29, high-pressure cylinder inlet heat exchanger 30, high-pressure main air hot section pipeline 31, high-pressure cylinder temporary pipeline 32, front pipeline 33 of medium-pressure cylinder inlet heat exchanger, medium-pressure cylinder inlet heat exchanger 34, medium-pressure main air hot section pipeline 35, medium-pressure cylinder temporary pipeline 36, front pipeline 37 of low-pressure cylinder inlet heat exchanger, low-pressure main air hot section pipeline 38, low-pressure cylinder inlet heat exchanger 39, medium and low-pressure cylinder temporary pipelines 40, exhaust pipeline 41, electric target plate device 42.

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

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0047] The present invention proposes a novel pipeline purge layout method based on a large-scale non-supplementary fired compressed gas energy storage power station. The layout method can solve the difficult problems of the pipeline purge process of the current large-scale non-supplementary fired compressed gas energy storage power station, and adopts a full-process, multi-stage purge method on the compression side and the expansion side, which solves the drawbacks of the segmented purge layout method, simplifies the steps required for the purge process, adopts the same gas source for the purge operation, reduces the cost, and avoids the instability caused by the addition of a bypass air inlet channel.

[0048] In order to achieve the above object, the technical solution of the present invention is as follows:

[0049] A pipeline purging arrangement method for a large compressed gas energy storage power station. Before the pipeline is purged, the throttling orifice plate, nozzle, valve core, and filter screen are taken out and properly stored, and reinstalled after the purging is completed; the 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 main pipe, 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. Take out the throttling orifice plate, nozzle, valve core, and filter screen, and reinstall them after the purge is completed; at the same time, isolate or protect the meters and sensors in the pipeline.

[0052] S2, using a compressor as the gas source, purge a compressor outlet pipe and a compression side vent pipe. Figure 2 As shown, specifically including:

[0053] (1) a compressor section 2 → a compressor outlet pipe section 4 → a vent pipe section 3 → vent main pipe 7 → vent silencer 8 → discharge to air; corresponding to step S201.

[0054] S201, air enters the compressor 2 through the air filter 1 and starts to purge the pipeline. First, air enters the compressor outlet pipe 4, and then a part of it passes through a vent pipe 3, a vent main pipe 7, and a vent silencer 8 before being discharged into the air.

[0055] (2) a compressor section 2 → a compressor outlet pipe section 4 → a temporary pipe section 5 in front of a gas-water heat exchanger (a temporary pipe is disconnected in front of a gas-water heat exchanger 1, and the heat exchanger side is sealed) → a temporary silencer tower 6 → discharge into the air; corresponding to step S202.

[0056] S202, air enters the compressor 2 through the air filter 1 and starts to purge the pipeline. First, the air enters the compressor outlet pipe 4, and the other part passes through the temporary pipe 51 in front of the air-water heat exchanger and the temporary silencer tower 6 and is discharged into the air.

[0057] S3, using the first stage compressor as the air source, purge the second stage compressor outlet pipe, the second and third stage anti-surge pipes and the third stage vent pipe. Figure 3 As shown, specifically including:

[0058] (1) a first-stage compressor 2 → a first-stage compressor outlet pipeline 4 → a first-stage air-water heat exchanger 10 → a first-stage air-water separator 11 → a second-stage compressor air inlet pipeline 12 → a second-stage temporary pipeline 13 → a second-stage compressor air outlet pipeline 14 → a temporary pipeline 52 in front of the second-stage air-water separator (disconnect the temporary pipe in front of the second-stage air-water heat exchanger 1, and seal the heat exchanger side) → a temporary silencer tower 6 → discharge into the air; corresponding to step S301.

[0059] S301, air enters the first compressor 2 through the air filter 1 and starts to purge the pipeline. First, it enters the first compressor outlet pipe 4, and then a part of it passes through the first air-water heat exchanger 10 and the first air-water separator 11 to enter the second compressor inlet pipe 12, passes through the second temporary pipe 13 and the second compressor outlet pipe 14, and then passes through the temporary pipe 52 before the second air-water separator and the temporary silencer 6 and is discharged into the air.

[0060] (2) first-stage compressor 2 → first-stage compressor outlet pipeline 4 → second-stage anti-surge pipeline 9 → second-stage compressor outlet pipeline 14 → third-stage anti-surge pipeline 16 → third-stage compressor outlet pipeline 17 → third-stage venting pipeline 18 → venting main pipe 7 → venting silencer 8 → discharge to air; corresponding to step S302.

[0061] S302, air enters the first-stage compressor 2 from the air filter 1 and starts to purge the pipeline. First, the air enters the first-stage compressor outlet pipe 4, and the other 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 passes through the third-stage vent pipe 18, the vent main pipe 7, and the vent silencer 8 before being discharged into the air.

[0062] S4. Use the first stage compressor as the gas source to purge the outlet pipes of the third stage compressor and the second stage vent pipe. Figure 4 As shown, specifically including:

[0063] (1) a first-stage compressor 2 → a first-stage compressor outlet pipeline 4 → a first-stage air-water heat exchanger 10 → a first-stage air-water separator 11 → a second-stage compressor air inlet pipeline 12 → a second-stage temporary pipeline 13 → a second-stage compressor air outlet pipeline 14 → a second-stage air-water heat exchanger 20 → a second-stage air-water separator 21 → a third-stage compressor air inlet pipeline 22 → a third-stage temporary pipeline 23 → a third-stage compressor air outlet pipeline 17 → a third-stage air-water heat exchanger 25 → a third-stage air-water separator 26 → a venting pipeline 27 before the injection-production main pipe → venting the main pipe 7 → venting the silencer 8 → discharge into the air; corresponding to step S401.

[0064] S401, air enters the first compressor 2 through the air filter 1 and starts to purge the pipeline. First, after entering the first compressor outlet pipeline 4, a part of it passes through the first air-water heat exchanger 10 and the first air-water separator 11 to enter the second compressor inlet pipeline 12, through the second temporary pipeline 13, the second compressor outlet pipeline 14, the second air-water heat exchanger 20, the second air-water separator 21, and then through the third compressor inlet pipeline 22, the third temporary pipeline 23, the third compressor outlet pipeline 17, the third air-water heat exchanger 25, the third air-water separator 26, the venting pipeline 27 before the injection and production main pipe, and enters the venting main pipe 7 and the venting silencer 8 before being discharged into the air.

[0065] (2) First stage compressor 2 → first stage compressor outlet pipeline 4 → second stage anti-surge pipeline 9 → second stage compressor outlet pipeline 14 → second stage venting pipeline 19 → venting main pipe 7 → venting silencer 8 → discharge to air; corresponding to step S402.

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

[0067] S5. Use the first and second stage compressors as the gas source to purge the pipeline after the third stage compressor, the injection and production main pipe, the high-pressure cylinder inlet pipeline and the pipeline before the medium-pressure heat exchanger inlet. Figure 5 As shown, specifically including:

[0068] First stage compressor 2 → first stage compressor outlet pipeline 4 → first stage air-water heat exchanger 10 → first stage air-water separator 11 → second stage compressor air inlet pipeline 12 → second stage compressor 15 → second stage compressor air outlet pipeline 14 → second stage air-water heat exchanger 20 → second stage air-water separator 21 → third stage compressor air inlet pipeline 22 → third stage temporary pipeline 23 → third stage compressor air outlet pipeline 17 → third stage air-water heat exchanger 25 → third stage air-water separator 26 → salt cavern injection and production main pipe 28 → high pressure main air cooling section pipeline 29 → high pressure cylinder inlet heat exchanger 30 → high pressure main air heating section pipeline 31 → high pressure cylinder temporary pipeline 32 → medium pressure cylinder inlet heat exchanger front pipe 33 → venting main pipe 7 → venting silencer 8 → discharge to air; the specific process is as follows:

[0069] The first and second end compressors are used as air sources to purge the pipeline. The air enters the first compressor 2 from the air filter 1 to start purging the pipeline. The air first enters the first compressor outlet pipeline 4, then passes through the first air-water heat exchanger 10 and the first air-water separator 11 to enter the second compressor intake pipeline 12. After starting from the second compressor 15, the air first enters the second compressor outlet pipeline 14, the second air-water heat exchanger 20, and the second air-water separator 21, and then passes through the third compressor intake pipeline 22, the third temporary pipeline 23, the third compressor outlet pipeline 17, the third air-water heat exchanger 25, and the third air-water separator 26, and enters the salt cavern injection and production mother pipe 28 before entering the expansion side pipeline, first entering the high-pressure main air cooling section pipeline 29, the high-pressure cylinder inlet heat exchanger 30, the high-pressure main air hot section pipeline 31, the high-pressure cylinder temporary pipeline 32, and the medium-pressure cylinder inlet heat exchanger front pipeline 33, and then enters the venting mother pipe 7, the venting silencer 8, and then discharged into the air.

[0070] S6. Use the first and second stage compressors as the gas source to purge the high and medium pressure cylinder inlet pipelines and the low pressure cylinder inlet heat exchanger pipeline.

[0071] like Figure 6 As shown, specifically including:

[0072] First stage compressor 2 → first stage compressor outlet pipeline 4 → first stage air-water heat exchanger 10 → first stage air-water separator 11 → second stage compressor air inlet pipeline 12 → second stage compressor 15 → second stage compressor air outlet pipeline 14 → second stage air-water heat exchanger 20 → second stage air-water separator 21 → salt cavern injection and production main pipe 28 → high pressure main air cooling section pipeline 29 → high pressure cylinder inlet heat exchanger 30 → high pressure main air heating 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 air heating section pipeline 35 → medium pressure cylinder temporary pipeline 36 → low pressure cylinder inlet heat exchanger front pipeline 37 → venting main pipe 7 → venting silencer 8 → discharge to air; the specific process is as follows:

[0073] Starting from step S6, the three-stage compressor pipeline is no longer purged, and is directly connected to the salt cavern injection and production main pipe 28 behind the second-stage gas-water separator 21 and then enters the expansion side pipeline. That is, air enters the first compressor 2 from the air filter 1 and starts to purge the pipeline. It first enters the first compressor outlet pipeline 4 and then passes through the first air-water heat exchanger 10 and the first air-water separator 11 to enter the second compressor inlet pipeline 12. After starting from the second compressor 15, the air first enters the second compressor outlet pipeline 14, the second air-water heat exchanger 20, and the second air-water separator 21, and then enters the expansion side pipeline after entering the salt cavern injection and production mother pipe 28. It first enters the high-pressure main air cooling section pipeline 29, the high-pressure cylinder inlet heat exchanger 30, the high-pressure main air hot section pipeline 31, the high-pressure cylinder temporary pipeline 32, the medium-pressure cylinder inlet heat exchanger front pipeline 33, the medium-pressure cylinder inlet heat exchanger 34, the medium-pressure main air hot section pipeline 35, the medium-pressure cylinder temporary pipeline 36, the low-pressure cylinder inlet heat exchanger front pipeline 37, and then enters the venting mother pipe 7, the venting silencer 8, and then is discharged into the air.

[0074] S7. Use the first and second stage compressors as the air source to purge the high, medium and low pressure cylinder inlet pipelines and exhaust pipelines. Figure 7 As shown, specifically including:

[0075] First stage compressor 2 → first stage compressor outlet pipeline 4 → first stage air-water heat exchanger 10 → first stage air-water separator 11 → second stage compressor air inlet pipeline 12 → second stage compressor 15 → second stage compressor air outlet pipeline 14 → second stage air-water heat exchanger 20 → second stage air-water separator 21 → salt cavern injection and production mother pipe 28 → high pressure main air cooling section pipeline 29 → high pressure cylinder inlet heat exchanger 30 → high pressure main air heating 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 air heating 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 air heating section pipeline 38 → medium and low pressure cylinder temporary pipeline 40 → exhaust pipeline 41 → electric target plate device 42 → venting silencer 8 → discharge to air; the specific process is as follows:

[0076] Step S7 is performed on the basis of S6, using the first and second end compressors as the air source to purge the pipeline. That is, the air enters the first compressor 2 from the air filter 1 to start purging the pipeline, first enters the first compressor outlet pipeline 4, then passes through the first air-water heat exchanger 10 and the first air-water separator 11 to enter the second compressor inlet pipeline 12, and after the air leaves the second compressor 15, it first enters the second compressor outlet pipeline 14, the second air-water heat exchanger 20, and the second air-water separator 21, passes into the salt cavern injection and production main pipe 28, and then enters the expansion side pipeline, first passing into the high-pressure main air cooling section pipeline 29 , 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, exhaust pipeline 41, and then pass through the electric target plate device 42 for plate detection and then pass through the venting silencer tower 8 to discharge into the air.

[0077] In one embodiment, when purging the entire compressed air energy storage main system, the unit adopts a steady-pressure purge method, installs a target plate at the low-pressure cylinder exhaust pipe, selects an air turbine inlet pressure of 0.4 to 1.5 MPa, and a temperature of 40 to 180°C, and the specific blowing parameters can be adjusted accordingly depending on the actual blowing effect.

[0078] In one embodiment, the check valve in the purge range is replaced by a blocking plate for the first purge, the pipeline before the check valve is purged, the check valve is replaced with an equal-diameter straight pipe, and the unit is restored after the purge is completed. The throttling orifice, nozzle, valve core, filter screen and other devices within the blow pipe range should be removed, the flow meter is replaced with an equal-diameter short pipe, and the air compressor flow nozzle is restored after the compressor side is purged and qualified.

[0079] The new pipeline purge layout method based on a large-scale non-supplementary combustion compressed air energy storage power station proposed in the present invention is a full-process, multi-stage, integrated new pipeline purge layout method proposed based on a 300MW compressed air energy storage power station project. It fills the gap in the pipeline purge layout method of large-scale non-supplementary combustion compressed air energy storage power stations at home and abroad. Compared with the previous segmented purge, the full-process, multi-stage purge method proposed in the present invention can reduce a lot of preliminary work. Compared with the segmented purge, the purge method of the present invention reduces the modification work of the main system, which is of great significance to the smooth operation of the system.

[0080] The present invention proposes a novel pipeline purge arrangement method based on a large-scale non-supplementary combustion compressed gas energy storage power station, which uses one or two stage compressors as gas sources to purge the pipeline. The pipeline purge work can be flexibly adjusted according to the pressure and temperature required for the purge. Compared with the traditional ventilation method that requires the addition of multiple gas sources through side doors, it has the advantages of simple operation, flexibility and high stability.

[0081] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pipeline purge arrangement method for a large compressed gas energy storage power station, characterized in that: The inlet pipelines of the three-stage compressor on the compression side, the anti-surge pipeline, the vent valve, the injection and production main pipe, and the inlet pipelines of the high, medium and low pressure cylinders on the expansion side are purged, including: S1. Take out the throttling 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 gas source, purge a compressor outlet pipe and a compression side vent pipe; S3, using the first stage compressor as the gas 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 gas source, purge the outlet pipes of the third stage compressor and the second stage vent pipe; S5. Use the first and second stage compressors as the gas source to purge the pipeline after the third stage compressor, the injection and production main pipe, the high-pressure cylinder inlet pipeline and the pipeline before the medium-pressure heat exchanger inlet; S6. Use the first and second stage compressors as the gas source to purge the high and medium pressure cylinder inlet pipelines and the low pressure cylinder inlet heat exchanger pipeline; S7. Use the first and second stage compressors as the air source to purge the high, medium and low pressure cylinder inlet pipelines and exhaust pipelines.

2. The pipeline purging arrangement method of a large-scale compressed gas energy storage power station according to claim 1 is characterized in that: The step S2 specifically includes: S201, air enters the compressor through the air filter to start purging the pipeline, and after entering the outlet pipeline of the compressor, part of the air passes through a venting pipeline, a venting main pipe, and a venting silencer tower, and then is discharged into the air; S202, air enters the compressor through the air filter and starts to purge the pipeline. After entering the outlet pipe of the compressor, the other part passes through a temporary pipe in front of an air-water heat exchanger and a temporary silencer tower and is discharged into the air.

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

4. The pipeline purging arrangement method of a large-scale compressed gas energy storage power station according to claim 1 is characterized in that: The step S4 specifically includes: S401, air enters the first compressor through the air filter and starts to purge the pipeline. After entering the outlet pipeline of the first compressor, part of the air passes through the first air-water heat exchanger and the first air-water separator and enters the second compressor inlet pipeline, passes through the second temporary pipeline, the second compressor outlet pipeline, the second air-water heat exchanger, the second air-water separator, and then passes through the third compressor inlet pipeline, the third temporary pipeline, the third compressor outlet pipeline, the third air-water heat exchanger, the third air-water separator, and the venting pipeline before the injection and production main pipe, and enters the venting main pipe and the venting silencer before being discharged into the air; S402, air enters the first compressor through the air filter and starts to purge the pipeline. After entering the first compressor outlet pipe, the other part passes through the second anti-surge pipe, the second compressor outlet pipe, the second vent pipe, and then enters the vent main pipe and the vent silencer tower and is discharged into the air.

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

6. The pipeline purging arrangement method of a large-scale compressed gas energy storage power station according to claim 1 is characterized in that: The step S6 specifically includes: The air enters the first compressor from the air filter and starts to purge the pipeline. It first enters the outlet pipeline of the first compressor and then passes through a first air-water heat exchanger and a first air-water separator to enter the air inlet pipeline of the second compressor. After leaving the second compressor, the air first enters the air outlet pipeline of the second compressor, the second air-water heat exchanger, and the second air-water separator. After entering the salt cavern injection and production mother pipe, it enters the expansion side pipeline. It first enters the high-pressure main air cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main air hot section pipeline, the high-pressure cylinder temporary pipeline, the medium-pressure cylinder inlet heat exchanger front pipeline, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main air hot section pipeline, the medium-pressure cylinder temporary pipeline, the low-pressure cylinder inlet heat exchanger front pipeline, and then enters the venting mother pipe, and then discharges into the air after the venting silencer.

7. The pipeline purging arrangement method of a large-scale compressed gas energy storage power station according to claim 1 is characterized in that: The step S7 specifically includes: The air enters the first compressor from the air filter and starts to purge the pipeline. It first enters the outlet pipeline of the first compressor and then passes through a first air-water heat exchanger and a first air-water separator to enter the air inlet pipeline of the second compressor. After leaving the second compressor, the air first enters the air outlet pipeline of the second compressor, the second air-water heat exchanger, and the second air-water separator. After entering the salt cavern injection and production mother pipe, it enters the expansion side pipeline. It first enters the high-pressure main air cooling section pipeline, the high-pressure cylinder inlet heat exchanger, the high-pressure main air hot section pipeline, the high-pressure cylinder temporary pipeline, the medium-pressure cylinder inlet heat exchanger front pipeline, the medium-pressure cylinder inlet heat exchanger, the medium-pressure main air hot section pipeline, the medium-pressure cylinder temporary pipeline, the low-pressure cylinder inlet heat exchanger front pipeline, the low-pressure cylinder inlet heat exchanger, the low-pressure main air hot section pipeline, the medium and low-pressure cylinder temporary pipeline, and the exhaust pipeline. After the plate detection is carried out by the electric target plate device, it is discharged into the air after passing through the venting silencer tower.

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

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

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