Emergency gas turbine fast start system and method based on compressed air energy storage

Abstract

The application provides an emergency gas turbine quick start system and method based on compressed air energy storage, and belongs to the technical field of gas turbines. The application comprises a compressed air energy storage device, which is used for releasing high-pressure air to be directly injected into a combustion chamber in a quick start stage to reach an ignition condition. In the quick start stage, the compressed air is directly injected into the combustion chamber, bypassing the low-efficiency air supply of a low-speed stage compressor, rapidly reaching the ignition condition, immediately entering a hot acceleration stage after ignition, and omitting a traditional purging and blowing process, thereby greatly reducing the start time of the gas turbine.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, and in particular to an emergency gas turbine rapid start-up system based on compressed air energy storage and a start-up method for the system, which is suitable for scenarios such as emergency power supplies where rapid start-up performance is required. Background Technology

[0002] Gas turbines, due to their small size, simple structure, ease of maintenance, rapid start-up, high power density, and good reliability, are widely used in emergency power supplies, military equipment, and data center backup power generation. In recent years, research on their application in nuclear power plant safety systems has gradually unfolded, and their start-up performance directly affects emergency response capabilities. (1) Nuclear Emergency Scenario: Nuclear power plant safety systems require on-site emergency power supplies to start rapidly in the event of a major accident. For example, third-generation nuclear power technologies such as US-APWR require startup within 100 seconds. However, the traditional gas turbine purging process typically takes 3 to 6 minutes, severely limiting the response speed. If emergency gas turbines are used in nuclear power plant safety systems, their startup time is a key indicator for measuring safety assurance capabilities. Therefore, it is urgent to optimize the startup process of gas turbine generator sets to shorten the startup time.

[0003] For example, the invention patent with authorization announcement number CN110425044B discloses a gas turbine start-up optimization system and its working method. By setting a gas detector and moving the purging process to the routine maintenance operation, the start-up step can be optimized.

[0004] (2) Combustion stability challenge: A stable airflow needs to be established before ignition. Gas turbine compressors are less efficient at low speeds, which can easily lead to insufficient combustion chamber pressure and deterioration of ignition conditions. Therefore, how to provide a stable and controlled high-pressure gas source and controllable combustion conditions in the initial stage when the gas turbine fails to establish its own high-pressure airflow, so as to achieve a smooth, fast and safe start-up, is the core challenge of current technological development.

[0005] (3) Existing starting methods: Current gas turbine starting methods mainly include electric starting and auxiliary internal combustion engine starting.

[0006] electric start system Solution: A high-power electric motor is used to drive the main shaft of the gas turbine to accelerate to the ignition speed. Then, the gas turbine ignites and generates high-temperature and high-pressure flue gas to drive the turbine to do work and accelerate its rotation. After accelerating to a specific speed, the motor is disconnected and the gas turbine enters the self-acceleration stage.

[0007] Disadvantages: It relies on the power grid or large-capacity batteries, resulting in high energy consumption; it is prone to failure in extreme environments and power outage scenarios, and the electric motor is bulky and expensive.

[0008] Assisted diesel engine starting (see journal article "9E Gas Turbine Black Start Scheme and Practice") Solution: Power the starter motor with a diesel generator to drive the gas turbine main shaft to rotate faster. This solution is suitable for situations where there is no electricity, such as on ships, or where a black start of the gas turbine is required due to power system failure.

[0009] Disadvantages: Long start-up time (diesel engine needs to be started first), complex process, serious pollution, large size and complicated maintenance.

[0010] Other research, such as papers: [Kim MJ, Kim TS Integration of compressed air energy storage and gas turbine to improve the ramp rate[J].Applied Energy,2019,247:363-373] proposed integrating compressed air energy storage with a gas turbine. By dynamically optimizing the compressed air injection strategy, the power ramp rate of the gas turbine during operation can be improved, while suppressing combustion chamber temperature fluctuations.

[0011] Its core solution: System Integration: When the gas turbine load increases, the compressed air energy storage system injects compressed air into the combustion chamber to replace part of the fuel consumption, quickly increasing power output while maintaining turbine inlet temperature fluctuations within a safe level.

[0012] Application scenarios: To meet the frequency regulation requirements of the power grid, enhance the load following capability of gas turbines in environments with high penetration of renewable energy, and reduce the impact of thermal stress on turbine life.

[0013] This paper focuses on power regulation (ramp rate optimization) during the operation phase, rather than rapid response during the startup phase.

[0014] Its control logic is as follows: air injection is used to replace fuel to control temperature, while this patent requires the direct use of high-pressure air to establish a stable airflow during the start-up phase to assist ignition and acceleration.

[0015] This paper provides a theoretical basis for the coordinated control of gas turbines and compressed air energy storage, but does not cover key technologies in rapid start-up scenarios.

[0016] In summary, the existing technology has the following main drawbacks: (1) Slow start-up response: Traditional gas turbines mainly rely on electric motors, battery packs or auxiliary power devices (such as small diesel engines) to start, which has the problems of slow speed increase and long start-up time (usually 5 to 10 minutes), making it difficult to meet the rapid start-up requirements of seconds to minutes in emergency scenarios.

[0017] (2) Poor system stability: Under the traditional start-up method, the compressor load is high and the air flow is insufficient in the low-speed stage (before the ignition speed) of the gas turbine. It is difficult to form a stable airflow in the combustion chamber. Forced ignition may lead to ignition failure, flameout or backfire.

[0018] (3) Limited by grid conditions: Traditional electric starting systems cannot work in special scenarios such as isolated grid operation or power outage, and have the limitation of strong dependence on starting energy; although auxiliary diesel engine starting can be powered independently, it has disadvantages such as large size, high emissions, complex starting process and high maintenance cost, and is difficult to adapt to extreme environments. Summary of the Invention

[0019] In view of this, in order to solve the technical problems of slow speed ramp-up and long start-up time in the prior art, on the one hand, the present invention provides an emergency gas turbine rapid start-up system based on compressed air energy storage. In the rapid start-up phase, compressed air energy storage device directly supplies air to the combustion chamber. Combined with the coordinated control of three-way valve and bypass valve, it bypasses the inefficient air supply of the compressor in the low-speed phase, quickly reaches the ignition conditions, and immediately enters the thermal acceleration phase after ignition. It also eliminates the traditional purge process and significantly reduces the gas turbine start-up time.

[0020] To achieve the above objectives, the present invention provides the following technical solution: An emergency gas turbine rapid start-up system based on compressed air energy storage includes: The compressed air energy storage device is used to release high-pressure air directly into the combustion chamber during the rapid start-up phase to achieve ignition conditions.

[0021] Preferably, the compressed air energy storage device includes: Air storage tank, used to store compressed air; A pressurization device is used to compress and store external air into the air storage tank to maintain the pressure of the air storage tank.

[0022] Preferably, the pressurizing device is an air compressor, used to compress external air and store it in the air tank to maintain the pressure of the air tank.

[0023] To address the technical problem of poor system stability in existing technologies, preferably, it further includes: A pressure reducing valve is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber, and is used to adjust the pressure of the compressed air in the air storage tank to a pressure range suitable for the combustion chamber.

[0024] Preferably, it further includes: A heat exchanger is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber, and is located after the pressure reducing valve. It has a heat exchange heat source for exchanging heat with the low-pressure air after the pressure reducing valve, so as to avoid the sudden drop in temperature caused by pressure reduction affecting the combustion efficiency and ignition stability, and to ensure that the temperature of the airflow entering the combustion chamber is stable within a preset range.

[0025] Preferably, it further includes: The gas turbine compressor is connected to the compressed air energy storage device and the combustion chamber via a three-way valve. The three-way valve is used to control the airflow path. During the rapid start-up phase, it closes the compressor-side passage of the gas turbine, so that the combustion chamber is supplied with air only by the compressed air energy storage device; during normal operation, it switches to the gas turbine compressor supply mode.

[0026] Preferably, it further includes: A bypass valve is connected to the gas turbine compressor to directly discharge the low-pressure air discharged from the gas turbine compressor into the atmosphere.

[0027] Preferably, it further includes: The gas turbine connects the combustion chamber and the gas turbine compressor.

[0028] Preferably, during the rapid start-up phase, the gas turbine is driven to rotate at low speed by the high-temperature and high-pressure gas generated in the combustion chamber, and then enters the thermal acceleration phase, which drives the gas turbine compressor to rotate and accelerate until it reaches the rated speed. During normal operation, the high-temperature and high-pressure gas generated in the combustion chamber drives the rotation, outputting mechanical energy to drive a generator or load.

[0029] On the other hand, the present invention also provides a starting method for the above-mentioned emergency gas turbine rapid start-up system based on compressed air energy storage, comprising the following steps: Step (1), rapid start-up phase: After receiving the start-up command, the three-way valve immediately closes the gas turbine compressor side passage to ensure that the combustion chamber is supplied with air only by the compressed air energy storage device, and the compressed air energy storage device directly injects compressed air into the combustion chamber; Step (2), Bypass Exhaust: At the same time as step (1), the bypass valve is opened to directly discharge the low-pressure air discharged from the gas turbine compressor into the atmosphere; Step (3), Ignition and acceleration: Fuel and compressed air are mixed and ignited to generate high-temperature and high-pressure gas, which drives the gas turbine to rotate rapidly, causing the gas turbine to enter the thermal acceleration stage; Step (4) Switch to normal operation: When the speed of the gas turbine compressor approaches the rated value, the three-way valve switches to the gas turbine compressor supply mode, the bypass valve is closed, the combustion chamber is switched to high-efficiency gas supply from the gas turbine compressor, the compressed air energy storage device stops supplying gas, and the system enters steady-state operation. Step (5) Compressed air energy storage device pressurization: During normal operation or shutdown, the air compressor starts up, compresses the outside air and stores it in the compressed air energy storage device to prepare for the next start-up.

[0030] Compared with the prior art, the present invention has the following beneficial effects: (1) Startup response speed is significantly improved This invention employs a compressed air energy storage device to directly inject compressed air into the combustion chamber, bypassing the inefficient air supply process of the compressor during the low-speed phase and eliminating the traditional 3-6 minute pre-start purging process. This reduces the start-up time from the traditional 5-10 minutes to within 40 seconds, meeting the rapid start-up requirements of nuclear emergency scenarios, ranging from seconds to minutes.

[0031] (2) Combustion stability is greatly enhanced during the start-up phase. By precisely regulating the pressure through a pressure reducing valve, the 3MPa high-pressure air from the compressed air energy storage device is reduced to 0.9MPa, suitable for the combustion chamber (data taken for a 6MW gas turbine), preventing overpressure damage and maintaining stable airflow. During startup, the bypass valve opens to discharge low-pressure air from the compressor, and the three-way valve closes the compressor-side passage. The coordinated control of the bypass exhaust and the three-way valve ensures that the combustion chamber is supplied with air solely by the storage tank, eliminating airflow interference at low speeds. This solves the problems of ignition failure, flameout, or backfire caused by low compressor efficiency in traditional startup methods, improving the ignition success rate.

[0032] (3) Achieve completely independent black start capability This invention integrates a self-sustaining high-pressure air storage tank, eliminating the need for a power grid or auxiliary diesel engine. It utilizes an air compressor to replenish pressure during normal operation or shutdown, forming an independent energy closed loop. It can still start stably in power outages, isolated grid conditions, or extreme environments, overcoming the grid dependence of traditional electric starting systems and the high pollution and maintenance costs associated with diesel engine starting.

[0033] (4) Simplified system structure and improved maintenance convenience This invention eliminates the complex components required for traditional starting systems, such as large-capacity battery packs, electric starter motors, or diesel engines. Through modular integration of the gas storage tank, valve assembly, and heat exchange system, it reduces system size and maintenance requirements. It is suitable for scenarios with stringent requirements for compactness and reliability, such as emergency power supplies and military equipment, thereby reducing long-term operation and maintenance costs.

[0034] (5) Energy efficiency and adaptability optimization during operation This invention integrates a heat exchange system, which connects a heat exchanger in series after the pressure reducing valve. The heat source within the heat exchanger regulates the gas supply temperature, avoiding the sudden temperature drop caused by pressure reduction that could affect combustion efficiency and further ensuring ignition stability.

[0035] The invention also integrates dynamic switching logic, which automatically switches to the compressor's normal air supply mode when the speed approaches the rated value, achieving a seamless connection between startup and steady-state operation, and taking into account both rapid response and long-term operational economy.

[0036] In summary, this invention achieves breakthroughs in response speed, stability, independence, and system simplification through the deep integration of compressed air energy storage and gas turbine startup process, making it particularly suitable for fields with extremely high startup performance requirements, such as emergency power supplies and nuclear power safety systems. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a flowchart of the maintenance and inspection process before startup. Figure 3 This is a flowchart illustrating the startup process of the present invention; In the diagram, 1. Gas turbine compressor; 2. Combustion chamber; 3. Gas turbine; 4. Gas storage tank; 5. Pressure reducing valve; 6. Three-way valve; 7. Bypass valve; 8. Heat source; 9. Heat exchanger; 10. Air compressor. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] like Figure 1 As shown, this invention provides an emergency gas turbine rapid start-up system based on compressed air energy storage, comprising: The compressed air energy storage device is used to release high-pressure air directly into the combustion chamber 2 during the rapid start-up phase to achieve ignition conditions.

[0042] In this invention, the combustion chamber 2 is used to mix and ignite fuel with compressed air to generate high-temperature, high-pressure gas to drive the gas turbine 3 described below. The compressed air energy storage device preferably includes an air tank 4 (for storing compressed air) and a pressurization device (for compressing and storing external air into the air tank 4 to maintain the pressure of the air tank 4). The pressurization device is preferably an air compressor 10, which compresses and stores external air into the air tank 4 when the system is idle or the pressure in the air tank 4 is low to maintain the pressure in the air tank 4. By pre-pressurizing the air tank 4 with the air compressor 10, a stable high-pressure air source is provided for the rapid start-up phase, ensuring a reserve of air source for the next start-up. The air tank 4 stores high-pressure air, providing an independent air source during the start-up phase, bypassing the inefficient phase of the compressor, shortening the start-up time, and improving the response speed.

[0043] To address the technical problem of poor system stability in existing technologies, this invention further includes: Pressure reducing valve 5 is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber 2, and is used to adjust the pressure of the compressed air in the air storage tank 4 to a pressure range suitable for the combustion chamber 2. For example, it reduces the pressure of the high-pressure air in the air storage tank 4 from about 3MPa (data for a 6MW gas turbine) to a low-pressure range (0.9MPa) suitable for the combustion chamber 2, so as to avoid overpressure damage to the equipment and maintain stable airflow.

[0044] This invention also includes: The heat exchanger 9 is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber 2, and is located after the pressure reducing valve 5. It has a heat exchange heat source 8 inside, which is used to exchange heat with the low-pressure air after the pressure is adjusted by the pressure reducing valve 5, so as to avoid the sudden drop in temperature caused by pressure reduction affecting the combustion efficiency and ignition stability, and to ensure that the temperature of the airflow entering the combustion chamber 2 is stable within a preset range.

[0045] This invention also includes: The gas turbine compressor 1 is connected to the compressed air energy storage device and the combustion chamber 2 respectively via a three-way valve 6; The three-way valve 6 is used to control the airflow path. During the rapid start-up phase, it closes the channel on the side of the gas turbine compressor 1, so that the combustion chamber 2 is supplied with air only by the compressed air storage device. During normal operation, it switches to the gas turbine compressor 1 supply mode. During normal operation, compressed air is delivered to the combustion chamber 2 via the gas turbine compressor 1. During the rapid start-up phase, because the gas turbine compressor 1 operates at low speed and has insufficient efficiency, its exhaust is directly discharged to the atmosphere through the bypass valve 7 to avoid interfering with the air supply of the storage tank 4.

[0046] This invention also includes: The bypass valve 7 is connected to the gas turbine compressor 1, allowing the low-pressure air discharged from the gas turbine compressor 1 to be directly released into the atmosphere, avoiding airflow interference with the gas supply from the gas storage tank 4. Through proper regulation of the bypass valve 7, the clean airflow during the rapid start-up phase is ensured, improving combustion efficiency, reducing equipment wear, extending service life, and achieving efficient and stable system operation.

[0047] This invention also includes: The gas turbine 3 connects the combustion chamber 2 and the gas turbine compressor 1. The gas turbine 3 utilizes high-temperature, high-pressure gas to convert thermal energy into mechanical energy, outputting efficient power.

[0048] In this invention, during the rapid start-up phase, the gas turbine 3 is driven to rotate at low speed by the high-temperature and high-pressure gas generated in the combustion chamber 2, and enters the thermal acceleration phase, which drives the gas turbine compressor 1 to rotate and accelerate until the rated speed. During normal operation, the high-temperature and high-pressure gas generated in the combustion chamber 2 drives the rotation, outputting mechanical energy to drive the generator or load.

[0049] The working principle of the fast startup system provided by this invention is as follows: Start-up phase: Gas tank 4 provides independent gas supply → Pressure reducing valve 5 regulates pressure and heat exchange controls temperature → Three-way valve 6 and bypass valve 7 work together to isolate the compressor → Combustion chamber 2 provides stable ignition → Turbine drives acceleration.

[0050] Operation switching: When the speed approaches the rated value, the three-way valve 6 switches to compressor gas supply, the bypass valve 7 closes, and the system enters steady-state operation.

[0051] Energy closed loop: The air compressor 10 replenishes pressure during non-start-up periods, forming a self-sustaining energy cycle system of "storage-release-replenishment".

[0052] In summary, this invention achieves a comprehensive breakthrough in terms of start-up speed, stability, independence, and system simplification through its innovative design of "4 independent gas supply tanks + valve coordinated control + heat exchange temperature regulation," making it particularly suitable for emergency and safety assurance fields with stringent start-up performance requirements.

[0053] like Figure 3 As shown, on the other hand, the present invention also provides a starting method for the above-mentioned emergency gas turbine rapid start-up system based on compressed air energy storage, and the maintenance and inspection process before starting the system is as follows: Figure 2 As shown, this maintenance and inspection process is a standard procedure in this field and will not be elaborated upon here. Figure 2 The process shown can be followed. The startup method provided by this invention includes the following steps: Step (1), rapid start-up phase: Three-way valve 6 closes the gas turbine compressor 1 side passage to ensure that combustion chamber 2 is supplied with air only by compressed air energy storage device, and compressed air energy storage device directly injects compressed air into combustion chamber 2; Step (2), Bypass Exhaust: At the same time as step (1), the bypass valve 7 is opened to directly discharge the low-pressure air discharged from the gas turbine compressor 1 into the atmosphere; Step (3), Ignition and acceleration: Fuel and compressed air are mixed and ignited to generate high-temperature and high-pressure gas, which drives the gas turbine turbine 3 to rotate rapidly, so that the gas turbine enters the thermal acceleration stage; Step (4) Switch to normal operation: When the speed of gas turbine compressor 1 approaches the rated value, the three-way valve 6 switches to the gas turbine compressor 1 supply mode, the bypass valve 7 closes, the combustion chamber 2 is switched to high-efficiency gas supply from gas turbine compressor 1, the compressed air energy storage device stops supplying gas, and the system enters steady-state operation. Step (5) Compressed air energy storage device pressurization: During normal operation or shutdown, the air compressor 10 starts, compresses the external air and stores it in the compressed air energy storage device to prepare for the next start.

[0054] The above description is merely a preferred embodiment of the present invention. However, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention.

Claims

1. An emergency gas turbine rapid start-up system based on compressed air energy storage, characterized in that, include: The compressed air energy storage device is used to release high-pressure air directly into the combustion chamber during the rapid start-up phase to achieve ignition conditions.

2. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 1, characterized in that, The compressed air energy storage device includes: Air tanks are used to store compressed air; A pressurization device is used to compress and store external air into the air storage tank to maintain the pressure of the air storage tank.

3. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 2, characterized in that, The pressurization device is an air compressor, used to compress external air and store it in the air tank to maintain the pressure of the air tank.

4. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 1, characterized in that, Also includes: A pressure reducing valve is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber, and is used to adjust the pressure of the compressed air in the air storage tank to a pressure range suitable for the combustion chamber.

5. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 4, characterized in that, Also includes: A heat exchanger is connected to the pipeline connecting the compressed air energy storage device and the combustion chamber, and is located after the pressure reducing valve. It has a heat exchange heat source for exchanging heat with the low-pressure air after the pressure reducing valve, so as to avoid the sudden drop in temperature caused by pressure reduction affecting the combustion efficiency and ignition stability, and to ensure that the temperature of the airflow entering the combustion chamber is stable within a preset range.

6. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 1, characterized in that, Also includes: The gas turbine compressor is connected to the compressed air energy storage device and the combustion chamber via a three-way valve. The three-way valve is used to control the airflow path. During the rapid start-up phase, it closes the compressor-side passage of the gas turbine, so that the combustion chamber is supplied with air only by the compressed air energy storage device; during normal operation, it switches to the gas turbine compressor supply mode.

7. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 6, characterized in that, Also includes: A bypass valve is connected to the gas turbine compressor to directly discharge the low-pressure air discharged from the gas turbine compressor into the atmosphere.

8. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 6 or 7, characterized in that, Also includes: The gas turbine connects the combustion chamber and the gas turbine compressor.

9. The emergency gas turbine rapid start-up system based on compressed air energy storage according to claim 8, characterized in that, During the rapid start-up phase, the gas turbine is driven to rotate at low speed by the high-temperature and high-pressure gas generated in the combustion chamber, and then enters the thermal acceleration phase, which drives the gas turbine compressor to rotate and accelerate until it reaches the rated speed. During normal operation, the high-temperature and high-pressure gas generated in the combustion chamber drives the rotation, outputting mechanical energy to drive a generator or load.

10. The starting method of the emergency gas turbine rapid start-up system based on compressed air energy storage according to claims 1-9, characterized in that, Includes the following steps: Step (1), rapid start-up phase: After receiving the start-up command, the three-way valve immediately closes the gas turbine compressor side passage to ensure that the combustion chamber is supplied with air only by the compressed air energy storage device, and the compressed air energy storage device directly injects compressed air into the combustion chamber; Step (2), Bypass Exhaust: At the same time as step (1), the bypass valve is opened to directly discharge the low-pressure air discharged from the gas turbine compressor into the atmosphere; Step (3), Ignition and acceleration: Fuel and compressed air are mixed and ignited to generate high-temperature and high-pressure gas, which drives the gas turbine to rotate rapidly, causing the gas turbine to enter the thermal acceleration stage; Step (4) Switch to normal operation: When the speed of the gas turbine compressor approaches the rated value, the three-way valve switches to the gas turbine compressor supply mode, the bypass valve is closed, the combustion chamber is switched to high-efficiency gas supply from the gas turbine compressor, the compressed air energy storage device stops supplying gas, and the system enters steady-state operation. Step (5) Compressed air energy storage device pressurization: During normal operation or shutdown, the air compressor starts up, compresses the outside air and stores it in the compressed air energy storage device to prepare for the next start-up.

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