A compressed air energy storage power generation system with dehydrated compressed air

Abstract

The application discloses a compressed air energy storage power generation system containing dehydration, and relates to the field of compressed air energy storage power generation. The compressed air energy storage power generation system containing dehydration comprises an energy releasing subsystem and a controller. The energy releasing subsystem comprises a dehydration device, a temperature recovery device and an expansion power generation device. The working medium taken from a gas storage device is dehydrated through the dehydration device, then is heated through the temperature recovery device, and finally enters the expansion power generation device to generate power. The dehydration device comprises a first expander and a first separator. The working medium after passing through the first expander comprises liquid working medium and gaseous working medium. The liquid working medium is separated out through the first separator, and the gaseous working medium flows out of the outlet of the first separator and then flows into the temperature recovery device to be heated. The application solves the technical problem that the water content of the working medium in the compressed air energy storage system in the prior art is difficult to control, has the advantage that the working medium gas is always in a gaseous state in the expansion power generation process, and improves the efficiency and safety of the system.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage power generation, and more particularly to a compressed air energy storage power generation system containing dehydration. Background Technology

[0002] Compressed air power generation technology utilizes compressed air energy storage (CAES) technology to store electrical energy during off-peak hours and release it when needed to generate electricity for grid connection. It is a new energy power generation technology. Its principle is roughly as follows: An air compressor absorbs and compresses air from nature into a high-density, high-pressure energy source, which is then stored. When needed, the compressed air is delivered to an expander through a venting valve and pipeline. The expander is connected to a generator, which drives the generator rotor to generate electricity.

[0003] Underground gas storage devices are widely used in compressed air energy storage systems due to their low cost and large storage capacity. Compressed air extracted from underground reservoirs typically carries saturated water and free water, collectively referred to as water in the compressed air. Due to the presence of water in the compressed air, when the working fluid performs work in the expander and the temperature is below the freezing point of water, the liquid water will freeze and block the flow channels, potentially damaging the machinery. The presence of water in the compressed air also accelerates the corrosion of gas pipelines and equipment, reducing the pipeline's transport capacity and the viscosity of the working fluid in the expander. Therefore, existing technologies must consider improving the material requirements of the entire system, but this often means high costs.

[0004] In the process of developing this invention, the inventors discovered at least the following problems in the prior art: The prior art typically uses solid adsorption devices or solvent absorption devices to remove water; however, solid adsorption devices have high equipment investment costs, expensive consumables, and high heat consumption during regeneration. Solvent absorption devices use triethylene glycol as an adsorbent, and adsorbents such as triethylene glycol are easily oxidized by air.

[0005] Therefore, how to provide a compressed air energy storage and power generation system with dehydration, which will not have free water during operation, ensure the stable operation of the system and improve the efficiency of compressed air in the expander unit, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a compressed air energy storage and power generation system with dehydration, so that the working gas (i.e., compressed air) is always in a gaseous state after entering the expander generator set, thereby improving the system's efficiency and safety.

[0007] To achieve this objective, a compressed air energy storage and power generation system with dehydration is provided, comprising an energy release subsystem and a controller. The energy release subsystem includes a dehydration device, a reheating device, and an expansion power generation device. The working fluid extracted from the gas storage device is dehydrated by the dehydration device, then heated by the reheating device, and finally enters the expansion power generation device to generate electricity. The dehydration device includes a first expander and a first separator. The working fluid after passing through the first expander comprises a liquid working fluid and a gaseous working fluid. The liquid working fluid is separated by the first separator, and the gaseous working fluid flows out of the outlet of the first separator and into the reheating device for heating. A first temperature monitoring device is provided at the outlet of the first expander. The expansion power generation device includes a second expander, and a second temperature monitoring device is provided at the outlet of the second expander. The controller controls the temperature of the first temperature monitoring device to be lower than the temperature of the second temperature monitoring device. When the temperature of the first temperature monitoring device is higher than or equal to the temperature of the second temperature monitoring device, the controller adjusts the reheating device until the temperature of the first temperature monitoring device is lower than the temperature of the second temperature monitoring device.

[0008] Furthermore, the dehydration device also includes a second separator, the outlet of which is connected to the inlet of the first expander; the working fluid extracted from the gas storage device is introduced into the inlet of the second separator.

[0009] Furthermore, the rewarming device includes a first compressor, the air inlet of the first compressor being connected to the air outlet of the first separator; the air outlet of the first compressor being connected to the air inlet of the second expander; and the input shaft of the first compressor being connected to the output shaft of the first expander.

[0010] Furthermore, the reheating device also includes a first heat exchanger, the cold inlet of which is connected to the outlet gas of the first separator, and the cold outlet of the first heat exchanger is connected to the inlet of the second expander; the heat of the hot path of the first heat exchanger is provided by an external heat source.

[0011] Furthermore, the rewarming device also includes a first compressor; the gaseous working fluid exiting the dehydration device is divided into two paths in the rewarming device, the first path enters the first compressor through the first valve, and the second path enters the first compressor after passing through the second valve, the first heat exchanger, and the third valve in sequence; a pressure sensor is provided on the inlet pipe of the first compressor, and the controller controls the opening degree of the second valve according to the pressure value of the pressure sensor.

[0012] Furthermore, the rewarming device also includes a second heat exchanger, the cold inlet of which is connected to the outlet gas of the first separator, and the cold outlet of which is connected to the inlet of the second expander; the heat of the hot path of the second heat exchanger is provided by a cold and heat storage subsystem.

[0013] Furthermore, the cold and heat storage subsystem includes a cold storage tank and a heat storage tank; the thermal inlet of the second heat exchanger is connected to the outlet of the heat storage tank; and the thermal outlet of the second heat exchanger is connected to the inlet of the cold storage tank.

[0014] Furthermore, it also includes a gas storage subsystem, which comprises an energy storage compressor unit, a third heat exchanger, and the gas storage device. The energy storage compressor unit includes at least one second compressor. The hot inlet of the third heat exchanger is connected to the outlet of the energy storage compressor unit, and the hot outlet of the third heat exchanger is connected to the inlet of the gas storage device. The cold inlet of the third heat exchanger is connected to the outlet of the cold storage tank, and the cold outlet of the third heat exchanger is connected to the inlet of the heat storage tank.

[0015] Furthermore, the rewarming device also includes a second heat exchanger, the cold inlet of which is connected to the outlet gas of the first compressor, and the cold outlet of which is connected to the inlet of the second expander.

[0016] Furthermore, the rewarming device also includes a first heat exchanger, the cold inlet of the first heat exchanger being connected to the outlet gas of the first separator, and the cold outlet of the first heat exchanger being connected to the inlet of the first compressor.

[0017] Furthermore, a cold water pump is installed on the outlet pipeline of the cold storage tank, and a hot water pump is installed on the outlet pipeline of the heat storage tank; both the cold water pump and the hot water pump are frequency-controlled pumps.

[0018] Furthermore, the first heat exchanger uses an ambient temperature vaporizer.

[0019] Furthermore, both the first separator and the second separator use cyclone separators.

[0020] Furthermore, the controller controls the temperature of the first temperature monitoring device to be at least 5 degrees Celsius lower than the temperature of the second temperature monitoring device.

[0021] One of the above technical solutions has the following beneficial effects:

[0022] The energy release subsystem of the compressed air energy storage and power generation system with dehydration includes a dehydration device, a reheating device, and an expansion power generation device. For ease of description, the compressed air used in the energy release subsystem is referred to as the working fluid. After being dehydrated by the dehydration device, the working fluid is heated by the reheating device and finally enters the expansion power generation device to generate electricity. The dehydration device includes a first expander and a first separator. The working fluid after passing through the first expander contains both liquid and gaseous working fluid. The liquid working fluid is separated by the first separator, and the gaseous working fluid flows out of the outlet of the first separator and into the reheating device for heating. Because the temperature of the working fluid decreases after passing through the first expander, some of the saturated water in the working fluid is converted into free water, thereby lowering the water dew point of the compressed air working fluid. The outlet of the first expander has a first temperature monitoring device.

[0023] The working fluid is reheated in the reheating device, and its temperature is always higher than its temperature after the first expander, i.e., above the water dew point. Therefore, the working fluid exists in gaseous form in the reheating device. The expansion power generation device includes a second expander. The reheated gaseous working fluid experiences a second temperature drop after passing through the second expander. A second temperature monitoring device is installed at the outlet of the second expander. When the temperature value of the first temperature monitoring device is lower than the temperature value of the second temperature monitoring device, the water dew point of the working fluid is always controlled at the outlet temperature of the first expander. Therefore, the working fluid is also in gaseous state at the outlet of the expansion power generation device.

[0024] The compressed air energy storage and power generation system, including dehydration, includes a controller. The controller maintains the temperature of a first temperature monitoring device below that of a second temperature monitoring device; when the temperature of the first temperature monitoring device is higher than or equal to the temperature of the second temperature monitoring device, the controller adjusts the rewarming device until the temperature of the first temperature monitoring device is lower than that of the second temperature monitoring device. In other words, the water dew point temperature of the entire working fluid is maintained at the working fluid temperature after the first expander.

[0025] Based on this, the compressed air energy storage and power generation system with dehydration is equipped with a dehydration device to control the water dew point temperature of the working fluid. The controller controls the temperature of the working fluid in the subsequent process to keep it always higher than the water dew point temperature adjusted by the dehydration device, so that the working fluid (i.e., compressed air) is always in a gaseous state throughout the entire operation, thereby improving the efficiency and safety of the system. Attached Figure Description

[0026] Figure 1 This is a flowchart of Example 1.

[0027] In the diagram: 110 - Energy storage compressor unit; 111 - Second compressor; 120 - Electric motor; 130 - Gas storage device; 140 - Third heat exchanger; 131 - Gas storage inlet valve; 132 - Gas storage outlet valve; 211 - First expander; 212 - First separator; 213 - Second separator; 214 - First temperature monitoring device; 221 - First compressor; 222 - First heat exchanger; 223 - Second heat exchanger; 224 - ... Three temperature monitoring devices; 225-First valve; 226-Second valve; 227-Third valve; 228-Pressure sensor; 231-Second expander; 232-Second temperature monitoring device; 233-Generator; 310-Cold storage tank; 330-Cold water pump; 320-Heat storage tank; 340-Hot water pump; 321-Heat storage tank outlet valve; 322-Heat storage tank inlet valve; 311-Cold storage tank outlet valve; 312-Cold storage tank inlet valve. Detailed Implementation

[0028] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Example 1:

[0032] like Figure 1As shown, the compressed air energy storage and power generation system with dehydration provided in this embodiment includes a gas storage subsystem, an energy release subsystem, a cold and heat storage subsystem, and a controller. The gas storage subsystem absorbs and compresses air from nature into a high-density, high-pressure effective resource for storage. The cold and heat storage subsystem provides a cold or heat source for the system. The energy release subsystem converts the aforementioned high-density, high-pressure effective resource into electrical energy. The controller controls the stable operation of the compressed air energy storage and power generation system with dehydration under certain conditions. For ease of description, the compressed air used in the energy release subsystem is referred to as the working fluid.

[0033] The energy release subsystem includes a dehydration device, a reheating device, and an expansion power generation device. The working fluid extracted from the gas storage device 130 is dehydrated by the dehydration device, then heated by the reheating device, and finally enters the expansion power generation device to generate electricity. The dehydration device includes a first expander 211 and a first separator 212. The working fluid after passing through the first expander 211 contains liquid and gaseous working fluid. The liquid working fluid is separated out by the first separator 212, and the gaseous working fluid flows out of the outlet of the first separator 212 and into the reheating device for heating. A first temperature monitoring device 214 is installed at the outlet of the first expander 211. After the working fluid expands through the first expander 211, its temperature decreases, converting some of the saturated water in the working fluid into free water, lowering the water dew point of the compressed air working fluid. The free water is separated by the first separator 212, and the gaseous working fluid flows out of the outlet of the first separator 212 and into the reheating device for heating. The outlet of the first expander 211 is equipped with a first temperature monitoring device 214, which is used to detect the outlet temperature of the first expander 211.

[0034] The expansion power generation device includes a second expander 231, which is used for expansion power generation. The second expander 231 is connected to a generator 233. Multiple second expanders 231 can be connected in series to increase the power generation capacity. When multiple second expanders 231 are connected in series, a generator 233 can be connected to each stage, or a generator 233 can be connected to the last stage. The expansion power generation device may also include a gearbox, with the output shaft of the second expander 231 connected to the input shaft of the gearbox, and the output shaft of the gearbox driving the generator.

[0035] A second temperature monitoring device 232 is installed at the outlet of the second expander 231 to detect the outlet temperature of the second expander 231. After the working fluid expands through the first expander 211, its temperature decreases, converting some of the saturated water in the working fluid into free water, thus lowering the water dew point of the compressed air working fluid. The working fluid is then reheated in the reheating device, and the temperature of the reheated working fluid is always higher than the temperature after the first expander 211, i.e., above the water dew point. Therefore, the working fluid exists in gaseous form in the reheating device. The expansion power generation device includes the second expander 231. After the gaseous working fluid is reheated, it experiences a second temperature drop after passing through the second expander 231. A second temperature monitoring device 232 is installed at the outlet of the second expander 231. When the temperature of the first temperature monitoring device 214 is lower than the temperature of the second temperature monitoring device 232, the water dew point of the working fluid is always controlled at the outlet temperature of the first expander 211. Therefore, the working fluid is also in a gaseous state at the outlet of the expansion power generation device.

[0036] The compressed air energy storage and power generation system including dehydration includes a controller. The controller controls the temperature of the first temperature monitoring device 214 to be lower than the temperature of the second temperature monitoring device 232; when the temperature of the first temperature monitoring device 214 is higher than or equal to the temperature of the second temperature monitoring device 232, the controller adjusts the reheating device until the temperature of the first temperature monitoring device 214 is lower than the temperature of the second temperature monitoring device 232. In other words, the water dew point temperature of the working fluid is maintained at the working fluid temperature after the first expander throughout the entire process.

[0037] Based on this, by setting up a dehydration device, the water dew point temperature of the working fluid in the entire system is controlled. The temperature of the working fluid in the subsequent process is controlled by the controller to keep it always higher than the water dew point temperature adjusted by the dehydration device, so that the working fluid (i.e., compressed air) is always in a gaseous state throughout the entire operation, thereby improving the efficiency and safety of the system.

[0038] Furthermore, the controller controls the temperature of the first temperature monitoring device to be at least 5 degrees Celsius lower than the temperature of the second temperature monitoring device. That is, the temperature of the first temperature monitoring device is 5 degrees Celsius or more lower than the temperature of the second temperature monitoring device.

[0039] Furthermore, the dehydration device also includes a second separator 213, the outlet of which is connected to the inlet of the first expander; the inlet of the second separator 213 is connected to the working fluid collected from the gas storage device 130. When the working fluid collected from the gas storage device 130 contains both free water (liquid water) and saturated water (gaseous water), the second separator 213 first separates the free water (liquid water) from the working fluid collected from the gas storage device.

[0040] Furthermore, the reheating device includes a first compressor 221, the inlet of which is connected to the outlet of the first separator 212; the outlet of the first compressor 221 is connected to the inlet of the second expander 231; and the input shaft of the first compressor 221 is connected to the output shaft of the first expander. After the working fluid passes through the first compressor 221, its temperature rises, and the first compressor 221 can be driven by the output shaft of the first expander, thus recovering and utilizing the expansion work of the first compressor 221.

[0041] Furthermore, the reheating device also includes a first heat exchanger 222. The cold inlet of the first heat exchanger 222 is connected to the outlet gas of the first separator 212, and the cold outlet of the first heat exchanger 222 is connected to the inlet of the second expander 231. The dehydrated working fluid can also be reheated through the first heat exchanger 222. The cold path of the first heat exchanger 222 refers to the low-temperature circuit of the first heat exchanger, and the hot path of the first heat exchanger 222 refers to the high-temperature circuit of the first heat exchanger. The working fluid exiting the outlet gas of the first separator 212 is the dehydrated low-temperature working fluid, which is heated through the low-temperature inlet of the first heat exchanger 222 and through the high-temperature circuit of the first heat exchanger 222. The heat of the hot path of the first heat exchanger 222 is provided by an external heat source, which can be a thermal power plant, boiler, industrial and urban waste heat, nuclear energy, geothermal energy, etc.

[0042] In this embodiment, preferably, the first heat exchanger 222 is an air-temperature vaporizer, which uses the temperature of the air to reheat the dehydrated gaseous working fluid.

[0043] Furthermore, the rewarming device also includes a second heat exchanger 223. The cold inlet of the second heat exchanger 223 is connected to the outlet gas of the first separator 212, and the cold outlet of the second heat exchanger 223 is connected to the inlet of the second expander 231. The heat in the hot path of the second heat exchanger 223 is provided by a cold and heat storage subsystem. Similarly, the cold path of the second heat exchanger 223 refers to the low-temperature circuit of the heat exchanger, and the hot path of the second heat exchanger 223 refers to the high-temperature circuit of the heat exchanger. The working fluid exiting the outlet gas of the first separator 212 is a dehydrated low-temperature working fluid, which is heated by the cold circuit of the second heat exchanger 223 and the high-temperature circuit of the second heat exchanger 223. The heat in the hot path of the second heat exchanger 223 is provided by a cold and heat storage subsystem.

[0044] Preferably, both the first separator 212 and the second separator 213 are cyclone separators. Cyclone separators utilize the centrifugal force of liquids to separate droplets, and are effective and inexpensive in gas-liquid separation.

[0045] Preferably, both the first separator 212 and the second separator 213 have sewage outlets, which discharge into sewage pipes and sewage tanks for further sewage treatment before discharge, or the sewage is recycled and reused.

[0046] Furthermore, the working gas exiting the dehydration device is divided into two paths in the reheating device. The first path enters the first compressor 221 through the first valve 225. The other path passes sequentially through the second valve 226, the first heat exchanger 222, and the third valve 227 before entering the first compressor 221. The third valve 227 is used to prevent backflow of the working gas. Either path can be used, or both can be used simultaneously. Because the working gas is reheated in the reheating device, it expands. If the inlet pressure of the first compressor is too high, it will affect the normal operation of the compressor. Therefore, a pressure sensor is installed on the inlet pipe of the first compressor.

[0047] If the pressure of pressure sensor 228 is higher than the preset value, then the first valve 225 is opened, and the second valve 226 and the third valve 227 are closed, allowing the working fluid to enter the first compressor 221 through the first path. If the pressure of pressure sensor 228 is lower than or equal to the preset value, then the second valve 226 and the third valve 227 are opened, and the first valve 225 is closed, allowing the working fluid to pass through the first heat exchanger before entering the first compressor 221. This ensures both the rewarming effect and the operating compression ratio of the first compressor, guaranteeing its safe, stable, and efficient operation. Alternatively, if the pressure of pressure sensor 228 is lower than or equal to the preset value, the first valve 225, the second valve 226, and the third valve 227 can be opened simultaneously, and the rewarming temperature of the working fluid can be adjusted by regulating the opening degree of these valves. The preset values ​​are determined according to the compressor model.

[0048] If the compressor inlet pressure is higher than the set value, the gas working fluid bypasses the first heat exchanger 222 and the third valve 227, directly entering the first compressor 221, i.e., closing the second valve 226 and the third valve 227. If the compressor inlet pressure is lower than the set value, it is necessary to choose whether to allow the gas to pass through the first compressor only, through the second valve 226 and then through the first compressor, or through both. Passing through both results in the largest rewarming amount. The above set value represents the maximum compressor inlet pressure required to ensure the compressor's compression ratio is set.

[0049] Furthermore, the cold and heat storage subsystem includes a cold storage tank 310 and a heat storage tank 320; the thermal inlet of the second heat exchanger 223 is connected to the outlet of the heat storage tank 320; the thermal outlet of the second heat exchanger 223 is connected to the inlet of the cold storage tank 310. The cold storage tank 310 is used to store the low-temperature circulating medium, and the heat storage tank 320 is used to store the high-temperature circulating medium. The second heat exchanger 223 is used to heat the dehydrated gaseous working medium. The outlet of the heat storage tank 320 is connected to the thermal inlet of the second heat exchanger 223 to provide heat to the gaseous working medium. The high-temperature circulating medium becomes a low-temperature circulating medium after passing through the thermal path of the second heat exchanger 223 and is stored in the cold storage tank 310. The circulating medium in this embodiment can use the circulating medium of commonly used heat exchangers, such as water or antifreeze. Furthermore, the gas storage subsystem includes an energy storage compressor unit, a third heat exchanger 140, and a gas storage device 130. To compress natural air into a high-density, high-pressure effective resource, existing technologies typically use two or more compressors connected in series to form the energy storage compressor unit. In this embodiment, the energy storage compressor unit includes at least one second compressor 111. The second compressor 111 compresses natural air into compressed air. This at least one second compressor 111 can compress the air source into a high-density, high-pressure effective resource, making it suitable for large-scale compressed air energy storage systems and capable of storing and generating more electrical energy. The second compressor 111 is powered by an electric motor 120, whose power can originate from wind and solar power curtailment.

[0050] The outlet of the energy storage compressor unit is the outlet of the last stage second compressor 111. The hot inlet of the third heat exchanger 140 is connected to the outlet of the energy storage compressor unit, and the hot outlet of the third heat exchanger 140 is connected to the inlet of the gas storage device. The cold inlet of the third heat exchanger 140 is connected to the outlet of the cold storage tank 310, and the cold outlet of the third heat exchanger 140 is connected to the inlet of the heat storage tank 320. When the air source is compressed into high-density, high-pressure compressed air by the energy storage compressor unit, a large amount of heat is generated. In this embodiment, the third heat exchanger is used to cool the compressed air at the outlet of the energy storage compressor unit and stores the heat of the compressed air in the heat storage tank 320 for use by the second heat exchanger 223 of the rewarming system.

[0051] The gas storage device 130 has a gas storage inlet valve 131 and a gas storage outlet valve 132 at its inlet to adjust the flow rate of compressed air entering and leaving the gas storage device, thereby ensuring stable pressure within the gas storage device.

[0052] Furthermore, a cold water pump 330 is installed on the outlet pipe of the cold storage tank 310, and a hot water pump 340 is installed on the outlet pipe of the heat storage tank 320; both the cold water pump 330 and the hot water pump 340 are frequency-controlled pumps, and the controller also has the function of controlling the opening degree and flow rate of the cold water pump 330 and the hot water pump 340, thereby controlling the heat exchange, and thus controlling the temperature of the substances in the heat storage tank 320 and the cold storage tank 310, controlling the heat exchange of the second heat exchanger 223, and controlling the reheating temperature of the reheating device.

[0053] The compressed air energy storage and power generation system with dehydration in this embodiment also includes a controller, which has at least the following main functions:

[0054] Energy storage stage: The controller controls the frequency and start / stop of the energy storage compressor unit 110, thereby controlling the compressed air production rate. It controls the cold storage tank outlet valve 311, the cold water pump 330, and the heat storage tank inlet valve 322, thereby controlling the heat exchange capacity of the third heat exchanger 140.

[0055] Energy release stage: The energy release stage in this embodiment includes the dehydration process, the reheating process, and the expansion power generation process.

[0056] Dehydration process: The controller controls the start and stop of the first expander 211, the first separator 212, and the second separator 213 and their parameters.

[0057] Reheating process: If the pressure of pressure sensor 228 is higher than the preset value, then the first valve 225 is opened and the second valve 226 and the third valve 227 are closed, so that the working fluid enters the first compressor 221 from the first path; if the pressure of pressure sensor 228 is lower than or equal to the preset value, then the second valve 226 and the third valve 227 are opened and the first valve 225 is closed, so that the working fluid passes through the first heat exchanger before entering the first compressor 221.

[0058] The controller controls the heat exchange capacity of the second heat exchanger by controlling the opening degree of the heat storage tank outlet valve 321, the cold storage tank inlet valve 312, and the outlet pressure of the hot water pump 340.

[0059] Energy release process: The controller controls the temperature of the first temperature monitoring device 214 to be lower than the temperature of the second temperature monitoring device 232 (preferably, the temperature of the first temperature monitoring device is at least 5 degrees Celsius lower than the temperature of the second temperature monitoring device); when the temperature of the first temperature monitoring device 214 is higher than or equal to the temperature of the second temperature monitoring device 232, the controller increases the temperature of the third temperature monitoring device 224, which can characterize the rewarming temperature of the working fluid after passing through the rewarming device. The controller adjusts the rewarming process as described above.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A compressed air energy storage and power generation system containing dehydrated components, characterized in that, Including the energy release subsystem and controller; The energy release subsystem includes a dehydration device, a reheating device, and an expansion power generation device; The working fluid extracted from the gas storage device is dehydrated by the dehydration device, then heated by the reheating device, and finally enters the expansion power generation device to generate electricity. The dehydration device includes a first expander and a first separator; the working fluid after passing through the first expander includes a liquid working fluid and a gaseous working fluid, the liquid working fluid is separated out by the first separator, and the gaseous working fluid flows out from the outlet of the first separator and flows into the reheating device for heating; the outlet of the first expander is equipped with a first temperature monitoring device. The rewarming device includes a first compressor, the air inlet of the first compressor is connected to the air outlet of the first separator, and the air outlet of the first compressor is connected to the air inlet of the second expander. The expansion power generation device includes a second expander, and a second temperature monitoring device is provided at the outlet of the second expander; The controller controls the temperature of the first temperature monitoring device to be lower than the temperature of the second temperature monitoring device; when the temperature of the first temperature monitoring device is higher than or equal to the temperature of the second temperature monitoring device, the controller adjusts the rewarming device until the temperature of the first temperature monitoring device is lower than the temperature of the second temperature monitoring device.

2. The compressed air energy storage and power generation system with dehydration according to claim 1, characterized in that, The dehydration device further includes a second separator, the outlet of which is connected to the inlet of the first expander; the working fluid extracted from the gas storage device is introduced into the inlet of the second separator.

3. The compressed air energy storage and power generation system with dehydration according to claim 1, characterized in that, The input shaft of the first compressor is connected to the output shaft of the first expander.

4. The compressed air energy storage and power generation system with dehydration according to claim 1, characterized in that, The rewarming device further includes a first heat exchanger, the cold inlet of which is connected to the outlet gas of the first separator, and the cold outlet of which is connected to the inlet of the second expander; the heat of the hot path of the first heat exchanger is provided by an external heat source.

5. The compressed air energy storage and power generation system with dehydration according to claim 4, characterized in that, The rewarming device also includes a first compressor; The working gas from the dehydration device is divided into two paths in the reheating device. The first path enters the first compressor through the first valve, and the second path enters the first compressor after passing through the second valve, the first heat exchanger, and the third valve in sequence. A pressure sensor is installed on the air inlet pipe of the first compressor, and the controller controls the opening degree of the second valve according to the pressure value of the pressure sensor.

6. The compressed air energy storage and power generation system with dehydration according to claim 1, characterized in that, The rewarming device also includes a second heat exchanger, the cold inlet of which is connected to the outlet gas of the first separator, and the cold outlet of which is connected to the inlet of the second expander; the heat of the hot path of the second heat exchanger is provided by a cold and heat storage subsystem.

7. The compressed air energy storage and power generation system with dehydration according to claim 6, characterized in that, The cold and heat storage subsystem includes a cold storage tank and a heat storage tank; The thermal inlet of the second heat exchanger is connected to the outlet of the heat storage tank; the thermal outlet of the second heat exchanger is connected to the inlet of the cold storage tank.

8. The compressed air energy storage and power generation system with dehydration according to claim 7, characterized in that, It also includes a gas storage subsystem, which includes an energy storage compressor unit, a third heat exchanger and the gas storage device, wherein the energy storage compressor unit includes at least one stage of a second compressor. The thermal inlet of the third heat exchanger is connected to the outlet of the energy storage compressor unit, and the thermal outlet of the third heat exchanger is connected to the inlet of the gas storage device.

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