Compressed air energy storage power generation system having purification function

Abstract

A compressed air energy storage power generation system having a purification function, comprising an energy release subsystem and a cold and heat storage subsystem. The energy release subsystem comprises a purification device and an expander generator set (232); the purification device comprises a sprayer (211), a spray tank (212), a rotary spray absorber (213), an absorption tank (214), and an absorption liquid heater (215). The cold and heat storage subsystem comprises a heat storage tank (310) and a cold storage tank (320), wherein the cold storage tank (320) is used for storing a low-temperature circulating medium, and the heat storage tank (310) is used for storing a high-temperature circulating medium.

Description

A compressed air energy storage and power generation system with purification

[0001] Related Technology Cross-references

[0002] This application claims priority to the Chinese patent application filed with the Patent Office of China on March 20, 2024, with application number 202410319882.1 and invention name “A compressed air energy storage and power generation system with purification”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of compressed air energy storage and power generation, and in particular to a compressed air energy storage and power generation system including purification. Background Art

[0004] Compressed air energy storage power generation technology uses compressed air energy storage technology (CAES) to store electricity during low periods and release it when needed, thereby achieving power generation and grid connection. It is a new energy power generation technology. When storing energy, a compressor unit is required to compress the air in nature into high-density, high-pressure compressed air and store the above-mentioned compressed air through an air storage system. When releasing energy, the stored compressed air is taken out through the expansion power generation system to generate electricity.

[0005] In the process of implementing this application, the inventors discovered that the prior art has at least the following problems:

[0006] The compressed air used for energy release contains various impurities. For example, if the compressor unit contains oil, the compressed air it produces will also contain oily substances, which can be further divided into large oil droplets, small oil droplets, and emulsified oil droplets. Acid ions, acidic or alkaline gases, and other gases may be introduced into compressed air storage devices. This phenomenon is particularly evident in underground gas storage. In addition, one of the byproducts of compressed air is free water, and the aforementioned acidic or alkaline gases are highly soluble in free water and exist in the form of ions. Solid particulate impurities such as dust, silt, rust, and rock salt particles may also be present in compressed air storage devices.

[0007] Compressed air containing these impurities can pose serious safety hazards during subsequent use, primarily in two ways. First, impurities can affect the normal operation of the power generation system. Currently, large-scale compressed air energy storage power generation systems have a design lifespan of 30-50 years. Achieving this 30-50-year lifespan requires frequent maintenance, especially for the expander, various pipelines, and equipment, which are complex and expensive to repair. Frequent maintenance or replacement will inevitably lead to a significant increase in the cost of using the compressed air energy storage power generation system, making it uncompetitive compared to other new energy power generation systems. Second, devices using compressed air are typically made of steel, and ordinary steel is highly susceptible to electrochemical corrosion in the presence of impurities and humid air. Since compressed air is typically used in medium- and high-pressure conditions, corrosion can lead to serious consequences such as steel plate fractures and gas leaks. Minor chemical corrosion can also be difficult to detect during maintenance. Existing compressed air purification systems have technical issues with poor compatibility with compressed air energy storage power generation systems, resulting in reduced system efficiency.

[0008] Based on this, how to provide a purified compressed air energy storage power generation system that can simultaneously remove oil, solid dust, free water and chemical impurities dissolved in the compressed air, and adapt to various types of impurities, and produce clean dry compressed gas after purification, thereby improving the operating efficiency of the power generation system, is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the Invention

[0009] The purpose of this application is to provide a compressed air energy storage and power generation system with purification, which can remove oil, solid dust, free water and chemical impurities dissolved in compressed air, thereby improving the service life, safety and stability of the compressed air energy storage and power generation system.

[0010] To achieve this purpose, on the one hand, a compressed air energy storage and power generation system with purification is provided, including an energy release subsystem and a cold storage and heat storage subsystem; the energy release subsystem includes a purification device and an expansion generator set, and the purification device includes a sprayer, a spray tank, a rotary spray absorber, an absorption tank and an absorption liquid heater; the impurity-containing compressed air enters from the sprayer, flows out of the sprayer and enters the rotary spray absorber, and flows out of the rotary spray absorber and enters the expansion generator set; the first liquid outlet of the spray tank is connected to the liquid inlet of the sprayer, the second liquid outlet of the spray tank is connected to the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is connected to the liquid inlet of the rotary spray absorber. The liquid inlet is connected; a first valve is provided on the first branch; the second liquid outlet of the spray tank is connected to the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch are jointly merged into the liquid inlet pipeline of the rotary spray absorber; a second valve is provided on the second branch; the cold circuit of the absorption liquid heater is located on the liquid inlet pipeline of the rotary spray absorber; the cold and heat storage subsystem includes a heat storage tank and a cold storage tank, the cold storage tank is used to store low-temperature circulating medium, and the heat storage tank is used to store high-temperature circulating medium; the hot circuit inlet of the absorption liquid heater is connected to the outlet of the heat storage tank through a first branch; the hot circuit outlet of the absorption liquid heater is connected to the inlet of the cold storage tank.

[0011] Optionally, a first separator is further provided between the sprayer and the rotary spray absorber; the compressed air flows out from the air outlet of the sprayer and enters the air inlet of the first separator, and then flows out from the air outlet of the first separator and enters the air inlet of the rotary spray absorber; the first separator is used to dry the compressed air.

[0012] Optionally, a slug flow catcher is further provided before the inlet of the sprayer; the compressed air to be purified enters the air inlet of the slug flow catcher, flows out from the air outlet of the slug flow catcher and then enters the air inlet of the sprayer.

[0013] Optionally, the spray tank is filled with water, and the absorption tank is filled with alkali or acid.

[0014] Optionally, the first separator is a cyclone separator or a blade separator.

[0015] Optionally, a first high-pressure pump is provided on the pipeline between the first liquid outlet of the spray tank and the liquid inlet of the sprayer; a low-pressure pump is provided on the first branch; and a second high-pressure pump is provided on the liquid inlet pipeline between the confluence point of the first branch and the second branch and the rotary spray absorber.

[0016] Optionally, a pH detection device is provided at the sewage outlet of the rotary jet absorber; a third valve is provided on the liquid inlet pipe of the rotary jet absorber, and the outlet of the third valve is located before the inlet of the second high-pressure pump; the first valve and the third valve are controlled to be opened while the second valve is closed by the pH detection device; or the second valve is controlled to be opened while the first valve and the third valve are closed by the pH detection device; and / or the outlet pressure of the low-pressure pump and the second high-pressure pump is controlled by the pH detection device.

[0017] Optionally, the expansion generator set also includes an expansion heat exchanger and at least one stage expansion unit; all the expansion units are connected in series; the cold circuit inlet of the expansion heat exchanger is connected to the air outlet of the expander, and the cold circuit outlet of the expansion heat exchanger is connected to the inlet of the next stage expander; the hot circuit inlet of the expansion heat exchanger is connected to the outlet of the heat storage tank through a second branch; the hot circuit outlet of the expansion heat exchanger is connected to the inlet of the cold storage tank.

[0018] Optionally, it also includes a gas storage subsystem, which also includes a gas storage reservoir, a compression heat recovery heat exchanger and at least one stage of compressor unit; all of the compressor units are connected in series; the external air source passes through all of the compressor units and then passes through the hot path of the compression heat recovery heat exchanger before entering the gas storage reservoir; the cold path inlet of the compression heat recovery heat exchanger is connected to the outlet of the cold storage tank, and the cold path outlet of the compression heat recovery heat exchanger is connected to the inlet of the heat storage tank.

[0019] One of the above technical solutions has the following beneficial effects:

[0020] The compressed air energy storage power generation system with purification includes an energy release subsystem and a cold and heat storage subsystem; the energy release subsystem uses compressed air to generate electricity, and the cold and heat storage subsystem is used to provide heat and cooling for the compressed air energy storage power generation system with purification and to recover heat and cooling of the system.

[0021] The energy release subsystem includes a purification device, which includes a sprayer, a spray tank, a rotary spray absorber, an absorption tank and an absorption liquid heater; the first liquid outlet of the spray tank is connected to the liquid inlet of the sprayer, the second liquid outlet of the spray tank is connected to the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is connected to the liquid inlet of the rotary spray absorber; a first valve is provided on the first branch; the second liquid outlet of the spray tank is connected to the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch are jointly merged into the liquid inlet pipeline of the rotary spray absorber; a second valve is provided on the second branch.

[0022] The spray tank is used to store the spray liquid provided to the sprayer. Compressed air containing impurities enters the sprayer through the air inlet and flows out through the air outlet. The compressed air passing through the sprayer removes oil droplets and dust from impurities and reduces the concentration of total dissolved solids in the free water carried by the compressed air.

[0023] The absorption tank is used to store the absorption liquid supplied to the rotary jet absorber. Compressed air containing impurities flows out of the sprayer's air outlet and enters the absorber's air inlet. The compressed air flowing out of the sprayer's air outlet enters the absorber tangentially, creating a cyclonic flow field within the absorber. The compressed air to be purified enters through the air inlet and is subjected to centrifugal force. Simultaneously, the working fluid is sprayed radially from the side and atomized by the impact of the compressed air to be purified, forming countless absorption droplets. These droplets absorb and react with the free water containing chemical impurities in the compressed air to be purified. Due to the cyclonic flow field formed within the absorber, the purified compressed air is dry and discharged through the absorber's central exhaust pipe. The reacted absorption droplets are then discharged through the absorber's waste outlet. Therefore, the absorber removes free water and acid and base ions from the compressed air. Purified compressed air flows out of the absorber's air outlet and enters the expansion generator set to generate electricity. Since the compressed air coming out of the gas storage system passes through the above-mentioned purification device to remove oil, solids, free water and chemical impurities before entering the expansion generator set, the compressed air flowing into the expansion generator set is clean and dry compressed air, thereby improving the efficiency, service life, safety and stability of the system.

[0024] The second liquid outlet of the spray tank is connected to the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is connected to the liquid inlet of the rotary spray absorber; a first valve is provided on the first branch, and the first valve is used to control the opening of the first branch. The second liquid outlet of the spray tank is connected to the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch are jointly merged into the liquid inlet pipeline of the rotary spray absorber; a second valve is provided on the second branch, and the second valve is used to control the opening of the second branch. When the first valve is opened, the spray tank is connected to the absorption tank, and the working fluid in the spray tank enters the absorption tank. The components of the working fluid in the absorption tank can be adjusted, thereby adjusting the components of the absorption liquid entering the rotary spray absorber. When the second valve is opened, the spray tank is directly connected to the rotary spray absorber, and the working fluid in the spray tank enters the rotary spray absorber. The above technical solution can choose whether to use the working fluid in the spray tank to enter the rotary jet absorber, or to use the mixed working fluid in the spray tank and the absorption tank to enter the rotary jet absorber according to the impurity components of the unpurified compressed air flowing out of the gas storage system. By adjusting the opening of the first valve, the concentration ratio of the above mixed working fluid can also be adjusted.

[0025] To improve the absorption efficiency of the rotary jet absorber, an absorption liquid heater is installed on the liquid inlet line. The cold and heat storage subsystem consists of a cold storage tank for storing low-temperature circulating medium and a heat storage tank for storing high-temperature circulating medium. The absorption liquid heater's hot circuit inlet is connected to the heat storage tank, which provides heat for the absorption liquid heater. The absorption liquid heater's hot circuit outlet is connected to the cold storage tank's inlet, allowing the cooled high-temperature circulating medium to be converted to low-temperature circulating medium and stored in the cold storage tank.

[0026] Based on this, the compressed air energy storage power generation system with purification purifies the compressed air coming out of the gas storage system through a purification device before entering the expansion generator set. This can remove oil, solid dust, free water and chemical impurities dissolved in the compressed air, thereby improving the service life, safety and stability of the compressed air energy storage power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a flow chart of the first embodiment.

[0028] In the figure: 110-compressor unit; 120-gas storage; 121-gas storage inlet valve; 122-gas storage outlet valve; 130-compression heat recovery heat exchanger; 211-sprayer; 212-spray tank; 213-rotary spray absorber; 214-absorption tank; 215-absorption liquid heater; 216-first valve; 217-second valve; 218-third valve; 219-first separator; 220-slug flow catcher; 221-first high-pressure pump; 222-low-pressure Pump; 223-second high-pressure pump; 224-PH detection device; 232-expansion generator set; 231-expansion heat exchanger; 310-heat storage tank; 320-cold storage tank; 311-first hot water pump; 312-first heat storage tank outlet valve; 313-first cold storage tank inlet valve; 314-second hot water pump; 315-second heat storage tank outlet valve; 316-second cold storage tank inlet valve; 317-cold storage tank outlet valve; 318-cold water pump; 319-heat storage tank inlet valve. DETAILED DESCRIPTION

[0029] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0030] In the description of this application, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] Example 1:

[0033] As shown in Figure 1, this embodiment provides a purified compressed air energy storage and power generation system, including a gas storage subsystem, an energy release subsystem, and a cold and heat storage subsystem. The gas storage subsystem absorbs and compresses natural air into a high-density, high-pressure, and effective resource for storage. The cold and heat storage subsystem provides a cooling or heating source for the system. The energy release subsystem converts this high-density, high-pressure effective resource into electrical energy.

[0034] The energy release subsystem includes a purification device, which includes a sprayer 211, a spray tank 212, a rotary spray absorber 213, an absorption tank 214 and an absorption liquid heater 215; the first liquid outlet of the spray tank 212 is connected to the liquid inlet of the sprayer 211, the second liquid outlet of the spray tank 212 is connected to the liquid inlet of the absorption tank 214 through a first branch, and the liquid outlet of the absorption tank 214 is connected to the liquid inlet of the rotary spray absorber 213; a first valve 216 is provided on the first branch; the second liquid outlet of the spray tank 212 is connected to the liquid inlet of the rotary spray absorber 213 through a second branch, and the first branch and the second branch are jointly merged into the liquid inlet pipeline of the rotary spray absorber 213; a second valve 217 is provided on the second branch.

[0035] The spray tank 212 is used to store the spray liquid provided to the sprayer 211. Compressed air containing impurities enters the air inlet of the sprayer 211 and flows out of the air outlet of the sprayer 211. The compressed air passing through the sprayer 211 can remove oil droplets and dust from impurities and reduce the concentration of total dissolved solids in the free water carried by the compressed air.

[0036] The absorption tank 214 is used to store the absorption liquid provided to the rotary spray absorber 213. The compressed air containing impurities flows out from the air outlet of the sprayer 211 and enters the air inlet of the rotary spray absorber 213. The compressed air flowing out from the air outlet of the sprayer 211 enters the rotary spray absorber 213. A cyclonic flow field is formed inside the rotary spray absorber 213. The compressed air to be purified enters from the air inlet and is subjected to centrifugal force. At the same time, the working fluid is radially sprayed in from the side and is atomized by the impact of the compressed air to be purified, forming countless working fluid droplets for absorption. The working fluid droplets react with the free water containing chemical impurities in the compressed air to be purified. Since a cyclonic flow field can be formed inside the rotary spray absorber 213, the purified compressed air is dry compressed air and is discharged from the central exhaust pipe of the rotary spray absorber 213. The absorbed liquid droplets after the reaction are discharged from the sewage outlet of the rotary spray absorber 213. Therefore, the rotary jet absorber can remove free water and acid-base ions from the compressed air. The purified compressed air flowing out of the outlet of the rotary jet absorber 213 enters the expansion generator set 232 to generate electricity. Because the compressed air from the gas storage system passes through the aforementioned purification device to remove oil, solid dust, free water, and chemical impurities before entering the expansion generator set 232, the compressed air entering the expansion generator set 232 is clean and dry, thereby improving the efficiency, service life, safety, and stability of the system.

[0037] The second liquid outlet of the spray tank 212 is connected to the liquid inlet of the absorption tank 214 via a first branch, and the liquid outlet of the absorption tank 214 is connected to the liquid inlet of the rotary spray absorber 213. A first valve 216 is provided on the first branch, and the first valve 216 is used to control the opening of the first branch. The second liquid outlet of the spray tank 212 is connected to the liquid inlet of the rotary spray absorber 213 via a second branch, and the first branch and the second branch are combined into the liquid inlet pipeline of the rotary spray absorber 213. A second valve 217 is provided on the second branch, and the second valve 217 is used to control the opening of the second branch. When the first valve 216 is opened, the spray tank 212 is connected to the absorption tank 214, and the working fluid in the spray tank 212 enters the absorption tank 214. The components of the working fluid in the absorption tank 214 can be adjusted, thereby adjusting the components of the absorption liquid entering the rotary spray absorber 213. Open the second valve 217, the spray tank 212 is directly connected to the rotary spray absorber 213, and the working medium in the spray tank 212 enters the rotary spray absorber 213. Acid ions and / or alkali may be present in the compressed air to be purified at the same time, and both are easily soluble in free water. The solution after being dissolved in free water is either acidic or alkaline as a whole, and in a few cases it may be neutral. The chemical properties of the compressed air to be purified can be judged before entering the purification device. In this embodiment, the impurity components of the unpurified compressed air flowing out of the air storage system can be used to select whether to use the working medium in the spray tank 212 to enter the rotary spray absorber 213, or to use the mixed working medium in the spray tank 212 and the absorption tank 214 to enter the rotary spray absorber 213. By adjusting the valve opening of the first valve 216, the concentration ratio of the above-mentioned mixed working medium can also be adjusted.

[0038] In order to improve the absorption efficiency of the rotary spray absorber 213, an absorption liquid heater 215 is provided on the liquid inlet pipeline of the rotary spray absorber 213. The cold storage and heat storage subsystem includes a heat storage tank 310. The heat path inlet of the absorption liquid heater 215 is connected to the heat storage tank 310. The heat storage tank is used to store high-temperature circulating medium. The high-temperature circulating medium refers to a circulating medium with a high temperature. The heat storage tank 310 provides heat for the absorption liquid heater 215. The cold storage and heat storage subsystem also includes a cold storage tank 320. The cold storage tank is used to store low-temperature circulating medium. The heat path outlet of the absorption liquid heater 215 is connected to the inlet of the cold storage tank 320. The cooled high-temperature circulating medium becomes a low-temperature circulating medium and is stored in the cold storage tank. The circulating medium of this embodiment can use the circulating medium of a commonly used heat exchanger, such as water or antifreeze.

[0039] Therefore, the compressed air energy storage and power generation system with purification in this embodiment purifies the compressed air coming out of the air storage system through a purification device before entering the expansion generator set 232, which can remove oil, solid dust, free water and chemical impurities dissolved in the compressed air, thereby improving the service life, safety and stability of the compressed air energy storage and power generation system.

[0040] Optionally, the spray tank 212 contains water, and the absorption tank 214 contains an alkali or acid. Optionally, the spray tank 212 contains one of demineralized water, purified water, or distilled water. The spray tank 212 and the absorption tank 214 are connected via a first branch line. A first valve 216 is provided on the first branch line. Adjusting the opening of the first valve 216 adjusts the concentration of the acid solution or alkaline solution in the absorption tank 214.

[0041] Optionally, a first separator 219 is further provided between the sprayer 211 and the rotary spray absorber 213; the compressed air flows out from the air outlet of the sprayer 211 and enters the air inlet of the first separator 219, and then flows out from the air outlet of the first separator 219 and enters the air inlet of the rotary spray absorber 213; the first separator 219 is used to dry the compressed air.

[0042] The compressed air after spraying will introduce excess spray liquid. The first separator 219 then separates the liquid droplets and solid impurities carried by the compressed air, further reducing the total dissolved solids in the liquid carried by the compressed air. If the working fluid in the spray tank 212 is water, the compressed air after spraying will also introduce water. The separator then further separates the free water in the compressed air, further reducing the total dissolved solids in the liquid carried by the compressed air.

[0043] Optionally, a slug flow catcher 220 is also provided before the inlet of the sprayer 211; the compressed air to be purified from the gas storage reservoir 120 enters the air inlet of the slug flow catcher 220, flows out from the air outlet of the slug flow catcher 220, and then enters the air inlet of the sprayer 211. When the raw gas passes through the undulating pipeline, the free water it carries will accumulate at the bottom of the pipeline. After reaching a certain volume, slug flow will appear in the pipeline. Therefore, the raw gas first passes into the slug flow catcher 220 to receive the slug flow that may appear before the compressed air to be purified enters the purification process and separates the slug flow carried by the raw gas. The function of the slug flow catcher 220 is to eliminate slug flow, provide stable transportation for the downstream, and preliminarily separate a portion of large oil particles in the raw gas. Furthermore, the slug flow catcher 220 can be of container type or pipeline type, selected according to the site conditions.

[0044] Optionally, the first separator 219 may be a cyclone separator or a vane separator; and / or, the first separator 219 may be a cyclone separator or a vane separator, the selection of which is based on the operating conditions. If the compressed air operating conditions are stable, such as when the flow rate and pressure are stable, a cyclone separator may be used; if the compressed air operating conditions have a wide range of flexibility, a vane separator may be used.

[0045] Optionally, a first high-pressure pump 221 is provided on the pipeline between the first liquid outlet of the spray tank 212 and the liquid inlet of the sprayer 211. Since the compressed air entering the sprayer to be sprayed is of medium and high pressure, a high-pressure pump is used when the spray working medium is introduced into the sprayer. By adjusting the outlet pressure of the first high-pressure pump 221, the amount of working liquid entering the sprayer 211 from the spray tank 212 is regulated. A low-pressure pump 222 is provided on the first branch between the second liquid outlet of the spray tank 212 and the liquid inlet of the absorption tank 214. By opening the first valve 216 and adjusting the outlet pressure of the low-pressure pump 222, the amount of working liquid entering the absorption tank 214 from the spray tank 212 is regulated, thereby adjusting the acid / alkali concentration of the working liquid in the absorption tank 214, and then adjusting the acid / alkali concentration of the working liquid entering the rotary spray absorber 213. A second high-pressure pump 223 is installed on the liquid inlet pipeline between the confluence of the first and second branches and the rotary jet absorber 213. Because the compressed air entering the rotary jet absorber for absorption is of medium to high pressure, this high-pressure pump is used to introduce the absorption medium into the rotary jet absorber. The purification effect of the rotary jet absorber 213 is controlled by adjusting the concentration of the acid / alkaline working medium in the absorption tank 214 and the outlet pressure of the second high-pressure pump 223.

[0046] Optionally, a pH detection device 224 is provided at the sewage outlet of the rotary spray absorber 213 for detecting the pH value of the sewage discharged from the rotary spray absorber 213, and controlling the opening of the following valves and the outlet pressure of the pump by the pH value. A third valve 218 is provided on the liquid inlet pipeline of the rotary spray absorber 213, and the outlet of the third valve 218 is located before the inlet of the second high-pressure pump 223. If the pH detection device 224 detects that the pH of the sewage outlet of the rotary spray absorber 213 is neutral, then the pH detection device 224 controls the second valve 217 to open, and at the same time, the first valve 216 and the third valve 218 are closed. At this time, the spray liquid enters the rotary spray absorber 213, that is, the working fluid entering the sprayer 211 and the rotary spray absorber 213 all comes from the spray tank 212. If the pH detection device 224 detects that the pH at the outlet of the rotary jet absorber 213 is acidic or alkaline, the pH detection device 224 controls the first valve 216 and the third valve 218 to open, while the second valve 217 is closed, thereby adjusting the component concentration of the working fluid in the absorption tank 214. The pH detection device 224 can also control the outlet pressure of the low-pressure pump 222 and the second high-pressure pump 223. The outlet pressure of the low-pressure pump 222 and the second high-pressure pump 223 is adjusted according to the pH detected by the pH detection device 224, thereby adjusting the acid / alkaline concentration of the working fluid in the absorption tank 214.

[0047] Optionally, the expansion generator set 232 further includes an expansion heat exchanger 231 and at least one expansion unit, with all expansion units connected in series. The cold circuit inlet of the expansion heat exchanger 231 is connected to the air outlet of the expander, and the cold circuit outlet of the expansion heat exchanger 231 is connected to the inlet of the next-stage expander. The hot circuit inlet of the expansion heat exchanger 231 is connected to the second outlet of the thermal storage tank 310, and the hot circuit outlet of the expansion heat exchanger 231 is connected to the inlet of the cold storage tank 320. The expansion heat exchanger 231 is used to recover the cold energy generated by the expansion.

[0048] Optionally, a gas storage subsystem is also included, comprising a gas storage reservoir 120, a compression heat recovery heat exchanger 130, and at least one compressor unit 110; all compressor units are connected in series. After entering the compressor unit 110, air from the outside source passes through the hot circuit of the compression heat recovery heat exchanger 130 before entering the gas storage reservoir 120. The cold circuit inlet of the compression heat recovery heat exchanger 130 is connected to the outlet of the cold storage tank 320, while the cold circuit outlet of the compression heat recovery heat exchanger 130 is connected to the inlet of the thermal storage tank 310. The compression heat recovery heat exchanger 130 is used to recover the heat energy generated by the compressor unit 110.

[0049] Optionally, in the gas storage subsystem, a gas storage inlet valve 121 is provided on the pipeline from the compressor unit into the gas storage; in the expansion power generation subsystem, a gas storage outlet valve 122 is provided on the pipeline outflowing from the gas storage.

[0050] Optionally, the thermal storage tank 310 provides heat to both the absorption liquid heater 215 and the expansion heat exchanger 231. The thermal storage tank 310 is connected to the absorption liquid heater 215's hot circuit via a first branch line and flows into the cold storage tank 320. The first branch line includes a first hot water pump 311, a first thermal storage tank outlet valve 312, and a first cold storage tank inlet valve 313. The thermal storage tank 310 is connected to the expansion heat exchanger 231's hot circuit via a first branch line and flows into the cold storage tank 320. The second branch line includes a second hot water pump 314, a second thermal storage tank outlet valve 315, and a second cold storage tank inlet valve 316. A cold storage tank outlet valve 317 and a cold water pump 318 are located between the cold circuit inlet of the compression heat recovery heat exchanger 130 and the cold storage tank 320. A thermal storage tank inlet valve 319 is located between the cold circuit outlet of the compression heat recovery heat exchanger 130 and the thermal storage tank 310.

[0051] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the claims of the present application.

Claims

1. A compressed air energy storage power generation system with purification, characterized in that: Including energy release subsystem and cold and heat storage subsystem; The energy release subsystem includes a purification device and an expansion generator set, and the purification device includes a sprayer, a spray tank, a rotary spray absorber, an absorption tank and an absorption liquid heater; the impurity-containing compressed air enters from the sprayer, flows out of the sprayer and enters the rotary spray absorber, and flows out of the rotary spray absorber and enters the expansion generator set; the first liquid outlet of the spray tank is connected to the liquid inlet of the sprayer, the second liquid outlet of the spray tank is connected to the liquid inlet of the absorption tank through a first branch, and the liquid outlet of the absorption tank is connected to the liquid inlet of the rotary spray absorber; a first valve is provided on the first branch; the second liquid outlet of the spray tank is connected to the liquid inlet of the rotary spray absorber through a second branch, and the first branch and the second branch are jointly merged into the liquid inlet pipeline of the rotary spray absorber; a second valve is provided on the second branch; the cold circuit of the absorption liquid heater is located on the liquid inlet pipeline of the rotary spray absorber; The cold and heat storage subsystem includes a heat storage tank and a cold storage tank, the cold storage tank is used to store low-temperature circulating medium, and the heat storage tank is used to store high-temperature circulating medium; the heat path inlet of the absorption liquid heater is connected to the outlet of the heat storage tank through a first branch; the heat path outlet of the absorption liquid heater is connected to the inlet of the cold storage tank.

2. The purified compressed air energy storage power generation system according to claim 1, characterized in that: A first separator is further provided between the sprayer and the rotary spray absorber; The compressed air flows out of the air outlet of the sprayer and enters the air inlet of the first separator, and then flows out of the air outlet of the first separator and enters the air inlet of the rotary spray absorber; The first separator is used to dry the compressed air.

3. The purified compressed air energy storage power generation system according to claim 1, characterized in that: A slug flow catcher is also provided before the inlet of the sprayer; The compressed air to be purified enters the air inlet of the slug flow catcher, flows out from the air outlet of the slug flow catcher, and then enters the air inlet of the sprayer.

4. The purified compressed air energy storage power generation system according to claim 1, characterized in that: The spray tank is filled with water, and the absorption tank is filled with alkali or acid.

5. The purified compressed air energy storage power generation system according to claim 2, characterized in that: The first separator is a cyclone separator or a blade separator.

6. The purified compressed air energy storage power generation system according to claim 1, characterized in that: A first high-pressure pump is provided on the pipeline between the first liquid outlet of the spray tank and the liquid inlet of the sprayer; a low-pressure pump is provided on the first branch; and a second high-pressure pump is provided on the liquid inlet pipeline between the confluence point of the first branch and the second branch and the rotary spray absorber.

7. The purified compressed air energy storage power generation system according to claim 6, characterized in that: A pH detection device is provided at the sewage outlet of the rotary spray absorber; a third valve is provided on the liquid inlet pipeline of the rotary spray absorber, and the outlet of the third valve is located before the inlet of the second high-pressure pump; The pH detection device is used to control the first valve and the third valve to be opened while the second valve is closed; or the pH detection device is used to control the second valve to be opened while the first valve and the third valve are closed; And / or, the outlet pressures of the low-pressure pump and the second high-pressure pump are controlled by the pH detection device.

8. The purified compressed air energy storage power generation system according to claim 1, characterized in that: The expansion generator set further comprises an expansion heat exchanger and at least one stage expansion unit; all the expansion units are connected in series; The cold circuit inlet of the expansion heat exchanger is connected to the air outlet of the expander, and the cold circuit outlet of the expansion heat exchanger is connected to the inlet of the next stage expander; The hot path inlet of the expansion heat exchanger is communicated with the outlet of the heat storage tank via a second branch; the hot path outlet of the expansion heat exchanger is communicated with the inlet of the cold storage tank.

9. The purified compressed air energy storage power generation system according to claim 1, characterized in that: It also includes a gas storage subsystem, which includes a gas storage reservoir, a compression heat recovery heat exchanger and at least one compressor unit; all the compressor units are connected in series; The external air source passes through all the compressor units and then through the hot path of the compression heat recovery heat exchanger before entering the gas storage reservoir; the cold path inlet of the compression heat recovery heat exchanger is connected to the outlet of the cold storage tank, and the cold path outlet of the compression heat recovery heat exchanger is connected to the inlet of the heat storage tank.

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