Compressed air energy storage device

Abstract

The invention discloses a compressed air energy storage device which is characterized in that when the compressed air energy storage device is used, air is primarily compressed by an initial-section air compressor, the primarily compressed air is cooled and then conveyed into a first buffer tank through a pipeline, and after compressed air in the first buffer tank is stored to a certain pressure, the compressed air is conveyed into a middle-section air compressor; high-pressure air compressed by the middle-section air compressor is cooled and then conveyed and stored into the second buffer tank, after the high-pressure air in the second buffer tank is stored to a certain pressure, the high-pressure air is conveyed to the tail-section air compressor, and the high-pressure air compressed by the tail-section air compressor is cooled by the first heat exchanger and then stored into the third buffer tank; and after the high-pressure air in the third buffer tank is stored to meet the energy storage pressure, the high-pressure air is sequentially conveyed into the air storage tank, compressed air energy storage is achieved, through multi-stage compressed air, the situation that the single-time compressed air pressure difference is too large is reduced, and air compression is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of air energy storage, in particular to a compressed air energy storage device. Background Art

[0002] Power storage refers to the process of storing electricity through a medium or device and releasing it when needed. It is an important supporting technology to solve the problem of peak load shaving and valley filling of conventional electricity and improve the efficiency, safety and economy of conventional energy generation and transmission. Power storage technology can increase the ratio of clean energy generation, thereby achieving clean and efficient utilization of fossil energy, effectively reducing pollutant emissions, and greatly promoting the governance of environmental problems and improving the living environment. Compressed air energy storage is now also used as a form of energy storage.

[0003] However, when the current compressed air energy storage device compresses air to store energy, the high-pressure air will carry high temperature. If the high temperature is not recycled and utilized, it will inevitably cause the energy storage conversion rate to decrease. In view of the above problem, a compressed air energy storage device is proposed. Summary of the invention

[0004] The object of the present invention is to provide a compressed air energy storage device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A compressed air energy storage device comprises an initial stage air compressor, a middle stage air compressor, a tail stage air compressor, a temperature difference power generation plate, a storage module, a high temperature energy storage tank and a normal temperature energy storage tank, wherein the output end of the initial stage air compressor is connected in series with a first buffer tank through a connecting pipe, the output end of the first buffer tank is connected in series with the input end of the middle stage air compressor through a pipeline, the output end of the middle stage air compressor is connected in series with a second buffer tank through a pipeline, the output end of the second buffer tank is connected in series with the air inlet end of the tail stage air compressor through a pipeline, the tail stage air compressor is connected in series with a third buffer tank through a pipeline, the output end of the third buffer tank is connected to a plurality of air storage tanks through a pipeline, the output ends of the air storage tanks are commonly connected to the input end of an air expander, a second heat exchanger is arranged on the pipeline connected to the output end of the air storage tank, and a first heat exchanger is arranged on the pipeline connected in series between the initial stage air compressor and the first buffer tank, the pipeline connected in series between the middle stage air compressor and the second buffer tank, and the pipeline connected in series between the tail stage air compressor and the third buffer tank. The output end of the first heat exchanger is connected in parallel with the input end of the high-temperature energy storage tank through a pipeline, the output ends of the high-temperature energy storage tank and the normal temperature energy storage tank are connected in series with a delivery pump through a pipeline, the output end of the delivery pump connected in series with the output end of the normal temperature energy storage tank is connected in parallel with the input end of the first heat exchanger through a pipeline, the high temperature surface of the temperature difference power generation plate is fixedly connected with a heating coil, the output end of the delivery pump connected in series with the output end of the high-temperature energy storage tank is connected in series with the input end of the heating coil, the output end of the heating coil is connected in series with the input end of the normal temperature energy storage tank, a third valve is arranged on the pipeline connected in series between the heating coil and the delivery pump at the output end of the high-temperature energy storage tank, the output end of the third valve is connected in parallel with the input end of the second heat exchanger through a pipeline, and the parallel pipeline is provided with a third valve, the output end of the second heat exchanger is connected in parallel with the input end of the heating coil through a pipeline, the first buffer tank, the second buffer tank and the third buffer tank are all equipped with a first valve at the input end and output end connected to the pipeline, and the second valve is installed at the input end and output end of the gas storage tank connected to the pipeline.

[0006] As a further solution of the present invention: the air inlet of the initial stage air compressor is connected to a bag dust collector through a connecting pipe.

[0007] As a further solution of the present invention: a filter is provided at the rear end of the first heat exchanger in the pipeline connected in series with the output section of the initial air compressor and the air inlet end of the first buffer tank and the pipeline connected in series with the output section of the middle air compressor and the air inlet end of the second buffer tank.

[0008] As a further solution of the present invention: a drain valve is provided at the bottom of the first buffer tank, the second buffer tank and the third buffer tank, a first pressure gauge for detecting the air pressure is provided at the top of the first buffer tank, the second buffer tank and the third buffer tank, and a first safety valve is provided on the first buffer tank, the second buffer tank and the third buffer tank.

[0009] As a further solution of the present invention: a second pressure gauge for detecting air pressure is installed on the gas storage tank, and a second safety valve is provided on the gas storage tank.

[0010] As a further solution of the present invention: it also includes a photovoltaic power generation module, the electric energy generated by the photovoltaic power generation module is transmitted to the power storage module, and the power storage module is also used to store the electric energy generated by the thermoelectric power generation panel.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is in use, the delivery pump connected to the output end of the normal temperature energy storage tank delivers the cooling medium inside it to the first heat exchanger, cools the heat released in the compressed air when the air is compressed by the initial air compressor, the middle air compressor and the final air compressor, and delivers the cooling medium carrying high temperature after heat exchange in the first heat exchanger to the high temperature energy storage tank to achieve energy storage. When it is necessary to convert the energy generated by the compressed air into electrical energy, the air storage tank delivers high pressure air to the outside through the delivery end, opens the third valve connected to the input end of the second heat exchanger, closes another third valve, and the delivery pump connected to the high temperature energy storage tank works to deliver the cooling medium carrying high temperature in the high temperature energy storage tank to the second heat exchanger. In the second heat exchanger, the high-pressure air is heated by the high-temperature cooling medium passing through the second heat exchanger. The cooling medium after the initial cooling is transported to the heating coil, and the temperature difference power generation plate generates electricity. The cooled cooling medium is transported to the normal temperature energy storage tank. Similarly, the third valve connected to the input end of the second heat exchanger is closed, and another third valve is opened. The delivery pump connected to the high-temperature energy storage tank works to transport the high-temperature cooling medium in the high-temperature energy storage tank to the heating coil. The temperature difference power generation plate generates electricity through the temperature difference, and the cooled cooling medium is transported to the normal temperature energy storage tank. The heat generated by the compressed air is recovered, which is beneficial to improve the utilization rate of the electric energy used for compressed air and reduce energy waste.

[0012] 2. When the present invention is in use, the initial air compressor compresses the air for the first time, and the air after the initial compression is cooled and then transported to the first buffer tank through a pipeline. After the compressed air in the first buffer tank is stored to a certain pressure, it is transported to the middle air compressor. The high-pressure air compressed by the middle air compressor is cooled and then transported to the second buffer tank for storage. After the high-pressure air in the second buffer tank is stored to a certain pressure, it is transported to the tail air compressor. The high-pressure air compressed by the tail air compressor is cooled by the first heat exchanger and then stored in the third buffer tank. After the high-pressure air in the third buffer tank is stored to meet the energy storage pressure, it is sequentially transported to the air storage tank to realize compressed air energy storage. By multi-stage air compression, the excessive pressure difference of single compressed air is reduced, which is beneficial to air compression.

[0013] 3. The present invention removes dust from the air through a bag filter, and the air compressed by the initial air compressor, the middle air compressor and the final air compressor passes through corresponding filters for dehumidification and impurity removal, which is beneficial to the cleanliness of the stored compressed air and to extending the service life of the air storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the structure of a compressed air energy storage device.

[0015] Figure 2 This is a schematic diagram of the structure of a buffer tank in a compressed air energy storage device.

[0016] Figure 3 The figure is a schematic diagram of the structure of an air storage tank in a compressed air energy storage device.

[0017] In the figure: 1. initial air compressor; 2. middle air compressor; 3. final air compressor; 4. first buffer tank; 5. second buffer tank; 6. third buffer tank; 7. first heat exchanger; 8. filter; 9. bag filter; 10. air storage tank; 11. heating coil; 12. second heat exchanger; 13. temperature difference power generation board; 14. power storage module; 15. photovoltaic power generation module; 16. high temperature energy storage tank; 17. delivery pump; 18. normal temperature energy storage tank; 19. discharge valve; 20. first valve; 21. first safety valve; 22. first pressure gauge; 23. second valve; 24. second pressure gauge; 25. second safety valve; 26. third valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 3In an embodiment of the present invention, a compressed air energy storage device includes an initial stage air compressor 1, a middle stage air compressor 2, a tail stage air compressor 3, a temperature difference power generation board 13, a storage module 14, a high temperature energy storage tank 16 and a normal temperature energy storage tank 18. The output end of the initial stage air compressor 1 is connected in series with a first buffer tank 4 through a pipeline, the output end of the first buffer tank 4 is connected in series with the input end of the middle stage air compressor 2 through a pipeline, the output end of the middle stage air compressor 2 is connected in series with a second buffer tank 5 through a pipeline, and the output end of the second buffer tank 5 is connected to the tail stage air compressor through a pipeline. The air inlet end of the first section air compressor 1 and the first buffer tank 4 are connected in series, the tail section air compressor 3 is connected in series with the third buffer tank 6 through a pipeline, the output end of the third buffer tank 6 is connected to multiple air storage tanks 10 through a pipeline, the output end of the air storage tank 10 is commonly connected to the input end of the air expander, and the pipeline connected to the output end of the air storage tank 10 is provided with a second heat exchanger 12, the pipeline connected in series between the initial section air compressor 1 and the first buffer tank 4, the pipeline connected in series between the middle section air compressor 2 and the second buffer tank 5, and the pipeline connected in series between the tail section air compressor 3 and the third buffer tank 6 are all provided with a first heat exchanger 7, the first The output end of the heat exchanger 7 is connected in parallel with the input end of the high-temperature energy storage tank 16 through a pipeline, and the output ends of the high-temperature energy storage tank 16 and the normal temperature energy storage tank 18 are connected in series with a delivery pump 17 through a pipeline, and the output end of the delivery pump 17 connected in series with the output end of the normal temperature energy storage tank 18 is connected in parallel with the input end of the first heat exchanger 7 through a pipeline, and the high temperature surface of the temperature difference power generation plate 13 is fixedly connected with the heating coil 11, and the output end of the delivery pump 17 connected in series with the output end of the high temperature energy storage tank 16 is connected in series with the input end of the heating coil 11, and the output end of the heating coil 11 is connected in series with the input end of the normal temperature energy storage tank 18, and the heating coil A third valve 26 is provided on the pipeline connected in series between 11 and the delivery pump 17 at the output end of the high-temperature energy storage tank 16, the output end of the third valve 26 is connected in parallel with the input end of the second heat exchanger 12 through a pipeline, and the third valve 26 is provided on the parallel pipeline, the output end of the second heat exchanger 12 is connected in parallel with the input end of the heating coil 11 through a pipeline, the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6 are all installed with a first valve 20 at the input end and the output end connected to the pipeline, and the second valve 23 is installed at the input end and the output end of the gas storage tank 10 connected to the pipeline.

[0020] When in use, the initial air compressor 1 compresses the air for the first time, and the air after the initial compression is transported to the first buffer tank 4 through a pipeline. At the same time, the delivery pump 17 connected to the output end of the normal temperature energy storage tank 18 transports the cooling medium inside it to the first heat exchanger 7. The air compressed by the initial air compressor 1 is cooled by the first heat exchanger 7 and stored in the first buffer tank 4. After the compressed air in the first buffer tank 4 is stored to a certain pressure, it is transported to the middle air compressor 2. The high-pressure air compressed by the middle air compressor 2 is cooled by the first heat exchanger 7 and stored in the second buffer tank 5. After the high-pressure air in the second buffer tank 5 is stored to a certain pressure, it is transported to the tail air compressor 3. The high-pressure air compressed by the tail air compressor 3 is cooled by the first heat exchanger 7 and stored in the third buffer tank 6. After the high-pressure air in the third buffer tank 6 is stored to meet the energy storage pressure, it is transported to the air storage tank 10 in sequence to realize compressed air energy storage. The cooling medium carrying high temperature after heat exchange by the first heat exchanger 7 is transported to the high-temperature energy storage tank 16 to realize energy storage. When it is necessary to generate energy through compressed air When the energy of the high-temperature energy storage tank 16 is converted into electrical energy, the gas storage tank 10 delivers high-pressure air to the outside through the delivery end, opens the third valve 26 connected to the input end of the second heat exchanger 12, closes another third valve 26, and the delivery pump 17 connected to the high-temperature energy storage tank 16 works to deliver the high-temperature cooling medium in the high-temperature energy storage tank 16 to the second heat exchanger 12. The high-pressure air is heated by the high-temperature cooling medium passing through the second heat exchanger 12, and the cooling medium after the initial cooling is delivered to the heating coil 11, and the temperature difference power generation plate 13 generates electricity. The cooled cooling medium is transported to the normal temperature energy storage tank 18. Similarly, the third valve 26 connected to the input end of the second heat exchanger 12 is closed, and another third valve 26 is opened. The delivery pump 17 connected to the high temperature energy storage tank 16 works to transport the high temperature cooling medium in the high temperature energy storage tank 16 to the heating coil 11. The temperature difference power generation plate 13 generates electricity through the temperature difference. The cooled cooling medium is transported to the normal temperature energy storage tank 18. After the heat generated by the compressed air is recovered, it is beneficial to improve the utilization rate of the energy used by the compressed air.

[0021] The air inlet of the initial stage air compressor 1 is connected to a bag dust collector 9 through a connecting pipe, and the bag dust collector 9 is used to remove dust from the input air to ensure the cleanliness of the compressed air.

[0022] The pipeline connecting the output section of the initial air compressor 1 and the air inlet end of the first buffer tank 4 in series and the pipeline connecting the output section of the middle air compressor 2 and the air inlet end of the second buffer tank 5 in series are provided with a filter 8 at the rear end of the first heat exchanger 7, and the filter 8 dehumidifies and removes impurities from the cooled compressed air.

[0023] A drain valve 19 is provided at the bottom of the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6, and a first pressure gauge 22 for detecting air pressure is provided at the top of the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6, and a first safety valve 21 is provided on the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6. The air pressure in the corresponding first buffer tank 4, the second buffer tank 5 and the third buffer tank 6 is detected by the first pressure gauge 22 provided on the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6, and the first safety valve 21 on the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6 is cooperated to avoid overpressure or gas leakage and pressure loss when the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6 are stored, thereby ensuring the safety of the use of the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6, and the accumulated liquid accumulated in the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6 is discharged by the drain valve 19 provided at the bottom of the first buffer tank 4, the second buffer tank 5 and the third buffer tank 6.

[0024] The gas tank 10 is provided with a second pressure gauge 24 for detecting air pressure, and a second safety valve 25 is provided on the gas tank 10. The second pressure gauge 24 provided on the gas tank 10 can detect the pressure in the gas tank 10 in real time, and cooperate with the second safety valve 25 installed on the gas tank 10 to avoid overpressure of the gas tank 10 or timely detect whether the gas tank 10 is leaking, thereby improving the safety of the use of the gas tank 10.

[0025] It also includes a photovoltaic power generation module 15, and the electric energy generated by the photovoltaic power generation module 15 is transmitted to the power storage module 14, and the power storage module 14 is also used to store the electric energy generated by the thermoelectric power generation panel 13. The electric energy stored in the power storage module 14 is used to supplement the electric energy consumption in the device, making full use of light energy and heat energy, and reducing the consumption of resources during air energy storage.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressed air energy storage device, comprising an initial air compressor (1), a middle air compressor (2), a final air compressor (3), a temperature difference power generation plate (13), a power storage module (14), a high temperature energy storage tank (16) and a normal temperature energy storage tank (18), characterized in that: The output end of the initial air compressor (1) is connected in series with a first buffer tank (4) via a pipeline, the output end of the first buffer tank (4) is connected in series with the input end of the middle air compressor (2) via a pipeline, the output end of the middle air compressor (2) is connected in series with a second buffer tank (5) via a pipeline, the output end of the second buffer tank (5) is connected in series with the air inlet end of the tail air compressor (3) via a pipeline, the tail air compressor (3) is connected in series with a third buffer tank (6) via a pipeline, the output end of the third buffer tank (6) is connected to a plurality of air storage tanks (10) via pipelines, and the air storage tanks (10) are connected in series with each other. The output end is commonly connected to the input end of the air expander. A second heat exchanger (12) is arranged on the pipeline connected to the output end of the air storage tank (10). A first heat exchanger (7) is arranged on the pipeline connected in series between the initial air compressor (1) and the first buffer tank (4), the pipeline connected in series between the middle air compressor (2) and the second buffer tank (5), and the pipeline connected in series between the final air compressor (3) and the third buffer tank (6). The output end of the first heat exchanger (7) is connected in parallel to the input end of the high-temperature energy storage tank (16) through a pipeline. The high-temperature energy storage tank (16) and the normal-temperature energy storage tank (18) are connected in parallel. ) is connected in series with a delivery pump (17) via a pipeline, the output end of the delivery pump (17) connected in series with the output end of the normal temperature energy storage tank (18) is connected in parallel with the input end of the first heat exchanger (7) via a pipeline, the high temperature surface of the temperature difference power generation plate (13) is fixedly connected with a heating coil (11), the output end of the delivery pump (17) connected in series with the output end of the high temperature energy storage tank (16) is connected in series with the input end of the heating coil (11), the output end of the heating coil (11) is connected in series with the input end of the normal temperature energy storage tank (18), and the heating coil (11) and the delivery pump (17) at the output end of the high temperature energy storage tank (16) are connected in series. ), a third valve (26) is provided on a pipeline connected in series between the first and second heat exchangers (12), an output end of the third valve (26) is connected in parallel with an input end of the second heat exchanger (12) through a pipeline, and a third valve (26) is provided on the parallel pipeline, the output end of the second heat exchanger (12) is connected in parallel with an input end of the heating coil (11) through a pipeline, a first valve (20) is installed at the input end and output end of the first buffer tank (4), the second buffer tank (5) and the third buffer tank (6) connected to the pipeline, and a second valve (23) is installed at the input end and output end of the gas storage tank (10) connected to the pipeline.

2. A compressed air energy storage device according to claim 1, characterized in that: The air inlet of the initial stage air compressor (1) is connected to a bag dust collector (9) via a connecting pipe.

3. A compressed air energy storage device according to claim 1, characterized in that: The pipeline connecting the output section of the initial air compressor (1) and the air inlet end of the first buffer tank (4) in series and the pipeline connecting the output section of the middle air compressor (2) and the air inlet end of the second buffer tank (5) in series are provided with a filter (8) at the rear end of the first heat exchanger (7).

4. A compressed air energy storage device according to claim 1, characterized in that: A discharge valve (19) is provided at the bottom of the first buffer tank (4), the second buffer tank (5) and the third buffer tank (6), a first pressure gauge (22) for detecting air pressure is provided at the top of the first buffer tank (4), the second buffer tank (5) and the third buffer tank (6), and a first safety valve (21) is provided on the first buffer tank (4), the second buffer tank (5) and the third buffer tank (6).

5. A compressed air energy storage device according to claim 1, characterized in that: The gas storage tank (10) is provided with a second pressure gauge (24) for detecting air pressure, and the gas storage tank (10) is provided with a second safety valve (25).

6. A compressed air energy storage device according to claim 1, characterized in that: It also includes a photovoltaic power generation module (15), wherein the electric energy generated by the photovoltaic power generation module (15) is transmitted to the power storage module (14), and the power storage module (14) is also used to store the electric energy generated by the thermoelectric power generation panel (13).

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