Channel heat exchange device and compressed air energy storage system

Abstract

The utility model relates to the technical field of compressed air energy storage, in particular to a channel heat exchange device and a compressed air energy storage system. A gas transmission channel is formed in the device body; the two ends of the air conveying channel are connected with air conveying pipelines correspondingly and used for introducing compressed air. A spraying system is arranged at the top of the air conveying channel and used for spraying vaporific liquid drops, and heat exchange is conducted between the vaporific liquid drops and compressed air; a collecting device is arranged at the bottom of the gas conveying channel and used for collecting liquid obtained after heat exchange is completed. Therefore, the problems that the heat exchange efficiency cannot be effectively improved, the energy utilization rate and the overall performance of the compressed air energy storage system are reduced, the use experience of a user is affected and the like due to temperature difference limitation and low heat transfer efficiency between heat exchange media in related technologies are solved.

Description

Technical Field

[0001] This utility model relates to the field of compressed air energy storage technology, and in particular to a channel heat exchange device and a compressed air energy storage system. Background Technology

[0002] Currently, compressed air energy storage systems are widely used in the energy sector as a highly efficient energy storage method. In current systems, the heat exchange process on the compression and expansion sides is crucial to system performance and energy efficiency. Traditional heat exchange methods suffer from low efficiency and high energy consumption, limiting the further development and application of compressed air energy storage systems.

[0003] In related technologies, air-to-air or water-to-air heat exchangers are typically used to achieve heat exchange in adiabatic compressed air energy storage systems. However, due to the temperature difference limitations between the heat exchange media and the low heat transfer efficiency, the heat exchange efficiency cannot be effectively improved, which reduces the energy utilization rate and overall performance of the compressed air energy storage system and affects the user experience. Utility Model Content

[0004] This invention provides a channel heat exchange device and a compressed air energy storage system to solve the problems in related technologies, such as the inability to effectively improve heat exchange efficiency due to the temperature difference between heat exchange media and the low heat transfer efficiency, which reduces the energy utilization rate and overall performance of the compressed air energy storage system and affects the user experience.

[0005] The first aspect of this utility model proposes a channel heat exchange device, wherein the device includes: a device body; an air supply channel formed inside the device body; air supply pipes connected to both ends of the air supply channel for introducing compressed air; a spraying system provided at the top of the air supply channel for spraying mist-like droplets, and using the mist-like droplets to exchange heat with the compressed air; and a collecting device provided at the bottom of the air supply channel for collecting the liquid after the heat exchange is completed.

[0006] According to the present invention, the channel heat exchange device consists of a gas delivery pipeline, a collection device, and a spraying system, which makes the heat exchange process more efficient, thereby better absorbing the heat of compression and increasing the temperature of the gas at the inlet of the expander, ensuring the recycling of the heat of compression, effectively improving the energy conversion efficiency of the compressed air system, reducing energy consumption, and improving the overall performance of the system.

[0007] In addition, the channel heat exchange device proposed above according to this utility model may also have the following additional technical features:

[0008] Optionally, the bottom of the device body is funnel-shaped.

[0009] Optionally, the bottom of the device body is connected to a cold storage system or a heat storage system via a water pipeline, and the liquid after heat exchange is stored in the cold storage system or the heat storage system.

[0010] Optionally, valves are installed on the water supply pipeline to control the opening and closing of the water supply pipeline.

[0011] Optionally, the spraying system is connected to a cold storage system or a heat storage system, and the spraying system includes at least one nozzle for spraying the liquid stored in the cold storage system or the heat storage system into a mist of droplets.

[0012] The second aspect of this utility model proposes a compressed air energy storage system, comprising: an electric motor, a generator, a cold storage system, a heat storage system, and a gas storage device; multiple channel heat exchange devices as described in the above embodiments; a compressor unit, comprising a multi-stage compressor, with a channel heat exchange device installed after each stage compressor; the collection device of the channel heat exchange device installed after each stage compressor is connected to the heat storage system, and the spraying system is connected to the cold storage system, for progressively cooling the compressed air of the compressor unit; storing the compressed air through the gas storage device; and storing the high-temperature heat exchange medium through the heat storage system; and an expander unit, comprising a multi-stage expander, with a channel heat exchange device installed before each stage expander; the collection device of the channel heat exchange device installed before each stage expander is connected to the cold storage system, and the spraying system is connected to the heat storage system, for progressively heating the compressed air provided by the expansion and gas storage device; using the expanded compressed air to drive the generator to generate electricity; and storing the low-temperature heat exchange medium through the cold storage system.

[0013] According to the compressed air energy storage system of this utility model, the above-mentioned channel heat exchange device is used. The device is added after each stage compressor and before each stage expander, which makes the heat exchange process more efficient, thereby better absorbing the heat of compression and increasing the gas temperature at the expander inlet. This can effectively improve the energy conversion efficiency of the system, reduce energy consumption, improve the overall performance of the system, and allow the heat exchange medium and heat of compression to be recycled, thereby improving the energy utilization rate of the system.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 This is a block diagram of a channel heat exchange device according to an embodiment of the present utility model;

[0017] Figure 2This is a schematic diagram of a channel heat exchange device according to an embodiment of the present invention;

[0018] Figure 3 This is a block diagram of a compressed air energy storage system according to an embodiment of the present utility model;

[0019] Figure 4 This is an example diagram of a compressed air energy storage system provided according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: channel heat exchange device-10, gas transmission pipeline-11, collection device-12, spraying system-13, valve-14, heat storage system-25, cold storage system-26, device body-101, gas transmission channel-102, water transmission pipeline-103; compressed air energy storage system-30, compressor-22, expander-27, expander unit-201, compressor unit-202, electric motor-21, gas storage device-24, and generator-28. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 utility model according to the specific circumstances.

[0024] The following description, with reference to the accompanying drawings, illustrates an embodiment of the channel heat exchange device and compressed air energy storage system of this utility model. Addressing the problems mentioned in the background art where temperature differences between heat exchange media and low heat transfer efficiency hinder effective heat exchange efficiency improvement, thus reducing the energy utilization rate and overall performance of the compressed air energy storage system and impacting user experience, this utility model provides a channel heat exchange device. This device includes: a device body; an air delivery channel formed inside the device body; air delivery pipes connected to both ends of the air delivery channel for introducing compressed air; a spraying system at the top of the air delivery channel for spraying mist-like droplets, utilizing the mist-like droplets for heat exchange with the compressed air; and a collection device at the bottom of the air delivery channel for collecting the liquid after heat exchange. This solves the problems in the related art where temperature differences between heat exchange media and low heat transfer efficiency hinder effective heat exchange efficiency improvement, thus reducing the energy utilization rate and overall performance of the compressed air energy storage system and impacting user experience.

[0025] The channel heat exchange device proposed in the embodiments of this utility model will first be described with reference to the accompanying drawings.

[0026] Figure 1 A block diagram of a channel heat exchange device provided in an embodiment of this utility model.

[0027] like Figure 1 As shown, the channel heat exchange device 10 of this utility model embodiment includes: a device body 101; an air supply channel 102 is formed inside the device body 101; air supply pipes 11 are respectively connected to both ends of the air supply channel 102 for introducing compressed air; a spraying system 13 is provided at the top of the air supply channel 102 for spraying mist droplets and using the mist droplets to exchange heat with the compressed air; and a collecting device 12 is provided at the bottom of the air supply channel 102 for collecting the liquid after the heat exchange is completed.

[0028] Specifically, such as Figure 2 As shown, the gas pipeline 11 can be a small rigid gas pipeline, and the collection device 12 can be a liquid collection device.

[0029] When compressed air passes through this channel, the spraying system 13 starts to work, converting the low-temperature heat exchange medium in the cold storage system 26 into mist droplets. The low-temperature mist droplets have a larger heat exchange area with the high-temperature compressed air, and the heat is transferred from the compressed air to the heat exchange medium.

[0030] This embodiment of the invention prevents compressed air from flowing from the liquid collection device 12 into the heat storage system 25 or the cold storage system 26 due to the lack of liquid obstruction, thus avoiding energy waste and even damage to the heat storage circulation system. Furthermore, the liquid level needs to be slightly lower than the pipe section and not exceed the pipe height to prevent flow loss of compressed gas due to changes in pipe diameter.

[0031] Among them, the small rigid gas transmission pipeline 11 is a rigid gas transmission channel that is slightly wider than the gas transmission channel. It can ensure that the channel has sufficient strength and sealing to withstand high-pressure gas and frequent filling and discharging cycles.

[0032] Therefore, in this invention, a channel heat exchange device is proposed to replace the heat exchanger in a compressed air energy storage system. This device consists of a small rigid gas delivery pipe, a liquid collection device, and a spraying system, making the heat exchange process more efficient. This allows for better absorption of compression heat and increases the turbine inlet gas temperature, effectively improving the system's energy conversion efficiency, reducing energy consumption, and enhancing the overall system performance.

[0033] Optionally, in one embodiment of the present invention, the bottom of the device body 101 is funnel-shaped.

[0034] It should be noted that the bottom of the device body 101 needs to maintain a certain height of liquid. The height is not specifically limited and can be set by those skilled in the art according to the actual situation.

[0035] Specifically, such as Figure 2 As shown, the bottom of the device body 101 in this embodiment of the present invention is funnel-shaped, which facilitates the rapid and concentrated flow of liquid to the bottom of the device after heat exchange is completed inside the channel heat exchange device 10, making it easier for subsequent liquid collection and processing, and ensuring that the funnel-shaped liquid collection device 12 can effectively collect the heat exchange medium sprayed from the spraying system 13.

[0036] The heat exchange medium can be water, biomass oil, ethylene glycol, etc., and those skilled in the art can set it according to the actual situation without making specific limitations.

[0037] Optionally, in one embodiment of the present invention, the bottom of the device body 101 is connected to the cold storage system 26 or the heat storage system 25 through a water supply pipe 103, and the liquid after heat exchange is stored through the cold storage system 26 or the heat storage system 25.

[0038] Therefore, in this embodiment of the invention, the liquid after heat exchange is allowed to flow directly into the cold storage system 26 or the heat storage system 25 through the water supply pipe 103, so as to realize the storage and reuse of heat, thereby improving the thermal efficiency of the system and reducing heat loss.

[0039] Optionally, in one embodiment of the present invention, a valve 14 is provided on the water supply pipeline 103 for controlling the opening and closing of the water supply pipeline.

[0040] Therefore, in this embodiment of the utility model, valve 14 can control the opening and closing of the water supply pipeline, thereby achieving precise control of liquid flow. It can send the liquid collected by liquid collection device 12 to cold storage system 26 or heat storage system 25 while maintaining the liquid height at the bottom unchanged, so that the system can adjust the liquid flow according to actual needs, increasing the system's flexibility and operability.

[0041] Optionally, the spraying system 13 is connected to the cold storage system 26 or the heat storage system 25. The spraying system 13 includes at least one nozzle for spraying the liquid stored in the cold storage system 26 or the heat storage system 25 into a mist of droplets.

[0042] Understandably, the spraying system 13 includes nozzles, pipes, and control valves, used to spray the heat exchange medium into a mist of droplets in the channel heat exchange device 23, thereby achieving sufficient heat exchange with the compressed air.

[0043] Specifically, when compressed gas flows through the channel, the spraying system 13 at the top of the channel heat exchange device 10 starts working, converting the heat exchange medium from the heat storage system 25 or the cold storage system 26 into mist-like water droplets that fall from the top, making full contact with the compressed air to achieve the effect of heat exchange. After the heat exchange with the compressed gas is completed, the heat exchange medium eventually collects in the bottom collection device 12 under the action of gravity.

[0044] According to the embodiment of this utility model, the channel heat exchange device consists of a gas delivery pipeline, a collection device, and a spraying system, which makes the heat exchange process more efficient, thereby better absorbing the heat of compression and increasing the temperature of the gas at the inlet of the expander, ensuring the recycling of the heat of compression, effectively improving the energy conversion efficiency of the compressed air system, reducing energy consumption, and improving the overall performance of the system.

[0045] This invention also proposes a compressed air energy storage system.

[0046] like Figure 3As shown, the compressed air energy storage system 30 includes: an electric motor 21, a generator 28, a cold storage system 26, a heat storage system 25, and an air storage device 24; multiple channel heat exchange devices 10 as described in the above embodiment; a compressor unit 202, which includes a multi-stage compressor 22, with a channel heat exchange device 10 installed after each stage compressor 22. The collection device 12 of each channel heat exchange device 10 installed after each stage compressor 22 is connected to the heat storage system 25, and the spraying system 13 is connected to the cold storage system 26, for progressively cooling the compressed air of the compressor unit 202, and storing the compressed air through the air storage device 24. Compressed air is stored in a heat storage system 25 to generate high-temperature heat exchange medium; an expander unit 201 includes a multi-stage expander 27, with a channel heat exchange device 10 installed before each stage expander 27. The collection device 12 of the channel heat exchange device 10 installed before each stage expander 27 is connected to a cold storage system 26, and the spraying system 13 is connected to the heat storage system 25. This is used to heat the compressed air provided by the expansion and storage device 24 in stages, and to use the compressed air after expansion to drive the generator 28 to generate electricity. The low-temperature heat exchange medium is stored in the cold storage system 26.

[0047] It is understandable that, such as Figure 3 As shown, when the compressed air energy storage system 30 starts working, air is compressed by the compressor 22, generating a large amount of heat during compression. If this heat is not recovered and utilized, it will result in significant energy waste. Furthermore, as the number of compression stages increases, prolonged unrecovered heat can lead to excessively high internal system temperatures, potentially damaging equipment and pipelines, shortening equipment lifespan, and increasing maintenance costs. Simultaneously, during the energy release phase, the compressed air in the compressed air energy storage system 30 needs to be heated to increase its temperature and pressure, thereby improving the system's energy conversion efficiency during expansion. Heating allows the compressed air on the expansion side to reach higher temperature and pressure levels, thereby increasing the output power of the expander 27 and maximizing the conversion of stored energy. Without heating the compressed air on the expansion side, its temperature becomes extremely low. When low-temperature compressed air enters the expander 27 or the air storage device 24, it may cause problems such as equipment icing and pipeline condensation, affecting normal equipment operation.

[0048] Specifically, such as Figure 4 As shown, Figure 4Taking a compressed air energy storage system 30 equipped with a three-stage compressor and a three-stage expander as an example. When the channel heat exchange device 10 is installed after each stage compressor 22, and it is necessary to collect the heat of compression generated during the compression process, the low-temperature heat exchange medium is sent from the cold storage system 26 to the spraying system 13. When compressed air passes through this channel, the spraying system 13 starts working, and the compressor 22 continuously and stably provides compressed air through the heat exchange channel. After heat exchange, the collected high-temperature heat exchange medium is sent to the heat storage system 25. When the channel heat exchange device 10 is installed before each stage expander 27, and it is necessary to heat the compressed air, the high-temperature heat exchange medium is sent from the heat storage system 25 to the spraying system 13. When compressed air passes through this channel, the spraying system 13 starts working, and the air storage device 24 continuously and stably provides compressed air through the heat exchange channel. After heat exchange, the collected low-temperature heat exchange medium is sent to the cold storage system 26.

[0049] Next, we will introduce the working process of the compressor unit 202 in the compressed air energy storage system 30.

[0050] like Figure 4 As shown, when the channel heat exchange device 10 is installed after each stage compressor 22, air is compressed by the compressor and flows out of the compressor 22 outlet before entering the heat exchange device 10. The compressed air exchanges heat with a pre-prepared heat exchange medium, while the heat exchange medium (the low-temperature heat exchange medium in the cold storage system 26) is prepared. After heat exchange, the high-temperature heat exchange medium falls to the bottom collection device 12 due to gravity, and the liquid level is maintained at a stable height due to the action of the control valve 14. The high-temperature heat exchange medium is then sent to the heat storage system 25 for storage. Meanwhile, the low-temperature compressed air is continuously supplied to the next stage compressor by the compressor 22. After compression in the next stage compressor, it generates heat of compression, and the above process is repeated until the compressed air is sent to the air storage device 24 for storage.

[0051] Next, we will introduce the working process of the expander unit 201 in the compressed air energy storage system 30.

[0052] like Figure 4As shown, when the channel heat exchange device 10 is installed before each stage expander 27, compressed air flows out of the outlet of the air storage device 24 and enters the channel heat exchange device 10. The compressed air exchanges heat with the pre-prepared heat medium, while the heat exchange medium (the high-temperature heat exchange medium in the heat storage system 25) is prepared. When the compressed air passes through this channel, the spray system 13 starts to work, converting the high-temperature liquid in the heat storage system 25 into mist droplets, and the heat is transferred from the heat exchange medium to the compressed air. After the heat exchange is completed, the low-temperature heat exchange medium falls to the bottom collection device 12 due to gravity, and the liquid level is maintained at a stable height due to the action of the control valve 14. The low-temperature heat exchange medium is sent to the cold storage system 26 for storage. Meanwhile, the high-temperature compressed air is continuously sent to the pipeline by the expander 27 and enters the next stage expander 27. After the next stage expander 27, it is cooled by the turbine, and the above process is repeated until the compressed air turbine is completed and discharged into the atmosphere.

[0053] In summary, the cold storage system 26 first sends the low-temperature heat exchange medium to the channel heat exchange device 10 on the compression side. After heat exchange, the high-temperature heat exchange medium is sent to the heat storage system 25. The heat storage system 25 sends the high-temperature heat exchange medium to the channel heat exchange device 10 on the expansion side. After heat exchange, the low-temperature heat exchange medium is sent to the cold storage system 25. This forms a circulating system for the heat exchange medium, which can be recycled, thereby improving the energy utilization efficiency of the system.

[0054] According to the compressed air energy storage system proposed in this embodiment of the present invention, the above-mentioned channel heat exchange device is used. The device is added after each stage compressor and before each stage expander, making the heat exchange process more efficient, thereby better absorbing the heat of compression and increasing the gas temperature at the expander inlet. This can effectively improve the energy conversion efficiency of the system, reduce energy consumption, improve the overall performance of the system, and allow the heat exchange medium and the heat of compression to be recycled, thereby improving the energy utilization rate of the system.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A channel heat exchanging device characterized by, include: device body; The device body has an internal gas delivery channel; The gas delivery channel is connected to gas delivery pipes at both ends for supplying compressed air. A spraying system is provided at the top of the gas delivery channel for spraying mist droplets, which exchange heat with the compressed air. The spraying system includes nozzles, pipes, and control valves. A collection device is installed at the bottom of the gas delivery channel to collect the liquid after heat exchange is completed.

2. The channel heat exchanger of claim 1, wherein The bottom of the device body is funnel-shaped.

3. The channel heat exchanger of claim 1, wherein The bottom of the device body is connected to a cold storage system or a heat storage system via a water pipeline, and the liquid after heat exchange is stored through the cold storage system or the heat storage system.

4. The channel heat exchange device according to claim 3, characterized in that, The water pipeline is equipped with valves to control the opening and closing of the water pipeline.

5. The channel heat exchange device according to claim 3, characterized in that, The spraying system is connected to the cold storage system or the heat storage system, and the spraying system includes at least one nozzle for spraying the liquid stored in the cold storage system or the heat storage system into a mist of droplets.

6. A compressed air energy storage system, characterized in that, include: Electric motors, generators, cold storage systems, heat storage systems, and gas storage devices; The channel heat exchange device according to any one of claims 1-5; The compressor unit includes a multi-stage compressor, with a channel heat exchange device installed after each stage compressor. The collection device of the channel heat exchange device installed after each stage compressor is connected to the heat storage system, and the spraying system is connected to the cold storage system. This is used to cool the compressed air of the compressor unit stage by stage, store the compressed air through the air storage device, and store the high-temperature heat exchange medium through the heat storage system. An expander unit, comprising a multi-stage expander, with a channel heat exchange device installed before each stage expander. The collection device of the channel heat exchange device installed before each stage expander is connected to the cold storage system, and the spraying system is connected to the heat storage system. This is used to heat and expand the compressed air provided by the gas storage device stage by stage, use the expanded compressed air to drive the generator to generate electricity, and store the low-temperature heat exchange medium through the cold storage system.

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