A gas energy storage device

Abstract

This invention relates to a gas energy storage device, comprising an energy storage component, an energy release component, a transfer component, and a recovery component connected to the transfer component. The energy storage component is configured to compress a first gas and deliver it into an energy storage container to obtain a liquefied target gas, and a second gas stored in the energy storage container. The transfer component is configured to transfer the heat absorbed by the energy storage component after compressing the first gas to the energy release component. The recovery component is configured to absorb heat from the transfer component such that the heat absorbed by the transfer component from the energy storage component is equal to the sum of the heat transferred by the transfer component to the energy release component and the heat absorbed by the recovery component. This allows the remaining heat absorbed by the transfer component from the energy storage component to be transferred out through the recovery component, thereby solving the problem of mismatch between the energy storage component and the energy release component due to differences in gas volume, while still separating the target gas from the first gas, and improving energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of gas energy storage technology, and more specifically to a gas energy storage device. Background Technology

[0002] Gas energy storage refers to an energy storage method that uses electrical energy to compress gas during periods of low grid load and releases the compressed gas to drive a steam turbine to generate electricity during periods of high grid load. This method can store intermittent renewable energy sources such as wind, solar, and tidal power during periods of low electricity demand and then output them stably during periods of high demand, thus providing an effective solution for the large-scale utilization of renewable energy.

[0003] Gas energy storage can utilize a wide variety of gases, including air, pure gases, and industrial flue gas. During energy storage, multi-stage cooling is required during gas compression to reduce energy consumption. Conversely, during energy release, the compressed gas needs to be heated to fully release its stored energy. However, current technologies have limited research on energy distribution during storage and release; most methods rely on external cold and heat sources for cooling and heating, respectively, during storage and release.

[0004] Furthermore, the gases used in gas energy storage typically contain components such as carbon dioxide and oxygen, which are widely used in industrial production and manufacturing. Therefore, some target components can be separated during the gas energy storage process to improve economic efficiency. However, this results in different gas volumes during storage and release, leading to uneven energy distribution and energy surplus. Summary of the Invention

[0005] In view of the above-mentioned problems existing in the prior art, the present invention provides a gas energy storage device that can make full use of the energy in the gas energy storage process and improve the energy utilization rate.

[0006] The technical solution adopted by this invention to solve its technical problem is: to provide a gas energy storage device, comprising,

[0007] Energy storage components are used to input the first gas;

[0008] An energy release component is connected to an energy storage container. The energy storage component is configured to compress the first gas and deliver it into the energy storage container to obtain a liquefied target gas and a second gas stored in the energy storage container.

[0009] A transfer component, disposed between the energy storage component and the energy release component, is configured to transfer heat absorbed by the energy storage component after compressing the first gas to the energy release component; and

[0010] A recovery component is connected to the transfer component, the recovery component being configured to absorb heat from the transfer component such that the heat absorbed by the transfer component from the energy storage component is equal to the sum of the heat transferred by the transfer component to the energy release component and the heat absorbed by the recovery component.

[0011] Furthermore, the transfer assembly includes a first container and a second container for storing a heat exchange medium, wherein the temperature of the heat exchange medium stored in the first container is lower than the temperature of the heat exchange medium stored in the second container.

[0012] Furthermore, the transfer assembly also includes a first heat exchanger and a second heat exchanger connected to the energy storage assembly. The first container is configured to deliver the heat exchange medium inside the first container to the first heat exchanger and the second heat exchanger after the first gas is compressed by the energy storage assembly, so that the first heat exchanger and the second heat exchanger deliver the heat exchange medium after absorbing the heat of the first gas to the second container.

[0013] Furthermore, the energy storage assembly includes a first compressor and a second compressor for compressing the first gas, the second compressor being connected to the energy storage container, the first heat exchanger being disposed between the first compressor and the second compressor, and the second heat exchanger being disposed between the second compressor and the energy storage container.

[0014] Furthermore, the output end of the first container is connected to a first distributor, which is used to connect the first heat exchanger and the second heat exchanger.

[0015] Furthermore, the transfer assembly includes a third heat exchanger and a fourth heat exchanger connected to the energy release assembly. The second container is configured to deliver the heat exchange medium within the second container to the third and fourth heat exchangers when the energy storage container delivers the second gas to the energy release assembly, so that the third and fourth heat exchangers deliver the heat exchange medium, after conducting heat to the second gas, to the first container.

[0016] Furthermore, the energy release assembly includes a first expander connected to the energy storage container and a second expander connected to the first expander, a third heat exchanger disposed between the energy storage container and the first expander, and a fourth heat exchanger disposed between the first expander and the second expander.

[0017] Furthermore, the output end of the second container is connected to a second distributor, which is used to connect the third heat exchanger and the fourth heat exchanger.

[0018] Furthermore, the recovery assembly includes an evaporator connected to the second container and the first container, the evaporator being configured to absorb heat from the heat exchange medium as it flows from the heat exchange medium in the second container to the first container.

[0019] Furthermore, the recovery assembly also includes a condenser connected to the evaporator, and a compressor disposed between the evaporator and the condenser. The evaporator is configured to deliver a phase change medium to the condenser via the compressor after absorbing heat, so that the condenser can release the heat absorbed by the evaporator in a concentrated manner.

[0020] The beneficial effects of this invention are as follows: This invention provides a gas energy storage device, comprising an energy storage component for inputting a first gas, an energy release component connected to the energy storage component via an energy storage container, a transfer component disposed between the energy storage component and the energy release component, and a recovery component connected to the transfer component. The energy storage component is configured to compress the first gas and deliver it into the energy storage container to obtain a liquefied target gas, and a second gas stored in the energy storage container. The transfer component is configured to transfer the heat absorbed by the energy storage component after compressing the first gas to the energy release component. The recovery component is configured to absorb heat from the transfer component, such that the heat absorbed by the transfer component from the energy storage component is equal to the sum of the heat transferred by the transfer component to the energy release component and the heat absorbed by the recovery component. This allows the remaining heat absorbed by the transfer component from the energy storage component to be transferred out through the recovery component, thereby solving the problem of mismatch between the energy storage component and the energy release component due to differences in gas volume, while separating the target gas from the first gas, and improving energy utilization efficiency. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 The diagram shows a manifold structure of a gas energy storage device.

[0023] In the figure, the reference numerals are as follows: 100, gas energy storage device; 10, energy storage component; 11, first compressor; 12, second compressor; 20, energy release component; 21, first expander; 22, second expander; 30, energy storage container;

[0024] 40. Transfer assembly; 41. First container; 42. Second container; 43. First heat exchanger; 44. Second heat exchanger; 45. Third heat exchanger; 46. Fourth heat exchanger; 47. First distributor; 48. Second distributor; 50. Recovery assembly; 51. Evaporator; 52. Condenser; 53. Expansion valve; 54. Compressor. Detailed Implementation

[0025] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic structure of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] refer to Figure 1 As shown, the gas energy storage device 100 provided by the present invention includes an energy storage component 10 for inputting a first gas, an energy release component 20 connected to the energy storage component 10, and an energy storage container 30 communicating with the energy storage component 10 and the energy release component 20. The energy storage component 10 is configured to compress the input first gas in stages until a target gas mixed in the first gas is liquefied. The liquefied target gas is separated from the energy storage container 30, while the remaining second gas is stored in the energy storage container 30. In this way, excess electrical energy can be converted into the gas pressure potential energy of the second gas during off-peak hours. The energy release component 20 is configured to convert the gas pressure potential energy of the second gas output from the energy storage container 30 into electrical energy for power supply during peak hours.

[0027] The gas energy storage device 100 also includes a transfer component 40 disposed between the energy storage component 10 and the energy release component 20, and a recovery component 50 connected to the transfer component 40. The transfer component 40 is configured to transfer the heat from the first gas as it is progressively compressed by the energy storage component 10 to the energy release component 20, thereby heating the second gas input to the energy release component 20 and fully releasing the pressure energy of the second gas. Since the target gas separates from the first gas after pressurization, the heat absorbed by the transfer component 40 from the energy storage component 10 is necessarily greater than the heat absorbed by the energy release component 20 from the transfer component 40. Therefore, the recovery component 50 is configured to absorb heat from the transfer component 40 such that the heat absorbed by the transfer component 40 from the energy storage component 10 is equal to the sum of the heat absorbed by the energy release component 20 from the transfer component 40 and the heat absorbed by the recovery component 50. The heat absorbed by the recovery component 50 can be utilized through thermoacoustic power generation or other methods, thereby improving energy utilization efficiency.

[0028] It should be understood that the first gas input to the energy storage component 10 of the gas energy storage device 100 is a mixed gas, which includes at least a target gas and a second gas. The target gas can be one or more gases, such as carbon dioxide, oxygen, etc. The second gas can also be one or more gases, such as nitrogen, rare gases, etc.

[0029] In some implementations, the first gas can be air, industrial flue gas, or flue gas emitted from a power plant.

[0030] Combination Figure 1 As shown, in some embodiments, the energy storage assembly 10 includes a first compressor 11 for inputting a first gas, and a second compressor 12 for connecting the first compressor 11 and the energy storage container 30. The first compressor 11, the second compressor 12, and the energy storage container 30 are all connected by pipes.

[0031] In some embodiments, the first compressor 11 and the second compressor 12 perform two-stage compression on the input first gas to convert electrical energy into the gas pressure potential energy of the first gas. During the two-stage compression process, both the first compressor 11 and the second compressor 12 perform work on the first gas, thereby causing the temperature of the first gas to rise. The transfer component 40 can absorb the heat of the first gas after compression, thereby lowering the temperature of the first gas and ensuring that the first gas is compressed isothermally during each stage of compression, thus effectively reducing the compression difficulty of the first gas. After the first gas undergoes two-stage compression, the target gas in the first gas liquefies. At this point, the target gas can be separated from the remaining second gas.

[0032] In this embodiment, the target gas is carbon dioxide.

[0033] In some embodiments, the input end of the first compressor 11 may also be connected to a filter (not shown in the figure) via a pipe for filtering impurities such as dust and droplets from the first gas. Preferably, the filter can also absorb water vapor in the first gas to dry the first gas, thereby preventing the water vapor in the first gas from liquefying during subsequent compression and affecting the separation of the target gas.

[0034] As is easily understood, the energy storage container 30 can be a man-made container such as a storage tank or storage box with an internal cavity. Multiple energy storage containers 30 can be arranged, and the multiple energy storage containers 30 can be connected in series and / or parallel.

[0035] In other preferred embodiments and implementations, the second compressor 12 can also deliver the second gas, after two-stage compression, to abandoned mines, caves, expired oil and gas wells, or newly built gas storage wells with internal cavities for storage.

[0036] Combination Figure 1 As shown, in some embodiments, the energy release assembly 20 includes a first expander 21 connected to the energy storage container 30, and a second expander 22 connected to the first expander 21. The first expander 21, the second expander 22, and the energy storage container 30 are all connected by pipes.

[0037] In some embodiments, after the second gas in the energy storage container 30 is delivered to the first expander 21, the first expander 21 converts a portion of the pressure potential energy of the second gas into electrical energy. Then, upon passing through the second expander 22, the second expander 22 converts the remaining pressure potential energy of the second gas into electrical energy. The transfer assembly 40 conducts the heat generated during the compression of the first gas to the second gas within the energy release assembly 20, thereby heating the second gas before it reaches the first expander 21 and the second expander 22, ensuring that the pressure potential energy of the second gas is fully released.

[0038] In this embodiment, the first expander 21 and the second expander 22 can be steam turbines.

[0039] Combined again Figure 1 As shown, in some embodiments, the transfer assembly 40 includes a first container 41 and a second container 42 for storing the heat exchange medium, a first heat exchanger 43 and a second heat exchanger 44 connected to the energy storage assembly 10, and a third heat exchanger 45 and a fourth heat exchanger 46 connected to the energy release assembly 20. The first heat exchanger 43 and the second heat exchanger 44 are arranged in parallel between the first container 41 and the second container 42 via pipes, and the third heat exchanger 45 and the fourth heat exchanger 46 are also arranged in parallel between the first container 41 and the second container 42 via pipes.

[0040] The temperature of the heat exchange medium stored in the first container 41 is lower than the temperature of the heat exchange medium stored in the second container 42. The output of the first container 41 is connected to the first heat exchanger 43 and the second heat exchanger 44 via the first distributor 47, so as to transport the low-temperature heat exchange medium in the first container 41 to the first heat exchanger 43 and the second heat exchanger 44, thereby cooling the first gas in the energy storage assembly 10. The output of the second container 42 is connected to the third heat exchanger 45 and the fourth heat exchanger 46 via the second distributor 48, so as to transport the high-temperature heat exchange medium in the second container 42 to the third heat exchanger 45 and the fourth heat exchanger 46, thereby heating the second gas in the energy release assembly 20.

[0041] In some embodiments, a first heat exchanger 43 is disposed between a first compressor 11 and a second compressor 12, and a second heat exchanger 44 is disposed between the second compressor 12 and the energy storage container 30. After the first compressor 11 completes the first stage compression of the first gas, the first heat exchanger 43 transfers the heat of the first gas to the low-temperature heat exchange medium supplied from the first container 41. After the second compressor 12 completes the second stage compression of the first gas, the second heat exchanger 44 transfers the heat of the first gas to the low-temperature heat exchange medium supplied from the first container 41. Therefore, the temperature of the low-temperature heat exchange medium increases after passing through the first heat exchanger 43 and the second heat exchanger 44, and then flows to the second container 42. This achieves cooling of the first gas during the staged compression process, thereby effectively increasing the pressure potential energy of the first gas and reducing the compression difficulty of the first gas.

[0042] After the second compressor 12 completes the second stage compression of the first gas, the second heat exchanger 44 cools the first gas flowing into the energy storage container 30. As the temperature decreases, the target gas in the first gas gradually liquefies. At this point, the liquefied target gas can be separated from the energy storage container 30, leaving only the high-pressure second gas in the energy storage container 30.

[0043] In some preferred embodiments, the first distributor 47 is configured to adjust the flow rate of the cryogenic heat exchange medium delivered to the first heat exchanger 43 and the second heat exchanger 44 in order to adjust the cooling effect of the first gas after the first stage compression and the second stage compression.

[0044] In some embodiments, a third heat exchanger 45 is disposed between the energy storage container 30 and the first expander 21, and a fourth heat exchanger 46 is disposed between the first expander 21 and the second expander 22. When the energy storage container 30 delivers its internal second gas to the first expander 21, the third heat exchanger 45 transfers heat from the high-temperature heat exchange medium delivered from the second container 42 to the second gas delivered to the first expander 21. When the first expander 21 delivers the second gas, which has partially converted its pressure potential energy into electrical energy, to the second expander 22, the fourth heat exchanger 46 transfers heat from the high-temperature heat exchange medium delivered from the second container 42 to the second gas delivered to the second expander 22. Therefore, the high-temperature heat exchange medium cools down after passing through the third heat exchanger 45 and the fourth heat exchanger 46 before flowing back to the first container 41. This achieves heating of the second gas before it converts its pressure potential energy into electrical energy, thus fully releasing the pressure potential energy of the second gas.

[0045] In some preferred embodiments, the second distributor 48 is configured to adjust the flow rate of the high-temperature heat exchange medium delivered to the third heat exchanger 45 and the fourth heat exchanger 46 in order to adjust the heating effect on the second gas delivered to the first expander 21 and the second expander 22.

[0046] In some embodiments, the energy storage component 10 and the energy release component 20 can operate independently or simultaneously. When the energy storage component 10 operates independently, it continuously compresses the first gas to convert excess electrical energy into gas pressure potential energy. Simultaneously, the energy storage component 10 continuously liquefies the target gas to separate it. The transfer component 40 delivers the low-temperature heat exchange medium in the first container 41 to the first heat exchanger 43 and the second heat exchanger 44 to cool the compressed first gas during the operation of the energy storage component 10. The first heat exchanger 43 and the second heat exchanger 44 deliver the heated heat exchange medium to the second container 42 for storage, to be used to heat the second gas output from the energy storage container 30 during the operation of the energy release component 20.

[0047] When the energy release component 20 operates independently, the second gas output from the energy storage component 10 passes sequentially through the first expander 21 and the second expander 22 to convert gas pressure potential energy into electrical energy. Meanwhile, the transfer component 40 transports the high-temperature heat exchange medium from the second container 42 to the third heat exchanger 45 and the fourth heat exchanger 46 to heat the second gas flowing towards the first expander 21 and the second expander 22 during the operation of the energy release component 20. The third heat exchanger 45 and the fourth heat exchanger 46 then transport the cooled heat exchange medium to the first container 41 for storage, so as to cool the first gas supplied to the energy storage container 30 during the operation of the energy storage component 10.

[0048] In some preferred embodiments, the shell of the first container 41 may be made of a metal material with good thermal conductivity so that the heat exchange medium flowing in from the third heat exchanger 45 and the fourth heat exchanger 46 can fully transfer the remaining heat to the external environment, thereby ensuring that the temperature of the heat exchange medium flowing into the first container 41 is reduced as much as possible.

[0049] In some preferred embodiments, the shell of the second container 42 is provided with an insulation layer to minimize the heat transfer of the heat exchange medium flowing into the first heat exchanger 43 and the second heat exchanger 44 to the external environment.

[0050] In some embodiments, the heat exchange medium may be water, heat transfer oil, etc.

[0051] Combination Figure 1 As shown, in some embodiments, the recovery assembly 50 includes an evaporator 51 connected to the second distributor 48 and the first container 41, a condenser 52 connected to the evaporator 51 via pipes, and an expansion valve 53 and a compressor 54 disposed between the evaporator 51 and the condenser 52. The pipes of the recovery assembly 50 are filled with a phase change medium so that the heat absorbed by the evaporator 51 from the transfer assembly 40 is concentratedly released through the condenser 52, thereby utilizing a portion of the heat from the transfer assembly 40 in other forms.

[0052] In some embodiments, when the high-temperature heat exchange medium in the second container 42 flows from the second distributor 48 through the evaporator 51 to the first container 41, the low-temperature, low-pressure, liquid phase change medium in the evaporator 51 absorbs heat from the high-temperature heat exchange medium, thus obtaining a low-temperature, low-pressure gaseous phase change medium. The evaporator 51 delivers the low-temperature, low-pressure gaseous phase change medium to the compressor 54 for compression, obtaining a high-temperature, high-pressure gaseous phase change medium that is delivered to the condenser 52. The high-temperature, high-pressure gaseous phase change medium liquefies in the condenser 52, releasing heat and obtaining a high-temperature, high-pressure liquid phase change medium. The condenser 52 delivers the high-temperature, high-pressure liquid phase change medium to the expansion valve 53 for pressure reduction and throttling, thereby obtaining a low-temperature, low-pressure liquid phase change medium delivered to the evaporator 51. By continuously repeating the above process, the heat absorbed by the recovery component 50 from the transfer component 40 can be concentrated and released through the condenser 52 for utilization through thermoacoustic power generation or other methods, thereby improving energy utilization efficiency.

[0053] In the description of this invention, 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; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 the present invention and simplifying the description, and are not intended to 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 the present invention.

[0055] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A gas energy storage device, comprising, Energy storage component (10) for inputting the first gas; An energy release component (20) is connected to the energy storage component (10) via an energy storage container (30). The energy storage component (10) is configured to compress the first gas and deliver it to the energy storage container (30) to obtain the liquefied target gas and the second gas stored in the energy storage container (30). A transfer component (40) is disposed between the energy storage component (10) and the energy release component (20), the transfer component (40) being configured to transfer the heat absorbed by the energy storage component (10) after compressing the first gas to the energy release component (20); as well as A recovery component (50) is connected to the transfer component (40), the recovery component (50) being configured to absorb heat from the transfer component (40) such that the heat absorbed by the transfer component (40) from the energy storage component (10) is equal to the sum of the heat transferred by the transfer component (40) to the energy release component (20) and the heat absorbed by the recovery component (50).

2. The gas energy storage device according to claim 1, characterized in that, The transfer assembly (40) includes a first container (41) and a second container (42) for storing a heat exchange medium, wherein the temperature of the heat exchange medium stored in the first container (41) is lower than the temperature of the heat exchange medium stored in the second container (42).

3. The gas energy storage device according to claim 2, characterized in that, The transfer assembly (40) further includes a first heat exchanger (43) and a second heat exchanger (44) connected to the energy storage assembly (10). The first container (41) is configured to deliver the heat exchange medium in the first container (41) to the first heat exchanger (43) and the second heat exchanger (44) after the first gas is compressed by the energy storage assembly (10), so that the first heat exchanger (43) and the second heat exchanger (44) deliver the heat exchange medium after absorbing the heat of the first gas to the second container (42).

4. The gas energy storage device according to claim 3, characterized in that, The energy storage assembly (10) includes a first compressor (11) and a second compressor (12) for compressing the first gas, the second compressor (12) being connected to the energy storage container (30), the first heat exchanger (43) being disposed between the first compressor (11) and the second compressor (12), and the second heat exchanger (44) being disposed between the second compressor (12) and the energy storage container (30).

5. The gas energy storage device according to claim 3, characterized in that, The output end of the first container (41) is connected to the first distributor (47) for connecting the first heat exchanger (43) and the second heat exchanger (44).

6. The gas energy storage device according to claim 2, characterized in that, The transfer assembly (40) includes a third heat exchanger (45) and a fourth heat exchanger (46) connected to the energy release assembly (20). The second container (42) is configured to deliver the heat exchange medium in the second container (42) to the third heat exchanger (45) and the fourth heat exchanger (46) when the energy storage container (30) delivers the second gas to the energy release assembly (20), so that the third heat exchanger (45) and the fourth heat exchanger (46) deliver the heat exchange medium after conducting heat to the second gas to the first container (41).

7. The gas energy storage device according to claim 6, characterized in that, The energy release assembly (20) includes a first expander (21) connected to the energy storage container (30) and a second expander (22) connected to the first expander (21), a third heat exchanger (45) disposed between the energy storage container (30) and the first expander (21), and a fourth heat exchanger (46) disposed between the first expander (21) and the second expander (22).

8. The gas energy storage device according to claim 6, characterized in that, The output end of the second container (42) is connected to the second distributor (48) for connecting the third heat exchanger (45) and the fourth heat exchanger (46).

9. The gas energy storage device according to claim 2, characterized in that, The recovery assembly (50) includes an evaporator (51) connected to the second container (42) and the first container (41), the evaporator (51) being configured to absorb heat from the heat exchange medium as it flows from the heat exchange medium in the second container (42) to the first container (41).

10. The gas energy storage device according to claim 9, characterized in that, The recovery assembly (50) also includes a condenser (52) connected to the evaporator (51) and a compressor disposed between the evaporator (51) and the condenser (52). The evaporator (51) is configured to deliver a phase change medium to the condenser (52) via the compressor after absorbing heat, so that the condenser (52) can release the heat absorbed by the evaporator (51) in a concentrated manner.

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