A method and system for storing and releasing carbon dioxide phase change energy

Abstract

The present application provides a carbon dioxide phase change energy storage and release method and system, the energy storage and release method includes a condensation stage and a vaporization stage, and a gaseous carbon dioxide purification process; in the condensation stage, high-pressure gaseous carbon dioxide is converted into liquid carbon dioxide through a first phase change conversion element; in the vaporization stage, the liquid carbon dioxide is converted into gaseous carbon dioxide through a second phase change conversion element; after the vaporization stage and before the condensation stage, the gaseous carbon dioxide purification process is used to remove impurities in the gaseous carbon dioxide; wherein the types of the impurities are one or more.

Description

Technical Field

[0001] The present application belongs to the field of phase change energy storage and release technology, and more specifically, to a carbon dioxide phase change energy storage and release method and system. Background Art

[0002] In the construction of energy storage systems for new power energy structures, the physical compression energy storage technology of gas-liquid two-phase carbon dioxide has outstanding advantages such as simple process, mature equipment, high safety and reliability, and high energy utilization efficiency. It is widely recognized in the professional and technical field. Therefore, the construction of gas-liquid two-phase carbon dioxide compression energy storage system presents significant latecomer advantages.

[0003] In the gas-liquid two-phase carbon dioxide energy storage system, carbon dioxide is used as a working fluid to undergo a closed cycle phase change in the system. The general working fluid cycle process is gas phase low-pressure storage, gas phase compression, heat exchange cooling, phase change liquefaction, liquid phase storage, phase change vaporization, heat exchange heating, and expansion work. As a circulating working fluid, carbon dioxide gas has relatively stable chemical properties, is safe and non-toxic, and is easy to change into a gas-liquid phase. The gas density is large, which is conducive to process cycles and turbine expansion work.

[0004] However, the existing gas-liquid two-phase carbon dioxide energy storage system has no targeted design solution for the purity of carbon dioxide, which results in the inability to further improve and optimize the energy storage process and system, and the inability to eliminate the adverse effects of impurities enriched in carbon dioxide on the system. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a carbon dioxide phase change energy storage and release method and system to solve the technical problem that the existing carbon dioxide phase change energy storage and release system has adverse effects on the system due to the accumulation of impurities during operation.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] Provided is a carbon dioxide phase change energy storage and release method, the energy storage and release method comprising a condensation stage and a vaporization stage, and a gas phase carbon dioxide purification process;

[0008] In the condensation stage, the high-pressure gas phase carbon dioxide is converted into liquid phase carbon dioxide through the first phase change conversion element; in the vaporization stage, the liquid phase carbon dioxide is converted into gas phase carbon dioxide through the second phase change conversion element;

[0009] After the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide; wherein the impurities are of one or more types.

[0010] In some embodiments, after the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide, including:

[0011] The gas phase carbon dioxide purification process is performed using a plurality of different purification components to remove a plurality of the impurities; wherein different purification components purify different types of the impurities, and the plurality of different purification components are arranged in the same container or in a plurality of containers sequentially arranged along the flow path of the gas phase carbon dioxide;

[0012] Alternatively, the gas-phase carbon dioxide purification process is performed using a plurality of identical purification components to remove the same type of impurities multiple times; wherein the plurality of identical purification components are arranged in the same container or in a plurality of containers sequentially arranged along the flow path of the gas-phase carbon dioxide.

[0013] In some embodiments, the impurities include at least solid impurities and liquid impurities;

[0014] The gas phase carbon dioxide purification process at least includes a solid purification process and a liquid purification process;

[0015] The gas phase carbon dioxide purification process using a plurality of different purification components to remove a plurality of impurities includes:

[0016] Firstly, the solid purification process is performed using a first purification component to remove the solid impurities;

[0017] The second purification component is then used to perform the liquid purification process to remove the liquid impurities.

[0018] In some embodiments, the solid purification process is first performed using a first purification component to remove the solid impurities, including:

[0019] Firstly, the first purification component is used to provide centrifugal force and the solid impurities are separated from the gas phase carbon dioxide by using the centrifugal force;

[0020] The solid impurities are then discharged from the first purification component along the direction of the self-gravity by utilizing the self-gravity of the solid impurities.

[0021] In some embodiments, the reusing of the second purification component to perform the liquid purification process to remove the liquid impurities includes:

[0022] First, the liquid impurities are separated from the gaseous carbon dioxide by utilizing the material properties of the second purification component;

[0023] The liquid impurities are then gathered along the direction of the self-gravity by utilizing their own gravity and then discharged from the second purification component.

[0024] In some embodiments, the gas phase carbon dioxide purification process using multiple different purification components to remove multiple impurities includes:

[0025] The solid impurities and the liquid impurities are purified in sequence along a direction opposite to gravity using a plurality of different purification components in the same purification device.

[0026] In some embodiments, the liquid impurities include at least one of water and oil;

[0027] The solid impurities include at least one of metal rust powder, abrasion powder, environmental dust, inorganic powder, and droplet metal powder.

[0028] In some embodiments, the energy storage and release method comprises a pressure increase stage and a condensation stage arranged in sequence;

[0029] In the pressurization stage, the low-pressure gaseous carbon dioxide is at least compressed to obtain high-pressure gaseous carbon dioxide, and the high-pressure gaseous carbon dioxide enters the condensation stage after the gaseous carbon dioxide purification process.

[0030] The beneficial effects of the carbon dioxide phase change energy storage and release method provided in this application are:

[0031] Compared with the prior art, the carbon dioxide phase change energy storage and release method provided by the present application is that in the condensation stage, high-pressure gas phase carbon dioxide is converted into liquid phase carbon dioxide through the first phase change conversion element; in the vaporization stage, liquid phase carbon dioxide is converted into gas phase carbon dioxide through the second phase change conversion element; after the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide; wherein the types of impurities are one or more. In this way, the impurities in the gas phase carbon dioxide can be purified in a targeted manner through the gas phase carbon dioxide purification process, achieving precise impurity removal of precise objects, reducing and eliminating the adverse effects of impurities on various equipment and pipelines of the energy storage and release system, and making the energy storage and release system more perfect and optimized.

[0032] Another object of the present application is to provide a carbon dioxide phase change energy storage and release system, the energy storage and release system comprising a condensation component and a vaporization component, and a purification device;

[0033] The condensation assembly comprises a first phase-change conversion element and a liquid storage element connected to each other, wherein the first phase-change conversion element is used to convert high-pressure gas-phase carbon dioxide into liquid-phase carbon dioxide, and the liquid storage element is used to store the liquid-phase carbon dioxide;

[0034] The vaporization component includes a second phase change conversion element, and the second phase change conversion element is used to convert the liquid phase carbon dioxide into gas phase carbon dioxide;

[0035] The purification device is connected between the first phase change conversion element and the second phase change conversion element, and is used to perform a gas phase carbon dioxide purification process to remove impurities in the gas phase carbon dioxide; wherein the impurities are of one or more types.

[0036] In some embodiments, the purification device comprises a container and a plurality of different purification components, and the plurality of different purification components are disposed in the container;

[0037] Or, the purification device comprises a plurality of containers and a plurality of different purification components, the plurality of different purification components are respectively arranged in the plurality of containers, and the plurality of containers are arranged in sequence along the flow path of the gaseous carbon dioxide;

[0038] Wherein, a plurality of different purification components are used to purify different types of impurities.

[0039] In some embodiments, the purification device comprises a container and a plurality of identical purification components, wherein the plurality of identical purification components are disposed in the container;

[0040] Or, the purification device comprises a plurality of containers and a plurality of identical purification components, the plurality of identical purification components are respectively arranged in the plurality of containers, and the plurality of containers are sequentially arranged along the flow path of the gaseous carbon dioxide;

[0041] Wherein, a plurality of identical purification components are used to purify the same type of impurities multiple times.

[0042] In some embodiments, the purification device includes a first container and a first purification component disposed in the first container;

[0043] An air inlet and a solid discharge port are provided on the wall of the first container. The air inlet is used to allow the gaseous carbon dioxide to pass through, and the solid discharge port is used to discharge solid impurities. The first purification component is used to separate the solid impurities from the gaseous carbon dioxide to form a primary purified gas.

[0044] In some embodiments, the purification device includes a second container directly or indirectly connected to the first container, and a second purification component disposed in the second container;

[0045] A liquid discharge port is provided on the wall of the second container, and the liquid discharge port is used to discharge liquid impurities. The second purification component is used to separate the liquid impurities from the primary purified gas to form a secondary purified gas.

[0046] In some embodiments, the purification device includes a third container directly or indirectly connected to the second container, and a third purification component disposed in the third container;

[0047] An exhaust port is provided on the wall of the third container, and the exhaust port is connected to the first phase change conversion element. The third purification component is used to purify the secondary purification gas, and the exhaust port is used to discharge the gas passing through the first purification component, the second purification component and the third purification component.

[0048] In some embodiments, the first purification component includes a centrifugal force provider;

[0049] The air inlet and the solid discharge port are arranged in order from top to bottom, and the centrifugal force providing member is arranged between the air inlet and the solid discharge port; the centrifugal force providing member is coaxial with the first container and is configured to be able to rotate relative to the first container to provide centrifugal force, so that at least part of the solid impurities in the gas phase carbon dioxide are separated by the centrifugal force and discharged from the solid discharge port by gravity.

[0050] In some embodiments, the first purification component further comprises a solid impurity filter and an air guide pipe, wherein the air guide pipe is coaxially arranged at the center of the centrifugal force providing member;

[0051] One port of the air guide pipe is arranged on the outside of the first container, the other port of the air guide pipe is arranged between the centrifugal force providing component and the solid discharge port, the solid impurity filter is arranged on the other port, and the solid impurity filter is used to filter part of the solid impurities in the gas phase carbon dioxide.

[0052] In some embodiments, the second purification component includes a partition component and a first liquid guiding tube;

[0053] The partition component divides the second container into a secondary separation front zone and a secondary separation rear zone. The projection of the partition component along the axial direction of the second container covers the cross-section of the second container. At least a portion of the partition component is configured to separate liquid impurities from the primary purified gas to form the secondary purified gas. One port of the first liquid guiding pipe is connected to the partition component, and the other port is directly or indirectly connected to the liquid discharge port.

[0054] In some embodiments, the partition assembly includes a first liquid impurity separator, a first separator, and a second separator;

[0055] The first liquid impurity separator is arranged on any central axis surface of the second container and connected to the walls on opposite sides of the central axis surface; the first liquid impurity separator is provided with the first partition at the top, part of the edge of the first partition is connected to the top, and the other part of the edge is connected to the wall of the second container; the second partition is provided at the bottom end of the first liquid impurity separator, part of the edge of the second partition is connected to the bottom, and the other part of the edge is connected to the wall of the second container;

[0056] The first partition and the second partition are respectively located on both sides of the first liquid impurity separator, a port of the first liquid conduit is connected to the second partition, and the liquid impurities separated by the first liquid impurity separator enter the first liquid conduit through the surface of the second partition.

[0057] In some embodiments, the partition assembly further includes a second liquid impurity separator and a second liquid guide tube, and a third partition plate;

[0058] The second liquid impurity separator and the first liquid impurity separator are arranged in sequence in the longitudinal direction and in the same plane, the third partition is provided at the top of the second liquid impurity separator, a part of the edge of the third partition is connected to the top, and another part of the edge is connected to the wall of the second container;

[0059] One end of the second liquid-conducting tube is connected to the first partition plate, and the other end of the second liquid-conducting tube is directly or indirectly connected to the liquid discharge port.

[0060] In some embodiments, the second purification component further includes a liquid collecting plate, the liquid collecting plate is arranged below the partition component, an air guide pipe is plugged into the liquid collecting plate, and the air guide pipe connects the first container and the second container;

[0061] The other ends of the first liquid guiding pipe member and the second liquid guiding pipe member face the liquid collecting plate, and are used to transport the liquid impurities to the liquid collecting plate. The height of the liquid discharge port is higher than the height of the liquid collecting plate.

[0062] In some embodiments, the third purification assembly includes a mounting plate and a plurality of purification elements;

[0063] The mounting plate is provided with a plurality of mounting holes, the plurality of purification elements are respectively arranged in the plurality of mounting holes, and the plurality of purification elements are arranged in the third container; the surface of the purification element is provided with adsorption material, the purification element is provided with a gas channel, and the gas channel is connected to the third container.

[0064] In some embodiments, the energy storage and release system includes a plurality of gas phase pipe sections for flowing the gas phase carbon dioxide;

[0065] The first container, the second container and the third container are integrally connected, and the purification device is arranged on any of the gas phase pipe sections;

[0066] Or, the first container, the second container and the third container are separately arranged, and the three are arranged in sequence along the flow path of the gas-phase carbon dioxide and are located on any of the gas-phase pipe sections;

[0067] Alternatively, the first container, the second container and the third container are separately arranged, and the three are arranged in sequence along the flow path of the gas-phase carbon dioxide and are respectively located on different gas-phase pipe sections.

[0068] In some embodiments, the energy storage and release system includes a work-doing and pressure-reducing component and a pressure-boosting component, wherein the work-doing and pressure-reducing component is connected between the second phase-change converter and the pressure-boosting component, and the pressure-boosting component is connected between the work-doing and pressure-reducing component and the first phase-change converter; the work-doing and pressure-reducing component is used to utilize the gas phase carbon dioxide to do work and release its pressure into low-pressure gas phase carbon dioxide, and the pressure-boosting component is used to obtain high-pressure gas phase carbon dioxide after at least compression of the low-pressure gas phase carbon dioxide;

[0069] Wherein, at least one of the work-doing pressure-reducing component and the pressure-increasing component comprises the purification device.

[0070] In some embodiments, the work-making pressure-reducing component includes a second heat exchange component, a heat storage container, a turbine, and a gas storage reservoir; the pressure-increasing component includes a compressor and a first heat exchange component;

[0071] The second phase-change conversion element, the second heat exchange element, the turbine, the gas storage, the compressor, the first heat exchange element, the first phase-change conversion element, and the liquid storage element are connected in sequence, and the heat storage container is connected between the first heat exchange element and the second heat exchange element;

[0072] The purification device is arranged on the gas phase pipe section between the first heat exchange element and the first phase change conversion element, or on the gas phase pipe section between the second phase change conversion element and the second heat exchange element, or on the gas phase pipe section between the second heat exchange element and the turbine.

[0073] The beneficial effects of the carbon dioxide phase change energy storage and release system provided in the present application compared to the prior art are consistent with the beneficial effects of the carbon dioxide phase change energy storage and release method provided in the present application compared to the prior art, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0075] Figure 1 A framework diagram of the carbon dioxide phase change energy storage and release method provided in the embodiment of the present application;

[0076] Figure 2 A framework diagram of the carbon dioxide phase change energy storage and release method provided in the embodiment of the present application;

[0077] Figure 3 A flow chart of the carbon dioxide phase change energy storage and release method provided in an embodiment of the present application;

[0078] Figure 4 A flow chart of the carbon dioxide phase change energy storage and release method provided in an embodiment of the present application;

[0079] Figure 5 A schematic diagram of a purification device provided in an embodiment of the present application, wherein the first container, the second container and the third container are integrally formed;

[0080] Figure 6 A schematic diagram of a carbon dioxide phase change energy storage and release system provided in an embodiment of the present application;

[0081] Figure 7 This is an axial schematic diagram of a partition assembly provided in one embodiment of the present application.

[0082] Among them, the reference numerals in the figure are:

[0083] 1000, purification device; 2000, condensation component; 3000, vaporization component; 4000, work-making pressure-reducing component; 5000, pressure-boosting component;

[0084] 100, first purification component; 200, second purification component; 300, third purification component;

[0085] 101, first container; 102, air inlet; 103, solid discharge port; 104, centrifugal force providing member; 105, filter member; 106, air guide member; 107, dust collecting member; 1061, one port; 1062, another port; 1071, upper edge; 1072, lower edge;

[0086] 201, liquid discharge port; 202, partition assembly; 2031, first liquid guide pipe; 2032, second liquid guide pipe; 204, liquid collecting plate; 2051, first liquid impurity separator; 2052, second liquid impurity separator; 2061, first partition plate; 2062, second partition plate; 2063, third partition plate; 207, secondary separation front area; 208, detour area; 209, secondary separation rear area; 2010, second container;

[0087] 301, exhaust port; 302, mounting plate; 303, purification element; 304, third container;

[0088] 2001, first phase change conversion element; 2002, liquid storage element;

[0089] 3001, carburetor;

[0090] 4001, second heat exchange element; 4002, heat storage container; 4003, turbine; 4004, gas storage;

[0091] 5001. Compressor; 5002. First heat exchange element. DETAILED DESCRIPTION

[0092] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0093] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0094] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0095] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0096] It is found in engineering practice that with the continuous increase of the actual production and operation time of the gas-liquid two-phase carbon dioxide energy storage system, a certain amount of impurities will gradually accumulate in the carbon dioxide as the circulating working fluid. These impurities are mainly metal rust, abrasive powder, environmental dust, moisture and grease organic components. The gradually enriched impurities will have potential negative impacts and risks on the liquefaction of carbon dioxide working fluid, the corrosion resistance of equipment and pipelines of the energy storage system, and the wear of mechanical kinetic energy equipment. It is necessary to adopt targeted impurity removal technology to improve and optimize its process and system to eliminate the adverse effects of enriched impurities.

[0097] In response to this technical problem, the embodiments of the present application provide a carbon dioxide phase change energy storage and release method and system, which can achieve comprehensive separation and discharge of solid, liquid and gas substances in gaseous carbon dioxide, reduce and eliminate the adverse effects of impurities on the liquefaction of carbon dioxide working fluid, the corrosion resistance of equipment and pipelines of the energy storage and release system, and weaken and eliminate the wear effect on mechanical kinetic energy equipment, thereby making the energy storage and release system more complete and optimized.

[0098] The carbon dioxide phase change energy storage and release method and system provided in the embodiments of the present application are now described.

[0099] like Figure 1 As shown, the carbon dioxide phase change energy storage and release method provided in the embodiment of the present application includes a condensation stage and a vaporization stage, as well as a gas phase carbon dioxide purification process. In the condensation stage, the high pressure gas phase carbon dioxide is converted into liquid phase carbon dioxide by the first phase change conversion element 2001; in the vaporization stage, the liquid phase carbon dioxide is converted into gas phase carbon dioxide by the second phase change conversion element.

[0100] After the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide; wherein the impurities are of one or more types. In this way, the impurities in the gas phase carbon dioxide can be purified in a targeted manner through the gas phase carbon dioxide purification process, achieving precise impurity removal of precise objects, reducing and eliminating the adverse effects of impurities on various equipment and pipelines of the energy storage and release system, making the energy storage and release system more perfect and optimized.

[0101] Among them, Figure 1 and Figure 2As shown, the gas phase carbon dioxide purification process can be arranged between the pressure increasing stage and the condensation stage, or in the pressure increasing stage, or between the vaporization stage and the working pressure reducing stage, or in the working pressure reducing stage.

[0102] In some embodiments, the above-mentioned gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide after the vaporization stage and before the condensation stage, including:

[0103] A gas phase carbon dioxide purification process is performed using a plurality of different purification components to remove a variety of impurities; wherein different purification components purify different types of impurities, and the plurality of different purification components are arranged in the same container or in a plurality of containers arranged in sequence along the flow path of the gas phase carbon dioxide;

[0104] Alternatively, a plurality of identical purification components are used to perform a gas phase carbon dioxide purification process to remove the same type of impurities multiple times; wherein the plurality of identical purification components are arranged in the same container or in a plurality of containers sequentially arranged along the flow path of the gas phase carbon dioxide.

[0105] For example, the impurities may include solid impurities, liquid impurities, and gaseous impurities. Different purification components may include a first purification component 100, a second purification component 200, and a third purification component 300. The first purification component 100, the second purification component 200, and the third purification component 300 may purify solid impurities, liquid impurities, and gaseous impurities, respectively. The purification order may be randomly set, for example, solid impurities, liquid impurities, and gaseous impurities may be purified in a sequential order. This embodiment does not impose specific restrictions on the specific purification order.

[0106] Among them, the first purification component 100, the second purification component 200 and the third purification component 300 can be arranged in the same container, and the container can be arranged between the pressure boosting stage and the condensation stage, or in the pressure boosting stage, or between the vaporization stage and the work-doing pressure reduction stage, or in the work-doing pressure reduction stage.

[0107] Alternatively, two of the first purification component 100, the second purification component 200 and the third purification component 300 can be arranged in a container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. Another component is arranged in another container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. In other words, one container and the other container can be in the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. For example, one container can be between the boost stage and the condensation stage, and the other container can be in the boost stage. One container and the other container are not restricted by the other, and either of them can be randomly arranged in the above-mentioned multiple positions.

[0108] Alternatively, the first purification component 100, the second purification component 200 and the third purification component 300 are respectively arranged in the first container 101, the second container 2010 and the third container 304. Any one of the first container 101, the second container 2010 and the third container 304 can be arranged between the pressure-increasing stage and the condensing stage, or in the pressure-increasing stage, or between the vaporization stage and the work-doing pressure-reducing stage, or in the work-doing pressure-reducing stage. In other words, the first container 101, the second container 2010 and the third container 304 can be arranged between the pressure-increasing stage and the condensing stage, or in the pressure-increasing stage, or between the vaporization stage and the work-doing pressure-reducing stage, or in the work-doing pressure-reducing stage. It can also be that the first container 101 is between the pressure-increasing stage and the condensing stage, the second container 2010 is in the pressure-increasing stage, and the third container 304 is in the work-doing pressure-reducing stage. Any one of the first container 101, the second container 2010 and the third container 304 is not restricted by the other two, and any one of the three can be randomly set in the above-mentioned multiple positions.

[0109] Among them, multiple identical purification components can be used to carry out the gas phase carbon dioxide purification process so as to remove the same type of impurities multiple times.

[0110] For example, multiple identical purification components can be arranged in the same container, and the container can be arranged between the pressure increasing stage and the condensation stage, or in the pressure increasing stage, or between the vaporization stage and the work-generating pressure reducing stage, or in the work-generating pressure reducing stage.

[0111] Alternatively, part of the multiple identical purification components can be arranged in a container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. Another part of the multiple identical purification components is arranged in another container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. That is to say, either one of the container and the other container can be between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. For example, one container can be between the boost stage and the condensation stage, and the other container can be in the boost stage. One container and the other container are not restricted by the other, and either of them can be randomly arranged in the above-mentioned multiple positions.

[0112] Alternatively, multiple identical purification components are respectively arranged in the first container 101, the second container 2010 and the third container 304. Any one of the first container 101, the second container 2010 and the third container 304 can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. In other words, the first container 101, the second container 2010 and the third container 304 can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. It can also be that the first container 101 is between the boost stage and the condensation stage, the second container 2010 is in the boost stage, and the third container 304 is in the work decompression stage. Any one of the first container 101, the second container 2010 and the third container 304 is not restricted by the other two, and any one of the three can be randomly arranged in the above-mentioned multiple positions.

[0113] In some embodiments, the impurities include at least solid impurities and liquid impurities; the gas-phase carbon dioxide purification process includes at least a solid purification process and a liquid purification process.

[0114] Reference Figure 3 As shown, the above-mentioned gas phase carbon dioxide purification process using multiple different purification components can remove various impurities, including:

[0115] S101. First, a solid purification process is performed using the first purification component 100 to remove solid impurities;

[0116] S102. Reuse the second purification component 200 to perform a liquid purification process to remove liquid impurities.

[0117] Reference Figure 4 As shown, in some embodiments, the solid purification process is first performed using the first purification component 100 to remove solid impurities, including:

[0118] S1011. First, the first purification component 100 is used to provide centrifugal force and the solid impurities are separated from the gas phase carbon dioxide by centrifugal force;

[0119] S1012. The solid impurities are then discharged from the first purification component 100 in the direction of their own gravity by utilizing their own gravity.

[0120] Reference Figure 4 As shown, in some embodiments, the above-mentioned second purification component 200 is reused to perform a liquid purification process to remove liquid impurities, including:

[0121] S1021. First, the material properties of the second purification component 200 are used to separate liquid impurities from the gas phase carbon dioxide;

[0122] S1022. The liquid impurities are then gathered in the direction of their own gravity by utilizing their own gravity and then discharged from the second purification component 200.

[0123] In some embodiments, the above-mentioned gas phase carbon dioxide purification process using multiple different purification components to remove multiple impurities includes:

[0124] A plurality of different purification components in the same purification device 1000 are used to purify solid impurities and liquid impurities in sequence in a direction opposite to gravity.

[0125] For example, the first purification component 100, the second purification component 200 and the third purification component 300 can be arranged in the same container. The first purification component 100, the second purification component 200 and the third purification component 300 are arranged in sequence in the direction opposite to gravity, and can purify solid impurities, liquid impurities, and gaseous impurities in sequence.

[0126] In some embodiments, the liquid impurities include at least one of water and oil;

[0127] The solid impurities include at least one of metal rust powder, abrasion powder, environmental dust, inorganic powder, and droplet metal powder.

[0128] In some embodiments, the energy storage and release method includes a pressurization stage and a condensation stage arranged in sequence;

[0129] In the pressure-increasing stage, the low-pressure gaseous carbon dioxide is at least compressed to obtain high-pressure gaseous carbon dioxide, and the high-pressure gaseous carbon dioxide enters the condensation stage after the gaseous carbon dioxide purification process. That is, the gaseous carbon dioxide purification process is set between the pressure-increasing stage and the condensation stage.

[0130] The gas phase carbon dioxide purification process is arranged between the pressure increasing stage and the condensation stage, and multiple different purification components may be arranged in the same container, and the container is arranged between the pressure increasing stage and the condensation stage. Alternatively, multiple different purification components may be arranged in different containers, and the multiple different containers are arranged between the pressure increasing stage and the condensation stage.

[0131] Another purpose of the embodiment of the present application is to provide a carbon dioxide phase change energy storage and release system. The energy storage and release system includes a condensation component 2000, a vaporization component 3000, and a purification device 1000. The condensation component 2000 includes a first phase change conversion component 2001 and a liquid storage component 2002 connected to each other, the first phase change conversion component 2001 is used to convert high-pressure gas phase carbon dioxide into liquid phase carbon dioxide, and the liquid storage component 2002 is used to store liquid phase carbon dioxide; the vaporization component 3000 includes a second phase change conversion component, and the second phase change conversion component is used to convert liquid phase carbon dioxide into gas phase carbon dioxide.

[0132] The purification device 1000 is connected between the first phase change converter 2001 and the second phase change converter, and is used to perform a gas phase carbon dioxide purification process to remove impurities in the gas phase carbon dioxide; wherein the impurities may be of one or more types.

[0133] After the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide. In this way, the impurities in the gas phase carbon dioxide can be purified in a targeted manner through the gas phase carbon dioxide purification process, achieving precise removal of impurities for precise objects, reducing and eliminating the adverse effects of impurities on various equipment and pipelines of the energy storage and release system, making the energy storage and release system more perfect and optimized.

[0134] In some embodiments, the purification device 1000 includes a container and a plurality of different purification components, and the plurality of different purification components are disposed in the container. Alternatively, the purification device 1000 includes a plurality of containers and a plurality of different purification components, and the plurality of different purification components are disposed in the plurality of containers, respectively, and the plurality of containers are sequentially disposed along the flow path of the gas phase carbon dioxide; wherein the plurality of different purification components are used to purify different types of impurities.

[0135] In some embodiments, the purification device 1000 includes a container and a plurality of identical purification components, and the plurality of identical purification components are all disposed in the container. Alternatively, the purification device 1000 includes a plurality of containers and a plurality of identical purification components, and the plurality of identical purification components are disposed in a plurality of containers, respectively, and the plurality of containers are sequentially arranged along the flow path of the gas phase carbon dioxide. The plurality of identical purification components are used to purify the same type of impurities multiple times.

[0136] For example, the impurities may include solid impurities, liquid impurities, and gaseous impurities. Different purification components may include a first purification component 100, a second purification component 200, and a third purification component 300. The first purification component 100, the second purification component 200, and the third purification component 300 may purify solid impurities, liquid impurities, and gaseous impurities, respectively. The purification order may be randomly set, for example, solid impurities, liquid impurities, and gaseous impurities may be purified in a sequential order. This embodiment does not impose specific restrictions on the specific purification order.

[0137] Among them, the first purification component 100, the second purification component 200 and the third purification component 300 can be arranged in the same container, and the container can be arranged between the pressure boosting stage and the condensation stage, or in the pressure boosting stage, or between the vaporization stage and the work-doing pressure reduction stage, or in the work-doing pressure reduction stage.

[0138] Alternatively, two of the first purification component 100, the second purification component 200 and the third purification component 300 can be arranged in a container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. Another component is arranged in another container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. In other words, one container and the other container can be in the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. For example, one container can be between the boost stage and the condensation stage, and the other container can be in the boost stage. One container and the other container are not restricted by the other, and either of them can be randomly arranged in the above-mentioned multiple positions.

[0139] Alternatively, the first purification component 100, the second purification component 200 and the third purification component 300 are respectively arranged in the first container 101, the second container 2010 and the third container 304. Any one of the first container 101, the second container 2010 and the third container 304 can be arranged between the pressure-increasing stage and the condensing stage, or in the pressure-increasing stage, or between the vaporization stage and the work-doing pressure-reducing stage, or in the work-doing pressure-reducing stage. In other words, the first container 101, the second container 2010 and the third container 304 can be arranged between the pressure-increasing stage and the condensing stage, or in the pressure-increasing stage, or between the vaporization stage and the work-doing pressure-reducing stage, or in the work-doing pressure-reducing stage. It can also be that the first container 101 is between the pressure-increasing stage and the condensing stage, the second container 2010 is in the pressure-increasing stage, and the third container 304 is in the work-doing pressure-reducing stage. Any one of the first container 101, the second container 2010 and the third container 304 is not restricted by the other two, and any one of the three can be randomly set in the above-mentioned multiple positions.

[0140] Among them, multiple identical purification components can be used to carry out the gas phase carbon dioxide purification process so as to remove the same type of impurities multiple times.

[0141] For example, multiple identical purification components can be arranged in the same container, and the container can be arranged between the pressure increasing stage and the condensation stage, or in the pressure increasing stage, or between the vaporization stage and the work-generating pressure reducing stage, or in the work-generating pressure reducing stage.

[0142] Alternatively, part of the multiple identical purification components can be arranged in a container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. Another part of the multiple identical purification components is arranged in another container, which can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. That is to say, either one of the container and the other container can be between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. For example, one container can be between the boost stage and the condensation stage, and the other container can be in the boost stage. One container and the other container are not restricted by the other, and either of them can be randomly arranged in the above-mentioned multiple positions.

[0143] Alternatively, multiple identical purification components are respectively arranged in the first container 101, the second container 2010 and the third container 304. Any one of the first container 101, the second container 2010 and the third container 304 can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. In other words, the first container 101, the second container 2010 and the third container 304 can be arranged between the boost stage and the condensation stage, or in the boost stage, or between the vaporization stage and the work decompression stage, or in the work decompression stage. It can also be that the first container 101 is between the boost stage and the condensation stage, the second container 2010 is in the boost stage, and the third container 304 is in the work decompression stage. Any one of the first container 101, the second container 2010 and the third container 304 is not restricted by the other two, and any one of the three can be randomly arranged in the above-mentioned multiple positions.

[0144] Reference Figure 5 As shown, in some embodiments, the purification device 1000 includes a first container 101 and a first purification component 100 arranged in the first container 101; an air inlet 102 and a solid discharge port 103 are provided on the wall of the first container 101, the air inlet 102 is used to introduce gaseous carbon dioxide, and the solid discharge port 103 is used to discharge solid impurities, and the first purification component 100 is used to separate solid impurities from gaseous carbon dioxide to form a primary purified gas.

[0145] In some embodiments, the purification device 1000 includes a second container 2010 directly or indirectly connected to the first container 101, and a second purification component 200 disposed in the second container 2010. A drain port 201 is disposed on the wall of the second container 2010, and the drain port 201 is used to discharge liquid impurities. The second purification component 200 is used to separate liquid impurities from the primary purified gas to form a secondary purified gas.

[0146] In some embodiments, the purification device 1000 includes a third container 304 directly or indirectly connected to the second container 2010, and a third purification component 300 disposed in the third container 304. An exhaust port 301 is disposed on the wall of the third container 304, and the exhaust port 301 is connected to the first phase change converter 2001. The third purification component 300 is used to purify the secondary purification gas, and the exhaust port 301 is used to discharge the gas passing through the first purification component 100, the second purification component 200 and the third purification component 300.

[0147] Among them, the first purification component 100 refers to a component that is arranged in the first container 101 and can separate solid impurities from the gaseous carbon dioxide. It can be configured in the first container 101 in any way, including but not limited to using centripetal force, centrifugal force, gravity, etc. to separate solid impurities from the gaseous carbon dioxide. For example, the gaseous carbon dioxide can be carbon dioxide gas, and the solid impurities include but are not limited to metal rust particles, wear particles of system equipment and pipelines or mechanical kinetic energy equipment, or environmental dust particles entering the system, etc.

[0148] The air inlet 102 and the solid discharge port 103 refer to an opening structure that penetrates the wall thickness of the first container 101. The gas entering through the air inlet 102 can reach a position or space higher than the solid discharge port 103 for separation, and the separated solid impurities are discharged through the solid discharge port 103. Alternatively, the height of the air inlet 102 can be higher than the solid discharge port 103, the position of the first purification component 100 can be higher than the air inlet 102 and the solid discharge port 103, or at least part of the first purification component 100 is arranged in the area between the air inlet 102 and the solid discharge port 103.

[0149] Among them, the second purification component 200 refers to a component arranged in the second container 2010 and capable of separating liquid impurities from the primary purified gas. It can be configured in the second container 2010 in any manner, including but not limited to using filters, demisters, liquid precipitation materials, etc. to separate liquid impurities from the primary purified gas. For example, gaseous carbon dioxide can be carbon dioxide gas, and liquid impurities include but are not limited to water or oily organic components.

[0150] The drain port 201 refers to an opening structure that penetrates the thickness of the wall of the second container 2010. The height of the second purification component 200 and the drain port 201 can be consistent, and the liquid impurities separated by the second purification component 200 can flow and be discharged through the drain port 201 at the same height. Alternatively, the height of the second purification component 200 is higher than the height of the drain port 201, and gravity can be used to discharge the liquid impurities through the drain port 201.

[0151] The exhaust port 301 refers to an opening structure that penetrates the thickness of the wall of the second container 2010. The liquid impurities separated by the second purification component 200 can flow and be discharged through the discharge port 201 at the same height. At least the gas that passes through the first purification component 100 and the second purification component 200 in sequence is discharged through the exhaust port 301 at the same height. A barrier structure that allows gas to be discharged but prevents liquid from being discharged is provided in the exhaust port 301. Alternatively, the height of the exhaust port 301 is higher than the height of the discharge port 201, and gravity can be used to discharge the liquid impurities through the discharge port 201, while at least the gas that passes through the first purification component 100 and the second purification component 200 in sequence is discharged upward through the exhaust port 301.

[0152] The third purification component 300 refers to a component that is arranged in the third container 304 and is capable of further filtering at least one of the liquid substances or solid impurities remaining in the secondary purified gas. It can be configured in the third container 304 in any manner, including but not limited to further purifying the secondary purified gas using one or more of solid filtrate, liquid filtrate, demister, and adsorption material.

[0153] By setting up the third purification component 300, the secondary purified gas after the secondary separation is further purified, so that the purification degree of the gas discharged from the exhaust port 301 is further improved, that is, the purity of the gas entering the next section is higher, and the adverse effects of impurities on the liquefaction of carbon dioxide working fluid, the corrosion resistance of equipment and pipelines of the energy storage and release system are further reduced and eliminated, and the wear effect on mechanical kinetic energy equipment is weakened and eliminated, making the energy storage and release system more perfect and optimized.

[0154] Among them, the first purification component 100 is arranged in the first container 101, and the wall of the first container 101 is provided with an air inlet 102 and a solid discharge port 103. The gaseous carbon dioxide enters the first container 101 from the air inlet 102. The first purification component 100 separates solid impurities from the gaseous carbon dioxide to form a primary purified gas. The primary purified gas can enter the second container 2010 through the connecting point. The separated solid impurities are discharged from the first container 101 through the solid discharge port 103 and then discharged from the first container 101. In this way, the separation and discharge of solid impurities are completed in the first container 101.

[0155] Among them, the second purification component 200 is arranged in the second container 2010, and a drain port 201 is provided on the wall of the second container 2010. The primary purified gas entering the second container 2010 is separated from liquid impurities by the second purification component 200 to form a secondary purified gas. The separated liquid impurities are discharged from the second container 2010 through the drain port 201, so that the separation and discharge of liquid impurities are completed in the second container 2010.

[0156] The third container 304 has an exhaust port 301 on its wall, and the exhaust port 301 can discharge the gas purified by at least the first purification component 100 , the second purification component 200 , and the third purification component 300 in sequence.

[0157] Different purification components are used to separate and discharge impurities in different forms, so that solid impurities, liquid impurities and gaseous substances contained in the gas phase carbon dioxide can be separated and discharged using different containers respectively, which can not only realize comprehensive separation of solid, liquid and gaseous substances, but also realize separate separation and discharge of solid, liquid and gaseous substances, realizing comprehensive and high-precision separation and discharge of impurities, reducing and eliminating the adverse effects of impurities on the liquefaction of carbon dioxide working fluid, the corrosion resistance of equipment and pipelines of the energy storage and release system, and weakening and eliminating the wear effect on mechanical kinetic energy equipment, making the energy storage and release system more perfect and optimized.

[0158] In some embodiments, the first purification component 100 includes a centrifugal force providing member 104. The air inlet 102 and the solid discharge port 103 are arranged in order from top to bottom, and the centrifugal force providing member 104 is arranged between the air inlet 102 and the solid discharge port 103; the centrifugal force providing member 104 is coaxial with the first container 101 and is configured to be able to rotate relative to the first container 101 to provide centrifugal force, so that at least part of the solid impurities in the gas phase carbon dioxide are separated by centrifugal force and discharged from the solid discharge port 103 by gravity.

[0159] The centrifugal force providing component 104 refers to a component that can provide centrifugal force, for example, it can be a device including multiple blades, for example, it can be a cyclone fan, and a gap is set between the end of the blade and the wall of the third container 304. There is a gap between any two adjacent blades. Solid impurities can be separated through the two gaps and reach the solid discharge port 103.

[0160] The centrifugal force providing component 104 can generate centrifugal force, causing the airflow to flow downward in a spiral relative to the first container 101. The gas entering through the air inlet 102 passes through the centrifugal force providing component 104, and at least part of the solid impurities therein are separated by the centrifugal force and fall into the bottom of the first container 101 through the above-mentioned gap. The separated gas is in the space where the centrifugal force providing component 104 is located, and can directly reach the second container 2010 through the connecting point, or enter the second container 2010 after further separation.

[0161] In some embodiments, the first purification component 100 also includes a solid impurity filter 105 and an air guide pipe 106, and the air guide pipe 106 is coaxially arranged at the center of the centrifugal force providing component 104; one port of the air guide pipe 106 is arranged on the outside of the first container 101, and the other port of the air guide pipe 106 is arranged between the centrifugal force providing component 104 and the solid discharge port 103, and the solid impurity filter 105 is arranged on the other port, and the solid impurity filter 105 is used to filter some solid impurities in the gaseous carbon dioxide.

[0162] The solid impurity filter 105 may be a wire mesh filter bed or a filter plate, for example, a wire mesh filter bed composed of multiple layers of stacked metal wires, and the metal wires may be stainless steel wires.

[0163] The solid impurities in the gas are further filtered through the solid impurity filter 105 to ensure that the solid impurities are separated to the greatest extent, and further improve the purity of the gas discharged from the third container 304. The gas passing through the solid impurity filter 105 enters the second container 2010 through the gas guide 106, and the liquid substances are separated and discharged in the second container 2010.

[0164] In some embodiments, the first purification component 100 further includes a dust collecting member 107, which is disposed below the centrifugal force providing member 104. The dust collecting member 107 is in an inverted cone shape, an upper edge 1071 of the dust collecting member 107 is connected to the wall of the first container 101, a lower edge 1072 of the dust collecting member 107 is connected to the bottom wall of the first container 101, and the solid discharge port 103 is disposed at the center of the bottom wall and on the inner side of the lower edge 1072.

[0165] The bottom of the first container 101 is in an arc or semi-elliptical shape, and the line shape of its wall from top to bottom is a curve shape, which easily accumulates solid impurities inside the curve, affecting the solid impurities from smoothly reaching the solid discharge port 103 for discharge. The dust collecting member 107 is in an inverted cone shape, and the line shape of its inner wall from top to bottom is a straight line shape, so that solid impurities can smoothly enter the lower side from the upper side and enter the solid discharge port 103 through gravity, and then be smoothly discharged from the solid discharge port 103.

[0166] In some embodiments, the second purification component 200 includes a partition component 202 and a first liquid guiding tube 2031; the partition component 202 divides the second container 2010 into a secondary separation front area 207 and a secondary separation rear area 209, the projection of the partition component 202 along the axial direction of the second container 2010 covers the cross-section of the second container 2010, at least a portion of the partition component 202 is configured to separate liquid impurities from the primary purified gas to form a secondary purified gas, one port of the first liquid guiding tube 2031 is connected to the partition component 202, and the other port is directly or indirectly connected to the drain port 201.

[0167] In order to ensure that the gas entering the third container 304 is separated by liquid, the second container 2010 is separated into a secondary separation front zone 207 and a secondary separation rear zone 209 by using a partition component 202, so that the primary purified gas reaches the secondary separation front zone 207, and at least part of the partition component 202 is configured to separate liquid impurities from the primary purified gas to form a secondary purified gas, so that the primary purified gas entering the secondary separation front zone 207 must pass through the partition component 202 to reach the secondary separation rear zone 209, and the secondary purified gas entering the secondary separation rear zone 209 can directly or indirectly enter the third container 304 and be discharged from the separation tank through the exhaust port 301.

[0168] Since the axial projection of the partition component 202 along the second container 2010 covers the cross-section of the second container 2010, the structural coordination between the two does not allow the primary purified gas to bypass the partition component 202 and reach the secondary separation rear area, that is, the primary purified gas must flow through the partition component 202, and at least a portion of the partition component 202 separates liquid impurities from the primary purified gas to form secondary purified gas.

[0169] In some embodiments, the partition assembly 202 includes a first liquid impurity separator 2051, a first separator 2061 and a second separator 2062; Figure 5 As shown, the first liquid impurity separator 2051 is disposed on any central axis surface of the second container 2010, such as Figure 7 As shown, and connected to the walls on opposite sides of the central axis; the top of the first liquid impurity separator 2051 is provided with a first partition 2061, as shown Figure 6 As shown, part of the edge of the first partition 2061 is connected to the top, and the other part of the edge is connected to the wall of the second container 2010; the bottom end of the first liquid impurity separator 2051 is provided with a second partition 2062, and part of the edge of the second partition 2062 is connected to the bottom end, and the other part of the edge is connected to the wall of the second container 2010. Figure 7As shown, the first partition 2061 and the second partition 2062 can both be semicircular plates, and the sum of the cross-sectional area of ​​the first liquid impurity separator 2051, the area of ​​the first partition 2061, and the area of ​​the second partition 2062 covers the cross-sectional area of ​​the second container 2010. The shapes of the first partition 2061, the second partition 2062, and the third partition 2063 described below are all selected according to the specific shape of the second container 2010. The first partition 2061 and the second partition 2062 are respectively located on both sides of the first liquid impurity separator 2051. In some embodiments, the first partition 2061 and the second partition 2062 are parallel, and one end of the first liquid guide tube 2031 is connected to the second partition 2062. The liquid impurities separated by the first liquid impurity separator 2051 enter the first liquid guide tube 2031 through the surface of the second partition 2062.

[0170] In the above scheme, the first liquid impurity separator 2051, the first partition plate 2061 and the second partition plate 2062 constitute a partition assembly arranged on the flow path of the primary purified gas. The primary purified gas reaches the secondary separation front area 207, and then passes through the first liquid impurity separator 2051 to reach the secondary separation rear area 209.

[0171] Specifically, the partition assembly 202 is formed by connecting the first partition 2061, the first liquid impurity separator 2051, and the second partition 2062, which can be understood as a Z-shape. The projection of the partition assembly 202 along the axial direction of the second container 2010 covers the cross-section of the second container 2010, ensuring that the primary purified gas entering the secondary separation front area 207 must pass through the partition assembly 202 to reach the secondary separation rear area 209, that is, after the liquid impurities are separated by the liquid material separator 205, it enters the secondary separation rear area 209, and the separated liquid impurity flow flows through the surface of the partition 206 and flows into the first liquid guiding pipe 2031.

[0172] Furthermore, the first liquid impurity separator 2051 is disposed on any central axis surface of the second container 2010 and connected to the walls on opposite sides of the central axis surface, which can maximize the radial size of the liquid impurity separator 205 to improve the degree of separation of liquid impurities.

[0173] In other embodiments, the partition assembly 202 further includes a second liquid impurity separator 2052, a second liquid guide tube 2032, and a third partition 2063; the second liquid impurity separator 2052 and the first liquid impurity separator 2051 are arranged in a longitudinal order and coplanarly, and more specifically, the second liquid impurity separator 2052 is arranged on any central axis surface of the second container 2010, and is connected to the walls on opposite sides of the central axis surface. The top of the second liquid impurity separator 2052 is provided with a third partition 2063, and part of the edge of the third partition 2063 is connected to the top, and the other part of the edge is connected to the wall of the second container 2010. One end of the second liquid guide tube 2032 is connected to the first partition 2061, and the other end is directly or indirectly connected to the drain port 201. The liquid impurities separated by the second liquid impurity separator 2052 enter the second liquid guide tube 2032 through the surface of the first partition 2061.

[0174] The second liquid impurity separator 2052 and the first liquid impurity separator 2051 are arranged in a longitudinal order and on the same plane, and a detour area 208 is formed between the third partition plate 2063, the second liquid impurity separator 2052, the first liquid impurity separator 2051 and the second partition plate 2062. The once purified gas reaches the secondary separation front area 207, passes through the first liquid impurity separator 2051, and is separated as liquid substances by the first liquid impurity separator 2051, then enters the detour area 208, changes its angle and direction, and is separated as liquid substances again by the second liquid impurity separator 2052, and finally reaches the secondary separation rear area 209, and enters the third container through the purification element 303 arranged on the upper side.

[0175] In this way, the angle direction and flow path of the gas can be changed, so that the gas flows in an S-shaped path, increasing the resistance of the gas and further improving the degree of separation of liquid substances.

[0176] Among them, the above-mentioned first liquid impurity separator 2051 and the second liquid impurity separator 2052 include but are not limited to plate bag demisters, adsorption materials, etc., which can allow gas to pass through and retain liquid therein, and the liquid gathers downward by gravity and reaches the drain port 201.

[0177] In some embodiments, the second purification component 200 also includes a liquid collecting plate 204, which is arranged below the partition component 202, and an air guide pipe 106 is inserted into the liquid collecting plate 204, and the air guide pipe 106 connects the first container 101 and the second container 2010; the other port of the first liquid guide pipe 2031 and the second liquid guide pipe 2032 faces the liquid collecting plate 204, which is used to transport liquid impurities to the liquid collecting plate 204, and the height of the discharge port 201 is higher than the height of the liquid collecting plate 204.

[0178] The liquid impurities in the first liquid guiding pipe 2031 and the second liquid guiding pipe 2032 are collected on the liquid collecting plate 204 by gravity, and the drain port 201 is in a closed state under normal conditions. When the liquid level on the liquid collecting plate 204 reaches a set position, the liquid impurities are discharged by opening the drain port 201, which does not affect the normal operation of the system under normal conditions and ensures that the liquid impurities can be discharged regularly.

[0179] In some embodiments, the third purification component 300 includes a mounting plate 302 and multiple purification elements 303; the mounting plate 302 is provided with multiple mounting holes, the multiple purification elements 303 are respectively arranged in the multiple mounting holes, and the multiple purification elements 303 are arranged in the third container 304; the surface of the purification element 303 is provided with adsorption material, and the purification element 303 is provided with a gas channel, which is connected to the third container 304.

[0180] The purification element 303 may be a columnar structure with a single layer or multiple layers of adsorbent material attached to its surface, which allows gas to pass through and aggregates or intercepts solid and liquid impurities. For example, the adsorbent material may be a porous material or a plurality of layers of non-woven fabrics.

[0181] In some embodiments, the energy storage and release system includes a plurality of gas phase pipe sections for gas phase carbon dioxide to flow through. The first container 101, the second container 2010 and the third container 304 are connected as one body, and the purification device 1000 is arranged on any gas phase pipe section. Alternatively, the first container 101, the second container 2010 and the third container 304 are separately arranged, and the three are arranged in sequence along the flow path of the gas phase carbon dioxide and are located on any gas phase pipe section; or, the first container 101, the second container 2010 and the third container 304 are separately arranged, and the three are arranged in sequence along the flow path of the gas phase carbon dioxide and are respectively located on different gas phase pipe sections.

[0182] Reference Figure 6 As shown, in some embodiments, the energy storage and release system includes a working and depressurizing component 4000 and a boosting component 5000, wherein the working and depressurizing component 4000 is connected between the second phase change converter and the boosting component 5000, and the boosting component 5000 is connected between the working and depressurizing component 4000 and the first phase change converter 2001; the working and depressurizing component 4000 is used to utilize gaseous carbon dioxide to do work and release its pressure into low-pressure gaseous carbon dioxide, and the boosting component 5000 is used to obtain high-pressure gaseous carbon dioxide after at least compression processing of the low-pressure gaseous carbon dioxide; wherein, at least one of the working and depressurizing component 4000 and the boosting component 5000 includes a purification device 1000.

[0183] In some embodiments, the working pressure reduction component 4000 includes a second heat exchanger 4001, a heat storage container 4002, a turbine 4003 and a gas storage reservoir 4004; the boost component 5000 includes a compressor 5001 and a first heat exchanger 5002; the second phase change conversion element, the second heat exchanger 4001, the turbine 4003, the gas storage reservoir 4004, the compressor 5001, the first heat exchanger 5002, the first phase change conversion element 2001, and the liquid storage element 2002 are connected in sequence, and the heat storage container 4002 is connected between the first heat exchanger 5002 and the second heat exchanger 4001; the purification device 1000 is arranged on the gas phase pipe section between the first heat exchanger 5002 and the first phase change conversion element 2001, or on the gas phase pipe section between the second phase change conversion element and the second heat exchanger 4001, or on the gas phase pipe section between the second heat exchanger 4001 and the turbine 4003.

[0184] In some embodiments, the purification device 1000 is disposed on the gas phase pipe section between the first heat exchange element 5002 and the first phase change converter 2001, with its air inlet 102 connected to the first heat exchange element 5002 and its air outlet 301 connected to the liquefier.

[0185] In the energy storage step of the system, the low-pressure carbon dioxide gas in the gas storage reservoir 4004 is compressed into high-pressure carbon dioxide gas by the compressor 5001, and the high-pressure carbon dioxide gas is cooled by the first heat exchanger 5002 under the condition of constant pressure, and the cooled high-pressure carbon dioxide gas enters the above-mentioned purification device 1000. In some embodiments, the temperature T of the high-pressure carbon dioxide gas entering the purification device 1000 is controlled to be less than 80°C, and the resistance is reduced to less than 30KPa, so as to form temperature and pressure protection for the hardware facilities of the purification device 1000. The solid impurities separated from the purification device 1000 are regularly discharged from the solid discharge port 103, and the separated liquid impurities are regularly discharged from the middle of the purification device 1000 according to the limit value set for the liquid level height. The purified high-pressure carbon dioxide gas enters the first phase change conversion element 2001 for phase change condensation and liquefaction, and the liquefied liquid carbon dioxide enters the liquid storage element 2002 for storage, that is, the energy storage operation process of the gas-liquid two-phase carbon dioxide energy storage system is completed.

[0186] In the energy release step of the system, the liquid carbon dioxide stored in the liquid storage element 2002 is pumped to the second phase change conversion element, and the vaporized liquid carbon dioxide is phase-changed into carbon dioxide gas. The carbon dioxide gas is then heated by the second heat exchange element 4001, and after being heated to the rated temperature of the system, it enters the turbine 4003 to expand and perform work. The turbine drives the generator to generate electricity, and the low-temperature and low-pressure carbon dioxide gas after the turbine expands and performs work is returned to the gas storage reservoir 4004 for low-pressure storage, thus completing the energy release process. At this point, the complete cycle of gas-liquid two-phase carbon dioxide energy storage and release with the purification device 1000 is completed, and the purification device 1000 ensures that the impurity content in the circulating working fluid of the carbon dioxide energy storage system is safe and controllable.

[0187] The carbon dioxide gas purified by the purification device 1000 reaches the designed rated purification target value, realizes the quality target of the circulating working fluid of the process system, and eliminates the potential risks that impurities may bring to the safe and stable operation of the gas-liquid two-phase carbon dioxide energy storage device.

[0188] The beneficial effects of the carbon dioxide phase change energy storage and release method provided in the embodiment of the present application compared with the prior art are consistent with the beneficial effects of the carbon dioxide phase change energy storage and release system provided in the present application compared with the prior art, and will not be repeated here.

[0189] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A carbon dioxide phase change energy storage and release system, characterized in that: The energy storage and release system includes a condensation component and a vaporization component, and a purification device; the condensation component includes a first phase change conversion component and a liquid storage component connected to each other, the first phase change conversion component is used to convert high-pressure gas phase carbon dioxide into liquid phase carbon dioxide, and the liquid storage component is used to store the liquid phase carbon dioxide; the vaporization component includes a second phase change conversion component, and the second phase change conversion component is used to convert the liquid phase carbon dioxide into gas phase carbon dioxide; the purification device is connected between the first phase change conversion component and the second phase change conversion component, and is used to perform a gas phase carbon dioxide purification process to remove impurities in the gas phase carbon dioxide; The purification device comprises a first container and a first purification component arranged in the first container; an air inlet and a solid discharge port are arranged on the wall of the first container, the air inlet is used to introduce the gas phase carbon dioxide, the solid discharge port is used to discharge solid impurities, and the first purification component is used to separate the solid impurities from the gas phase carbon dioxide to form a primary purified gas; The purification device comprises a second container directly or indirectly connected to the first container, and a second purification component arranged in the second container; a liquid discharge port is arranged on the wall of the second container, the liquid discharge port is used to discharge liquid impurities, and the second purification component is used to separate the liquid impurities from the primary purified gas to form a secondary purified gas; The second purification component includes a partition component and a first liquid guiding pipe member; the partition component divides the second container into a secondary separation front area and a secondary separation rear area, the projection of the partition component along the axial direction of the second container covers the cross section of the second container, at least part of the partition component is configured to separate liquid impurities from the primary purified gas to form the secondary purified gas, one port of the first liquid guiding pipe member is connected to the partition component, and the other port is directly or indirectly connected to the liquid discharge port; The partition assembly includes a first liquid impurity separator, a first partition and a second partition; the first liquid impurity separator is arranged on any central axis surface of the second container and is connected to the walls on opposite sides of the central axis surface; the first partition is arranged at the top of the first liquid impurity separator, part of the edge of the first partition is connected to the top, and the other part of the edge is connected to the wall of the second container; the second partition is arranged at the bottom of the first liquid impurity separator, part of the edge of the second partition is connected to the bottom, and the other part of the edge is connected to the wall of the second container; the first partition and the second partition are respectively located on both sides of the first liquid impurity separator, a port of the first liquid guiding pipe is connected to the second partition, and the liquid impurities separated by the first liquid impurity separator enter the first liquid guiding pipe through the surface of the second partition.

2. The carbon dioxide phase change energy storage and release system according to claim 1, characterized in that: The purification device includes a third container directly or indirectly connected to the second container, and a third purification component disposed in the third container; An exhaust port is provided on the wall of the third container, and the exhaust port is connected to the first phase change conversion element. The third purification component is used to purify the secondary purification gas, and the exhaust port is used to discharge the gas passing through the first purification component, the second purification component and the third purification component.

3. The carbon dioxide phase change energy storage and release system according to claim 1 or 2, characterized in that: The first purification component includes a centrifugal force providing member; The air inlet and the solid discharge port are arranged in order from top to bottom, and the centrifugal force providing member is arranged between the air inlet and the solid discharge port; the centrifugal force providing member is coaxial with the first container and is configured to be able to rotate relative to the first container to provide centrifugal force, so that at least part of the solid impurities in the gas phase carbon dioxide are separated by the centrifugal force and discharged from the solid discharge port by gravity.

4. The carbon dioxide phase change energy storage and release system according to claim 3, characterized in that: The first purification component further comprises a solid impurity filter and an air guide pipe, wherein the air guide pipe is coaxially arranged at the center of the centrifugal force providing member; One port of the air guide pipe is arranged on the outside of the first container, the other port of the air guide pipe is arranged between the centrifugal force providing component and the solid discharge port, the solid impurity filter is arranged on the other port, and the solid impurity filter is used to filter part of the solid impurities in the gas phase carbon dioxide.

5. The carbon dioxide phase change energy storage and release system according to claim 1, characterized in that: The partition assembly also includes a second liquid impurity separator and a second liquid guide pipe, and a third partition plate; The second liquid impurity separator and the first liquid impurity separator are arranged in sequence in the longitudinal direction and in the same plane, the third partition is provided at the top of the second liquid impurity separator, a part of the edge of the third partition is connected to the top, and another part of the edge is connected to the wall of the second container; One end of the second liquid-conducting tube is connected to the first partition plate, and the other end of the second liquid-conducting tube is directly or indirectly connected to the liquid discharge port.

6. The carbon dioxide phase change energy storage and release system according to claim 5, characterized in that: The second purification component further includes a liquid collecting plate, which is arranged below the partition component, and an air guide pipe is plugged into the liquid collecting plate, and the air guide pipe connects the first container and the second container; The other ends of the first liquid guiding pipe member and the second liquid guiding pipe member face the liquid collecting plate, and are used to transport the liquid impurities to the liquid collecting plate. The height of the liquid discharge port is higher than the height of the liquid collecting plate.

7. The carbon dioxide phase change energy storage and release system according to claim 2, characterized in that: The third purification assembly includes a mounting plate and a plurality of purification elements; The mounting plate is provided with a plurality of mounting holes, the plurality of purification elements are respectively arranged in the plurality of mounting holes, and the plurality of purification elements are arranged in the third container; the surface of the purification element is provided with adsorption material, the purification element is provided with a gas channel, and the gas channel is connected to the third container.

8. The carbon dioxide phase change energy storage and release system according to claim 2, characterized in that: The energy storage and release system comprises a plurality of gas phase pipe sections for flowing the gas phase carbon dioxide; The first container, the second container and the third container are integrally connected, and the purification device is arranged on any of the gas phase pipe sections; Or, the first container, the second container and the third container are separately arranged, and the three are arranged in sequence along the flow path of the gas-phase carbon dioxide and are located on any of the gas-phase pipe sections; Alternatively, the first container, the second container and the third container are separately arranged, and the three are arranged in sequence along the flow path of the gas-phase carbon dioxide and are respectively located on different gas-phase pipe sections.

9. The carbon dioxide phase change energy storage and release system according to any one of claims 1-2 and 4-7, characterized in that: The energy storage and release system comprises a work-doing pressure-reducing component and a pressure-boosting component, wherein the work-doing pressure-reducing component is connected between the second phase-change converter and the pressure-boosting component, and the pressure-boosting component is connected between the work-doing pressure-reducing component and the first phase-change converter; the work-doing pressure-reducing component is used to utilize the gas phase carbon dioxide to do work and release its pressure into low-pressure gas phase carbon dioxide, and the pressure-boosting component is used to obtain high-pressure gas phase carbon dioxide after at least compression treatment of the low-pressure gas phase carbon dioxide; Wherein, at least one of the work-doing pressure-reducing component and the pressure-increasing component comprises the purification device.

10. The carbon dioxide phase change energy storage and release system according to claim 9, characterized in that: The working pressure reduction component includes a second heat exchanger, a heat storage container, a turbine and a gas storage reservoir; the pressure boosting component includes a compressor and a first heat exchanger; The second phase-change conversion element, the second heat exchange element, the turbine, the gas storage, the compressor, the first heat exchange element, the first phase-change conversion element, and the liquid storage element are connected in sequence, and the heat storage container is connected between the first heat exchange element and the second heat exchange element; The purification device is arranged on the gas phase pipe section between the first heat exchange element and the first phase change conversion element, or on the gas phase pipe section between the second phase change conversion element and the second heat exchange element, or on the gas phase pipe section between the second heat exchange element and the turbine.

11. A carbon dioxide phase change energy storage and release method for a carbon dioxide phase change energy storage and release system as claimed in any one of claims 1 to 10, characterized in that: The energy storage and release method includes a condensation stage and a vaporization stage, and a gas phase carbon dioxide purification process; wherein, in the condensation stage, the high pressure gas phase carbon dioxide is converted into liquid phase carbon dioxide via a first phase change conversion element; in the vaporization stage, the liquid phase carbon dioxide is converted into gas phase carbon dioxide via a second phase change conversion element; after the vaporization stage and before the condensation stage, the gas phase carbon dioxide purification process is used to remove impurities in the gas phase carbon dioxide; The impurities include at least solid impurities and liquid impurities; the gas phase carbon dioxide purification process includes at least a solid purification process and a liquid purification process; The energy storage and release method comprises: Firstly, the solid purification process is performed using the first purification component to remove the solid impurities; The second purification component is then used to perform the liquid purification process to remove the liquid impurities.

12. The carbon dioxide phase change energy storage and release method according to claim 11, characterized in that: The solid purification process is first performed using the first purification component to remove the solid impurities, including: Firstly, the first purification component is used to provide centrifugal force and the solid impurities are separated from the gas phase carbon dioxide by using the centrifugal force; The solid impurities are then discharged from the first purification component along the direction of the self-gravity by utilizing the self-gravity of the solid impurities.

13. The carbon dioxide phase change energy storage and release method according to claim 11, characterized in that: The reusing of the second purification component to perform the liquid purification process to remove the liquid impurities includes: First, the liquid impurities are separated from the gaseous carbon dioxide by utilizing the material properties of the second purification component; The liquid impurities are then gathered along the direction of the self-gravity by utilizing their own gravity and then discharged from the second purification component.

14. The carbon dioxide phase change energy storage and release method according to any one of claims 11 to 13, characterized in that: The liquid impurities include at least one of water and oil; The solid impurities include at least one of metal rust powder, abrasion powder, environmental dust, inorganic powder, and droplet metal powder.

15. The carbon dioxide phase change energy storage and release method according to any one of claims 11 to 13, characterized in that: The energy storage and release method comprises a pressure-increasing stage and a condensing stage arranged in sequence; In the pressurization stage, the low-pressure gaseous carbon dioxide is at least compressed to obtain high-pressure gaseous carbon dioxide, and the high-pressure gaseous carbon dioxide enters the condensation stage after the gaseous carbon dioxide purification process.

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