Array type heat exchanger structure and compressed air energy storage system

Abstract

The utility model relates to the technical field of compressed air energy storage, in particular to an array type heat exchanger structure and a compressed air energy storage system.The array type heat exchanger structure comprises multiple stages of heat exchangers, and each stage of heat exchanger comprises a plurality of heat exchangers; the connecting pipeline is connected with all the heat exchangers between adjacent stages; the air mass flow rate in each heat exchanger is adjusted by the valve; air at an inlet of the first-stage heat exchanger is collected in the first target pipeline, air at an outlet of the last-stage heat exchanger is collected in the second target pipeline, and the first target pipeline and the second target pipeline are connected with the gas storage, the compressor and the turbine to achieve unification of air mass flow rates. Therefore, the problems that in the prior art, a large single heat exchanger is usually used for achieving heat exchange of a compressed air energy storage system, the heat exchange energy efficiency cannot be improved while the air exchange amount cannot be guaranteed, the operation efficiency of the heat exchanger is reduced, the energy storage efficiency of the system is reduced, and the use experience of a user is affected are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage, and particularly relates to an array heat exchanger structure and a compressed air energy storage system. Background Art

[0002] As one of the only two long-term energy storage systems, the compressed air energy storage system has advantages such as convenient site selection and safe operation, and has a very good development prospect. The compressed air energy storage system mainly consists of a compressor, a heat exchanger, a turbine, and a gas storage reservoir. As a key component in the thermal system of the entire series-connected system, the heat exchanger's heat transfer capacity, air volume, and improvement of operating efficiency are the main concerns of those skilled in the art. At present, to meet the requirements of green power generation, adiabatic compressed air energy storage technology is usually used. Adiabatic compressed air energy storage abandons the preheating link on the power generation side, directly heats the air using the compressed heat stored during the compression stage, and uses a turbine for power generation. Therefore, improving the operating efficiency of its heat exchanger is particularly important.

[0003] In related technologies, large single heat exchangers are usually used as the core components of the heat exchange system in compressed air energy storage systems. However, in related technologies, large single heat exchangers usually cannot balance high efficiency and high flow rate well when the fluid mass flow rate is large, resulting in problems such as the inability to ensure the air volume while improving the heat exchange energy efficiency, the decrease in the operating efficiency of the heat exchanger, the decrease in the energy storage efficiency of the system, and the impact on the user experience. Summary of the Utility Model

[0004] The utility model provides an array heat exchanger structure and a compressed air energy storage system to solve the problems in related technologies where large single heat exchangers are usually used to achieve heat exchange in compressed air energy storage systems, which easily leads to the inability to ensure the air volume while improving the heat exchange energy efficiency, resulting in a decrease in the operating efficiency of the heat exchanger, a decrease in the energy storage efficiency of the system, and an impact on the user experience.

[0005] The first aspect of the utility model proposes an array heat exchanger structure, including: a multi-stage heat exchanger, where each stage of the heat exchanger includes a plurality of parallel heat exchangers; connection pipes are arranged between each stage of the heat exchanger, and the connection pipes are connected to all heat exchangers between adjacent stages, and the air mass flow rate in each heat exchanger is adjusted through valves at the connection points; a first target pipe and a second target pipe, where at the inlet of the first stage of the multi-stage heat exchanger, air flowing through each heat exchanger unit is collected by a pipe into the first target pipe, and at the outlet of the last stage of the multi-stage heat exchanger, air flowing through each heat exchanger unit is collected by a pipe into the second target pipe, and the first target pipe and the second target pipe are connected to the gas storage reservoir, the compressor, and the turbine to achieve the unification of the air mass flow rate.

[0006] According to the array heat exchanger structure of the present utility model, by adopting a total - sub - total structure and controlling the valves at the connection points, the unified air mass flow rate is achieved; the independence between each stage of the heat exchanger reduces the complexity of the structure, and the larger diameters of the first target pipeline and the second target pipeline ensure the smoothness of air flow. In addition, by ensuring that the parameters of each heat exchanger are consistent, the stability and controllability of the overall structure are enhanced.

[0007] In addition, the array heat exchanger structure proposed above according to the present utility model may also have the following additional technical features:

[0008] Optionally, the parameters of each heat exchanger in the multi - stage heat exchanger are consistent.

[0009] Optionally, the parameters of each heat exchanger include the heat transfer area.

[0010] Optionally, there is no connection relationship between each heat exchanger in the multi - stage heat exchanger.

[0011] Optionally, the diameters of the first target pipeline and the second target pipeline are larger than the diameter of the connecting pipeline.

[0012] In the second aspect of the present utility model, a compressed air energy storage system is proposed, including: a gas storage reservoir, a compressor, and a turbine; the array heat exchanger structure as in the above - mentioned embodiment, wherein the outlet and the inlet of the array heat exchanger structure are connected to the gas storage reservoir, the compressor, and the turbine.

[0013] According to the compressed air energy storage system of the present utility model, by adopting the above - mentioned array heat exchanger structure, the heat transfer power required for the heat exchanger is generated by obtaining the heat transfer demand of the compressed air energy storage system, and thus the opening and closing of the valves at the connection points of the array heat exchanger structure are controlled according to the heat transfer power, obtaining the adjusted topological structure of the array heat exchanger structure. Based on the adjusted topological structure of the array heat exchanger structure, the heat transfer of the compressed air energy storage system is realized, achieving the improvement of the heat transfer energy efficiency of the compressed air energy storage system while ensuring the air change amount.

[0014] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above - mentioned and / or additional aspects and advantages of the present utility model will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0016] Figure 1 It is a block diagram of an array heat exchanger structure provided according to an embodiment of the present utility model;

[0017] Figure 2It is a block diagram of a compressed air energy storage system provided according to an embodiment of the present invention.

[0018] Explanation of reference numerals: 2 - connection point, 3 - first target pipeline, 4 - second target pipeline, 5 - gas storage, 6 - compressor, 7 - turbine, 10 - array heat exchanger structure, 100 - stage heat exchanger, 101 - heat exchanger; 20 - compressed air energy storage system. Detailed implementation manners

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] The following describes the array - type heat exchanger structure and compressed air energy storage system according to the embodiments of the present utility model with reference to the accompanying drawings. Aiming at the problem in the above - mentioned background technology that using a large single - body heat exchanger to achieve heat exchange in a compressed air energy storage system is likely to result in the inability to ensure the air change rate while improving the heat exchange energy efficiency, leading to a decrease in the operating efficiency of the heat exchanger, a decrease in the system energy storage efficiency, and an impact on the user experience. The present utility model provides an array - type heat exchanger structure, in which: it includes a multi - stage heat exchanger. Each stage of the heat exchanger includes a plurality of parallel - connected heat exchangers; connection pipes are arranged between each stage of the heat exchanger, and the connection pipes are connected to all the heat exchangers between adjacent stages. The air mass flow rate in each heat exchanger is adjusted through the valves at the connection points; a first target pipe and a second target pipe. The air flowing through each heat exchanger unit is collected in the first target pipe at the inlet of the first - stage heat exchanger of the multi - stage heat exchanger through a pipe, and the air flowing through each heat exchanger unit is collected in the second target pipe at the outlet of the last - stage heat exchanger of the multi - stage heat exchanger through a pipe. The first target pipe and the second target pipe are connected to a gas storage tank, a compressor, and a turbine to achieve the unification of the air mass flow rate. Thus, the problems in the related technology that usually use a large single - body heat exchanger to achieve heat exchange in a compressed air energy storage system, which are likely to result in the inability to ensure the air change rate while improving the heat exchange energy efficiency, leading to a decrease in the operating efficiency of the heat exchanger, a decrease in the system energy storage efficiency, and an impact on the user experience, are solved.

[0023] First, the array - type heat exchanger structure proposed according to the embodiments of the present utility model will be described with reference to the accompanying drawings.

[0024] Figure 1 It is a block diagram of an array - type heat exchanger structure provided by an embodiment of the present utility model.

[0025] As Figure 1 shown, the array - type heat exchanger structure 10 according to the embodiment of the present utility model includes: a multi - stage heat exchanger 100. Each stage of the heat exchanger 100 includes a plurality of parallel - connected heat exchangers 101; connection pipes are arranged between each stage of the heat exchanger 100, and the connection pipes are connected to all the heat exchangers between adjacent stages. The air mass flow rate in each heat exchanger is adjusted through the valves at the connection point 2; a first target pipe 3 and a second target pipe 4. The air flowing through each heat exchanger unit is collected in the first target pipe at the inlet of the first - stage heat exchanger 100 of the multi - stage heat exchanger through a pipe, and the air flowing through each heat exchanger unit is collected in the second target pipe 4 at the outlet of the last - stage heat exchanger 100 of the multi - stage heat exchanger through a pipe. The first target pipe 3 and the second target pipe 4 are connected to a gas storage tank 5, a compressor 6, and a turbine 7 to achieve the unification of the air mass flow rate.

[0026] It should be noted that the heat exchanger 101 is a small - type heat exchanger, and the specific type of the heat exchanger is not specifically limited here.

[0027] Among them, the heat exchanger 101 units are arranged regularly, and a total - sub - total structure is adopted to ensure that the first target pipeline 3 and the second target pipeline 4 are connected to the gas storage 5, the compressor 6, and the turbine 7 to achieve the unification of the air mass flow rate.

[0028] Therefore, in the embodiment of the present utility model, the array - type heat exchanger structure includes a multi - stage heat exchanger 100, and each stage is composed of multiple parallel - connected heat exchanger 101 units. The stages are connected by connecting pipelines, and the connecting pipelines are connected to all the heat exchangers between adjacent stages, forming connection points 2, thereby realizing the adjustment of the air mass flow rate. In addition, it also includes a first target pipeline 3 and a second target pipeline 4, which are respectively used to collect the air of the first - stage heat exchanger and the last - stage heat exchanger, and are connected to the gas storage 5, the compressor 6, the turbine 7, etc., to achieve the unification of the air mass flow rate.

[0029] Optionally, in an embodiment of the present utility model, the parameters of each heat exchanger 101 in the multi - stage heat exchanger 100 are the same.

[0030] Therefore, in the embodiment of the present utility model, the parameters of each heat exchanger 101 unit in the multi - stage heat exchanger 100 are the same, thus ensuring that each heat exchanger 101 unit has the same performance under the same conditions, making the overall structure more stable and easier to control.

[0031] Optionally, in an embodiment of the present utility model, the parameters of each heat exchanger 101 include the heat transfer area.

[0032] Therefore, in the embodiment of the present utility model, it is clarified that the parameters of each heat exchanger 101 unit include the heat transfer area, and the heat transfer area is one of the key indicators of the heat exchanger performance, which directly affects the heat transfer efficiency of each stage of the heat exchanger 100.

[0033] Optionally, in an embodiment of the present utility model, there is no connection relationship between each heat exchanger 101 in the multi - stage heat exchanger 100.

[0034] Therefore, in the embodiment of the present utility model, there is no connection relationship between each heat exchanger 101 unit in the multi - stage heat exchanger 100, realizing that each heat exchanger 101 is independent, and they do not directly exchange heat or fluid. Due to the use of small - sized heat exchangers, the heat transfer within each heat exchanger unit can be carried out more fully, and the number of heat exchanger units and stages can be freely added or removed to achieve the improvement of heat transfer efficiency and the desired ventilation volume. This design can simplify the structure, reduce complexity, and facilitate adjustment.

[0035] Optionally, in an embodiment of the present utility model, the diameters of the first target pipeline 3 and the second target pipeline 4 are larger than the diameter of the connecting pipeline.

[0036] Thus, in the embodiment of the present utility model, the diameters of the first target pipe 3 and the second target pipe 4 are larger than the diameter of the connecting pipe, so that the heat exchanger can adapt to a larger air flow rate, ensuring that air can smoothly enter and leave the array type heat exchanger structure 10.

[0037] In summary, for the array type heat exchanger structure proposed according to the embodiment of the present utility model, by adopting a total - sub - total structure, the unified air mass flow rate is achieved by controlling the valves at the connection points; the independence between the heat exchangers at all levels reduces the complexity of the structure, and the larger diameters of the first target pipe and the second target pipe ensure the smoothness of air flow. In addition, by ensuring that the parameters of each heat exchanger are consistent, the stability and controllability of the overall structure are enhanced.

[0038] The present utility model also proposes a compressed air energy storage system including the above - mentioned array type heat exchanger structure.

[0039] As Figure 2 shown, the compressed air energy storage system 20 includes: an air storage tank 5, a compressor 6, and a turbine 7; the array type heat exchanger structure 10 as in the above - mentioned embodiment, wherein the outlet and the inlet of the array type heat exchanger structure 10 are connected to the air storage tank 5, the compressor 6, and the turbine 7.

[0040] It can be understood that the inlet of the array type heat exchanger structure 10 is where the air flowing through each heat exchanger unit is collected by pipes at the inlet of the first - stage heat exchanger 100 and converges in the first target pipe 3; the outlet of the array type heat exchanger structure 10 is where the air flowing through each heat exchanger unit is collected by pipes at the outlet of the last - stage heat exchanger 100 and converges in the second target pipe 4.

[0041] Among them, the heat exchanger units 101 in the array type heat exchanger structure 10 are regularly arranged, and a total - sub - total structure is adopted to ensure the connection between the outlet and the inlet of the array type heat exchanger structure 10 and the air storage tank 5, the compressor 6, and the turbine 7.

[0042] Specifically, as Figure 1 and Figure 2As shown in the figure, the array heat exchanger structure 10 can be divided into N levels from top to bottom. Each level of heat exchanger 100 is composed of a number of heat exchanger 101 units connected in parallel. The heat transfer area and other parameters of each heat exchanger 101 are the same, and there is no connection relationship between the heat exchangers 101. At the inlet of the first-level heat exchanger 100 and the outlet of the last-level heat exchanger 100, the first target pipeline and the second target pipeline collect the air flowing through each heat exchanger 101 unit in the pipeline. The pipeline is connected to the gas storage tank 5, the compressor 6, and the turbine 7 to achieve the unification of the air flow rate. Connecting pipelines are arranged between each level of heat exchanger 100, and the connecting pipelines are connected to all the heat exchangers 101 between adjacent levels. The mass flow rate of the air in each heat exchanger unit can be dynamically adjusted through the valves at the pipeline connection points to achieve the reasonable distribution of the air. Due to the use of small heat exchangers, the heat transfer in each heat exchanger 101 unit can be carried out more fully, and the number of heat exchanger units and levels can be freely added or removed to improve the heat transfer efficiency and the expected ventilation volume, thus forming the heat transfer of the compressed air energy storage system 20.

[0043] In summary, according to the compressed air energy storage system proposed by the embodiment of the present invention, the above-mentioned array heat exchanger structure is adopted. By obtaining the heat transfer requirements of the compressed air energy storage system, the heat transfer power required by the heat exchanger is generated. Then, according to the heat transfer power, the opening and closing of the valves at the connection points of the array heat exchanger structure are controlled to obtain the topological structure of the adjusted array heat exchanger structure. Based on the topological structure of the adjusted array heat exchanger structure, the heat transfer of the compressed air energy storage system is realized, and the heat transfer efficiency of the compressed air energy storage system is improved while ensuring the ventilation volume.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0047] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An array heat exchanger structure, characterized in that, Comprising: A multi-stage heat exchanger, wherein each stage of the heat exchanger includes a plurality of heat exchangers connected in parallel; Connection pipes are arranged between each stage of heat exchangers, and the connection pipes are connected to all heat exchangers between adjacent stages. The air mass flow rate in each heat exchanger is adjusted by valves at the connection points; A first target pipe and a second target pipe, wherein at the inlet of the first stage heat exchanger of the multi-stage heat exchanger, air flowing through each heat exchanger unit is collected by a pipe into the first target pipe, and at the outlet of the last stage heat exchanger of the multi-stage heat exchanger, air flowing through each heat exchanger unit is collected by a pipe into the second target pipe. The first target pipe and the second target pipe are connected to a gas storage reservoir, a compressor, and a turbine to achieve a unified air mass flow rate.

2. The array heat exchanger structure according to claim 1, characterized in that, The parameters of each heat exchanger in the multi-stage heat exchanger are the same.

3. The array heat exchanger structure according to claim 2, wherein, The parameters of each heat exchanger include the heat transfer area.

4. The array heat exchanger structure according to claim 1, wherein, There is no connection relationship between each heat exchanger in the multi-stage heat exchanger.

5. The array heat exchanger structure according to claim 1, wherein The diameters of the first target pipe and the second target pipe are larger than the diameter of the connection pipe.

6. A compressed air energy storage system, characterized in that, Comprising: A gas storage reservoir, a compressor, and a turbine; The array heat exchanger structure according to any one of claims 1-5, wherein the outlet and inlet of the array heat exchanger structure are connected to the gas storage reservoir, the compressor, and the turbine.

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