Array type heat exchanger structure of compressed air energy storage system

Abstract

The utility model relates to the technical field of heat exchangers, in particular to an array type heat exchanger structure of a compressed air energy storage system, which comprises a plurality of heat exchangers with different grades, the heat exchangers with the different grades are arranged in an ascending order according to the grades and are connected in series, and each heat exchanger comprises at least one heat exchanger unit. The number of heat exchanger units contained in each heat exchanger is in direct proportion to the grade of the heat exchanger, and the scale and the heat exchange area of each heat exchanger are in inverse proportion to the grade of the heat exchanger. Therefore, the problems that a single shell-and-tube heat exchanger is adopted in a traditional compressed air energy storage system, when multiple salt caves and multiple pipelines are used for storing air, unified heat exchange, air storage and air discharging are difficult, and the like are solved.

Description

Technical Field

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

[0002] As an energy storage technology with broad development prospects, compressed air energy storage has the advantages of low construction cost, high energy storage efficiency, large energy storage capacity, etc. Its working principle is similar to that of pumped-storage energy storage. When the electricity consumption of the power system is at a low ebb, electrical energy is consumed to drive an air compressor to store energy in the form of compressed air in a gas storage device; when the electricity load of the power system reaches a peak, the stored compressed air in the gas storage device is released, expands and does work in a turbine expander and drives a generator to generate electricity. According to the above principle, the compressed air energy storage system can complete the conversion of electrical energy - air potential energy - electrical energy.

[0003] To realize the full utilization of compressed heat, a heat exchanger is one of the essential structures. A heat exchanger is a device used to transfer heat, which can transfer heat energy from one object or medium to another object or medium to achieve heat exchange or temperature regulation, and can also be used as a waste heat recovery device. However, most of the heat exchangers used in traditional compressed air energy storage are single-tube heat exchanger units. If a compressed air energy storage system uses multiple salt caverns and multiple pipelines for gas storage, it will be quite difficult to uniformly heat exchange, store gas, and release gas due to the different physical states of each gas storage reservoir. Content of the Utility Model

[0004] The utility model provides an array heat exchanger structure of a compressed air energy storage system to solve the problems that in a traditional compressed air energy storage system using single-tube heat exchanger units, it is difficult to uniformly heat exchange, store gas, and release gas when using multiple salt caverns and multiple pipelines for gas storage.

[0005] The first aspect of the utility model provides an array heat exchanger structure of a compressed air energy storage system, including:

[0006] Multiple heat exchangers of different grades, which are connected in series in ascending order of grades. Among them, each heat exchanger includes at least one heat exchanger unit.

[0007] Optionally, the number of heat exchanger units included in each heat exchanger is proportional to its own grade.

[0008] Optionally, the scale size and heat exchange area of each heat exchanger are inversely proportional to its own grade.

[0009] The second aspect of the utility model provides a compressed air energy storage system, adopting the array heat exchanger structure as described above, including:

[0010] A compressor, one end of which communicates with ambient air to compress the ambient air and generate compressed ambient air;

[0011] A first array heat exchanger, one end of which is connected to the other end of the compressor to exchange heat with the compressed ambient air to form an air flow;

[0012] A plurality of gas storage reservoirs, one end of which is connected to the other end of the first array heat exchanger to store and release the air flow;

[0013] A second array heat exchanger, one end of which is connected to the other end of the plurality of gas storage reservoirs to aggregate the air flows released by the plurality of gas storage reservoirs to obtain an aggregated air flow;

[0014] A turbine, one end of which is connected to the second array heat exchanger and the other end of which communicates with the ambient air to perform work using the aggregated air flow and release the air flow after work.

[0015] Optionally, the lowest-grade heat exchanger of the first array heat exchanger is connected to the compressor, and the highest-grade heat exchanger of the first array heat exchanger is connected to the plurality of gas storage reservoirs.

[0016] Optionally, the lowest-grade heat exchanger of the second array heat exchanger is connected to the turbine, and the highest-grade heat exchanger of the second array heat exchanger is connected to the plurality of gas storage reservoirs.

[0017] Optionally, the number of heat exchangers in the first array heat exchanger and the second array heat exchanger is the same as the number of the plurality of gas storage reservoirs.

[0018] In the array heat exchanger structure of a compressed air energy storage system proposed by the present utility model, the structural characteristics of the shell-and-tube heat exchanger are fully utilized, several heat exchangers with different specifications are arranged in a hierarchical manner, and the air circulation between each gas storage reservoir and the compressor and the turbine is ensured in a total-sub form, thereby improving the heat exchange energy efficiency and the heat exchange amount.

[0019] 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. Description of the Drawings

[0020] The above 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:

[0021] Figure 1 It is a schematic structural diagram of an array heat exchanger structure of a compressed air energy storage system provided according to the present utility model;

[0022] Figure 2 FIG. is a schematic structural diagram of a compressed air energy storage system provided according to the present utility model;

[0023] Figure 3 FIG. is a schematic structural diagram of the compression side of a compressed air energy storage system provided according to the present utility model;

[0024] Figure 4 FIG. is a schematic structural diagram of the turbine side of a compressed air energy storage system provided according to the present utility model.

[0025] Description of the reference numerals:

[0026] 100 - Array heat exchanger structure of the compressed air energy storage system, 101 - Multiple heat exchangers of different grades, 200 - Compressed air energy storage system, 201 - Compressor, 202 - First array heat exchanger, 203 - Multiple gas storage reservoirs, 204 - Second array heat exchanger, and 205 - Turbine. Detailed implementation manners

[0027] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0028] The array heat exchanger structure of the compressed air energy storage system according to the embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0029] Figure 1 FIG. is a schematic structural diagram of an array heat exchanger structure of a compressed air energy storage system provided by an embodiment of the present utility model.

[0030] As Figure 1 shown, the array heat exchanger structure 100 of the compressed air energy storage system includes: multiple heat exchangers 101 of different grades, which are connected in series in ascending order of grade. Among them, each heat exchanger includes at least one heat exchanger unit.

[0031] In some embodiments, the scale and heat transfer area of each stage of heat exchanger unit are inversely proportional to its grade, and the number of heat exchanger units in each stage of heat exchanger unit is directly proportional to its own grade.

[0032] That is to say, the larger the scale of the current heat exchanger unit and the larger the heat exchange area, the lower the grade of the heat exchanger unit. On the contrary, the smaller the scale of the current heat exchanger unit and the smaller the heat exchange area, the higher the grade of the heat exchanger unit. The more heat exchanger units included in the heat exchanger unit, the higher the grade of the heat exchanger. For example, after compressing the ambient air, the first-stage heat exchanger with only one heat exchanger unit exchanges heat for all the compressed ambient air. The N-stage heat exchanger with N heat exchanger units distributes and exchanges heat for all the compressed ambient air, where N is a positive integer.

[0033] In some embodiments, multiple heat exchangers of different grades are arranged in ascending order of grade, and the heat exchanger units between adjacent grades are connected in series through air connection pipes. For example, the first-stage heat exchanger is connected to the second-stage heat exchanger through an air connection pipe, the second-stage heat exchanger is connected to the third-stage heat exchanger through an air connection pipe, and so on. The (N - 1)-stage heat exchanger is connected to the N-stage heat exchanger through an air connection pipe. It should be noted that the multiple heat exchanger units in each stage of the heat exchanger are not connected to each other. In addition, a device such as a three-way valve can be selected to connect the outlet of the heat exchanger unit in the first-stage heat exchanger to the inlet of the heat exchanger unit in the second-stage heat exchanger, so that the air in the first-stage heat exchanger is distributed to the second-stage heat exchanger, and so on for the heat exchangers between other adjacent grades.

[0034] In some embodiments, as Figure 2 shown, the compressed air energy storage system 200 constructed by using an array-type heat exchanger structure includes: a compressor 201, a first array-type heat exchanger 202, multiple gas storage tanks 203, a second array-type heat exchanger 204, and a turbine 205.

[0035] Among them, one end of the compressor 201 communicates with the ambient air to compress the ambient air and generate compressed ambient air. One end of the first array-type heat exchanger 202 is connected to the other end of the compressor 201 to exchange heat for the compressed ambient air to form an air flow. One end of the multiple gas storage tanks 203 is connected to the other end of the first array-type heat exchanger 202 to store and release the air flow. One end of the second array-type heat exchanger 204 is connected to the other end of the multiple gas storage tanks 203 to aggregate the air flows released by the multiple gas storage tanks to obtain an aggregated air flow. One end of the turbine 205 is connected to the second array-type heat exchanger 204, and the other end of the turbine 205 communicates with the ambient air to utilize the aggregated air flow to do work and release the air flow after work.

[0036] As Figure 3As shown in the figure, the compression side of the compressed air energy storage system 200 shows a hierarchical layout from the compressor 201 to the gas storage 203. The lowest-level heat exchanger of the first array heat exchanger 202 is connected to the compressor 201, and the highest-level heat exchanger of the first array heat exchanger 202 is connected to multiple gas storages 203. The ambient air is compressed by the work of the compressor 201 and then exchanges heat in the first-level heat exchanger (i.e., the lowest-level heat exchanger). Devices such as three-way valves can be used to connect the outlet of the first-level heat exchanger to the inlet of the second-level heat exchanger, so that the air in the first-level heat exchanger is distributed to the second-level heat exchanger. And so on. The air flowing in a single heat exchanger unit in each level of heat exchanger unit decreases with the increase in the number of levels, but the total amount of air flowing through each level of heat exchanger unit is the same. After the air flows through the N-level heat exchanger unit (i.e., the highest-level heat exchanger), it enters each gas storage. The number of heat exchanger units connected to the inlet of the gas storage can be dynamically adjusted according to the upper limit of the gas storage capacity of the gas storage, that is, the number of heat exchangers of the first array heat exchanger 202 is the same as the number of multiple gas storages 203, so as to realize the reasonable distribution of the air in each gas storage.

[0037] As Figure 4 shown in the figure, the turbine side of the compressed air energy storage system 200 also shows a hierarchical layout from the gas storage 203 to the turbine 205. The highest-level heat exchanger of the second array heat exchanger 204 is connected to multiple gas storages 203, and the lowest-level heat exchanger of the second array heat exchanger 204 is connected to the turbine 205. Since the compression side and the turbine side are symmetrical, it is stipulated that the direction from the gas storage 203 to the turbine 205 is the direction in which the number of heat exchanger levels decreases. The size and heat transfer area of each level of heat exchanger decrease with the decrease in the level, and the number of heat exchanger units included in each level of heat exchanger increases with the decrease in the number of levels. The number of heat exchangers of the second array heat exchanger 204 is the same as the number of multiple gas storages 203. During operation, the air in each gas storage first enters the N-level heat exchanger (i.e., the highest-level heat exchanger) for heat exchange, and then several heat exchangers can be connected to the heat exchanger units in the next-level heat exchanger through a connecting valve, and so on, until all the air is concentrated in the first-level heat exchanger (i.e., the lowest-level heat exchanger), and finally uniformly flows into the turbine 205 to do work. The process of air aggregation makes the air in each gas storage be fully utilized.

[0038] In summary, according to the array heat exchanger structure of the compressed air energy storage system proposed in the embodiment of the present invention, the structural characteristics of the shell-and-tube heat exchanger are fully utilized, several heat exchangers with different specifications are used, the heat exchangers are reasonably arranged according to a certain rule, and the air flow between each gas storage and the compressor and the turbine is ensured in a total-sub form, so as to improve the heat transfer efficiency and the amount of heat transfer.

[0039] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean 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 N 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.

[0040] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed 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 at least one of such features. In the description of the present utility model, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] Any process or method description shown in a flowchart or described in other ways herein may be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logical function or process, and the scope of the preferred embodiments of the present utility model includes additional implementations, where the functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present utility model pertain.

Claims

1. An array heat exchanger structure of a compressed air energy storage system, characterized in that, Comprising: Multiple heat exchangers of different grades, which are connected in series in ascending order of grades. Among them, each heat exchanger includes at least one heat exchanger unit.

2. The array heat exchanger structure of the compressed air energy storage system according to claim 1, characterized in that The number of heat exchanger units included in each heat exchanger is proportional to its own grade.

3. The array heat exchanger structure of the compressed air energy storage system according to claim 1, characterized in that The scale and heat transfer area of each heat exchanger are inversely proportional to its own grade.

4. A compressed air energy storage system, characterized in that, Adopting the array heat exchanger structure described in any one of claims 1-3, including: A compressor, one end of which communicates with ambient air to compress the ambient air to generate compressed ambient air; A first array heat exchanger, one end of which is connected to the other end of the compressor to exchange heat with the compressed ambient air to form an air flow; Multiple gas storage tanks, one end of which is connected to the other end of the first array heat exchanger to store and release the air flow; A second array heat exchanger, one end of which is connected to the other end of the multiple gas storage tanks to aggregate the air flows released by the multiple gas storage tanks to obtain an aggregated air flow; A turbine, one end of which is connected to the second array heat exchanger, and the other end of which communicates with the ambient air to utilize the aggregated air flow to do work and release the air flow after work.

5. The compressed air energy storage system according to claim 4, wherein The lowest-grade heat exchanger of the first array heat exchanger is connected to the compressor, and the highest-grade heat exchanger of the first array heat exchanger is connected to the multiple gas storage tanks.

6. The compressed air energy storage system according to claim 4, wherein, The lowest-grade heat exchanger of the second array heat exchanger is connected to the turbine, and the highest-grade heat exchanger of the second array heat exchanger is connected to the multiple gas storage tanks.

7. The compressed air energy storage system according to claim 4, wherein, The number of heat exchangers in the first array heat exchanger and the second array heat exchanger is the same as the number of the multiple gas storage tanks.

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