CN110749223A - Access shared compressed air energy storage and heat storage system - Google Patents

Abstract

The invention provides an access and shared compressed air energy storage heat storage system, the access shared compressed air energy storage heat storage system includes: a heat storage device, the heat storage device includes a plurality of heat accumulators, and the heat accumulator has a A heat storage cavity filled with heat storage medium and a heat exchange cavity isolated from the heat storage cavity, the heat exchange cavity of the plurality of heat accumulators are connected in parallel to the heat exchange flow path of the heat storage device, and at least part of the plurality of heat exchange cavities It can be selectively communicated with the heat exchange flow path; the compressor, the compressor is connected with the heat exchange flow path; the gas storage device, the inlet and the outlet of the gas storage device are respectively connected to both ends of the heat exchange flow path; the expander, the expander Connected to the heat exchange flow path. The access shared compressed air energy storage and heat storage system of the present invention can greatly reduce investment costs, save operating electrical losses and pressure drop losses during air heating and cooling, improve system efficiency, and can be independently incorporated into heat exchange flow paths through design The multiple heat accumulators ensure that the stored thermal energy is high-temperature high-quality thermal energy.

Description

Access shared compressed air energy storage and heat storage system

technical field

The invention relates to the technical field of energy storage, in particular to an access shared compressed air energy storage and heat storage system.

Background technique

At present, my country's clean energy power generation sources are developing rapidly, and new clean and renewable energy represented by hydropower, photovoltaics and wind power has become the primary choice for building clean energy power stations in my country. Due to the complex power supply structure, power grid structure, electricity price structure and historical factors, it has caused prominent contradictions such as distortion of power resource allocation, and limited by the characteristics of conventional power supply and power grid structure, the problem of new energy consumption is prominent. Large-scale power storage technology can effectively solve the instability of renewable energy, adjust the peak and valley of the power grid, and improve the economy and stability of the power system.

Compressed air energy storage has been vigorously promoted because it does not require fuel supplementary combustion and has good environmental friendliness. However, how to improve the system efficiency of advanced adiabatic compressed air energy storage technology and reduce operating costs has also become one of the research hotspots in this technical field. .

SUMMARY OF THE INVENTION

The embodiment of the present invention provides an access and shared compressed air energy storage and heat storage system, which is used to solve the defect of low energy efficiency in the prior art.

An embodiment of the present invention provides an access and shared compressed air energy storage heat storage system, including: a heat storage device, wherein the heat storage device includes a plurality of heat accumulators, and the heat accumulator has a heat storage device for filling a heat storage medium a heat chamber and a heat exchange chamber isolated from the heat storage chamber, the heat exchange chambers of the plurality of heat accumulators are connected in parallel to the heat exchange flow paths of the heat storage device, and the plurality of heat exchange chambers At least part of them can be selectively communicated with the heat exchange flow path; a compressor, the compressor is connected with the heat exchange flow path; an air storage device, the inlet and outlet of the air storage device are respectively connected to the two ends of the heat exchange flow path; an expander, the expander is connected with the heat exchange flow path.

In some embodiments, there are multiple compressors, the multiple compressors are connected in series, and the adjacent compressors along the compressed gas path are distributed on opposite sides of the heat exchange flow path.

In some embodiments, there are multiple expanders, the multiple expanders are connected in series, and the adjacent expanders along the expansion gas path are distributed on opposite sides of the heat exchange flow path.

In some embodiments, the heat accumulator includes a plurality of sub heat accumulators, each of the sub heat accumulators has the heat storage cavity and the heat exchange cavity, and the plurality of heat accumulators of the same heat accumulator Each of the heat exchange chambers is synchronously connected or disconnected from the heat exchange flow path.

In some embodiments, the sub-regenerator includes a first tube and a second tube, the second tube is sleeved outside the first tube, and between the second tube and the first tube The heat storage cavity is defined, and the first tube defines the heat exchange cavity.

In some embodiments, the sub-regenerator includes a first tube, a second tube, and a third tube, and the third tube, the second tube, and the first tube are sleeved sequentially from outside to inside , and the heat storage cavity is defined between the second tube and the first tube, and the heat exchange cavity is respectively defined between the third tube and the second tube and the first tube .

In some embodiments, the heat exchange cavity is linear.

In some embodiments, the heat exchange chambers of a plurality of the sub-regenerators of the same regenerator are connected in parallel.

In some embodiments, a plurality of the sub-regenerators of the same regenerator are arranged side by side.

In some embodiments, a plurality of the heat exchange chambers of the same heat accumulator are connected to the heat exchange flow path through a common control valve.

The access and shared compressed air energy storage heat storage system of the embodiment of the present invention can not only greatly reduce the investment cost, but also save the operation power loss by designing the storage and access shared heat storage device and the self-flowing scheme of the heat exchange medium. As well as the pressure drop loss during air heating and cooling, the system efficiency is improved. By designing multiple heat accumulators that can be incorporated into the heat exchange flow path independently, the stored heat energy is guaranteed to be high-temperature high-quality heat energy.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of an access shared compressed air energy storage heat storage system provided by an embodiment of the present invention;

2 is a schematic cross-sectional view of a sub-regenerator of an access-shared compressed air energy storage heat storage system provided by an embodiment of the present invention;

3 is a schematic longitudinal cross-sectional view of a sub-regenerator of an access and shared compressed air energy storage heat storage system provided by an embodiment of the present invention;

4 is a schematic cross-sectional view of another sub heat accumulator of the access and shared compressed air energy storage heat storage system provided by the embodiment of the present invention.

Reference number:

10 - heat storage device; 11 - heat accumulator; 12 - sub heat accumulator; 13 - first tube; 14 - second tube; 15 - third tube; 16 - heat storage medium; 17 - heat exchange chamber; 18 -Control valve; 19-Heat exchange flow path;

20-gas storage device; 31-first-stage compressor; 32-secondary compressor; 33-third-stage compressor; 41-first-stage expander; 42-second-stage expander; A/B/C-motor; D /E-generator.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The following describes an access and shared compressed air energy storage and heat storage system according to an embodiment of the present invention with reference to FIGS. 1 to 4 .

As shown in FIG. 1 , the access and shared compressed air energy storage and heat storage system according to the embodiment of the present invention includes: a heat storage device 10 , a compressor, a gas storage device 20 and an expander.

The heat storage device 10 includes a plurality of heat accumulators 11. The heat accumulators 11 are used for storing energy and releasing energy when needed. For example, excess electrical energy can be stored in the form of thermal energy, and then the heat energy can be released when needed.

The heat accumulator 11 has a heat storage cavity and a heat exchange cavity 17. The heat storage cavity is used to fill the heat storage medium 16. The heat storage medium 16 includes but is not limited to molten salt. The heat exchange cavity 17 is isolated from the heat storage cavity and can pass through the middle. The isolation layer is thermally conductive, and the isolation layer is made of good thermal conductors, such as copper, stainless steel, aluminum and other metals.

The plurality of heat accumulators 11 are connected in parallel, the heat exchange chambers 17 of the plurality of heat accumulators 11 are connected in parallel to the heat exchange flow path 19 of the heat storage device 10, and at least part of the plurality of heat exchange chambers 17 can be selectively connected to The heat exchange flow path 19 communicates with each other. For example, each heat storage device 10 is connected to the heat exchange flow path 19 through its corresponding control valve 18 .

The compressor is connected to the heat exchange flow path 19 of the heat accumulator 11, and the working medium (which may be air) of the compressor is the heat exchange medium. The compressor can be an air compressor. The compressor is used to compress the air. During the compression process, the air will be supercharged and heated. The compressor can be connected with a motor. For example, the compressor in Figure 1 is driven by the motor A/B/C. It can be driven by renewable electricity such as wind power and photovoltaic power that is not convenient for the Internet.

The expander is connected to the heat exchange flow path 19, and the working medium of the expander is also a heat exchange medium. The expander can output mechanical work when the compressed gas is expanded and depressurized, and the temperature of the gas will decrease. The expander is used to convert the internal energy and pressure potential energy of the compressed air into mechanical energy output. For example, the expander can be connected to a generator D. /E, to drive the generator D/E to generate electricity.

The inlet and outlet of the gas storage device 20 are respectively connected to two ends of the heat exchange flow path 19 , and the gas storage device 20 is used to store high-pressure gas. For example, the gas storage device 20 may include a pipeline steel gas storage device 20 . The gas storage device 20 can maintain the thermal energy of the gas stored in the gas through thermal insulation treatment. The two ends of the heat exchange flow path 19 refer to the two main trunk paths of the heat exchange flow path 19 that are respectively connected to both ends of the heat exchange cavity 17 .

In the energy storage stage, the compressor works, and the heat exchange medium (which can be gas such as air) flows through the heat exchange cavity 17, and transfers heat energy to the heat storage medium 16 in the heat storage cavity, such as molten salt in the heat storage cavity. The heat is heated and melted, so that the energy of the heat exchange medium in the heat exchange cavity 17 can be transferred to the heat storage medium 16 in the heat storage cavity for storage. The heat exchange medium (high pressure gas) after heat exchange can be stored in the gas storage device 20 .

In the energy release stage, the heat exchange medium (high pressure gas) stored in the gas storage device 20 flows through the heat exchange cavity 17, and the heat storage medium 16 in the heat storage cavity transfers heat to the heat exchange medium in the heat exchange cavity 17, so that the exchange After the heat medium is heated up, it flows into the expander to do work to output energy. For example, the molten salt in the heat storage chamber releases heat to cool down and solidify, so that the heat energy stored by the heat storage medium 16 in the heat storage chamber can be released.

In other words, the heat storage device 10 uses the same heat exchange chamber 17 for energy storage and energy release, that is to say, the high temperature heat exchange medium in the energy storage stage and the low temperature heat exchange medium in the energy release stage flow through the same The heat exchange cavity 17 is provided, so that the structure of the whole heat accumulator 11 is simple.

In addition, the medium flowing during energy storage and potential energy is high-pressure heat exchange gas, which is driven by the pressure difference inside the gas when the system is running, and the heat storage medium does not need to flow, so there is no need to install a drive pump. Since the heat storage medium 16 does not need to flow, compared with the solution of driving the heat storage medium 16 to flow in the related art, the operation electric loss and the construction cost of the driving pump can be saved.

It can be understood that, in the energy storage stage, the energy storage of each heat accumulator 11 can be realized one by one by controlling the communication state of each heat accumulator 11 and the heat exchange flow path 19 . For example, in FIG. 1 , each heat accumulator 11 can control the communication state between itself and the heat exchange flow path 19 through the corresponding control valve 18. When all the molten salt in the current heat accumulator 11 reaches the design energy storage temperature , close the branch control valve 18 of the current heat accumulator 11 , open the control valve 18 of the other heat accumulators 11 without heat storage, and so on.

Of course, by controlling the opening and closing states of the control valve 18 , multiple heat accumulators 11 can be stored or released in parallel and synchronously. The heat accumulators 11 are synchronously connected in series to store heat.

Similarly, in the energy release stage, various energy release modes of each heat accumulator 11 can be realized by controlling the communication state of each heat accumulator 11 and the heat exchange flow path 19 .

In this way, an appropriate number of heat accumulators 11 can be selected to work or an appropriate working mode according to the current demand for energy storage or energy release, so as to ensure that the stored thermal energy is high-temperature high-quality thermal energy.

According to the access and shared compressed air energy storage heat storage system according to the embodiment of the present invention, by designing the storage and access shared heat storage device 10 and the self-flow scheme of the heat exchange medium, not only the investment cost can be greatly reduced, but also the operation can be saved. Electric loss and pressure drop loss during air heating and cooling improve system efficiency. By designing multiple heat accumulators 11 that can be incorporated into heat exchange flow paths 19 independently, it is beneficial to capacity expansion and modular operation of the system.

In some embodiments, the access and shared compressed air energy storage and heat storage system of the embodiment of the present invention includes a plurality of compressors, and the plurality of compressors are connected in series, so that a multi-stage compression mode can be formed, so that the gas storage device can be stored The gas pressure of 20 is large enough.

As shown in FIG. 1 , adjacent compressors along the compressed air passage are distributed on opposite sides of the heat exchange passage 19 . In other words, the compressors of two adjacent stages are distributed on both sides of the heat storage device 10 respectively. The compressed gas path refers to the flow path of the compressed gas in the energy storage stage. For example, in FIG. 1 , the first-stage compressor 31 is arranged on the upper side of the heat storage device 10 (the upper part in FIG. 1 ), the second-stage compressor 32 is arranged on the lower side of the heat storage device 10 (the lower part in FIG. 1 ), and the third-stage compressor The compressor 33 is arranged on the upper side (upper in FIG. 1 ) of the thermal storage device 10 . The high-temperature air passing through the outlet of the primary compressor 31 heats the heat storage medium 16 in the heat accumulator 11 , and then flows to the lower side of the heat storage device 10 . The secondary compressor 32 is arranged on the lower side of the heat accumulator 11. At this time, the medium-pressure air passing through the heat exchange outlet is further compressed by the secondary compressor 32, so as to avoid the need to increase the amount of the secondary compressor 32 on the upper side. Problems with air outlet pipes and increased air pressure drop. Similarly, the tertiary compressor 33 is placed on the upper side of the heat accumulator 11 to receive the high-pressure air from the secondary compressor 32 .

It should be noted that, in the related art, the pressure drop of a large-scale compressed air energy storage system is very serious. The inventor has found through a lot of research that the pressure drop comes from the long and curved flow path caused by the inflow of air into the outlet pipe. By distributing the adjacent two-stage compressors on both sides of the heat storage device 10, the construction cost of the air inflow and outlet pipes can be saved, the pressure drop of the entire system can be greatly reduced, and the energy storage efficiency of the system can be enhanced.

In some embodiments, the access and shared compressed air energy storage thermal storage system of the embodiment of the present invention includes a plurality of expanders, and the plurality of expanders are connected in series. In this way, a multi-stage expansion mode can be formed, the pressure of each stage can be fully utilized, and the energy release efficiency is higher.

As shown in FIG. 1 , adjacent expanders along the expansion gas path are distributed on opposite sides of the heat exchange flow path 19 . In other words, the expanders of two adjacent stages are respectively distributed on both sides of the thermal storage device 10 . The expansion gas path refers to the flow path of the gas in the energy release stage. For example, in FIG. 1 , the primary expander 41 is arranged on the upper side (upper in FIG. 1 ) of the thermal storage device 10 , and the secondary expander 42 is arranged on the lower side (lower in FIG. 1 ) of the thermal storage device 10 . In the present application, by distributing the adjacent two-stage expanders on both sides of the heat storage device 10, the construction cost of the air inflow and outlet pipes can be saved, the pressure drop of the entire system can be greatly reduced, and the energy release efficiency of the system can be enhanced.

The heat accumulator 11 includes a plurality of sub heat accumulators 12, as shown in Figs. 2 to 4, each sub heat accumulator 12 has a heat storage cavity and a heat exchange cavity 17, and the heat storage cavity in Fig. 2 to Fig. 4 has been filled There is a heat storage medium 16 , and multiple heat exchange chambers 17 of the same heat accumulator 11 are connected or disconnected synchronously with the heat exchange flow path 19 .

In other words, each regenerator 11 is essentially a sub-regenerator group, so that under the condition of a certain heat storage capacity, each sub-regenerator 12 can be designed to be smaller, correspondingly, each heat storage cavity and each exchange The cross-sectional area of the thermal cavity 17 can be made smaller, which can improve the heat exchange efficiency.

The heat exchange chambers 17 of a plurality of sub-regenerators 12 of the same heat accumulator 11 are connected in parallel, that is, when a certain heat accumulator 11 is working, the plurality of sub-regenerators 12 of the heat accumulator 11 work in parallel and synchronously, so as to improve the performance of each heat accumulator 11. The heat exchange rate of each heat accumulator 11.

A plurality of sub-regenerators 12 of the same regenerator 11 are arranged side by side, so as to facilitate the packaging of the entire regenerator 11 and the parallel connection between the heat exchange chambers 17 .

As shown in FIG. 1 , the plurality of heat exchange chambers 17 of the same heat accumulator 11 are connected to the heat exchange flow path 19 through a common control valve 18 , and the on-off state of the corresponding control valve 18 is controlled, so that each accumulator can be realized. The parallel connection of the plurality of sub-regenerators 12 of the heat exchanger 11 is turned on and off.

As shown in FIGS. 2-4 , the heat exchange cavity 17 is linear. In this way, in the energy storage or energy release stage, compared with the U-shaped loop in the related art, the pressure drop loss can be greatly reduced, thereby enhancing the energy efficiency of the system.

In some embodiments, as shown in FIGS. 2-3 , the sub-regenerator 12 includes a first tube 13 and a second tube 14 , the second tube 14 is sleeved outside the first tube 13 , and the second tube 14 is connected to the first tube 14 . A tube 13 is radially spaced apart such that a heat storage chamber is defined between the second tube 14 and the first tube 13 , and the first tube 13 defines a heat exchange chamber 17 .

In other words, the sub-regenerator 12 is of double-layer casing type, the first tube 13 (inner tube) is used for circulating heat exchange medium (such as compressed air), and the space between the second tube 14 and the first tube 13 is used for storage and storage The heat medium 16, the heat storage cavity between the second pipe 14 and the first pipe 13 are closed. The heat storage cavity and the heat exchange cavity 17 are separated by a first tube 13, which can be made of a good conductor of heat to facilitate heat exchange. The second tube 14 is covered with a thermal insulation layer. In this way, by designing the heat storage cavity of the outer ring, the filling thickness of the heat storage cavity (the heat storage medium 16 ) is relatively thin, which facilitates uniform heat storage or heat release in each area of the heat storage medium 16 .

The second tube 14 and the first tube 13 may both be straight tubes, for example, the second tube 14 and the first tube 13 may be concentric circular straight tubes, and correspondingly, the heat storage cavity is an annular cavity.

In other embodiments, as shown in FIG. 4 , the sub-regenerator 12 includes a first tube 13 , a second tube 14 , and a third tube 15 . They are sleeved in sequence, and a heat storage cavity is defined between the second tube 14 and the first tube 13 , and a heat exchange cavity 17 is respectively defined between the third tube 15 and the second tube 14 and the first tube 13 .

In other words, the first tube 13 defines the heat exchange cavity 17, the second tube 14 is sleeved outside the first tube 13, and the second tube 14 is radially spaced from the first tube 13, so that the second tube 14 and the first tube A heat storage cavity is defined between 13, the third pipe 15 is sleeved outside the second pipe 14, and the third pipe 15 and the second pipe 14 are radially spaced apart, so that the third pipe 15 and the second pipe 14 are limited out of the heat exchange chamber 17 . The heat storage chamber is isolated from the inner heat exchange chamber 17 by the first pipe 13 , and the heat storage chamber is isolated from the outer heat exchange chamber 17 by the second pipe 14 .

It should be noted that, in this embodiment, the heat exchange cavity 17 includes two layers, that is, the heat exchange cavity 17 is designed on both the inner and outer sides of the heat storage cavity, and the first tube 13 and the second tube 14 can be made of good thermal conductivity In order to facilitate heat exchange, the third tube 15 is covered with a thermal insulation layer. The heat exchange chambers 17 on the inner and outer sides of the heat storage chamber can work at the same time, and the heat exchange medium in the two heat exchange chambers 17 flows in the same direction, so that the heat exchange efficiency is higher.

The third tube 15 , the second tube 14 and the first tube 13 may all be straight tubes. For example, the third tube 15 , the second tube 14 and the first tube 13 may be concentric circular straight tubes. Correspondingly, the heat storage chamber It is an annular cavity, and the outer heat exchange cavity 17 is an annular cavity.

Of course, referring to the design idea of this embodiment, the sub-regenerator 12 also includes more layers, such as five layers of tubes, defining two layers of heat storage chambers and three layers of heat exchange chambers 17, two layers of heat storage chambers and three layers of heat storage chambers The heat exchange chambers 17 are alternately sleeved one by one.

According to the access-shared compressed air energy storage and heat storage system according to the embodiment of the present invention, during energy storage, the high-pressure and high-temperature air flows into the heat exchange chamber 17 of the sub-regenerator 12, and transfers heat to the heat storage chamber at the heat storage chamber. Medium 16 (using molten salt as an example). When releasing energy, the high-pressure and low-temperature air from the outlet of the gas storage device 20 passes through the heat exchange chamber 17 of the sub-regenerator 12, and is heated to a high temperature by the heat storage medium 16 at the heat storage chamber, and then the high-temperature and high-pressure air goes to the expander for expansion. Machine works. The heat storage device 10 is arranged in a straight pipe, which can reduce the flow resistance. The system can be modularly designed, and the storage and retrieval operations share a set of heat storage device 10 to reduce investment costs. By planning the compressor and expander to be arranged on both sides of the heat storage device 10, the pressure drop of the air flow path is further reduced.

In actual implementation, a plurality of concentric casing-type sub-regenerators 12 are connected in parallel to form a row of heat-accumulators 11 , and a plurality of heat-accumulators 11 are connected in parallel to form the entire heat-storage device 10 . Insulation treatment of the outer tube. Taking molten salt as the energy storage medium as an example, this scheme is mainly divided into two steps: energy storage and energy release.

When storing energy, the high temperature and high pressure air compressed by the compressor heats the molten salt located in the ring cavity through the heat exchange cavity 17 of the sub-regenerator 12, and the molten salt absorbs heat to heat up and melt. When all the molten salt of the target heat accumulator 11 reaches the design storage temperature, the branch control valve 18 of the current heat accumulator 11 is closed. The control valves 18 of the other regenerators 11 are opened, and so on. Each heat accumulator in the heat storage device 10 is added in sequence until all the heat accumulator branches reach the design heat storage temperature or the air pressure in the gas storage device 20 reaches the design pressure value.

When releasing energy, the high-pressure air at the outlet of the gas storage device 20 passes through the heat exchange cavity 17 of the sub-regenerator 12, and the molten salt in the heat storage cavity transfers heat to the air passing through the heat exchange cavity 17, and the air temperature increases. Then go to the expander to expand and do work. By controlling the opening and closing of the control valve 18 of each heat accumulator 11, the high-pressure air is heated through each heat accumulator 11 in turn, until the heat storage of the entire heat storage device is extracted or the high-pressure air in the air storage device 20 is released. .

The embodiment of the present invention provides an access shared compressed air energy storage and heat storage system. The system uses a concentric sleeve with a built-in heat storage interlayer as the core sub-regenerator 12 . The sub-regenerator 12 is a round straight tube. The air passing through the inner and outer ring cavities is absorbed and heated by filling a suitable heat storage medium 16 at the interlayer of the sub-regenerator 12, and the effect of heat storage and heat release is achieved. A heat accumulator 11 is formed by connecting a plurality of sub heat accumulators 12 in parallel, and then a whole heat storage device 10 is formed by connecting a plurality of heat accumulators 11 in parallel. A valve is set in front of each heat accumulator 11 to facilitate planning of the gas flow path in the process of storing and extracting heat.

The sub-regenerator 12 uses the annular cavity as a heat storage core to heat or cool the air in the inner tube, and has the functions of heat storage and heat exchange at the same time. The straight pipe arrangement can well reduce the pressure drop in the air flow path and improve the system efficiency. The energy storage and energy release links share a set of equipment, which reduces the investment of the entire system. During operation, the heat storage medium 16 does not need to flow, which also reduces operating costs. Modular design and management methods are conducive to large-scale production and capacity expansion, and can also reduce the difficulty of system investment and operation management.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An access sharing type compressed air energy storage and heat storage system is characterized by comprising:

the heat storage device comprises a plurality of heat accumulators, each heat accumulator is provided with a heat accumulation cavity filled with a heat accumulation medium and a heat exchange cavity isolated from the heat accumulation cavity, the heat exchange cavities of the plurality of heat accumulators are connected in parallel to a heat exchange flow path of the heat storage device, and at least part of the heat exchange cavities can be selectively communicated with the heat exchange flow path;

a compressor connected to the heat exchange flow path;

the inlet and the outlet of the gas storage device are respectively connected to the two ends of the heat exchange flow path;

an expander connected to the heat exchange flow path.

2. The access sharing type compressed air energy-storing and heat-storing system as claimed in claim 1, wherein the number of the compressors is plural, the plural compressors are connected in series, and the adjacent compressors along the compressed air path are distributed on the opposite side of the heat exchange flow path.

3. The access sharing type compressed air energy-storing and heat-storing system as claimed in claim 1, wherein the number of the expansion machines is plural, the plural expansion machines are connected in series, and the expansion machines adjacent to each other along the expansion gas path are distributed on the opposite side of the heat exchange flow path.

4. The access sharing type compressed air energy-storing and heat-storing system according to any one of claims 1 to 3, wherein the heat accumulator includes a plurality of sub heat accumulators each having the heat-storing chamber and the heat-exchanging chamber, and the plurality of heat-exchanging chambers of the same heat accumulator are synchronously connected to or disconnected from the heat-exchanging flow path.

5. The access sharing compressed air energy-storing and heat-storing system according to claim 4, wherein the sub-heat accumulator includes a first tube and a second tube, the second tube is sleeved outside the first tube, and the heat-storing cavity is defined between the second tube and the first tube, and the first tube defines the heat-exchanging cavity.

6. The access sharing type compressed air energy-storing and heat-storing system according to claim 4, wherein the sub-heat accumulator comprises a first pipe, a second pipe and a third pipe, the second pipe and the first pipe are sequentially sleeved from outside to inside, the heat-storing cavity is defined between the second pipe and the first pipe, and the heat-exchanging cavity is defined between the third pipe and the second pipe and between the first pipe.

7. The access sharing type compressed air energy and heat storage system as claimed in claim 4, wherein the heat exchange cavity is linear.

8. The access sharing type compressed air energy-storing and heat-storing system according to claim 4, wherein the heat exchange chambers of the sub heat accumulators of the same heat accumulator are connected in parallel.

9. The access sharing compressed air energy-storing and heat-storing system according to claim 8, wherein a plurality of the sub heat accumulators of the same heat accumulator are arranged side by side.

10. The access sharing compressed air energy-storing and heat-storing system according to claim 4, wherein the plurality of heat exchange chambers of the same heat accumulator are connected to the heat exchange flow path through a common control valve.

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