CN215170656U - Combined heat-storage compact compressed air energy storage system - Google Patents
Combined heat-storage compact compressed air energy storage system Download PDFInfo
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- CN215170656U CN215170656U CN202120800192.XU CN202120800192U CN215170656U CN 215170656 U CN215170656 U CN 215170656U CN 202120800192 U CN202120800192 U CN 202120800192U CN 215170656 U CN215170656 U CN 215170656U
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Abstract
A combined heat-storage compact compressed air energy storage system comprises a filling heat storage device, a shared loop, an air storage tank, an auxiliary loop and a work-doing loop, wherein the filling heat storage device is connected with the shared loop in series, the auxiliary loop is connected with the shared loop in parallel, the air storage tank and the work-doing loop are connected with a heat exchanger in the shared loop, a compressor and an expander are connected in the work-doing loop, the energy storage and energy release are both carried out by adopting the shared loop, and the shared loop is heated by the auxiliary loop in the energy release process. The utility model overcomes in the former system heat accumulation and release heat return circuit independent separately, occupation space is big, and the energy release process acting temperature can not reach the problem that requires to reduce conversion efficiency and influence the system stability. The system has the characteristics of simple structure, compact integration of all equipment and loops in the system, small occupied space, and capability of heating a shared loop by an auxiliary loop when the working temperature in the energy release process does not meet the requirement, improving the conversion efficiency of the system and improving the stability of the system.
Description
Technical Field
The utility model belongs to the technical field of the energy storage, a compact compressed air energy storage system of modular heat accumulation is related to.
Background
The compressed air energy storage technology can be divided into two types of complementary combustion type and non-complementary combustion type at present, although a compact heat storage system is proposed in patent CN105370408A, the heat storage range of a heat storage subsystem is low, water is adopted as a heat transfer medium and a heat storage medium, the investment cost can be reduced, but because the heat storage temperature and the heat release temperature are not high, the heat transferred to the air entering a turbine in the energy release process is low, and the overall efficiency of thermoelectric conversion needs to be improved. Patent CN105370408 adopts a high temperature heat storage subsystem, which can increase the temperature of the air entering the turbine to a higher temperature during the energy release process, thereby increasing the thermoelectric conversion efficiency of the system. However, in the technical scheme, two sets of equipment and two sets of pipelines are adopted for heat storage and heat release, so that the whole system occupies a large space; secondly, in the energy storage process, if the energy storage temperature does not reach the set value, the work conversion efficiency is low, and the system is unstable.
Disclosure of Invention
The utility model aims to solve the technical problem that a compact compressed air energy storage system of modular heat accumulation is provided, moreover, the steam generator is simple in structure, adopt to pack the heat accumulation device and establish ties with the sharing return circuit, the auxiliary circuit is parallelly connected with the sharing return circuit, gas holder and acting return circuit are connected with the heat exchanger in the sharing return circuit, be connected with compressor and expander in the acting return circuit, the energy storage all adopts the sharing return circuit with releasing energy, the energy release in-process auxiliary circuit heats the sharing return circuit, each equipment and return circuit integration are compact in the system, occupation space is little, when the energy release in-process acting temperature can not reach the requirement, the auxiliary circuit heats the sharing return circuit, improve system conversion efficiency and improve system stability.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a combined heat-storage compact compressed air energy storage system comprises a filling heat storage device, a shared loop, a gas storage tank, an auxiliary loop and an acting loop; the filling heat storage device is connected with the common loop in series, the auxiliary loop is connected with the common loop in parallel, the air storage tank and the working loop are connected with the heat exchanger in the common loop, and the compressor and the expansion machine are connected in the working loop; the energy storage and the energy release both adopt a common loop, and the auxiliary loop heats the common loop in the energy release process.
The filling heat storage device comprises a liquid storage tank connected with the filling bed, and the liquid inlet end of the filling bed and the liquid discharge end of the liquid storage tank are connected with a common loop.
And a heat exchanger and a shield pump are connected in series on a common pipeline of the common loop.
And an air pipe connected with the air storage tank is connected with the heat exchanger and shares the air pipe during air inlet and exhaust.
The auxiliary loop comprises a heater connected with the heating pipeline in series and a branch pipeline connected with the heating pipeline, two ends of the heating pipeline are respectively connected with the liquid storage tank and the shared loop, and the branch pipeline is connected with the shared loop.
And the working pipeline of the working loop is connected with a three-way reversing valve, two ends of the working pipeline are respectively connected with the compressor and the heat exchanger, and the expander is connected with the three-way reversing valve.
And the liquid inlet end of the packed bed of the packed heat storage device is provided with a pressure stabilizing system connected with the liquid inlet end.
And an expansion tank is connected in the common pipeline of the common loop.
The number of the packed beds, the heat exchangers, the gas storage tank, the compressor and the expander of the packed heat storage device is multiple.
A combined heat-storage compact compressed air energy storage system comprises a filling heat storage device, a shared loop, an air storage tank, an auxiliary loop and a work-doing loop, wherein the filling heat storage device is connected with the shared loop in series, the auxiliary loop is connected with the shared loop in parallel, the air storage tank and the work-doing loop are connected with a heat exchanger in the shared loop, a compressor and an expander are connected in the work-doing loop, the energy storage and energy release are both carried out by adopting the shared loop, and the shared loop is heated by the auxiliary loop in the energy release process. The utility model overcomes in the former system heat accumulation and release heat return circuit independent separately, occupation space is big, and the energy release process acting temperature can not reach the problem that requires to reduce conversion efficiency and influence the system stability. The system has the characteristics of simple structure, compact integration of all equipment and loops in the system, small occupied space, and capability of heating a shared loop by an auxiliary loop when the working temperature in the energy release process does not meet the requirement, improving the conversion efficiency of the system and improving the stability of the system.
Drawings
The invention will be further explained with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the thermal storage device according to the present invention.
Fig. 3 is a schematic structural diagram of the connection between the common loop and the filled heat storage device and the gas storage tank of the present invention.
Fig. 4 is a schematic structural diagram of the auxiliary circuit of the present invention.
Fig. 5 is the structure diagram of the utility model connecting the working loop and the gas storage tank with the heat exchanger.
Fig. 6 is another schematic structural diagram of the present invention.
Fig. 7 is another schematic structural diagram of the present invention.
In the figure: the device comprises a filling heat storage device 1, a filling bed 11, a liquid storage tank 12, a pressure stabilizing system 13, a common loop 2, a heat exchanger 21, a shield pump 22, an expansion tank 23, an air storage tank 3, an auxiliary loop 4, a heater 41, a branch pipeline 42, a working loop 5, a three-way reversing valve 51, a compressor 52 and an expander 53.
Detailed Description
As shown in fig. 1 to 7, a combined heat storage compact compressed air energy storage system includes a filling heat storage device 1, a common loop 2, an air storage tank 3, an auxiliary loop 4 and an acting loop 5; the filling heat storage device 1 is connected with the common loop 2 in series, the auxiliary loop 4 is connected with the common loop 2 in parallel, the gas storage tank 3 and the work applying loop 5 are connected with the heat exchanger 21 in the common loop 2, and the work applying loop 5 is connected with the compressor 52 and the expansion machine 53; the common loop 2 is adopted for energy storage and energy release, and the auxiliary loop 4 heats the common loop 2 in the energy release process. The integration of all devices and loops in the system is compact, the occupied space is small, and when the working temperature in the energy release process does not meet the requirement, the auxiliary loop 4 heats the shared loop 2, so that the conversion efficiency of the system is improved, and the stability of the system is improved.
Preferably, in the processes of energy storage and energy release, the liquid heat transfer medium circulates through the common loop 2, so that the length of the required pipeline is reduced, the equipment for driving the circulation of the liquid heat transfer medium adopts the shielding pump 22, the equipment is saved, the cost is reduced, the occupied space is small, and the whole structure is compact.
In a preferred scheme, the filling heat storage device 1 comprises a liquid storage tank 12 connected with a filling bed 11, and a liquid inlet end of the filling bed 11 and a liquid discharge end of the liquid storage tank 12 are connected with the common loop 2. The structure is simple, when in use, the packed bed 11 is used for absorbing the heat of the liquid heat transfer medium, and the liquid storage tank 12 is used for storing the liquid heat transfer medium discharged from the packed bed 11.
Preferably, the filler in the packed bed 11 is a solid heat storage material.
Preferably, the liquid heat transfer medium is a thermal oil.
Preferably, the packed bed 11 is a split flow packed bed or a trickle packed bed.
In a preferred embodiment, a heat exchanger 21 and a shield pump 22 are connected in series to a common line of the common circuit 2. The structure is simple, when in use, the liquid heat transfer medium in the liquid storage tank 12 enters the common loop 2, and the shield pump 22 drives the liquid heat transfer medium to circularly flow in the common loop 2.
Preferably, during energy storage, the shield pump 22 drives the liquid heat transfer medium in the common pipeline to circulate, the heat of the liquid heat transfer medium is taken away when the liquid heat transfer medium flows through the heat exchanger 21, the temperature of the liquid heat transfer medium is gradually increased, and the heat exchanger 21 converts high-temperature and high-pressure air into low-temperature and high-pressure air.
Preferably, when releasing energy, the shield pump 22 drives the liquid heat transfer medium in the common pipeline to circularly flow, when flowing through the heat exchanger 21, the liquid heat transfer medium conducts heat to the heat exchanger 21, the temperature of the heat exchanger 21 gradually increases, and the heat exchanger 21 converts low-temperature high-pressure air into high-temperature high-pressure air.
In a preferred scheme, an air pipe connected with the air storage tank 3 is connected with the heat exchanger 21, and the air pipe is shared during air inlet and air exhaust. Simple structure, during the use, 3 intake of gas holder and exhaust all share same trachea, and in the energy storage stage, the trachea is in the connected state, and after the energy storage, the valve on the trachea is closed, and in the energy release stage, opens the valve once more, has reduced the intercommunication pipeline between gas holder 3 and the heat exchanger 21, is favorable to saving space.
In a preferred embodiment, the auxiliary circuit 4 includes a heater 41 connected in series with the heating pipeline, and a branch pipeline 42 connected to the heating pipeline, wherein two ends of the heating pipeline are respectively connected to the liquid storage tank 12 and the common circuit 2, and the branch pipeline 42 is connected to the common circuit 2. The structure is simple, when the energy release device is used, when the working temperature in the energy release process does not meet the requirement, the auxiliary loop 4 heats the shared loop 2, the conversion efficiency of the system is improved, and the stability of the system in operation is improved.
Preferably, during the heating process of the heater 41, the liquid heat transfer medium is discharged from the receiver 12, flows into the heater 41 along the shield pump 22, is heated, flows through the heat exchanger 21 from the branch line 42, and then flows into the receiver 12 through the common line of the common circuit 2 to form a circulation loop.
Preferably, the liquid heat transfer medium does not flow through the packed bed 11 during warming of the heater 41.
In a preferred scheme, a work applying pipeline of the work applying loop 5 is connected with a three-way reversing valve 51, two ends of the work applying pipeline are respectively connected with a compressor 52 and a heat exchanger 21, and an expansion machine 53 is connected with the three-way reversing valve 51. The structure is simple, when in use, in the energy storage stage, the three-way reversing valve 51 on the acting pipeline conducts the compressor 52 and the heat exchanger 21, and the air inlet channel of the expander 53 is closed; in the energy releasing stage, the three-way reversing valve 51 conducts the heat exchanger 21 and the expander 53, and closes an exhaust passage of the heat exchanger 21; the connecting pipes between the compressor 52 and the expander 53 and the heat exchanger 21 are reduced, which is advantageous in saving space.
In a preferable scheme, a pressure stabilizing system 13 is arranged at the liquid inlet end of the packed bed 11 of the packed heat storage device 1 and is connected with the packed bed. Simple structure, during the use, the liquid inlet end of packed bed 11 is connected with voltage stabilizing system 13 and is used for before the system starts, the air in the discharge circuit.
Preferably, the pressure stabilizing system 13 comprises a pressure stabilizing device and a gas flow regulating valve which are sequentially connected in a pressure stabilizing pipeline, and one end of the gas flow regulating valve is connected with the liquid inlet end of the packed bed 11.
In a preferred embodiment, an expansion tank 23 is connected to the common line of the common circuit 2. The structure is simple, the expansion tank 23 is used for offsetting the pressure on the common pipeline of the common loop 2 when the liquid heat transfer medium is suddenly heated in the energy releasing process, and the working process is that when the pressure of the common pipeline is suddenly increased, part of the liquid heat transfer medium quickly enters the expansion tank 23, the pressure of the common pipeline is reduced, and the phenomenon of pipe explosion is avoided.
In a preferred embodiment, the number of the packed bed 11, the heat exchanger 21, the gas tank 3, the compressor 52, and the expander 53 in the packed thermal storage device 1 is plural. The structure is simple, and when the system is used, a plurality of packed beds 11, the heat exchanger 21, the gas storage tank 3, the compressor 52 and the expander 53 are organically combined, so that the conversion efficiency of the system is further improved.
Preferably, a plurality of packed beds 11 are connected in parallel with each other and then connected to the common circuit 2.
Preferably, a plurality of heat exchangers 21 are respectively connected in parallel to the common circuit 2.
Preferably, a plurality of air tanks 3 are connected in parallel to the common circuit 2.
Preferably, the plurality of compressors 52 are respectively connected with the plurality of expanders 53 to form a plurality of work circuits 5, and the plurality of work circuits 5 are respectively connected with the heat exchanger 21.
The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.
Claims (9)
1. The utility model provides a compact compressed air energy storage system of modular heat accumulation which characterized by: the system comprises a filling heat storage device (1), a common loop (2), an air storage tank (3) and an auxiliary loop (4); the filling heat storage device (1) is connected with the common loop (2) in series, the auxiliary loop (4) is connected with the common loop (2) in parallel, and the gas storage tank (3) is connected with the heat exchanger (21) in the common loop (2); the energy storage and the energy release both adopt a common loop (2), and an auxiliary loop (4) heats the common loop (2) in the energy release process.
2. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: the filling heat storage device (1) comprises a liquid storage tank (12) connected with the filling bed (11), and the liquid inlet end of the filling bed (11) and the liquid discharge end of the liquid storage tank (12) are connected with the common loop (2).
3. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: and a heat exchanger (21) and a shield pump (22) are connected in series on a common pipeline of the common loop (2).
4. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: and an air pipe connected with the air storage tank (3) is connected with the heat exchanger (21) and shares the air pipe during air intake and exhaust.
5. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: the auxiliary loop (4) comprises a heater (41) connected with the heating pipeline in series and a branch pipeline (42) connected with the heating pipeline, two ends of the heating pipeline are respectively connected with the liquid storage tank (12) and the common loop (2), and the branch pipeline (42) is connected with the common loop (2).
6. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: the device is characterized by further comprising a work applying loop (5), a three-way reversing valve (51) is connected to a work applying pipeline of the work applying loop (5), two ends of the work applying pipeline are respectively connected with the compressor (52) and the heat exchanger (21), and the expansion machine (53) is connected with the three-way reversing valve (51).
7. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: the liquid inlet end of a packed bed (11) of the packed heat storage device (1) is provided with a pressure stabilizing system (13) connected with the liquid inlet end.
8. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: an expansion tank (23) is connected in a common pipeline of the common loop (2).
9. The combined heat accumulating compact compressed air energy storage system of claim 1, wherein: the number of the packed beds (11) and the heat exchangers (21), the gas storage tank (3), the compressor (52), and the expander (53) of the packed heat storage device (1) is plural.
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| CN202120800192.XU CN215170656U (en) | 2021-04-19 | 2021-04-19 | Combined heat-storage compact compressed air energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113062849A (en) * | 2021-04-19 | 2021-07-02 | 中国长江三峡集团有限公司 | Combined heat-storage compact compressed air energy storage system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113062849A (en) * | 2021-04-19 | 2021-07-02 | 中国长江三峡集团有限公司 | Combined heat-storage compact compressed air energy storage system and method |
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