Photo-thermal and photovoltaic coupled compressed air energy storage device

Abstract

The utility model belongs to the technical field of compressed air energy storage, and particularly relates to a photo-thermal and photovoltaic coupled compressed air energy storage device which comprises an air storage tank, an air compressor unit, a power supply unit, a power generation assembly and a grid connection assembly, an air inlet of the air storage tank is connected with an air outlet of the air compressor unit through a pipe divider, and the air compressor unit is connected with a power generation assembly; an exhaust port of the gas storage tank communicates with the power generation assembly through a gas guide pipe. The power generation assembly is electrically connected with the grid connection assembly. A water outlet of the heat preservation water tank is connected with the heat storage assembly and the heat exchange assembly, and a water inlet of the heat preservation water tank is connected with the main backflow pipe. On one hand, the problem that energy is wasted due to the fact that an existing compressed air energy storage device releases heat to the outside in the compressed air stage is solved; and on the other hand, the problems that in the deflation and energy release stage of the device, due to the fact that high-pressure gas absorbs heat, the surrounding air temperature drops rapidly, blades of the generator set are frosted, the generator set needs to be additionally heated, and the air energy storage efficiency is affected are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressed air energy storage, and in particular relates to a compressed air energy storage device coupled with photothermal and photovoltaic. Background Art

[0002] With the promotion and development of new energy technologies in my country in recent years, the installed capacity of solar thermal power generation and photovoltaic power generation has grown rapidly. In order to reasonably distribute these clean energy, electric energy is used to compress air during the low load period of the power grid to increase the potential energy of the air. During the peak load period of the power grid, compressed air is released to drive the steam turbine to generate electricity. At present, the compressed air energy storage device is mainly composed of a compressor unit, a gas storage container, a generator unit and a power distribution system.

[0003] A compressed air energy storage device system and method coupled with photothermal and photovoltaic (CN202311399334.6), including a photothermal module, a photovoltaic module and a compressed air energy storage module; the compressed air energy storage module includes an air compression device, a heat exchange device, an air storage device, a heat recovery device, a solid heating device, a molten salt heating device and a turbine connected in sequence.

[0004] However, this type of compressed air energy storage device has the following shortcomings in actual applications: First, in the process of compressing the air, the air is compressed by the compressor and becomes a high-temperature and high-pressure state, releasing heat to the outside world. The heat is discharged to the outside world in the form of waste heat, and the waste heat cannot be utilized, resulting in energy loss; second, in the process of degassing and releasing energy, the high-pressure gas absorbs heat, causing the surrounding temperature to drop rapidly, and the low-temperature gas flows into the generator set, causing frost on the blades of the generator set, so the generator set needs to be additionally heated, affecting the efficiency of compressed air energy storage. Utility Model Content

[0005] The purpose of the utility model is to provide a compressed air energy storage device coupled with solar thermal photovoltaics. On the one hand, it solves the problem that the existing compressed air energy storage device releases heat to the outside during the compressed air stage, causing energy waste; on the other hand, it solves the problem that during the device's degassing and energy release stage, the surrounding temperature drops rapidly due to the high-pressure gas absorbing heat, causing frost on the blades of the generator set, so the generator set needs to be additionally heated, affecting the efficiency of air energy storage.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A compressed air energy storage device coupled with solar thermal photovoltaic comprises: an air storage tank, an air compressor unit, a power supply unit, a power generation component and a grid-connected component, wherein the air inlet of the air storage tank is connected to the air outlet of the air compressor unit through a manifold, and the air compressor unit is connected to the power generation unit; the exhaust port of the air storage tank is connected to the power generation component through an air guide pipe, and the power generation component is electrically connected to the grid-connected component; further comprising: an insulated water tank, wherein the water outlet of the insulated water tank is respectively connected to the heat storage component and the heat exchange component, and the water inlet of the insulated water tank is connected to the main return pipe; the heat storage component comprises: a heat storage circulation pump and a heat accumulator, and the water inlet of the heat storage circulation pump is connected to the insulated water tank. The heat exchange assembly comprises: a heat exchange circulation pump and a heat exchanger, the water inlet of the heat exchange circulation pump is connected to the heat exchanger fixed on the power generation assembly through a heat exchange pipeline, the water outlet of the heat accumulator is connected to the main return pipe through a heat storage return pipe, and when the compressed air is stored in energy, the water transported by the heat storage pipeline is sent back to the insulation water tank through the heat transfer of the heat accumulator; the heat exchange assembly comprises: a heat exchange circulation pump and a heat exchanger, the water inlet of the heat exchange circulation pump is connected to the insulation water tank, the water outlet of the heat exchange circulation pump is connected to the heat exchanger fixed on the power generation assembly through a heat exchange pipeline, the water outlet of the heat exchanger is connected to the main return pipe through a heat exchange return pipe, and when the air is released to release energy, the water transported by the heat exchange pipeline is sent back to the insulation water tank through the heat exchange of the heat exchanger.

[0008] Furthermore, the heat storage pipeline includes a heat storage main pipe and a heat storage branch pipe, the water inlet of the heat storage main pipe is connected to the heat storage circulation pump, the water outlet of the heat storage main pipe is connected to the heat storage branch pipe, and the heat storage branch pipe is connected to the water inlet of the heat accumulator.

[0009] Furthermore, the heat exchange pipeline includes a heat exchange main pipe and a heat exchange branch pipe, the water inlet of the heat exchange main pipe is connected to the heat exchange circulation pump, the water outlet of the heat exchange main pipe is connected to the heat exchange branch pipe, and the heat exchange branch pipe is connected to the heat exchanger.

[0010] Furthermore, the power supply unit includes an energy storage distribution cabinet and an energy storage transformer electrically connected to the energy storage distribution cabinet, the input end of the energy storage transformer is electrically connected to an inverter, and the input end of the inverter is electrically connected to a solar thermal power generation group and a photovoltaic power generation group.

[0011] Furthermore, the energy storage distribution cabinet is electrically connected to the air compressor unit, the air outlet of the air compressor unit is fixedly connected to a compressed air pipe, the compressed air pipe is fixedly connected to a manifold, and a first one-way valve is fixedly installed at the connection between the compressed air pipe and the manifold.

[0012] Furthermore, the power generation component is a turbine generator set, the air duct includes an air main pipe and a power generation pipe fixedly connected to the air main pipe, a solenoid valve is fixedly installed in the middle of the power generation pipe, and the air outlet of the power generation pipe is connected to the turbine generator set.

[0013] Furthermore, the grid-connected component includes a grid-connected power distribution cabinet and a grid-connected transformer electrically connected to the grid-connected power distribution cabinet, and the turbine generator set is electrically connected to the grid-connected power distribution cabinet.

[0014] Furthermore, a second one-way valve is fixedly installed in the middle of the heat storage reflux pipe.

[0015] Furthermore, a third one-way valve is fixedly installed in the middle of the heat exchange reflux pipe.

[0016] Furthermore, an electric heater is fixedly installed inside the thermal insulation water tank.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model adds a heat storage component and a heat exchange component on the basis of traditional compressed air energy storage, wherein the heat storage component and the heat exchange component are respectively connected to the water outlet of the thermal insulation water tank. When compressed air is stored, the liquid enters the heat storage pipeline through the heat storage circulation pump, and the heat storage pipeline sends the liquid to the heat accumulator. Since the heat accumulator is connected to the air compressor unit, it can collect the waste heat generated by the air compressor and transfer it to the liquid. The liquid finally returns to the thermal insulation water tank through the heat storage return pipe and the main return pipe. When the air is released to release energy, the high-temperature liquid enters the heat exchange pipeline through the heat exchange circulation pump, and the heat exchange pipeline sends the liquid to the heat exchanger, which is responsible for providing additional temperature to the temperature of the turbine generator unit. The liquid finally returns to the thermal insulation water tank through the heat exchange return pipe and the main return pipe. Through these two methods, the former can convert the high-temperature waste heat generated by the compressed gas of the air compressor unit into the liquid temperature of the heat exchange liquid through the heat storage component, and perform thermal insulation and heat storage. The latter can increase the temperature of the turbine generator set through the heat exchange component, thereby reducing the turbine generator set working under low temperature conditions for a long time, causing blade frost, and reducing the failure rate of power generation.

[0019] (2) The utility model fixes an electric heater inside the insulated water tank to ensure auxiliary heating when the internal temperature is insufficient, thereby ensuring the stable operation of the turbine generator set, utilizing waste heat, and reducing the energy consumption caused by the need to heat the generator set during power generation, thereby improving energy storage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the thermal insulation water tank of the utility model;

[0022] Figure 3 This is a schematic diagram of the energy storage principle structure of the utility model;

[0023] Figure 4It is a structural schematic diagram of part A of the utility model.

[0024] In the figure: 1. gas storage tank; 2. manifold; 3. solar thermal power generation unit; 4. photovoltaic power generation unit; 5. inverter; 6. energy storage transformer; 7. energy storage distribution cabinet; 8. air compressor unit; 9. compressed air pipe; 10. first one-way valve; 11. air guide pipe; 12. power generation pipe; 13. turbine generator unit; 14. solenoid valve; 15. grid-connected distribution cabinet; 16. grid-connected transformer; 17. insulated water tank; 18. heat storage circulation pump; 19. heat storage pipe; 20. heat storage branch pipe; 21. heat accumulator; 22. heat storage return pipe; 23. second one-way valve; 24. main return pipe; 25. heat exchange circulation pump; 26. heat exchange pipe; 27. heat exchange branch pipe; 28. heat exchanger; 29. ​​third one-way valve; 30. electric heater; 31. heat exchange return pipe. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0026] like Figure 1-Figure 4 As shown, in this embodiment, it includes: an air storage tank 1, an air compressor unit 8, a power supply unit, a power generation component and a grid-connected component. The air inlet of the air storage tank 1 is connected to the air outlet of the air compressor unit 8 through a manifold 2, and the air compressor unit 8 is connected to the power generation unit; the exhaust port of the air storage tank 1 is connected to the power generation component through an air guide pipe, and the power generation component is electrically connected to the grid-connected component;

[0027] It also includes: an insulated water tank 17, the water outlet of the insulated water tank 17 is connected to the heat storage component and the heat exchange component respectively, and the water inlet of the insulated water tank 17 is connected to the main return pipe 24;

[0028] The heat storage component includes: a heat storage circulation pump 18 and a heat accumulator 21, the water inlet of the heat storage circulation pump 18 is connected to the heat preservation water tank 17, the water outlet of the heat storage circulation pump 18 is connected to the heat accumulator 21 fixed on the air compressor unit 8 through a heat storage pipeline, and the water outlet of the heat accumulator 21 is connected to the main return pipe 24 through a heat storage return pipe 22;

[0029] The heat exchange component includes: a heat exchange circulation pump 25 and a heat exchanger 28. The water inlet of the heat exchange circulation pump 25 is connected to the insulation water tank 17, and the water outlet of the heat exchange circulation pump 25 is connected to the heat exchanger 28 fixed on the power generation component through a heat exchange pipeline. The water outlet of the heat exchanger 28 is connected to the main return pipe 24 through a heat exchange return pipe 31.

[0030] In this embodiment, the heat storage pipeline includes a heat storage main pipe 19 and a heat storage branch pipe 20. The water inlet of the heat storage main pipe 19 is connected to the heat storage circulation pump 18, the water outlet of the heat storage main pipe 19 is connected to the heat storage branch pipe 20, and the heat storage branch pipe 20 is connected to the water inlet of the heat accumulator 21.

[0031] It should be noted that the air compressor group 8 is divided into four air compressors, each of which is provided with a heat accumulator 21 , and the heat storage branch pipes 20 are respectively connected to the heat accumulators 21 thereon.

[0032] In this embodiment, the heat exchange pipeline includes a heat exchange main pipe 26 and a heat exchange branch pipe 27 . The water inlet of the heat exchange main pipe 26 is connected to the heat exchange circulation pump 25 , the water outlet of the heat exchange main pipe 26 is connected to the heat exchange branch pipe 27 , and the heat exchange branch pipe 27 is connected to the heat exchanger 28 .

[0033] In this embodiment, the power supply unit includes an energy storage distribution cabinet 7 and an energy storage transformer 6 electrically connected to the energy storage distribution cabinet 7, the input end of the energy storage transformer 6 is electrically connected to the inverter 5, and the input end of the inverter 5 is electrically connected to the solar thermal power generation group 3 and the photovoltaic power generation group 4.

[0034] Specifically, during the period of low electricity consumption, the direct current generated by the solar thermal power generation group 3 and the photovoltaic power generation group 4 is inverted into alternating current by the inverter 5. After the voltage is adjusted by the energy storage transformer 6, the electric energy is distributed through the energy storage distribution cabinet 7 to make the air compressor group 8 work.

[0035] In this embodiment, the energy storage distribution cabinet 7 is electrically connected to the air compressor unit 8, the air outlet of the air compressor unit 8 is fixedly connected to a compressed air pipe 9, the compressed air pipe 9 is fixedly connected to the manifold 2, and a first one-way valve 10 is fixedly installed at the connection between the compressed air pipe 9 and the manifold 2.

[0036] In this embodiment, the power generation component is a turbine generator set 13, and the air duct includes an air main pipe 11 and a power generation pipe 12 fixedly connected to the air main pipe 11. A solenoid valve 14 is fixedly installed in the middle of the power generation pipe 12, and the air outlet of the power generation pipe 12 is connected to the turbine generator set 13.

[0037] It should be noted that the turbine generator set 13 is divided into four turbine generators, and a heat exchanger 28 is arranged next to each turbine generator.

[0038] Specifically, during the peak period of electricity consumption, the solenoid valve 14 is opened. At this time, the high-pressure gas in the gas storage tank 1 will flow into the power generation pipe 12 through the gas guide pipe 11, and finally enter the turbine generator set 13, driving the turbine generator set 13 to work. The generated electric energy is collected in the grid-connected distribution cabinet 15, and after being boosted by the grid-connected transformer 16, it is connected to the power grid.

[0039] In this embodiment, the grid-connected components include a grid-connected power distribution cabinet 15 and a grid-connected transformer 16 electrically connected to the grid-connected power distribution cabinet 15 , and the turbine generator set 13 is electrically connected to the grid-connected power distribution cabinet 15 .

[0040] In this embodiment, a second one-way valve 23 is fixedly installed in the middle of the heat storage return pipe 22 .

[0041] In this embodiment, a third one-way valve 29 is fixedly installed in the middle of the heat exchange return pipe 31 .

[0042] In this embodiment, an electric heater 30 is fixedly installed inside the thermal insulation water tank 17 .

[0043] It should be noted that during the energy release stage, if the temperature in the heat exchange branch pipe 27 is lower than the set value due to heat exchange, the electric heater 30 will perform auxiliary heating to increase the temperature of the heat exchange fluid to ensure that the turbine generator set 13 can work normally.

[0044] The working process is as follows:

[0045] During the compressed gas energy storage stage, the heat storage circulation pump 18 will continue to pump the heat exchange fluid in the insulated water tank 17, so that it will be diverted to the heat storage branch pipe 20 through the heat storage main pipe 19, and finally flow into the corresponding heat accumulator 21, absorbing the high temperature generated when the air compressor unit 8 is working. The heat exchange fluid carrying heat flows into the main return pipe 24 through the heat storage return pipe 22, and finally flows back into the insulated water tank 17, increasing the heat in the insulated water tank 17.

[0046] During the energy release stage, the heat exchange circulation pump 25 will continue to pump the high-temperature heat exchange liquid in the insulation water tank 17, so that it will be diverted to the heat exchange branch pipe 27 through the heat exchange main pipe 26, and finally flow into the corresponding heat exchanger 28, which is used to increase the working temperature of the turbine generator set 13 to prevent the turbine generator set 13 from working in a low temperature environment for a long time and causing frost on the turbine blades. The cooled heat exchange liquid will flow into the main return pipe 24 through the heat exchange return pipe 31, and finally flow back to the insulation water tank 17.

[0047] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A compressed air energy storage device coupled with photothermal and photovoltaic, comprising: An air storage tank (1), an air compressor unit (8), a power supply unit, a power generation component and a grid-connected component, wherein the air inlet of the air storage tank (1) is connected to the air outlet of the air compressor unit (8) via a manifold (2), and the air compressor unit (8) is connected to the power generation unit; the air outlet of the air storage tank (1) is connected to the power generation component via an air guide pipe, and the power generation component is electrically connected to the grid-connected component; It is characterized in that it also comprises: a heat preservation water tank (17), the water outlet of the heat preservation water tank (17) is respectively connected to the heat storage component and the heat exchange component, and the water inlet of the heat preservation water tank (17) is connected to the main return pipe (24); The heat storage component comprises: a heat storage circulation pump (18) and a heat accumulator (21); a water inlet of the heat storage circulation pump (18) is connected to a heat preservation water tank (17); a water outlet of the heat storage circulation pump (18) is connected to a heat accumulator (21) fixed on an air compressor unit (8) via a heat storage pipeline; a water outlet of the heat accumulator (21) is connected to a main return pipe (24) via a heat storage return pipe (22); when compressed air is used to store energy, water transported by the heat storage pipeline is returned to the heat preservation water tank (17) via heat transfer in the heat accumulator (21); The heat exchange component comprises: a heat exchange circulation pump (25) and a heat exchanger (28); the water inlet of the heat exchange circulation pump (25) is connected to a heat preservation water tank (17); the water outlet of the heat exchange circulation pump (25) is connected to a heat exchanger (28) fixed on a power generation component via a heat exchange pipeline; the water outlet of the heat exchanger (28) is connected to a main return pipe (24) via a heat exchange return pipe (31); when venting and releasing energy, the water transported by the heat exchange pipeline is returned to the heat preservation water tank (17) through heat exchange in the heat exchanger (28).

2. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: The heat storage pipeline comprises a heat storage main pipe (19) and a heat storage branch pipe (20); the water inlet of the heat storage main pipe (19) is connected to a heat storage circulation pump (18); the water outlet of the heat storage main pipe (19) is connected to the heat storage branch pipe (20); and the heat storage branch pipe (20) is connected to the water inlet of a heat accumulator (21).

3. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: The heat exchange pipeline comprises a heat exchange main pipe (26) and a heat exchange branch pipe (27); the water inlet of the heat exchange main pipe (26) is connected to a heat exchange circulation pump (25); the water outlet of the heat exchange main pipe (26) is connected to the heat exchange branch pipe (27); and the heat exchange branch pipe (27) is connected to a heat exchanger (28).

4. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: The power supply unit comprises an energy storage distribution cabinet (7) and an energy storage transformer (6) electrically connected to the energy storage distribution cabinet (7); the input end of the energy storage transformer (6) is electrically connected to an inverter (5); and the input end of the inverter (5) is electrically connected to a solar thermal power generation unit (3) and a photovoltaic power generation unit (4).

5. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 4, characterized in that: The energy storage distribution cabinet (7) is electrically connected to the air compressor unit (8); the air outlet of the air compressor unit (8) is fixedly connected to a compressed air pipe (9); the compressed air pipe (9) is fixedly connected to the manifold (2); and a first one-way valve (10) is fixedly installed at the connection between the compressed air pipe (9) and the manifold (2).

6. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: The power generation component is a turbine generator set (13), the air duct comprises an air duct main pipe (11) and a power generation pipe (12) fixedly connected to the air duct main pipe (11), a solenoid valve (14) is fixedly installed in the middle of the power generation pipe (12), and the air outlet of the power generation pipe (12) is connected to the turbine generator set (13).

7. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 6, characterized in that: The grid-connected component comprises a grid-connected power distribution cabinet (15) and a grid-connected transformer (16) electrically connected to the grid-connected power distribution cabinet (15), and the turbine generator set (13) is electrically connected to the grid-connected power distribution cabinet (15).

8. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: A second one-way valve (23) is fixedly installed in the middle of the heat storage return pipe (22).

9. The compressed air energy storage device coupled with photothermal and photovoltaic according to claim 1, characterized in that: A third one-way valve (29) is fixedly installed in the middle of the heat exchange reflux pipe (31).

10. The compressed air energy storage device coupled with solar-thermal-photovoltaic according to claim 1, characterized in that: An electric heater (30) is fixedly installed inside the thermal insulation water tank (17).

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