A sea-based dish-type solar energy photo-thermal energy storage system

Abstract

The application discloses a kind of offshore dish type solar energy photo-thermal energy storage systems, including dish type solar energy photo-thermal power generation module located in offshore platform and part of compressed air energy storage module located in seabed, dish type solar energy photo-thermal power generation module includes dish-shaped parabolic reflector, heat absorber, first heat exchanger, stirling engine and first generator;Compressed air energy storage module includes compressor, heat accumulator, gas tank and second heat exchanger;Dish type solar energy photo-thermal power generation module and compressed air energy storage module are combined, and solar energy photo-thermal residual heat is stored in the form of high-pressure air pressure energy, when insufficient illumination or night, power generation is carried out using compressed air energy storage module, realize the smooth output of electric energy, solve the problem of new energy power generation randomness, intermittence, fluctuation, effectively expand solar energy photo-thermal power generation application scenario.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solar thermal power generation, and particularly relates to an offshore dish-type solar thermal energy storage system. BACKGROUND

[0002] Solar thermal power generation technology is generally divided into trough type, tower type, dish type and linear Fresnel type. Among them, the dish-type solar thermal power generation system uses a dish-shaped parabolic reflector to focus sunlight, and a heat absorber at the focal point absorbs solar radiation to heat the hot end of a Stirling engine. The working medium in the Stirling engine expands and pushes the piston to move, thereby driving the generator to generate electricity. Compared with the other three types of thermal power generation technologies, the dish-type solar thermal power generation system has high concentration ratio and operating temperature, small single machine capacity, and flexible layout, and is very suitable for establishing a distributed energy system.

[0003] Coastal areas have vast oceans and high electricity demand. Developing offshore thermal power generation technology not only effectively saves land resources, but also shortens the distance between power generation and power consumption, reducing transmission costs. At present, the dish-type solar thermal power generation system is mainly located inland, and cannot stably output electric energy at night or when the light is insufficient. How to effectively utilize the characteristics of the dish-type solar thermal power generation technology, solve the problems of randomness, intermittency and volatility of new energy power generation, and expand the application scenarios of solar thermal power generation is a problem to be solved in the future. SUMMARY

[0004] In view of the problems in the prior art, the present application provides an offshore dish-type solar thermal energy storage system, which can not only convert solar energy into electric energy output, but also convert it into pressure energy storage of compressed air. The storage and discharge pressure of compressed air can also be flexibly adjusted, solving the problems of randomness, intermittency and volatility of new energy power generation, and expanding the application scenarios of solar thermal power generation.

[0005] The application is realized by the following technical solutions:

[0006] An offshore dish-type solar thermal energy storage system comprises,

[0007] A dish-type solar thermal power generation module located on a sea platform and a compressed air energy storage module partially located on the seabed;

[0008] The dish type solar light and heat power generation module comprises a dish type parabolic reflector, a heat absorber, a first heat exchanger, a Stirling engine and a first generator; the dish type parabolic reflector is installed on a sea platform through a support component, incident light is irradiated on the mirror surface of the dish type parabolic reflector to form reflected light, a plurality of reflected light converges at a focal point, and the heat absorber is located at the focal point where the reflected light converges; the heat absorber is connected with the first heat exchanger through a support mechanism; the input end of the Stirling engine is connected with the low temperature side of the first heat exchanger, and the output end of the Stirling engine is connected with the first generator.

[0009] The compressed air energy storage module comprises a compressor, a heat accumulator, a gas storage tank and a second heat exchanger; the inlet of the compressor is connected with the atmosphere; the outlet of the compressor is connected with the heat storage side inlet of the heat accumulator, the heat release side outlet of the heat accumulator is connected with the low temperature side inlet of the second heat exchanger; the gas storage tank is connected with the heat accumulator, and the gas storage tank is located on the seabed.

[0010] Preferably, the compressed air energy storage module further comprises a circulating pump, a cold tank and a hot tank.

[0011] The outlet of the cold tank is connected with the inlet of the circulating pump, the outlet of the circulating pump is connected with the inlet of the high temperature section of the low temperature side of the first heat exchanger, the outlet of the high temperature section of the low temperature side of the first heat exchanger is connected with the inlet of the hot tank, the outlet of the hot tank is connected with the inlet of the high temperature side of the second heat exchanger, and the outlet of the high temperature side of the second heat exchanger is connected with the inlet of the cold tank.

[0012] Preferably, the support component comprises a reflector first support, a reflector second support, a reflector first rotating shaft and a reflector second rotating shaft; the dish type parabolic reflector is fixed at one end of the reflector first support, the other end of the reflector first support is connected with one end of the reflector second support through the reflector first rotating shaft, and the other end of the reflector second support is connected with the reflector second rotating shaft; the reflector first support and the reflector second support can rotate through the reflector first rotating shaft and the reflector second rotating shaft.

[0013] Preferably, the support mechanism comprises a heat absorber first support and a heat absorber second support; the inlet of the heat absorber is connected with one end of the heat absorber first support, the outlet of the heat absorber is connected with one end of the heat absorber second support, the other end of the heat absorber second support is connected with the inlet of the high temperature side of the first heat exchanger, and the other end of the heat absorber first support is connected with the outlet of the high temperature side of the first heat exchanger.

[0014] Preferably, the heat absorber is provided with a heat absorber rotating shaft, and the heat absorber rotating shaft is connected with the heat absorber first support and the heat absorber second support respectively.

[0015] Preferably, the first support of the heat absorber is provided with a heat-absorbing medium inflow channel, the second support of the heat absorber is provided with a heat-absorbing medium outflow channel, the low-temperature heat-conducting oil flowing out of the high-temperature side outlet of the first heat exchanger passes through the heat-absorbing medium inflow channel in the first support of the heat absorber to reach the heat absorber, absorbs solar radiation to become high-temperature heat-conducting oil, and then passes through the heat-absorbing medium outflow channel in the second support of the heat absorber to reach the high-temperature side inlet of the first heat exchanger, so that heat energy is transferred through the first heat exchanger.

[0016] Preferably, the heat storage side outlet of the heat storage device is connected to the inlet of the gas storage tank through a gas inlet pipe, the outlet of the gas storage tank is connected to the heat release side inlet of the heat storage device through a gas outlet pipe, the gas inlet pipe is provided with a gas inlet valve, and the gas outlet pipe is provided with a gas outlet valve.

[0017] Preferably, the lower part of the tank body of the gas storage tank is provided with a first liquid discharge valve and a second liquid discharge valve on the two sides, respectively.

[0018] Preferably, the low-temperature side outlet of the second heat exchanger is connected to the inlet of a turbine, and the turbine is connected to the second generator.

[0019] Preferably, the working medium of the Stirling engine is helium, and the offshore platform is built through a steel frame.

[0020] Compared with the prior art, the present application has the following beneficial technical effects:

[0021] The present application provides an offshore dish-type solar thermal energy storage system, which comprises a dish-type solar thermal power generation module located on an offshore platform and a compressed air energy storage module located partially on the seabed. The dish-type solar thermal power generation module and the compressed air energy storage module are combined to store the residual heat of solar thermal energy in the form of high-pressure air pressure energy. When the light is insufficient or at night, the compressed air energy storage module is used to generate electricity, realizing the stable output of electric energy. The problems of randomness, intermittency and volatility of new energy power generation are solved, and the application scenarios of solar thermal power generation are expanded. The system not only converts solar energy into electric energy output, but also converts it into pressure energy storage of compressed air. The storage and discharge pressure of compressed air can also be flexibly adjusted. Land resources are saved, and marine resources are fully utilized. The offshore dish-type solar thermal energy storage system can provide electric energy for offshore oil platforms, offshore lighthouses and the like.

[0022] Further, the present application uses the drainage method to realize the storage and release of air, and adjusts the depth of the gas storage tank in the sea to adjust the storage and discharge pressure.

[0023] Further, the offshore platform of the present application is built through a steel frame, so that the height of the offshore platform can be flexibly adjusted to adapt to different sea depths.

[0024] Further, the gas storage tank of the present application has liquid discharge valves on the two sides of the lower part of the tank body, and the depth of the gas storage tank in the sea can be adjusted to adjust the storage and discharge pressure.

[0025] Furthermore, the heat absorber of the present invention is provided with a heat absorber shaft, which allows the heat absorber to rotate freely and fully absorb heat.

[0026] Furthermore, the disc-shaped parabolic reflector of the present invention can rotate freely via the first axis and the second axis of the reflector, and can be adjusted according to the angle of light to fully receive light. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the offshore dish-type solar thermal energy storage system of the present invention.

[0028] In the diagram: 1-Disc parabolic reflector; 2-First support for the reflector; 3-First rotating shaft of the reflector; 4-Second support for the reflector; 5-Second rotating shaft of the reflector; 6-Heat absorber rotating shaft; 7-Heat absorber; 8-Second support for the heat absorber; 9-Heat absorber medium outflow channel; 10-First support for the heat absorber; 11-Heat absorber medium inflow channel; 12-First heat exchanger; 13-Stirling engine; 14-Stirling engine input end; 15-Stirling engine Engine output end; 16-First generator; 17-Compressor; 18-Heat accumulator; 19-Intake valve; 20-Exhaust valve; 21-Intake pipe; 22-Exhaust pipe; 23-Second heat exchanger; 24-Turbine; 25-Second generator; 26-Circulation pump; 27-Hot tank; 28-Cold tank; 29-Air tank; 30-First drain valve, 31-Second drain valve; 32-Incident ray; 33-Reflected ray; 34-Offshore platform. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] like Figure 1 As shown, an offshore dish-type solar thermal energy storage system includes a dish-type solar thermal power generation module located on an offshore platform and a compressed air energy storage module partially located on the seabed.

[0032] The dish type solar light and heat power generation module comprises a dish type parabolic reflector 1, a heat absorber 7, a reflector first support 2, a reflector second support 4, a reflector first rotating shaft 3, a reflector second rotating shaft 5, a heat absorber first support 10, a heat absorber second support 8, a heat absorber rotating shaft 6, a heat absorber medium inflow channel 11, a heat absorber medium outflow channel 9, a first heat exchanger 12, a Stirling engine 13, and a first generator 16;

[0033] The dish type parabolic reflector 1 is fixed at one end of the reflector first support 2, and the other end of the reflector first support 2 is connected to one end of the reflector second support 4 through the reflector first rotating shaft 3, and the other end of the reflector second support 4 is connected to the reflector second rotating shaft 5, thereby forming a light receiving mechanism which can rotate around the reflector first rotating shaft 3 and the reflector second rotating shaft 5.

[0034] The dish type parabolic reflector 1 is coated with a coating with high reflectivity, and the incident light 32 is irradiated on the mirror surface of the dish type parabolic reflector 1 to form reflected light 33, and a plurality of reflected light 33 converges at the focal point. In this example, the reflector first support 2 and the reflector second support 4 can rotate through the reflector first rotating shaft 3 and the reflector second rotating shaft 5 to always face the sun, thereby ensuring the heat collection efficiency.

[0035] The heat absorber 7 is located at the focal point where the reflected light 33 of the dish type parabolic reflector 1 converges, and is connected to the heat absorber first support 10 and the heat absorber second support 8 through the heat absorber rotating shaft 6, wherein the inlet of the heat absorber 7 is connected to one end of the heat absorber first support 10, the outlet of the heat absorber 7 is connected to one end of the heat absorber second support 8, the other end of the heat absorber second support 8 is connected to the high temperature side inlet of the first heat exchanger 12, and the other end of the heat absorber first support 10 is connected to the high temperature side outlet of the first heat exchanger 12. The heat absorber first support 10 is provided with the heat absorber medium inflow channel 11, and the heat absorber second support 8 is provided with the heat absorber medium outflow channel 9, thereby forming a heat absorbing mechanism which can rotate around the heat absorber rotating shaft.

[0036] In this embodiment, the low temperature heat conducting oil flowing out of the high temperature side outlet of the first heat exchanger 12 passes through the heat absorber medium inflow channel 11 in the heat absorber first support 10 to reach the heat absorber 7, absorbs solar radiation to be heated to high temperature heat conducting oil, and then passes through the heat absorber medium outflow channel 9 in the heat absorber second support 8 to reach the high temperature side inlet of the first heat exchanger 12, thereby realizing the heat energy transfer through the first heat exchanger 12.

[0037] The low temperature side of the first heat exchanger comprises a high temperature section and a low temperature section, the input end 14 of the Stirling engine is connected to the low temperature section of the low temperature side of the first heat exchanger 12, the output end 15 of the Stirling engine is connected to the first generator 16, thereby forming a Stirling engine set.

[0038] In this embodiment, helium is used as the working substance of the Stirling engine 13, which absorbs heat from the low-temperature side of the first heat exchanger 12, expands, pushes the piston to reciprocate, drives the first generator 16 to generate electricity, and realizes the conversion of solar energy into electrical energy.

[0039] The offshore platform 34 is built by a steel frame, and the above-mentioned disc-shaped solar thermal power generation module is placed on the platform.

[0040] The compressed air energy storage module includes a hot tank 27, a cold tank 28, a circulating pump 26, a second heat exchanger 23, a turbine 24, a second generator 25, a compressor 17, a heat accumulator 18, a gas storage tank 29, an air inlet pipe 21, an air outlet pipe 22, an air inlet valve 19, an air outlet valve 20, a first liquid outlet valve 30, and a second liquid outlet valve 31.

[0041] The outlet of the cold tank 28 is connected to the inlet of the circulating pump 26, the outlet of the circulating pump 26 is connected to the inlet of the high-temperature section of the low-temperature side of the first heat exchanger 12, the outlet of the high-temperature section of the low-temperature side of the first heat exchanger 12 is connected to the inlet of the hot tank 27, the outlet of the hot tank 27 is connected to the inlet of the high-temperature side of the second heat exchanger 23, the outlet of the high-temperature side of the second heat exchanger 23 is connected to the inlet of the cold tank 28, forming a heat storage system.

[0042] In this embodiment, the low-temperature molten salt flowing out of the outlet of the cold tank 28 is pressurized by the circulating pump 26 and then enters the first heat exchanger 12 to absorb heat and increase temperature, and the high-temperature molten salt then flows into the hot tank 27.

[0043] The outlet of the compressor 17 is connected to the inlet of the heat storage side of the heat accumulator 18, the outlet of the heat storage side of the heat accumulator 18 is connected to the air inlet pipe 21, the air inlet pipe 21 is connected to the inlet of the gas storage tank 29, the outlet of the gas storage tank 29 is connected to the air outlet pipe 22, the air outlet pipe 22 is connected to the inlet of the heat release side of the heat accumulator 18, and the outlet of the heat release side of the heat accumulator 18 is connected to the inlet of the low-temperature side of the second heat exchanger 23.

[0044] The outlet of the low-temperature side of the second heat exchanger 23 is connected to the inlet of the turbine 24, and the turbine 24 is connected to the second generator 25; the air inlet valve 19 is arranged on the air inlet pipe 21, the air outlet valve 20 is arranged on the air outlet pipe 22, the first liquid outlet valve 30 and the second liquid outlet valve 31 are arranged at the lower part of the gas storage tank 29, forming a compressed air energy storage system.

[0045] The electric energy of the compressor 17 is provided by the disc-shaped solar thermal power generation module. During gas storage, the air inlet valve 19 is opened, the air outlet valve 20 is closed, the liquid outlet valves 30 and 31 are opened, the air is compressed into a high-temperature and high-pressure state by the compressor 17, flows through the heat accumulator 18, becomes a low-temperature and high-pressure state, enters the gas storage tank 29, and the water in the gas storage tank is discharged. After reaching the preset pressure, the compressor 17, the air inlet valve 19, the first liquid outlet valve 30 and the second liquid outlet valve 31 are closed, and the high-pressure gas storage is completed. During gas discharge, the air outlet valve 20 is opened, the first liquid outlet valve 30 and the second liquid outlet valve 31 are opened, seawater flows into the gas storage tank 29, and the compressed air in the gas storage tank 29 flows out under the action of water pressure, sequentially passes through the heat accumulator 18 and the second heat exchanger 23 to absorb heat and increase temperature, and then enters the turbine 24 to expand and do work, driving the second generator 25 to generate electricity.

[0046] The above-mentioned gas storage tank 29 is located on the seabed.

[0047] In one of the preferred embodiments, the offshore platform of the present application is built by a steel frame, so that the height of the offshore platform can be flexibly adjusted to adapt to different ocean depths.

[0048] In one of the preferred embodiments, the gas storage tank of the present application has liquid outlet valves on both sides of the lower part of the tank body, which can adjust the depth of the sea where the gas storage tank is located to adjust the storage and discharge pressure.

[0049] In one of the preferred embodiments, the heat absorber of the present application is provided with a heat absorber shaft, and the heat absorber can freely rotate through the heat absorber shaft to fully absorb heat.

[0050] In one of the preferred embodiments, the disc-shaped parabolic reflector of the present application can freely rotate through the first reflector shaft and the second reflector shaft, and can be adjusted according to the angle of light to fully receive light.

[0051] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0052] It should be noted that when a component is referred to as being "on" another component, it can be directly on the other component or intervening components can also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component, or intervening components can be present. When a component is referred to as being "disposed on" another component, it can be directly disposed on the other component, or intervening components can be present.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] The above description is only the preferred embodiment of the present application, not any form of limitation to the present application; anyone skilled in the art can implement the present application according to the drawings and the above description; however, anyone skilled in the art can make some changes, modifications and equivalent changes to the above-mentioned technical contents without departing from the scope of the technical solutions of the present application; meanwhile, any equivalent changes, modifications and evolution of the above-mentioned embodiments according to the essential technology of the present application are still within the protection scope of the technical solutions of the present application.

Claims

1. An offshore dish solar energy thermal storage system, characterized in that, The application relates to a dish-type solar thermal power generation module and a compressed air energy storage module partially located on the seabed. The dish-type solar thermal power generation module comprises a dish-shaped parabolic reflector (1), a heat absorber (7), a first heat exchanger (12), a Stirling engine (13) and a first generator (16); the dish-shaped parabolic reflector (1) is installed on a sea platform (34) through a support component, incident light (32) is irradiated on the mirror surface of the dish-shaped parabolic reflector (1) to form reflected light (33), a plurality of reflected light (33) converges at a focal point, and the heat absorber (7) is located at the focal point where the reflected light (33) converges; the heat absorber (7) is connected with the first heat exchanger (12) through a support mechanism; the input end of the Stirling engine (13) is connected with the low-temperature side of the first heat exchanger (12), and the output end of the Stirling engine (13) is connected with the first generator (16). The compressed air energy storage module comprises a compressor (17), a heat accumulator (18), a gas storage tank (29) and a second heat exchanger (23); the inlet of the compressor (17) is connected with the atmosphere; the outlet of the compressor (17) is connected with the heat storage side inlet of the heat accumulator (18), the heat release side outlet of the heat accumulator (18) is connected with the low-temperature side inlet of the second heat exchanger (23); and the gas storage tank (29) is connected with the heat accumulator (18). The compressed air energy storage module further comprises a circulating pump (26), a cold tank (28) and a hot tank (27). The outlet of the cold tank (28) is connected with the inlet of the circulating pump (26), the outlet of the circulating pump (26) is connected with the high-temperature section inlet of the low-temperature side of the first heat exchanger (12), the high-temperature section outlet of the low-temperature side of the first heat exchanger (12) is connected with the inlet of the hot tank (27), the outlet of the hot tank (27) is connected with the high-temperature side inlet of the second heat exchanger (23), and the high-temperature side outlet of the second heat exchanger (23) is connected with the inlet of the cold tank (28). The support component comprises a reflector first support (2), a reflector second support (4), a reflector first rotating shaft (3) and a reflector second rotating shaft (5); the dish-shaped parabolic reflector (1) is fixed at one end of the reflector first support (2), the other end of the reflector first support (2) is connected with one end of the reflector second support (4) through the reflector first rotating shaft (3), and the other end of the reflector second support (4) is connected with the reflector second rotating shaft (5); the reflector first support (2) and the reflector second support (4) can rotate through the reflector first rotating shaft (3) and the reflector second rotating shaft (5).

2. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, The support mechanism comprises a heat absorber first support (10) and a heat absorber second support (8); the inlet of the heat absorber (7) is connected with one end of the heat absorber first support (10), the outlet of the heat absorber (7) is connected with one end of the heat absorber second support (8), the other end of the heat absorber second support (8) is connected with the high-temperature side inlet of the first heat exchanger (12), and the other end of the heat absorber first support (10) is connected with the high-temperature side outlet of the first heat exchanger (12).

3. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, ​ 4. A marine dish type solar energy and heat storage system according to claim 3, characterized in that, The heat absorber (7) is provided with a heat absorber rotating shaft (6), which is connected with a heat absorber first support (10) and a heat absorber second support (8) respectively.

5. A marine dish type solar energy and heat storage system according to claim 3, characterized in that, The heat absorber first support (10) is provided with a heat medium inflow channel (11), and the heat absorber second support (8) is provided with a heat medium outflow channel (9); low-temperature heat-conducting oil flowing out of a high-temperature side outlet of the first heat exchanger (12) reaches the heat absorber (7) through the heat medium inflow channel (11) in the heat absorber first support (10), absorbs solar radiation to be heated to high-temperature heat-conducting oil, and reaches a high-temperature side inlet of the first heat exchanger (12) through the heat medium outflow channel (9) in the heat absorber second support (8), so that heat energy is transferred through the first heat exchanger (12).

6. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, The heat storage side outlet of the heat storage device (18) is connected with an inlet of a gas storage tank (29) through an air inlet pipe (21); an outlet of the gas storage tank (29) is connected with a heat release side inlet of the heat storage device (18) through an air outlet pipe (22); the air inlet pipe (21) is provided with an air inlet valve (19), and the air outlet pipe (22) is provided with an air outlet valve (20).

7. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, The lower part of the tank body of the gas storage tank (29) is provided with a first liquid discharge valve (30) and a second liquid discharge valve (31) respectively, and the gas storage tank (29) is located on the seabed.

8. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, The low-temperature side outlet of the second heat exchanger (23) is connected with an inlet of a turbine (24), and the turbine (24) is connected with a second generator (25).

9. A marine dish type solar energy and heat storage system according to claim 1, characterized in that, The working medium of the Stirling engine (13) is helium, and the offshore platform (34) is built through a steel frame.

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