A power generation system based on a friction nanogenerator

Abstract

The application discloses a kind of power generation systems based on friction nanogenerator, including photo-thermal power generation system, heat storage system and friction nanogenerator component.This system is a kind of comprehensive power generation system that TENG wind power generation system is combined with photo-thermal power generation system, the application will large-area TENG power generation system be arranged in solar photo-thermal power station reflector back with array distribution, saves the support part investment of TENG power generation system.Meanwhile, the electric energy of TENG power generation is directly converted into heat energy storage and is stored in the molten salt energy storage system matched with photo-thermal, realizes the energy storage function of wind power generation, and does not need to increase energy storage investment, saves the investment of downstream power transmission and transformation equipment, inverter and other equipment equipped with TENG power generation system, finally, due to the energy storage of TENG power generation system contribution, mirror field area of photo-thermal power generation system can be reduced, and the investment of photo-thermal power station itself will be reduced.

Description

Technical Field

[0001] This invention relates to a power generation system, and more specifically to a power generation system based on a triboelectric nanogenerator. Background Technology

[0002] Against the backdrop of energy scarcity and environmental crisis, improving energy efficiency has become increasingly important. Solar energy is an inexhaustible and clean energy source. Currently, solar photovoltaic (PV) technology is relatively mature and widely applied, but energy storage remains a challenge. While PV power generation systems struggle with energy storage, the most mature PV energy storage solution is still battery storage. However, battery storage remains prohibitively expensive and carries the risk of fires. For large-scale energy storage needs at power plant levels, various types of battery storage are currently difficult to promote. Therefore, solar PV power generation has long faced the problem of curtailment, wasting 15% or even more of its energy. Furthermore, due to the lack of solar energy at night, many solar PV power sources face demand shortages, requiring peak-shaving power plants or other power sources on the grid to meet the demand.

[0003] On the other hand, in areas rich in solar energy resources, wind energy resources can also be utilized, and the unit cost of wind power generation is currently relatively low. However, wind energy also has the characteristics of being discontinuous and unstable, and it inherently requires energy storage. Additionally, wind power often experiences stronger winds at night. However, wind power generation and solar photovoltaic power generation are two different power generation systems with significantly different electrical equipment. Establishing a separate wind power station to solve the day-night peak-shaving problem for solar photovoltaic power generation is not very economically or practically feasible. If a low-wind-speed wind power station could be built near the photovoltaic power station, and some equipment from both power generation systems could be integrated, it would improve economic efficiency. Summary of the Invention

[0004] To overcome the problems of the existing technology, the purpose of this invention is to realize energy storage of solar power generation while maintaining low investment costs. It provides a power generation system based on triboelectric nanogenerator, which combines triboelectric nanogenerator technology with solar thermal power plant. The triboelectric nanogenerator technology is used to convert wind energy into electrical energy, and then the electrical energy is converted into heat energy for storage through an electric heater. This solves the problem of wind energy storage, saves on downstream electrical output equipment of wind power generation, and reduces the mirror field area of ​​solar thermal power plant, thus saving investment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A power generation system based on triboelectric nanogenerators includes a solar thermal power generation system, a thermal storage system, and triboelectric nanogenerator components;

[0007] The solar thermal power generation system includes a mirror field, a receiver, and a power island. The power island is a supercritical CO2 unit, including a CO2 turbine, a CO2 regenerator, a CO2 precooler, and a CO2 compressor. The thermal storage system includes a high-temperature salt tank, a low-temperature salt tank, a molten salt-CO2 heater, and an electric heater.

[0008] The CO2 turbine outlet is connected to the hot-side inlet of the CO2 regenerator, the hot-side outlet of the CO2 regenerator is connected to the CO2-side inlet of the CO2 precooler, the CO2-side outlet of the CO2 precooler is connected to the inlet of the CO2 compressor, the outlet of the CO2 compressor is connected to the cold-side inlet of the CO2 regenerator, the cold-side outlet of the CO2 regenerator is connected to the CO2 inlet of the molten salt-CO2 heater, and the CO2-side outlet of the molten salt-CO2 heater is connected to the inlet of the CO2 turbine.

[0009] The outlet of the low-temperature salt tank is divided into two paths: one path is connected to the inlet of the absorber, and the other path is connected to the molten salt side inlet of the electric heater. The outlet of the absorber and the molten salt side outlet of the electric heater are both connected to the inlet of the high-temperature salt tank. The outlet of the high-temperature salt tank is connected to the molten salt side inlet of the molten salt-CO2 heater, and the molten salt side outlet of the molten salt-CO2 heater is connected to the inlet of the low-temperature salt tank.

[0010] The output end of the triboelectric nanogenerator is connected to the electrical inlet of the electric heater.

[0011] A further improvement of the present invention is that the power island can be replaced with a conventional steam turbine.

[0012] A further improvement of the present invention is that the triboelectric nanogenerator components are distributed and arranged below the mirrors of the mirror field.

[0013] A further improvement of this invention is that the area of ​​the triboelectric nanogenerator is smaller than the area of ​​the mirror in the mirror field.

[0014] A further improvement of the present invention is that the triboelectric nanogenerator is arranged in an array below the reflectors of the mirror field.

[0015] A further improvement of the present invention is that the triboelectric nanogenerator is selected from a slapping triboelectric nanogenerator, a fluttering triboelectric nanogenerator, or a folding triboelectric nanogenerator.

[0016] A further improvement of the present invention is that the electrical energy output by the triboelectric nanogenerator is converted into thermal energy and stored in the molten salt system through an electric heater, and the triboelectric nanogenerator can generate electricity at any time.

[0017] A further improvement of the present invention is that the electric heater and the heat absorber are connected in parallel, and the flow rate of molten salt entering the electric heater and the heat absorber is determined according to the input of wind energy and solar energy at that time.

[0018] A further improvement of the present invention is that the power island of the solar thermal power generation system operates according to the grid demand and outputs electric energy.

[0019] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0020] A power generation system based on a triboelectric nanogenerator provided by the present invention is a comprehensive power generation system that combines a TENG wind power generation system and a solar thermal power generation system. The feature of this invention is that it fully adapts to the limitation of the low energy density of the current TENG power generation system. A large-area TENG power generation system is arranged in an array distribution on the back of the reflector of a solar thermal power plant, saving the investment in the support part of the TENG power generation system. At the same time, the electric energy generated by the TENG is directly converted into heat energy and stored in the molten salt energy storage system supporting the solar thermal power generation, realizing the energy storage function of wind power generation. And because the solar thermal energy storage system is utilized, the investment in the energy storage of wind power generation is also saved. At the same time, since there is no need to equip the TENG power generation system with downstream power transmission and transformation equipment, inverters and other equipment, the investment in this part of the electrical system is saved. Finally, due to the increase in the energy storage contributed by the TENG power generation system, the mirror field area of the solar thermal power generation system can be reduced, and the investment in the solar thermal power plant itself will also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the power generation system based on a triboelectric nanogenerator of the present invention;

[0022] Figure 2 is a schematic diagram of the arrangement of the reflector and the TENG components; where Figure 2 (a) is a view in the 45-degree direction, Figure 2 (b) is a side view;

[0023] Figure 3 is a schematic structural diagram of the TENG components;

[0024] Figure 4 is a schematic diagram of the principle of the flapping TENG components, where Figure 4 (a) is the compressed state, Figure 4 (b) is the released state, i represents current, indicating that current flows during the discharge process, and the arrow indicates the current direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present invention in detail with reference to the drawings:

[0026] As Figure 1 shown, a power generation system based on a triboelectric nanogenerator provided by the present invention includes: a solar thermal power generation system 1, an energy storage system 2, and a triboelectric nanogenerator component 3.

[0027] The concentrated solar power (CSP) system 1 includes: a mirror field 1.1, a receiver 1.2, and a power island 1.3. The power island 1.3 can take any form, such as a conventional steam turbine or a new type of supercritical CO2 turbine. Taking a simple cycle supercritical CO2 turbine as an example, it includes: a CO2 turbine 1.3.1, a CO2 regenerator 1.3.2, a CO2 precooler 1.3.3, and a CO2 compressor 1.3.4. The outlet of the CO2 turbine 1.3.1 is connected to the hot-side inlet of the CO2 regenerator 1.3.2. The CO2 regenerator 1.3... The hot side outlet of CO2 1.3.3 is connected to the CO2 side inlet of CO2 precooler 1.3.3. The CO2 side outlet of CO2 precooler 1.3.3 is connected to the inlet of CO2 compressor 1.3.4. The outlet of CO2 compressor 1.3.4 is connected to the cold side inlet of CO2 regenerator 1.3.2. The cold side outlet of CO2 regenerator 1.3.2 is connected to the CO2 inlet of molten salt-CO2 heater 2.3. The CO2 side outlet of molten salt-CO2 heater 2.3 is connected to the inlet of CO2 turbine 1.3.1.

[0028] The thermal storage system 2 includes a high-temperature salt tank 2.1, a low-temperature salt tank 2.2, a molten salt-CO2 heater 2.3, and an electric heater 2.4. The outlet of the low-temperature salt tank 2.2 is divided into two paths: one path is connected to the inlet of the absorber 1.2, and the outlet of the absorber 1.2 is connected to the inlet of the high-temperature salt tank 2.1; the other path is connected to the molten salt side inlet of the electric heater 2.4. The molten salt side outlet of the electric heater 2.4 is also connected to the inlet of the high-temperature salt tank 2.1. The outlet of the high-temperature salt tank 2.1 is connected to the molten salt side inlet of the molten salt-CO2 heater 2.3, and the molten salt side outlet of the molten salt-CO2 heater 2.3 is connected to the inlet of the low-temperature salt tank 2.2.

[0029] The output end of the triboelectric nanogenerator 3 is connected to the electrical inlet of the electric heater 2.4.

[0030] The triboelectric nanogenerator 3 is distributed below the reflector. Since the reflectors in the mirror field are distributed around the solar collector tower with varying angles and orientations, and need to rotate with the light, the mounting rod 3.1 of the triboelectric nanogenerator 3 is fixed below the reflector. The main body of the power generation component of the triboelectric nanogenerator can rotate around the mounting rod 3.1 with changes in wind direction, thus adapting to the arrangement characteristics of the reflectors in the solar thermal system. The area of ​​the triboelectric nanogenerator 3 is relatively small compared to the area of ​​the reflector; for example, the reflector area can reach 100 m². 2 The area of ​​the triboelectric nanogenerator 3 is about 200mm*200mm, and the triboelectric nanogenerator can be distributed in an array under the reflector.

[0031] The triboelectric nanogenerator 7 can be selected from types such as tapping triboelectric nanogenerator, fluttering triboelectric nanogenerator, and folding triboelectric nanogenerator.

[0032] The electrical energy output by the triboelectric nanogenerator 3 of this system is converted into thermal energy and stored in the molten salt system via an electric heater 2.4. The triboelectric nanogenerator 3 can generate electricity at any time without restriction. The electric heater 2.4 is connected in parallel with the absorber 1.2, and the flow rate of molten salt entering the two devices is determined according to the current input of wind and solar energy. The power island 1.3 of the solar thermal power generation system operates according to the grid demand and outputs electrical energy.

[0033] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power generation system based on a triboelectric nanogenerator, characterized in that, It includes a solar thermal power generation system (1), a thermal storage system (2), and a triboelectric nano-power generation component (3); The solar thermal power generation system (1) includes a mirror field (1.1), a receiver (1.2), and a power island (1.3). The power island (1.3) is a supercritical CO2 unit, including a CO2 turbine (1.3.1), a CO2 regenerator (1.3.2), a CO2 precooler (1.3.3), and a CO2 compressor (1.3.4). The thermal energy storage system (2) includes a high-temperature salt tank (2.1), a low-temperature salt tank (2.2), a molten salt-CO2 heater (2.3), and an electric heater (2.4). The outlet of the CO2 turbine (1.3.1) is connected to the hot-side inlet of the CO2 regenerator (1.3.2), the hot-side outlet of the CO2 regenerator (1.3.2) is connected to the CO2-side inlet of the CO2 precooler (1.3.3), the CO2-side outlet of the CO2 precooler (1.3.3) is connected to the inlet of the CO2 compressor (1.3.4), the outlet of the CO2 compressor (1.3.4) is connected to the cold-side inlet of the CO2 regenerator (1.3.2), the cold-side outlet of the CO2 regenerator (1.3.2) is connected to the CO2 inlet of the molten salt-CO2 heater (2.3), and the CO2-side outlet of the molten salt-CO2 heater (2.3) is connected to the inlet of the CO2 turbine (1.3.1). The outlet of the low-temperature salt tank (2.2) is divided into two paths. One path is connected to the inlet of the absorber (1.2), and the other path is connected to the molten salt side inlet of the electric heater (2.4). The outlet of the absorber (1.2) and the molten salt side outlet of the electric heater (2.4) are both connected to the inlet of the high-temperature salt tank (2.1). The outlet of the high-temperature salt tank (2.1) is connected to the molten salt side inlet of the molten salt-CO2 heater (2.3), and the molten salt side outlet of the molten salt-CO2 heater (2.3) is connected to the inlet of the low-temperature salt tank (2.2). The output end of the triboelectric nanogenerator (3) is connected to the electrical inlet of the electric heater (2.4); The electrical energy output by the triboelectric nano-power generation component (3) is converted into thermal energy and stored in the molten salt system through an electric heater (2.4), and the triboelectric nano-power generation component (3) can generate electricity at any time; The electric heater (2.4) is connected in parallel with the absorber (1.2), and the flow rate of molten salt entering the electric heater (2.4) and the absorber (1.2) is determined according to the amount of wind and solar energy input at that time.

2. The power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The power island (1.3) was replaced with a steam turbine unit.

3. The power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The triboelectric nanogenerator (3) is arranged below the mirror of the mirror field (1.1).

4. The power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The area of ​​the triboelectric nanogenerator (3) is smaller than the area of ​​the mirror in the mirror field (1.1).

5. A power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The triboelectric nanogenerator is arranged in an array below the mirrors in the mirror field (1.1).

6. A power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The triboelectric nanogenerator (3) is selected from the tapping type triboelectric nanogenerator, the flutter type triboelectric nanogenerator, or the folding type triboelectric nanogenerator.

7. A power generation system based on a triboelectric nanogenerator according to claim 1, characterized in that, The power island (1.3) of the solar thermal power generation system (1) operates according to the grid demand and outputs electrical energy.

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