阅读说明：本技术 一种光伏光热热力互补的供储能系统 (Photovoltaic photo-thermal and thermal complementary energy supply and storage system ) 是由 王远 王慧青 张南 孟勇 赵永坚 王国忠 徐远纲 赵杰 于 2021-08-12 设计创作，主要内容包括：本发明公开了一种光伏光热热力互补的供储能系统,包括分光器件,二次匀光器件,光伏发电系统,塔式太阳能聚光系统,储能罐,燃气轮机发电系统；其中,所述太阳光线进入分光器件用于对太阳光谱的短波和长波进行部分分光,将短波用于光伏发电系统发电,长波用于塔式太阳能聚光系统生产高参数的导热流体,太阳光充足时将多余导热流体存储在储能罐中,其余的导热流体进入空气加热器加热燃气轮机发电系统燃烧室的入口空气,用于增加布雷顿循环压缩空气初焓的方式进行太阳能间接发电。本发明同时利用光热发电的储能优势,增加导热流体储能罐,提高系统的发电稳定性。(The invention discloses a photovoltaic photo-thermal thermodynamic complementary energy supply and storage system, which comprises a light splitting device, a secondary light homogenizing device, a photovoltaic power generation system, a tower type solar light condensation system, an energy storage tank and a gas turbine power generation system, wherein the light splitting device is connected with the secondary light homogenizing device; the solar light enters the light splitting device and is used for partially splitting short waves and long waves of a solar spectrum, the short waves are used for power generation of the photovoltaic power generation system, the long waves are used for producing high-parameter heat-conducting fluid by the tower-type solar concentrating system, redundant heat-conducting fluid is stored in the energy storage tank when sunlight is sufficient, and the rest heat-conducting fluid enters the air heater to heat inlet air of a combustion chamber of the gas turbine power generation system and is used for carrying out solar indirect power generation in a mode of increasing the initial enthalpy of Brayton cycle compressed air. The invention simultaneously utilizes the energy storage advantage of photo-thermal power generation, adds the heat-conducting fluid energy storage tank and improves the power generation stability of the system.)

1. The photovoltaic photo-thermal thermodynamic complementary energy supply and storage system is characterized by comprising a light splitting device (1), a secondary light homogenizing device (2), a photovoltaic power generation system (3), a tower type solar light gathering system (4), an energy storage tank (5) and a gas turbine power generation system (9); wherein the content of the first and second substances,

the sunlight enters the light splitting device (1) and is used for partially splitting short waves and long waves of a solar spectrum, the short waves are used for generating power by the photovoltaic power generation system (3), the long waves are used for producing high-parameter heat-conducting fluid by the tower-type solar light condensation system (4), when the sunlight is sufficient, redundant heat-conducting fluid is stored in the energy storage tank (5), and the rest heat-conducting fluid enters the air heater (8) to heat inlet air of a combustion chamber of the gas turbine power generation system (9) and is used for indirectly generating power by solar energy in a mode of increasing the initial enthalpy of Brayton cycle compressed air.

2. The photovoltaic photo-thermal thermodynamic complementary energy supply and storage system according to claim 1, wherein the short wave wavelength for the photovoltaic power generation system is less than 850nm to 900nm, and the rest is used for the tower type solar concentration system.

3. The photovoltaic photo-thermal and thermal-complementary energy supply and storage system as claimed in claim 1, wherein the light in the secondary dodging device (2) is reflected and refracted for multiple times to form a uniform focusing light spot.

4. The photovoltaic photo-thermal and thermal-power complementary energy supply and storage system according to claim 1, wherein the tower-type solar energy concentrating system (4) comprises a heat absorber (10), and the heat absorber (10) is made of porous foamed ceramics and is made of materials such as silicon carbide or zirconium oxide.

5. The photovoltaic photothermal thermal complementary energy supply and storage system according to claim 1, wherein a heat conducting fluid pipeline (12) is arranged at the outlet of the air heater (8), the heat conducting fluid pipeline (12) is connected with the tower type solar concentrating system (4), and the heat conducting fluid is reheated in the heat absorber (10);

an air pipeline (13) is arranged at the outlet of the air heater (8), and the air pipeline (13) is connected with a combustion chamber of the gas turbine power generation system (9).

6. The photovoltaic photo-thermal thermodynamic complementary energy supply and storage system according to claim 1, wherein an air pipe (7) is arranged at the inlet of the air heater (8), and the air pipe (7) is connected with the compressor outlet of the gas turbine power generation system (9);

an inlet of the energy storage tank (5) is connected with a heat-conducting fluid outlet pipeline (11), and an outlet of the energy storage tank (5) is connected with an air heater (8).

7. The photovoltaic photothermal thermal complementary energy supply and storage system according to claim 1, wherein the temperature of the heat transfer fluid at the inlet of the air heater (8) is 600 ℃ to 700 ℃.

8. A photovoltaic photothermal thermodynamic complementary energy supply and storage system according to claim 1, wherein the air heater (8) is a finned heat exchanger.

9. A photovoltaic photo-thermal thermodynamic complementary energy supply and storage system according to claim 1, wherein the photovoltaic power generation system (3) comprises photovoltaic modules having a surface temperature below 60 ℃.

Technical Field

The invention belongs to the technical field of solar heat utilization, and particularly relates to a photovoltaic photo-thermal thermodynamic complementary energy supply and storage system.

Background

Currently, there are two main solar power generation methods, including photovoltaic power generation and photo-thermal power generation. Since photovoltaic power generation can utilize only a specific wavelength photovoltaic range, the power generation efficiency thereof is concentrated in a range of 12% to 25%. Although the photo-thermal power generation utilizes the full spectrum of solar energy, the high-grade ultraviolet and visible band energy is converted into low-grade solar heat energy, and serious irreversible loss exists in the conversion process, so that the photo-thermal power generation efficiency is more in the range of 13-20%, and is still lower. Therefore, the full spectrum cascade utilization method is regarded and researched as an important forward research direction in the field of solar energy utilization.

The solar photo-thermal power generation system generally comprises a heat collection system, a heat transmission and storage system, a heat exchange system and a power generation system. When the solar energy generating device operates, sunlight is focused on the heat absorber through the condenser field, the heat absorber heats working media to high temperature, high-temperature and high-pressure steam or supercritical carbon dioxide is generated through heat exchange, and finally equipment such as a steam turbine and the like is driven to generate electricity. Solar photovoltaic power generation is to convert solar energy directly into electric energy by utilizing a photovoltaic effect principle, usually, incident solar energy is condensed on the surface of a cell, and the amount of required cell materials is reduced under the same output electric power, so that the photovoltaic power generation cost is reduced.

The photovoltaic-photothermal complementary utilization system is used for partially splitting short waves and long waves of a solar spectrum, respectively used for photovoltaic power generation and photothermal utilization, and simultaneously enabling the solar spectrum and the long waves to operate in respective suitable temperature ranges, so that the full solar spectrum is divided, and the high-frequency part and the low-frequency part are respectively subjected to photovoltaic utilization and photothermal utilization. Due to the use of the light splitting device, the energy flow distribution on the surface of the photovoltaic cell is not uniform, and further the problems of concentrated surface temperature, mismatched internal current and the like of the cell are caused.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a photovoltaic photo-thermal complementary energy supply and storage system, which can realize more efficient and more stable power generation by forming thermal complementation through solar energy and thermal circulation. The invention converts solar energy into high-temperature heat energy by using a high-power tower type light-gathering heat-collecting mode, is used for heating inlet air of a combustion chamber of a gas turbine, realizes solar power generation by increasing the initial enthalpy of Brayton cycle compressed air, and simultaneously increases a heat-conducting fluid energy storage tank by using the energy storage advantage of photo-thermal power generation, thereby improving the power generation stability of the system.

In order to achieve the purpose, the invention adopts the technical scheme that:

a photovoltaic photo-thermal complementary energy supply and storage system comprises a light splitting device 1, a secondary light homogenizing device 2, a photovoltaic power generation system 3, a tower type solar light condensation system 4, an energy storage tank 5 and a gas turbine power generation system 9; wherein the content of the first and second substances,

the sunlight enters the light splitting device 1 and is used for partially splitting short waves and long waves of a solar spectrum, the short waves are used for generating power by the photovoltaic power generation system 3, the long waves are used for producing high-parameter heat-conducting fluid by the tower-type solar concentrating system 4, when sunlight is sufficient, redundant heat-conducting fluid is stored in the energy storage tank 5, and the rest heat-conducting fluid enters the air heater 8 to heat inlet air of a combustion chamber of the gas turbine power generation system 9 and is used for increasing the initial enthalpy of Brayton cycle compressed air to carry out solar indirect power generation.

The short wave wavelength used for the photovoltaic power generation system is less than 850 nm-900 nm, and the rest part is used for the tower type solar energy condensation system.

And the light in the secondary light homogenizing device 2 is reflected and refracted for multiple times to form uniform focusing light spots.

The tower-type solar concentrating system 4 comprises a heat absorber 10, wherein the heat absorber 10 is made of porous foamed ceramics and is made of materials such as silicon carbide or zirconium oxide.

And a heat-conducting fluid pipeline 12 is arranged at the outlet of the air heater 8, the heat-conducting fluid pipeline 12 is connected with the tower type solar concentrating system 4, and the heat-conducting fluid is heated again in the heat absorber 10.

An air pipeline 13 is arranged at the outlet of the air heater 8, and the air pipeline 13 is connected with a combustion chamber of the gas turbine power generation system 9.

An inlet of the air heater 8 is provided with an air pipeline 7, and the air pipeline 7 is connected with a compressor outlet of a gas turbine power generation system 9.

An inlet of the energy storage tank 5 is connected with a heat-conducting fluid outlet pipeline 11, and an outlet of the energy storage tank 5 is connected with an air heater 8.

The temperature of the heat-conducting fluid at the inlet of the air heater 8 is 600-700 ℃.

The air heater 8 is a finned heat exchanger, and the heat exchange efficiency is higher than 96%.

The photovoltaic power generation system 3 comprises a photovoltaic module, and the surface temperature of the photovoltaic module is lower than 60 ℃.

And the system performs optimal selection on the power of the compressor of the gas turbine according to the economic evaluation result.

The invention has the beneficial effects that:

compared with a conventional solar power generation system, the solar photovoltaic, photo-thermal and thermal cycle power generation system is combined, the stability of system power generation is guaranteed while solar energy is efficiently utilized, meanwhile, the power supply quality of the system is improved by combining an energy storage system, the resource waste caused by a light abandoning phenomenon is reduced, and the efficient utilization of clean energy is realized.

According to the invention, the secondary light homogenizing device is added on the surface of the photovoltaic cell, so that the light-homogenizing focal spots are formed by multiple reflection and refraction before the light-condensing rays are focused on the surface of the photovoltaic cell, and the energy flow distribution on the surface of the photovoltaic cell is more uniform.

Compared with the prior art, the solar energy can be more effectively utilized, the photo-thermal conversion loss of the system is reduced, and the clean energy power supply with higher efficiency can be realized. Meanwhile, an energy storage system combining a thermodynamic system and photo-thermal power generation is combined, so that the system can stably supply power for a long time, and the problem that the existing clean energy is unstable in power supply is solved.

Drawings

Fig. 1 shows a photovoltaic photo-thermal complementary energy supply and storage system according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, a photovoltaic photo-thermal thermodynamic complementary energy supply and storage system is characterized by comprising a light splitting device 1, a secondary light homogenizing device 2, a photovoltaic power generation system 3, a tower type solar light gathering system 4, an energy storage tank 5 and a gas turbine power generation system 9; wherein the content of the first and second substances,

the solar rays enter the light splitting device 1, partial light splitting is carried out on short waves and long waves of a solar spectrum, the short waves are used for power generation of the photovoltaic power generation system 3, and the long waves are used for producing high-parameter heat-conducting fluid by the tower type solar light condensation system 4. The short wave wavelength used for the photovoltaic power generation system is less than 850 nm-900 nm, and the rest part is used for the tower type solar energy condensation system. In the photovoltaic power generation system 3, the surface temperature of a photovoltaic module is lower than 60 ℃; the heat absorber 4 in the tower-type solar concentrating system 4 is made of porous foamed ceramics, and the material is silicon carbide or zirconia and other materials.

Because the use of the light splitting device generally causes uneven energy flow distribution on the surface of the photovoltaic cell, thereby causing the problems of concentrated temperature on the surface of the cell, unmatched internal current and the like, the invention adds the secondary light homogenizing device 2 on the surface of the photovoltaic cell, so that the light-concentrating rays form a light-homogenizing focal spot through multiple reflection and refraction before being focused on the surface of the photovoltaic cell, and the energy flow distribution on the surface of the photovoltaic cell is more uniform.

The heat-conducting fluid outlet pipeline 11 is connected with the energy storage tank 5, when sunlight is sufficient, redundant heat-conducting fluid is stored in the energy storage tank 5, the outlet of the energy storage tank 5 is connected with the air heater 8, and the rest heat-conducting fluid enters the air heater 8 to heat inlet air of a combustion chamber of the gas turbine power generation system 9 so as to increase the initial enthalpy of Brayton cycle compressed air to carry out solar indirect power generation. The air heater 8 is a finned heat exchanger, the heat exchange efficiency is higher than 96%, a heat conduction fluid pipeline 12 at the outlet of the air heater is connected with the tower type solar light concentrating system 4, and the heat conduction fluid is heated again in the heat absorber 10. Wherein the temperature of the heat-conducting fluid at the inlet of the air heater 8 is 600-700 ℃.

Wherein, an air pipeline 13 at the outlet of the air heater is connected with a combustion chamber of a gas turbine power generation system 9, an air pipeline 7 at the inlet of the air heater is connected with the outlet of a compressor of the gas turbine power generation system 9, and the optimized selection of the compressor power of the gas turbine is carried out according to the economic evaluation result.

The invention realizes the gradient utilization of the photovoltaic and the photo-thermal on the solar full spectrum by light splitting of the light splitting device and the utilization of the secondary light homogenizing device to ensure the uniformity of the light after light splitting, thereby realizing the low-cost and high-efficiency utilization of the solar energy. Meanwhile, the stable power supply of the whole system is ensured by combining the thermodynamic system and an energy storage system in the photo-thermal system, and the concentrating solar energy and the Brayton cycle heat are complementarily integrated, so that a larger solar power generation share is obtained, and meanwhile, the higher solar heat power generation efficiency is ensured.