Light condensing and splitting system

Abstract

The invention provides a light condensing and splitting system, and relates to the technical field of solar energy. The light condensation and splitting system comprises a heliostat, photovoltaic equipment and an absorption tower, and the absorption tower comprises a centralized photochemical material and is used for absorbing light of a specific wave band; the heliostat comprises a reflecting surface, the reflecting surface faces the absorption tower, the reflecting surface comprises a light coating, and the light coating reflects the light of the specific wave band and transmits the light beyond the specific wave band; the photovoltaic equipment is arranged corresponding to the heliostat, is positioned on one side, far away from the absorption tower, of the heliostat and comprises a photovoltaic panel, and the photovoltaic panel is at least used for absorbing light beyond the specific wave band. The embodiment of the invention provides a light condensing and splitting system to improve the utilization efficiency of sunlight.

Description

Technical Field

[0001] The invention relates to the field of solar energy technology, and in particular to a light collecting and splitting system. Background Art

[0002] In the field of energy, solar energy is increasingly used as a clean renewable energy source. In the field of solar power generation, there are two types of solar power generation: photovoltaic power generation and thermal power generation. With the development of science and technology, especially the rise of computer control technology, solar thermal power generation technology is an emerging solar energy utilization technology after photovoltaic power generation technology. Solar thermal power generation is to use a large number of reflectors to focus the energy of direct sunlight, heat the working fluid, generate high-temperature and high-pressure steam, and use steam to drive steam turbines to generate electricity.

[0003] Tower solar thermal power generation uses a large number of directional reflectors (heliostats) to focus sunlight onto a central heat exchanger (absorber) mounted on the top of the tower, and generates electricity by heating the fluid inside to drive the turbine to rotate. However, the utilization efficiency of sunlight in related technologies is low. Summary of the invention

[0004] The embodiment of the present invention provides a light concentrating and light splitting system to improve the utilization efficiency of sunlight.

[0005] An embodiment of the present invention provides a light concentrating and splitting system, comprising a heliostat, a photovoltaic device and an absorption tower, wherein the absorption tower comprises a concentrated photochemical material for absorbing light of a specific wavelength band;

[0006] The heliostat comprises a reflective surface, the reflective surface faces the absorption tower, the reflective surface comprises a light coating, the light coating reflects light in the specific wavelength band and transmits light outside the specific wavelength band;

[0007] The photovoltaic device corresponding to the heliostat is located at a side of the heliostat away from the absorption tower. The photovoltaic device includes a photovoltaic panel, which is used to absorb light outside the specific wavelength band.

[0008] Optionally, the specific wavelength band is within the range of 200nm to 800nm.

[0009] Optionally, the plurality of heliostats include a first heliostat and a second heliostat, and a distance between the first heliostat and the absorption tower is smaller than a distance between the second heliostat and the absorption tower;

[0010] The height of the reflecting surface of the first heliostat from the ground plane is less than the height of the reflecting surface of the second heliostat from the ground plane.

[0011] Optionally, a plurality of the first heliostats surround the absorption tower to form a first heliostat array ring; and a plurality of the second heliostats surround the first heliostat array ring to form a second heliostat array ring.

[0012] Optionally, a plurality of the photovoltaic devices surround the first heliostat array ring to form a photovoltaic device array ring, and the second heliostat array ring surrounds the photovoltaic device array ring.

[0013] Optionally, the first heliostat array ring is circular or arc-shaped, the second heliostat array ring is circular or arc-shaped, and the photovoltaic device array ring is circular or arc-shaped.

[0014] Optionally, it further comprises a mounting base, wherein the mounting base comprises a plurality of mounting surfaces arranged in a stepped manner; the plurality of mounting surfaces comprises a first mounting surface and a second mounting surface, and a height of the first mounting surface from the ground plane is less than a height of the second mounting surface from the ground plane;

[0015] The first heliostat is installed on the first installation surface, and the second heliostat is installed on the second installation surface.

[0016] Optionally, the photovoltaic device arranged corresponding to the first heliostat is installed on the first installation surface.

[0017] Optionally, it further comprises a mounting base, wherein the mounting base comprises a mounting inclined surface;

[0018] The first heliostat and the second heliostat are installed on the installation slope.

[0019] Optionally, it also includes concentrated light catalytic hydrogen production equipment and / or concentrated light quantum power generation equipment;

[0020] The concentrated light catalytic hydrogen production equipment and the concentrated light quantum power generation equipment are connected to the absorption tower.

[0021] Since different photochemical materials require different wavelengths of sunlight to react, the concentrated photochemical materials of the absorption tower and the photovoltaic panel optical materials of the photovoltaic panel require different wavelengths of sunlight to react. In the focusing and splitting system provided by the embodiment of the present invention, the reflective surface distributes sunlight of different wavelengths, so that different photochemical materials can undergo their own chemical reactions at the same time in the same place and under the same light source, thereby improving the utilization rate of sunlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a light focusing and light splitting system provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of another light focusing and light splitting system provided by an embodiment of the present invention;

[0024] Figure 3 A side view of another light focusing and light splitting system provided by an embodiment of the present invention;

[0025] Figure 4 for Figure 3 A top view of the light focusing and splitting system shown;

[0026] Figure 5 A schematic diagram of another light focusing and light splitting system provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of another light focusing and light splitting system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] Figure 1 A schematic diagram of a light focusing and light splitting system provided by an embodiment of the present invention, referring to Figure 1 , the concentrating and splitting system includes a heliostat 21, a photovoltaic device 31 and an absorption tower 11. The absorption tower 11 includes a centralized photochemical material, which is used to absorb light in a specific wavelength band. Therefore, the absorption tower 11 can use the absorbed light in a specific wavelength band to achieve the purpose of converting light into electricity or photolysis of water to produce hydrogen. The heliostat 21 includes a reflecting surface 22, and the reflecting surface 22 faces the absorption tower 11. The reflecting surface 22 includes a light coating, which reflects light in a specific wavelength band and transmits light outside the specific wavelength band. As a result, the sunlight projected onto the heliostat 21, the light in a specific wavelength band in the sunlight is reflected by the reflecting surface 22 toward the absorption tower 11, and is absorbed by the centralized photochemical material in the absorption tower 11. It should be noted that the absorption here refers to the conversion of light into other energy, thereby realizing the utilization of light energy.

[0030] The photovoltaic device 31 corresponding to the heliostat 21 is located on the side of the heliostat 21 away from the absorption tower 11. In the photovoltaic device 31 and the heliostat 21 correspondingly arranged, the heliostat 21 is located between the absorption tower 11 and the photovoltaic device 31. The photovoltaic device 31 includes a photovoltaic panel 32, and the photovoltaic panel 32 is at least used to absorb light outside a specific band. The photovoltaic device 31 is arranged at the side and rear of the heliostat 21. The photovoltaic device 31 can not only utilize the directly irradiated sunlight, but also utilize the light transmitted by the reflective surface 22 of the heliostat 21 to absorb the light outside the specific band in the light transmitted by the reflective surface 22 of the heliostat 21.

[0031] Since different photochemical materials require different wavelengths of sunlight to react, the concentrated photochemical materials of the absorption tower 11 and the photovoltaic panel optical materials of the photovoltaic panel 32 require different wavelengths of sunlight to react. In the light-collecting and light-splitting system provided by the embodiment of the present invention, the reflective surface 22 distributes sunlight of different wavelengths, so that different photochemical materials can undergo their own chemical reactions at the same time in the same place and under the same light source, thereby improving the utilization rate of sunlight.

[0032] Exemplarily, the photovoltaic device 31 is placed below the corresponding heliostat 21 and in an open space to collect the transmitted light of the heliostat 21 and direct sunlight to achieve photovoltaic power generation.

[0033] Optionally, the specific wavelength band is within the range of 200 nm to 800 nm.

[0034] In one example, the specific wavelength band is 200nm to 400nm. The reflective surface 22 of the heliostat 21 reflects the light of 200nm to 400nm in the sunlight to the absorption tower 11, which is absorbed and utilized by the centralized photochemical material in the absorption tower 11. The light outside the range of 200nm to 400nm in the sunlight will pass through the reflective surface 22 of the heliostat 21 and be projected onto the photovoltaic device 31 behind the side of the heliostat 21. The light of 400nm to 1200nm in the transmitted light will be absorbed and utilized by the photovoltaic panel optical material of the photovoltaic panel 32 in the photovoltaic device 31. It should be noted that in other embodiments, the specific wavelength band can also be other wavelength ranges.

[0035] Figure 2 A schematic diagram of another light focusing and light splitting system provided in an embodiment of the present invention, referring to Figure 1 and Figure 2 The plurality of heliostats 21 include a first heliostat 211 and a second heliostat 212. The distance between the first heliostat 211 and the absorption tower 11 is smaller than the distance between the second heliostat 212 and the absorption tower 11. The reflection surface 22 of the first heliostat 211 is 1.30 meters above the ground (eg, Figure 2The height of the heliostat 21 (shown by the dotted line in the figure) is less than the height of the reflecting surface 22 of the second heliostat 212 from the ground plane. It is understandable that the heliostats 21 located in the front row will block the heliostats 21 located in the back row, resulting in part of the sunlight being unable to be projected to the heliostats 21 located in the back row. In order to prevent the heliostats 21 located in the back row from being blocked, in the related art, the spacing between two adjacent heliostats 21 is set to be relatively large. This results in the area occupied by the focusing and spectroscopic system being too large. On the other hand, the reflection distance of light in some bands is very limited and cannot be reflected over long distances. For example, ultraviolet rays cannot be focused over a distance of more than 100 meters. The farther the distance, the more light energy is lost through scattering and the like. In the related art, the "butterfly mirror" cannot focus light over a large area. In the embodiment of the present invention, a low-front-high-back arrangement is adopted, and the height of the reflective surface 22 of the first heliostat 211 that is closer is less than the height of the reflective surface 22 of the second heliostat 212 that is farther away, thereby utilizing the space in the vertical direction to reduce the distance between the first heliostat 211 and the second heliostat 212 in the horizontal direction. The "theater-style" mirror field layout adopted in the embodiment of the present invention can, on the one hand, reduce the floor space of the focusing and splitting system, realize the layout of the maximum reflector area under the condition of limited distance, and maximize the use of sunlight energy; on the other hand, it solves the problem of the limited reflection distance of photochemical materials for light of a specific wavelength, gathers enough light, improves the utilization rate of sunlight, and realizes high-powered focusing and high energy in a short distance and small area.

[0036] Figure 3 A side view of another light focusing and light splitting system provided by an embodiment of the present invention, Figure 4 for Figure 3 The top view of the focusing and splitting system shown in FIG. Figure 3 and Figure 4 The photovoltaic device 31 is omitted. Figure 3 and Figure 4 A plurality of first heliostats 211 surround the absorption tower 11 to form a first heliostat array ring. Figure 4 The circle is only for illustrating the position of the heliostat array ring, is an auxiliary line, and has no corresponding physical element. A plurality of second heliostats 212 surround the absorption tower 11 to form a second heliostat array ring. The second heliostat array ring is located at the periphery of the first heliostat array ring and is arranged around the first heliostat array ring. That is, a plurality of second heliostats 212 surround the first heliostat array ring to form a second heliostat array ring.

[0037] Figure 5 A schematic diagram of another light focusing and light splitting system provided in an embodiment of the present invention, with reference to Figure 3-Figure 5, multiple photovoltaic devices 31 surround the first heliostat array ring to form a photovoltaic device array ring, and the second heliostat array ring surrounds the photovoltaic device array ring. It should be noted that the focusing and splitting system may include one or more photovoltaic device array rings. For example, a photovoltaic device array ring is correspondingly arranged at the periphery of the second heliostat array ring. The embodiment of the present invention does not limit the number of heliostat array rings. It can be 2 or more than 2 heliostat array rings.

[0038] Optionally, refer to Figure 3-Figure 5 , the first heliostat array ring is circular or arc-shaped, the second heliostat array ring is circular or arc-shaped, and the photovoltaic device array ring is circular or arc-shaped. In other embodiments, at least one of the first heliostat array ring, the second heliostat array ring, and the photovoltaic device array ring may also be elliptical, square, rectangular, or the like.

[0039] Optionally, refer to Figure 3-Figure 5 The light focusing and splitting system further comprises a mounting base 40, and the mounting base 40 comprises a plurality of mounting surfaces arranged in a stepped manner. The plurality of mounting surfaces comprises a first mounting surface 41 and a second mounting surface 42, and the first mounting surface 41 is at a distance of ( Figure 3 The height of the second mounting surface 42 is less than the height of the second mounting surface 42 from the ground plane. The first heliostat 211 is mounted on the first mounting surface 41, and the second heliostat 212 is mounted on the second mounting surface 42. The multiple mounting surfaces arranged in steps provide mounting bases of different heights for the heliostats 21.

[0040] Optionally, refer to Figure 1-Figure 5 The photovoltaic device 31 corresponding to the first heliostat 211 is installed on the first mounting surface 41. The heliostat 21 installed on the same mounting surface is corresponding to the photovoltaic device 31, and the photovoltaic device 31 can use the transmitted light of the heliostat 21 corresponding to it.

[0041] Figure 6 A schematic diagram of another light focusing and light splitting system provided in an embodiment of the present invention, referring to Figure 6 The light concentrating and splitting system further comprises a mounting base 40, and the mounting base 40 comprises a mounting slope 50. The first heliostat 211 and the second heliostat 212 are mounted on the mounting slope 50. The mounting slope 50 provides mounting bases of different heights for the heliostats 21.

[0042] Exemplarily, the cross section of the mounting base 40 is in a triangular shape, which is stable and can provide a stable mounting base for the heliostat 21. In other embodiments, the cross section of the mounting base 40 may also have other shapes.

[0043] In other embodiments, the heliostat 21 further includes a first bracket, and the first bracket is used to support the reflective surface 22. Figure 2 As shown, first brackets of different heights may also be provided for different heliostats 21. The height of the first bracket of the second heliostat 212 is greater than the height of the first bracket of the first heliostat 211.

[0044] Optionally, refer to Figure 5 The light-concentrating and light-splitting system further includes a light-concentrating catalytic hydrogen production device 61 and / or a light-concentrating quantum power generation device 62. The light-concentrating catalytic hydrogen production device 61 is connected to the absorption tower 11. The light-concentrating catalytic hydrogen production device 61 produces hydrogen by photolysis of water through the absorption tower 11 absorbing sunlight. The light-concentrating quantum power generation device 62 is connected to the absorption tower 11. The light-concentrating quantum power generation device 62 converts light into electricity through the absorption tower 11 absorbing sunlight.

[0045] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A light focusing and light splitting system, characterized in that: It includes a heliostat, a photovoltaic device and an absorption tower, wherein the absorption tower includes a concentrated photochemical material for absorbing light in a specific wavelength band; The heliostat comprises a reflective surface, the reflective surface faces the absorption tower, the reflective surface comprises a light coating, the light coating reflects light in the specific wavelength band and transmits light outside the specific wavelength band; The photovoltaic device corresponding to the heliostat is located at a side of the heliostat away from the absorption tower. The photovoltaic device includes a photovoltaic panel, which is used to absorb light outside the specific wavelength band.

2. The light focusing and splitting system according to claim 1, characterized in that: The specific wavelength band is within the range of 200nm to 800nm.

3. The light focusing and splitting system according to claim 1, characterized in that: The plurality of heliostats include a first heliostat and a second heliostat, wherein a distance between the first heliostat and the absorption tower is smaller than a distance between the second heliostat and the absorption tower; The height of the reflecting surface of the first heliostat from the ground plane is less than the height of the reflecting surface of the second heliostat from the ground plane.

4. The light focusing and splitting system according to claim 3, characterized in that: A plurality of the first heliostats surround the absorption tower to form a first heliostat array ring; and a plurality of the second heliostats surround the first heliostat array ring to form a second heliostat array ring.

5. The light focusing and splitting system according to claim 4, characterized in that: A plurality of the photovoltaic devices surround the first heliostat array ring to form a photovoltaic device array ring, and the second heliostat array ring surrounds the photovoltaic device array ring.

6. The light focusing and splitting system according to claim 5, characterized in that: The first heliostat array ring is circular or arc-shaped, the second heliostat array ring is circular or arc-shaped, and the photovoltaic device array ring is circular or arc-shaped.

7. The light focusing and splitting system according to claim 3, characterized in that: It also includes a mounting base, the mounting base includes a plurality of mounting surfaces arranged in a stepped manner; the plurality of mounting surfaces include a first mounting surface and a second mounting surface, the height of the first mounting surface from the ground plane is less than the height of the second mounting surface from the ground plane; The first heliostat is installed on the first installation surface, and the second heliostat is installed on the second installation surface.

8. The light focusing and splitting system according to claim 7, characterized in that: The photovoltaic device arranged corresponding to the first heliostat is installed on the first installation surface.

9. The light focusing and splitting system according to claim 3, characterized in that: Also included is a mounting base, the mounting base including a mounting slope; The first heliostat and the second heliostat are installed on the installation slope.

10. The light focusing and splitting system according to claim 1, characterized in that: It also includes concentrated light catalytic hydrogen production equipment and / or concentrated light quantum power generation equipment; The concentrated light catalytic hydrogen production equipment and the concentrated light quantum power generation equipment are connected to the absorption tower.

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