Heliostat

Abstract

The embodiment of the invention provides a heliostat. The invention relates to the technical field of heliostats. The heliostat comprises a reflecting surface and a bracket for supporting the reflecting surface; the reflecting surface comprises a plurality of lenses, and light spots reflected by the plurality of lenses coincide together. The heliostat provided by the embodiment of the invention is used for realizing high-multiple light condensation.

Description

Technical Field

[0001] The present invention relates to the technical field of heliostats, and in particular to a heliostat. 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. Currently, the concentration ratio of heliostats does not exceed 15 times, and high-multiple concentration cannot be achieved. Summary of the invention

[0004] An embodiment of the present invention provides a heliostat to achieve high-power focusing.

[0005] An embodiment of the present invention provides a heliostat, comprising a reflective surface and a bracket for supporting the reflective surface; the reflective surface comprises a plurality of lenses, and light spots reflected by the plurality of lenses overlap.

[0006] Optionally, the plurality of lenses have the same surface shape.

[0007] Optionally, the surface shape of the lens includes a parabola.

[0008] Optionally, the edges of the lens are square.

[0009] Optionally, the side length of the square is greater than or equal to 600 mm.

[0010] Optionally, the plurality of lenses include a first lens and a second lens, and the side length of the first lens is greater than the side length of the second lens;

[0011] The second lens is arranged on the periphery of the first lens.

[0012] Optionally, the reflective surface further includes a solar panel, and the solar panel is located at the periphery of the lens.

[0013] Optionally, a storage battery is also included, which is electrically connected to the solar panel and is used to store the electrical energy generated by the solar panel.

[0014] Optionally, the lens includes an optical coating, and the optical coating uses reflection focusing and / or transmission dispersion to irradiate lights of different wavelength bandwidths of the same beam of light onto different optical materials in the optical coating.

[0015] Optionally, the outer edge of the bracket is rounded.

[0016] In the embodiment of the present invention, each lens is an independent reflection unit, which is equivalent to the whole formed by splicing multiple lenses in the related art. In the embodiment of the present invention, a single lens focuses light separately, and the light spots reflected by multiple lenses overlap together. The light spots focused by multiple lenses converge at the same point instead of being dispersed in different spatial positions, thereby improving the focusing ability and achieving high-multiple focusing. As an example, the heliostat provided in the embodiment of the present invention solves the problem of a mirror surface greater than 20 square meters and a focusing ratio of more than 30 times, and achieves high-multiple focusing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic top view of a heliostat provided in an embodiment of the present invention;

[0018] Figure 2 A schematic top view of another heliostat provided by an embodiment of the present invention;

[0019] Figure 3 A schematic top view of another heliostat provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] 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.

[0021] Circular heliostats are the most effective structural form for achieving high-quality circular light spots, and can meet the requirements for mirror frame stability in various outdoor climate environments. Currently, the concentration ratio of heliostats does not exceed 15 times, and high-multiple concentration cannot be achieved.

[0022] Research has found that in related technologies, multiple lenses are spliced ​​into the shape of a concave mirror. Each of the lenses is a part of the concave mirror as a whole. The light spot reflected by the lens is a part of the light spot reflected by the concave mirror. The light spots reflected by multiple lenses are mainly formed into a large overall light spot by splicing. For a single lens, the light spot after its reflection is a part of a circular light spot, or it can be a special-shaped light spot, not a circular light spot. As a result, the current heliostat focusing ratio does not exceed fifteen times, and high-multiple focusing cannot be achieved.

[0023] Figure 1A schematic top view of a heliostat provided in an embodiment of the present invention, referring to Figure 1 The heliostat includes a reflecting surface 100 and a bracket for supporting the reflecting surface 100 (in Figure 1 The structure of the bracket can adopt the structure in the related art, which will not be described in detail here. The reflecting surface 100 includes a plurality of lenses 20, and the light spots reflected by the plurality of lenses 20 overlap.

[0024] In the embodiment of the present invention, each lens 20 is an independent reflection unit, which is equivalent to a whole formed by splicing multiple lenses in the related art. In the embodiment of the present invention, a single lens 20 focuses light separately, and the light spots reflected by multiple lenses 20 overlap together. The light spots focused by multiple lenses 20 converge at the same point instead of being dispersed in different spatial positions, thereby improving the focusing ability and achieving high-multiple focusing. As an example, the heliostat provided in the embodiment of the present invention solves the problem of a mirror surface greater than 20 square meters and a focusing ratio of more than 30 times, and achieves high-multiple focusing.

[0025] Exemplarily, the light spots reflected by the multiple lenses 20 have the same shape, and the multiple light spots with the same shape overlap at the same spatial position. The light spot reflected by the lens 20 is an approximately circular reflected light spot.

[0026] Optionally, refer to Figure 1 , multiple lenses 20 have the same surface shape. On the one hand, the difficulty of processing and assembling the heliostat can be reduced. On the other hand, the light spots reflected by multiple lenses 20 with the same surface shape have the same shape. It is easy to achieve the superposition of the light spots reflected by multiple lenses 20 at the same spatial position.

[0027] Optionally, refer to Figure 1 The surface of the lens 20 includes a parabola. The parabola-shaped lens 20 reflects and converges the sunlight to form an approximately circular light spot. In other embodiments, the lens 20 may also include other surface shapes.

[0028] Optionally, refer to Figure 1 , the edge of the lens 20 is square. During the assembly process, the flat lens 20 is mounted on the bracket, and after adjustment, it becomes a curved mirror with a certain curvature. When the square is adjusted, the force points at various spatial positions are relatively uniform. Therefore, the edge of the lens 20 is set to be a square.

[0029] Optionally, refer to Figure 1 The edge of the lens 20 is square, and the side length of the square is greater than or equal to 600 mm.

[0030] Figure 2 A top view schematic diagram of another heliostat provided in an embodiment of the present invention, referring to Figure 2, the plurality of lenses 20 include a first lens 21 and a second lens 22, and the side length of the first lens 21 is greater than the side length of the second lens 22. The second lens 22 is disposed at the periphery of the first lens 21. The second lens 22 is a smaller lens 20, and the first lens 21 is a larger lens. After the first lenses 21 are spliced ​​and arranged, the smaller second lens 22 is filled in the gap between adjacent first lenses 21 along the circumferential direction and at the periphery of the first lens 21. The lenses 20 can be filled within the effective area. And the shape of the reflective surface 100 is spliced ​​as close to a circle as possible and as much as possible (such as Figure 2 (shown by the dashed line).

[0031] Figure 3 A top view schematic diagram of another heliostat provided in an embodiment of the present invention, referring to Figure 3 The reflecting surface 100 further includes a solar panel 30, which is located at the periphery of the lens 20. The solar panel 30 fills the space at the periphery of the lens 20, and will not affect the quality of the reflected light spot of the lens 20; nor will it occupy the space originally used for reflection, and will not reduce the reflective area of ​​the reflecting surface 100. The solar panel 30 is provided, and the solar panel 30 has a photovoltaic power generation function, and the solar panel 30 provides electric power for the heliostat to work.

[0032] Furthermore, the heliostat also includes a battery ( Figure 3 The battery is electrically connected to the solar panel 30, and the battery is used to store the electric energy generated by the solar panel 30. Therefore, the heliostat can continue to operate in the absence of sunlight, and the power supply time of the heliostat is longer.

[0033] Optionally, the lens 20 includes a light coating, which uses a reflection focusing and / or transmission dispersion method to irradiate light of different wavelength bandwidths of the same light beam onto different optical materials in the light coating, so as to improve the utilization rate of light.

[0034] Optionally, the outer edge of the bracket is circular. The circular bracket is suitable for the nearly circular reflecting surface 100. The circular bracket occupies a small area. The circular shape has good resistance to wind, vibration, etc. and good stability.

[0035] For example, reference Figure 3 The heliostat further includes a support point 40 , and the lens 20 is fixed to the bracket via at least one support point 40 .

[0036] As an example, the lens 20 is fixed to the bracket via five supporting points 40. One supporting point 40 is disposed at the center of the square lens 20, and the remaining four supporting points 40 are disposed at the four corners of the square lens 20. In other embodiments, the lens 20 may also be fixed to the bracket via other numbers of supporting points 40.

[0037] 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 heliostat, characterized in that: It comprises a reflecting surface and a bracket for supporting the reflecting surface; the reflecting surface comprises a plurality of lenses, and the light spots reflected by the plurality of lenses overlap together.

2. The heliostat according to claim 1, characterized in that: The plurality of lenses have the same surface shape.

3. The heliostat according to claim 2, characterized in that: The surface shape of the lens includes a parabola.

4. The heliostat according to claim 1, characterized in that: The edges of the lens are square.

5. The heliostat according to claim 4, characterized in that: The side length of the square is greater than or equal to 600 mm.

6. The heliostat according to claim 4, characterized in that: The plurality of lenses include a first lens and a second lens, and the side length of the first lens is greater than the side length of the second lens; The second lens is arranged on the periphery of the first lens.

7. The heliostat according to claim 1, characterized in that: The reflective surface also includes a solar panel, and the solar panel is located on the periphery of the lens.

8. The heliostat according to claim 7, characterized in that: It also includes a storage battery, which is electrically connected to the solar panel and is used to store the electrical energy generated by the solar panel.

9. The heliostat according to claim 1, characterized in that: The lens comprises a light coating, which uses a reflection focusing and / or transmission dispersion method to irradiate lights of different wavelength bandwidths of the same light beam onto different optical materials in the light coating.

10. The heliostat according to claim 1, characterized in that: The outer edge of the bracket is round.

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