WO2014017171A1

WO2014017171A1 - Solar light collecting system and solar thermal power generation system

Info

Publication number: WO2014017171A1
Application number: PCT/JP2013/065350
Authority: WO
Inventors: 俊泰光成
Original assignee: 住友重機械工業株式会社
Priority date: 2012-07-23
Filing date: 2013-06-03
Publication date: 2014-01-30
Also published as: JP2014020749A; JP5902058B2

Abstract

Provided are a solar light collecting system whereby light collection rate per mirror can be improved, and a solar thermal power generation system. The present invention is a solar light collecting system (10) that is provided with: a first light collecting mirror (13), which collects solar light (T) to a first receiver (12); and a second light collecting mirror (23), which collects solar light to a second receiver (22). The solar light collecting system is also provided with: a selective light collecting mirror (14), which is capable of selectively collecting the solar light (T) to the first receiver (12) or the second receiver (22); and a control apparatus (A), which controls the direction of the selective light collecting mirror (14). On the basis of the irradiation angle and/or irradiation time of the solar light (T), the control apparatus (A) switches a subject, to which the light is to be collected by the selective light collecting mirror (14), to the first receiver (12) or the second receiver (22).

Description

Solar condensing system and solar power generation system

The present invention relates to a solar condensing system and a solar thermal power generation system.

In recent years, in view of problems caused by depletion of fossil fuels and carbon dioxide emissions, the use of sunlight, which is renewable natural energy, has been widely studied. For the use of solar energy, a method of directly converting sunlight into electricity by a solar cell and a method of absorbing and using sunlight as solar heat are known. The technique used as solar heat includes a method of generating power indirectly by using a turbine or the like using the heat.

The use of solar heat enables stable supply by heat storage, and this point is attracting attention as an advantage over solar cells. In particular, when using heat itself without generating electricity, the efficiency is high, and the significance of using solar heat is great. For this reason, solar concentrating systems that can use solar heat in medium-sized plants such as industrial steam supply are being studied not only in Japan but also in countries around the world such as Europe.

As a solar condensing system, a Fresnel method (linear Fresnel method), a tower method, a trough method, a dish method, and the like are known. Regarding the linear Fresnel method, for example, Patent Document 1 discloses a solar condensing system that condenses light on a linear receiver by reflecting sunlight with strip-shaped mirrors arranged in a plurality of rows. As for the tower method, for example, Patent Document 2 discloses a solar condensing system that focuses sunlight on a receiver provided at the top of the tower by reflecting sunlight with a number of heliostats arranged around the tower. Has been.

European Patent Application Publication No. 2051022A2 JP 2011-220286 A

Incidentally, the luminous flux of sunlight (sunlight energy) that can be received by the condenser mirror is proportional to the cosine component of the incident angle of sunlight, and is called the cosine effect. For this reason, in the case of the morning or evening, when the condensing mirror has to receive sunlight at a large incident angle, there is a problem in that the condensing rate is reduced due to the cosine effect.

Therefore, an object of the present invention is to provide a solar condensing system and a solar thermal power generation system capable of improving the condensing rate per mirror.

In order to solve the above problems, the present invention provides a first condensing mirror that condenses sunlight on a first receiver and a second condensing light that condenses sunlight on a second receiver. A solar condensing system comprising: a selective condensing mirror that condenses sunlight to one of the first receiver and the second receiver; and a control for controlling the selective condensing mirror And the control means switches the light collection target of the selective light collection mirror based on at least one of the irradiation angle and time of sunlight.

According to the solar condensing system which concerns on this invention, it is equipped with the selective condensing mirror which can selectively condense sunlight with respect to a 1st receiver or a 2nd receiver, and among sunlight irradiation angle and time By switching the light collecting target of the selective light collecting mirror based on at least one, it is possible to receive sunlight as much as possible in front of the mirror and avoid a decrease in efficiency due to the cosine effect. The light rate can be improved.

The solar condensing system according to the present invention may be a Fresnel type condensing system.
According to this solar condensing system, it is possible to simplify the control of the selective condensing mirror by switching the condensing target as compared with the tower type condensing system that requires three-dimensional control.

In the solar condensing system according to the present invention, the selective condensing mirror is a mirror having a curved surface, and the collecting point of the selective condensing mirror is from the selective condensing mirror of the first receiver and the second receiver. It may be fitted to a remote receiver.
According to this solar condensing system, the condensing rate can be increased by adopting a curved mirror having a collecting point instead of a flat mirror. Moreover, in this solar condensing system, since it is comparatively easy to condense to the receiver closer to the selective condensing mirror among the first receiver and the second receiver, selective condensing is performed on the farther receiver. It is possible to collect light effectively by adjusting the collecting points of the mirrors.

In the solar condensing system according to the present invention, the selective condensing mirror includes a transparent substrate having a surface on which sunlight is incident and a back surface opposite to the surface, and a reflective layer formed on the back surface of the transparent substrate. The section of the transparent substrate that is rotatable or swingable about a predetermined central axis and perpendicular to the central axis may have an arc shape that is recessed toward the reflective layer.

According to this solar condensing system, it is a catadioptric condensing mirror that performs refraction of sunlight by a transparent substrate and reflection by a reflecting layer, thereby making it possible to compare the image plane with a conventional condensing mirror that is surface reflection. Since the influence of bending can be suppressed, the light collection rate with respect to the receiver can be significantly improved. As a result, the size of the condensing spot with respect to the receiver and the secondary mirror is reduced, so that the accuracy of tracking control with respect to the sun is eased, and leakage light that does not reach the receiver can be reduced.

The solar thermal power generation system according to the present invention includes any one of the solar condensing systems described above, and generates power using heat obtained by the first receiver and the second receiver.
According to the solar thermal power generation system according to the present invention, it is possible to significantly improve the concentration ratio of sunlight by providing the above-described solar condensing system. As a result, sunlight can be efficiently absorbed and solar heat can be obtained, so that the efficiency of solar thermal power generation can be improved.

According to the present invention, the light collection rate per mirror can be improved.

It is a perspective view which shows the solar thermal power generation system which concerns on 1st Embodiment. It is a side view which shows the solar condensing system of the state which does not switch the condensing object of a selective condensing mirror. It is a side view which shows the solar condensing system of the state which switched the condensing object of the selective condensing mirror. (A) is explanatory drawing of the state which does not switch the condensing object of a selective condensing mirror. (B) is explanatory drawing of the state which switched the condensing object of the selective condensing mirror. It is a figure for demonstrating the setting of the condensing point of the selective condensing mirror which concerns on 2nd Embodiment. It is a side view for demonstrating the condensing state by the selective condensing mirror which concerns on 3rd Embodiment. It is an expanded sectional view of the selective condensing mirror along the YZ plane. It is a side view which shows the state which does not switch the condensing object of the selective condensing mirror in the solar thermal power generation system which concerns on 4th Embodiment. It is a side view which shows the state which switched the condensing object of the selective condensing mirror in the solar thermal power generation system which concerns on 4th Embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
As shown in FIGS. 1 and 2, the solar thermal power generation system according to the first embodiment is a system that generates power using solar heat obtained by condensing sunlight, and is a linear system that condenses sunlight. A Fresnel solar condensing system 10 is provided. This solar condensing system 10 has four condensing devices 11 to 41.

Hereinafter, the first light collecting device 11 will be described with reference to FIG. About the 2nd condensing device 21, the 3rd condensing device 31, and the 4th condensing device 41, since it is the same structure as the 1st condensing device 11, description is abbreviate | omitted. Moreover, in each figure, the irradiation direction of sunlight is shown as an arrow T, and a part of the third light collecting device 31 and the fourth light collecting device 41 are not shown.

The first condensing device 11 includes a first receiver 12, a first condensing mirror 13,

selective condensing mirrors

14 and 15, a secondary mirror 16, and a control device (control means) A. Hereinafter, the extending direction of the first receiver 12 extending linearly will be described as the X-axis direction, the vertical direction as the Z-axis direction, and the direction orthogonal to both the X-axis direction and the Z-axis direction as the Y-axis direction. .

The first receiver 12 is a tubular member through which a heat medium flows. The heat medium may be gaseous or liquid. The first receiver 12 extends linearly in the X-axis direction. The first receiver 12 is fixed to the ground, and is supported at a high place by left and right support bases 17.

The first condensing mirror 13 is a condensing mirror dedicated to the first receiver 12 that condenses sunlight with respect to the first receiver 12. The first condenser mirror 13 is arranged in a row in the X-axis direction along the first receiver 12, and a plurality of the rows are arranged in the Y-axis direction. The 1st condensing mirror 13 is supported by the support leg 18, and is comprised so that a solar motion can be followed and rotated.

The

selective condensing mirrors

14 and 15 are condensing mirrors that can switch the condensing target to a receiver other than the first receiver 12. That is, the

selective condensing mirrors

14 and 15 can condense sunlight with respect to receivers other than the first receiver 12.

The

selective condensing mirrors

14 and 15 are provided in a line at both ends of the first condensing device 11 in the Y-axis direction. The selective focusing

mirrors

14 and 15 are arranged so as to sandwich the first focusing mirror 13 composed of a plurality of rows in the Y-axis direction. The configuration of the selective collector mirrors 14 and 15 is the same as that of the first collector mirror 13. In the first embodiment, the first condenser mirror 13 and the selective condenser mirrors 14 and 15 are flat surface reflection mirrors.

The secondary mirror 16 is a bowl-shaped member that is provided so as to cover the first receiver 12 and extends downward along the first receiver 12 in the X-axis direction. The inner surface of the secondary mirror 16 is mirror-finished. The secondary mirror 16 condenses on the first receiver 12 by reflecting again the light deviated from the first receiver 12 among the reflected light of the first condenser mirror 13 and the selective condenser mirrors 14 and 15. Let

In this condensing device 11, the solar heat obtained by the first receiver 12 by the condensing of the first condensing mirror 13 and the selective condensing mirrors 14, 15 generates power through a heat medium flowing inside the first receiver 12. Supplied to the facility. As the power generation facility, for example, a steam turbine or the like can be used, and power generation is performed using solar heat supplied through a heat medium.

The control device A controls the orientation of the first condenser mirror 13 and the selective condenser mirrors 14 and 15 according to the movement of the sun. The control device A is an electronic control unit including a CPU [Central Processing Unit], ROM [Read Only Memory], RAM [Random Access Memory], and the like. The control device A may be composed of a plurality of computers.

Control device A is connected to a sunlight detector B for detecting the irradiation angle of sunlight T. The sunlight detection part B detects the incident angle of the sunlight T with respect to the ground (or the installation surface of the solar condensing system 10) as the irradiation angle of sunlight T, for example. A well-known apparatus can be employ | adopted for such a sunlight detection part B. FIG. In addition, the solar thermal power generation system which concerns on 1st Embodiment does not necessarily need to be provided with the sunlight detection part B, and the control apparatus A controls the direction of the mirror which considered the irradiation angle of sunlight T based on time. You can also. The control device A controls all the collecting mirrors of the solar collecting system 10.

As shown in FIG. 2, in the solar light collecting system 10, the first light collecting device 11, the second light collecting device 21, the third light collecting device 31, and the fourth light collecting device 41 are adjacent to each other. is set up. Each condensing

device

11, 21, 31, and 41 has one

receiver

12, 22, 32, and 42, respectively, and these receivers are arranged substantially parallel to each other. Each

receiver

12, 22, 32, 42 is connected by a pipe (not shown) and forms one heat medium flow path. In addition, each

receiver

12, 22, 32, 42 may form an independent heat medium flow path and may be connected to the power generation equipment.

Each condensing

device

11, 21, 31, 41 has first to fourth condensing mirrors 13, 23, 33, 43 that condense only on a receiver in each condensing device, and an adjacent condensing device. Selective collecting mirrors 14, 15, 24, 25, 34, and 45 that can also collect light at the receiver of the apparatus are provided. These condenser mirrors are arranged so as to be substantially equidistant in the Y-axis direction.

The gap between the collector mirrors is appropriately set in consideration of the usage environment and purpose of the solar collector system 10. That is, if the gap between the collecting mirrors is large, the solar energy acquisition efficiency per mirror area can be increased. Conversely, if the gap between the collecting mirrors is reduced, the number of collecting mirrors can be increased to increase the light collection rate and reduce heat loss. In addition, land use efficiency increases.

In the solar light collecting system 10 according to the present embodiment, if the gap between the collecting mirrors is small, blocking may occur where the reflected light is blocked by the adjacent collecting mirror, so that a certain amount of gap is required. Specifically, when the gap between the collecting mirrors is expressed by the number r of collecting mirrors (horizontal posture collecting mirrors) entering the gap, 1.0 <r <2.0 from the viewpoint of cost. It is preferable that 1.25 <r <1.75. From the viewpoint of performance priority (temperature environment priority), 0.2 <r <0.7 is preferable, and 0.4 <r <0.5 is more preferable.

The selective condensing mirrors 14, 15, 24, 25, 34, and 45 are disposed at positions adjacent to the condensing mirror of the adjacent condensing device among the condensing mirrors disposed at substantially equal intervals. Note that the number and position of the selective focusing mirrors are not limited to the configuration shown in FIG.

FIG. 3 is a side view showing the solar condensing system in a state in which the condensing target of the selective condensing mirror is switched. In the solar condensing system 10 shown in FIG. 3, the condensing target is switched to a receiver that can condense sunlight efficiently with respect to the selective condensing mirrors 14, 24, and 34.

Here, switching of the light collection target will be described using the selective light collection mirror 14 of the first light collection device 11 as an example. 4A shows a state where the light collecting target of the selective light collecting mirror 14 is not switched, and FIG. 4B shows a state where the light collecting target of the selective light collecting mirror 14 is switched. . 4A corresponds to the state shown in FIG. 2, and FIG. 4B corresponds to the state shown in FIG.

As shown in FIG. 4A, when sunlight T is irradiated from a direction other than directly above, the selective condensing mirror 14 is used to reflect the sunlight T to the first receiver 12. Needs to receive sunlight at a large incident angle θ.

Here, the incident angle θ is an angle formed between the sunlight T incident on the selective collector mirror 14 and the central axis Cn of the selective collector mirror 14 in the YZ plane. The central axis Cn is, for example, an axis that passes through the center of the reflective surface of the selective collector mirror 14 in the YZ plane and is perpendicular to the reflective surface.

In this case, under the influence of the so-called cosine effect, the luminous flux of sunlight T (solar energy) that can be received by the selective condenser mirror 14 decreases as the incident angle θ of the sunlight T increases, and the condensing rate decreases. Occurs.

Therefore, as shown in FIG. 4B, the condensing target of the selective condensing mirror 14 is switched to the adjacent second receiver 22. As a result, the incident angle θ of the sunlight T with respect to the selective collector mirror 14 can be reduced, and the sunlight T can be received almost in front of the selective collector mirror 14. Can be avoided.

Next, the switching control of the light collecting target in the selective light collecting mirror 14 will be described. The control device A of the solar condensing system 10 changes the direction of the selective condensing mirror 14 based on the irradiation angle of the sunlight T detected by the sunlight detecting unit B, and switches the condensing target.

Specifically, the control device A selects and condenses the receiver having the smaller incident angle θ of the sunlight T among the first receiver 12 and the second receiver 22 based on the irradiation angle of the sunlight T. The light is collected by the mirror 14. In other words, the control device A controls the selective focusing mirror 14 so that a receiver that can reflect in the front direction of the selective focusing mirror 14 becomes a focusing target.

In addition, the control apparatus A does not necessarily need to switch the condensing object of the selective condensing mirror 14 based on the irradiation angle of sunlight T, for example, in the aspect which switches the condensing object of the selective condensing mirror 14 based on time. There may be. In this case, the light collection target of the selective light collecting mirror 14 can be switched at an appropriate timing in consideration of the position of the sun for each hour. In addition, although the selection focusing mirror 14 has been described as an example of switching the focusing target, the same applies to the other selective focusing

mirrors

15, 24, 25, 34, and 45.

According to the solar light collecting system 10 according to the first embodiment described above, the receivers that are the light collecting objects of the selective light collecting mirrors 15, 24, 25, 34, and 45 are switched based on the irradiation angle of the sunlight T. As a result, it is possible to receive sunlight T in front of the mirror as much as possible and avoid a decrease in efficiency due to the cosine effect, so that the light collection rate in the entire system can be improved.

Moreover, in this solar condensing system 10, by adopting the linear Fresnel method, the control of the selective condensing mirror by switching the condensing object is performed as compared with the tower type condensing system that requires three-dimensional control. Can be simplified. Moreover, in this solar condensing system 10, even if a plurality of concentrating devices are arranged adjacent to each other, the number of facilities that cause shadows such as a tower is less than that of a tower type condensing system, so that the condensing rate is improved. Is advantageous.

According to the solar thermal power generation system which concerns on 1st Embodiment, the condensing rate of sunlight T can be improved significantly by providing the solar condensing system 10 mentioned above. As a result, the receiver 12 can efficiently absorb the sunlight T to obtain solar heat, so that the efficiency of solar thermal power generation can be improved.

[Second Embodiment]
The solar thermal power generation system according to the second embodiment is different from the solar thermal power generation system according to the first embodiment only in the shape of the selective condensing mirror.

Specifically, the solar thermal power generation system (solar condensing system) according to the second embodiment includes a trough-shaped selective condensing mirror 54 having a curved surface. The trough-shaped selective condensing mirror 54 is a surface-reflecting mirror that reflects sunlight so as to gather at a predetermined point.

Here, FIG. 5 is a diagram for explaining the collecting points of the selective focusing mirror 54 according to the second embodiment. As shown in FIG. 5, the selective condensing mirror 54 is the second receiver 22 that is far from the selective condensing mirror 54 among the first receiver 12 and the second receiver 22 that can be selected as the condensing target. The points are matched. R shown in FIG. 5 is a trajectory drawn by the collecting point of the selective focusing mirror 54.

According to the solar thermal power generation system (solar condensing system) according to the second embodiment described above, the condensing rate is increased by employing a trough-shaped selective condensing mirror with a concentrating point instead of a plane mirror. be able to. Further, in this solar thermal power generation system, it is relatively easy to collect light to the receiver closer to the selective light collecting mirror 54 out of the first receiver 12 and the second receiver 22, so that the receiver located far away is used. By converging the collecting points of the selective condensing mirrors, it is possible to condense effectively. This contributes to the improvement of the light collection rate of the solar thermal power generation system.

[Third Embodiment]
The solar thermal power generation system according to the third embodiment is largely different from the solar thermal power generation system according to the second embodiment in that the selective condensing mirror is back-surface reflection.

FIG. 6 is a side view for explaining a selective focusing mirror 64 for back surface reflection according to the third embodiment. FIG. 7 is an enlarged cross-sectional view of the selective focusing mirror 64 along the YZ plane. FIG. 6 shows the rotation center axis P of the selective collector mirror 64 extending in the X-axis direction.

As shown in FIGS. 6 and 7, the selective condensing mirror 64 is configured to be rotatable about the rotation center axis P. Note that the selective condensing mirror 64 is not necessarily configured to be able to rotate 360 degrees, and may be configured to be swingable at less than 360 degrees. The selective condensing mirror 64 includes a transparent substrate 65, an antireflection film 66, and a reflection layer 67.

The transparent substrate 65 is made of a highly transparent resin material such as acrylic resin. The transparent substrate 65 is a plate-like member curved like a bowl, and its cross section (cross section perpendicular to the rotation center axis P) has an arc shape that is recessed toward the reflective layer 67 side. The transparent substrate 65 has sufficient rigidity to maintain its shape.

The transparent substrate 65 has a surface 65a on the receiver 12 side (front side) and a back surface 65b on the opposite side of the surface 65a. In the bowl-shaped transparent substrate 65, the cross-sectional shape (the shape on the cross section orthogonal to the rotation center axis P) along the YZ plane of the front surface 65a and the back surface 65b forms an arc shape.

Note that the front surface 65a and the back surface 65b may have the same or different curvatures of the arc of the cross-sectional shape. Moreover, the cross-sectional shape along the YZ plane of the front surface 65a and the back surface 65b may be a parabolic shape instead of an arc shape. Further, one of the cross-sectional shapes of the front surface 65a and the back surface 65b may be an arc shape and the other may be a parabolic shape.

On the surface 65a of the transparent substrate 65, an antireflection film 66 for preventing the reflection of sunlight T is formed. The antireflection film 66 is a film made of, for example, magnesium fluoride MgF ₂ . The antireflection film 66 may be a multilayer film made of a plurality of materials. By forming such an antireflection film 66, the sunlight T can be prevented from being reflected by the surface 65a. Note that the antireflection film 66 is not necessarily provided.

A reflective layer 67 is formed on the back surface 65 b of the transparent substrate 65. The reflective layer 67 is made of, for example, aluminum Al or silver Ag. The reflective layer 67 may be formed on the entire surface of the back surface 65b or may be formed on a part thereof.

The transparent substrate 65 is manufactured by injection molding in which a heat-melted resin material is injected and injected into a mold and cooled in the mold. Injection molding is suitable for producing a large number of molded articles having complicated shapes.

In the selective condensing mirror 64 of the back surface reflection configured as described above, the sunlight T passes through the antireflection film 66 and the transparent substrate 65 and enters the inside of the mirror. Thereafter, the sunlight T is reflected by the reflective layer 67 on the back surface 65b, passes through the transparent substrate 65, and exits from the antireflection film 66 on the front surface 65a to the outside. Also in the selective reflection mirror 64 for reflection on the back surface, it is preferable that the collection point is matched with the receiver located farther away.

According to the solar thermal power generation system (solar condensing system) according to the third embodiment described above, the catadioptric selective condensing mirror 64 that performs refraction of sunlight by the transparent substrate 65 and reflection by the reflective layer is employed. As a result, the influence of the curvature of field can be suppressed as compared with the conventional mirror that is surface reflection, so that the light collection rate with respect to the receiver can be greatly improved. As a result, the size of the condensing spot with respect to the receiver and the secondary mirror is reduced, so that the accuracy of tracking control with respect to the sun is eased, and leakage light that does not reach the receiver can be reduced. For the effect of the catadioptric mirror, refer to the Japanese patent application (Application No. 2011-220990) by the present inventor.

[Fourth Embodiment]
FIG. 8 is a side view showing a state before switching the light collecting target of the selective light collecting mirror of the solar thermal power generation system according to the fourth embodiment. FIG. 9 is a side view showing a state after the light collecting target of the selective light collecting mirror is switched.

As shown in FIG. 8, the solar thermal power generation system according to the fourth embodiment includes a tower-type solar condensing system 100. The tower-type solar condensing system 100 includes a first concentrating device 110 and a second concentrating device 120 that are arranged next to each other.

The 1st condensing device 110 is provided with the 1st receiver 111 provided in the upper part of the tower standing on the ground, and the 1st condensing mirror which condenses sunlight T with respect to the 1st receiver 111 112 and a selective condensing mirror 113. Similarly, the second light collecting device 120 includes a second receiver 121 provided on the top of a tower erected on the ground, and a second light collecting the sunlight T on the second receiver 121. The condenser mirror 122 and the selective condenser mirrors 123 and 124 are provided.

Each condensing

mirror

112, 113, 122, 123, 124 is a so-called dish-shaped (dish-shaped) mirror, and the reflected light is condensed at one point toward the first receiver 111 or the second receiver 121. . Each condensing mirror 112,113,122,123,124 is controlled by the control apparatus which is not illustrated, and changes direction according to the sun.

In the state shown in FIG. 8, the selective condensing mirror 124 of the second light concentrating device 120 must receive sunlight T at a large incident angle θ in order to reflect to the second receiver 121, and the cosine effect. As a result, the light collection rate is reduced.

Therefore, as shown in FIG. 9, the selective focusing mirror 124 switches the focusing target from the second receiver 121 to the first receiver 111. As a result, the incident angle θ of the sunlight T with respect to the selective collector mirror 124 can be reduced, and the sunlight T can be received almost in front of the selective collector mirror 124, so that the light collection rate is reduced due to the cosine effect. Can be avoided.

Also in the solar thermal power generation system (solar condensing system) according to the fourth embodiment described above, the receiver that is the condensing target of the selective condensing mirrors 113, 123, and 124 is switched based on the irradiation angle of the sunlight T. As a result, it is possible to receive sunlight T as much as possible in front of the mirror and avoid a decrease in efficiency due to the cosine effect, so that the light collection rate in the entire system can be improved.

The present invention is not limited to the embodiment described above.

For example, the number of light collecting devices may be three or less, or five or more, and the number of light collecting mirrors (light collecting mirrors dedicated to each light collecting device and selective light collecting mirrors) in each light collecting device. The numbers and positions are not limited to those described above. The tower method includes a beam down method. Further, the secondary mirror is not necessarily provided.

Further, the configuration of the condenser mirror is not limited to the above. For example, in a trough-shaped condensing mirror, it is possible to adopt one that appropriately adjusts the collecting point by mechanically applying a force to curve the reflecting surface. In this case, when the light collecting target is switched in the selective light collecting mirror, the collecting point can be adjusted according to the light collecting target.

Moreover, the solar condensing system described above is not limited to use for solar thermal power generation. Hot water supply using solar heat, steam supply, heating air conditioning, cooling air conditioning (high temperature heat source of absorption refrigeration machine) can be used in various fields. It is particularly suitable for applications such as factory air conditioning and steam supply in medium-scale plants. Moreover, it can also utilize as a concentrating solar cell system by arrange | positioning a solar cell to a receiver.

The present invention can be used as a solar condensing system and a solar thermal power generation system capable of improving the condensing rate per mirror.

DESCRIPTION OF SYMBOLS 10,100 ... Solar condensing system 11,110 ... 1st condensing device 21,120 ... 2nd condensing device 31 ... 3rd condensing device 41 ... 4th condensing device 12 ... 1st receiver 22 ... 2nd receiver 32 ... 3rd receiver 32 ... 4th receiver 13 ... 1st condensing mirror 23 ... 2nd condensing mirror 33 ... 3rd condensing mirror 43 ...

4th condensing mirror

16, 26, 36, 46 ...

secondary mirror

14, 15, 24, 25, 35, 44, 54, 64, 113, 114, 124 ... selective condensing mirror 65 ... transparent substrate 65a ... front surface 65b ... back surface 66 ... reflection Prevention film 67 ... Reflective layer A ... Control device (control means) B ... Sunlight detection unit Cn ... Center axis P ... Center of rotation (center axis) T ... Sunlight θ ... Incident angle

Claims

A solar condensing system comprising: a first condensing mirror that condenses sunlight with respect to a first receiver; and a second condensing mirror that condenses sunlight with respect to a second receiver. There,
A selective condensing mirror for condensing sunlight with respect to any one of the first receiver and the second receiver;
Control means for controlling the selective condensing mirror,
The said control means switches the condensing object of the said selective condensing mirror based on at least one among the irradiation angle and time of sunlight, The solar condensing system characterized by the above-mentioned.
The solar condensing system according to claim 1, which is a Fresnel type condensing system.
The selective focusing mirror is a mirror having a curved surface,
3. The solar light collecting system according to claim 1, wherein a collecting point of the selective collecting mirror is set to a receiver located far from the selective collecting mirror among the first receiver and the second receiver. .
The selective focusing mirror is
A transparent substrate having a surface on which sunlight is incident and a back surface opposite to the surface;
A reflective layer formed on the back surface of the transparent substrate,
2. The transparent substrate is configured to be rotatable or swingable about a predetermined central axis, and a cross section perpendicular to the central axis of the transparent substrate has an arc shape that is recessed toward the reflective layer side. The solar condensing system according to any one of 1 to 3.
A solar thermal power generation comprising the solar condensing system according to any one of claims 1 to 4, wherein power generation is performed using heat obtained by the first receiver and the second receiver. system.