JP2012112604A - Reflecting device and solar heat power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar heat power generation system which can reduce the risks of the collapse by wind or the failure in a drive mechanism, and to provide a reflecting device for the solar heat power generation system.SOLUTION: The reflecting device includes a plurality of divided reflection mirrors, and at least one of the plurality of reflection mirrors is swingably supported by a flexible elastic member. Otherwise, the reflecting device includes: a film-like reflection mirror; a backing member supporting the reflection mirror that is curled in a free state; a supporting body supporting the backing member; and a fixing member fixing the backing member, in a desired shape resisting against curling, to the supporting body. The reflecting device is configured to release the fixing state of the fixing member when a predetermined wind pressure acts on the reflection mirror or the backing member.

Description

  The present invention relates to a solar thermal power generation system that uses solar heat as energy, and a solar light collecting reflector used in the solar thermal power generation system.

Conventional thermal power generation by burning fossil fuel has a relatively low equipment cost and is widely used all over the world. On the other hand, reduction of CO ₂ (carbon dioxide) is required from the viewpoint of protecting the global environment, and solar energy has attracted attention as clean energy that does not give a load to the environment.

  This type of power generation using solar energy is called tower-type solar power generation, and sunlight reflected by a number of reflectors (heliostats) placed around the tower is collected on the tower. One that generates power using heat energy obtained by condensing and heating a heat receiver is known (see, for example, Patent Document 1).

  Also known is trough solar power generation, which uses a curved mirror, concentrates sunlight on a pipe installed in front of the curved mirror, heats the liquid (oil, etc.) flowing in the pipe, and generates electricity with that heat. (For example, refer to Patent Document 2).

JP 2010-236699 A JP 2001-201187 A

  The solar thermal power generation system as described above is a large facility for obtaining a large light receiving area, and is installed on a large scale in a land having a long sunshine time in order to obtain a sufficient amount of heat. A suitable place for this is considered to be a desert area close to the coastline, which is advantageous for transporting equipment.

  However, when installing a large number of mirrors in the practical application of the solar thermal power generation system, as described above, the land where the solar thermal power generation system is installed is a relatively flat place, so there is no shielding around it, In addition, since the reflecting surface area of each reflecting mirror is large, it has been clarified that resistance to strong winds (particularly gusts) is required.

  In particular, in the case of trough solar power generation, since a curved mirror is used, wind cannot be passed, and air gathers at the center along the curved mirror, so this problem becomes more prominent.

  With respect to such a problem, the devices described in Patent Documents 1 and 2 do not take into account strong winds (particularly gusts), and there is a possibility that the drive mechanism may fail or collapse.

  In view of the above problems, an object of the present invention is to provide a solar thermal power generation system capable of reducing the risk of unexpected damage due to wind, particularly gusts, and failure of a drive mechanism, and a reflector for the solar thermal power generation system. It is.

  The above object is achieved by the following configuration.

  (1) A reflection device used in a solar thermal power generation system using sunlight, wherein the reflection device has a plurality of divided reflection mirrors, and at least one of the plurality of reflection mirrors is flexible. A reflection device characterized in that it is supported by a flexible elastic member in a swingable manner.

  (2) The reflection device according to (1), wherein the reflection device forms a trough shape with a plurality of the reflection mirrors.

  (3) The reflection device according to (1), wherein the reflection device is formed by a plurality of the reflection mirrors in a planar shape, a spherical shape, or a parabolic shape.

  (4) A reflection device used in a solar thermal power generation system using sunlight, wherein the reflection device includes a film-like reflection mirror and a backing member that supports the reflection mirror that is curled in a free state; A support member for supporting the backing member; and a fixing member for fixing the backing member to the support member in a desired shape against curling. A predetermined wind pressure is applied to the reflecting mirror or the backing member. The reflector is configured to release the fixing of the fixing member when the is operated.

  (5) A solar thermal power generation system comprising the reflection device according to any one of (1) to (4).

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the solar thermal power generation system which can reduce the danger of the collapse by a wind, and the failure of a drive mechanism, and the reflecting device for this solar thermal power generation system.

It is a perspective view which shows the outline | summary of the reflective apparatus for condensing of the trough type solar thermal power generation system which concerns on 1st Embodiment. It is a schematic diagram which shows the cross section which cut | disconnected the reflection apparatus shown in FIG. 1 by the GG line. It is a figure which shows the other example of the elastic member which supports a reflective mirror and a backing plate. It is a perspective view which shows an example of the reflecting device used for the tower type solar thermal power generation system which concerns on 1st Embodiment. It is a schematic diagram which shows the cross section which cut | disconnected the reflection apparatus shown in FIG. 4 by the FF line. It is a perspective view which shows the outline | summary of the reflective apparatus for condensing of the trough type solar thermal power generation system which concerns on 2nd Embodiment. It is a schematic diagram which shows the cross section which cut | disconnected the reflection apparatus shown in FIG. 6 with the HH line | wire. It is a figure which shows a state when the reflective mirror and backing plate of the reflecting device shown in FIG. 7 received a strong wind or a gust. It is a figure which shows the example of a plate-shaped fixing member. It is a figure which shows the other fixing method of a backing plate and a support body.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited thereto.

(First embodiment)
FIG. 1 is a perspective view illustrating an outline of a condensing reflection device of the trough solar power generation system according to the first embodiment.

  The concentrating reflecting device of the trough solar thermal power generation system shown in the figure has, as main components, a plurality of reflecting mirrors 10 (four in this figure, but not limited to this), a support 18, It comprises a gantry 20, a heat collecting tube 30, a motor 50 and the like.

  The plurality of reflection mirrors 10 have an envelope surface formed in a curved surface shape (a parabola in this example) in which a cross-sectional line perpendicular to the rotation shaft 21 (substantially the center of the heat collecting tube 30) changes in curvature. It is a trough shape in which a cross section parallel to is formed in a straight line. Each of the reflecting mirrors 10 is a film-like surface mirror or back mirror, and each is supported by a backing plate (not shown), and the backing plate is supported by a support 18. The heat collecting tube 30 is formed hollow so that a heat receiving fluid such as oil flows inside, and is disposed near the focal position of the parabola of the reflecting mirror 10.

  A hollow tubular frame 35 through which the heat collecting tube 30 passes is formed on the outer surfaces of both ends of the support 18 and is supported by the gantry 20. A large-diameter gear 40 is fixed to the tubular frame 35, and an output shaft gear of a motor 50 with a speed reducer is meshed with the gear 40.

  Thus, by driving the motor 50, the gear 40, the tubular frame 35, and the support 18 are rotated, and the direction of the backing plate and the reflecting mirror 10 can be displaced according to the movement of the sun. ing.

  FIG. 2 is a schematic diagram showing a cross section of the reflecting device shown in FIG. 1 cut along a line GG.

  As shown in the figure, each of the plurality of reflecting mirrors 10 is supported by a backing plate 11. The backing plate 11 is supported by a support 18 via a flexible elastic member (in this figure, a rubber member) 12.

  In clear weather, as shown in FIG. 6A, the sunlight is set to be collected by the reflecting mirror 10 onto the heat collecting tube 30 disposed near the focal position.

  On the other hand, when a strong wind or gust is received, the reflecting mirror 10 is pressed against the reflecting mirror 10 and the backing plate 11 by the wind pressure, as shown in FIG. 12 is bent, and the direction of the reflecting mirror 10 and the backing plate 11 is changed to receive air (wind).

  In this way, by supporting the reflecting mirror 10 so as to be swingable by the flexible elastic member 12, the force received by the reflecting mirror 10 and the backing plate 11 when receiving a strong wind or a gust can be reduced and collapsed. And the risk of failure of the drive mechanism can be reduced. FIG. 2 shows an example in which all of the divided reflection mirrors 10 are swingably supported by the elastic members 12, but only the reflection mirror 10 in the central part, which is more susceptible to wind pressure, is selectively swung. You may support it freely.

  FIG. 3 is a diagram illustrating another example of the elastic member 12 that supports the reflection mirror 10 and the backing plate 11. FIG. 3 also shows a cross section taken along line GG shown in FIG.

  FIG. 2A shows a case where a coil spring is used as the elastic member 12. FIG. 2B shows the elastic member 12 using a thin plate. Even in the configuration shown in FIGS. 2A and 2B, when a strong wind or gust is received, the reflection mirror 10 and the backing plate 11 are pressed by the wind pressure as shown in FIG. The elastic member 12 is bent by this pressing force, and the direction of the reflection mirror 10 and the backing plate 11 can be changed to flow air (wind).

  In this example, the example in which the reflecting mirror is supported by the backing plate has been described. However, the present invention is not limited to this, and a reflecting mirror made of glass or metal that is a rigid body may be supported by the support 18. Good.

  FIG. 4 is a perspective view showing an example of a reflection device used in the tower solar power generation system according to the first embodiment.

  In the reflecting device shown in the figure, a plurality of planar reflecting mirrors 110 (four in this figure, but not limited to this) are supported by a support 118. The support 118 has a rotation shaft 131 formed in the short direction of the reflection mirror 110 and fits through a hole formed in the fork 135.

  A worm wheel 132 is fixed to the rotating shaft 131. A worm gear 133 rotated by a motor 134 fixed to the fork 135 is engaged with the worm wheel 132. Thus, by driving the motor 134, the support 118 can be rotated around the F axis in the figure, and the direction around the F axis of the reflection mirror 110 (inclination of the reflection mirror 110) can be changed.

  Similarly, a worm wheel 142 is fixed to a rotating shaft 141 formed at the center of the fork 135. A worm gear 143 that is rotated by a motor 144 fixed to the base 145 is engaged with the worm wheel 142. Thus, by driving the motor 144, the rotation shaft 141 can be rotated around the V axis in the figure, and the direction of the reflection mirror 110 around the V axis can be changed. Although FIG. 5 shows the worm wheel and the worm gear exposed, it is preferable that the worm wheel and the worm gear are covered with a dustproof cover or the like.

  Although not shown, sensors for detecting the inclination angle of the support 118 around the F axis and the direction of the fork 135 around the V axis are provided.

  In such a graticule-type tilt angle variable mechanism, the direction of the reflecting mirror 110 is always driven and controlled by the motors 134 and 144 in accordance with the position of the central reflecting mirror and the reflecting device and the position of the sun. Is reflected toward the central reflector.

  In FIG. 4, the variable tilt angle mechanism is described as a gratitude base type, but an equatorial ritual type in which the fork 135 is rotated around the polar axis may be used.

  FIG. 5 is a schematic diagram showing a cross section of the reflecting device shown in FIG. 4 cut along line FF.

  As shown in FIG. 2A, the plurality of reflecting mirrors 110 are supported by a support body 118 via elastic members 12 (coil springs in the present figure) 12 having flexibility.

  On the other hand, when a strong wind or gust is received, the reflecting mirror 110 is pressed by the wind pressure as shown in FIG. 12 is bent, and the direction of the reflecting mirror 110 is changed to receive air (wind). Thereby, the force received by the reflection mirror 110 when receiving a strong wind or gust can be reduced, and the risk of collapse or failure of the drive mechanism can be reduced.

  In addition, although FIG. 5 demonstrated the example which used the coil spring as an elastic member, of course, you may support the reflective mirror 110 with flexible members, such as a rubber member.

  4 and 5, the planar reflection mirror 110 has been described, but it is needless to say that the present invention can be applied to a reflection mirror having a spherical surface or a paraboloid.

(Second Embodiment)
FIG. 6 is a perspective view showing an outline of a condensing reflection device of the trough solar thermal power generation system according to the second embodiment.

  The reflector shown in FIG. 1 differs from the reflector shown in FIG. 1 in that the reflecting mirror 10 is supported by a backing plate (not shown), and the backing plate is supported by the support 18. In a free state, the support member 18 is formed so as to be in a small and rounded state (hereinafter referred to as a curl). It is fixed to.

  FIG. 7 is a schematic view showing a cross section of the reflecting device shown in FIG. 6 cut along the line HH.

  As shown in the figure, a backing plate 11 that is in a curled state in a free state is fixed to a support 18 by a fixing member 15 with a cross-section being parabolic against the curl. Reference numeral 16 denotes a screw. In fine weather, as shown in the figure, the sunlight is collected by the reflecting mirror 10 onto the heat collecting tube 30 disposed near the focal position.

  FIG. 8 is a diagram illustrating a state when the reflection mirror and the backing plate of the reflection device illustrated in FIG. 7 are subjected to strong wind or gust.

  When the reflecting mirror 10 and the backing plate 11 are subjected to a strong wind or gust, as shown in the figure, the fixing member 15 is divided into 15a and 15b in the figure by the wind pressure, and the fixing is released. Is curled. The backing plate 11 is preferably formed of a thin metal plate or an elastic member. Further, it is preferable that the curl is formed so as not to come into contact with the heat collecting tube when curled or deformed into a curled state.

  In this way, the backing member that is curled in the free state is fixed to the support in a desired shape against the curl, and when a predetermined wind pressure is applied to the reflecting mirror and the backing member, the fixing is performed. By being configured to be released and curled, the risk of destruction or failure of the drive mechanism can be reduced.

  Although FIG. 8 shows an example in which the backing plate is configured as a single sheet and curled on both sides of the heat collecting tube 30, the present invention is not limited to this, and the backing plate is divided and each is curled. May be.

  FIG. 9 is a diagram illustrating an example of a plate-like fixing member.

  As shown in FIGS. 2A and 2B, the fixing member 15 has round holes into which screws are inserted at two locations, and is fixed to the support 18 using one of the round holes. It is fixed to the backing plate 11 using a round hole. When a strong wind or gust is received, the constricted portion 15k having the weakest strength is broken and divided, and the backing plate 11 is in the state shown in FIG.

  The fixing member 15 shown in FIG. 3C has a part of at least one of the round holes formed at two positions missing, and when the strong wind or gust is received, the missing part expands. Accordingly, the fixing is released and the backing plate 11 is in a state as shown in FIG.

  Note that the constriction of the fixing member shown in FIGS. 9A and 9B is formed so as to be broken before other members when a predetermined wind pressure is applied. Further, in the case of the fixing member shown in FIG. 9C, the defect portion is formed so as to release the fixation before the other members are destroyed when a predetermined wind pressure is applied.

  FIG. 10 is a diagram showing another method for fixing the backing plate 11 and the support 18.

  The fixing member 15 shown in FIG. 5A is constituted by a screw in which a constricted portion 15k is formed. In this case, when a strong wind or a gust of wind is applied, the constricted portion 15k having the weakest strength is broken and divided.

  In FIG. 5B, the projection 11t is formed on the backing plate 11, the bifurcated portion 18f is formed on the support 18, the projection 11t is inserted into the bifurcated portion 18f, and the fixing member 15 that is a screw is tightened. It is fixed by frictional force. In this case, when a strong wind or gust exceeding the frictional force is received, the protrusion 11t is detached and the fixation is released.

  In FIG. 5C, a spherical portion 11q is formed on the backing plate 11, and an elastic member 19 in which a hole portion 19h having a hole shape smaller than the diameter of the spherical portion 11q is formed on the support body 18 is fixed. The spherical portion 11q is press-fitted into the hole portion 19h of the body member 19. In this case, when a strong wind or gust exceeding the holding force by the elastic member 19 is received, the spherical portion 11q is released and the fixation is released.

  In the fixing method shown in FIG. 10 (a), the constricted portion 15k is formed to break before other members when a predetermined wind pressure is applied. Further, in the fixing method shown in FIGS. 11B and 11C, the protrusion 11t and the spherical portion 11q are formed so as to be detached when receiving a predetermined wind pressure.

  In the second embodiment, the reflector for concentrating the trough solar power generation system has been described as an example, but the reflector used in the tower solar power generation system as shown in FIG. 4 is also used. Needless to say, it is applicable.

DESCRIPTION OF SYMBOLS 10,110 Reflection mirror 11 Backing plate 12 Elastic member 15 Fixing member 18, 118 Support body 20 Mounting frame 21 Rotating shaft 30 Heat collecting tube 35 Tubular frame 40 Gear 50 Motor 131, 141 Rotating shaft 132, 142 Worm wheel 133, 143 Worm gear 134, 144 Motor 135 Fork 145 Base

Claims (5)

A reflector used in a solar thermal power generation system using sunlight,
The reflection device has a plurality of divided reflection mirrors,
A reflecting device, wherein at least one of the plurality of reflecting mirrors is swingably supported by a flexible elastic member.   The reflection device according to claim 1, wherein the reflection device forms a trough shape with the plurality of reflection mirrors.   2. The reflection device according to claim 1, wherein the reflection device is formed by a plurality of the reflection mirrors in a planar shape, a spherical shape, or a parabolic shape. A reflector used in a solar thermal power generation system using sunlight,
The reflecting device includes a film-like reflecting mirror, a backing member that supports the reflecting mirror that is curled in a free state, a support that supports the backing member, and the backing member that resists curling as desired. A fixing member that is fixed to the support in a state of
A reflection device configured to release the fixing of the fixing member when a predetermined wind pressure is applied to the reflection mirror or the backing member.   A solar thermal power generation system comprising the reflection device according to any one of claims 1 to 4.

Images