JP2014043966A - Heat collection facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain cost of a heat collection facility including a plurality of heliostats (light convergence devices).SOLUTION: A heat collection facility includes a plurality of heliostats 30o, 30i which are installed in a heliostat installation region R, and reflect and direct sunlight to a target light convergence point. The area of a reflection surface of a mirror in the heliostat 30o, arranged in an outer peripheral side in the region R, of the plurality of heliostats 30o, 30i installed in the heliostat installation region R is smaller than that of a mirror in the heliostat 30i arranged in an inner side of the region R.

Description

  The present invention relates to a heat collection facility including a plurality of light collecting devices that collect sunlight and direct it toward a target light collecting position.

  In recent years, facilities using thermal energy obtained by concentrating sunlight at a predetermined position as environmentally friendly clean energy have been actively developed.

  As a heat collecting facility provided with a plurality of light collecting devices for concentrating sunlight at a predetermined position, for example, there is a facility described in Patent Document 1 below.

  In this heat collecting heat facility, a plurality of light collecting devices are arranged in a donut-shaped region. Each of the light collecting devices includes a reflecting mirror that reflects and collects sunlight, a driving device that changes the direction of the reflecting mirror, and a support that supports the driving device.

JP-A-11-119105

  In a heat collecting facility provided with a plurality of light collecting devices, reduction of facility cost is desired as in other facilities.

  Then, an object of this invention is to provide the heat collection equipment which can aim at cost reduction.

The heat collection facility as one aspect according to the invention for achieving the above object is as follows:
Mirrors that are arranged in a region and that have a plurality of condensing devices that condense sunlight and direct it toward a target condensing position, and the plurality of concentrating devices have mirrors that reflect and collect sunlight. The condensing element that has a structure and a support structure that supports the mirror structure, and is disposed on the outer edge side of the region among the plurality of condensing devices that are disposed in the region. The area of the reflective surface of the mirror of the apparatus is smaller than the area of the reflective surface of the mirror of the light collecting apparatus disposed inside the region.

  In the heat collecting equipment, the wind load with respect to the wind of a predetermined wind speed related to the mirror structure of the light collecting device arranged on the outer edge side is equal to the wind of the same predetermined wind speed related to the mirror structure of the light collecting device arranged inside. Smaller than wind load. For this reason, in the said heat collecting equipment, regarding the wind blowing in the region, the wind load on the mirror structure of the light collecting device arranged on the outer edge side of the same region and the light collecting device arranged inside the same region The difference between the wind load on the mirror structure and the wind load on the mirror structure of the light concentrator arranged on the inner side is sometimes reduced. It is also possible to make it equal to or smaller than the load. In other words, in the said heat collection equipment, the wind load with respect to the mirror structure of each condensing device arrange | positioned in the area | region is equalized regarding the wind blowing in an area | region.

  Therefore, in the heat collecting equipment, the support structure of the light collecting device in the region and the foundation thereof are the same as the specification of the support structure of the light collecting device arranged on the outer edge side and the foundation. However, the support structure of the light collecting device arranged inside and the foundation thereof do not become over-spec in strength.

  Therefore, according to the said heat collection equipment, the installation cost total of all the condensing apparatuses arrange | positioned in the area | region can be suppressed.

  By the way, when the area of the reflecting surface of the mirror is the same, the size of the condensing diameter by the mirror increases as the distance between the condensing device and the condensing position increases. For this reason, basically, the condensing diameter by the mirror of the condensing device arranged on the outer edge side is relatively large, and the condensing accuracy is relatively low. Here, the light collection accuracy means the extent of the light collection distribution on the light collection surface, and is generally a value represented by the standard deviation σ of the light collection distribution. However, in the heat collecting equipment, the area of the reflecting surface in the mirror of the light collecting device arranged on the outer edge side is smaller than the area of the reflecting surface in the mirror of the light collecting device arranged inside the region, The condensing diameter by the mirror of the condensing device arrange | positioned at the outer edge side can be made small, and condensing precision can be made high.

  Here, in the heat collection facility, the support structures of the plurality of light collecting devices arranged in the region may be the same.

  In the heat collecting equipment, even if a plurality of types of heat collecting devices having different reflective surface areas are manufactured, since the support structures are the same, an increase in the number of parts can be suppressed. The total manufacturing cost of all the concentrating devices arranged can be suppressed.

  Further, the heat collection facility may include a heat receiver that heats the medium with sunlight collected by any of the plurality of light collecting devices in the region.

  In the heat collecting facility, the region may have a donut shape, a fan shape, or a square shape in plan view.

  In the present invention, the equipment cost in the heat collecting equipment can be suppressed.

It is explanatory drawing which shows the structure of the heat collecting equipment in one Embodiment which concerns on this invention. It is a top view of the heat collection equipment in one embodiment concerning the present invention. It is a perspective view of the heliostat in one embodiment concerning the present invention. It is a figure which shows the mirror structure in one Embodiment which concerns on this invention, The figure (a) is a rear view of a mirror structure, The figure (b) is a bottom view of a mirror structure. It is a rear view of the mirror structure in the heliostat arrange | positioned in the outer edge side of the heliostat installation area | region in one Embodiment which concerns on this invention, and the mirror structure in the heliostat arrange | positioned inside. It is a principal part side view of the heat collecting equipment in one embodiment concerning the present invention. It is a rear view of the mirror structure in the heliostat arrange | positioned in the outer edge side of the heliostat installation area | region in the 1st modification of one Embodiment which concerns on this invention, and the mirror structure in the heliostat arrange | positioned inside. . It is a rear view of the mirror structure in the heliostat arrange | positioned in the outer edge side of the heliostat installation area | region in the 2nd modification of one Embodiment which concerns on this invention, and the mirror structure in the heliostat arrange | positioned inside. . It is explanatory drawing which shows the various modifications of the heliostat installation area | region of one Embodiment which concerns on this invention, The figure (A) shows the heliostat installation area | region of a 1st modification, The figure (B) is a 2nd modification. The heliostat installation area is shown.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a heat collection facility including a light collecting device according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the heat collection facility 1 of the present embodiment reflects sunlight with a heat receiver 10 to which sunlight is irradiated, a tower facility 20 to which the heat receiver 10 is fixed, and a mirror. The heat receiving device 10 is provided with a plurality of heliostats 30 as a light collecting device that irradiates sunlight, and a control device 2 that controls the plurality of heliostats 30.

  The heat receiver 10 includes a heat receiving portion 11 that is irradiated with sunlight, and a casing 12 that covers the heat receiving portion 11. A working fluid such as water or air is supplied into the heat receiving unit 11, and the working fluid is heated by heat from sunlight. When the working fluid is air, the heat collection facility 1 further includes a gas turbine that is driven by heated air and a generator that generates electric power by driving the gas turbine, thereby constituting a solar thermal power generation facility. be able to. In addition, when the working fluid is water, the heat collecting facility further includes a steam turbine driven by steam generated by heating water and a generator driven by the steam turbine to constitute the solar power generating facility. be able to. In this example, the heat energy from the heat receiver 10 is used for generating electric energy, but this heat energy may be used for generating steam.

  As shown in FIG. 2, a plurality of heliostats 30 are scattered in the donut-shaped heliostat installation region R with the tower facility 20 as the center. In other words, a plurality of heliostats 30 are arranged 360 ° in the circumferential direction around the tower facility 20, and a plurality of heliostats 30 are also arranged in the perspective direction with the tower facility 20 as a reference.

  As shown in FIG. 3, the heliostat 30 includes a mirror structure 31 having a mirror 32 that reflects sunlight, a driving device 40 that directs the mirror 32 of the mirror structure 31 in a target direction, and a support that supports these. And a stand 50. In the present embodiment, the support structure includes the driving device 40 and the support base 50. In the present embodiment, as will be described in detail later, the driving device 40 rotates the mirror structure 31 around each of the first rotation axis A1 and the second rotation axis A2 orthogonal to each other. It is.

  The mirror structure 31 includes two mirrors 32, a back reinforcing plate 33 bonded to the back of each mirror 32, and a support frame 35 that supports the back of the back reinforcing plate 33.

  As shown in FIG. 4, the two mirrors 32 have the same size and the same rectangular plate shape. In the mirror structure 31 of this embodiment, the reflecting surfaces of the two mirrors 32 form one rotationally symmetric surface, specifically, a paraboloid of revolution. The top of this paraboloid is located at the midpoint between the two mirrors 32. Hereinafter, in this embodiment, the vertex of the paraboloid of revolution is the principal point Q1 of the mirror structure 31, and the axis extending through the principal point Q1 in the normal direction to the reflecting surface, that is, rotational symmetry of the rotationally symmetric surface. The axis is the optical axis Ao of the mirror structure 31.

  As described above, the back reinforcing plate 33 is bonded to the entire back surface of the two mirrors 32. The back reinforcing plate 33 is formed of a thin steel plate, a thin aluminum alloy plate, a resin plate, or the like, and is formed so as to have an uneven shape in the plate thickness direction. The back reinforcing plate 33 is bonded to the back surface of the mirror 32 via an adhesive at the top of the convex portion of the concavo-convex shape. On the other hand, a support frame 35 is joined to a portion of the back reinforcing plate 33 that is recessed relative to the convex portion by welding or adhesion. In addition to the above, the back reinforcing plate 33 may be, for example, a honeycomb structure plate.

  The support frame 35 includes a plurality of support beam members 36 and a connecting member 37 that connects the plurality of support beam members 36 to each other. The cross section of the support beam member 36 has a groove shape or a square pipe shape. The plurality of support beam members 36 are joined to the back reinforcing plate 33 such that the longitudinal direction thereof faces the radial direction from the optical axis Ao of the mirror structure 31. Specifically, in this embodiment, two support beam members 36 are provided for one back reinforcing plate 33. One end portion of each support beam member 36 faces the optical axis Ao side, and the other end portion faces the corner side of the back reinforcing plate 33, that is, the corner side of the mirror 32. The back reinforcing plate 33 is provided so as to form a letter. Here, although two support beam members 36 are provided for one back reinforcing plate 33, that is, one mirror 32, three or more support beam members 36 may be provided from the viewpoint of strength.

  The connecting member 37 includes a connecting beam 38 that connects the two support beam members 36 of one back reinforcing plate 33, a connecting beam 38 on the one back reinforcing plate 33 side, and a connection on the other back reinforcing plate 33 side. A columnar shaft 46 that connects the beam 38 and a T-shaped tube 47 through which the shaft 46 is inserted are provided.

  As shown in FIG. 3, the central axis of the shaft 46 that connects the connecting beams 38 passes through the principal point Q <b> 1 that is orthogonal to the optical axis Ao and that is the apex of the paraboloid of the mirror structure 31. The shaft 46 enters a portion corresponding to a horizontal line of the T-shaped tube 47 and is supported by a bearing provided inside the T-shaped tube 47 so as to be rotatable about its own central axis. In the present embodiment, the shaft 46 forms a second rotation axis, and the central axis of the shaft 46 forms a second rotation axis A2. Therefore, hereinafter, this shaft 46 is referred to as a second rotating shaft 46. In the present embodiment, the first rotation axis A1 orthogonal to the second rotation axis A2 also passes through the principal point Q1, which is the apex of the paraboloid of the mirror structure 31, like the second rotation axis A2.

  The driving device 40 includes a first drive unit 41 that rotates each mirror 32 about the first rotation axis A1, a second drive unit 45 that rotates each mirror 32 about the second rotation axis A2, and a first drive unit 40 with respect to the horizontal plane. And an elevation angle changing unit 49 that changes the angle of one rotation axis A1.

  The second drive unit 45 includes the above-described second rotation shaft 46 having the second rotation axis A2 as the central axis, and a second drive mechanism 48 that rotates each mirror 32 around the second rotation axis A2. ing.

  The first drive unit 41 rotates the mirror 32 around the first rotation axis A1 with the first rotation shaft 42 having the first rotation axis A1 orthogonal to the second rotation axis A2 and passing through the principal point Q1 as the central axis. And a first drive mechanism 44 to be moved.

  The first rotating shaft 42 has a columnar first rotating shaft main body 43 with the first rotating axis A1 as a central axis, and a T-shaped tube 47 that is a part of the connecting member 37 in the mirror structure 31. . As described above, the second rotary shaft 46 enters the portion corresponding to the horizontal line of the T-shaped tube 47, and can be rotated around the second rotational axis A2 by the bearing provided inside the T-shaped tube 47. It is supported by. In addition, one end of the first rotary shaft main body 43 is connected to a portion corresponding to the vertical line of the T-shaped tube 47 by, for example, fitting or the like, and the first rotary shaft main body 43 is fixed. In other words, the T-shaped tube 47 plays a role as a shaft connecting member that connects the second rotating shaft 46 and the first rotating shaft main body 43.

  As described above, in this embodiment, the shaft (second rotation shaft) 46 and the T-shaped tube 47 of the connecting member 37, which are constituent elements of the mirror structure 31, are also constituent elements of the driving device 40.

  The first drive mechanism 44 has, for example, a linear motion actuator. The operating end of the linear motion rod of this linear motion actuator is connected to the first rotating shaft 42 via a link mechanism, for example. Note that the first drive mechanism 44 does not use the linear actuator as a drive source as described above, but may use a motor having a rotation output shaft as a drive source.

  Further, the second drive mechanism 48 has, for example, a linear actuator. The operating end of the linear motion rod of this linear motion actuator is pin-connected to the back surface of the mirror structure 31 that can rotate around the second rotational axis A2, for example. The second drive mechanism 48 is not limited to the linear motion actuator as a drive source as described above, but may be a motor having a rotation output shaft as a drive source. Moreover, you may provide the orthogonal two-axis integrated reduction gear which rotates each of the 1st rotating shaft 42 and the 2nd rotating shaft 46. As shown in FIG.

  The elevation angle changing unit 49 may be anything as long as it can change the angle of the first rotation axis A1 with respect to the support base 50, for example, a turnbuckle. The turnbuckle has a fuselage frame in which female screws are formed at both ends, and a screw rod that is screwed into each end of the fuselage frame. In this case, the end of one screw rod of the turnbuckle is pin-connected to the first rotating shaft 42, and the end of the other screw rod of the turnbuckle is pin-connected to the support base 50. . When the fuselage frame of the turnbuckle is rotated, the distance between the screw rods changes. When the distance between the screw rods changes, the distance between the pin connection position of the first rotating shaft 42 and the pin connection position of the support base 50 changes. As a result, the angle of the first rotation shaft 42 with respect to the horizontal plane changes.

  Here, a turnbuckle is used for the elevation angle changing unit 49 that changes the angle of the first rotating shaft 42 with respect to the support base 50. Instead, for example, a linear actuator or a rotary motion is converted into a linear motion. You may use what has a rack and pinion mechanism and the rotation motor which rotates the pinion of this mechanism. Further, a fixing plate may be used for the purpose of simplifying the structure.

  By the way, in this embodiment, as shown in FIG. 2, the heliostat 30o arrange | positioned in the outer edge side in this heliostat installation area | region R among several heliostats installed in the heliostat installation area | region R. And the heliostat 30i disposed inside the heliostat installation region R is slightly different.

  Specifically, as shown in FIG. 6, the area in the rear view of the mirror structure 31o of the heliostat 30o arranged on the outer edge side is the rear view of the mirror structure 31i of the heliostat 30i arranged on the inner side. Smaller than the area. For this reason, as shown in FIG. 5, the area of the reflecting surface of the mirror 32o in the mirror structure 31o of the heliostat 30o arranged on the outer edge side is also the same in the mirror structure 31i of the heliostat 30i arranged on the inner side. It is smaller than the area of the reflecting surface of the mirror 32i. Similarly, the area of the back reinforcing plate 33o in the mirror structure 31o of the heliostat 30o arranged on the outer edge side is also larger than the area of the back reinforcing plate 33i in the mirror structure 31i of the heliostat 30i arranged on the inner side. small. Further, the length of the support beam member 36o of the support frame 35o in the mirror structure 31o of the heliostat 30o disposed on the outer edge side is also the support of the support frame 35i in the mirror structure 31i of the heliostat 30i disposed on the inner side. It is shorter than the length of the beam member 36i.

  The connecting member 37 of the support frame 35o in the mirror structure 31o of the heliostat 30o arranged on the outer edge side is connected to the connecting member 37 of the support frame 35i in the mirror structure 31i of the heliostat 30i arranged on the inner side. Are the same. Further, the driving device 40 and the support base 50 of the heliostat 30o arranged on the outer edge side are the same as the driving device 40 and the support base 50 of the heliostat 30i arranged on the inner side.

  In this embodiment, the heliostat 30o on the outer edge side having a small area of the mirror structure 31o is arranged on the outermost edge side in the heliostat installation region R, and then on the outer edge side. The heliostat arranged inside is a heliostat 30i inside the mirror structure 31i.

  If a plurality of heliostats having the same shape and the same size mirror structure are disposed in a region, the heliostat mirror disposed on the outer edge side of the region with respect to the wind blowing in this region. The wind load on the structure is larger than the wind load on the mirror structure of the heliostat arranged inside the region. This is because the mirror structure of the heliostat arranged on the outer edge directly receives wind from outside the region, whereas the mirror structure of the heliostat arranged on the inner side is arranged on the outer edge side. This is because the wind speed is reduced by the mirror structure of the heliostat.

  Therefore, in the above case, all heliostats in the region depend on the specifications of the heliostat arranged on the outer edge side where the wind load on the mirror structure is large, and are arranged inside the small wind load on the mirror structure. It becomes overspec for the heliostat. Specifically, all heliostat mirror structures in the region, the driving device, the support base, and the foundation thereof are arranged on the outer edge side where the wind load on the mirror structure is large, the heliostat mirror structure, drive It becomes the same as the specs of the device, the support base, and the foundation thereof, and the heliostat drive device, the support base, and the base disposed on the inner side where the wind load on the mirror structure is small is over-spec in terms of strength.

  Therefore, in the above case, a large number of over-specific heliostats are installed, which increases the total installation cost.

  On the other hand, in the present embodiment, as described above with reference to FIG. 6, the area of the mirror structure 31o of the heliostat 30o disposed on the outer edge side of the heliostat installation region R is the heliostat disposed on the inner side. It is smaller than the area of the mirror structure 31i of 30i. That is, in this embodiment, the wind load with respect to the wind of a predetermined wind speed related to the mirror structure of the heliostat arranged on the outer edge side is equal to the wind against the wind of the same predetermined wind speed related to the mirror structure of the heliostat arranged inside. Less than the load. For this reason, in the present embodiment, with respect to the wind W blowing in the heliostat installation region R, the wind load on the mirror structure 31o of the heliostat 30o arranged on the outer edge side of the region R and the inside of the region R are arranged. The difference between the heliostat 30i and the wind load on the mirror structure 31i is reduced, and in some cases, the wind load on the mirror structure 31o of the heliostat 30o disposed on the outer edge side is disposed on the inner side. It is also possible to make it equal to or smaller than the wind load on the mirror structure 31i of the light collecting device 30i. In other words, in the heat collecting facility 1 of the present embodiment, the wind load on the mirror structures 31o and 31i of the heliostats 30o and 30i arranged in the heliostat installation region R is related to the wind W in the heliostat installation region R. Equalize.

  Therefore, in the present embodiment, the drive devices 40 and the support bases 50 of all the heliostats 30o and 30i in the heliostat installation region R, and the drive devices 40 of the heliostat 30o whose foundations are arranged on the outer edge side, Even if the specifications of the support base 50 and the foundation thereof are the same, the driving device 40 of the heliostat 30i disposed inside, the support base 50, and the foundation thereof do not become over-spec in terms of strength.

  Therefore, in this embodiment, the installation cost total of several heliostats 30o and 30i can be suppressed. For this reason, in this embodiment, the initial cost of the heat collecting equipment 1 provided with the some heliostats 30o and 30i, ie, equipment cost, can be held down.

  By the way, when the area of the reflecting surface of the mirror 32 is the same, the size of the condensing diameter by the mirror 32 increases as the distance between the heliostat 30 and its condensing position increases. For this reason, basically, the condensing diameter by the mirror of the heliostat arranged on the outer edge side is relatively large, and the condensing accuracy is relatively low. Here, the light collection accuracy means the extent of the light collection distribution on the light collection surface, and is generally a value represented by the standard deviation σ of the light collection distribution. However, in the heat collecting facility 1 of the present embodiment, the area of the reflecting surface in the mirror 32 of the heliostat 30o arranged on the outer edge side is larger than the area of the reflecting surface in the mirror 32 of the heliostat 30i arranged on the inner side. small. For this reason, in the heat collecting equipment 1 of this embodiment, the condensing diameter by the mirror 32 of the heliostat 30o arrange | positioned at the outer edge side can be made small, and condensing precision can be made high.

  In the present embodiment, as described above, the heliostat 30o on the outer edge side with the small area of the mirror structure 31o is the heliostat arranged on the outermost edge side in the heliostat installation region R, and then the outer heliostat. It is a heliostat arranged on the edge side. However, the heliostat 30o on the outer edge side with the small area of the mirror structure 31o is the most in the heliostat installation area R depending on the density of the heliostat in the heliostat installation area R and the area of the mirror structure of the heliostat. A heliostat arranged on the outer edge side, a heliostat arranged next to the outer edge side, and a heliostat arranged next to the outer side may be used. Only the heliostat being used may be used.

  In this embodiment, two types of mirror structures are used as the mirror structures having different wind loads for the wind at the same wind speed. However, the heliostat installation area R is relatively wide, and the heliostats installed in this area. When the number of stats is relatively large, three or more types of mirror structures may be used as mirror structures having different wind loads for the same wind speed.

`` Modification example of mirror structure ''
Next, various modified examples of the mirror structure in the heliostat arranged on the outer edge side of the heliostat installation area will be described with reference to FIGS.

  First, a first modification of the mirror structure of the heliostat disposed on the outer edge side of the heliostat installation region R will be described with reference to FIG.

  In the present modification, the mirror 32o and the back reinforcing plate 33o in the mirror structure 31oa of the heliostat arranged on the outer edge side of the heliostat installation region R are the same as those in the above embodiment. The mirror structure 31i is smaller than the mirror 32i and the back reinforcing plate 33i. However, in this modification, the support frame 35i in the mirror structure 31oa of the heliostat arranged on the outer edge side of the heliostat installation region R is different from the above embodiment in that the mirror structure of the heliostat arranged on the inner side. It is the same as the support frame 35i in the body 31i. That is, the support beam member 36i of the support frame 35i in the mirror structure 31oa of the heliostat arranged on the outer edge side of the heliostat installation region R is the support frame 35i in the mirror structure 31i of the heliostat arranged inside. It is the same length as the support beam member 36i.

  The mirror 32o and the back reinforcing plate 33o in the heliostat mirror structure 31oa arranged on the outer edge side of the heliostat installation region R are replaced with the mirror 32i and the back reinforcing plate in the heliostat mirror structure 31i arranged inside. If the reduction ratio is not too small, in other words, if the reduction ratio is relatively large, there is no problem even if the support frame 35i is shared between the inner and outer heliostats.

  Therefore, in this variation, in the above case, the support frame 35i is shared between the internal and external heliostats, and the total number of equipment costs is further reduced by reducing the number of parts when multiple types of heliostats are created. Yes.

  Next, a second modification of the mirror structure of the heliostat disposed on the outer edge side of the heliostat installation region R will be described with reference to FIG.

  In this modification, the mirror 32ob and the back reinforcing plate 33ob in the mirror structure 31ob of the heliostat arranged on the outer edge side of the heliostat installation region R are arranged on the inner side in the same manner as in the above embodiment and the first modification. The mirror structure 31i of the heliostat is smaller than the mirror 32i and the rear reinforcing plate 33i. However, in this modification, the mirror 32ob and the back reinforcing plate 33ob in the mirror structure 31ob of the heliostat arranged on the outer edge side of the heliostat installation region R are different from the above embodiment and the first modification inward. This is different from the shape of the mirror 32i and the back reinforcing plate 33i in the mirror structure 31i of the arranged heliostat.

  The mirror 32i and the back reinforcing plate 33i in the mirror structure 31i of the heliostat disposed inside the heliostat installation region R have a square shape in the back or plan view, as in the above embodiment and the first modification. ing. On the other hand, the mirror 32ob and the back reinforcing plate 33ob in the mirror structure 31ob of the heliostat arranged on the outer edge side of the heliostat installation region R are substantially square in the back or plan view, but the two supports of the support frame 35i. The corners on each extension line of the beam member 36i are curved.

  Thus, in the present invention, the wind load with respect to the wind of the predetermined wind speed related to the mirror structure of the heliostat arranged on the outer edge side is applied to the wind of the predetermined wind speed related to the mirror structure of the heliostat arranged inside. If it is smaller than the wind load, the rear or front view shape of the mirror structures 31ob, 31i of the inner and outer heliostats may be different.

  In this modification, two corners of the mirror 32ob and the back reinforcing plate 33ob in the mirror structure 31ob of the heliostat arranged on the outer edge side of the heliostat installation region R are formed by curves. However, conversely, the two corners of the mirror and the back reinforcing plate in the mirror structure of the heliostat arranged inside the heliostat installation region R are formed by curves and arranged on the outer edge side of the heliostat installation region R. The mirror and the back reinforcing plate in the mirror structure of the heliostat may be formed in a square shape as in the above embodiment and the first modification.

"Modification of heliostat installation area"
Next, various modifications of the heliostat installation area will be described with reference to FIG.

  The heliostat installation area in the embodiment and each of the modifications is a donut-shaped heliostat installation area R in plan view with the tower facility 20 as the center. However, in the present invention, the shape of the heliostat installation area may be any shape. For example, as shown in FIG. 9A, even if the heliostat installation area Ra has a fan shape in plan view, As shown to (B), square heliostat installation area | region Rb may be sufficient by planar view. In the case of the fan-shaped heliostat installation region Ra shown in FIG. 4A, the heat receiver 10a is basically arranged at the position of the fan. However, the position of the heat receiver 10a may not be arranged at the position of the main part of the fan.

  Also in the above modification, the wind load with respect to the wind of the predetermined wind speed regarding the mirror structure of the heliostat arranged on the outer edge side Roa, Rob of the heliostat installation region Ra, Rb is arranged on the inner side Ria, Rib. It is set smaller than the wind load with respect to the wind of this predetermined wind speed concerning the mirror structure of the heliostat. In other words, also in the above modification, the area of the reflecting surface of the mirror in the heliostat arranged on the outer edge side Roa, Rob of the heliostat installation region Ra, Rb is the heliostat arranged on the inner side Ria, Rib. Is smaller than the area of the reflecting surface of the mirror.

"Other variations"
The mirror structures of the above embodiment and each modification have two mirrors, but the present invention is not limited to this, and may have only one mirror. It may have three or more mirrors. Furthermore, the shape of the mirror is not limited to a square, and may be, for example, a fan shape including a semicircle.

  In the present embodiment, the first rotation axis A1 and the second rotation axis A2 are orthogonal to each other, and the principal point Q1 of the mirror structure 31 is located on the intersection of the first rotation axis A1 and the second rotation axis A2. doing. However, the first drive unit that rotates the mirror about the first rotation axis A1 and the second drive unit that rotates the mirror about the second rotation axis A2 that is perpendicular to the first rotation axis. Any type of driving device may be used as long as it is present, for example, a graduation table type driving device may be used.

  A1 ... first rotation axis, A2 ... second rotation axis, R, Ra, Rb ... heliostat installation area, 1 ... heat collecting equipment, 2 ... control device, 10 ... heat receiver, 11 ... heat receiving section, 20 ... tower facility , 30, 30i, 30o ... heliostat (light collecting device), 31, 31i, 31o, 31oa, 31ob ... mirror structure, 32, 32i, 32o, 32ob ... mirror, 33, 33i, 33o, 33ob ... back reinforcing plate , 35, 35i, 35o ... support frame, 36, 36i, 36o ... support beam member, 37 ... coupling member, 40 ... drive device, 41 ... first drive unit, 42 ... first rotating shaft, 44 ... first drive mechanism 45 ... second drive unit, 46 ... second rotary shaft, 48 ... second drive mechanism, 49 ... elevation angle changing unit, 50 ... support base

Claims (6)

A plurality of concentrating devices that are arranged in the region and condense sunlight toward a target condensing position;
The plurality of light collecting devices each include a mirror structure having a mirror that reflects and collects sunlight, and a support structure that supports the mirror structure.
Of the plurality of light collecting devices arranged in the region, the area of the reflecting surface of the mirror of the light collecting device arranged on the outer edge side in the region is arranged inside the region. Smaller than the area of the reflecting surface in the mirror of the light collecting device,
A heat collection facility characterized by that. The heat collecting facility according to claim 1,
The support structures of the plurality of concentrating devices arranged in the region are identical to each other;
A heat collection facility characterized by that. In the heat collection facility according to claim 1 or 2,
Comprising a heat receiver that heats the medium with sunlight collected by any of the plurality of light concentrators in the region;
A heat collection facility characterized by that. In the heat collection facility according to any one of claims 1 to 3,
The region has a donut shape in plan view.
A heat collection facility characterized by that. In the heat collection facility according to any one of claims 1 to 3,
The region has a fan shape in plan view.
A heat collection facility characterized by that. In the heat collection facility according to any one of claims 1 to 3,
The region has a square shape in plan view.
A heat collection facility characterized by that.

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