WO2016121016A1 - Solar light collecting device, controlling device for same, and solar light reflector control method - Google Patents

Abstract

The purpose of the present invention is to ascertain solar light reflective properties of a heliostat caused by dirt, scratches, or distortion of a mirror over time. The present invention pertains to measuring solar reflective properties of the heliostat by exposing a measuring mechanism to light reflected from one of a plurality of heliostats. By virtue of the present invention, the solar reflective properties of each of the plurality of heliostats can be ascertained.

Description

Sunlight concentrator, its control device, and solar reflector control method

The present invention relates to a solar light collecting device that collects sunlight on a light receiver by a heliostat and uses energy generated by the reflected light.

A heliostat is a device that reflects sunlight. A large number of heliostats provided in the solar light collecting device are controlled so as to collect reflected light on a light receiver in accordance with the orbit of the sun. As an example, about 100 to 10,000 heliostats are provided in the solar concentrator. However, not all of these heliostats are used, but light is received depending on the position of the sun that changes from moment to moment, process requirements, etc. Only the heliostat necessary to obtain an appropriate heat input below the heat resistance temperature of the vessel is used.

For example, in Japanese Patent Laid-Open No. 2013-96636 (Patent Document 1), a selection pattern that is a combination of ON / OFF of a plurality of heliostats is obtained based on weather information, and a plurality of heliostats are determined according to the obtained selection pattern. ON / OFF control is performed.

JP 2013-96636 A

The inventor of the present application diligently studied the continuous control of the heliostat in the solar light collecting device, and as a result, the following knowledge was obtained.

In Patent Document 1, ON / OFF control of a plurality of heliostats is based on the assumption that uniform reflected light is irradiated onto a light receiver assuming an ideal mirror. In practice, however, mirror stains, scratches, and distortions over time can occur. For this reason, the mirror on the heliostat is not always ideal. In other words, in reality, the sunlight reflection characteristics of each heliostat, and hence the light collection distribution on the light receiver, are different. Therefore, in actuality, there is a possibility that positional non-uniformity of light collection may occur in the distribution of the total reflected light (hereinafter referred to as an integrated light collection distribution) irradiated to the light receiver, and as a result, the heat on the light receiver. May cause unevenness.

An object of the present invention relates to grasping the sunlight reflection characteristics of a heliostat due to dirt, scratches or distortion of a mirror over time.

The present invention relates to irradiating a measurement mechanism with reflected light from a part of a plurality of heliostats and measuring sunlight reflection characteristics of the heliostat.

According to the present invention, it is possible to grasp the sunlight reflection characteristics of a plurality of heliostats.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the sunlight condensing device concerning Example 1. FIG. The measurement flowchart figure of the sunlight condensing distribution of each heliostat concerning Example 2. FIG. The figure explaining the change of the light quantity distribution on a screen by the position of the sun concerning Example 2. FIG. The flowchart of selection of the heliostat which irradiates reflected light to a heat receiver, and the determination of a condensing coordinate correction value concerning Example 3. FIG. FIG. 10 is a diagram illustrating a method for obtaining an integrated light distribution according to the third embodiment. The flowchart figure which shows the maintenance determination method of the reflective mirror of a heliostat concerning Example 4. FIG. Explanatory drawing which shows the change of the sunlight reflective characteristic of each heliostat concerning Example 4. FIG. Explanatory drawing which shows the method concerning the Example 5 which estimates the cleaning time of a reflective mirror. Explanatory drawing which shows the method concerning the Example 5 which estimates the replacement | exchange time of a reflecting mirror. Explanatory drawing which shows the method concerning Example 5 which estimates the readjustment time of the surface of a reflective mirror. The schematic of the sunlight condensing device provided with the heliostat for wind protection concerning Example 6. FIG. The support structure figure of the reflective mirror concerning Example 7. FIG. FIG. 10 is a schematic view of vibration of the reflecting mirror caused by wind according to the seventh embodiment. The schematic of the lift generating member of a reflective mirror concerning Example 7. FIG. The block diagram of the lift generation member about the some reflective mirror concerning Example 7. FIG. FIG. 10 is another configuration diagram of a lift generating member for a plurality of reflecting mirrors according to Example 7; The block diagram of the reflective mirror which has a curvature concerning Example 7. FIG. The block diagram of the reflective mirror which has a convex part on the reflective mirror surface concerning Example 7. FIG. The block diagram of the reflective mirror concerning Example 7 which bent the edge part.

In an embodiment, a light receiver that receives the irradiated light, a plurality of heliostats that reflect sunlight and irradiate the light receiver with the reflected light, and a plurality of heliostats are controlled to reflect from the heliostat. A sunlight collecting apparatus comprising: a control device that controls light; and a measurement mechanism that is irradiated with reflected light from a part of the plurality of heliostats and that measures the sunlight reflection characteristics of the heliostat based on the reflected light. An optical device is disclosed.

Also, in the embodiment, it is disclosed that the control of the reflected light from the heliostat by the control device is performed based on the sunlight reflection characteristics of the heliostat or the heat distribution of the light receiver obtained from the sunlight reflection characteristics.

Also, in the embodiment, it is disclosed that the control device controls the heliostat so that the heat distribution on the light receiver is equal to or lower than the heat resistant temperature of the light receiver.

Also, in the embodiment, it is disclosed that the measurement mechanism includes a reflected light receiver that receives the reflected light from the heliostat and a light amount acquisition unit that acquires a light amount distribution of the reflected light receiver.

Also, in the embodiment, it is disclosed that the measurement of the sunlight reflection characteristic of the heliostat by the measurement mechanism is performed when the state of the heliostat satisfies a predetermined condition.

Further, in the embodiment, the measurement of the solar reflection characteristics of the heliostat by the measurement mechanism is based on the fact that at least one of the operating time of the solar concentrator and the integrated value of the received light amount or the calorific value of the light receiver satisfies a predetermined condition. Disclose what happens when you meet.

Further, in the embodiment, the solar light collecting device includes a storage unit that stores the measurement result of the solar reflection characteristic of the heliostat, and the solar reflection characteristic of each heliostat is measured at a certain period by the measurement mechanism. It is disclosed that the control unit determines the maintenance time of each heliostat by comparatively analyzing the sunlight reflection characteristics for a plurality of periods stored in the storage unit.

In the embodiment, the control unit analyzes the solar reflection characteristics for a plurality of periods, analyzes at least one of dirt, scratches, and distortion of each heliostat, and determines the maintenance time of each heliostat. Disclose judgment.

Further, in the embodiment, the solar light collecting control device for controlling the heliostat in the solar light collecting device for collecting the reflected light from the plurality of heliostats on the light receiver, the reflection irradiated from the heliostat Disclosed is a measurement mechanism that measures the sunlight reflection characteristics of the heliostat based on light, and a storage unit that stores the sunlight reflection characteristics measured by the measurement mechanism.

In the embodiment, the control of the heliostat calculates the heat amount distribution of the light receiver from the solar reflection characteristics of the heliostat stored in the storage unit, and the heat amount distribution of the light receiver is equal to or lower than the heat resistant temperature of the light receiver. It is disclosed that this is done.

In the embodiment, it is disclosed that the measurement unit includes a reflected light receiver that receives the reflected light from the heliostat and a light amount acquisition unit that acquires a light amount distribution of the reflected light receiver.

In the embodiment, each heliostat is measured by measuring the solar light reflection characteristics of each heliostat at regular intervals by the measurement mechanism, and comparing and analyzing the solar light reflection characteristics for a plurality of periods stored in the storage unit. Disclosure of judging the maintenance time of

Moreover, in an Example, it controls so that the reflected light from some solar reflectors may be irradiated to the measurement part which measures the solar reflective property of a solar reflector, and the said solar reflective property Disclosed is a method for controlling a plurality of solar reflectors for measuring the light intensity.

Also, in the embodiment, it is disclosed that the solar reflector is controlled so that the heat distribution of the light receiver is equal to or lower than the heat resistant temperature of the light receiver.

Also, in the embodiment, it is disclosed that the solar reflection characteristics of the solar reflector are measured at regular intervals, and the maintenance time of the solar reflector is determined from the change in the measurement result of the solar reflection characteristics.

Further, in the embodiment, a light receiving device that receives the irradiated light, a plurality of heliostats that reflect sunlight and irradiates the reflected light to the light receiving device, and a plurality of heliostats by controlling the plurality of heliostats. Disclosed is a solar condensing device that includes a control device that controls the reflected light and a wind speed sensor that can detect the wind speed, and uses at least a part of a plurality of heliostats for wind protection when the wind speed is constant. To do.

Also, in the embodiment, it is disclosed that the heliostat used for wind protection is controlled so that the reflecting mirror is at a predetermined angle with respect to the wind direction.

Further, in the embodiment, a light receiving device that receives the irradiated light, a plurality of heliostats that reflect sunlight and irradiates the reflected light to the light receiving device, and a plurality of heliostats by controlling the plurality of heliostats. A control device that controls the reflected light and a wind speed sensor that can detect the wind speed. When the wind speed is constant, at least a part of the multiple heliostats is used to avoid damage to the heliostat due to wind. The sunlight condensing device which is set as the standby mode is disclosed.

Also, in the embodiment, it is disclosed that the heliostat in the standby mode is controlled so that the reflecting mirror is in a substantially horizontal position.

Also, in the embodiments, a heliostat including a reflecting mirror that reflects sunlight, a support leg that supports the reflecting mirror, and a lift generating member that suppresses vibration of the reflecting mirror is disclosed.

In the embodiment, it is disclosed that the lift generating member is provided on at least a part of the outer peripheral portion of the reflecting mirror.

The above and other novel features and effects of the present invention will be described below with reference to the drawings. The drawings are used for understanding the invention and do not limit the scope of rights.

FIG. 1 is a schematic configuration diagram of a solar light collecting apparatus according to the present embodiment. In this embodiment, solar thermal power generation is performed using the energy of the collected reflected light. However, this energy may be used for steam generation or as a heating source in a chemical plant.

The solar light collecting apparatus according to the present embodiment includes a tower portion irradiated with reflected light, a light collecting portion that reflects sunlight to the tower portion, and a power generation portion that generates electric power using the energy of the reflected light.

The tower section has the tower 102 as a base, and a light receiver 101 to which the reflected sunlight is irradiated is fixed on the tower section. In addition, a screen 110 for measuring sunlight reflection characteristics of each heliostat is provided in the middle of the tower 102. A camera 111 that acquires light quantity distribution information on the screen 110 is disposed at a position opposite to the screen 110.

The light collecting unit detects a plurality of heliostats 103 (for example, 100 to 10000) that reflect sunlight and collects the light in a light receiver, and a light amount directly irradiated from the sun (hereinafter referred to as direct solar radiation amount). And a heliostat control device 105 for individually controlling the heliostat.

The heliostat 103 includes a reflecting mirror 119 that reflects sunlight, a support leg 121 that supports the reflecting mirror 119, and a reflecting mirror driver 120 that directs the reflecting mirror 119 in a target direction.

In addition, the heliostat control device 105 includes a CPU unit 106 that is operated by a program, an input unit 107 that receives instructions from an operator, a display unit 108 that displays various types of information, and a recording medium 109 that stores data. I have. The heliostat control device 105 receives a command value for the received light amount of the light receiver 101 and a command value for the power generation amount of the solar thermal power plant from the control device 115 of the power generation unit corresponding to the host device. Further, a direct solar radiation amount signal is received from the direct solar radiation meter 112. Then, based on these signals, the reflecting mirror driver 120 is controlled to control the direction of reflected light from the heliostat 103.

The power generation unit is connected to the steam turbine 118 for generating power by supplying water or steam into the power generation unit and the piping 117 for circulation, the steam turbine 118 driven by steam vaporized by the heat of the light receiver 101, and generating power. A generator (not shown) and a cooling facility 113 that cools the steam discharged from the steam turbine 118 and returns it to water. In addition, the power generation unit includes a power generation unit control device 115 that controls the power generation unit.

During power generation by the power generation unit, not all heliostats are always used, but necessary heliostats are selected and used in order to obtain an appropriate amount of heat input. Here, “use of a heliostat” means that the direction of the reflected light from the heliostat is controlled by the heliostat control device 105 so that the reflected light is irradiated to the light receiver 101.

One of the heliostats that have not been selected is controlled by the heliostat control device 105 so as to irradiate the screen 110 with reflected light instead of the light receiver 101. By this control, reflected light from only one heliostat is irradiated on the screen 110. For this reason, the sunlight reflection characteristic of only one heliostat can be calculated from the distribution of the amount of light on the screen 110.

In this embodiment, the light quantity distribution generated on the screen 110 by one of the heliostats not selected by the camera 111 facing the screen 110 is acquired as an image. Information on the light amount distribution is transmitted to the CPU 106. The CPU 106 calculates the sunlight reflection characteristic of one of the heliostats 104 from the light quantity distribution information and records it on the recording medium 109.

The camera 111 that acquires the light amount distribution on the screen 110 may be a device that acquires the light amount distribution directly such as a camera using a CCD sensor or a CMOS sensor, or a camera that acquires the light amount distribution indirectly such as a thermo camera. It is good.

In this embodiment, the light amount distribution is acquired by the camera 111. However, if the light amount distribution information on the screen can be acquired, an optical sensor or a thermal sensor arranged in an array on the screen is used. Also good.

Furthermore, in this embodiment, the solar reflection characteristics are measured for each heliostat, but may be measured for each part of the heliostat (for example, every two or three). By measuring every part of the heliostat, the time required to measure all heliostats can be shortened.

Then, after obtaining the sunlight reflection characteristics of one of the heliostats 104, the direction of the reflected light is controlled by the heliostat control unit 105 so as to irradiate the screen 110 with the reflected light of another heliostat. The solar reflection characteristics of this heliostat are measured. By repeating this control, the sunlight reflection characteristics can be measured for all the heliostats provided.

In the present embodiment, the sunlight reflection characteristic of each heliostat is obtained, but what kind of light collection distribution is taken on the light receiver 101 may be obtained.

As described above, according to the present embodiment, it is possible to grasp the sunlight reflection characteristics of the respective heliostats which are different depending on the dirt, scratches or distortion of the mirror over time.

The present embodiment has the same configuration as the solar light collecting apparatus of the first embodiment, but when acquiring the solar light reflection characteristics of each heliostat, more accurate solar light reflection characteristics can be obtained. The difference is that the measurement is made after correcting the dirt on the screen 110. Hereinafter, the difference from the first embodiment will be mainly described.

FIG. 2 is a measurement flowchart of the sunlight concentration distribution of each heliostat. A method for acquiring and storing the solar reflection characteristics of each heliostat in advance in this embodiment will be described with reference to the flowchart of FIG.

2 is executed every certain period (for example, about every week) by the heliostat control device 105. By executing for every certain period, the solar reflection characteristic of the latest heliostat is obtained, and the heliostat can be controlled based on this.

However, it is not limited to periodic execution, it may be executed at random intervals, or the value of the light received by the receiver, the amount of heat generated by the receiver, or the amount of power generated by the generator exceeds a certain threshold. Execution of the case is also acceptable.

The heliostat control device 105 selects the heliostat 104 for measuring the solar reflection characteristic this time from the heliostats for which the measurement of the solar reflection characteristic has not been completed, and sets the direction of the reflected light from the heliostat 104. The screen 110 is controlled to be irradiated (step s200).

Next, the light quantity distribution on the screen 110 is measured by the camera 111 (step s201).

Here, the light intensity distribution on the screen 110 varies depending on the dirt on the screen 110, the sunshine intensity at the time of measurement, and the position of the sun. Therefore, after correcting these (step s202, step s203, step s204), the CPU 106 calculates the sunlight reflection characteristics (step s205). By this correction, an accurate value of sunlight reflection characteristics can be obtained. The obtained sunlight reflection characteristics are stored in the recording medium 109 as a database (step s206).

Hereinafter, each step after step s201 will be described in detail. In the irradiation light measurement step s201, the heliostat control unit 105 controls the direction of the reflected light so as to irradiate the screen 110 with the reflected light from only one of the heliostats 104. Measure the light distribution. The camera 111 simultaneously collects information on the shutter speed and signal gain so that the brightness can be compared.

In the screen dirt correction step s202, the light collection distribution on the screen 110 in a state where no reflected light is irradiated from the heliostat measured in advance by the heliostat control unit 105 and the collection acquired in the irradiation light measurement step s201. Compare the light distribution. The heliostat control unit 105 calculates information such as screen stains and luminance distribution error components of the camera 111 from the comparison result.

Then, the heliostat control unit 105 removes the background information such as the screen dirt and the luminance distribution error component of the camera 111 and extracts the light amount distribution information obtained from the camera 111 so that the true light amount distribution information can be extracted. to correct.

In the sunshine intensity correction step s203 at the time of measurement, the heliostat control unit 105 uses the information of the direct solar radiation meter 112 at the time of measurement to eliminate changes in the light amount distribution information due to external factors such as weather and solar altitude.

That is, for example, when the weather is fine, the reflected light from the heliostat is strong, while when the weather is cloudy, the reflected light is weak. As a result, the light amount distribution on the screen 110 depends on the weather, solar altitude, etc. It will be influenced. Therefore, the heliostat control unit 105 calculates the current direct solar radiation amount from the measurement value of the direct solar radiation meter, and corrects the light amount distribution information obtained from the camera 111 based on the direct solar radiation amount.

In the image deformation correction step s204 based on the sun position, the heliostat control unit 105 corrects the change in the light amount distribution on the screen 110 due to the sun position. Hereinafter, this step will be described in detail with reference to FIG.

FIG. 3 is a diagram for explaining a change in the light amount distribution on the screen 110 according to the sun position.

The position of the sun varies with the passage of time, for example, from the sun position 301 at the reference time to the sun position 302 at the time of measurement. For this reason, in order to irradiate the screen 110 with the reflected light from one of the heliostats 104, the heliostat control unit 105 changes the direction of the reflected light from the one of the heliostats 104 over time. Must be controlled in conjunction with

However, when the direction of the heliostat changes, the light amount distribution on the screen 110 changes. For example, a light amount distribution 304 when the screen 110 is irradiated with sunlight from the sun position 301 at the reference time and a light amount distribution 305 when the screen 110 is irradiated with sunlight from the sun position 302 at the time of measurement. In the meantime, rotation of the light amount distribution (irradiation shape), lateral magnification change, vertical magnification change, and the like occur. For this reason, the light quantity distribution on the screen 110 and the sunlight reflection characteristics of one of the heliostats 104 do not simply match.

Therefore, in step s204, the light quantity distribution on the screen 110 obtained by the camera 111 is corrected by the heliostat control unit 105 based on the direction of the heliostat.

That is, the heliostat control unit 105 corrects the light amount distribution information so as to cancel the rotation of the light amount distribution, the lateral magnification change, and the vertical magnification change described above.

In the sunlight reflection characteristic calculation step s205, the heliostat control unit 105 calculates the sunlight reflection characteristic of one of the heliostats 104 from the information on the light amount distribution corrected in the steps so far.

In recording medium storage step s206, the heliostat control unit 105 stores the sunlight reflection characteristics of the heliostat obtained in step s205 on the recording medium 109 such as a hard disk, and constructs a database. The stored data includes device information such as a heliostat number, measurement date and time, and maintenance information.

Finally, in step s207, the heliostat control unit 105 measures the sunlight reflection characteristics of all the heliostats and determines whether or not they are recorded. If all the heliostats are stored, the measurement is terminated (step s208). If all the heliostats are not stored, the process is restarted from step s200.

In the present embodiment, the sunlight reflection characteristics and the like are calculated after correcting the information of the light quantity distribution obtained by the camera 111, but the sunlight reflection characteristics are calculated from the raw light quantity distribution obtained by the camera 111. Later, the sunlight reflection characteristics may be corrected. Further, the order of each correction is not limited to that shown in FIG. 2 and may be any order.

According to the present embodiment, accurate solar reflection characteristics can be measured for each heliostat without the influence of external factors such as screen contamination, sunshine intensity during measurement, and image deformation due to the sun position.

This example relates to the direction control of the reflected light from the heliostat based on the sunlight reflection characteristics of each heliostat obtained in Example 1 or 2. Hereinafter, the difference from the first and second embodiments will be mainly described.

The heliostat control device 105 receives a command related to the amount of light received by the light receiver 101 (or the heat generated by the light receiver 101 or the amount of power generated by the power generation unit) from the control device 115 of the power generation unit corresponding to the host device. The heliostat control device 105 that has received the command uses the sunlight reflection characteristics of each heliostat and performs control to select and use the necessary heliostat to satisfy this command.

This control makes it possible to predict thermal unevenness in a two-dimensional surface distribution on the light receiver. Further, by predicting the thermal unevenness, it is possible to predict the occurrence of a point exceeding the heat resistance temperature of the light receiver (hereinafter referred to as a hot spot). Then, by controlling the heliostat so as to avoid the occurrence of hot spots, the light receiver can be used at a temperature lower than the heat resistant temperature.

FIG. 4 is a flowchart of selection of a heliostat that irradiates reflected light to the heat receiver and determination of a condensing coordinate correction value. Hereinafter, the selection flowchart of the selection of the heliostat which irradiates reflected light to a heat receiver and the condensing coordinate correction value is demonstrated for every step using FIG. In addition, the sunlight reflection characteristic of each heliostat shall be recorded on the recording medium 109 before the start of this flowchart.

The heliostat control device 105 obtains a command regarding the amount of light received by the light receiver 101 from the control device 115 of the power generation unit corresponding to the host device at the start of this flowchart (step s400). In addition to the target heat amount, this command may include information on the temperature of the light receiver 101, the steam pressure inside the power generation unit, and the amount of heat to be supplied during the light collection operation.

Next, the heliostat control device 105 calculates the amount of heat to be generated on the light receiver and the total amount of reflected light to be collected on the light receiver in order to satisfy the command obtained in step s400. In addition, the heliostat control device 105 calculates a threshold value indicating how much deviation is allowed with respect to the calculated amount of heat and the total amount of reflected light (step s401). Here, the heliostat control device 105 calculates the allowable threshold value for deviation, but the user may directly input the threshold value.

Next, the heliostat control device 105 obtains information on the current sunshine intensity from the direct solar radiation meter 112. Then, the heliostat control device 105 calculates the total sum of the areas of the reflecting mirrors necessary for realizing the light condensing so as to satisfy the total amount of the reflected light calculated in step s401 in consideration of the current sunshine intensity. (Step s402).

Next, the heliostat control device 105 calculates the number of heliostats satisfying the total amount of the reflector areas calculated in step s402. Then, the heliostat control device 105 determines an initial selection pattern of the heliostat according to the calculated number (step s403).

It should be noted that heliostat selection here should not be biased to some heliostats due to problems such as durability and life. Therefore, in this embodiment, a heliostat is selected at random. However, any selection method may be used as long as the selection of the heliostat is not biased to some heliostats. As an example, there is a method of selecting every other number. As another example, there is a method in which the operation time of each heliostat is monitored by the heliostat control device 105, and a heliostat with a short operation time is preferentially selected. In this method, the operation time of each heliostat can be made uniform with high accuracy.

Next, the heliostat control device 105 reads sunlight reflection characteristic data for each heliostat selected in step s403 from the recording medium 109 (step s404).

Next, the heliostat control device 105 calculates the integrated light collection distribution on the light receiver 101 by the reflected light from each heliostat (step s405). As described above, the integrated light collection distribution is a distribution of the total sum of reflected light applied to the light receiver. Details of step s405 will be described with reference to FIG.

FIG. 5 is a diagram illustrating a method for obtaining the integrated light collection distribution. When four heliostats (respectively, heliostats 1 to 4) are selected, a method of calculating the integrated light collection distribution on the light receiver 101 from the sunlight reflection characteristics of each heliostat is shown. .

In FIG. 5, sunlight reflection characteristic information 501 to 504 is a two-dimensional representation of the sunlight reflection characteristic on the light receiver 101 at the reference time for each of the heliostats 1 to 4 read from the database on the recording medium 109. This is expressed by the correlation between the position [nm] and the sunlight reflection intensity [w / m ² ]. In step s405, first, steps s505 to s508 are performed, in which the sunlight reflection characteristic of each heliostat is transformed into the sunlight reflection characteristic in consideration of the sun position at the current time and the direction of the reflecting mirror. Subsequently, in steps s509 to s512, the sunlight reflection characteristics are modified according to the correction amount of the condensing position correction set in step s412 described later. The initial value of the correction value for condensing position correction is zero. For this reason, this deformation is not performed at the time of the initial flow. Finally, in step s513, an integrated light collection distribution on the light receiver 101 is derived from the sunlight reflection characteristics deformed in steps s505 to s512.

Next, the heliostat control device 105 obtains the total amount of heat generated on the light receiver 101 from the integrated light collection distribution calculated in step s405. Then, it is compared with the target total heat amount (or the total amount of reflected light) calculated in step s401, and the light collection state is determined based on whether or not the total heat amount (or the total amount of reflected light) is within the allowable threshold (step s406). ).

When the total heat amount is within the threshold (step s406: Yes), the process proceeds to step s407, and the heliostat control device 105 determines whether there is a hot spot on the light receiver 101 from the integrated light distribution on the light receiver 101. Thus, the light collection state is determined (step s407).

If it is determined that there is no hot spot on the light receiver (step s407: Yes), the heliostat control device 105 determines the heliostat selection pattern at this time as the final heliostat selection pattern. In addition, when the condensing position correction is performed in step s412 described later, the correction value is determined as the final correction value (step s408).

Finally, the heliostat control device 105 controls the direction of the reflected light from the heliostat based on the final heliostat selection pattern determined in step s408 and the correction value, and reflects the reflected light to the light receiver 101. , And condensing is started (step s409).

Then, after a certain time has passed (for example, several minutes to several hours), the process returns to step s401.

On the other hand, when it is determined in step s406 that the total heat amount (or the total amount of reflected light) on the light receiver exceeds the allowable threshold calculated in step s401 (step s406: No), the heliostat control unit 105 The total amount of heat (or the total amount of reflected light) on the light receiver is compared with the target total heat amount (or the total amount of reflected light), and the number of heliostats used for condensing is increased or decreased (step s410). Thereafter, the process returns to step s404.

In step s407, when it is determined that there is a hot spot on the light receiver (step s407: Yes), the heliostat control unit 105 reflects the solar spot in the vicinity of the hot spot position from each heliostat. A heliostat in which the amount of light is concentrated is searched (step s411).

Next, the heliostat control unit 105 sets the direction of the reflected light for the heliostat in which the amount of reflected light is concentrated near the position of the hot spot searched in step s411 (the heliostat causing the hot spot). Control to be changed is performed (hereinafter referred to as condensing position correction). In this embodiment, the irradiation direction of the reflected light is changed so that the irradiation position of the reflected light from the heliostat moves about half of the size of the hot spot. The changing direction of the irradiation direction is randomly moved (the moving amount and the changing direction at this time are referred to as a correction value for correcting the condensing position) (step s412). The correction value determination method is not limited to the above method, and for example, the correction value may be determined so that the reflected light is concentrated on a portion where the amount of reflected light is not concentrated.

Next, the heliostat control device 105 determines whether or not the number of processes in step s412 is within a set threshold (step s413). This is because when a hot spot is generated even if the step s412 is repeated many times, the heliostat used for condensing is changed to avoid the generation of the hot spot. If the determination result in step s413 is within the threshold (step s413: Yes), the process returns to step s404.

On the other hand, if the determination result in step s413 exceeds the threshold value (step s413: No), the selection pattern of the heliostat is switched after resetting the number of processes in step s412 (step s414). By preventing the total number of selected heliostats from changing before and after switching, it is possible to change only the integrated light collection distribution on the receiver without changing the total area of the reflector, avoiding hot spots. be able to.

The heliostat selection pattern can be switched by any method, but about half of the heliostat in which the amount of reflected light is concentrated in the vicinity of the hot spot is not used for the standby heliostat. By exchanging with the stat, it is possible to reduce the possibility of hot spots occurring at other locations while reducing the amount of heat generated at the positions of the hot spots so far.

After step s414, the process returns to step s404.

As described above, according to the present embodiment, based on the sunlight reflection characteristics of each heliostat, the two-dimensional surface distribution thermal unevenness on the light receiver is predicted, and the direction of the reflected light from the heliostat is controlled. Thus, the occurrence of hot spots on the light receiver can be avoided. Thereby, the local thermal damage of the light receiver by a hot spot can be suppressed, and the lifetime improvement of a light receiver can be implement | achieved. In addition, by repeating this flowchart periodically for several minutes to several hours, even if a hot spot occurs due to a change in solar reflection characteristics over time, the period during which the hot spot is generated can be shortened. it can.

This example relates to the determination of the necessity of maintenance of the reflector of the heliostat based on the sunlight reflection characteristics of each heliostat. Hereinafter, the difference from the first to third embodiments will be mainly described.

FIG. 6 is a flowchart showing a maintenance determination method for a heliostat reflector. Based on the control shown in this flowchart, it is possible to determine, for each heliostat, whether or not the reflecting mirror is soiled over time or whether or not the reflecting mirror is damaged. In other words, it is possible to determine the time for cleaning the heliostat to remove the dirt from the reflecting mirror and the time for replacement with a reflecting mirror without scratches one by one. Details of each step will be described below.

As a premise, it is assumed that the reflector has been replaced, cleaned, and the surface has been adjusted before starting these processes. Furthermore, after the replacement, cleaning, and surface adjustment, it is assumed that the solar reflection characteristics of each heliostat are stored in the recording medium 109 based on the flowchart according to the second embodiment.

First, the sunlight reflection characteristics of each heliostat at the start of processing are acquired and stored (step s601). The acquisition and storage method is as described in the second embodiment.

Next, the heliostat control unit 105 reads the sunlight reflection characteristic information from the database in the recording medium 109, the sunlight reflection characteristic acquired after the previous cleaning of the reflector, and the current sunlight reflection acquired this time. Compare characteristics. By this comparison, the decrease (deterioration, deterioration) of the sunlight reflection characteristics over time from the previous cleaning of the reflector for the same heliostat is calculated as the characteristic decrease amount 1. (Step s602)
Next, the heliostat control unit 105 determines whether or not the amount of decrease in sunlight reflection characteristics calculated in step s602 has reached a threshold (step s603).

When it is determined that the amount of decrease in the sunlight reflection characteristic is within the threshold (that is, almost no decrease in the sunlight reflection characteristic is observed) (step s603: No), the state of the reflector on the heliostat is It is normal. For this reason, the heliostat control unit 105 determines that it is unnecessary to clean or replace the reflecting mirror on the heliostat (that is, without outputting an instruction to clean or replace the reflecting mirror), and the process of FIG. Is finished (step s604).

On the other hand, when it is determined that the amount of decrease in the sunlight reflection characteristic is equal to or greater than the threshold (step s603: Yes), it is recognized that the sunlight reflection characteristic has decreased over time. One of the causes of the deterioration of the sunlight reflection characteristics is that the reflector on the heliostat gets dirty over time.

Therefore, the heliostat control unit 105 outputs an instruction to carry out cleaning of the reflecting mirror on the heliostat in order to remove the dirt (step s605).

Although not shown as a step, the reflecting mirror may be cleaned by a person who has seen the cleaning instruction, or a wiper or a nozzle controlled by the heliostat control unit 105 is provided and automatically receives the instruction. You may make it clean by.

After performing the cleaning of the reflecting mirror, the light receiving device sunlight reflection characteristics of the heliostat that has performed the cleaning of the reflecting mirror are acquired based on the flowchart described in the second embodiment (step s606). Since it is immediately after cleaning of the reflecting mirror, it is considered that the sunlight reflection characteristics obtained at this time are almost free from the influence of dirt on the reflecting mirror.

Next, the heliostat control unit 105 reads information from the database in the recording medium 109, and reflects the sunlight reflection characteristics obtained after the previous reflector replacement and the sunlight reflection after cleaning of the reflector obtained in step s606. Compare characteristics. By this comparison, the decrease in sunlight reflection characteristics over time from the previous replacement of the reflector for the same heliostat is calculated as the characteristic decrease amount 2 (step s607).

Next, the heliostat control unit 105 determines whether or not the reduction amount of the sunlight reflection characteristic calculated in step s607 has reached a threshold (step s608). When it is determined that the amount of decrease in the sunlight reflection characteristic calculated in step s607 is equal to or greater than the threshold (step s608: Yes), it is recognized that the sunlight reflection characteristic has not been recovered even by cleaning the reflecting mirror.

That is, it can be determined that the cause of the deterioration of the solar reflection characteristics is that the reflector has scratches, corrosion, or dirt that cannot be removed by cleaning. Therefore, the heliostat control unit 105 outputs an instruction to replace the reflecting mirror (step s612).

Although not shown as a step, the reflector can be replaced by the user who has seen the instruction to replace the reflector, or by providing a reflector transporter controlled by the heliostat control unit 105, etc. You may be made to perform.

Further, after step s612 is performed, the state of the reflecting mirror is normal, and thus the processing of FIG. 6 is terminated.

On the other hand, when it is determined that the amount of decrease in the sunlight reflection characteristic is within the threshold (step s608: No), it is recognized that the sunlight reflection characteristic has been recovered by cleaning.

However, it is conceivable that a force is applied to the reflecting mirror during cleaning work, and the reflecting mirror is distorted. Therefore, in the above case (step s608: No), the process proceeds to step s609, and the amount of distortion of the reflector on the heliostat is calculated and determined.

The calculation of the amount of distortion of the reflecting mirror is performed by the heliostat control unit 105 reading the information from the database in the recording medium 109, the solar reflection characteristics acquired after the previous mirror adjustment or replacement, and the sun acquired in step s606 this time. This is done by comparing the light reflection characteristics.

The amount of distortion of the reflector is calculated based on the amount of change in the center position where the heliostat collects sunlight and the amount of change in the standard deviation of the sunlight reflection characteristics (step s609). The amount of change in the condensing center position is represented by the following formula: | the condensing center position after the previous surface adjustment of the reflecting mirror−the condensing center position after cleaning |. The amount of change in the standard deviation of the sunlight reflection characteristic is expressed by the following formula: (standard deviation after cleaning−standard deviation after surface adjustment of the previous reflector).

Next, the heliostat control unit 105 determines whether or not the distortion amount of the reflector calculated in step s609 has reached a threshold value (step s610).

There are two types of distortion of the reflecting mirror: the amount of change in the center position of the condenser and the amount of change in the standard deviation of the sunlight reflection characteristics. In this step, if either of them has reached the threshold, Then, it is determined that the distortion of the reflecting mirror is large, and the heliostat control unit 105 proceeds with the process of step s610: Yes and outputs an instruction to readjust the surface of the reflecting mirror (step s613). After step s613 is performed, since the reflecting mirror is in a normal state, the processing in FIG. 6 is terminated.

On the other hand, when the amount of distortion of the reflecting mirror calculated in step s608 is within the threshold (step s610: No), the reflecting mirror is in a normal state (dirt can be removed by cleaning, the reflecting mirror is not damaged, and is reflected during cleaning. The heliostat control unit 106 ends the process of FIG. 6 (step s611).

Hereinafter, with reference to FIG. 7, a description will be given of changes in sunlight reflection characteristics when the reflecting mirror is cleaned in the present embodiment. In FIG. 7, the data recording time advances from the top to the bottom of FIG.

FIG. 7 is an explanatory diagram showing changes in sunlight reflection characteristics of each heliostat. As an example, state management of the heliostats 1 to 3 is performed. Actually, it is desirable to perform this state management for all the heliostats provided.

In the database in the recording medium 109, sunlight reflection characteristic data of each heliostat is stored. In addition, the time when the sunlight reflection characteristics are acquired, the maintenance information performed before the acquisition, and the like are associated with the information of each heliostat and stored.

Hereafter, the state of the reflector will be described for each heliostat.

In the "Heliostat 1" column in the figure, the change in the solar reflection characteristics over time of the heliostat that has become dirty on the reflector is shown.

In the “Heliostat 2” column in the figure, the time-dependent change in the sunlight reflection characteristics of the heliostat in which the reflector is damaged is shown.

In the "Heliostat 3" column in the figure, the time-dependent change in the sunlight reflection characteristics of the heliostat in which the reflecting mirror is soiled and the reflecting mirror is distorted during cleaning is shown. ing.

“T01” in the figure indicates the solar reflection characteristics of each heliostat obtained at the time of the previous reflector replacement.

“T02” in the figure indicates the solar reflection characteristics of each heliostat obtained after a while after the reflector replacement.

“T03” in the figure shows the sunlight reflection characteristics of each heliostat obtained after a while from T02.

Suppose that the reflector on each heliostat has been cleaned at the time of “T04” in the figure.

“T05” in the figure indicates the sunlight reflection characteristics of each heliostat obtained after cleaning of the reflector performed at T04.

In “T06” in the figure, the contents of maintenance work for each heliostat performed by receiving information on the solar reflection characteristics of each heliostat acquired at the time of T05 (replacement of reflectors, The surface adjustment of the reflector for distortion removal is shown.

“T07” in the figure indicates the solar reflection characteristics of each heliostat obtained after the maintenance work performed at the time of T06.

The solar reflection characteristics of each heliostat decrease with time from T01 to T02 and T03. This is because, as described above, the reflecting mirror becomes dirty and scratched as time passes.

Suppose that the amount of decrease in sunlight reflection characteristics exceeds the threshold at the time of measurement of sunlight reflection characteristics at T03. Then, the heliostat control unit 105 outputs an instruction to clean the reflecting mirror based on step s603.

In the case of Heliostat 1, the decrease in the sunlight reflection characteristics is due to the dirt on the reflector surface. For this reason, the heliostat 1 can remove the dirt of the reflecting mirror by cleaning the reflecting mirror. As a result, the sunlight reflection characteristic is recovered (T05).

Furthermore, since the sunlight reflection characteristic has been recovered by cleaning, it is determined that the reflector is not scratched (step s608). Furthermore, the sunlight reflection characteristic after cleaning (T06) is almost the same as the sunlight reflection characteristic at time T01. For this reason, it is determined that there is no distortion in the reflecting mirror after cleaning (step s610), and the maintenance work for the heliostat 1 ends.

Next, heliostat 2 will be described. In the case of the heliostat 2, the decrease in sunlight reflection characteristics is due to scratches or the like generated on the reflecting mirror. For this reason, the sunlight reflection characteristic of the heliostat 2 is not recovered by cleaning (T05). For this reason, the heliostat control unit 105 determines that the reflector on the heliostat 2 has many scratches based on step s608.

Thereafter, the heliostat control unit 105 outputs an instruction to replace the reflecting mirror based on step s612. By exchanging with a reflector that is free from dirt and scratches, the sunlight reflection characteristics of the heliostat 2 become normal (T07).

Next, the heliostat 3 will be described. In the case of the heliostat 3, the decrease in the sunlight reflection characteristics is due to the dirt on the reflecting mirror surface. For this reason, similarly to the case of the heliostat 1, the sunlight reflection characteristic is recovered by cleaning the reflecting mirror. However, in the case of the heliostat 3, since the distortion | strain also has generate | occur | produced in the surface of a reflective mirror, the sunlight reflective characteristic after cleaning will be broken as shown in the column of T05.

Therefore, the heliostat control unit 105 determines that the mirror is distorted based on step s610. Thereafter, the heliostat control unit 105 outputs an instruction to readjust the mirror surface based on step s613 (step s613). By adjusting the surface of the reflecting mirror, the sunlight reflection characteristics become normal (T07).

As described above, according to the present embodiment, it is possible to determine the necessity for cleaning, replacement, or surface adjustment of the reflecting mirror of the heliostat without visual inspection of each unit.

This example relates to the prediction of the maintenance time of the heliostat reflector based on the sunlight reflection characteristics of each heliostat. Hereinafter, the difference from the first to fourth embodiments will be mainly described.

FIG. 8 is an explanatory diagram showing a method of predicting the cleaning time of the reflecting mirror. The vertical axis of this graph represents the amount of decrease in the solar reflection characteristic during periodic measurement of the solar reflection characteristic (step s602), and the horizontal axis represents time.

The time axis starts from the point 711 when the reflector is cleaned. As the current reflector time 712 elapses from the previous reflector cleaning time 711, the amount of decrease in the sunlight reflection characteristics gradually increases. As long as there is no significant change in the installation environment of the heliostat, the amount of decrease in sunlight reflection characteristics will continue to increase.

The heliostat control unit 105 draws a prediction straight line 715 of the future solar reflection characteristic based on the actual measurement 714 of the temporal change in the solar reflection characteristic from the previous reflector cleaning time 711 to the current time point 712, The next reflection mirror cleaning time 713 that reaches the sunlight reflection characteristic deterioration threshold value can be predicted.

FIG. 9 is an explanatory diagram showing a method of predicting the replacement time of the reflecting mirror. The vertical axis of this graph represents the amount of decrease in the solar reflection characteristics (that is, the amount of scratches generated in the reflection mirror) at the time of measuring the solar reflection characteristics after the cleaning of the reflecting mirror (step s607), and the horizontal axis represents time. Put.

The time axis starts from the time when the reflector is replaced 721. The amount of scratches on the reflecting mirror gradually increases as the current reflecting time 722 elapses from the previous reflecting mirror replacement time 721. Unless there is a major change in the installation environment of the heliostat, the amount of scratches will continue to increase.

The heliostat control unit 105 draws a prediction straight line 725 for the future solar reflection characteristic based on the actual measurement 724 of the temporal change of the solar reflection characteristic from the previous reflector replacement 721 to the current time point 722, The next reflecting mirror replacement time 723 that reaches the reflecting mirror damage threshold value can be predicted.

FIG. 10 is an explanatory diagram showing a method of predicting the adjustment time of the reflecting mirror surface. The vertical axis of this graph is the amount of distortion of the reflecting mirror when measuring the sunlight reflection characteristics after cleaning the reflecting mirror (step s609), and the horizontal axis is time.

The time axis starts from the point of time 731 when the reflector is replaced or the surface is readjusted. The reflector is gradually distorted as the current time point 732 elapses from the previous time when the reflector is replaced or the surface is readjusted 731. As long as there is no significant change in the installation environment of the heliostat, the amount of distortion will continue to increase.

The heliostat control unit 105 draws a prediction line 735 for the future solar reflection characteristic based on the actual measurement 734 of the temporal change in the solar reflection characteristic from the previous reflector replacement 731 to the current time point 732, The next reflecting mirror replacement time 733 that reaches the reflecting mirror flaw amount threshold value can be predicted.

In this embodiment, the prediction straight line is drawn. However, depending on the tendency of changes in the sunlight reflection characteristics, a prediction curve may be drawn.

As described above, according to the present embodiment, it is possible to predict the maintenance time of the reflector of the heliostat by comparatively analyzing the data of the sunlight reflection characteristics for a plurality of periods.

Since heliostats are installed outdoors, they may be exposed to strong winds, and the angle of the reflector may change or the surface of the reflector may be distorted due to the influence of the wind. As a result, there is a problem that the sunlight reflection characteristics may change.

On the other hand, the heliostat that was not selected in step s408 of the third embodiment is not used for light collection until the flowchart of the third embodiment is processed again and selected in step s408. Further, after the maintenance instruction is output in any of steps s605, s612, or s613 in the fourth embodiment, the heliostat is not used for light collection until the maintenance is performed. If a heliostat that is not used for light collection is used for wind protection, it is possible to prevent other heliostats that are collecting light from affecting the wind.

Therefore, the present embodiment relates to a solar light collecting device that uses heliostats for wind protection and reduces the influence of each heliostat on the wind. Hereinafter, the difference from the first to fifth embodiments will be mainly described.

FIG. 11 is a schematic configuration diagram of a solar light collecting device equipped with a windproof heliostat.

In this embodiment, a wind direction and wind speed sensor 902 is provided in the vicinity of the heliostat to detect the wind direction and the wind speed.

Also, the heliostat control unit 105 confirms that the current wind speed is equal to or lower than the wind resistant speed of the heliostat by the wind direction and wind speed sensor 902.

The heliostat control unit 105 uses a heliostat that is installed in the windward direction among heliostats that are not used for light collection as the windproof heliostat 901. For example, the reflecting mirror driver 120 is controlled so that the reflecting mirror has an angle of 45 degrees with respect to the wind.

In this embodiment, as the windproof heliostat 901, the one installed in the windward direction is used. However, a heliostat installed in the vicinity of the outer periphery may be used, and a fixed interval may be used. A heliostat with a gap may be used. Furthermore, the installation of a windproof heliostat can be optimized by installing a plurality of wind direction and wind speed sensors.

On the other hand, if the wind speed value is higher than the wind speed of the heliostat, the heliostat may be damaged if the condensing operation or windbreak operation continues.

Therefore, the heliostat control unit 105 stops the condensing operation and windbreak operation of all the heliostats in the plant, and the direction of the reflecting mirrors of each heliostat is set so that the inclination of the reflecting mirrors of the heliostat is near the horizontal. To control. This control can prevent the heliostat from being damaged under strong winds. Hereinafter, this control is referred to as “standby mode”.

From the standpoint of avoiding damage to the heliostat, the angle of the reflector of each heliostat in the “standby mode” is most preferably a horizontal position that tends to be parallel to the wind direction. This is because each heliostat (the reflecting mirror) is least affected by the wind if it is parallel to the wind direction. However, if the reflector is kept in a perfectly horizontal position, rain and sand tend to stay on the surface of the reflector, and dirt is likely to accumulate on the reflector.

Therefore, in the “standby mode”, it is desirable to tilt the surface of the reflector 3 ° to 10 ° from the horizontal position. Due to the inclination of the reflecting mirror, water droplets and dust on the reflecting mirror surface easily flow down. Since the inclination of the reflecting mirror surface is slight, the reflecting mirror is hardly damaged even under strong winds.

If the tilt angle of the mirror surface is increased, the effect of water droplets and dust flowing down increases, but the possibility of breakage of the reflector increases. For this reason, the inclination angle of the reflecting mirror surface in the “standby mode” is determined to be an optimum value based on the assumed wind speed, precipitation, and amount of attached dust in the installation environment.

As described above, according to the present embodiment, the wind-proof heliostat 901 can reduce the influence of wind on the heliostat 103 during the light collecting operation. In addition, the possibility of damage to the heliostat can be reduced while preventing accumulation of dirt even in strong winds.

As described above, the solar light collecting apparatus according to Example 6 has the “standby mode” for avoiding damage to the heliostat in a strong wind state. However, even in this “standby mode”, the reflector portion vibrates (chatters) under strong winds, and the joint portion between the reflector 119 and the support leg 121 may be fatigued. Hereinafter, the mechanism of the vibration generation will be described with reference to FIGS. 12 and 13.

FIG. 12 is a diagram showing the support structure of the reflecting mirror. The reflecting mirror 119 and the support leg 121 are coupled via a support portion 951.

FIG. 13 is a schematic diagram of the vibration of the reflecting mirror caused by the wind. Since the heliostat is installed outdoors, the wind blown at that position is not always constant, and both the wind direction and the wind speed pulsate. It is assumed that the reflecting mirror 119 is slightly distorted in the direction (downward direction) of FIG. 13A due to wind pulsation (wind direction, wind speed), for example. When the distortion starts, the cross-sectional area on which the wind hits increases, so that it is more strongly affected by the wind. As a result, the strain further increases.

Here, since the reflecting mirror has elasticity, the reaction force increases as the strain increases and is related to the pulsation of the wind. As shown in FIG. 13B, the direction opposite to FIG. Direction). Even on this side, the state returns to the state of FIG. 13A due to the increase in strain and the pulsation of the wind. By repeating this, the reflecting mirror vibrates. At this time, in the support portion 951 that couples the reflecting mirror 119 and the support leg 121, the direction of stress is reversed according to vibration, and fatigue progresses. Eventually, the reflector will be broken.

Therefore, the present embodiment relates to a solar light collecting device provided with a lift generating member on the reflecting mirror or supporting portion of each heliostat in order to suppress the vibration of the reflecting mirror. Hereinafter, the difference from the first to sixth embodiments will be mainly described.

FIG. 14 is a schematic view of the lift generating member of the reflecting mirror. A streamline-shaped lift generating member 952 is provided on the outer periphery of the lower surface of the reflecting mirror 119. When the wind parallel to the plane mirror 119 is received, the lift generating member 952 generates a downward lift. Thereby, when the wind is generated in the “standby mode”, the plane mirror 119 receives the lift force downward by the lift force generation member 952 provided in the heliostat, so that the vibration shown in FIG. 13 can be suppressed. Note that vibration can be suppressed if lift force can be received in a specific direction, not limited to the downward direction.

Specifically, the force received by the reflecting mirror 119 by the wind in the state of FIG. 13B is upward, whereas in the example of FIG. 14, it remains downward due to lift. Therefore, the amplitude of the vibration of the mirror can be suppressed. As a result, the stress at the support portion 951 is reduced, and the period until fatigue failure can be greatly prolonged.

Here, the magnitude of the lift force to be generated is represented by the equation T = (Vw / V0) · (ΔL / L0) · P. T is the lift generated by the lift generating member 952, Vw is the wind speed, V0 is the average speed of the molecule (about 500 m at room temperature), L0 is the width of the lift generating member 952, and P is the atmospheric pressure. ΔL is the difference between the length of the convex portion and the length of the concave portion of the lift generating member 952. For example, when a convex part of ΔL = 6 mm is formed on a 600 mm long mirror with a width of L = 30 mm and a wind of 50 m / sec is hit, a force of about 3.6 kg is applied to one side.

The shape (width, curvature, etc.) of the lift generating member 952 is designed according to the assumed wind force (wind speed) and the spring coefficient of the member.

15 to 19 show modifications of the lift generating member according to the present embodiment.

FIG. 15 is a configuration diagram of lift generating members for a plurality of reflecting mirrors. It is an example of a lift generating member in the case of installing a plurality of reflecting mirrors on one gantry. The lift generating member 952 is provided only in the outermost peripheral part when the plurality of reflecting mirrors 119 are regarded as one reflecting mirror. In the portion where the lift generating member 952 is not provided, some vibration is generated in the reflecting mirror 119, but this vibration can be reduced to an extent that does not cause a problem by reducing the gap between the reflecting mirrors 119.

FIG. 16 is another configuration diagram of lift generating members for a plurality of reflecting mirrors. It is another example of a lift generating member in the case of installing a plurality of reflecting mirrors on one gantry. A lift generating member 952 is provided on the outer periphery of each of the plurality of reflecting mirrors 119. In the case where the gap between the reflecting mirrors 119 is increased, it is preferable to provide a lift-speaking member on the outer peripheral portion of all the reflecting mirrors.

FIG. 17 is a configuration diagram of a reflecting mirror having a curvature. A curvature is given to the apex portion of the rectangular reflecting mirror 119, and the portion with the curvature is used as a lift generating member 952. Also in this case, the effect of the lift generating member 952 is great as in the example of FIG. Furthermore, the curvature portion avoids the generation of wind vortices and the vibration of the reflector is further reduced.

FIG. 18 is a configuration diagram of a reflecting mirror having a convex portion on the reflecting mirror surface. This is an example in which a convex portion is formed on the reflecting mirror side. In this case, there is a demerit that the area of the reflecting mirror is reduced, but on the other hand, there is an effect that the dust does not directly hit the surface of the reflecting mirror.

FIG. 19 is a configuration diagram of a reflecting mirror whose end is bent. It is an example of the lift generation | occurrence | production member by a bending structure. In a reflecting mirror made of metal or the like, the lift generating member 952 can be configured by bending the end of the reflecting mirror 119. Since the reflector itself is simply bent, the production cost can be reduced.

As described above, according to the present embodiment, it is possible to suppress the vibration of the reflecting mirror even under a strong wind, and to reduce the possibility of breakage of the connecting portion of the reflecting mirror.

In addition, this invention is not limited to said Example, The replacement | exchange and addition of a structure in the range which does not deviate from the summary, replacement of a process order, deletion, etc. are possible.

DESCRIPTION OF SYMBOLS 101 ... Light receiver, 102 ... Tower, 103 ... Heliostat, 104 ... One of heliostats, 105 ... Heliostat control device, 106 ... CPU part, 107 ... Input part, 108 ... Display part, 109 ... Recording medium 110 ... Screen, 111 ... Camera, 112 ... Direct pyranometer, 113 ... Cooling equipment, 114 ... Piping, 115 ... Control device, 117 ... Piping, 118 ... Steam turbine, 119 ... Reflective mirror, 120 ... Reflective mirror driver, DESCRIPTION OF SYMBOLS 121 ... Supporting leg, 301 ... Solar position at reference time, 302 ... Solar position, 304 ... Light quantity distribution, 305 ... Light quantity distribution, 901 ... Windproof heliostat, 902 ... Wind direction and wind speed sensor, 951 ... Supporting part, 952 ... Lifting force Generating member

Claims (15)

1. A receiver for receiving the irradiated light;
   A plurality of heliostats that reflect sunlight and irradiate the receiver with the reflected light;
   A control device that controls reflected light from the heliostat by controlling the plurality of heliostats;
   In a solar concentrator equipped with
   A measurement mechanism that is irradiated with reflected light from a part of the plurality of heliostats, and that measures the sunlight reflection characteristics of the heliostat based on the reflected light;
   A solar condensing device comprising:
   
2. The solar light collecting device according to claim 1,
   Control of the reflected light from the heliostat by the control device is performed based on the sunlight reflection characteristics of the heliostat or the heat distribution of the light receiver obtained from the sunlight reflection characteristics. Optical device.
   
3. The solar light collecting device according to claim 2,
   The said control apparatus controls the said heliostat so that the calorie | heat amount distribution on the said light receiver may become below the heat-resistant temperature of the said light receiver, The solar condensing device characterized by the above-mentioned.
   
4. The solar light collecting device according to claim 1,
   The measurement mechanism includes a reflected light receiver to which reflected light from the heliostat is irradiated, and a light amount acquisition unit for acquiring a light amount distribution of the reflected light receiver.
   
5. The solar light collecting device according to claim 1,
   The solar light collecting device, wherein the measurement of the sunlight reflection characteristic of the heliostat by the measurement mechanism is performed when the state of the heliostat satisfies a predetermined condition.
   
6. The solar light collecting device according to claim 1,
   The measurement of the solar reflection characteristic of the heliostat by the measurement mechanism is performed when at least one of the operation time of the solar light collecting device or the integrated value of the light reception amount or the heat generation amount of the light receiver satisfies a predetermined condition. The solar condensing device characterized by the above.
   
7. The solar light collecting device according to claim 1,
   A storage unit for storing measurement results of solar reflection characteristics of the heliostat;
   By the measurement mechanism, the solar reflection characteristic of each heliostat is measured at regular intervals,
   The said control part judges the maintenance time of each heliostat by comparing and analyzing the sunlight reflection characteristic for several periods memorize | stored in the said memory | storage part, The solar light condensing device characterized by the above-mentioned.
   
8. The solar light collecting device according to claim 1,
   The control unit analyzes the at least one of dirt, scratches, and distortion of each heliostat by comparing the sunlight reflection characteristics for the plurality of periods, and determines the maintenance time of each heliostat. A featured solar concentrator.
   
9. In a solar light collecting device for collecting reflected light from a plurality of heliostats on a light receiver, a solar light collecting control device for controlling the heliostat,
   Based on the reflected light emitted from the heliostat, a measurement mechanism for measuring the solar reflection characteristics of the heliostat;
   A storage unit for storing sunlight reflection characteristics measured by the measurement mechanism;
   A solar light condensing control device comprising:
   
10. The solar light collecting control device according to claim 9, wherein
    The control of the heliostat calculates the heat distribution of the light receiver from the solar reflection characteristics of the heliostat stored in the storage unit, and the heat distribution of the light receiver is equal to or lower than the heat resistant temperature of the light receiver. The solar light condensing control device characterized by being performed.
    
11. The solar light collecting control device according to claim 9, wherein
    The solar light collection control device, wherein the measurement unit includes a reflected light receiver that receives the reflected light from the heliostat and a light amount acquirer that acquires a light amount distribution of the reflected light receiver.
    
12. The solar light collecting control device according to claim 9, wherein
    The measurement mechanism measures the solar reflection characteristics of each heliostat at regular intervals, and compares and analyzes the solar reflection characteristics for a plurality of periods stored in the storage unit, thereby determining the maintenance time of each heliostat. A sunlight condensing control device characterized by determining.
    
13. A method of controlling a plurality of solar reflectors that collects reflected light on a light receiver,
    Controlling the reflected light from some of the plurality of solar reflectors to irradiate the measurement unit that measures the solar reflective characteristics of the solar reflector, and measuring the solar reflective characteristics A control method for a plurality of solar reflectors.
    
14. The method of controlling a plurality of solar reflectors according to claim 13,
    A control method for a plurality of solar reflectors, wherein the solar reflectors are controlled such that a heat distribution of the optical receivers is equal to or lower than a heat resistant temperature of the optical receivers.
    
15. The method of controlling a plurality of solar reflectors according to claim 13,
    Solar reflector control characterized by measuring sunlight reflection characteristics of a solar reflector at regular intervals and judging the maintenance time of the solar reflector from changes in the measurement results of the sunlight reflection characteristics Method.

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