JP2015010748A - Trough-type solar heat collection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trough-type solar heat collection device which has curvature and reduces dirt on a mirror surface plate surface.SOLUTION: A trough-type solar heat collection device includes a plurality of vent holes 105 penetrating a mirror surface plate 104 having curvature to connect the front side and the back side thereof. The vent holes allow air, dustproof, and sand to pass from the front side to the back side of the mirror surface plate surface.

Description

  The present invention relates to a trough solar heat collecting apparatus that collects and irradiates sunlight onto a heat collecting pipe with a mirror surface plate having a curvature.

  In recent years, products related to power generation, hot water supply, cooling and heating using renewable energy have been developed and put into practical use for the purpose of reducing fossil fuel consumption and reducing carbon dioxide emissions. Among them, a solar heat collecting apparatus that obtains heat by heating a heat collector with sunlight is excellent in that it can concentrate sunlight having a low energy density in a condensing process and can store energy by heat storage. As a solar heat collecting apparatus, a tower type, a dish type, a trough type, and the like have been proposed. As an example, the configuration of a trough solar heat collector will be described below.

  The trough solar heat collector arranges a mirror surface plate with a curvature toward the sun, and irradiates reflected light from the mirror surface plate to a heat collecting pipe installed at the focal point. In the heat collection pipe, a heat medium such as molten salt, water, oil, etc. flows depending on the heat application, and the fluid flowing inside the heat collection pipe is exchanged by heat exchange with the heated heat collection pipe. Recover heat.

  The mirror plate is generally a movable type that can adjust the incident angle of sunlight. In addition, the heat collecting pipe uses a transparent heat insulating pipe made of a material having high light transmittance such as glass so that heat is effectively recovered, and the pipe is vacuum insulated.

  Here, the heat recovery performance of the solar heat collector is affected by the reflectance of the mirror plate that reflects sunlight and the light transmittance of the transparent heat insulating tube. In order to keep the heat recovery performance in a good state, it is necessary to reduce the surface contamination of the mirror plate and the transparent heat insulating tube. In particular, when a solar heat collector is applied as a power generation facility, a large amount of heat recovery devices must be laid, which makes it a challenge to save labor in cleaning maintenance work that maintains heat recovery performance in a good state.

  Patent Document 1 describes an example of a solar water heater in which a light transmitting hole is opened in a heat collecting box in which a panel-shaped heat collecting portion is disposed.

JP-A-6-117703

  The method proposed by Patent Document 1 is to provide a transparent hole in a light-transmitting portion (flat plate) of a heat collecting box that is a casing, so that when the heat collecting box is used as a boundary wall, the outer surface side perspective confirmation is performed. It is a technique that facilitates and is not a technique for reducing contamination of a mirror plate having a curvature as a main part of a trough solar heat collector.

  Trough solar thermal collectors are often used as solar thermal power generation equipment. In this case, it will be installed in a desert or wilderness area where sunlight is strong and the site can be secured. In the desert and wilderness areas, the wind winds up dust and sand particles and blows them onto the mirror plate. When dirt or sand particles adhere to the sunlight reflecting surface of the mirror plate, there is a problem that the reflectance of sunlight is lowered and the heat recovery performance is lowered.

  Moreover, the solar heat collecting device using a mirror surface plate has recently increased in size around one mirror surface plate for the purpose of increasing the amount of collected light. The resistance of the mirror plate to the wind is increased by increasing the size of the mirror plate. In particular, since the mirror plate of the trough solar heat collector has a curvature, depending on the wind direction, the air flow is hindered and a large air resistance is generated. When the air resistance increases, it is necessary to increase the strength of the device including the mirror plate. However, the method proposed in Patent Document 1 is not intended to install the heat collecting plate on a flow path through which natural wind blows.

  An object of the present invention is to provide a trough solar heat collecting apparatus that reduces contamination on the surface of a mirror-finished plate having a curvature.

  In order to achieve the above object, a trough solar heat collecting apparatus of the present invention includes a heat collecting pipe in which a fluid flows down in a pipe, and a mirror that has a curvature and reflects sunlight to collect and irradiate the heat collecting pipe. In the trough solar heat collecting apparatus provided with a face plate, the specular plate has a plurality of ventilation holes, and the ventilation holes are formed to penetrate from the sunlight reflecting surface of the specular plate to the back surface. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the trough type solar heat collecting device which reduces the stain | pollution | contamination of the mirror surface plate with a curvature can be provided.

It is the schematic of the trough type solar heat collecting device to which the vent hole is applied. It is the schematic of the trough type solar heat collecting device of a present Example (Example 1). It is the schematic of the trough type solar heat collecting device of a present Example (Example 2). It is the schematic of the trough type solar thermal collector of a present Example (Example 3). It is the schematic of the trough type solar heat collecting device of a present Example (Example 4). It is the schematic of the trough type solar heat collecting device of a present Example (Example 4). It is the schematic of the trough type solar heat collecting device of a present Example (Example 5). It is the schematic of the trough type solar heat collecting device of a present Example (Example 6). It is the schematic of the trough type solar heat collecting device of a present Example (Example 6). It is the schematic of the trough type solar heat collecting device of a present Example (Example 7). It is the schematic of the trough type solar heat collecting device of a present Example (Example 8). It is the schematic of the warm water production | generation plant which employ | adopted the trough type solar heat collecting device of a present Example (Example 9). It is the schematic of the cleaning mode command generation logic of the controller of a present Example (Example 9). It is the schematic of the warm water production | generation plant which employ | adopted the trough-type solar heat collecting device of a present Example (Example 10).

  The trough solar heat collecting apparatus of the present invention is provided with a plurality of vent holes penetrating the front and back of the mirror surface plate with respect to the mirror surface plate having a curvature. This vent allows air to pass from the front surface to the back surface of the mirror plate. Also, the air holes are sized so that dirt, sand particles, and the like attached to the surface of the mirror plate can pass through.

  According to the present invention, in the trough solar heat collecting apparatus, an air flow is generated from the surface of the mirror plate to the back surface of the mirror plate through the vent hole. By this air flow, dirt on the surface of the mirror plate, such as dirt and sand particles, is discharged together with air from the air vents, thereby reducing the dirt on the surface of the mirror plate. Sand can also be prevented from accumulating on a curved mirror plate.

  The trough-type solar heat collector can be continuously operated for a long time by keeping the heat recovery performance within a good range by reducing the dirt. Furthermore, by reducing dirt, it is possible to prolong the cleaning maintenance period of the specular plate that must be periodically performed, and to save labor for cleaning.

  Further, when strong wind blows on the mirror plate, it is possible to allow a part of air to pass through the vent hole, thereby reducing air resistance generated in the mirror plate.

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

  First, an outline of a trough solar heat collecting apparatus to which the present invention is applied and a basic structure common to each embodiment described later will be described with reference to FIGS. 1 (a) and 1 (b). FIG. 1A is a schematic view of a trough solar heat collecting apparatus to which a vent hole is applied. A heat collecting pipe 101 through which a heat medium heated by solar heat flows is housed in a glass transparent heat insulating tube 102 having a vacuum inside and improved heat insulating performance, and is fixed by a support leg 103. The support leg 103 is fixed to the ground. The mirror plate 104 reflects sunlight and irradiates the heat collecting pipe 101.

  Reference is now made to FIG. FIG. 1B is a cross-sectional view of a trough solar heat collecting apparatus to which a ventilation hole is applied, cut in a direction perpendicular to the axial direction of the heat collecting pipe 101. The vent hole 105 passes through the mirror plate 104, and allows air to pass from the front surface to the back surface that reflects sunlight. The surface of the mirror plate 104 has a curvature that forms a hyperbola with the one-dot chain line 106 as an axis in order to collect the reflected light on the heat collecting pipe 101. As the specular plate 104 has a smaller difference in irradiation angle between the alternate long and short dash line 106 and the sunlight 107, the reflected light concentrates on the heat collecting pipe 101.

  Returning to the description with reference to FIG. In order to maintain the curvature, the mirror plate 104 is reinforced after the shape is fixed from both ends in the axial direction by the side plate 108. The mirror plate 104 is supported by the support legs 103 in a state where the mirror plate 104 can move on the track where the focal position of the reflected light is determined by the heat collecting pipe 101. The driving device 109 drives the motor with electric power supplied from the electric wire 110 and changes and holds the position of the mirror plate 104 according to a control signal transmitted through the electric wire 110. In the present invention, a plurality of vent holes 105 are provided in the mirror plate 104, thereby making it possible to reduce contamination on the surface of the mirror plate. Each embodiment of the present invention will be described below with the above-described contents as a basic configuration.

  A first embodiment of the present invention will be described with reference to FIGS. The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 2A is a schematic view of the trough solar heat collecting apparatus to which the vent hole 105 is applied as seen from the sunlight irradiation direction.

  FIG. 2B is a schematic view in which the heat collecting pipe 101 and the transparent heat insulating pipe 102 are removed from FIG. A broken line 201 represents a center line in the axial direction of the heat collecting pipe 101. The plurality of vent holes 105 are provided so as to penetrate the mirror plate 104 along the axial direction of the heat collecting pipe 101. The vent hole 105 becomes a shadow of the heat collecting pipe 101 when the mirror face plate 104 condenses and irradiates sunlight to the heat collecting pipe 101 so as not to hinder the collection of sunlight by the mirror face board 104, and the sun. It may be provided on the projection line of the broken line 201 onto the specular plate 104 or in the vicinity thereof where the amount of reflected light is small. However, this is not necessary as long as the area of the vent hole 105 is small. Note that the effect expected by the present invention is lost when the vent hole 105 is blocked with sand particles. Therefore, in consideration of the size of the sand grains, it is desirable that the size of the air hole 105 is at least 5 mm.

  An arrow 202 indicates the air flow. The air blows away dirt such as dust and sand while flowing along the curvature on the surface of the mirror plate 104. Therefore, the vent holes 105 are preferably distributed widely in the axial direction of the heat collecting pipe 101. Due to the above distribution, the flow rate of air guided to the vent hole 105 is increased, dirt such as dust and sand particles can be effectively discharged to the back surface of the mirror plate 104, and the air resistance generated in the mirror plate 104 is easily relaxed. Is possible.

  According to the present embodiment, an air flow that flows from the front surface of the mirror surface plate 104 to the rear surface of the mirror surface plate through the vent hole 105 is generated. By this air flow, surface contamination such as dust and sand particles adhering to the surface of the mirror plate 104 is discharged together with air from the vent hole 105, so that contamination on the surface of the mirror plate can be reduced. In addition, the presence of the air holes 105 makes it possible to suppress sand from being deposited on a mirror-finished plate having a curvature.

  A second embodiment of the present invention will be described with reference to FIG. The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 3 is a schematic view of the trough solar heat collecting apparatus as seen from the direction of sunlight irradiation after removing the heat collecting pipe 101 and the transparent heat insulating pipe 102 as in FIG.

  The present embodiment is characterized in that the vent holes 105A are arranged on a plurality of straight lines parallel to the axial direction of the heat collecting pipe 101. At the time of arrangement, the vent hole 105 </ b> A is placed in a portion where the amount of light decreases due to the shadow of the heat collection pipe 101, and is set to a position that does not hinder the light collection of the heat collection pipe 101. The vent holes 105A arranged in different straight lines are arranged with their positions shifted with respect to the axial direction of the heat collecting pipe 101 with the openings overlapping each other (in FIG. 3, the vent holes 105A are arranged in two rows. In addition, an example of staggered arrangement is shown). With this arrangement method, the vent hole 105A is provided in the entire axial direction of the heat collecting pipe 101 with respect to the mirror plate 104 except for both ends (side plate 108 side) of the mirror plate 104. As a result, it is possible to discharge dirt such as dirt and sand particles more effectively than the vent hole 108 described in the first embodiment, and to easily reduce the air resistance generated in the mirror plate 104. It is.

  A third embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b). The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 4A is a schematic view of the trough solar heat collecting apparatus as seen from the direction of sunlight irradiation with the heat collecting pipe 101 and the transparent heat insulating pipe 102 removed, as in FIG. 2B.

  The present embodiment is characterized in that the long axis direction of the hole shape of the vent hole 105B is arranged at an angle with respect to the axial direction of the heat collecting pipe 101. In addition, the point provided with two or more ventilation holes 105 along the axial direction of the heat collection pipe | tube 101 is the same as that of the above-mentioned Example. At the time of arrangement, the vent hole 105 </ b> B is disposed in a portion where the amount of light decreases due to the shadow of the heat collection pipe 101, and is set to a position that does not hinder the light collection of the heat collection pipe 101.

  Reference is now made to FIG. FIG. 4B is an enlarged comparison of the vent hole 105A according to the second embodiment and the vent hole 105B according to the third embodiment. A dotted line 401 indicates the major axis of each vent hole. According to the arrangement method of the vent holes 105B according to the third embodiment, it is possible to prevent the long axis directions (dotted lines 401) of the individual vent holes in the same row from being on the same line. In the case where stress is generated in the mirror plate 104 due to the air resistance generated by the blowing of the wind and the crack has progressed, the arrangement method of the vent holes 105A of the second embodiment may cause the cracks of the respective vent holes 105A to be connected. However, according to the arrangement method of the vent holes 105B of the third embodiment, the long axes of the respective vent holes 105B are not on the same line. Therefore, the air resistance of the mirror plate 104 is compared with the arrangement method of the second embodiment. The strength against can be improved.

  The vent hole 105B arranged in the axial direction of the heat collecting pipe 101 (the direction of the broken line 201) is arranged in parallel with the major axis direction (the dotted line 401 direction) of each of the vent holes 105B, and the axis of the heat collecting pipe 101. By setting both ends of the air holes 105B adjacent to each other in the hand direction (the direction of the broken line 201) to be overlapped with each other, dirt such as dust and sand particles can be effectively discharged as in the second embodiment.

  A fourth embodiment of the present invention will be described with reference to FIGS. 5 (a), 5 (b), and 6. FIG. The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 5A is a schematic view when the vent hole 105 is penetrated at a vertical or near vertical angle with respect to the surface of the mirror plate 104. The air flow around the mirror plate 104 is formed along the direction of penetration of the vent hole 105. For this reason, in the case of the penetration method of FIG. 5A, not only the air flow on the surface of the mirror plate 104 but also the air flow indicated by the arrow 501 is generated and the surroundings of the transparent heat insulating pipe 102 in which the heat collecting pipe 101 is accommodated. It is a factor that causes up to the air flow. When the air flow around the transparent heat insulating tube 102 becomes strong, heat recovery performance may be reduced due to heat exchange between the air and the transparent heat insulating tube 102.

  On the other hand, the vent hole 105C penetration direction of the fourth embodiment of the present invention will be described with reference to FIG. The vent hole 105C of the present embodiment penetrates the surface (reflection surface) of the mirror plate 104 with an angle in the direction of curvature of the mirror plate 104 (perpendicular to the tangent to the curved surface of the mirror plate surface). By adopting such a penetration direction, the air flow changes as indicated by an arrow 501C, and causes a stronger air flow near the surface of the mirror plate 104 than in the penetration method of FIG. be able to. This can reduce the possibility that the heat recovery performance is deteriorated by heat exchange between the air and the transparent heat insulating tube 102, and also increases the effect of blowing off the surface contamination of the mirror plate 104 by the air flow.

  In addition, when the through-hole 105C penetrating direction is inclined with respect to the surface vertical direction of the mirror surface plate 104, a plurality of inclination directions of the plurality of ventilation holes 105C are shown in FIG. 6 (directions in which the inclination directions of the ventilation holes 105C are alternately different). ), It is possible to promote the generation of airflow over a wide range of the surface of the mirror plate 104.

  A fifth embodiment of the present invention will be described with reference to FIGS. As described above in the mode for carrying out the invention, a trough solar heat collecting apparatus generally includes a driving device 109 for a mirror plate 104. As shown in FIG. 7A, the position of the mirror plate 104 is adjusted so that the axial direction of curvature of the mirror plate 104 (in the direction of the alternate long and short dash line 106) and the incident angle of sunlight can be brought close to each other, thereby reflecting sunlight. The light focus position is set in the heat collecting pipe 101 to improve the heat recovery performance.

  In Example 5 of the present invention, the cleaning mode is provided as one of the operation modes of the trough solar heat collector, and when the mode is shifted to the cleaning mode, the drive device 109 causes the control command to change the mode as shown in FIG. The mirror plate 104 is vibrated, and dirt such as dust and sand particles deposited on the surface of the mirror plate 104 is shaken off. In FIG. 7B, only the outer contour lines 104A, 104B, and 104C are shown on the mirror plate 104 so that the states can be easily compared. The outline 104A is a position where the axial direction of the curvature of the mirror plate 104 is close to the incident angle of sunlight in order to improve the heat recovery performance. When the mirror plate 104 does not have the vent hole 105, dirt is removed from the outer edge of the mirror plate 104, so it is necessary to tilt the mirror plate 104 greatly. On the other hand, in the case of the present embodiment having the vent hole 105, the dirt can be discharged also from the vicinity of the center of the mirror plate 104, so that the dirt can be discharged more efficiently than when the vent hole 105 is not provided. In addition, since dirt can be discharged from the vent hole 105 without greatly tilting the mirror plate 104, the power consumed by the driving device 109 can be suppressed, which is economical.

  A sixth embodiment of the present invention will be described with reference to FIGS. 8, 9A, and 9B. The outline of the trough-type solar heat collecting apparatus is the same as that described above with reference to FIG. 1, but will be omitted. However, as shown in FIG. 8, the solar heat collecting apparatus of this embodiment is a mirror by a horizontal driving device 801 (position changing mechanism). The face plate 104 can be rotated in the horizontal direction, and the wind direction in the installation environment of the solar heat collector can be measured by the anemometer 802 and transmitted to the horizontal direction driving device 801. As shown in FIG. 9A, in the normal normal operation mode, the angle is adjusted so that the wind direction and the axial direction of the heat collecting pipe 101 are close to reduce the air resistance that the mirror plate 104 receives from the wind.

  On the other hand, when the mode is shifted to the cleaning mode, the mirror plate 104 is rotated in the horizontal direction by the horizontal direction driving device 801 as shown in FIG. The angle is adjusted so that the axial direction of the heat collecting pipe 101 shown in FIG. Thereby, the flow rate of the air sprayed on the surface of the mirror plate 104 is increased, and the effect of discharging dirt such as dust and sand particles from the vent hole 105 can be enhanced. Furthermore, the vibration function of the mirror surface plate 104 by the horizontal direction driving device 701 makes it possible to shake off dirt, sand particles, and the like accumulated on the surface of the mirror surface plate 104 from the vent hole 105. Dirt can be reduced.

  In general, trough solar heat collectors are often configured in an array. In the case of an array configuration, since the horizontal rotation has a low degree of freedom in shape of the transparent heat insulating tube, the entire array is rotated in the horizontal direction as one device. When a trough solar heat collecting device has a single structure, such as for general households, the structure shown in FIG. 7A can be adopted, and the horizontal rotational freedom is high. The effect of reducing the contamination of the face plate 104 is high.

  A seventh embodiment of the present invention will be described with reference to FIGS. 10 (a) and 10 (b). The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 10A shows a trough solar heat collecting apparatus having a ventilation hole 105, to which a discharge head 1001 is attached. The air discharge head 1001 is fixed to the mirror surface plate 104, and a blower pipe 1002 is connected thereto. The blower pipe 1002 is connected to a blower (not shown) such as a blower, and can send air to the blower head 1001. The material of the blower pipe 1002 is preferably flexible so that the mirror plate 104 is movable.

  Reference is now made to FIG. FIG. 10B is a schematic view of the air discharge head 1001 as viewed from the mirror plate 104 side. The air discharge head 1001 is provided with an air outlet 1003, and air sent from the blower pipe 1002 is blown from the air outlet 1003 to the mirror plate 104 to generate an air flow indicated by an arrow 1004. The air outlet 1003 is arranged so that the air flow spreads in the axial direction of the heat collecting pipe 101 with respect to the mirror plate 104.

  Returning to the description with reference to FIG. Normally, the blower is not driven and air is not discharged from the air outlet 1003. When shifting to the cleaning mode in order to reduce dirt on the mirror surface plate 104, the blower is driven by a control command and air is blown from the air outlet 1003. The air blown from the air outlet 1003 increases the flow rate of air blown onto the surface of the mirror plate 104, and the effect of discharging dirt such as dust and sand particles from the vent hole 105 can be enhanced. Note that it is preferable to attach the air discharge head 1001 on the side of the mirror plate 104 close to the ground. This is because the air duct 1002 can be easily routed, and dirt and sand particles adhering to the upper end of the mirror plate 104 easily flow to the vent hole 105 due to the effect of gravity. This is because dirt is likely to accumulate and the dirt can be blown away.

  Also, the timing to drive the blower to blow air is arbitrary, but for example, when applied to solar power generation for DSS (daily start and stop) operation, solar heat collection just before the plant stop in the evening By driving and blowing the blower with the excessive recovered heat of the apparatus, the surface of the specular plate 104 can be maintained in a good state for sunlight reflection every day.

  An eighth embodiment of the present invention will be described with reference to FIGS. 11 (a) and 11 (b). The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 11A is a schematic view of a trough solar heat collecting apparatus having a ventilation hole 105, wherein an electric dust collector 1101 is attached to the reflection surface side of the mirror plate. The electric dust collector 1101 is arranged in parallel with the axial direction of the heat collecting pipe 101 and is arranged near the vent hole 105. The power source branches from the driving device 109.

  In the normal operation, the electric dust collector 1101 is stopped.

  FIG. 11B is a cross-sectional view of the solar heat collector. When the mode is shifted to the cleaning mode, the power of the electrostatic precipitator 1101 is input to adsorb dirt adhering to the surface of the mirror plate 104. As shown in the figure, for example, sand particles 1102 are adsorbed, and the power is turned off again in the vicinity of the vent hole 105, so that the sand particles 1102 leave the electric dust collector 1101 and pass through the vent hole 105 to be mirrored. It is discharged to the back side of the face plate 104.

  Furthermore, by operating the mirror plate 104 by the driving device 109, the electrostatic precipitator 1101 can be brought close to a wide area on the surface of the mirror plate 104, and dirt can be adsorbed. By the above operation, dirt can be discharged more efficiently than when the electric dust collector 1101 is not provided. In this embodiment, the electrostatic precipitator 1101 is installed as a dirt adsorption mechanism. However, as an alternative mechanism, a material that does not damage the surface of the specular plate 104 such as a brush, cloth, sponge, etc. is arranged in the electric precipitator 1101 arrangement portion, It is good also as a mechanism to put in and out by on-off.

  A ninth embodiment of the present invention will be described with reference to FIGS. The outline of the trough solar heat collecting apparatus is the same as that described in FIG. FIG. 12 is a schematic view of a hot water generation plant employing the trough solar heat collecting apparatus of the present invention. The water supply tank 1201 is filled with fresh water to be heated. Fresh water is fed from the water supply pipe to the grid of the trough solar heat collector 1203 via the water pump 1202. Fresh water heated by the trough solar heat collector 1203 is stored in the hot water tank 1204 as hot water. The stored hot water is supplied via the flow rate adjustment valve 1205 every time demand is generated. A thermometer 1206 measures the temperature of hot water flowing into the hot water tank 1204, and a photometer 1207 measures the luminous intensity of sunlight irradiated to the trough solar heat collector 1203. Measurement values of the thermometer 1206 and the photometer 1207 are transmitted to the controller 1208. The controller 1208 can transmit the cleaning mode control commands described in the fifth, sixth, seventh, and eighth embodiments to the trough solar heat collectors in addition to outputting the position command of the mirror plate 104.

  FIG. 13 is a schematic diagram of the cleaning mode command generation logic of the controller 1208. A function 1301 based on an actual measurement result or calculated in advance by analysis is set in the controller 1208. The function 1301 outputs a predicted value of the hot water temperature measured by the thermometer 1206 with respect to the measurement value of the photometer 1207. . In the bias signal generator 1302, an allowable reduction amount of the hot water temperature is set. A value obtained by subtracting the output of the bias signal generator 1302 from the output of the function 1301 and the measured value of the thermometer 1206 are compared by the comparator 1303. If the measured value of the thermometer 1206 is smaller, a temporary cleaning mode command is issued. Output to the cleaning mode issuing logic 1304. The cleaning mode issuing logic 1304 generates a cleaning mode command in accordance with a schedule such as periodic cleaning. When the temporary cleaning mode command is received from the comparator 1303, the cleaning mode described in the fifth, sixth, seventh, and eighth embodiments. The cleaning mode command can be transmitted to the trough solar heat collecting apparatus 1203 to carry out the above.

  As described above, when dirt is attached to the surface of the mirror surface plate 104 and the heat recovery performance of the trough solar heat collector 1203 is lowered, a cleaning mode command is output by the function of the controller 1208 to output the trough solar heat collector 1203. Operation that improves heat recovery performance becomes possible, and a hot water generation plant with improved maintenance performance can be provided.

  A tenth embodiment of the present invention will be described with reference to FIG. The outline of the trough type solar thermal collector is shown in FIG. 1, the outline of the hot water generating plant is shown in FIG. 12, and the outline of the cleaning mode command generation logic of the controller is the same as that explained in FIG. FIG. 14 is a schematic diagram of the configuration of a trough solar heat collector of a hot water generation plant that employs the trough solar heat collector of the present embodiment.

  In this embodiment, the trough solar heat collector is grouped into a grit 1 heat collector 1401, a grit 2 heat collector 1402, and a grit N heat collector 1403. Although the grouping of the present embodiment is N sets, the number is not specified and can be freely changed according to the type of the hot water generating plant. Each grid is provided with a grit 1 thermometer 1404, a grit 2 thermometer 1405, and a grit N thermometer 1406, and the hot water temperature heated by each grit can be measured. The measured values of the grit 1 thermometer 1404, the grit 2 thermometer 1405, the grit N thermometer 1406, and the photometer 1207 are transmitted to the controller 1208. The controller 1407 can transmit the cleaning mode command described in the embodiment for each grid.

  As described above, when dirt is attached to the surface of the mirror plate 104 and the heat recovery performance of any one of the grit 1 heat collecting device 1401, the grit 2 heat collecting device 1402, and the grit N heat collecting device 1403 is deteriorated, the function of the controller 1407 Thus, the cleaning mode command is output to the corresponding grit heat collecting device, the operation for improving the heat recovery performance of the corresponding grit heat collecting device can be performed, and the hot water generating plant with improved maintenance performance can be provided.

  Since the cleaning mode command output destination can be output separately to each grid, the number of trough solar heat collectors that implement the cleaning mode can be reduced, and the amount of heat recovery performance of the hot water generation plant is reduced during the cleaning mode. Compared to Example 9, it can be reduced. Moreover, since the number of trough-type solar thermal collectors that carry out the cleaning mode is not increased more than necessary, it is possible to save power.

  In this embodiment, the grids are configured in parallel, but a series grid configuration is also applicable. In the case of a series grid configuration, the value output by the function 1301 may be changed to a predicted value of the temperature rise of hot water in each grid, and the measured temperature to be compared may be changed to the difference between the measured temperatures before and after the grid.

101 ... Heat collecting pipe, 102 ... Transparent heat insulation pipe, 103 ... Support leg, 104 ... Mirror plate,
104A ... Solid line (represents the outline of the mirror surface)
104B ... broken line (represents the outline of the surface of the mirror plate),
104C ... broken line (represents the outline of the mirror surface),
105 ... vent hole, 105A ... vent hole, 105B ... vent hole, 105C ... vent hole,
106 ... alternate long and short dash line (representing the hyperbolic axis of the mirror surface curvature), 107 ...
108 ... side plate, 109 ... driving device, 110 ... electric wire 201 ... broken line (represents the axial line in the axial direction of the heat collecting pipe),
202 ... arrow (representing air flow),
401... Dotted line (represents major axis direction of each vent hole)
501 ... Arrow (represents air flow), 501C ... Arrow (represents air flow)
801 ... Horizontal direction driving device, 802 ... Anemometer 901 ... Arrow (represents wind direction)
1001 ... Ventilation head, 1002 ... Blower pipe,
DESCRIPTION OF SYMBOLS 1003 ... Arrow (representing the flow of the air ventilated), 1004 ... Air vent 1101 ... Electric dust collector, 1102 ... Sand grain 1201 ... Water supply tank, 1202 ... Water supply pump,
1203 ... Trough solar collector, 1204 ... Hot water tank,
1205 ... Flow control valve, 1206 ... Thermometer,
1207 ... Photometer, 1208 ... Controller 1301 ... Function, 1302 ... Bias signal generator, 1303 ... Comparator,
1304 ... Cleaning mode issuing logic 1401 ... Grit 1 heat collector, 1402 ... Grit 2 heat collector,
1403 ... Grit N heat collector, 1404 ... Grit 1 thermometer,
1405 ... Grit 2 thermometer, 1406 ... Grit N thermometer,
1407 ... Controller

Claims (16)

A heat collecting pipe through which the fluid flows down the pipe;
In the trough type solar heat collecting apparatus comprising a mirror plate having a curvature and reflecting the sunlight to collect and irradiate the heat collecting pipe,
The mirror surface plate has a plurality of ventilation holes, and the ventilation holes are formed so as to penetrate from the sunlight reflecting surface to the back surface of the mirror surface plate. . The trough solar heat collecting apparatus according to claim 1,
The trough solar heat collecting apparatus, wherein the ventilation hole is arranged in a portion which is a shadow of the heat collecting pipe when the mirror plate is collecting and irradiating sunlight on the heat collecting pipe. The trough solar heat collecting apparatus according to claim 1,
The trough solar heat collecting apparatus, wherein the ventilation holes are arranged in a plurality of lines in a straight line along the axial direction of the heat collecting pipe. In the trough type solar heat collecting device according to claim 1 or 2,
The trough solar heat collecting apparatus according to claim 1, wherein the ventilation hole has an elongated hole shape in one direction, and the major axis direction of the hole shape is arranged at an angle with the axial direction of the heat collecting pipe. In the trough type solar heat collecting device according to any one of claims 1 to 4,
The trough-type solar heat collector characterized in that the through-hole direction of the ventilation hole has an angle with respect to the vertical direction of the solar light reflecting surface of the specular plate as viewed from the axial direction of the heat collecting pipe. apparatus. FIG.
In the trough type solar heat collecting apparatus according to claim 5,
The trough solar heat collecting apparatus characterized in that the plurality of ventilation holes have a plurality of types of through-hole penetration directions. In the trough type solar heat collecting device according to any one of claims 1 to 6,
A trough-type solar heat collecting apparatus, comprising: a driving device that drives the mirror plate to be rotatable in the axial rotation direction of the heat collecting pipe and vibrates the mirror plate. In the trough type solar heat collecting device according to any one of claims 1 to 6,
A position changing mechanism capable of rotating the mirror plate in a horizontal direction with the solar heat collector installation surface, and a wind direction measuring means for the solar heat collector installation location,
A trough solar heat collecting apparatus, wherein the mirror plate is directed in a wind direction by the position changing mechanism. The trough solar heat collecting apparatus according to claim 8,
The said position change mechanism has a function which vibrates the said mirror-surface plate, The trough type solar heat collecting device characterized by the above-mentioned. In the trough type solar heat collecting device according to any one of claims 1 to 6,
A trough-type solar heat collecting apparatus comprising a discharge head for blowing air to a sunlight reflecting surface of the mirror plate. The trough solar heat collecting apparatus according to claim 10,
The trough solar heat collector, wherein the installation position of the air discharge head is on the lower end side of the mirror plate near the installation surface of the solar heat collector. The trough solar heat collecting apparatus according to claim 10 or 11,
A solar heat collecting apparatus applied to a solar thermal power plant operated by DDS, wherein the discharge head is driven by power generation of surplus recovered heat before the solar thermal power plant is stopped. Solar heat collector. The trough solar heat collecting apparatus according to claim 8,
A trough solar heat collecting apparatus, wherein an electric dust collector is attached to the reflecting surface side of the mirror plate. The trough solar heat collecting apparatus according to claim 8,
A trough solar heat collecting apparatus having a mechanism for bringing a brush, cloth, or sponge into contact with a mirror plate surface. The trough solar heat collecting apparatus according to any one of claims 7 to 14,
A temperature measurement function of a heating object in the heat collecting pipe;
While having the solar radiation photometric measurement function of the solar heat collector installation location,
The operation mode includes a cleaning mode of the mirror plate,
A trough solar heat collecting apparatus having a function of shifting to the cleaning mode based on the temperature measurement function and a measurement value obtained by a solar irradiation light intensity measurement function in the previous period. The trough solar heat collecting apparatus according to claim 15,
There are a plurality of solar heat collectors,
The solar thermal collector is classified into a plurality of grids,
A function for measuring the temperature of the heating object in the heat collecting pipe for each grid,
A trough solar heat collecting apparatus having a function of shifting to the cleaning mode for each grit based on the temperature measurement function and a measurement value obtained by the solar light intensity measurement function in the previous period.