WO2013083050A1 - Solar thermal power generation system - Google Patents

Abstract

Provided is a solar thermal power generation system, comprising a heliostat (22) for reflecting and focusing sunlight and a heat collector (5) for absorbing sunlight energy. The heat collector is arranged on a supporting device and is moveable and/or rotatable with respect to the supporting device. The supporting device may be a support (13)-crossbeam (6) structure, an oblique column or an upright column. With the solar thermal power generation system, the sunlight collection efficiency can be improved by moving the heat collector, assembly or maintenance can be carried out more conveniently by moving the heat collector up and down and/or rotating the heat collector, and the heliostat can be arranged under the heat collector, thereby improving the overall power generation efficiency of the whole mirror field.

Description

 Solar thermal power generation system

Technical field

 The present invention relates to the field of solar thermal power generation technology, and more particularly to a structure for providing a heat collector in a tower solar thermal power generation system.

Background technique

 As a fossil fuel alternative energy, solar energy is currently receiving more and more attention. Among them, solar energy CSP technology is considered to be one of the main reliances on human energy demand in the future due to its environmental friendliness and easy connection with existing power grids.

 A typical solar thermal power generation system includes a mirror field in which a plurality of heliostats are provided for reflecting sunlight to a focus position of the mirror field. A support tower is arranged in the mirror field for supporting the heat collector, so that the heat collector is located at the focus position of the mirror field, so as to receive the sunlight reflected by the heliostat, and convert the received sunlight into heat energy, and transmit it to the worker. Quality, driving power generation, generating electricity.

 Industrial application grade solar thermal power generation systems generally include hundreds or even thousands of heliostats. In order to allow the sunlight reflected by these heliostats to reach the collector unimpeded, it is generally necessary to set the collectors in the mirror field. The middle distance is tens of meters or even hundreds of meters high. Those skilled in the art will appreciate that at such a high location, coupled with the complex structure of the collector itself and numerous auxiliary equipment, the installation and maintenance of the collector is complicated. And because the collector is located at the optical focus of the mirror field, the large amount of solar energy that is concentrated poses a serious threat to the safety of maintenance personnel.

In addition, the focus position with the highest light collection efficiency in the mirror field is different at different times of the day. In order to achieve the highest light collection efficiency, a technical solution has been proposed in which a plurality of collectors supported by the support tower are arranged in the mirror field, and different sets of heliostats in the mirror field are assigned to different sets in different time periods. The heater reflects the sunlight. This solution not only requires the installation of multiple collectors and collector towers, but also on the mirror field. The control of thousands of heliostats has also become complicated.

Summary of the invention

 In order to solve the above problems, the present invention proposes a novel solar thermal power generation system which can facilitate the installation and maintenance of the collector and improve the safety of the installation and maintenance personnel.

 The object of the invention is achieved by the following technical solutions:

 A solar thermal power generation system comprising a heliostat for reflecting and focusing sunlight and a heat collector for absorbing solar energy, the collector being disposed on the support device and capable of being opposite to the support device Move and / or rotate.

 The collector is capable of absorbing heat at any position that can be rotated or moved to and from.

 Further, the supporting device has a suspension structure, and the heat collector is disposed on the supporting device by suspension, and is movable and/or rotatable relative to the supporting device, including moving up and down and moving in the direction of the beam.

 Further, a wind deflector with an adjustable angle and a windshield area is installed beside the heat collector for reducing the influence of air flow on the heat absorption of the heat collector.

 As a preferred solution, the supporting device comprises a bracket and a beam, the beam is a cantilever beam or a simply supported beam with respect to the bracket, and the heat collector is mounted on the beam.

 Further, the beam is movable up and down with respect to the bracket; the bracket is provided with a device for driving the beam to move up and down, and a driver for driving the device to move relative to the bracket; Tube or rail.

 Further, the beam is rotatable relative to the bracket about at least one axis; the bracket is provided with a device for driving the beam to rotate, and a driver for driving the device to rotate relative to the bracket; Casing or rotating platform

As another preferred solution, the supporting device may be a tilting column. Further, the heat collector is suspended on the inclined column and is movable along the inclined column. Further, the tilting column is rotatable about at least one axis.

 As another preferred solution, the supporting device is an upright column.

 Specifically, the means for driving the collector to move up and down includes a motor, a winch driven by the motor, a wire rope connected to the winch and the heat collector, and a pulley unit.

 In particular, the support device is provided with a diagonal beam or a stay cable for maintaining stability.

 In particular, a high temperature protection structure is provided on the support device and/or other device adjacent to the heat collector. The protective structure is a high temperature resistant coating or a high temperature resistant protective sheet.

 In particular, the piping system of the solar thermal power generation system is provided with means for steering the pipeline; the means for deflecting the pipeline is a pipe joint or a bellows.

 In the solar photovoltaic power generation system of the present invention, the support device is formed by a combination of a bracket and a beam, or a tilting column or a vertical column, and there is no support tower below the heat collector, so that the air is released. More heliostats can be placed on the ground to increase the reflection efficiency of the amount of solar energy in the mirror field.

 By causing the beam itself to rotate or move up and down or to move and/or rotate the collector relative to the beam, the position of the collector in the mirror field can be moved, so that the collector can be different in one day. The time period follows the spatial position with the highest light collection efficiency, thereby improving the solar light collection efficiency and simplifying the prior art heliostat control scheme.

 According to the above technical solution of the present invention, the up and down movement of the heat collector relative to the supporting device can not only overcome the shortcomings of the prior art installation and maintenance work of the heat collector, but also improve the safety of the installation and maintenance work.

DRAWINGS

 The invention will now be described in further detail with reference to the drawings and embodiments.

1 is a heat collector and a supporting device thereof according to Embodiment 1 of the present invention; Figure 2 is a cross-sectional view of the collector support device of the first embodiment;

 3 is a schematic diagram of Embodiment 2 of the present invention;

 4 is a schematic diagram of Embodiment 3 of the present invention;

 Figure 5 is a schematic view of Embodiment 4 of the present invention;

 Figure 6 is a schematic view of Embodiment 5 of the present invention;

 Figure 7 is a schematic view of Embodiment 6 of the present invention;

 FIG. 8 is a schematic diagram of a specific application of the solar thermal power generation system according to the present invention.

 In the picture:

 1, winch; 2, working fluid import; 3, working fluid export; 4, flange; 5, collector; 6, beam; 7, pulley one; 8, wire rope; 9, wire rope two; 11, fixed bracket; 12, connecting device; 13, bracket; 14, flange; 15, motor; 16, windshield; 17, drive device; 18, auxiliary bracket; 19, protruding platform; 20, inclined column; 21, stay cable; 22, heliostat; 23, pipe joints; 24, hydraulic cylinder; 25, rotating platform.

detailed description

 Embodiment 1:

 As shown in Fig. 1 and Fig. 2, a structural view of a heat collector and a supporting device thereof in an embodiment of the solar thermal power generation system of the present invention is shown.

 In practical applications, the bracket 13 is fixed to the ground, and the beam 6 is mounted on the bracket 13 such that one or both arms extend from the bracket toward the surrounding space to form a cantilever beam. This embodiment shows the case of having two arms, and those skilled in the art will readily understand that there may be only one arm depending on the installed capacity of the system and other parameters.

Fig. 2 is a cross-sectional view showing the above-described collector supporting device for explaining the working principle of the supporting device. The heat collector 13 is provided with a connecting device 12 for engaging and fixing with the beam 6, the heat collector 13 An adjustable direction windshield 16 is mounted on the side for reducing the effect of air flow on the heat absorption of the collector 13.

 The beam 6 is set on the bracket 13 and can be moved up and down. The beam 6 is connected to the 8-wire end of the wire rope, and the other end of the wire rope 8 is connected to the winch 1 disposed at the bottom of the bracket, and is driven by the winch 1 to realize the beam. The up and down movement of 6 can be fixed by attaching a fixing bracket 11 underneath when it is not moving.

 The heat collector 13 is connected with a wire rope 2, and the other end of the wire rope 9 is connected to a winch 1 disposed at the bottom of the bracket. The winch 1 is driven by the motor 15, and the motor 15 can be controlled to realize the forward or reverse rotation of the winch 1. The wire rope 2 9 lifts the heat collector 5 from the ground to the beam 6, or descends from the beam 6 to the ground for easy installation and maintenance.

 The working fluid inlet 2 and the working fluid outlet 3 are used to connect the collector 5 and an external driving device, and the energy absorbed by the collector can be transmitted to the steam turbine for power generation. In operation, the heliostat emits sunlight to the heat collector 5, and the collector 5 absorbs the sunlight energy and heats the working medium therein. The working medium may be a gas for driving the steam turbine, and is heated in the heat collector 5 , Follow the working fluid outlet 3 to the steam turbine, drive the steam turbine to work, and the working fluid after work is recycled to the collector and reheated along the working fluid inlet 2 .

 Also shown in Fig. 2 are pulleys 7 and 10 for wire rope guiding, flanges for line connection 4 and

14.

 Embodiment 2:

 As shown in FIG. 3, a second embodiment of the solar thermal power generation system of the present invention is shown. In this embodiment, the beam 6 is in the form of a simply supported beam, which is supported on the brackets 13 at both ends. A corresponding driving device 17 is mounted on the beam 6, so that the collector 5 can be easily moved longitudinally along the beam 6, so that when the beam 6 is stationary, the position of the collector 5 in the space can be adjusted longitudinally along the beam 6 to Follow the point where the light collection efficiency is highest in the mirror field.

Embodiment 3: As shown in Fig. 4, a third embodiment of the solar thermal power generation system of the present invention is shown. In this embodiment, the bracket 13 is in the form of a vertical column, and the beam 6 is in the form of a cantilever beam, which can be driven. The device 17 rotates around the bracket 13 and moves up and down. The heat collector 13 is suspended and mounted on the beam 6. Under the action of the hoist, it can move up and down with respect to the beam, and can stay in any position that can be rotated or moved to. Heat; The piping system of the solar thermal power generation system is provided with a device for steering the pipe. This embodiment uses the pipe joint 23, and can also be realized by a bellows according to the site conditions.

 Embodiment 4:

 As shown in Fig. 5, a fourth embodiment of the solar thermal power generation system of the present invention is shown. In this embodiment, the beam 6 is rotatable about the bracket 13, and an auxiliary bracket 18 is provided, corresponding to the auxiliary bracket 18. A protruding platform 19 is disposed at a working height of the beam 6; one end of the beam 6 is fitted on the bracket 13 and the other end is supported on the protruding platform 19. As to the specific manner in which the beam 6 is moved up and down, those skilled in the art can have many implementations in accordance with the principles of the present invention. For example, a sleeve that can be moved up and down can be provided on the outside of the bracket 13, and the beam 6 is connected to the sleeve. In this way, when the casing is driven up and down in a certain way, the beam can also move up and down with the casing.

 In this case, in conjunction with the longitudinal movement of the collector 5 along the longitudinal direction of the beam, the position of the collector in the mirror field can be adjusted in two dimensions, thereby more accurately tracking the point where the light collecting efficiency is highest, and improving the overall light collecting efficiency.

 Embodiment 5:

As shown in FIG. 6, a fifth embodiment of the solar thermal power generation system of the present invention is shown. This embodiment can be regarded as a modified tower solar thermal power generation system in which an upright support tower is Instead of the bracket with two inclined columns 20, the entire bracket is fixed with a stay cable 21 for stability.此种With this scheme, when the collector 5 needs to be installed or repaired, it can be directly lowered from the working position on the inclined column 20 to the maintenance position, or can be tilted along the inclined column 20 to the maintenance position, to be installed or After the repair is completed, move back to the working position. Those skilled in the art can understand that the solution is also effective in overcoming the defects of the inconvenience of installation and maintenance of the collector in the prior art, and improves the efficiency of solar energy collection in the mirror field.

 Example 6:

 As shown in Fig. 7, a sixth embodiment of the solar thermal power generation system of the present invention is shown. In this embodiment, a tilting column 20 is used to articulate with the rotating platform 25, and the hydraulic cylinder 24 is used. Supporting, and extending the length of the inclined column 20 by the extension of the hydraulic cylinder 24, combined with the lifting and lowering of the collector 5 itself, finally realizes the positional change of the collector 5.

 FIG. 8 is a schematic diagram of a specific application of the solar thermal power generation system according to the present invention. In this application example, a plurality of heliostats 22 and collectors 5 are provided. By using the bracket 13 of the present invention to cooperate with the mounting structure of the beam 6, it is no longer necessary to provide a collector tower in the mirror field, so that heliostats can be arranged under the collector, thereby improving the overall set of the mirror field. Light efficiency.

 When maintenance or maintenance of one or some of the collectors 5 is required, the collector 5 can be lowered from the beam 6 to facilitate maintenance and assembly work. It is also possible to move the heat collector 5 longitudinally along the beam 6, so that the heat collector maintenance and assembly work position can be set more freely, thereby making the maintenance and assembly work easier.

 In this application, the collector 5 can be moved longitudinally along the beam 6, and combined with the rotation of the beam 6 around the bracket 13, the position of the collector 5 can be more accurately tracked in the position of the light collecting efficiency in the mirror field, thereby improving Light collection efficiency.

 In any of the foregoing embodiments, in order to stabilize the bracket and avoid falling down in the event of an accident such as a strong wind, a reinforcing structure such as a stay cable, a diagonal stay beam, or the like between the bracket and the ground may be provided.

In addition, in order to protect the portion of the beam adjacent to the collector from the concentrated high-energy solar beam and the high temperature damage of the collector, a protective layer such as a high temperature resistant ceramic may be provided on the portion of the beam adjacent to the collector. In the fourth embodiment, the collector is suspended from the inclined column of the bracket, so the high temperature resistant ceramic is also It should be placed on the inclined column accordingly to protect the tower arm from high temperature damage.

 Of course, other components may also be included. For example, in the embodiment in which the beam is simply supported, when the beam is lowered to the ground, the bracket lacks a supporting structure and may become less stable. A fixed beam can then be placed between the two supports for supporting the support after the movable beam has been lowered. Those of ordinary skill in the art are technical solutions that are easily associated with the above description, and are not described herein again.

 The technical principles of the present invention have been described above in connection with specific embodiments. The descriptions are only intended to explain the principles of the invention and are not to be construed as limiting the scope of the invention. Based on the explanation herein, those skilled in the art will be able to contemplate other specific embodiments of the present invention without departing from the scope of the invention.

Claims

Claim  A solar thermal power generation system, comprising: a heliostat for reflecting and focusing sunlight, and a heat collector for absorbing solar energy, wherein the collector is disposed on the support device, and It is movable and/or rotatable relative to the support device.  2. The solar thermal power generation system according to claim 1, wherein: the support device has a suspension structure, and the heat collector is disposed on the support device by suspension, and is movable relative to the support device. And / or turning, including moving up and down and moving in the direction of the beam.  3. The solar thermal power generation system according to claim 1, wherein: a wind deflector having an adjustable angle and a windshield area is installed beside the heat collector for reducing air flow. The effect of the heat absorption of the collector.  4. The solar thermal power generation system according to claim 1, wherein: the supporting device comprises a bracket and a beam, the beam is a cantilever beam or a simply supported beam with respect to the bracket, and the collector is mounted on the beam. on.  The solar thermal power generation system according to claim 1, wherein the supporting device is a tilting column.  6. The solar thermal power generation system according to claim 1, wherein: said support device is an upright column.  7. The solar thermal power generation system according to claim 4, wherein: the beam is movable up and down with respect to the bracket.  8. A solar thermal power generation system according to claim 4 wherein: said beam is rotatable about at least one axis relative to said bracket.  9. The solar thermal power generation system according to claim 5, wherein: said heat collector is suspended on said inclined column and movable along said inclined column. 10. The solar thermal power generation system according to claim 5, wherein: said tilting Claim The column is rotatable about at least one axis.  11. A solar thermal power generation system according to any of the preceding claims, wherein: said collector is capable of absorbing heat at any position that can be rotated or moved to and from.  12. A solar thermal power generation system according to claim 7, wherein: said bracket is provided with means for driving the beam to move up and down, and a drive for driving said device to move relative to the bracket.  13. A solar thermal power generation system according to claim 12, wherein: the means for moving the beam up and down is a sleeve or a slide rail.  14. A solar thermal power generation system according to claim 8, wherein: said bracket is provided with means for driving the beam to rotate, and a driver for driving said device to rotate relative to the bracket.  15. A solar thermal power generation system according to claim 14, wherein: the means for rotating the beam is a sleeve or a rotating platform.  16. A solar thermal power generation system according to any one of claims 1 to 15, wherein: means for driving said collector to move up and down comprises a motor, a winch driven by the motor, and a winch and said heat collecting Wire rope and pulley unit connected.  17. A solar thermal power generation system according to any one of claims 1 to 15, wherein: said support means is provided with a diagonal beam or stay cable for maintaining stability.  18. A solar thermal power generation system according to any one of claims 1 to 15, wherein a high temperature protection structure is provided on the support means and/or other means adjacent to the heat collector.  The solar thermal power generation system according to claim 18, wherein the protective structure is a high temperature resistant coating or a high temperature resistant protective sheet. 20. A solar thermal power generation system according to any one of claims 1 to 15, wherein: the duct system of the solar thermal power generation system is provided with means for steering the duct. WO 2013/083050 4_ _π ^, . τττ _ PCT/CN2012/085990  Claims  21. A solar thermal power generation system according to claim 20, wherein: said means for deflecting the conduit is a pipe joint or a bellows.