Protective device of heat absorber

Abstract

The invention relates to the tower type solar power generation technology, and discloses a protection device of a heat absorber, the protection device comprises a plurality of protection assemblies and a shielding monitoring mechanism, each protection assembly comprises a protection cloth and a protection cloth control mechanism, and the protection cloth control mechanism is used for unfolding or folding the protection cloth. The multiple protection assemblies are annularly and circumferentially arranged along the peripheral side of a heat absorption pipe fitting of the heat absorber, when protection cloth of all the protection assemblies is in an unfolded state, all the protection cloth is matched to form a protection cover used for wrapping the peripheral side of the heat absorption pipe fitting, and the shielding monitoring mechanism is electrically connected with all the protection cloth control mechanisms. The protection cloth is independently controlled to be unfolded or folded according to sunlight shielding information and / or cloud shielding information, in the process that the heat absorption pipe fitting recovers work, solar energy direct radiation is fully utilized for power generation, time and energy consumption needed by preheating of the tower type heat absorber are reduced, the stability and economic benefits of the whole system are improved, and the energy-saving and environment-friendly effects are achieved. And the overall safety and reliability of the system are enhanced.

Description

Technical Field

[0001] The invention relates to a tower solar power generation technology, in particular to a protective device for a heat absorber. Background Art

[0002] The tower-type solar thermal power generation system focuses sunlight onto the receiver through heliostats to heat molten salt and other working fluids to generate steam to drive the turbine generator to generate electricity. However, the instability of light caused by cloud cover not only affects the power generation efficiency of the system, but also threatens the safety and service life of the receiver. Specifically, when clouds suddenly block sunlight, the receiver will experience drastic temperature changes. Such frequent temperature fluctuations may cause material fatigue, shorten equipment life, and in extreme cases, may cause molten salt to solidify, causing system failures or safety accidents.

[0003] To solve these problems, some current tower-type solar thermal power stations increase the flow rate of working fluid inside the absorber when there is short-term cloud cover, in order to prevent the molten salt from solidifying and reduce the impact of sudden temperature changes. At the same time, an electric heating system is set up as a backup. However, for long-term cloud cover, the existing method can only adopt a salt withdrawal strategy, which is not only complicated but also costly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a protective device for a heat absorber, which can effectively isolate the heat absorption pipes and reduce heat loss. During the recovery process of the tower heat absorber, the time and energy consumption required for preheating the tower heat absorber can be reduced, the stability and economic benefits of the entire system can be improved, and the overall safety and reliability of the system can be enhanced.

[0005] The present invention provides a protective device for a heat absorber, comprising a plurality of protective components and a shielding monitoring mechanism, wherein the protective components comprise a protective cloth and a protective cloth control mechanism, wherein the protective cloth control mechanism is used to unfold or retract the protective cloth, wherein a plurality of the protective components are arranged in an annular circumferential direction along the outer peripheral side of a heat absorbing pipe of the heat absorber, wherein when the protective cloth of each protective component is in an unfolded state, each protective cloth cooperates to form a protective cover for wrapping the outer peripheral side of the heat absorbing pipe, wherein the shielding monitoring mechanism is used to monitor sunlight shielding information and / or cloud shielding information of the heat absorbing pipe, and wherein the shielding monitoring mechanism is electrically connected to each protective cloth control mechanism so as to be suitable for individually controlling the unfolding or retraction of each protective cloth according to the sunlight shielding information and / or the cloud shielding information.

[0006] Preferably, the heat absorber further includes an upper header and a lower header, the heat absorption pipe fittings are arranged between the upper header and the lower header, each of the protective components is arranged on the upper header, and the protective cloth control mechanism is used to unfold the protective cloth toward the lower header.

[0007] Preferably, electromagnets are arranged opposite to each other at the edges between adjacent protective cloths, and when the electromagnets are powered on, the adjacent electromagnets attract each other so that the edges of the adjacent protective cloths are closed to each other.

[0008] Further preferably, the device also includes an electromagnetic control mechanism, which is electrically connected to the electromagnet and the protective cloth control mechanism, and the electromagnetic control mechanism is configured to obtain the deployment or retraction status information of each protective cloth to control the power supply of the electromagnet between adjacent protective cloths in the deployed state.

[0009] Further preferably, the electromagnet is a flexible electromagnet.

[0010] Preferably, the protective cloth is a roller curtain type protective cloth, the protective cloth control mechanism includes a reel and a driving component, the protective cloth is rolled up on the reel, and the driving component is suitable for driving the reel to rotate relative to the upper collecting box to drive the protective cloth to unfold or retract.

[0011] Further preferably, the driving component includes a motor and a crown wheel and a driving wheel respectively arranged at both ends of the motor, the driving wheel is installed inside the reel, and the crown wheel is installed at one end of the reel.

[0012] Preferably, a drooping rod is installed at one end of the protective cloth close to the lower header when the protective cloth is unfolded, and the drooping rod is pressed on the lower header when the protective cloth is in the unfolded state.

[0013] Preferably, the obstruction monitoring mechanism includes a photosensitive sensor element, and the photosensitive sensor element is provided at the obstruction position of each protective component corresponding to the heat absorbing tube. The obstruction monitoring mechanism is configured to monitor the photosensitive signal of the obstruction position of each protective component corresponding to the heat absorbing tube, so as to be suitable for individually controlling the deployment or retraction of each protective cloth according to the photosensitive signal.

[0014] Preferably, the shading monitoring mechanism comprises a sunlight angle analysis module, and the sunlight angle analysis module is suitable for obtaining the relative position of the sun and the heat absorbing tube to obtain the sunlight shading information.

[0015] Through the above technical scheme, the present invention provides a protective device for a heat absorber, comprising a plurality of protective components and a shielding monitoring mechanism, wherein the protective components comprise a protective cloth and a protective cloth control mechanism, wherein the protective cloth control mechanism is used to unfold or retract the protective cloth, wherein the plurality of protective components are arranged in an annular circumferential direction along the outer peripheral side of the heat absorbing pipe of the heat absorber, wherein when the protective cloth of each protective component is in an unfolded state, each protective cloth cooperates to form a protective cover for wrapping the outer peripheral side of the heat absorbing pipe, and the shielding monitoring mechanism is used to monitor the sunlight shielding information and / or cloud shielding information of the heat absorbing pipe. The shielding monitoring mechanism is electrically connected to each of the protective cloth control mechanisms, so as to be suitable for individually controlling the deployment or retraction of each of the protective cloths according to the sunlight shielding information and / or the cloud shielding information, effectively isolating the heat absorbing pipe from the low temperature and high wind speed environment outside during the cloud shielding period, and utilizing the protective cloth to reduce heat loss; when the cloud shielding disappears, the protective cloth is quickly covered, and in the process of the heat absorbing pipe resuming work, full use is made of direct solar radiation to generate electricity, thereby reducing the time and energy consumption required for preheating the tower heat absorber, improving the stability and economic benefits of the entire system, and enhancing the overall safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a protective device disclosed in an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the arrangement of the protection components disclosed in one embodiment of the present invention; Figure 3 It is a structural schematic diagram of a tower heat absorber in the prior art; Figure 4 It is a schematic diagram of the structure of unfolding the protective cloth disclosed in one embodiment of the present invention; Figure 5 yes Figure 1 Exploded diagram of Figure 6 It is a schematic diagram of the structure of a driving component disclosed in an embodiment of the present invention.

[0017] Description of Reference Numerals 1. Heat absorber; 1-1. Lower header; 1-2. Upper header; 1-3. Heat absorbing pipe fittings; 2. Protection assembly; 3. Protection cloth control mechanism; 301. Reel; 302. Crown wheel; 303. Motor; 304. Driving wheel; 4. Protection cloth; 5. Driving rod; 6. Support frame; 7. Fixed frame; 8. Driving shaft; 9. Needle roller; 10. Electromagnet; 11. Tail plug. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0019] The present invention provides these embodiments to make the present invention thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, rather than as limiting.

[0020] It should be noted that, in the description of the present invention, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0021] In addition, the words "multiple", "at least one" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly perpendicular, but is within the tolerance range. "Parallel" is not strictly parallel, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0022] It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0023] All terms used in the present invention have the same meanings as those understood by ordinary technicians in the field to which the present invention belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0024] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0025] The present invention provides a protective device for a heat absorber, see Figure 1 and Figure 2 , including multiple protection components 2 and a shielding monitoring mechanism, the protection components 2 include a protection cloth 4 and a protection cloth control mechanism 3, the protection cloth control mechanism 3 is used to unfold or retract the protection cloth 4, the multiple protection components 2 are arranged in a circular circumferential direction along the outer peripheral side of the heat absorbing pipe 1-3 of the heat absorber 1, when the protection cloth 4 of each protection component 2 is in an unfolded state, each protection cloth 4 cooperates to form a protection cover for wrapping the outer peripheral side of the heat absorbing pipe 1-3, the shielding monitoring mechanism is used to monitor the sunlight shielding information and / or cloud shielding information of the heat absorbing pipe 1-3, the shielding monitoring mechanism is electrically connected to each protection cloth control mechanism 3, so as to be suitable for individually controlling each protection cloth 4 to unfold or retract according to the sunlight shielding information and / or cloud shielding information, the protection cloth 4 Ceramic fiber cloth or high-silica fiber cloth, etc., are selected as the protective cloth 4 according to the usage situation. The heat-absorbing pipe is effectively isolated from the external environment during cloud cover or sunlight cover, and the protective cloth 4 is used to reduce heat loss. When the cover disappears, the protective cloth 4 is retracted, and the direct solar radiation is fully utilized to generate electricity during the process of the heat-absorbing pipe resuming work, thereby reducing the time and energy consumption required for preheating the tower heat absorber, improving the stability and economic benefits of the entire system, and enhancing the overall safety and reliability of the system. In addition, it has stronger adaptability in the case of fluctuations in direct solar radiation, can extend the circulation time of the molten salt of the tower heat absorber working fluid, reduce the number of salt withdrawals, and enhance the continuity of the heat absorber operation.

[0026] The protective device provided by the present invention can be applied to various forms of heat absorbers, especially tower heat absorbers. In the following specific embodiments, the structure and function of the protective device are described by taking the tower heat absorber as an example.

[0027] Regarding the information of sunlight blocking and cloud blocking, it should be noted that sunlight blocking refers to the situation where any non-cloud factors prevent direct sunlight from directly irradiating the tower heat absorber. Cloud blocking refers to the phenomenon of sunlight intensity fluctuation caused by clouds, that is, clouds block sunlight, causing changes in the amount of solar radiation reaching the ground. Cloud blocking is a dynamic and random process. Monitoring can be achieved through optical sensors, weather radars, satellite image analysis and machine learning algorithms. Optical sensors use high-precision optical sensors to monitor sky conditions in real time and capture information such as the speed, thickness and coverage of cloud movement. Weather radars use weather radars to obtain the distribution of clouds in a larger range and warn of upcoming large-scale cloud blocking events in advance. Satellite image analysis uses high-definition cloud images provided by earth observation satellites to track and predict clouds at a macro level. Machine learning algorithms combine historical data and real-time monitoring results, and apply machine learning algorithms to predict cloud blocking trends to improve the response speed and accuracy of the system. Machine learning algorithms are existing technologies and will not be discussed in detail here.

[0028] In order to effectively deal with sunlight shading and cloud shading, the tower solar thermal power station is equipped with a special shading monitoring mechanism. The mechanism can integrate the above two sources of information, through real-time monitoring and analysis of sunlight shading information and cloud shading information, and intelligently control the deployment or retraction of the protective cloth 4 to ensure that the tower device is in the best working condition.

[0029] In some embodiments, see Figure 3 The heat absorber 1 also includes an upper header 1-2 and a lower header 1-1. The heat absorbing pipe 1-3 is arranged between the upper header 1-2 and the lower header 1-1. Each protective component 2 is arranged on the upper header 1-2. The protective cloth control mechanism 3 is used to unfold the protective cloth 4 in the direction close to the lower header 1-1. The upper header 1-2 is located at the top of the tower heat absorber and is used to collect sunlight reflected from the heliostat and transfer heat to the internal working fluid (such as molten salt). The upper header 1-2 also serves as a connection point to support multiple protective components 2. The lower header 1-1 is located at the bottom of the tower heat absorber and is connected to the upper header 1-2 through the heat absorbing pipe 1-3. The lower header 1-1 is mainly responsible for receiving the heat conducted from the upper header 1-2 and transferring it to the subsequent heat exchange system or heat storage system. The heat absorbing pipe 1-3 is arranged between the upper header 1-2 and the lower header 1- 1, forming the main heat exchange path of the tower heat absorber. High-temperature working fluid flows inside the heat absorbing pipe 1-3. After absorbing solar radiation, the temperature rises, thereby realizing energy conversion. The protective cloth control mechanism 3 is installed on the upper header 1-2, and is responsible for automatically unfolding or retracting the protective cloth 4 toward the direction close to the lower header 1-1 according to the information provided by the shielding monitoring mechanism. When unfolded, the protective cloth 4 moves downward along a predetermined path, completely or partially covering the surrounding side of the heat absorbing pipe 1-3, forming an effective protective cover, and reducing the heat loss of the heat absorbing pipe 1-3.

[0030] In some embodiments, see Figure 4 Electromagnets 10 are arranged relatively at the edges between adjacent protective cloths 4. When the electromagnets 10 are energized, adjacent electromagnets 10 attract each other so that the edges of adjacent protective cloths 4 are closed to each other. The electromagnets 10 are embedded in or attached to the inside or outside of the protective cloth 4 and are arranged along the length direction of the protective cloth 4. The physical attraction provided by the electromagnets 10 enhances the sealing between the edges of adjacent protective cloths 4, which is beneficial for the edges of each protective cloth 4 to be tightly closed when they are unfolded, forming a complete, seamless protective cover, which is beneficial for reducing the heat loss of the heat-absorbing pipe fittings 1-3.

[0031] In some embodiments, the protective device further comprises an electromagnetic control mechanism, which is electrically connected to the electromagnet 10 and the protective cloth control mechanism 3, and is configured to obtain the deployment or retraction state information of each protective cloth 4 to control the electromagnet 10 between adjacent protective cloths 4 in the deployed state to be energized. The protective device further comprises an electromagnetic control mechanism for coordinating and optimizing the closure between the protective cloths 4, which is electrically connected to the electromagnet 10 and the protective cloth control mechanism 3, and is configured to obtain the deployment or retraction state information of each protective cloth 4 to accurately control the energization state of the electromagnet 10 between adjacent protective cloths 4 in the deployed state, and the electromagnetic control mechanism works in coordination with the protective cloth control mechanism 3 to ensure that the deployment of the protective cloth 4 and the energization process of the electromagnet 10 are carried out synchronously. For example: during the deployment process of the protective cloth 4, once the predetermined position is reached, the electromagnetic control mechanism immediately starts the electromagnet 10 to close the edges of the adjacent protective cloths 4, otherwise they are separated, and the electromagnetic control mechanism not only enhances the closure effect between the protective cloths 4, but also significantly improves the overall performance and intelligence level of the tower heat absorber protective device, ensuring that it can operate stably and reliably in a complex and changeable environment.

[0032] In some embodiments, the electromagnet 10 is a flexible electromagnet, which uses flexible and bendable materials; for example: it is wound with soft conductive wire (such as copper wire), bends as the shape changes, and usually contains one or more layers of soft magnetic material (such as ferrite or nanocrystalline alloy), which are magnetized when current passes through the coil to form a magnetic field; it not only has the functions of a traditional electromagnet, such as controlling the magnetic state by current (magnetic when powered on, non-magnetic when powered off), but also has good flexibility and the ability to adapt to complex shapes. The flexible electromagnet occupies less space, allowing the protective cloth 4 to be folded or curled more compactly when retracted.

[0033] In some embodiments, see Figure 1 and Figure 5The protective cloth 4 is a rolling curtain type protective cloth. The protective cloth 4 is designed in the form of a rolling curtain so that the protective cloth 4 can be rolled up compactly when not in use and takes up little space. The protective cloth control mechanism 3 includes a reel 301 and a driving component. The protective cloth 4 is rolled up on the reel 301. The driving component is suitable for driving the reel 301 to rotate relative to the upper header 1-2 to drive the protective cloth 4 to unfold or retract. The rolling curtain type protective cloth is rolled around the reel 301. The reel 301 is installed on the upper header 1-2 as the axis for unfolding and retracting the protective cloth 4. The protective cloth 4 is usually made of high temperature resistant and excellent heat insulation materials such as ceramic fiber cloth and high silica fiber cloth to cope with high temperature environments and provide effective heat insulation protection. The driving component can automatically control the rotation direction and speed of the reel 301 according to the instructions provided by the protective cloth control mechanism to achieve accurate unfolding or retraction of the protective cloth 4.

[0034] In some cases, see Figure 6 The driving component includes a motor 303 and a crown wheel 302 and a driving wheel 304 respectively arranged at both ends of the motor 303, the driving wheel 304 is installed inside the reel tube 301, the crown wheel 302 is installed at one end of the reel tube 301, the driving shaft 8 is connected to the output end of the motor 303, the driving shaft 8 is provided with a driving wheel 304, the outer peripheral wall of the driving wheel 304 abuts against the reel tube 301, one end of the crown wheel 302 is connected to the reel tube 301, and the other end is connected to the upper header 1-2, a tail plug 11 is installed at one end of the reel tube 301 away from the crown wheel 302, the tail plug 11 is provided with a roller needle 9, the roller needle 9 is rotatably connected to the support frame 6, and the support frame 6 is connected to the upper header 1-2 through the fixing frame 7. Regarding the deployment or retraction of the protective cloth 4, it should be noted that the motor 303 drives the driving wheel 304 to make the reel tube 301 rotate forward or reverse to achieve the retraction or deployment of the protective cloth 4.

[0035] In some embodiments, a drooping rod 5 is installed at one end of the protective cloth 4 close to the lower collecting box 1-1 when the protective cloth 4 is unfolded, and the drooping rod 5 is pressed on the lower collecting box 1-1 when the protective cloth 4 is in the unfolded state. The drooping rod 5 serves as the end support of the protective cloth 4 to ensure that the protective cloth 4 can remain flat during the unfolding or retracting process and after the unfolding, and prevent the protective cloth 4 from fluttering or shifting due to wind or other external factors. When the protective cloth 4 is fully unfolded, the drooping rod 5 is pressed on the lower collecting box 1-1, which enhances the contact tightness between the protective cloth 4 and the lower collecting box 1-1, which is beneficial to improving the protection effect.

[0036] In some embodiments, the shading monitoring mechanism includes a photosensitive sensor element. The shading parts of each protective component 2 corresponding to the heat-absorbing pipe fittings 1-3 are provided with photosensitive sensor elements. The shading monitoring mechanism is configured to monitor the photosensitive signals of the shading parts of each protective component 2 corresponding to the heat-absorbing pipe fittings 1-3, so as to be suitable for individually controlling the deployment or retraction of each protective cloth 4 according to the photosensitive signals. The photosensitive sensor elements (such as photodiodes, photoresistors, etc.) can detect changes in solar radiation intensity in real time. They are installed in different shading parts of the heat-absorbing pipe fittings 1-3 to ensure that each protective component 2 can independently sense the lighting conditions in its area. The photosensitive sensor elements can quickly capture lighting changes, so that they can respond in the shortest time and minimize heat loss. Through localized control, the state of each protective component 2 is managed more finely, avoiding waste of resources. Accurate shading monitoring and control strategies reduce unnecessary deployment and retraction times of the protective cloth 4 and reduce the operating frequency of the driving components.

[0037] In some embodiments, the shading monitoring mechanism includes a solar illumination angle analysis module, which is suitable for obtaining the relative position of the sun and the heat absorbing tubes 1-3 to obtain sunlight shading information. The solar illumination angle analysis module uses astronomical algorithms or GPS data combined with local time to accurately calculate the specific azimuth and altitude of the sun relative to the tower heat absorber, and determines the irradiation conditions of the heat absorbing tubes 1-3 by analyzing the geometric relationship between the sun and the heat absorbing tubes 1-3. The module predicts the impending shading event based on the sun's position and geometric model, and sends a signal to the corresponding protective cloth control mechanism 3 in advance to prepare to unfold the protective cloth 4, driving the coil 301 to rotate, so that the protective cloth 4 unfolds and covers the part of the heat absorbing tubes 1-3 that is not expected to be irradiated. The solar illumination angle analysis module can predict shading events in advance, so that the system has enough time to respond and minimize heat loss. The accurate shading prediction and control strategy reduces the unnecessary deployment and retraction times of the protective cloth 4, further optimizes the protection strategy, and improves the adaptability of the system.

[0038] In order to better understand the technical content of the present invention, the following is a description in combination with relatively preferred technical features.

[0039] The present invention provides a protective device for a heat absorber, comprising a plurality of protective components 2 and a shielding monitoring mechanism, wherein the protective components 2 comprise a protective cloth 4 and a protective cloth control mechanism 3, wherein the protective cloth control mechanism 3 is used to unfold or retract the protective cloth 4, wherein the plurality of protective components 2 are arranged in an annular circumferential direction along the outer peripheral side of a heat absorbing pipe 1-3 of the heat absorber 1, wherein the heat absorber 1 further comprises an upper header 1-2 and a lower header 1-1, wherein the heat absorbing pipe 1-3 is arranged between the upper header 1-2 and the lower header 1-1, wherein each protective component 2 is arranged on the upper header 1-2, and the protective cloth control mechanism 3 is used to unfold or retract the protective cloth 4, wherein the plurality of protective components 2 are arranged in an annular circumferential direction along the outer peripheral side of the heat absorbing pipe 1-3 of the heat absorber 1 The cloth 4 is unfolded in the direction close to the lower header 1-1, and flexible electromagnets are arranged relatively at the edges between adjacent protective cloths 4. When the flexible electromagnets are powered on, the adjacent flexible electromagnets attract each other so that the edges of adjacent protective cloths 4 are closed to each other. The electromagnetic control mechanism is electrically connected to the flexible electromagnets and the protective cloth control mechanism 3. The electromagnetic control mechanism is configured to obtain the unfolding or retracting state information of each protective cloth 4 to control the flexible electromagnets between adjacent protective cloths 4 in the unfolded state to be powered on. The protective cloth 4 is a rolling curtain type protective cloth, and the protective cloth control mechanism 3 The protective cloth 4 is wound on the reel 301 and the driving component is suitable for driving the reel 301 to rotate relative to the upper header 1-2 to drive the protective cloth 4 to be unfolded or retracted. The driving component includes a motor 303 and a crown wheel 302 and a driving wheel 304 respectively arranged at both ends of the motor 303. The driving wheel 304 is installed inside the reel 301, and the crown wheel 302 is installed at one end of the reel 301. When the protective cloth 4 is unfolded, a drooping rod 5 is installed at one end close to the lower header 1-1, and when the protective cloth 4 is in the unfolded state, the drooping rod 5 is installed. The rod 5 is pressed onto the lower collecting box 1-1, and the blocking monitoring mechanism includes a photosensitive sensor element. The blocking parts of each protective component 2 corresponding to the heat absorbing pipe fittings 1-3 are provided with photosensitive sensor elements. The blocking monitoring mechanism is configured to monitor the photosensitive signals of the blocking parts of each protective component 2 corresponding to the heat absorbing pipe fittings 1-3, so as to be suitable for individually controlling the deployment or retraction of each protective cloth 4 according to the photosensitive signals. The blocking monitoring mechanism also includes a sunlight angle analysis module, and the sunlight angle analysis module is suitable for obtaining the relative position of the sun and the heat absorbing pipe fittings 1-3 to obtain sunlight blocking information.

[0040] The working process and effect of the protective device are explained. When a sharp drop in light intensity is detected in a certain area, the shading monitoring mechanism immediately transmits this information to the corresponding protective cloth control mechanism 3, and the corresponding motor 303 is started to drive the coil 301 to rotate, so that the protective cloth 4 is quickly unfolded and covers the blocked heat-absorbing pipes 1-3. At the same time, the flexible electromagnets 10 at the edges of adjacent protective cloths 4 are energized and closed to ensure that the protective cloths 4 are in close contact to form a barrier. When the shading monitoring mechanism detects that the light returns to normal, the corresponding protective cloth control mechanism 3 will retract the protective cloth 4 and disconnect the power supply of the flexible electromagnet 10. The motor 303 rotates in the opposite direction to drive the coil 301 to retract the protective cloth 4, effectively isolating the absorbent. The heat pipes 1-3 are connected to the external environment, and the protective cloth 4 is used to reduce heat loss; when the obstruction disappears, the protective cloth 4 is retracted, and in the process of the heat absorbing pipes resuming work, full use is made of direct solar radiation to generate electricity, reducing the time and energy consumption required for preheating the tower heat absorber, improving the stability and economic benefits of the entire system, and enhancing the overall safety and reliability of the system. In addition, in the case of fluctuations in direct solar radiation, it has stronger adaptability, can extend the circulation time of the molten salt of the tower heat absorber working fluid, reduce the number of salt withdrawals, and enhance the continuity of the operation of the heat absorber. In some areas where solar energy resources are abundant and obstruction occurs frequently, the use of this device can improve the thermal efficiency and economy of the solar energy system.

[0041] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0042] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A protective device for a heat absorber, characterized in that: The invention comprises a plurality of protection components (2) and a shielding monitoring mechanism, wherein the protection components (2) comprise a protection cloth (4) and a protection cloth control mechanism (3), wherein the protection cloth control mechanism (3) is used to unfold or retract the protection cloth (4), wherein the plurality of protection components (2) are arranged in a circular circumferential direction along the outer peripheral side of a heat absorbing pipe (1-3) of a heat absorber (1), wherein when the protection cloth (4) of each protection component (2) is in an unfolded state, each protection cloth (3) cooperates to form a protection cover for wrapping the outer peripheral side of the heat absorbing pipe (1-3), wherein the shielding monitoring mechanism is used to monitor sunlight shielding information and / or cloud shielding information of the heat absorbing pipe (1-3), and wherein the shielding monitoring mechanism is electrically connected to each protection cloth control mechanism (3) so as to be suitable for individually controlling the unfolding or retraction of each protection cloth (4) according to the sunlight shielding information and / or the cloud shielding information.

2. The protective device for the heat absorber according to claim 1, characterized in that: The heat absorber (1) further comprises an upper header (1-2) and a lower header (1-1), the heat absorption pipe (1-3) being arranged between the upper header (1-2) and the lower header (1-1), each of the protection components (2) being arranged on the upper header (1-2), and the protection cloth control mechanism (3) being used to unfold the protection cloth (4) in a direction close to the lower header (1-1).

3. The protective device for the heat absorber according to claim 1, characterized in that: Electromagnets (10) are arranged opposite to each other at the edges between adjacent protective cloths (4); when the electromagnets (10) are powered on, the adjacent electromagnets (10) attract each other, so that the edges of the adjacent protective cloths (4) are closed to each other.

4. The protective device for the heat absorber according to claim 3, characterized in that: It also includes an electromagnetic control mechanism, which is electrically connected to the electromagnet (10) and the protective cloth control mechanism (3), and is configured to obtain the deployment or retraction status information of each protective cloth (4) to control the electromagnet (10) between adjacent protective cloths (4) in the deployed state to be energized.

5. The protective device for the heat absorber according to claim 3, characterized in that: The electromagnet (10) is a flexible electromagnet.

6. The protective device for the heat absorber according to claim 2, characterized in that: The protective cloth (4) is a rolling curtain type protective cloth. The protective cloth control mechanism (3) comprises a reel (301) and a driving component. The protective cloth (4) is rolled up on the reel (301). The driving component is suitable for driving the reel (301) to rotate relative to the upper header (1-2) to drive the protective cloth (4) to be unfolded or retracted.

7. The protective device for the heat absorber according to claim 6, characterized in that: The driving component comprises a motor (303) and a crown wheel (302) and a driving wheel (304) respectively arranged at two ends of the motor (303); the driving wheel (304) is installed inside the reel (301); and the crown wheel (302) is installed at one end of the reel (301).

8. The protective device for the heat absorber according to claim 2, characterized in that: When the protective cloth (4) is unfolded, a drooping rod (5) is installed at one end close to the lower header (1-1), and when the protective cloth (4) is in the unfolded state, the drooping rod (5) is pressed onto the lower header (1-1).

9. The protective device for a heat absorber according to any one of claims 1 to 8, characterized in that: The shielding monitoring mechanism comprises a photosensitive sensor element, and the shielding portion of each protective component (2) corresponding to the heat absorbing pipe (1-3) is provided with the photosensitive sensor element. The shielding monitoring mechanism is configured to monitor the photosensitive signal of the shielding portion of each protective component (2) corresponding to the heat absorbing pipe (1-3), so as to be suitable for individually controlling the deployment or retraction of each protective cloth (4) according to the photosensitive signal.

10. The protection device for a heat absorber according to any one of claims 1 to 8, characterized in that: The shading monitoring mechanism comprises a sunlight angle analysis module, and the sunlight angle analysis module is suitable for obtaining the relative position of the sun and the heat absorbing pipe (1-3) to obtain the sunlight shading information.

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