Molten salt groove type solar thermal power generation heat collector

Abstract

The utility model relates to the technical field of photoelectric heating, and discloses a fused salt groove type solar thermal power generation heat collector which comprises a light-transmitting protective cover, a heat collecting pipe, a reflection condenser and a tracking rotating system. The light-transmitting protective cover can allow sunlight to pass through and is provided with a closable cavity; the heat collecting pipe is arranged in the cavity of the light-transmitting protective cover in a suspended mode so that the heat collecting pipe can not rotate along with the sun, and the heat collecting pipe is connected with the molten salt steel pipeline through a flexible hose. The reflective condenser is rotatably arranged in the cavity of the light-transmitting protective cover; the rotary tracking system is connected with the reflective condenser and used for controlling the reflective condenser to rotate along with the angle of the sun so that the reflective condenser can focus on the heat collecting pipe in real time. The solar water heater has the advantages that the heat collecting pipes are arranged in a suspension mode, the heat collecting pipes do not need to rotate along with the sun, the heat collecting pipes are connected with the molten salt steel pipeline through the flexible hoses, rotating joints are not needed, leakage risks do not exist, and maintenance is easy.

Description

Technical Field

[0001] This utility model relates to the field of photoelectric heating technology, specifically a molten salt trough type solar thermal power generation collector. Background Technology

[0002] Concentrated solar thermal power generation focuses solar energy, using a high-temperature medium for heat collection and exchange, and then supplies heat or drives a steam turbine to generate electricity. Because concentrated solar thermal power generation typically incorporates high-temperature medium for heat storage, it can achieve continuous power generation, giving it an advantage that photovoltaic (PV) power generation cannot match. However, with the significant reduction in the cost of PV power generation, while concentrated solar thermal power generation has technological advantages, its cost advantage lags far behind due to the large initial investment required and the limitations of current technology.

[0003] A convenient way to reduce costs in concentrated solar thermal power generation is through large-aperture molten salt trough technology. However, in existing molten salt trough collectors, the collector tubes are mounted on a support frame. During heat collection, the collector tubes rotate synchronously with the support frame as the sun's position changes. This necessitates a flexible connection between the collector tubes and the molten salt steel pipes. Current flexible connections utilize rotary joints, but these joints are prone to leakage and difficult to maintain. Therefore, molten salt trough thermal power generation technology urgently needs a collector structure designed to avoid the oil leakage risks associated with current rotary joints. Utility Model Content

[0004] The purpose of this invention is to provide a molten salt trough type solar thermal power generation collector to solve the problem in the prior art that the ends of the existing collector tubes need to be connected by rotary joints, which are prone to leakage and difficult to maintain.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A molten salt trough type solar thermal power collector includes:

[0007] A light-transmitting protective cover, which allows sunlight to pass through and has a sealable earth cavity;

[0008] The heat collection tube is suspended in the cavity of the light-transmitting protective cover so that the heat collection tube does not rotate with the sun. The heat collection tube is connected to the molten salt steel pipe through a flexible hose.

[0009] A reflective concentrator, which is rotatably disposed within the cavity of a light-transmitting protective cover;

[0010] A tracking and rotation system, connected to the reflective concentrator, controls the concentrator to rotate in accordance with the sun's angle, ensuring that the concentrator focuses on the solar collector tubes in real time. This design allows the solar collector tubes to be suspended, eliminating rotational movement during operation, reducing the need for rotary joints, eliminating leakage risks, and lowering operating and maintenance costs.

[0011] Furthermore, the tracking rotation system includes a tracking control system and a rotation component; the rotation component is disposed in the cavity of the light-transmitting protective cover and located below the heat collection tube, the reflective concentrator is slidably disposed on the rotation component, and the tracking control system is connected to the reflective concentrator and the rotation component respectively to control the rotation component to push the reflective concentrator to rotate following the solar angle so that the reflective concentrator is focused on the heat collection tube in real time.

[0012] Furthermore, the rotating assembly includes a support frame, a guide rail, and a push rod assembly. The guide rail is fixed on the support frame and located below the heat collection tube. The reflector concentrator is slidably mounted on the guide rail via a sliding bearing. The push rod assembly is fixed to the support frame, and the output end of the push rod assembly is connected to the reflector concentrator for pushing the reflector concentrator to slide along the guide rail.

[0013] Furthermore, the pusher assembly includes two pushers, which are located on either side of the central axis of the reflective concentrator. By providing two pushers, the position of the reflective concentrator sliding along the guide rail can be easily adjusted, and the stability of the reflective concentrator can be effectively improved.

[0014] Furthermore, the guide rail is semi-circular, and its center is the midpoint of the axis of the heat collection tube. This arrangement ensures that the reflective concentrator, which slides along the guide rail, focuses on the heat collection tube.

[0015] Furthermore, the tracking control system includes an inclinometer and a computer; the inclinometer is installed on the reflector concentrator, and both the inclinometer and the push rod assembly are connected to the computer signal to provide feedback on the real-time angle of the reflector concentrator to the computer. The computer controls the push rod assembly through a preset algorithm to push the reflector concentrator to rotate following the angle of the sun and to focus on the solar collector tube in real time.

[0016] Furthermore, the reflective concentrator includes a support structure and a reflective layer; the support structure is parabolic in shape, and the reflective layer is distributed on the inner side of the support structure.

[0017] Furthermore, the reflective layer is a reflective mirror or a silver-plated polymer reflective film; the thickness of the reflective layer is 1 mm. This configuration effectively reduces investment costs.

[0018] Furthermore, it also includes flexible steel wires, through which the heat collection tube is suspended within a light-transmitting protective cover. The overall structure of suspending the heat collection tube with flexible steel wires is simple and easy to operate. Moreover, flexible steel wires are high-strength, readily available, and low-cost. After the heat collection tube expands due to heat and undergoes thermal displacement, it easily swings to release energy.

[0019] Furthermore, the light-transmitting protective cover is made of ultra-clear glass. Ultra-clear glass can effectively improve light transmittance.

[0020] This invention has the following advantages over the prior art:

[0021] 1. The molten salt trough solar thermal power generation collector of this utility model has its heat collection tube suspended in the cavity of the light-transmitting protective cover, so that the heat collection tube does not need to rotate with the support frame during the heat collection process. The heat collection tube and the molten salt steel pipe can be connected by a flexible hose, without the need for a rotating joint, eliminating the risk of leakage and making maintenance easy. The light-transmitting protective cover can isolate the external environment from the reflective concentrator without affecting the concentrating heat collection. This utility model not only solves the problems of easy leakage and difficult maintenance of molten salt, but also enables the large-scale utilization of molten salt trough solar thermal power generation.

[0022] 2. The molten salt trough solar thermal power collector of this utility model, due to the installation of a light-transmitting protective cover, effectively isolates the external environment from interference with the reflective concentrator. Therefore, the support structure of the reflective concentrator can adopt a simple and lightweight design, which can maintain the parabolic shape while ensuring that it can support the weight of the reflective layer. At the same time, the reflective layer can also use a 1mm reflector or a silver-plated polymer reflective film, which can effectively reduce the investment cost of the reflective concentrator.

[0023] 3. The molten salt trough solar thermal power generation collector of this utility model suspends the heat collection tube by flexible steel wire. The overall structure is simple and easy to operate. The flexible steel wire has high strength, is easy to obtain, and has low cost. After the heat collection tube expands due to heat and generates thermal displacement, it can easily swing and release energy. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the molten salt trough solar thermal power collector in an embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the reflective concentrator in the molten salt trough solar thermal power collector of this utility model embodiment;

[0026] Figure 3 This is a schematic diagram of the structure of the molten salt trough solar thermal power collector in this embodiment of the present invention, in which the heat collection tube is connected to the molten salt steel pipe through a flexible hose.

[0027] In the diagram: 1. Light-transmitting protective cover; 101. Chamber; 2. Heat collection tube; 3. Flexible hose; 4. Reflective concentrator; 401. Support structure; 402. Reflective layer; 5. Support frame; 6. Guide rail; 7. Push rod; 8. Sliding bearing; 9. Inclinometer; 10. Flexible steel wire; 11. Beam; 12. Molten salt steel pipe. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be further discussed and described in the description of the subsequent figures.

[0032] Example:

[0033] like Figures 1 to 3 As shown, this utility model provides a molten salt trough type solar thermal power generation collector, including: a light-transmitting protective cover 1, a heat collection tube 2, a reflective concentrator 4, and a tracking and rotating system; the light-transmitting protective cover 1 allows sunlight to pass through and has a sealable cavity 101, the heat collection tube 2 is suspended in the cavity 101 of the light-transmitting protective cover 1 so that the heat collection tube 2 does not rotate with the sun, the heat collection tube 2 is connected to a molten salt steel pipe 12 through a flexible hose 3; the reflective concentrator 4 is rotatably installed in the cavity 101 of the light-transmitting protective cover 1; the rotation and tracking system is connected to the reflective concentrator 4 and is used to control the reflective concentrator 4 to rotate with the sun's angle so that the sunlight beam 11 emitted by the reflective concentrator 4 is focused on the heat collection tube 2 in real time.

[0034] In this embodiment, a light-transmitting protective cover 1 is provided to avoid the efficiency loss caused by the easy deformation of the support frame under wind load in the prior art. Specifically, the light-transmitting protective cover 1 can be a greenhouse structure made of ultra-clear glass, which has high light transmittance. This protects the light-concentrating and heat-collecting components inside the light-transmitting protective cover 1 from external environmental interference without affecting the light-concentrating and heat-collecting. The light-transmitting protective cover 1 can achieve standardized and modular construction, effectively reducing costs. Its top and sides are flat and regular, facilitating cleaning and maintenance, and ensuring light transmittance.

[0035] The collector tube 2 is suspended inside the light-transmitting protective cover 1 by a flexible steel wire 10. The end of the collector tube 2 is connected to the molten salt steel pipe 12 through a flexible hose 3. During operation, the collector tube 2 only experiences thermal displacement due to thermal expansion, which is released through the flexible steel wire 10, the corrugated pipe of the collector tube, and the flexible hose 3. The collector tube 2 does not rotate, does not require a rotary joint, has almost no risk of leakage, and has low operation and maintenance costs. Moreover, the suspended installation of the collector tube 2 helps to reduce the cosine effect and can make full use of the length of the collector tube for heat collection.

[0036] In this embodiment, the tracking rotation system includes a tracking control system and a rotation component; the rotation component is disposed in the chamber 101 of the light-transmitting protective cover 1 and located below the heat collection tube 2; the reflective concentrator 4 is slidably disposed on the rotation component; the tracking control system is connected to the reflective concentrator 4 and the rotation component respectively, so as to control the rotation component to push the reflective concentrator 4 to rotate following the solar angle, so that the solar beam 11 reflected by the reflective concentrator is focused on the heat collection tube 2 in real time.

[0037] like Figure 1 As shown, the rotating assembly includes a support frame 5, a guide rail 6, and a push rod assembly. All rotating components are located within the chamber 101 of the light-transmitting protective cover 1. The guide rail 6 is fixed to the support frame 5 and located below the heat collection tube 2. Specifically, the guide rail 6 is semi-circular, and its center is the midpoint of the axis of the heat collection tube 2 to ensure the reflector concentrator can focus on the heat collection tube. The reflector concentrator 4 is slidably mounted on the guide rail 6 via a sliding bearing 8. The push rod assembly is fixed to the support frame 5, and its output end is connected to the reflector concentrator 4. The tracking control system pushes the reflector concentrator 4 along the guide rail via the push rod assembly to track the solar angle in real time. The push rod assembly includes two push rods 7, located on either side of the central axis of the reflector concentrator 4. By using two push rods 7, the sliding distance of the reflector concentrator 4 along the guide rail 6 can be precisely adjusted, improving the stability of the reflector concentrator 4.

[0038] The tracking and control system includes an inclinometer 9 and a computer; the computer has a preset astronomical algorithm (the astronomical algorithm is commonly used in this field); the inclinometer 9 is installed on the reflector concentrator 4 and connected to the computer signal, and provides real-time feedback to the computer on the angle of the reflector concentrator 4 to ensure tracking accuracy; both push rods 7 are connected to the computer signal, and the computer calculates the data provided by the inclinometer 9 through the preset astronomical algorithm, and then sends signals to the two push rods 7 to push the reflector concentrator 4 to rotate following the angle of the sun, so as to ensure that the solar beam 11 emitted by the reflector concentrator 4 is focused on the heat collection tube 2 in real time.

[0039] like Figure 2 As shown, the reflective concentrator 4 includes a support structure 401 and a reflective layer 402. The support structure 401 is parabolic in shape, and the reflective layer 402 is distributed on the inner surface of the support structure 401. The reflective layer 402 is a reflective mirror or a silver-plated polymer reflective film. Because the reflective concentrator 4 is located inside the light-transmitting protective cover 1, the light-transmitting protective cover 1 can isolate the external environment from interference with the concentrating and heat-collecting structure, allowing the support structure 401 to be simple and lightweight, ensuring that it maintains its parabolic shape after receiving the reflective layer. Moreover, the thickness of the reflective layer 402 can be adjusted to 1mm, effectively reducing investment costs. Specifically, the support structure 401 can be made of recycled plastic, which is inexpensive and achieves resource reuse.

[0040] In practice:

[0041] The light-transmitting protective cover 1 is an ultra-clear glass greenhouse structure, which can be produced in a standardized and modular manner. It has high light transmittance, and the enclosed environment of the greenhouse structure protects the solar concentrator from external environmental interference. The top and sides are particularly flat and regular, making cleaning and maintenance simple and cost-effective. The solar collector tube 2 is suspended from the top of the greenhouse structure by flexible steel wire 10. During operation, the solar collector tube 2 only experiences thermal displacement due to thermal expansion and does not rotate, eliminating the need for rotary joints. An inclinometer 9 is installed on the reflector concentrator 4 to track its angle in real time. A computer controls a push rod to move the reflector concentrator 4 along the guide rail 6, allowing it to rotate to follow the sun's angle and focus the reflected sunlight beam 11 onto the solar collector tube 2 in real time.

[0042] This invention has many advantages in production, installation, commissioning, operation and maintenance. It can avoid the leakage risk of rotary joints in molten salt trough thermal power generation technology, realize the commercial use of molten salt troughs, and be more competitive in the new energy field of solar thermal power generation.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molten salt trough type solar thermal power collector, characterized in that, include: A light-transmitting protective cover, which allows sunlight to pass through and has a sealable earth cavity; The heat collection tube is suspended in the cavity of the light-transmitting protective cover so that the heat collection tube does not rotate with the sun. The heat collection tube is connected to the molten salt steel pipe through a flexible hose. A reflective concentrator, which is rotatably disposed within the cavity of a light-transmitting protective cover; A tracking rotation system, which is connected to a reflective concentrator, is used to control the reflective concentrator to rotate in accordance with the angle of the sun, so that the reflective concentrator can focus on the heat collection tube in real time.

2. The molten salt trough solar thermal power collector according to claim 1, characterized in that: The tracking and rotation system includes a tracking and control system and a rotation component. The rotation component is disposed in the cavity of the light-transmitting protective cover and located below the heat collection tube. The reflective concentrator is slidably disposed on the rotation component. The tracking and control system is connected to the reflective concentrator and the rotation component respectively to control the rotation component to push the reflective concentrator to rotate following the angle of the sun, so that the reflective concentrator focuses on the heat collection tube in real time.

3. The molten salt trough solar thermal power collector according to claim 2, characterized in that: The rotating assembly includes a support frame, a guide rail, and a push rod assembly. The guide rail is fixed on the support frame and located below the heat collection tube. The reflector concentrator is slidably mounted on the guide rail via a sliding bearing. The push rod assembly is fixed to the support frame, and the output end of the push rod assembly is connected to the reflector concentrator to push the reflector concentrator to slide along the guide rail.

4. The molten salt trough solar thermal power collector according to claim 3, characterized in that: The push rod assembly includes two push rods, which are located on opposite sides of the central axis of the reflector concentrator.

5. The molten salt trough solar thermal power collector according to claim 3, characterized in that: The guide rail is semi-circular, and the center of the guide rail is the midpoint of the axis of the heat collection tube.

6. The molten salt trough solar thermal power collector according to claim 3, characterized in that: The tracking and control system includes an inclinometer and a computer. The inclinometer is installed on the reflector concentrator. Both the inclinometer and the push rod assembly are connected to the computer to provide feedback on the real-time angle of the reflector concentrator. The computer controls the push rod assembly to drive the reflector concentrator to rotate following the angle of the sun and to focus on the solar collector tube in real time through a preset algorithm.

7. The molten salt trough solar thermal power collector according to claim 1, characterized in that: The reflective concentrator includes a support structure and a reflective layer; the support structure is parabolic in shape, and the reflective layer is distributed on the inner side of the support structure.

8. The molten salt trough solar thermal power collector according to claim 7, characterized in that: The reflective layer is a reflective mirror or a silver-plated polymer reflective film; the thickness of the reflective layer is 1 mm.

9. The molten salt trough solar thermal power collector according to claim 1, characterized in that: It also includes flexible steel wires, through which the heat collection tube is suspended inside a light-transmitting protective cover.

10. The molten salt trough solar thermal power collector according to claim 9, characterized in that: The light-transmitting protective cover is made of ultra-clear glass.

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