Linear Fresnel concentrating solar photo-thermal assisted water photolysis hydrogen production system

Abstract

The utility model discloses a linear Fresnel concentrating solar photo-thermal assisted water photolysis hydrogen production system, and belongs to the field of solar energy utilization and renewable energy source large-scale preparation. Comprising a water storage tank, a condensation assembly, a photocatalytic reactor and a gas-liquid-catalyst separation assembly. The water storage tank is used for storing a catalyst and a sacrificial agent and forms a loop with the photocatalytic reactor through the water pump. The condensation assembly comprises a linear Fresnel lens and a north-south tracking system part. The problems that a traditional CPC is insufficient in condensation multiple, a tower type butterfly tracking system is complex, and the condensation multiple is too high, so that a photocatalyst is denatured are solved. By introducing a linear Fresnel condensation technology, a proper solar condensation multiple is obtained and is used for photo-thermal assisted water photolysis hydrogen production. According to the invention, appropriate light-condensing photo-thermal auxiliary catalysis conditions can be provided, the area of the catalytic reactor and the catalyst amount can be reduced, the catalyst agglomeration can be prevented, and the hydrogen production efficiency of the system can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of solar energy utilization and large-scale preparation of renewable energy, and relates to a photocatalytic water decomposition hydrogen production and hydrogen collection system under direct solar illumination, and in particular to a linear Fresnel concentrated solar thermal assisted photocatalytic water decomposition hydrogen production system. Background Art

[0002] With the continuous consumption of non-renewable energy such as coal, oil, and natural gas, the energy crisis and environmental problems are becoming increasingly severe, and the development of renewable energy is imminent. Hydrogen, as a clean energy with high energy density, convenient storage, and no combustion pollutants, is increasingly valued by countries around the world. Solar energy reserves are amazing, and it is the most abundant energy source and the cleanest energy source. However, the dispersion and instability of solar energy make it difficult to use it on a large scale. Solar photocatalytic water splitting to produce hydrogen is a technology that uses solar energy to directly synthesize hydrogen. In the process of producing hydrogen, there is no carbon emission and no pollution. The design, research and development, and innovation of solar photocatalytic water splitting equipment are of great significance to the large-scale application of photocatalytic water splitting to produce hydrogen. At present, the research on solar photocatalytic water splitting equipment has two focuses: cheap and reliable solar energy concentration technology and high-efficiency photocatalytic reactors.

[0003] Generally speaking, the performance of hydrogen production by photolysis of water increases with the increase of light intensity. Solar concentrators can significantly increase the light intensity and system temperature, thereby improving the hydrogen production efficiency of the photoreactor. However, if the concentration multiple reaches tens to hundreds of times, the temperature of the catalytic reactor will be too high, causing the catalyst to fail. Therefore, the concentration multiple used should be about 10 times. Common concentrators include tower concentrators, trough concentrators, butterfly concentrators, and parabolic concentrators. Although the parabolic concentrator has a simple structure, the concentration multiple is not ideal. The tower concentrator and butterfly concentrator have too large a light multiple, and are also not suitable for photolysis of water hydrogen production systems. The linear Fresnel concentrator can adjust the concentration multiple by adjusting the distance, and the light spot is relatively uniform, so it is suitable for photolysis of water hydrogen production systems.

[0004] The photocatalytic hydrogen production reactor mainly adopts the traditional tubular photocatalytic reactor and the flat-plate photocatalytic reactor. The actual light receiving area of ​​the tubular photocatalytic reactor is small, and the catalyst is easy to accumulate in the tube, causing blockage. The actual light receiving area of ​​the flat-plate photocatalytic reactor is large, so the system usually has a higher solar energy utilization efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a linear Fresnel concentrated solar thermal assisted photocatalytic water splitting hydrogen production system. Focusing sunlight onto a flat photocatalytic reactor is beneficial to reducing the size of the photocatalytic reactor and the amount of catalyst used; at the same time, focusing light is beneficial to increasing the temperature of the photocatalytic reactor, providing photothermal assisted catalysis for the system, and is beneficial to improving the hydrogen production efficiency of the system; the catalyst of the present invention circulates with the system, and the disturbance of the magnetic stirrer reduces the agglomeration of the catalyst.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A linear Fresnel concentrated solar thermal assisted photocatalytic water splitting hydrogen production system, comprising a water storage tank, a concentrating component, a photocatalytic reactor, and a gas-liquid-catalyst separation component;

[0008] The water storage tank stores the reaction liquid and the catalyst; the bracket supports the linear Fresnel lens;

[0009] The focusing assembly includes a linear Fresnel lens, a bracket, a base, a reducer, a stepper motor, a stepper motor controller, a bearing seat and a support column; the base supports the reducer; the reducer, the bearing seat and the support column are tightly connected together; the bracket is welded on the support column; the reducer and the stepper motor are connected together through a keyway; the focusing assembly is formed into a whole by welding;

[0010] The photocatalytic reactor is located a certain distance below the linear Fresnel lens and is mounted on a bracket;

[0011] The gas-liquid-catalyst separation component includes a photocatalytic reactor, an edge water outlet, a water inlet, a pipeline and a water storage tank, a water pump, a hydrogen storage tank, a water tank, a magnetic stirrer and a magnet; the hydrogen storage tank is placed in a water tank filled with a certain amount of water, and forms a closed loop with the water storage tank through the pipeline; the water storage tank is placed above the magnetic stirrer and contains a magnet for stirring.

[0012] As a further improvement of the present invention, the water storage tank is a cylindrical stirring barrel, which is used to prepare the reaction liquid. The cylindrical stirring barrel has a feeding hole on the top and a water outlet on the bottom, and is connected to a water pump through a pipeline.

[0013] As a further improvement of the present invention, the focusing surface is a high-transmittance linear Fresnel lens, which provides a uniform linear focusing, and the light spot thereof is almost the same in shape and size as the photocatalytic reactor.

[0014] As a further improvement of the present invention, the focusing assembly and each supporting component are connected by welding and keyways to form a linked whole. The size of the stepper motor is reduced by a reducer to save costs. The stepper motor controller sends a certain number of pulses every day according to control needs to control the stepper motor to rotate a certain angle, thereby realizing north-south tracking of the focusing assembly.

[0015] As a further improvement of the present invention, the outer layer of the water storage tank is covered with a thermal insulation layer, which reduces heat loss while storing the reaction liquid and the catalyst, so as to provide better photothermal assisted catalysis.

[0016] As a further improvement of the present invention, the magnetic stirrer needs to be turned on during the operation of the system to control the rotation of the magnetic particles and reduce the agglomeration of the catalyst.

[0017] The present invention has the following advantages:

[0018] Compared with the dual-axis tracking and focusing system, the present invention is a single-axis tracking system, which simplifies the tracking system.

[0019] Furthermore, the present invention introduces linear focusing technology to focus sunlight onto a flat-plate photocatalytic reactor, thereby providing a suitable focusing multiple, reducing the size of the photocatalytic reactor, and reducing the amount of catalyst used.

[0020] Furthermore, the present invention increases the reaction temperature of the catalytic reactor by concentrating light, provides photothermal assisted catalysis, and improves the hydrogen production efficiency of the system;

[0021] Furthermore, the catalyst of the present invention circulates with the system and is disturbed by the magnetic stirrer, thereby reducing the agglomeration of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an overall schematic diagram of the linear Fresnel concentrating solar thermal assisted photolysis water hydrogen production system of the present invention;

[0023] Figure 2 It is a schematic diagram of the linear Fresnel focusing principle of the present invention;

[0024] Figure 1 In the figure, 1. linear Fresnel lens, 2. bracket, 3. base, 4. reducer, 5. stepper motor, 6. stepper motor controller, 7. bearing seat, 8. support column, 9. photocatalytic reactor, 10. hydrogen storage tank, 11. water tank, 12. water pump, 13. water storage tank, 14. magnetic stirrer, 15. magnet, 16. focusing component, 17. water outlet, 18. water inlet, 19. feeding hole, 20. gas-liquid-catalyst separation component.

[0025] Figure 2In the figure, 1. Linear Fresnel lens, 2. Light spot, 3. Focal length, 4. Center line. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the present invention includes a water storage tank 13 , a focusing component 16 , a photocatalytic reactor 9 , and a gas-liquid-catalyst separation component 20 .

[0028] The linear Fresnel lens 1 provides a uniform linear focusing, and adjusts the light spot to be the same shape and size as the photocatalytic reactor. By focusing the light, the area of ​​the photocatalytic reactor 9 is reduced, and the amount of catalyst used is reduced.

[0029] The linear Fresnel concentrator is coupled with a flat-plate photocatalytic reactor to realize the production of hydrogen from water by solar light splitting. The catalyst remains suspended in the flowing system, allowing the catalyst to receive sunlight from multiple angles, thus improving the solar energy utilization rate of the system.

[0030] The linear Fresnel lens 1 , the bracket 2 , the reducer 4 , the stepping motor 5 , the bearing seat 7 and the support column 8 are tightly connected into a linked whole by welding, bonding and the like, forming a focusing assembly 16 .

[0031] The stepper motor controller 6 sends a certain number of pulse signals every day according to the tracking control needs, controls the stepper motor 5 to rotate a certain angle, and then drives the focusing assembly 16 to rotate, ensuring that the sunlight directly shines on the focusing assembly 16.

[0032] The photocatalytic reactor 9 is mounted on the bracket 2 and is located a certain distance below the linear Fresnel lens 1, providing a reaction site for photocatalytic hydrogen production; by adjusting the focal length, about 10 times the actual solar energy concentration is obtained; the linear Fresnel lens 1 focuses the light onto the photocatalytic reactor 9, thereby generating hydrogen.

[0033] When the sunshine starts, the water pump 12 is turned on, and the reaction liquid and the catalyst start from the water tank 13 and enter the photocatalytic reactor 9 through the water pump 12. The hydrogen produced by the photocatalytic reactor is carried out by the circulating liquid and enters the water tank 13. The water carried by the air pipe settles under the action of gravity, and the hydrogen is separated from the reaction liquid under the action of the magnetic stirrer 14 and the magnet 15, and enters the hydrogen storage tank 10 from the top of the water tank 13 through the water tank 11.

[0034] The water storage tank 13 is a cylindrical stirring barrel, and sacrificial agent and catalyst are added to the system through the top feeding hole 19; the outer layer of the water storage tank 13 is wrapped with a thermal insulation layer to reduce heat loss and provide better photothermal assisted catalysis.

[0035] The magnetic stirrer 14 needs to be turned on during the operation of the system to control the rotation of the magnet 15, reduce the agglomeration of the catalyst, and accelerate the separation of hydrogen and liquid.

[0036] Although the disclosure information of the present invention is disclosed as above, the scope of protection disclosed in the present invention is not limited thereto. Persons skilled in the art in the field of the present invention may make slight changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications should be deemed to be within the scope of protection determined by the claims of the present invention.

Claims

1. A linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system. It is characterized in that It comprises a water storage tank (13), a light focusing component (16), a photocatalytic reactor (9), and a gas-liquid-catalyst separation component (20); The water storage tank (13) stores the reaction liquid and the catalyst; the bracket (2) supports the linear Fresnel lens (1); The focusing assembly (16) comprises a linear Fresnel lens (1), a bracket (2), a base (3), a reducer (4), a stepper motor (5), a stepper motor controller (6), a bearing seat (7) and a support column (8); the base (3) supports the reducer (4); the reducer (4), the bearing seat (7) and the support column (8) are tightly connected together; the bracket (2) is welded to the support column; the reducer (4) and the stepper motor (5) are connected together through a keyway; the stepper motor controller (6) is installed at a position 4 cm below the stepper motor (5); the focusing assembly (16) is formed into a whole by welding; the photocatalytic reactor (9) is located at a certain distance below the linear Fresnel lens (1), and the linear Fresnel lens (1) focuses light onto the photocatalytic reactor (9); the photocatalytic reactor (9) is installed on the bracket (2).

2. According to the linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system of claim 1, It is characterized in that The gas-liquid-catalyst separation component (20) is composed of a photocatalytic reactor (9), an edge water outlet (17), a water inlet (18), a pipeline and a water storage tank (13), a water pump (12), a hydrogen storage tank (10), a water tank (11), a magnetic stirrer (14) and a magnet (15); the hydrogen storage tank (10) is placed in a water tank (11) filled with a certain amount of water, and forms a closed loop with the water storage tank (13) through the pipeline; the water storage tank (13) is placed above the magnetic stirrer (14) and contains a magnet (15) for stirring.

3. According to the linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system of claim 1, It is characterized in that The water storage tank (13) is a cylindrical stirring barrel, which is used to prepare the reaction liquid. The cylindrical stirring barrel has a feeding hole (19) on the top and a water outlet hole on the bottom, and is connected to the water pump (12) through a pipeline.

4. According to claim 1, a linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system, It is characterized in that The focusing assembly (16) and the supporting components are connected by welding and keyways to form a linked whole; the size of the stepper motor (5) is reduced by a reducer (4) to save costs; the stepper motor controller (6) sends a certain number of pulses every day according to control needs to control the stepper motor (5) to rotate a certain angle, thereby achieving north-south tracking of the focusing assembly (16).

5. According to claim 2, a linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system, It is characterized in that The magnetic stirrer (14) needs to be turned on during the operation of the system to control the rotation of the magnetic element (15) and reduce the agglomeration of the catalyst.

6. According to claim 3, a linear Fresnel concentrated solar thermal assisted water splitting hydrogen production system, It is characterized in that The outer layer of the water storage tank (13) is covered with a heat-insulating layer, which reduces heat loss while storing the reaction liquid and the catalyst, thereby providing better photothermal-assisted catalysis.

Images