A dual-vortex photocatalytic device

Abstract

The application provides a double-vortex photocatalytic device, which comprises a Taylor-Couette double-vortex photocatalytic reactor, material inlet and outlet pipelines and a cooling system; the Taylor-Couette double-vortex photocatalytic reactor comprises a fixed cylinder, a rotating cylinder, a rotating shaft, a variable speed motor and a light source; the rotating cylinder is inserted into the fixed cylinder, and the central axes of the fixed cylinder and the rotating cylinder coincide to form two annular cavities for accommodating photocatalysts and reactants; the cooling system surrounds the light source to cut off high temperature emitted by the light source, facilitate control of the temperature of the internal sewage, prevent the temperature of the light source from being too high to deactivate the photocatalytic material and reduce the degradation efficiency of the photocatalytic reaction; the double-vortex structure increases the material processing capacity of the Taylor-Couette reactor, enables the photocatalytic material to be better dispersed in the reactor, uniformly receives photons and fully performs photocatalytic reaction with the sewage.

Description

Technical Field

[0001] This invention relates to the field of photocatalytic reaction equipment design, specifically a dual-vortex photocatalytic device. Background Technology

[0002] With the rapid advancement of technology and living standards, human-caused environmental pollution is becoming increasingly severe, with water pollution being one of the problems. To protect the aquatic environment, numerous methods have been developed, and photocatalysis technology has attracted attention due to its ease of operation and the availability and inexpensive materials. However, photocatalysis technology is hampered by the lack of suitable photocatalytic devices to fully realize its potential; therefore, the development of novel photocatalytic devices is of great significance.

[0003] The Taylor-Couette reactor, compared to traditional photocatalytic reactors, can improve mass transfer efficiency and photon transmission efficiency, showing great promise in the field of photocatalysis. The Taylor-Couette reactor is based on Taylor-Couette vortex construction. Its working principle involves the solution in the gap between two rotating cylinders being forced by the rotation of the walls to form a toroidal Couette flow and a secondary steady-state flow characterized by axisymmetric toroidal vortices. Reactors based on Taylor-Couette vortices can promote mixing and contact between reactants, increase the reaction surface area and reaction time, and significantly reduce damage to photocatalytic materials due to low wall shear forces. Simultaneously, the dispersing effect of the vortex helps the photocatalytic material to better and more uniformly receive photons, completing the photocatalytic reaction. However, existing Taylor-Couette reactors suffer from risks such as uncontrollable experimental temperature, low material throughput, and solution leakage damaging the motor, preventing their scaling up and hindering industrial-scale production. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a dual-vortex photocatalytic device, which increases the material processing capacity of the Taylor-Couette reactor, facilitates the control of the internal wastewater temperature, and provides technical support for its industrialization in the field of photocatalysis.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A dual-vortex photocatalytic device, characterized in that it includes a Taylor-Couette dual-vortex photocatalytic reactor, material inlet and outlet pipelines, and a cooling system;

[0007] The Taylor-Couette dual-vortex photocatalytic reactor includes a fixed cylinder, a rotating cylinder, a rotating shaft, a variable-speed motor, and a light source. The fixed cylinder is an annular cylinder with an upward-facing opening, surrounded by inner and outer sidewalls. Its annular cavity is used to place the photocatalytic material and the rotating cylinder. The rotating cylinder has a downward-facing opening, and its inner diameter is between the diameters of the inner and outer sidewalls of the fixed cylinder. The wall of the rotating cylinder is inserted into the annular cavity of the fixed cylinder, dividing the annular cavity into two interconnected annular cavities at the bottom. The rotating shaft is fixedly connected to the top of the rotating cylinder, and the rotating shaft is driven by the variable-speed motor. The light source is located within the space enclosed by the inner wall of the fixed cylinder.

[0008] The cooling system is arranged around the light source, and the upper and lower parts of the outer wall of the fixed cylinder are respectively provided with material inlet and material outlet connected to material inlet and outlet pipelines;

[0009] The fixed cylinder, rotating cylinder, and cooling system surrounding the light source are all made of transparent material.

[0010] Furthermore, the central axes of the fixed cylinder and the rotating cylinder coincide.

[0011] Furthermore, the cooling system is an annular cylindrical cooling cavity disposed between the inner wall of the fixed cylinder and the light source, and cooling water inlet and outlet pipes are respectively disposed in the lower and upper parts of the cylindrical cooling cavity.

[0012] Furthermore, the annular cylindrical cooling cavity and the fixed cylinder are integrated, and both share the inner wall of the fixed cylinder.

[0013] Furthermore, the material inlet is not higher than the inner wall of the fixed cylinder and is connected to the sewage tank; the material outlet is located on the side opposite to the material inlet and is connected to the water purification tank.

[0014] Furthermore, the light source is a xenon lamp, and the central axis of the xenon lamp and the fixed cylinder coincide; the xenon lamp is connected to an adjustable power supply.

[0015] Furthermore, the Taylor-Kueit dual-vortex photocatalytic reactor is placed inside a cylindrical support with a cover.

[0016] Furthermore, a feed pump and a feed valve are provided between the material inlet and the sewage tank, a discharge valve is provided between the material outlet and the clean water tank, a water inlet valve is provided at the inlet of the cooling system, and a water outlet valve is provided at the outlet of the cooling water.

[0017] Furthermore, the rotating shaft is a detachable shaft, and the length of the rotating drum extending into the fixed drum can be adjusted by replacing the rotating shaft with one of different lengths.

[0018] Furthermore, a filter screen is added at the material outlet.

[0019] The beneficial effects of this invention are:

[0020] The Taylor-Couette dual-vortex design proposed in this invention, consisting of a fixed cylinder and a rotating cylinder, facilitates the uniform dispersion of photocatalytic materials within the photocatalytic reactor. This allows for better reception of photons and photocatalytic reactions with pollutants. Simultaneously, the dual-vortex configuration increases the material throughput per pass, providing feasibility for large-scale application of the device. Furthermore, the device allows for selection of the photocatalytic reactor's processing mode based on different requirements: a continuous reactor for rapid water purification and a batch reactor for thorough wastewater treatment. The added cooling system prevents excessively high lamp temperatures from deactivating the photocatalytic materials and reducing the degradation efficiency of the photocatalytic reaction. This invention provides a new approach to photocatalytic devices, contributing to the further industrial-scale development of photocatalytic technology. Attached Figure Description

[0021] Figure 1 Flowchart of the Taylor-Kueit dual-vortex photocatalytic system;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Dual vortex photocatalytic converter; 2-Cooling water inlet; 3-Sewage tank; 4-Feed pump; 5-Clean water tank; 6-Material inlet valve; 7-Cooling water outlet valve; 8-Cooling water inlet valve; 9-Material outlet valve; 11-Stabilized cylinder; 12-Rotating cylinder; 13-Annular cylindrical cooling chamber; 14-Rotating shaft; 15-Variable speed motor; 16-Xenon lamp; 17-Adjustable power supply; 18-Cover plate; 19-Support; 110-Material outlet; 111-Cooling water inlet; 112-Cooling water outlet; 113-Material inlet. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and examples. It should be noted that the described embodiments are merely some, and not all, of the embodiments of the present invention.

[0025] Reference Figure 1The present invention provides a dual-vortex photocatalytic device, comprising a Taylor-Couette dual-vortex photocatalytic reactor 1, material inlet and outlet pipelines, and a cooling system. The Taylor-Couette dual-vortex photocatalytic reactor 1 includes a fixed cylinder 11, a rotating cylinder 12, a rotating shaft 14, a variable-speed motor 15, and a light source. The fixed cylinder 11 is an annular cylinder with inner and outer sidewalls and an upward-facing opening. Its annular cavity is used to place photocatalytic materials and the rotating cylinder 12. The rotating cylinder 12 has a downward-facing opening, and its inner diameter is between the inner and outer wall diameters of the fixed cylinder 11. The cylinder wall of the rotating cylinder 12 is inserted into the annular cavity of the fixed cylinder. The central axes of the fixed cylinder 11 and the rotating cylinder 12 coincide, dividing the annular cavity into two interconnected annular cavities for material reaction. The top of the rotating drum 12 is fixedly connected to a rotating shaft 14, which is driven by a variable speed motor 15. The light source is located within the space enclosed by the inner wall of the fixed drum 11. The cooling system is arranged around the light source to isolate the high temperature emitted by the light source. The upper and lower parts of the outer wall of the fixed drum 11 are respectively provided with a material inlet 113 and a material outlet 20, which are connected to the material inlet and outlet pipelines. The material inlet 113 is not higher than the height of the inner wall of the fixed drum 11 and is connected to the sewage tank 3. The material outlet 110 is located on the side opposite to the material inlet 113 and is connected to the clean water tank 5.

[0026] A feed pump 4 and a feed valve 6 are provided between the material inlet 113 and the sewage tank 3. Sewage flows into the feed pump 4 by gravity from the lower end of the sewage tank 3, and the sewage is pumped into the photocatalytic reactor 1 by the feed pump 4. A discharge valve 9 is provided between the material outlet 110 and the clean water tank 5. A water inlet valve 8 is provided at the cooling system inlet 111, and a water outlet valve 7 is provided at the cooling water outlet 112. A filter screen is added to the material outlet 110 to prevent photocatalytic particles from flowing into the clean water tank 5 along with the material.

[0027] The fixed cylinder 11, rotating cylinder 12, and cooling system surrounding the light source are all made of transparent material. The light source of the Taylor-Couette dual-vortex photocatalytic reactor is a xenon lamp 16, which is connected to an adjustable power supply 17, and the central axis of the xenon lamp 16 coincides with that of the fixed cylinder 11.

[0028] The cooling system is an annular cylindrical cooling cavity 13 disposed between the inner wall of the fixed cylinder 11 and the light source. The lower and upper parts of the cylindrical cooling cavity 13 are respectively provided with a cooling water inlet 111 and a cooling water outlet 112, which are connected to cooling water inlet and outlet pipes. Figure 1 In one embodiment, the annular cylindrical cooling cavity and the fixed cylinder 11 are integral, sharing the inner wall of the fixed cylinder 11. The inner wall of the fixed cylinder 11 has a radius of 203 mm and a wall thickness of 3 mm, while the outer wall has a radius of 231 mm and a wall thickness of 3 mm.

[0029] Preferably, the Taylor-Couette dual-vortex photocatalytic reactor 1 is placed inside a cylindrical support 19 with a cover plate 18 to prevent external natural light from interfering with the photocatalytic reaction.

[0030] Furthermore, the rotating shaft 14 can be replaced with a shaft of different length, and the length of the rotating drum 12 extending into the fixed drum 11 can be adjusted by replacing the rotating shaft 14.

[0031] The control valves include a material inlet valve 6, a material outlet valve 9, a cooling water inlet valve 8, and a cooling water outlet valve 7. Adjusting these control valves controls the flow rate and alters the reactor's wastewater treatment method. By adjusting the feed and discharge flow rates of the material inlet valve 6 and the material outlet valve 9 to a range of 1-20 g / ml, the reactor is converted into a continuous reactor.

[0032] If the water in the clean water tank 5 after the previous treatment still needs to be treated again, it should be poured into the sewage tank 3 for secondary treatment after the materials in the sewage tank 3 have been treated. Example

[0033] A 10 mg / L Rhodamine B solution was prepared and placed in the wastewater tank 3 as a wastewater sample to be treated. 3-8 ωt% CQDs / BiOCl was synthesized as a photocatalytic material and added to the fixed cylinder 11 as suspended particles or fixed on the rotating cylinder 12 to carry out photocatalytic reaction.

[0034] The material outlet valve 9 is closed, and all Rhodamine B is injected into the fixed cylinder 11 through the feed pump 4. Then the material inlet valve 6 is closed, so that the Taylor-Couette dual vortex photocatalytic device 1 becomes an intermittent reactor.

[0035] The rotational speed of the rotating drum 12 is set to a range of 0-400 rpm by adjusting the variable speed motor 15. The distance extended into the fixed drum 11 is changed to 0-5 cm by changing the rotating shaft 14. The variable speed motor 15 is mounted on the cover plate 18 to support the rotating drum 12.

[0036] The power of the xenon lamp 16 is set to a range of 300-320 W by adjusting the adjustable power supply 17. The ambient temperature is maintained and controlled at 25-50 ℃ by adjusting the cooling water inlet valve 8 and the cooling water outlet valve 7.

[0037] Every 10 minutes, the material outlet valve 9 is opened, and samples are taken in the water purification tank 5 to analyze the photocatalytic degradation efficiency until photocatalytic equilibrium is reached.

[0038] Open the material outlet valve 9 to discharge the treated water in the fixed cylinder 11 into the clean water tank 5. Remove the rotating cylinder 12, the rotating shaft 14, the variable speed motor 15 and the cover plate 18 and clean and recycle the remaining photocatalytic material inside the fixed cylinder 11.

[0039] The dual-vortex photocatalytic device described in this invention can be used not only as a photocatalytic device, but also in fields such as wastewater treatment by adsorption, particle synthesis, and cell culture.

[0040] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A dual vortex photocatalytic device, characterized by, This includes the Taylor-Kueit dual-vortex photocatalytic reactor (1), material inlet and outlet pipelines, and a cooling system. The Taylor-Couette dual-vortex photocatalytic reactor (1) includes a fixed cylinder (11), a rotating cylinder (12), a rotating shaft (14), a variable speed motor (15), and a light source. The fixed cylinder (11) is an annular cylinder with an inner and outer sidewalls and an upward opening. Its annular cavity is used to place the photocatalytic material and the rotating cylinder (12). The rotating cylinder (12) is a cylindrical structure with an downward opening. The inner diameter of the rotating cylinder (12) is between the inner and outer wall diameters of the fixed cylinder (11). The cylinder wall of the rotating cylinder (12) is inserted into the annular cavity of the fixed cylinder, dividing the annular cavity into two annular cavities connected at the bottom. The rotating shaft (14) is fixedly connected to the top of the rotating cylinder (12). The rotating shaft (14) is driven by the variable speed motor (15). The light source is set in the space enclosed by the inner wall of the fixed cylinder (11). The cooling system is an annular cylindrical cooling cavity disposed between the inner wall of the fixed cylinder (11) and the light source, and the cooling system is arranged around the light source; the upper and lower parts of the outer wall of the fixed cylinder (11) are respectively provided with a material inlet (113) and a material outlet (110) connected to the material inlet and outlet pipelines; the annular cylindrical cooling cavity is integral with the fixed cylinder (11), and the two share the inner wall of the fixed cylinder (11); the lower and upper parts of the cylindrical cooling cavity are respectively provided with cooling water inlet and outlet pipelines; The fixed cylinder (11), rotating cylinder (12) and cooling system are all made of transparent material; The rotating shaft (14) is a detachable shaft, and the length of the rotating drum (12) extending into the fixed drum (11) can be adjusted by replacing the rotating shaft (14) with one of different lengths.

2. The dual-vortex photocatalytic device according to claim 1, wherein The central axes of the fixed cylinder (11) and the rotating cylinder (12) coincide.

3. The dual-vortex photocatalytic device according to claim 1, wherein The material inlet (113) is not higher than the inner wall of the fixed cylinder (11) and is connected to the sewage tank (3); the material outlet (110) is located on the side opposite to the material inlet (113) and is connected to the water purification tank (5).

4. The dual-vortex photocatalytic device of claim 1, wherein, The light source is a xenon lamp (16), and the central axis of the xenon lamp (16) and the fixed cylinder (11) coincide; the xenon lamp (16) is connected to an adjustable power supply (17).

5. The dual-vortex photocatalytic device of claim 1, wherein, The Taylor-Kueit dual-vortex photocatalytic reactor (1) is placed inside a cylindrical support (19) with a cover plate (18).

6. The dual-vortex photocatalytic device of claim 1, wherein, A feed pump (4) and a feed valve (6) are provided between the material inlet (113) and the sewage tank (3), and a discharge valve (9) is provided between the material outlet (110) and the clean water tank (5). A water inlet valve (8) is provided at the cooling system inlet (111), and a water outlet valve (7) is provided at the cooling water outlet (112).

7. The dual-vortex photocatalytic device according to claim 1, characterized in that, A filter screen is added at the material outlet (110).

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