An apparatus for testing the performance of a VOCs photodegradation catalyst

Abstract

This invention provides an apparatus for testing the performance of VOCs photodegradation catalysts, relating to VOCs treatment technology for waste gas. By placing photocatalyst plates in different photocatalyst placement slots, coating the photocatalyst plates with photocatalysts of different thicknesses, and changing the type and power of the lamps, the apparatus can test the effects of the distance between the light source and the photocatalyst plate, the thickness of the catalyst coating, the type of light source, and the power of the lamps on the performance of the photocatalyst in degrading VOCs, providing a theoretical basis for the industrial application of VOCs photodegradation catalysts.

Description

Technical Field

[0001] This invention belongs to the field of VOCs treatment technology, and in particular relates to a device for testing the performance of VOCs photodegradation catalysts. Background Technology

[0002] Volatile organic compounds (VOCs) are important precursors to secondary pollutants such as fine particulate matter (PM2.5) and ozone (O3), which in turn cause atmospheric environmental problems such as haze and photochemical smog. VOCs themselves have a significant impact on the human body. When the concentration of VOCs in the room reaches a certain level, people may experience headaches, nausea, and fatigue in a short period of time. In severe cases, they may cause convulsions, coma, and damage to the liver, brain, and nervous system, resulting in serious consequences such as memory loss. Volatile VOCs also irritate the eyes and respiratory tract, cause sore throat and fatigue, and contain many carcinogens. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a device capable of testing the effects of the distance between the light source and the photocatalyst plate, the thickness of the catalyst coating, the type of light source, and the power of the electric light on the performance of the photocatalyst in degrading VOCs, thus providing a theoretical basis for the industrial application of VOCs photodegradation catalysts.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a device for testing the performance of VOCs photodegradation catalysts, comprising an inlet pipe, an inlet cover plate, a reactor body, an outlet cover plate, and an outlet pipe connected in sequence. One end of the inlet pipe is a waste gas inlet, and one end of the outlet pipe is a waste gas outlet. A lamp and a photocatalyst plate coated with a photocatalyst are installed inside the reactor body. VOCs waste gas enters from the waste gas inlet of the inlet pipe, passes through the inlet cover plate, enters the reactor body, undergoes a photocatalytic reaction inside the reactor body, and then passes through the outlet cover plate, finally exiting from the waste gas outlet of the outlet pipe.

[0005] Furthermore, the inner walls of the inlet pipe, inlet cover plate, reactor body, outlet cover plate, and outlet pipe are covered with reflective film to prevent light leakage.

[0006] Furthermore, the inlet and outlet of the reactor body are provided with several photocatalyst plate placement racks placed at intervals, and there is a photocatalyst placement slit between two adjacent photocatalyst plate placement racks, in which the photocatalyst plates are placed.

[0007] The photocatalyst plate is coated with a photocatalyst of a certain thickness, which can be adjusted. The thickness of the photocatalyst placement slit matches the thickness of the photocatalyst plate.

[0008] Furthermore, a lamp holder is provided at the inlet and outlet of the reactor body, and a through hole is provided on the lamp holder, into which the lamp is inserted and placed.

[0009] The distance between the photocatalyst plate and the lamp tube can be adjusted by placing the photocatalyst plate in different photocatalyst placement slots.

[0010] Furthermore, sealing strips are provided in the inlet cover and the outlet cover to limit the flow cross-section of VOCs waste gas and prevent some VOCs waste gas from leaking to the back of the photocatalyst plate and not undergoing photodegradation reaction.

[0011] Furthermore, the inlet pipe is equipped with a waste gas inlet sampling port, which is connected to a gas phase analyzer to analyze the VOCs concentration of the inlet waste gas.

[0012] Furthermore, the outlet pipe is equipped with a waste gas outlet sampling port, which is connected to a gas phase analyzer to analyze the VOCs concentration in the waste gas after photocatalyst degradation.

[0013] Furthermore, flanges are provided on the outer periphery of the inlet cover plate, the outlet cover plate, and the inlet and outlet of the reactor body. The inlet cover plate, the outlet cover plate, and the reactor body are detachably connected by the flanges, which facilitates the disassembly and assembly of the photocatalyst plate and lamp tube in the reactor body.

[0014] Furthermore, the outlet cover is provided with a wire extraction hole, through which the power cord of the lamp tube is led out and connected to the power source.

[0015] Furthermore, the lamp tube can be an arc lamp, incandescent lamp, fluorescent lamp, or laser lamp, and the type and power of the lamp tube can be adjusted.

[0016] Beneficial effects:

[0017] This invention provides an apparatus for testing the performance of VOCs photodegradation catalysts. By placing the photocatalyst plate in different photocatalyst placement slots, the distance between the photocatalyst plate and the lamp tube can be adjusted. Photocatalysts of different thicknesses can be coated on the photocatalyst plate. By changing the type of lamp tube and adjusting the power of the lamp tube, the effects of the distance between the light source and the photocatalyst plate, the thickness of the catalyst coating, the type of light source, and the power of the lamp tube on the performance of the photocatalyst in degrading VOCs can be tested, providing a theoretical basis for the industrial application of VOCs photodegradation catalysts.

[0018] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device structure for testing the performance of VOCs photodegradation catalysts provided by the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the sectional view along the central AA direction;

[0021] Figure 3 Schematic diagram showing the photocatalyst plate placed at different distances from the lamp tube;

[0022] Figure 4 This is a schematic diagram of the sealing strip.

[0023] Figure label:

[0024] 1. Inlet pipe; 1-1. Exhaust gas inlet; 1-2. Exhaust gas inlet sampling port; 2. Inlet cover plate; 2-1. Inlet bolts and nuts fasteners; 2-2. Inlet sealing strip; 2-3. Inlet self-tapping screw; 3. Reactor body; 3-1. Photocatalyst plate placement rack; 3-2. Photocatalyst placement slot; 3-3. Lamp tube shelf; 3-4. Photocatalyst plate; 3-5. Lamp tube; 4. Outlet cover plate; 4-1. Outlet bolts and nuts fasteners; 4-2. Outlet sealing strip; 4-3. Outlet self-tapping screw; 4-4. Wire extraction hole; 5. Outlet pipe; 5-1. Exhaust gas outlet; 5-2. Exhaust gas outlet sampling port. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0026] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0027] Example:

[0028] like Figures 1-4As shown, in a preferred embodiment, the present invention provides an apparatus for testing the performance of VOCs photodegradation catalysts, comprising an inlet pipe 1, an inlet cover plate 2, a reactor body 3, an outlet cover plate 4, and an outlet pipe 5 connected in sequence. One end of the inlet pipe 1 is a waste gas inlet 1-1, and one end of the outlet pipe 5 is a waste gas outlet 5-1. A lamp tube 3-5 and a photocatalyst plate 3-4 coated with a photocatalyst are installed inside the reactor body 3. Waste gas containing VOCs enters from the waste gas inlet 1-1 of the inlet pipe 1, passes through the inlet cover plate 2, enters the reactor body 3, undergoes a photocatalytic reaction inside the reactor body 3, and then passes through the outlet cover plate 4 and finally exits from the waste gas outlet 5-1 of the outlet pipe 5.

[0029] To maximize the use of the light source and prevent the light emitted by the lamps from leaking out of the equipment, a thin layer of reflective film is attached to the inner walls of the inlet pipe 1, inlet cover plate 2, reactor body 3, outlet cover plate 4, and outlet pipe 5.

[0030] The reactor body 3 has a rectangular cross-section. Several photocatalyst plate placement racks 3-1 are placed at intervals at the inlet and outlet of the reactor body 3. There are at least eight photocatalyst plate placement racks. There is a photocatalyst placement slot 3-2 between two adjacent photocatalyst plate placement racks 3-1. The photocatalyst plates 3-4 are placed in the photocatalyst placement slots 3-2 at the inlet and outlet of the reactor body 3. The photocatalyst plates are made of carbon steel or stainless steel. A photocatalyst plate is set above and below the lamp tube.

[0031] The side of the photocatalyst plate 3-4 that is illuminated by the light source is coated with a photocatalyst of a certain thickness. The thickness can be adjusted, and the thickness of the photocatalyst placement slit 3-2 matches the thickness of the photocatalyst plate 3-4.

[0032] The reactor body 3 is equipped with a lamp holder 3-3 at the inlet and outlet. The lamp holder 3-3 has a through hole. The size of the hole needs to be adjusted according to the diameter of the lamp 3-5. The lamp 3-5 is inserted into the through hole on the lamp holder 3-3 and is located at the center of the reactor body 3.

[0033] The energy of light decreases with distance. To test the effect of the distance between the lamp tube 3-5 and the photocatalyst plate 3-4 on the VOCs degradation performance of the photocatalyst, multiple photocatalyst plate placement racks 3-1 were installed at the inlet and outlet of the reactor body 3. Photocatalyst placement slots 3-2 were reserved between the photocatalyst plate placement racks 3-1, and the thickness of the photocatalyst placement slots 3-2 matched the thickness of the photocatalyst plate 3-4. Figure 3 As shown, the distance between the center of the photocatalyst placement slit 3-2 and the center of the lamp tube 3-5 is controlled at 6cm, 9cm, 12cm, and 15cm.

[0034] When the distance between the center of the photocatalyst placement slot 3-2 and the center of the lamp tube 3-5 is 15cm, i.e., when the photocatalyst plate is located at the top or bottom of the reactor body 3, no sealing strip is required. When testing other distances, inlet sealing strip 2-2 and outlet sealing strip 4-2 need to be added to the inlet cover plate 2 and outlet cover plate 4 to limit the flow cross-section of VOCs waste gas and prevent some VOCs waste gas from leaking to the back of the photocatalyst plate and not undergoing photodegradation reaction. Inlet sealing strip 2-2 and outlet sealing strip 4-2 are fixed to the photocatalyst plate placement rack 3-1 using inlet self-tapping screws 2-3 and outlet self-tapping screws 4-3.

[0035] The inlet pipe 1 is equipped with a waste gas inlet sampling port 1-2, which is connected to a gas phase analyzer to analyze the VOCs concentration of the inlet waste gas.

[0036] The diameter of inlet pipe 1 is adjusted according to the amount of exhaust gas. The diameter of exhaust gas inlet sampling port 1-2 is 8mm. A small amount of exhaust gas is extracted from exhaust gas inlet sampling port 1-2 for analysis by the gas chromatograph.

[0037] The outlet pipe 5 is equipped with a waste gas outlet sampling port 5-2, which is connected to a gas phase analyzer to analyze the VOCs concentration in the waste gas after photocatalyst degradation.

[0038] Because the inlet and outlet gas volumes change little, the outlet pipe 5 has the same diameter as the inlet pipe 1. The exhaust gas outlet sampling port 5-2 has an opening diameter of 8mm. The VOCs exhaust gas after photocatalytic degradation is extracted from the exhaust gas outlet sampling port 5-2 for analysis. The inlet pipe 1 and outlet pipe 5 are made of UPVC material.

[0039] Flanges are provided on the outer periphery of the inlet cover plate 2, the outlet cover plate 4, and the reactor body 3. The inlet cover plate 2 and the outlet cover plate 4 are detachably connected to the reactor body 3 via the flanges. Specifically, the inlet cover plate 2 and the outlet cover plate 4 are connected to the reactor body 3 via inlet bolts and nuts fasteners 2-1 and 4-1 respectively, facilitating the disassembly and assembly of the photocatalyst plate 3-4 and the lamp tube 3-5 in the reactor body 3.

[0040] The outlet cover plate 4 has an electric wire pull-out hole 4-4, through which the power cord of the lamp tube 3-5 is led out and connected to the power source.

[0041] The performance of photocatalysts in degrading VOCs is related to the type of light source and the light energy. It is necessary to select a light source with good photocatalyst degradation performance. The reactor body 3 is equipped with lamps 3-5. The lamps can be one of arc lamps, incandescent lamps, fluorescent lamps and laser lamps. In addition, the lamps need to be input with a certain amount of electrical power to control their light energy.

[0042] Finally, it should be noted that the present invention is not limited to the above embodiments. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the protection scope of the present invention patent.

Claims

1. An apparatus for testing the performance of VOCs photodegradation catalysts, characterized in that, The reactor comprises an inlet pipe (1), an inlet cover plate (2), a reactor body (3), an outlet cover plate (4), and an outlet pipe (5) connected in sequence. One end of the inlet pipe (1) is a waste gas inlet (1-1), and one end of the outlet pipe (5) is a waste gas outlet (5-1). The reactor body (3) is equipped with lamps (3-5) and a photocatalyst plate (3-4) coated with a photocatalyst. VOCs waste gas enters from the waste gas inlet (1-1) of the inlet pipe (1), passes through the inlet cover plate (2), and enters the reactor body (3). A photocatalytic reaction occurs within the reactor body (3), and then the waste gas is discharged through the outlet pipe (5-1). The outlet cover (4) is used to discharge the waste gas from the outlet pipe (5) outlet (5-1); the inlet and outlet of the reactor body (3) are provided with several photocatalyst plate placement racks (3-1) placed at intervals, and there is a photocatalyst placement slit (3-2) between two adjacent photocatalyst plate placement racks (3-1), and the photocatalyst plate (3-4) is placed in the photocatalyst placement slit (3-2); the inlet cover (2) and the outlet cover (4) are provided with sealing strips to limit the flow cross section of VOCs waste gas and prevent some VOCs waste gas from leaking to the back of the photocatalyst plate and not undergoing photodegradation reaction.

2. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The inner walls of the inlet pipe (1), inlet cover plate (2), reactor body (3), outlet cover plate (4) and outlet pipe (5) are covered with reflective film.

3. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The reactor body (3) is provided with a lamp holder (3-3) at the inlet and outlet. The lamp holder (3-3) has a through hole, and the lamp (3-5) is inserted into the through hole on the lamp holder (3-3).

4. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The inlet pipe (1) is provided with a waste gas inlet sampling port (1-2), which is connected to a gas phase analyzer.

5. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The outlet pipe (5) is provided with a waste gas outlet sampling port (5-2), which is connected to a gas phase analyzer.

6. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The inlet cover plate (2), the outlet cover plate (4), and the reactor body (3) are provided with flanges on their outer periphery. The inlet cover plate (2), the outlet cover plate (4), and the reactor body (3) are detachably connected by the flanges.

7. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The outlet cover plate (4) is provided with a wire extraction hole (4-4), and the power cord of the lamp tube (3-5) is led out through the wire extraction hole (4-4) and connected to the power source.

8. The apparatus for testing the performance of VOCs photodegradation catalysts as described in claim 1, characterized in that, The lamps (3-5) are arc lamps, incandescent lamps, fluorescent lamps, or laser lamps.

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